Pressurized fuel system for an engine and method of operating a pressurized fuel system for an engine
阅读说明:本技术 用于发动机的加压燃料系统以及操作用于发动机的加压燃料系统的方法 (Pressurized fuel system for an engine and method of operating a pressurized fuel system for an engine ) 是由 戴尔·胡佛 于 2017-08-28 设计创作,主要内容包括:一种用于发动机的加压燃料喷射系统,包括:压力传感器,该压力传感器在低压轨中;电子压力调节器阀,该电子压力调节器阀与低压轨流体连通并处于低压轨的下游,并且该电子压力调节器阀与燃料供应源流体连通并处于燃料供应源的上游;以及控制器,该控制器被配置成从压力传感器接收压力信号并响应于该压力信号来控制电子压力调节器阀,以在低压轨中维持目标压力。(A pressurized fuel injection system for an engine, comprising: a pressure sensor in the low pressure rail; an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply; and a controller configured to receive the pressure signal from the pressure sensor and to control the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.)
1. A pressurized fuel injection system for an engine, comprising:
a fuel supply source;
a high pressure rail in fluid communication with and downstream of the fuel supply;
at least one injector arrangement in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into a cylinder of the engine;
a low pressure rail in fluid communication with and downstream of the at least one injector device and in fluid communication with and upstream of the fuel supply;
a pressure sensor in the low pressure rail;
an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply; and
a controller configured to receive a pressure signal from the pressure sensor and to control the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.
2. The pressurized fuel injection system of claim 1, wherein said at least one injector device includes at least one valve disposed between said high pressure rail and said low pressure rail.
3. The pressurized fuel injection system of claim 1, including a plurality of injector devices, each of the plurality of injector devices being in fluid communication with and downstream of the high pressure rail, each injector device being arranged to inject fuel into a respective cylinder of the engine and being in fluid communication with and upstream of the low pressure rail.
4. The pressurized fuel injection system of claim 3, wherein each injector arrangement includes at least one valve disposed between the high-pressure rail and the low-pressure rail.
5. The pressurized fuel injection system of claim 1 wherein said controller is configured to provide a first current level to said electronic pressure regulator valve, said first current level established to achieve said target pressure in said low pressure rail.
6. The pressurized fuel injection system of claim 5, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is below the target pressure, the controller provides a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a current position of the electronic pressure regulator valve toward a fully closed position to restore the pressure in the low pressure rail to the target pressure.
7. The pressurized fuel injection system of claim 6, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is above the target pressure, the controller provides another current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully open position to restore the pressure in the low pressure rail to the target pressure.
8. The pressurized fuel injection system of claim 5, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is above the target pressure, the controller provides a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully open position to restore the pressure in the low pressure rail to the target pressure.
9. A pressurised fuel injection system as claimed in claim 4, wherein the at least one valve of each injector device is electronically controllable by the controller, and wherein the controller is controllable to close the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device.
10. The pressurized fuel injection system of claim 1 wherein the controller is configured to control the electronic pressure regulator valve to maintain a first target pressure in the low pressure rail during a first operating condition and to maintain a second target pressure in the low pressure rail during a second operating condition.
11. The pressurized fuel injection system of claim 10, wherein the first operating condition is during a start of the engine and the second operating condition is during normal operation of the engine, and wherein the first target pressure is a lower pressure than the second target pressure.
12. A method of operating a pressurized fuel injection system for an engine, the system comprising: a fuel supply source; a high pressure rail in fluid communication with and downstream of the fuel supply; at least one injector arrangement in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into a cylinder of the engine; a low pressure rail in fluid communication with and downstream of the at least one injector device and in fluid communication with and upstream of the fuel supply; a pressure sensor in the low pressure rail; and an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply source, the method comprising:
monitoring a pressure in the low pressure rail by the pressure sensor and sending a pressure signal corresponding to the monitored pressure from the pressure sensor to a controller; and
controlling the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.
13. The method of claim 12, comprising: providing a first current level to the electronic pressure regulator valve to achieve the target pressure in the low pressure rail.
14. The method of claim 13, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is below the target pressure; and, when it is detected that the pressure in the low pressure rail is below the target pressure, providing a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully closed position.
15. The method of claim 14, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is higher than the target pressure; and, when it is detected that the pressure in the low pressure rail is above the target pressure, providing another current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from its present position toward a fully open position.
16. The method of claim 13, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is higher than the target pressure; and, when it is detected that the pressure in the low pressure rail is above the target pressure, providing a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully open position.
17. The method of claim 13, wherein the system includes a plurality of injector devices, each of the plurality of injector devices being in fluid communication with the high pressure rail and downstream of the high pressure rail, each injector device being arranged to inject fuel into a respective cylinder of the engine and being in fluid communication with the low pressure rail and upstream of the low pressure rail, the method comprising:
detecting whether a pressure in the low pressure rail is different from the target pressure during monitoring of the pressure,
providing a current different than the first current level to the electronic pressure regulator valve to move the electronic pressure regulator valve from a present position to a different position to adjust the pressure in the low pressure rail toward the target pressure when it is detected that the pressure in the low pressure rail is different from the target pressure,
detecting whether the different current provided to the electronic pressure regulator valve is outside a predetermined range, an
Initiating a diagnostic process to identify a defective injector device of the plurality of injector devices when the different current provided to the electronic pressure regulator valve is detected to be outside of the predetermined range.
18. The method of claim 12, wherein the system includes a plurality of injector devices, each of the plurality of injector devices being in fluid communication with the high pressure rail and downstream of the high pressure rail, each injector device being arranged to inject fuel into a respective cylinder of the engine and being in fluid communication with the low pressure rail and upstream of the low pressure rail, each injector device including at least one valve disposed between the high pressure rail and the low pressure rail, the at least one valve of each injector device being electronically controllable by the controller, and wherein the controller is controllable to close the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device, the method comprises the following steps:
detecting whether a pressure in the low pressure rail is lower than the target pressure during monitoring of the pressure,
closing the at least one valve of each of the plurality of injector devices one after the other when it is detected that the pressure in the low pressure rail is different from the target pressure, an
Identifying a faulty injector device by: a pressure in the low pressure rail different from a pressure in the low pressure rail detected when the at least one valve of one of the plurality of injector devices is closed is detected when the at least one valve of any other of the plurality of injector devices is closed.
19. The method of claim 18, comprising identifying a leaking injector device of the plurality of injector devices by: a lower pressure is detected in the low pressure rail when the at least one valve of the leaking one of the plurality of injector devices is closed than a pressure in the low pressure rail detected when the at least one valve of any other one of the plurality of injector devices is closed.
20. The method of claim 18, comprising identifying injector devices of the plurality of injector devices that are stuck closed by: detecting a higher pressure in the low pressure rail when the at least one valve of the stuck closed injector device of the plurality of injector devices is closed than a pressure in the low pressure rail detected when the at least one valve of any other injector device of the plurality of injector devices is closed.
21. The method of claim 12, comprising: controlling the electronic pressure regulator valve to maintain a first target pressure in the low pressure rail during a first operating condition and to maintain a second target pressure in the low pressure rail during a second operating condition.
22. The method of claim 12, wherein the system includes a plurality of injector devices, each of the plurality of injector devices being in fluid communication with the high pressure rail and downstream of the high pressure rail, each injector device being arranged to inject fuel into a respective cylinder of the engine and being in fluid communication with the low pressure rail and upstream of the low pressure rail, each injector device including at least one valve disposed between the high pressure rail and the low pressure rail, the at least one valve of each injector device being electronically controllable by the controller, and wherein the controller is controllable to close the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device, the method comprises the following steps: electronically controlling the at least one valve of each injector device via the controller; and, closing, via the controller, the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device.
Technical Field
The present disclosure relates generally to pressurized fuel systems for engines and, more particularly, to such fuel systems having pressure regulation in the low pressure rail.
Background
A typical pressurized fuel injection system for an engine includes: a fuel supply source; a high pressure rail in fluid communication with and downstream of the fuel supply; at least one injector arrangement in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into a cylinder of the engine; and a low pressure rail in fluid communication with and downstream of the at least one injector device and in fluid communication with and upstream of the fuel supply. For the purpose of maintaining a desired pressure in the low pressure rail, a pressure regulator valve is provided that is in fluid communication with the low pressure rail and downstream of the low pressure rail, and in fluid communication with the fuel supply and upstream of the fuel supply.
In a high pressure common rail direct injection liquid fuel system, a high pressure pump supplies fuel to a high pressure rail so that the fuel will be appropriately pressurized for injection into the cylinders of the engine. Fuel from the high pressure rail is supplied to each individual injector, and excess fuel in any injector that is not injected into the cylinder associated with that injector is returned to the low pressure rail. Excess fuel is typically used to keep the injector cool to maintain the fuel in a liquid state at a given operating pressure. The low pressure rail returns fuel to an inlet on the high pressure pump or to a fuel tank. The low pressure rail provides a path or circuit so that the internal flow path of the injector and related components is not over pressurized and provides an appropriate feedback pressure to the injector so that the internal valves of the injector work properly.
In the case of fuels with low vapor pressure, the back pressure from the low pressure rail also maintains the fuel in its liquid phase at the proper operating pressure. Without this back pressure, the fuel would change to a gaseous phase at the high temperatures seen in the injector.
In existing fuel systems, the back pressure in the low pressure rail is controlled by a mechanical pressure relief valve or a regulator valve upstream of the fuel tank. The mechanical regulating valve is spring controlled or vacuum controlled.
There are several disadvantages to using a mechanical regulator valve in a high pressure common rail direct injection liquid fuel system. One drawback is that mechanically regulated valves have a limited flow rate range and pressure range over which the valve will maintain its regulation. The spring controlled regulator valve has a single fixed pressure set point with a narrow operating window, while the vacuum controlled valve provides a somewhat larger range of pressure set points. The amount of fuel to be supplied to the injector varies for different engine operating conditions (e.g., at high speed and high load). For these different injector flows, the excess flow also varies proportionally. These regulator valves must be opened and closed an appropriate amount to maintain the correct back pressure. For a wide engine fuel flow range, one backpressure setting may not be optimal, but the mechanical control valves have little or no ability to adjust to the changing flow conditions.
Another disadvantage of mechanically regulated valves is that when one or more injectors begin to leak internally, they eventually provide excess fuel to the low pressure rail beyond what is expected. This excess flow typically results from valve seat leakage due to wear, damage or clogging or from the valve becoming stuck and partially open. In the event that the low pressure regulator valves present a flow greater than the flow they are designed to accommodate (accommate), the low pressure rail pressure increases due to the mechanical regulator valves not being able to open sufficiently to allow a greater flow through it.
A further disadvantage of mechanical regulating valves is seen when the engine of e.g. a truck is attempted to be started. Leaking injectors, high temperature and resistance conditions (vapor lock conditions) may cause the low rail pressure to rise during engine starting. If the low pressure rail pressure is too high when cranking the engine to start, the internal valves of the injector will not work properly and the injector will not be able to provide the correct amount of fuel to the cylinder to allow the engine to start. This disadvantage tends to manifest as a hard start or no start during engine cranking.
Yet another disadvantage of mechanical regulator valves is that they tend to experience excessive wear because they must open and close at a rate equal to one firing per cylinder. The injector causes fuel to flow in high pressure pulses to the low pressure rail as the injector valve opens and closes with each injection cycle into the high pressure rail.
When the pressure in the low pressure rail deviates excessively from the target pressure for a given operating condition, due to, for example, a faulty injector or a faulty regulator valve, the engine operates improperly and may be severely damaged. In some cases, the engine will not start or will be shut down. This is particularly disadvantageous for truck engines, as a malfunctioning truck may need to be towed to a service station to diagnose and resolve problems, for example, by replacing a malfunctioning injector or a malfunctioning regulator valve. Furthermore, diagnosing which of several injectors of an engine is malfunctioning is problematic because it is often necessary to disconnect each individual injector from the low pressure line to see if it leaks or gets stuck, which is time consuming and may result in fuel spray out of the injector.
It is desirable to provide a fuel system that allows the low pressure rail to operate over a wide range of pressures. It is also desirable to provide a fuel system that is capable of raising the pressure in the low pressure rail in the event that a pressure below the target pressure is detected. It is also desirable to provide a fuel system that is capable of reducing pressure in the low pressure rail in the event that a pressure above the target pressure is detected. It is also desirable to provide a fuel system that does not require a low pressure rail regulator valve that must be opened and closed quickly and frequently so that the life of the regulator valve can be extended. It is also desirable to provide a fuel system that is capable of restoring pressure to a target pressure in response to a pressure drop or rise in the low pressure rail. It is also desirable to provide a fuel system that facilitates identifying a source of a low or high pressure fault in the fuel system. It is also desirable to provide a fuel system that is capable of easily adjusting the pressure in the low pressure rail for different operating conditions.
Disclosure of Invention
According to one aspect of the present invention, a pressurized fuel injection system for an engine includes: a fuel supply source; a high pressure rail in fluid communication with and downstream of the fuel supply; at least one injector arrangement in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into a cylinder of the engine; a low pressure rail in fluid communication with and downstream of at least one injector device and in fluid communication with and upstream of a fuel supply; a pressure sensor in the low pressure rail; an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply; and a controller configured to receive the pressure signal from the pressure sensor and to control the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.
According to another aspect of the invention, there is provided a method of operating a pressurized fuel injection system for an engine, the system comprising: a fuel supply source; a high pressure rail in fluid communication with and downstream of a fuel supply; at least one injector arrangement in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into a cylinder of the engine; a low pressure rail in fluid communication with and downstream of the at least one injector device and in fluid communication with and upstream of a fuel supply; a pressure sensor in the low pressure rail; and an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail, and in fluid communication with and upstream of the fuel supply. The method comprises the following steps: monitoring a pressure in the low pressure rail by a pressure sensor and sending a pressure signal corresponding to the monitored pressure from the pressure sensor to a controller; and controlling an electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.
The fuel system and method according to aspects of the present disclosure can allow the low pressure rail to operate over a wide pressure range. The fuel system and method may also allow for facilitating raising the pressure in the low pressure rail in the event that a pressure below the target pressure is detected and/or lowering the pressure in the low pressure rail in the event that a pressure above the target pressure is detected. The fuel system and method can operate by a low pressure rail regulator valve that does not have to be mechanically opened and closed quickly and frequently, thereby enabling the life of the regulator valve to be extended. The fuel system and method may also allow for pressure to be restored to a target pressure in response to a pressure drop or increase in the low pressure rail. The fuel system and method can also facilitate identifying a source of low or high pressure faults in the fuel system. The fuel system and method can also facilitate easily adjusting the pressure in the low pressure rail for different operating conditions.
Drawings
The features and advantages of the present invention will be best understood by reading the following detailed description in conjunction with the accompanying drawings, in which like reference numerals identify like elements, and in which:
FIG. 1 is a schematic illustration of a pressurized fuel system for an engine according to one aspect of the present disclosure;
FIG. 2 is a schematic illustration of an injector arrangement for a pressurized fuel system according to an aspect of the present disclosure;
FIG. 3 is a graph illustrating pressure measurements in a low pressure rail of a pressurized fuel system according to one aspect of the present disclosure during normal engine operation (target pressure), leakage, and start-up conditions;
FIG. 4 is a diagram illustrating how a pressure measurement in the low pressure rail can be used to diagnose a leaking injector in a pressurized fuel system according to one aspect of the present disclosure;
FIG. 5 is a graph illustrating how pressure measurements in the low pressure rail can be used to diagnose a stuck injector in a pressurized fuel system according to one aspect of the present disclosure; and is
FIG. 6 is a graph illustrating how the current of an electronic pressure regulator valve of a pressurized fuel injection system according to one aspect of the present disclosure can be adjusted to open or close a normally open electronic pressure regulator valve to reduce or increase pressure in a low pressure rail.
Detailed Description
A pressurized
The
A
A
A controller 37 (which may be the ECU of the vehicle or any suitable controller) is configured to receive the pressure signal from the
Fig. 2 shows an
In the
The
When the needle control valve 51 is activated, the
To terminate injection, the
Fig. 3 graphically illustrates the pressure measurements in the
The use of the electronic
For various reasons, fuel may leak uncontrolled from the
By sensing the pressure in the
One possible source of the problem of a valve stuck open or closed (stuck open or closed) in many current injectors is
As shown in fig. 5, when
Diagnosis of a leaking injector may be accomplished by using a low voltage electronic regulator control signal (i.e., current that controls the position of the valve). Under normal conditions, the electronic low pressure fuel regulator is controlled to a given pressure set point by the
Once the diagnostics have determined that there is a faulty injector, the
As seen in fig. 4, when it is detected that the measured average pressure is higher than the target pressure, this typically means that there is a leak into the
As further shown in fig. 5, if it is detected that the measured average pressure is below the target pressure, this typically means that the flow through one of the
The electronic
In the method for operating the pressurized
As seen in fig. 6, typically, a first current level IP will be provided to the electronic
If the
The nature of the problem of the malfunctioning injector device can be further diagnosed. A leaking injector device of the plurality of
According to yet another aspect of the present disclosure, the electronic
In the present application, the use of terms such as "including" and the like is open-ended and is intended to have the same meaning as terms such as "comprising" and the like, and does not preclude the presence of other structure, material, or acts. Similarly, although the use of terms such as "can" or "may" is intended to be open-ended and to reflect that structure, material, or acts are not necessary, the failure to use such terms is not intended to reflect that structure, material, or acts are essential. If the structure, material, or acts are presently considered to be essential, they are identified as such.
While the invention has been illustrated and described in accordance with a preferred embodiment, it is recognized that variations and modifications can be made therein without departing from the invention as defined in the claims.
The claims (modification according to treaty clause 19)
1. A pressurized fuel injection system for an engine, comprising:
a fuel supply source;
a high pressure rail in fluid communication with and downstream of the fuel supply;
a plurality of injector devices in fluid communication with and downstream of the high pressure rail and arranged to inject fuel into cylinders of the engine;
a low pressure rail in fluid communication with and downstream of the plurality of injector devices, and in fluid communication with and upstream of the fuel supply;
a pressure sensor in the low pressure rail;
an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply;
a controller configured to:
receiving a pressure signal from the pressure sensor,
controlling the electronic pressure regulator valve by providing a first current level to the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail,
detecting whether a pressure in the low pressure rail is different from the target pressure during monitoring of the pressure,
providing a current different than the first current level to the electronic pressure regulator valve to move the electronic pressure regulator valve from a present position to a different position to adjust the pressure in the low pressure rail toward the target pressure when it is detected that the pressure in the low pressure rail is different from the target pressure,
detecting whether the different current provided to the electronic pressure regulator valve is outside a predetermined range, an
Initiating a diagnostic process to identify a defective injector device of the plurality of injector devices when the different current provided to the electronic pressure regulator valve is detected to be outside of the predetermined range.
2. The pressurized fuel injection system of claim 1, wherein each of the plurality of injector devices includes at least one valve disposed between the high-pressure rail and the low-pressure rail.
3. A pressurised fuel injection system as claimed in claim 2, wherein the at least one valve of each injector device is electronically controllable by the controller, and wherein the controller is controllable to close the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device.
4. The pressurized fuel injection system of claim 1, wherein the first current level is established to achieve the target pressure in the low pressure rail.
5. The pressurized fuel injection system of claim 4, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is below the target pressure, the controller provides a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a current position of the electronic pressure regulator valve toward a fully closed position to restore the pressure in the low pressure rail to the target pressure.
6. The pressurized fuel injection system of claim 5, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is above the target pressure, the controller provides another current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully open position to restore the pressure in the low pressure rail to the target pressure.
7. The pressurized fuel injection system of claim 4, wherein the controller is configured to: when the pressure signal indicates that the pressure in the low pressure rail is above the target pressure, the controller provides a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from a present position of the electronic pressure regulator valve toward a fully open position to restore the pressure in the low pressure rail to the target pressure.
8. The pressurized fuel injection system of claim 1 wherein the controller is configured to control the electronic pressure regulator valve to maintain a first target pressure in the low pressure rail during a first operating condition and to maintain a second target pressure in the low pressure rail during a second operating condition.
9. The pressurized fuel injection system of claim 8, wherein the first operating condition is during a start of the engine and the second operating condition is during normal operation of the engine, and wherein the first target pressure is a lower pressure than the second target pressure.
10. A method of operating a pressurized fuel injection system for an engine, the system comprising: a fuel supply source; a high pressure rail in fluid communication with and downstream of the fuel supply; a plurality of injector devices, each of the plurality of injector devices in fluid communication with and downstream of the high pressure rail, each injector device arranged to inject fuel into a respective cylinder of the engine; a low pressure rail in fluid communication with and downstream of the plurality of injector devices, and in fluid communication with and upstream of the fuel supply; a pressure sensor in the low pressure rail; and an electronic pressure regulator valve in fluid communication with and downstream of the low pressure rail and in fluid communication with and upstream of the fuel supply source, the method comprising:
monitoring a pressure in the low pressure rail by the pressure sensor and sending a pressure signal corresponding to the monitored pressure from the pressure sensor to a controller;
controlling the electronic pressure regulator valve to maintain a target pressure in the low pressure rail by providing a first current level to the electronic pressure regulator valve in response to the pressure signal;
during monitoring pressure, detecting whether pressure in the low pressure rail differs from the target pressure;
when it is detected that the pressure in the low pressure rail is different from the target pressure, providing a current different from the first current level to the electronic pressure regulator valve to move the electronic pressure regulator valve from a present position to a different position to adjust the pressure in the low pressure rail toward the target pressure;
detecting whether the different current provided to the electronic pressure regulator valve is outside a predetermined range; and
initiating a diagnostic process to identify a defective injector device of the plurality of injector devices when the different current provided to the electronic pressure regulator valve is detected to be outside of the predetermined range.
11. The method of claim 10, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is below the target pressure; and, when it is detected that the pressure in the low pressure rail is below the target pressure, providing a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from the current position of the electronic pressure regulator valve toward a fully closed position.
12. The method of claim 11, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is higher than the target pressure; and, when it is detected that the pressure in the low pressure rail is above the target pressure, providing another current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from the current position of the electronic pressure regulator valve toward a fully open position.
13. The method of claim 10, comprising: during monitoring pressure, detecting whether pressure in the low pressure rail is higher than the target pressure; and, when it is detected that the pressure in the low pressure rail is above the target pressure, providing a current to the electronic pressure regulator valve that is different from the first current level to move the electronic pressure regulator valve from the current position of the electronic pressure regulator valve toward a fully open position.
14. The method of claim 10, wherein the diagnostic process for identifying a defective injector device of the plurality of injector devices comprises:
closing the at least one valve of each of the plurality of injector devices one after the other when it is detected that the pressure in the low pressure rail is different from the target pressure, an
Identifying a faulty injector device by: a pressure in the low pressure rail different from a pressure in the low pressure rail detected when the at least one valve of one of the plurality of injector devices is closed is detected when the at least one valve of any other of the plurality of injector devices is closed.
15. The method of claim 14, comprising identifying a leaking injector device of the plurality of injector devices by: a lower pressure is detected in the low pressure rail when the at least one valve of the leaking one of the plurality of injector devices is closed than a pressure in the low pressure rail detected when the at least one valve of any other one of the plurality of injector devices is closed.
16. The method of claim 14, comprising identifying injector devices of the plurality of injector devices that are stuck closed by: detecting a higher pressure in the low pressure rail when the at least one valve of the stuck closed injector device of the plurality of injector devices is closed than a pressure in the low pressure rail detected when the at least one valve of any other injector device of the plurality of injector devices is closed.
17. The method of claim 10, comprising: controlling the electronic pressure regulator valve to maintain a first target pressure in the low pressure rail during a first operating condition and to maintain a second target pressure in the low pressure rail during a second operating condition.
18. The method of claim 10, wherein each of the plurality of injector devices includes at least one valve disposed between the high pressure rail and the low pressure rail, the at least one valve of each injector device being electronically controllable by the controller, and wherein the controller is controllable to close the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device, the method comprising: electronically controlling the at least one valve of each injector device via the controller; and, closing, via the controller, the at least one valve of one of the plurality of injector devices independently of the at least one valve of any other injector device.
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