Engine control system and method for controlling activation of solenoid valve
阅读说明:本技术 用于控制螺线管阀的激活的发动机控制系统和方法 (Engine control system and method for controlling activation of solenoid valve ) 是由 D.埃茨勒 于 2019-07-17 设计创作,主要内容包括:公开了一种用于控制具有螺线管的阀的阀控制器和方法,包括:接收至少一个输入信号;检测至少一个信号的第一沿;以及响应于该检测结果来激活阀。激活阀包括在以下各阶段中激活阀:上升到峰值阶段,在该阶段期间阀被打开;在上升到峰值阶段之后的保持阶段,在该保持阶段期间阀保持打开并且阀的电流水平小于在上升到峰值阶段期间阀的电流水平;以及在保持阶段之后的激活结束阶段,在该激活结束阶段期间,阀中的电流纹波小于在保持阶段期间阀中的电流纹波。(A valve controller and method for controlling a valve having a solenoid is disclosed, comprising: receiving at least one input signal; detecting a first edge of at least one signal; and activating a valve in response to the detection result. Activating the valve includes activating the valve in the following stages: a rise to peak phase during which the valve is opened; a hold phase following the rise-to-peak phase during which the valve remains open and the current level of the valve is less than the current level of the valve during the rise-to-peak phase; and an activation end phase following the hold phase, during which the current ripple in the valve is smaller than during the hold phase.)
1. A valve controller configured to control a valve having a solenoid, the valve controller comprising:
a first input and at least one output for coupling to the valve, the valve controller configured to selectively activate the valve after receiving a first edge of a first signal at the first input, the valve activation comprising: a peak-up phase; followed by a hold phase, wherein a current level of the valve during the hold phase is less than a current level of the valve in the rise-to-peak phase; and an activation end phase following the hold phase, in which the current ripple of the valve is smaller than the current ripple of the valve in the hold phase.
2. The valve controller of claim 1, wherein the valve controller transitions activation of the valve from the hold phase to the activation-complete phase after receiving a second edge of the first input signal at the first input.
3. The valve controller of claim 2, wherein the duration of the activation termination phase is predetermined.
4. A valve controller according to claim 3, wherein the duration of the hold phase is greater than the duration of the activation end phase.
5. The valve controller of claim 2, wherein a first edge of the first signal is a negative edge and a second edge of the first signal is a positive edge following the negative edge.
6. The valve controller of claim 1, wherein the valve controller transitions activation of the valve from the hold phase to the activation-end phase in response to receiving a second edge of the first input signal at the first input.
7. A valve controller according to claim 1, wherein the valve comprises a fuel injector for a motor vehicle having a combustion engine, such that the valve controller controls the fuel injector.
8. The valve controller of claim 1, wherein the valve controller comprises an Application Specific Integrated Circuit (ASIC), the ASIC comprising at least one state machine that generates at least one output signal for receipt by the valve, the at least one output signal activating the valve in the peak-to-rise phase, the hold phase, and the end-of-activation phase.
9. The valve controller of claim 1, wherein a sloshing amount of the current valve is smaller than a sloshing amount of the current valve without the valve being activated in the activation end stage.
10. A method of controlling a valve having a solenoid, the method comprising:
receiving at least one input signal;
detecting a first edge of the at least one input signal; and
activating the valve in response to detecting a first edge of the at least one input signal, including activating the valve in stages that: a rise-to-peak phase during which the valve is opened; a hold phase following the rise-to-peak phase during which the valve remains open and a current level of the valve is less than a current level of the valve during the rise-to-peak phase; and an end-of-activation phase following the hold phase, during which the current ripple in the valve is smaller than during the hold phase.
11. The method of claim 10, further comprising: detecting a second edge of the at least one input signal, wherein activating the valve in the activation termination phase occurs in response to detecting the second edge of the at least one input signal.
12. The method of claim 11, wherein the first edge is a falling edge of the at least one input signal and a second edge of the at least one input signal is a rising edge of the at least one input signal, the second edge of the at least one input signal being a next edge of the at least one input signal after the first edge thereof.
13. The method of claim 10, further comprising: detecting a second edge of the at least one input signal, wherein activating the valve in the activation termination phase occurs after detecting the second edge of the at least one input signal.
14. The method of claim 10, wherein activating the valve in the activation termination phase occurs for a predetermined period of time.
15. The method of claim 14, wherein the predetermined period of time is fixed for the predetermined period of time in each instance in which the valve is activated.
16. The method of claim 10, wherein a duration of the hold phase is greater than a duration of the activation end phase.
17. The method of claim 10, wherein a duration of the activation end phase is greater than a duration of the hold phase.
Technical Field
Background
Solenoid actuators for (direct) injection valves and intake valves operate by controlling the current through their coils (which behave as resistive loads) according to a specified current profile. As an example, fig. 1 shows a typical current profile for activating a solenoid direct injection valve. The current profile includes various activation phases with different parameter definitions. All activation phases of the current curve are traversed sequentially based on time or current criteria until the end of the activation EOA has been reached. The current profile includes: a rise to
FIG. 2 illustrates the accuracy and repeatability of the endpoint with respect to activating an EOA. The term "accuracy" specifies the average delay between disabling the control signal NON and the resulting decay of the injector solenoid valve current. The term "repeatability" describes the time deviation (i.e., jitter) of the decay from the mean. Due to the systematic nature of the delay, this error can be compensated by adjusting the duration of the control signal NON. Since the wobble is random in nature, it cannot be compensated for. Instead, sloshing needs to be reduced or otherwise minimized by design.
The required fuel mass is varied by varying the activation time of the injectors depending on a set of external engine operating conditions, such as requested output torque and engine power or rail pressure. The main microcontroller controls the activation of the injectors with the help of the digital control signal NON. The injector will be activated using the specified current profile when the control signal is asserted (in this case, when the control signal NON transitions to a logic low state), and will be deactivated when the control signal is de-asserted (when the control signal NON transitions to a logic high state).
A significant part of the activation time tolerance is given by the delay and jitter of the final current phase at the end of the activation EOA. When the control signal NON fails (e.g., when the signal NON transitions from logic low to logic high), all NMOS switches of the power stage driving the injector solenoid are turned off, resulting in a rapidly decaying injector current. Due to the NON-ideal power level, there is a systematic delay between the rising edge of the control signal NON and the decay of the injector current. Furthermore, the inherent statistical variation in injector current levels at the moment of failure of the control signal from one activation to the next results in a variation (i.e. a jitter) in the temporal appearance of the current decay between injections (shot-to-shot). This means that the higher the current ripple during the regulated
Although all systematic errors (e.g., delays) may be compensated for by adjusting the duration of the control signal NON, the random statistical portion of the error (e.g., varying between injections) is not balanced. Thus, to reduce variation between injections, current ripple should be reduced or otherwise minimized. On the other hand, reducing the current ripple results in a higher switching frequency of the NMOS switch and thus in higher switching losses. For design reasons, there is a maximum limit to the power loss and thus to the reduction of the current ripple.
The injector valve may be controlled using a dedicated application specific integrated circuit ("ASIC"). Thus, the ASIC applies current to the injector solenoid according to the current curve definition based on instructions and commands received from an external processor.
Accordingly, it is desirable to present a system and method for efficiently controlling actuation of a solenoid injector valve. Furthermore, other desirable features and characteristics will become apparent from the subsequent summary and the detailed description, and the appended claims, taken in conjunction with the accompanying drawings and this background.
Disclosure of Invention
The exemplary embodiments overcome the deficiencies in prior control devices for solenoid injector valves. In an example embodiment, a valve controller includes a first input and a first output for coupling to a valve. The valve controller is configured to selectively activate the valve after receiving a first edge of the first input signal at the first input. The valve activation includes: a peak-up phase; followed by a hold phase, wherein the current level of the valve during the hold phase is less than the current level of the valve in the rise-to-peak phase; and an activation end phase following the hold phase, in which the current ripple of the valve is smaller than the current ripple of the valve in the hold phase.
The valve controller transitions activation of the valve from the hold phase to an activation end phase after receiving a second edge of the first input signal at the first input. In an example embodiment, the duration of the activation end phase is predetermined. The duration of the hold phase is greater than the duration of the activation end phase. The first edge of the first input signal is a falling edge and the second edge of the first input signal is a rising edge following the falling edge. The valve controller transitions activation of the valve from the hold phase to an activation end phase in response to receiving a second edge of the first input signal at the first input. The valve comprises a fuel injector for a motor vehicle having a combustion engine, such that the valve controller controls the fuel injector. The valve controller includes an Application Specific Integrated Circuit (ASIC) having at least one state machine. At least one state machine generates a first output signal at a first output for receipt by the valve, the first output signal activating the valve in a rise-to-peak phase, a hold phase, and an end-of-activation phase. The amount of sloshing of the current valve is smaller than that of a current valve without the valve being activated in the activation end stage.
A method of controlling a solenoid injector valve comprising: receiving a first input signal; detecting a first edge of a first input signal; and activating the valve in response to detecting the first edge of the first input signal. Valve activation includes activating the valve in the following stages: a rise-to-peak phase during which the valve is opened; a hold phase following the rise-to-peak phase during which the valve remains open and the current level of the valve is less than the current level of the valve during the rise-to-peak phase; and an activation end phase following the hold phase, during which the current ripple in the valve is smaller than during the hold phase.
The method further comprises the following steps: detecting a second edge of the first input signal, wherein activating the valve in the activation termination phase occurs in response to detecting the second edge of the first input signal. The first edge is a falling edge of the first input signal and the second edge of the first input signal is a rising edge thereof. The second edge of the first input signal is its next edge succeeding the first edge of the first input signal.
The method may further comprise: detecting a second edge of the first input signal, wherein activating the valve in the activation termination phase occurs after detecting the second edge of the first input signal. Activation of the valve occurs for a predetermined period of time in an activation termination phase. The predetermined period of time is fixed in each instance during which the valve is activated. In one aspect, the duration of the hold phase is greater than the duration of the activation end phase. In another aspect, the duration of the activation end phase is greater than the duration of the hold phase.
Drawings
Other advantages of the disclosed subject matter will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
FIG. 1 is a waveform of a known current curve for operating a solenoid valve;
FIG. 2 is a waveform of a detailed portion of the current curve of FIG. 1;
FIG. 3 is a diagram of a vehicle having an engine control system according to an example embodiment;
FIG. 4 is a waveform of a current curve for operating a solenoid valve according to an example embodiment;
FIG. 5 is a waveform of a detailed portion of a current curve for operating the solenoid valve of FIG. 4; and
FIG. 6 is a flow chart of a method of controlling a solenoid valve according to an example embodiment.
Detailed Description
Referring to fig. 3-6, wherein like numerals indicate like parts throughout the several views, an engine control system and method of controlling actuation of a solenoid valve is shown and described herein.
Referring to FIG. 3, the
The
The
The
In the illustrated embodiment, the
In the exemplary embodiment, each
In the exemplary embodiment,
Valve activation in the rising into
In the exemplary embodiment,
FIG. 5 illustrates: as a current ripple IR in the
The
Referring to FIG. 6, a
- 上一篇:一种医用注射器针头装配设备
- 下一篇:用于控制内燃机的方法和设备