Fuel pump pressure control structure and method
阅读说明:本技术 燃料泵压力控制结构与方法 (Fuel pump pressure control structure and method ) 是由 D·J·本森 P·佩夫勒 于 2017-10-24 设计创作,主要内容包括:提供了一种控制泵的方法和系统,该泵具有泵送元件,该泵送元件构造成将加压燃料提供给共轨蓄能器,该共轨蓄能器连接到多个燃料喷射器,所述多个燃料喷射器构造成将燃料喷射到发动机的相应的多个气缸中,包括:接收轨压值,该轨压值表示蓄能器中的当前燃料压力;并且通过控制泵送元件在泵送元件的每个潜在泵送事件期间的操作以在至少一些潜在泵送事件期间产生实际泵送事件来响应所接收的至少一个轨压值,从而使轨压值保持在期望的范围并且实现以下中的至少一项:提高泵的总效率、降低由泵产生的可听噪声、增加泵的可靠性以及减少多个燃料喷射器处的喷射压力变化。(A method and system are provided for controlling a pump having a pumping element configured to provide pressurized fuel to a common rail accumulator connected to a plurality of fuel injectors configured to inject fuel into a corresponding plurality of cylinders of an engine, comprising: receiving a rail pressure value, the rail pressure value representing a current fuel pressure in the accumulator; and responding to the received at least one rail pressure value by controlling operation of the pumping element during each potential pumping event of the pumping element to produce an actual pumping event during at least some potential pumping events, thereby maintaining the rail pressure value within a desired range and achieving at least one of: improving overall efficiency of the pump, reducing audible noise produced by the pump, increasing reliability of the pump, and reducing injection pressure variation at the plurality of fuel injectors.)
1. A method of controlling a pump having at least one pumping element configured to provide pressurized fuel to a common rail accumulator coupled to a plurality of fuel injectors configured to inject fuel into a corresponding plurality of cylinders of an engine, the method comprising:
receiving at least one rail pressure value representing a current fuel pressure in the common rail accumulator; and is
Responding to the received at least one rail pressure value by controlling operation of the at least one pumping element during each potential pumping event of the at least one pumping element to produce an actual pumping event during at least some potential pumping events, thereby maintaining the at least one rail pressure value within a desired range or achieving a desired pressure value and achieving at least one of: increasing an overall efficiency of the pump or the engine, reducing audible noise generated by the pump, increasing a reliability of the pump, and reducing injection pressure variation at the plurality of fuel injectors.
2. The method of claim 1, wherein the at least one pumping element comprises two pumping elements.
3. The method of claim 2, wherein the two pumping elements are configured to provide a ratio of potential pumping events to injection events of the plurality of fuel injectors of one of 1, 1.5, or 2.
4. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: actual pumping events of 100% fuel delivery or 0% fuel delivery are generated during each potential pumping event, thereby increasing the overall efficiency of the pump.
5. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery or 0% fuel delivery preferably phased relative to an injection event; and is
Generating an actual pumping event of 0% fuel delivery during all potential pumping events of another pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event,
thereby reducing audible noise generated by the pump or the engine.
6. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating actual pumping events of greater than 0% but less than 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping events of greater than 0% but less than 100% fuel delivery preferably phased relative to injection events; and is
Generating an actual pumping event of 0% fuel delivery during each potential pumping event of another pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event,
thereby reducing audible noise generated by the pump or the engine.
7. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event; and is
Generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during a potential pumping event of another pumping element, the actual pumping event of 100% fuel delivery or 0% fuel delivery not preferentially phased relative to the injection event,
thereby increasing the overall efficiency of the pump and reducing the audible noise of the pump or the engine.
8. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event; and is
Generating an actual pumping event of greater than 0% but less than 100% fuel delivery during each potential pumping event of the other pumping element, the actual pumping event of greater than 0% but less than 100% fuel delivery not preferentially phased relative to the injection event.
9. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event to deliver a quantity of fuel greater than the undesired fuel delivery percentage during one half of the potential pumping events of one pumping element, the actual pumping event preferably phased relative to the injection event;
generating an actual pumping event during the other half of the potential pumping events of the one pumping element to deliver an amount of fuel less than the undesired fuel delivery percentage, the actual pumping event preferably phased relative to the injection event; and is
Generating an actual pumping event of 0% fuel delivery during each potential pumping event of another pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event,
thereby increasing the reliability of the pump.
10. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event to deliver 0% fuel delivery or a quantity of fuel greater than an undesired fuel delivery percentage during each potential pumping event of one pumping element, the actual pumping event preferably phased relative to an injection event; and is
An actual pumping event is generated during each potential pumping event of the other pumping element to deliver 0% fuel delivery or a quantity of fuel greater than the percentage of undesired fuel delivery, the actual pumping event not being preferentially phased relative to the injection event.
11. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event during each potential pumping event of one pumping element to deliver 0% fuel delivery or a quantity of fuel greater than an undesired fuel delivery percentage, the actual pumping event preferably phased relative to an injection event; and is
An actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event.
12. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
actual pumping events that result in 100% fuel delivery during each potential pumping event of one pumping element; and is
An actual pumping event that results in greater than 0% but less than 100% fuel delivery during each potential pumping event of another pumping element.
13. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event during each potential pumping event of one pumping element to deliver a quantity of fuel greater than an undesirable fuel delivery percentage; and is
Generating an actual pumping event during each potential pumping event of another pumping element to deliver an amount of fuel less than the undesired fuel delivery percentage,
thereby increasing the reliability of the pump.
14. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
actual pumping events that result in 100% fuel delivery or 0% fuel delivery during each potential pumping event of one pumping element; and is
The actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element.
15. The method of claim 14, wherein the actual pumping event of 100% fuel delivery is preferentially phased relative to the injection event, thereby reducing audible noise of the pump or the engine.
16. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event;
generating actual pumping events of greater than 0% but less than 100% fuel delivery during each potential pumping event of the one pumping element, the actual pumping events of greater than 0% but less than 100% fuel delivery not preferentially phased relative to the injection events; and is
The actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element.
17. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises:
generating an actual pumping event during each potential pumping event of one pumping element to deliver a quantity of fuel less than or greater than the undesired fuel delivery percentage, the actual pumping event preferably phased relative to the injection event; and is
Generating an actual pumping event of 0% fuel delivery during each potential pumping event of the one pumping element and during each potential pumping event of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event.
18. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same at the beginning of each injection event.
19. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same during each injection event.
20. A method of controlling a fuel pump having a plurality of pumping elements, the method comprising:
determining at least one of a desired rail pressure range or a desired rail pressure value;
determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to achieve at least one of: maintaining rail pressure within or near the desired rail pressure range and increasing pump efficiency, reducing audible noise generated by the fuel pump, increasing pump reliability, or reducing rail pressure variation during a fuel injection event; and is
An actual pumping event is generated during each potential pumping event to deliver the determined amount of fuel.
21. The method of claim 20, wherein generating an actual pumping event comprises: actual pumping events of 100% fuel delivery or 0% fuel delivery are generated, thereby improving pump reliability.
22. The method of claim 20, wherein generating an actual pumping event comprises: actual pumping events are generated during potential pumping events that are preferably phased relative to injection events, thereby reducing pump audible noise.
23. The method of claim 20, wherein generating an actual pumping event comprises: the actual pumping event is generated to deliver a fuel quantity that is greater than or less than the undesirable fuel delivery percentage, thereby improving pump reliability.
24. The method of claim 20, wherein generating an actual pumping event comprises: the actual pumping event is generated to deliver an amount of fuel such that the rail pressure is substantially the same at the beginning of or during each injection event.
25. A fuel supply system, comprising:
a fuel pump including a plurality of pumping elements;
an accumulator coupled to the fuel pump;
a pressure sensor coupled to the accumulator, the pressure sensor configured to output a rail pressure value;
a plurality of fuel injectors coupled to the accumulator to receive pressurized fuel for delivery to an engine during an injection event; and
a controller coupled to the fuel pump, the pressure sensor, and the plurality of fuel injectors, the controller configured to:
determining a desired range of rail pressure values;
determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to maintain the rail pressure value within the desired range and increase fuel pump efficiency, reduce audible noise generated by the fuel pump, improve fuel pump reliability, or reduce rail pressure variation during fuel injection events; and is
An actual pumping event is generated during each potential pumping event to deliver the determined amount of fuel.
Technical Field
The present invention relates generally to fuel pumps and, more particularly, to fuel pump operation control methods.
Background
The fuel supply system, particularly one using a common rail accumulator, is typically controlled to maintain the fuel available to the fuel injectors within a desired pressure range. To this end, conventional control methods for fuel pumps receive feedback indicative of rail pressure and cause the pumping elements of the fuel pump to deliver a partial volume of fuel to the accumulator during each pumping cycle. However, when the fuel pump is operated below full capacity, it is inherently inefficient. Furthermore, in many system configurations, a percentage of the pumping cycles is not preferably phased in relation to the operation of the fuel injector. Thus, causing fuel delivery during each pumping cycle may result in increased audible noise, vibration, and harshness. Moreover, controlling pump operation only to rail pressure may include operating the pumping elements in areas that compromise reliability and durability and/or cause undesirable variability in rail pressure at or during a fuel injection event. Accordingly, it is desirable to provide a control method for a fuel supply system that addresses these and other shortcomings of conventional approaches.
Disclosure of Invention
According to one embodiment, the present disclosure provides a method of controlling a pump having at least one pumping element configured to provide pressurized fuel to a common rail accumulator coupled to a plurality of fuel injectors configured to inject fuel into a corresponding plurality of cylinders of an engine, the method comprising: receiving a rail pressure value indicative of a current fuel pressure in the accumulator; and responding to the received at least one rail pressure value by controlling operation of the at least one pumping element during each potential pumping event of the at least one pumping element to produce an actual pumping event during at least some potential pumping events to maintain the rail pressure value within a desired range or to achieve a desired pressure value and to achieve at least one of: improving overall pump efficiency, reducing audible noise generated by the pump or engine, improving pump reliability, and reducing injection pressure variation at the plurality of fuel injectors. In one aspect of this embodiment, the at least one pumping element comprises two pumping elements. In a variation of this aspect, the two pumping elements are configured to have a ratio of potential pumping events to injection events of the plurality of fuel injectors of one of 1X, 1.5X, or 2X. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: actual pumping events of 100% fuel delivery or 0% fuel delivery are generated during each potential pumping event, thereby increasing the overall efficiency of the pump. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery or 0% fuel delivery preferably phased relative to an injection event; and producing an actual pumping event of 0% fuel delivery during all potential pumping events of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event, thereby reducing audible noise produced by the pump or engine. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating actual pumping events of greater than 0% but less than 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping events of greater than 0% but less than 100% fuel delivery preferably phased relative to injection events; and producing an actual pumping event of 0% fuel delivery during each potential pumping event of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event, thereby reducing audible noise produced by the pump or the engine. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event; and generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during a potential pumping event of another pumping element, the actual pumping event of 100% fuel delivery or 0% fuel delivery not being preferentially phased relative to the injection event, thereby increasing the overall efficiency of the pump and reducing audible noise of the pump or the engine. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event; and producing greater than 0% but less than 100% actual pumping events of fuel delivery during each potential pumping event of the other pumping element, the greater than 0% but less than 100% actual pumping events of fuel delivery not preferentially phased relative to the injection events. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event to deliver a quantity of fuel greater than the undesired fuel delivery percentage during one half of the potential pumping events of one pumping element, the actual pumping event preferably phased relative to the injection event; generating an actual pumping event during the other half of the potential pumping events of the one pumping element to deliver an amount of fuel less than the undesired fuel delivery percentage, the actual pumping event preferably phased relative to the injection event; and generating an actual pumping event of 0% fuel delivery during each potential pumping event of another pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event, thereby increasing reliability of the pump. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event to deliver 0% fuel delivery or a quantity of fuel greater than an undesired fuel delivery percentage during each potential pumping event of one pumping element, the actual pumping event preferably phased relative to an injection event; and generating an actual pumping event during each potential pumping event of the other pumping element to deliver 0% fuel delivery or a fuel quantity greater than the undesired fuel delivery percentage, the actual pumping event not preferably phased relative to the injection event. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event during each potential pumping event of one pumping element to deliver 0% fuel delivery or a quantity of fuel greater than an undesired fuel delivery percentage, the actual pumping event preferably phased relative to an injection event; and generating an actual pumping event of 0% fuel delivery during each potential pumping event of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: actual pumping events that result in 100% fuel delivery during each potential pumping event of one pumping element; and an actual pumping event that results in greater than 0% but less than 100% fuel delivery during each potential pumping event of the other pumping element. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event during each potential pumping event of one pumping element to deliver a quantity of fuel greater than an undesirable fuel delivery percentage; and generating an actual pumping event during each potential pumping event of another pumping element to deliver an amount of fuel less than the undesired fuel delivery percentage, thereby improving the reliability of the pump. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: actual pumping events that result in 100% fuel delivery or 0% fuel delivery during each potential pumping event of one pumping element; and an actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element. In another feature of this variation, the actual pumping event of 100% fuel delivery is preferably phased relative to the injection event, thereby reducing audible noise of the pump or the engine. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event of 100% fuel delivery during each potential pumping event of one pumping element, the actual pumping event of 100% fuel delivery preferably phased relative to an injection event; generating actual pumping events of greater than 0% but less than 100% fuel delivery during each potential pumping event of the one pumping element, the actual pumping events of greater than 0% but less than 100% fuel delivery not preferentially phased relative to the injection events; and an actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: generating an actual pumping event during each potential pumping event of one pumping element to deliver a quantity of fuel less than or greater than the undesired fuel delivery percentage, the actual pumping event preferably phased relative to the injection event; and generating an actual pumping event of 0% fuel delivery during each potential pumping event of the one pumping element and during each potential pumping event of the other pumping element, the actual pumping event of 0% fuel delivery not being preferentially phased relative to the injection event. In yet another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same at the beginning of each injection event. In another variation, responding to the received at least one rail pressure value by controlling operation of the at least one pumping element comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same during each injection event.
Another embodiment of the present disclosure provides a method of controlling a fuel pump having a plurality of pumping elements, the method comprising determining at least one of a desired rail pressure range or a desired rail pressure value; determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to achieve at least one of: maintaining rail pressure within or near the desired rail pressure range and increasing pump efficiency, reducing audible noise generated by the fuel pump, increasing pump reliability, or reducing rail pressure variation during a fuel injection event; and generating an actual pumping event during each potential pumping event to deliver the determined amount of fuel. In one aspect of this embodiment, generating the actual pumping event comprises: actual pumping events of 100% fuel delivery or 0% fuel delivery are generated, thereby improving pump reliability. In another aspect, generating the actual pumping event comprises: actual pumping events are generated during potential pumping events that are preferably phased relative to injection events, thereby reducing pump audible noise. In yet another aspect, generating the actual pumping event comprises: the actual pumping event is generated to deliver a fuel quantity that is greater than or less than the undesirable fuel delivery percentage, thereby improving pump reliability. In yet another aspect, generating the actual pumping event comprises: the actual pumping event is generated to deliver an amount of fuel such that the rail pressure is substantially the same at the beginning of or during each injection event.
In another embodiment of the present disclosure, there is provided a fuel supply system including: a fuel pump including a plurality of pumping elements; an accumulator coupled to the fuel pump; a pressure sensor coupled to the accumulator, the pressure sensor configured to output a rail pressure value; a plurality of fuel injectors coupled to the accumulator to receive pressurized fuel for delivery to an engine during an injection event; and a controller coupled to the fuel pump, the pressure sensor, and the plurality of fuel injectors, the controller configured to: determining a desired range of rail pressure values; determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to maintain the rail pressure value within the desired range and increase fuel pump efficiency, reduce audible noise generated by the fuel pump, improve fuel pump reliability, or reduce rail pressure variation during fuel injection events; and generating an actual pumping event during each potential pumping event to deliver the determined amount of fuel.
While multiple embodiments are disclosed, other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
Drawings
The above mentioned and other features of this disclosure and the manner of attaining them will become more apparent and the disclosure itself will be better understood by reference to the following description of embodiments of the disclosure taken in conjunction with the accompanying drawings, wherein:
FIG. 1A is a conceptual diagram of a fuel supply system and an engine;
FIG. 1B is a cross-sectional side view of a pumping element of the fuel supply system of FIG. 1A;
fig. 2A is a typical efficiency map of a high-pressure fuel pump.
Fig. 2B-2C are tables providing an overview of the features of the systems and control methods depicted in fig. 3-31.
FIG. 3 is a graph of results of a prior art control method for a first pumping configuration.
4-12 are graphs of results of a control method according to the present disclosure used with the pumping arrangement of FIG. 3;
FIG. 13 is a graph of results of a prior art control method for a second pumping configuration.
14-16 are graphs of results of a control method according to the present disclosure used with the pumping arrangement of FIG. 13;
FIG. 17 is a graph of results of a prior art control method for a third pumping configuration.
18-30 are graphs of results of a control method according to the present disclosure used with the pumping arrangement of FIG. 17; and
FIG. 31 is a graph of the results of a control method according to the present disclosure used with the pumping configuration of FIG. 3.
While the disclosure is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and are described in detail below. However, the disclosure is not limited to the specific embodiments described. On the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the appended claims.
Detailed Description
One of ordinary skill in the art will recognize that the implementations provided may be implemented in hardware, software, firmware, and/or combinations thereof. For example, the controller disclosed herein may form part of a processing subsystem that includes one or more computing devices having memory, processing, and communication hardware. The controller may be a single device or a distributed device, and the functions of the controller may be performed by hardware and/or by processing instructions on a non-transitory computer readable storage medium. For example, computer instructions or programming code (e.g., an electronic control module ("ECM")) in the controller may be implemented in any feasible programming language, such as C, C + +, HTML, XTML, JAVA, or any other feasible high-level programming language, or a combination of high-level and low-level programming languages.
As used herein, the modifier "about" used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context (e.g., it includes at least the degree of error associated with measurement of the particular quantity). The modifier "about" when used in the context of a range is also to be construed as disclosing the range defined by the absolute values of the two endpoints. For example, a range of "about 2 to about 4" also discloses a range of "from 2 to 4".
Referring now to FIG. 1A, portions of a
The highly
FIG. 1B depicts one example of pumping
The reciprocating motion of the
All types of pumps have an efficiency curve that represents the energy efficiency of the pump versus the output of the pump. A typical efficiency curve for a high pressure fuel pump (e.g., pump 14 of fig. 1A) is depicted in fig. 2A. As shown, the pump achieves the highest overall efficiency (about 80%) when the delivered pumping capacity is equal to 100% of its pumping capacity. As is known in the art, there is always a fixed energy loss that prevents any pump from achieving 100% efficiency. As shown in fig. 2A, the overall efficiency of the pump decreases rapidly for pumping quantities below 40% and in particular below 20%. This exemplary curve simply provides an illustration of known principles: the fuel pump operates at higher efficiency when operating at its maximum pumping capacity. This principle is used to achieve more efficient pump operation in various control methods according to the present disclosure.
In a conventional fuel pump control approach, the
Additionally, in conventional
While the present disclosure does not affect the "over-design" margin required for the fuel pump, it does provide various control methods for various configurations of fuel pumps to achieve different pump operating goals, one of which is higher overall efficiency. More specifically, for pumps having different physical configurations and drive mechanisms (e.g., gears coupled to crankshaft 26), the control method of the present disclosure allows for tailoring pump operation to achieve higher efficiency, less audible noise, vibration, and harshness, higher pump reliability/life cycle more constant total accumulator fuel pressure and/or more constant fuel pressure during fuel injection. Depending on the operating conditions of the pump, a weighted or unweighted combination of these goals may be achieved.
The control method described above can be viewed as having one or more of the following four features: (1) binary pumping; (2) pumping in stages; (3) mild pumping; (4) pumping to minimize injection pressure variations. As described in more detail below, binary pumping refers to operating each pumping
Fig. 2B-2C provide an overview of features of the system and control method depicted in fig. 3-31. The embodiments of fig. 2B-2C are not exhaustive, but are provided to illustrate alternative control methods for different pumping configurations to achieve different goals. As shown in fig. 2B to 2C, fig. 3 to 12 and 31 depict the operation of the control method for a hardware configuration in which the pump has the possibility of pumping at twice the fuel injection frequency. Fig. 13 to 16 depict the operation of the control method, wherein the pump has the possibility of pumping at the injection frequency. 17-30 depict the operation of the control method, wherein pumping events do not occur at integer multiples of injection events. However, it should be understood that the pump-to-spray ratio may be any value and the present disclosure still contemplates. The second list of fig. 2B-2C characterizes whether the desired rail pressure can be provided by a
A prior art control method for a typical
As is evident from the foregoing description, FIG. 3 depicts the operation of a system having a 2 ratio between
As described above, the efficiency of the pump increases as the delivery amount of the pump increases. To increase the efficiency of the pump, a binary pumping method may be used. In binary pumping, the
Referring now to fig. 4, using a binary pumping method according to the present disclosure, the
However, as shown in FIG. 4, the
Referring now to FIG. 5, in this binary pumping control method, the
Referring now to fig. 6, in this control method, all
Referring now to FIG. 7, another control method is depicted that combines binary pumping (for efficiency improvement) and phase-controlled pumping (for audible noise, vibration, and harshness reduction). In this example, all
FIG. 8 depicts another control method that employs partial binary pumping and partial phased pumping. In this example, all
Referring now to fig. 9, another control method using partial phase-controlled pumping is shown. Fig. 9 to 12 all describe control methods that prioritize the avoidance of undesired delivery percentages. Unlike the method of fig. 8, in fig. 9,
The control method of fig. 10 is also designed for situations where a particular percentage of fuel delivery for each pumping event is considered undesirable. For some systems, the operating area of pumping
The control method of FIG. 11 is similar to the control method of FIG. 10, except that all of the
The control method of FIG. 12 is also similar to the control method of FIG. 10, except that all
Referring now to FIG. 13, a baseline prior art control method is shown for a system having a 1 ratio between
FIG. 14 depicts the results of a binary pumping control method according to the present disclosure, which is used with the 1 pumping injection ratio system of FIG. 13. As shown, each
Referring now to FIG. 15, a partial binary control method is used for systems where a
Referring now to FIG. 16, the results of the control method are shown, where gentle pumping is a control consideration. In this example, the reliability of the
Referring now to fig. 17, a prior art control method for a system is shown in which
FIG. 18 depicts the operation of a 1.5 pump-to-spray ratio system configuration using binary pumping according to the present invention. As shown, all
Referring now to FIG. 19, the operation of a 1.5 pump to spray ratio system is depicted using an alternative control method in accordance with the present invention. As shown, the control method employs binary pumping and maintains
The control method based on fig. 20 employs binary phased pumping in a 1.5 pump-to-spray ratio system, where one
The control method based on fig. 21 is similar to the control method of fig. 20, but the
The results of another variation of the control method for the 1.5 pump-to-spray ratio system are depicted in fig. 22. This control method is similar to the control method of fig. 21 in that it achieves a high priority for
The control method of fig. 23 is very similar to the control method of fig. 20. The only difference is that the
As with the control method of FIG. 10, the control method of FIG. 24 is designed for the case where a particular fuel delivery percentage for each pumping event is considered undesirable, but the method of FIG. 24 controls a 1.5 times pumping injection ratio system instead of a 2 times pumping injection ratio system. In this method,
In FIG. 25, the control method also avoids
The control method based on fig. 26 generates
Referring now to FIG. 27, the results of another control method that avoids
Fig. 28 depicts the results of a first example of a control method configured to implement pumping to minimize injection pressure variation (not binary pumping, phased pumping, or gentle pumping). Consistent injection pressures may be used to improve fuel economy and reduce undesirable emissions. As shown, using this control method,
Fig. 30 depicts the results of a control method configured to implement pumping according to a preferred phasing relationship, wherein
It should be understood that fig. 3-31 depict operation of the control methods during steady state engine operation, but these methods may also be employed during transient engine conditions. It should also be appreciated that a variety of control methods may be employed as desired in response to changes in engine operating requirements or other influences. As described above, in control methods that implement some combination of binary pumping, phased pumping, gentle pumping, or pumping to minimize injection pressure variation, the relative importance of the targets corresponding to these operating modes (e.g., efficiency, noise reduction, pump reliability, and injection pressure control) may be weighted to achieve a customized set of operating targets.
It should be understood that the connecting lines shown in the various figures contained herein are intended to represent exemplary functional relationships and/or physical couplings between the various elements. It should be noted that many alternative or additional functional relationships or physical connections may be present in a practical system. However, the benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or element. Thus, the scope is limited only by the claims that follow, wherein reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more. Furthermore, where a phrase similar to "at least one of a, B, or C" is used in a claim, it is intended that the phrase be interpreted to mean that a may be present alone in an embodiment, B may be present alone in an embodiment, C alone may be present in an embodiment, or any combination of elements a, B, or C may be present in a single embodiment; for example, A and B, A and C, B and C, or A and B and C.
In the detailed description herein, references to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described, given the benefit of this disclosure. After reading the specification, it will become apparent to one skilled in the relevant art how to implement the disclosure in alternative embodiments.
Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. Any claims herein should not be construed in accordance with the provisions of 35u.s.c 112(f), unless the element is explicitly recited using the phrase "means for …". As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Various modifications and additions may be made to the exemplary embodiments discussed without departing from the scope of the present invention. For example, although the embodiments described above refer to specific features, the scope of the present invention also includes embodiments having different combinations of features and embodiments that do not include all of the features described above. Accordingly, the scope of the present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the scope of the claims, and all equivalents thereof.
The claims (modification according to treaty clause 19)
1. A method of controlling a pump having a plurality of pumping elements including a first pumping element and a second pumping element, the plurality of pumping elements configured to provide pressurized fuel to a common rail accumulator coupled to a plurality of fuel injectors configured to inject fuel into a corresponding plurality of cylinders of an engine, the method comprising:
receiving at least one rail pressure value representing a current fuel pressure in the common rail accumulator; and is
Responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements during each potential pumping event of the plurality of pumping elements to produce an actual pumping event during at least some potential pumping events to maintain the at least one rail pressure value within a desired range or achieve a desired pressure value;
wherein each potential pumping event of the first pumping element occurs simultaneously with an injection event of the plurality of fuel injectors and each potential pumping event of the second pumping element does not occur simultaneously with an injection event of the plurality of fuel injectors.
2. The method of claim 1, wherein the first and second pumping elements are components of a single pump.
3. The method of claim 2, wherein the first and second pumping elements are each configured to provide a ratio of potential pumping events to injection events of the plurality of fuel injectors of one of 1, 1.5, or 2.
4. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises: actual pumping events of 100% fuel delivery or 0% fuel delivery are generated during each potential pumping event, thereby increasing the overall efficiency of the pump.
5. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during each potential pumping event of the first pumping element; and is
An actual pumping event of 0% fuel delivery is generated during all potential pumping events of the second pumping element,
thereby reducing audible noise generated by the pump or the engine.
6. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
actual pumping events that result in greater than 0% but less than 100% fuel delivery during each potential pumping event of the first pumping element; and is
An actual pumping event that results in 0% fuel delivery during each potential pumping event of the second pumping element,
thereby reducing audible noise generated by the pump or the engine.
7. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of the first pumping element; and is
Actual pumping events of 100% fuel delivery or 0% fuel delivery are generated during potential pumping events of the second pumping element,
thereby increasing the overall efficiency of the pump and reducing the audible noise of the pump or the engine.
8. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of the first pumping element; and is
Actual pumping events that result in greater than 0% but less than 100% fuel delivery during each potential pumping event of the second pumping element.
9. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event to deliver a quantity of fuel greater than an undesired fuel delivery percentage during half of the potential pumping events of the first pumping element;
generating an actual pumping event to deliver a quantity of fuel less than the undesired fuel delivery percentage during the other half of the potential pumping events of the first pumping element; and is
An actual pumping event that results in 0% fuel delivery during each potential pumping event of the second pumping element,
thereby increasing the reliability of the pump.
10. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event to deliver 0% fuel delivery or an amount of fuel greater than an undesired fuel delivery percentage during each potential pumping event of the first pumping element; and is
Generating an actual pumping event to deliver 0% fuel delivery or an amount of fuel greater than an undesired fuel delivery percentage during each potential pumping event of the second pumping element.
11. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event to deliver 0% fuel delivery or an amount of fuel greater than an undesirable fuel delivery percentage during each potential pumping event of the first pumping element; and is
An actual pumping event of 0% fuel delivery is generated during each potential pumping event of the second pumping element.
12. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of one of the first and second pumping elements; and is
An actual pumping event that results in greater than 0% but less than 100% fuel delivery during each potential pumping event of the other of the first and second pumping elements.
13. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event during each potential pumping event of one of the first and second pumping elements to deliver a quantity of fuel greater than an undesirable fuel delivery percentage; and is
Generating an actual pumping event during each potential pumping event of the other of the first and second pumping elements to deliver an amount of fuel that is less than the undesired fuel delivery percentage,
thereby increasing the reliability of the pump.
14. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery or 0% fuel delivery during each potential pumping event of one of the first and second pumping elements; and is
An actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other of the first and second pumping elements.
15. The method of
16. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event of 100% fuel delivery during each potential pumping event of the first pumping element;
actual pumping events that result in greater than 0% but less than 100% fuel delivery during each potential pumping event of the second pumping element; and is
The actual pumping event of 0% fuel delivery is generated during each potential pumping event of the other pumping element.
17. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises:
generating an actual pumping event to deliver an amount of fuel less than or greater than an undesired fuel delivery percentage during each potential pumping event of the first pumping element; and is
An actual pumping event of 0% fuel delivery is generated during each potential pumping event of the second pumping element and during each potential pumping event of another pumping element.
18. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same at the beginning of each injection event.
19. The method of claim 2, wherein responding to the received at least one rail pressure value by controlling operation of the plurality of pumping elements comprises: an actual pumping event is generated during each potential pumping event to deliver an amount of fuel to the accumulator such that the rail pressure is substantially the same during each injection event.
20. A method of controlling a fuel pump having a plurality of pumping elements, the method comprising:
determining at least one of a desired rail pressure range or a desired rail pressure value;
determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to achieve at least one of: maintaining rail pressure within or near the desired rail pressure range and increasing pump efficiency, reducing audible noise generated by the fuel pump, increasing pump reliability, or reducing rail pressure variation during a fuel injection event; and is
An actual pumping event is generated during each potential pumping event to deliver the determined amount of fuel.
21. The method of
22. The method of
23. The method of
24. The method of
25. A fuel supply system, comprising:
a fuel pump including a plurality of pumping elements;
an accumulator coupled to the fuel pump;
a pressure sensor coupled to the accumulator, the pressure sensor configured to output a rail pressure value;
a plurality of fuel injectors coupled to the accumulator to receive pressurized fuel for delivery to an engine during an injection event; and
a controller coupled to the fuel pump, the pressure sensor, and the plurality of fuel injectors, the controller configured to:
determining a desired range of rail pressure values;
determining an amount of fuel delivered during each potential pumping event corresponding to the plurality of pumping elements to maintain the rail pressure value within the desired range and increase fuel pump efficiency, reduce audible noise generated by the fuel pump, improve fuel pump reliability, or reduce rail pressure variation during fuel injection events; and is
An actual pumping event is generated during each potential pumping event to deliver the determined amount of fuel.
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