CN108958079B - Closing control system for engine EGR valve and method thereof - Google Patents
Closing control system for engine EGR valve and method thereof Download PDFInfo
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- CN108958079B CN108958079B CN201810794821.5A CN201810794821A CN108958079B CN 108958079 B CN108958079 B CN 108958079B CN 201810794821 A CN201810794821 A CN 201810794821A CN 108958079 B CN108958079 B CN 108958079B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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Abstract
The invention discloses a closing control system for an engine EGR valve, which comprises an EGR unit, a closed loop control unit and a closed loop control unit, wherein the EGR unit is used for sending an acquired EGR valve position signal to a processor unit and receiving an actuator driving current sent by the processor unit; the processor unit is used for receiving the EGR valve position signal sent by the EGR unit and the engine state signal to generate a first EGR valve position target signal, and also receiving the EGR valve position signal sent by the EGR unit, wherein the EGR valve position target signal generates a second EGR valve position target signal; generating a signal for determining the closing state of the EGR valve by using the first EGR valve position target signal, and generating an actuator driving current to be sent to an EGR unit by combining the signal with a second EGR valve position target signal; the invention also discloses a closing control method for the EGR valve of the engine, which can not apply the driving force of the motor in the process of seating the valve rod to the real zero position, thereby reducing the impact force during seating.
Description
Technical Field
The invention belongs to the technical field of control of an engine EGR valve, and particularly relates to a closing control system and a closing control method for the engine EGR valve.
Background
Although the average excess air coefficient is relatively large in the combustion process of the diesel engine, the local combustion temperature is high due to uneven components of the mixed gas, so that a large amount of NOx is easily generated. EGR (Exhaust Gas Recirculation) technology can introduce part of Exhaust Gas into an intake passage to participate in a combustion reaction together with fresh air. The oxygen concentration and the combustion temperature can be reduced due to the introduction of the exhaust gas. Whereas the production conditions for NOx are high temperature oxygen enrichment, EGR is one of the widely used NOx emission treatment technologies.
The exhaust pipe and the air inlet pipe in the EGR system are connected through an EGR pipeline, and part of waste gas can be led out from the exhaust pipe and injected into the air inlet pipe, mixed with fresh air and then injected into the air cylinder. The EGR valve is often mounted on an EGR conduit, and exhaust gas flow through the EGR conduit is adjusted in real time according to engine operating conditions to optimize engine performance. The valve rod of the EGR valve is positioned between the air inlet channel and the air outlet channel, and the position of the valve rod can be continuously changed, so that the flow condition between the air inlet channel and the air outlet channel is further changed, and the aim of adjusting the amount of the exhaust gas passing through the valve rod is fulfilled. At present, the widely used EGR valve mostly adopts a direct current motor as an actuator. The actuator is matched with a set of track system, the rotary motion of the direct current motor can be converted into the linear motion of the EGR valve rod, and the aim of controlling the position of the valve rod is achieved by adjusting the rotation of the motor. A position sensor is usually arranged in a control system of the EGR valve, and is used for feeding back the position of the valve rod in real time and realizing closed-loop control on the position of the valve rod by matching with an EGR valve control system.
In order to adapt to different operation conditions of the engine, the flow range of the exhaust gas flowing through the EGR system is very large, partial conditions completely do not need to introduce the exhaust gas, and partial conditions need a large amount of exhaust gas to participate in combustion to reduce NOx emission. This therefore places high demands on the control of the EGR valve, firstly the EGR valve needs to be actuated frequently in response to changing engine conditions, and secondly the EGR valve is guaranteed to close completely when no exhaust gas is required for combustion, so as not to allow the exhaust gas to enter the inlet duct. The above requirements pose a challenge in EGR valve control: closing control when the EGR valve is seated. On the one hand, the rapid response of the EGR valve results in a relatively rapid and tight closing of the EGR valve, which requires a relatively large force to be applied when seated. On the other hand, however, since the valve seat engaged with the EGR valve rod is also required to withstand high-temperature exhaust gas, a rigid material is often used instead of a soft material resistant to impact. Therefore, impact when the valve rod is seated easily causes collision between the valve rod and the valve seat, if the valve rod is seated to act to impact greatly, the contact surface between the valve rod and the valve seat can be damaged, damage is caused, sealing is not tight, and waste gas is leaked. Therefore, how to optimize the closing control when the EGR valve rod is seated needs to realize the quick seating of the valve rod and avoid the impact on the valve seat as much as possible, and the contradictory optimization target is always a difficult point in the control of the EGR valve.
Disclosure of Invention
In view of the above, the primary object of the present invention is to provide a closing control system for an EGR valve of an engine and a method thereof.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a closing control system for an engine EGR valve, which comprises an EGR unit and a processor unit,
the EGR unit is used for sending the collected EGR valve position signal to the processor unit and receiving the actuator driving current sent by the processor unit;
the processor unit is used for receiving the EGR valve position signal sent by the EGR unit and the engine state signal to generate a first EGR valve position target signal, and also receiving the EGR valve position signal sent by the EGR unit, wherein the EGR valve position target signal generates a second EGR valve position target signal; and generating an actuator driving current to be sent to the EGR unit by combining the first EGR valve position target signal and the second EGR valve position target signal.
In the above scheme, the EGR unit includes a sensor and an actuator.
In the above solution, the processor unit includes an EGR valve management module, a target position setting module, a position control module, a closing state module, a duty ratio management module, and a driving module, the EGR valve management module generates a first EGR valve position target signal according to an input EGR valve position signal and an engine state signal, the target position setting module generates a second EGR valve position target signal according to the first EGR valve position target signal and sends the second EGR valve position target signal to the position control module and the closing state module, the closing state module generates an EGR valve closing state signal according to the second EGR valve position target signal and sends the EGR valve closing state signal to the duty ratio management module, the position control module generates a first EGR valve driving duty ratio signal according to the input EGR valve position signal and the second EGR valve position target signal and sends the first EGR valve driving duty ratio signal to the duty ratio management module, and the duty ratio management module, and generating a second EGR valve driving duty ratio signal according to the received EGR valve closing state signal and the first EGR valve driving duty ratio signal and sending the second EGR valve driving duty ratio signal to a driving module, and generating an actuator driving current according to the second EGR valve driving duty ratio signal and sending the actuator driving current to the EGR unit by the driving module.
The embodiment of the invention also provides a closing control method for the EGR valve of the engine, which comprises the following steps: the processor generates a first EGR valve position target signal according to the input EGR valve position signal and the engine state signal, generates a second EGR valve position target signal according to the first EGR valve position target signal, and generates an EGR valve closing state signal according to the second EGR valve position target signal; and finally, generating a second EGR valve driving duty ratio signal according to the EGR valve closing state signal and the first EGR valve driving duty ratio signal, and generating an actuator driving current according to the second EGR valve driving duty ratio signal to drive a valve rod of the EGR valve to move.
In the scheme, the method comprises the following steps: generating a second EGR valve position target signal according to the first EGR valve position target signal, specifically: when the first EGR valve position target signal is greater than the closed position threshold, the second EGR valve position target signal is equal to the first EGR valve position target signal; when the first EGR valve position target signal is less than or equal to a closed position threshold and the first EGR valve position target signal is increasing, the second EGR valve position target signal is equal to the first EGR valve position target signal; and when the first EGR valve position target signal is less than or equal to a closing position threshold and the first EGR valve position target signal is decreasing, filtering the second EGR valve position target signal by taking the position filtering amplitude as a step length and taking the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal.
In the foregoing solution, filtering the second EGR valve position target signal by using the position filtering amplitude as a step length and using the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal specifically includes: if the first EGR valve position target signal is less than the difference between the second EGR valve position target signal and the position filtered magnitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal minus the position filtered magnitude; if the first EGR valve position target signal is greater than the sum of the second EGR valve position target signal and the position filtered amplitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal plus the position filtered amplitude; the filtered second EGR valve position target signal is equal to the first EGR valve position target signal if the difference between the first EGR valve position target signal and the second EGR valve position target signal is less than the position filter magnitude.
In the foregoing solution, the generating an EGR valve closed state signal according to the second EGR valve position target signal specifically includes: the processor presets the end time of five stages, starts timing when the input second EGR valve position target signal is 0, and the EGR valve closing state signal is 1 if the timing time is 0; when the timing time is greater than 0 and less than the second stage end time, the EGR valve closing state signal is 2; if the timing time is greater than the second stage end time and less than the third stage end time, the EGR valve closing state signal is 3; if the timing time is greater than the third stage end time and less than the fourth stage end time, the EGR valve closing state signal is 4; if the timing time is greater than the end time of the fourth stage and less than the end time of the fifth stage, the EGR valve closing state signal is 5; if the timed time is greater than the fifth stage end time, the EGR valve closed state signal is 6.
In the foregoing solution, the generating a second EGR valve driving duty signal according to the EGR valve closing state signal and the first EGR valve driving duty signal specifically includes: when the EGR valve closed state signal is 1, the second EGR valve driving duty cycle signal is equal to the first EGR valve driving duty cycle signal; when the EGR valve closed state signal is 2, the second EGR valve drive duty cycle signal is equal to the first EGR valve drive duty cycle signal; when the EGR valve closing state signal is 3, the second EGR valve driving duty ratio signal is in linear transition to 0; when the EGR valve closed state signal is 4, the second EGR valve drive duty cycle signal is equal to 0; when the EGR valve closing state signal is 5, the second EGR valve driving duty ratio signal is linearly transited from 0 to the EGR valve negative duty ratio target; when the EGR valve closed state signal is 6, the second EGR valve drive duty cycle signal is maintained at the EGR valve negative duty cycle target.
Compared with the prior art, the invention can not apply the driving force of the motor in the process of seating the valve rod to the real zero position, thereby reducing the impact force during seating.
Drawings
FIG. 1 is a system diagram of a closing control system for an EGR valve of an engine according to an embodiment of the present invention;
FIG. 2 is a schematic view of an EGR valve stem actuation mechanism of the present invention;
FIG. 3 is a flow chart of a method for closing control of an EGR valve of an engine according to an embodiment of the present invention;
FIG. 4 is a flowchart of step 102 of a method for closing an EGR valve in an engine according to an embodiment of the present invention;
FIG. 5 is a flowchart of step 103 of a method for closing an EGR valve in an engine according to an embodiment of the present invention;
FIG. 6 is a flowchart of step 105 of a method for closing an EGR valve in an engine according to an embodiment of the present invention;
fig. 7 is a schematic diagram of the practical application process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides a closing control system for an EGR valve of an engine, as shown in fig. 1, which includes an EGR unit 10, a processor unit 20,
the EGR unit 10 is used for sending the collected EGR valve position signal to the processor unit 20 and receiving the actuator driving current sent by the processor unit;
the processor unit is used for receiving the EGR valve position signal sent by the EGR unit 10 and the engine state signal to generate a first EGR valve position target signal, and also receiving the EGR valve position signal sent by the EGR unit 10 and the EGR valve position target signal to generate a second EGR valve position target signal; and generating an actuator driving current to be sent to the EGR unit by combining the first EGR valve position target signal and the second EGR valve position target signal.
Specifically, the EGR unit includes a sensor 11 and an actuator 12.
The processor unit 20 includes an EGR valve management module 21, a target position setting module 22, a position control module 23, a close state module 24, a duty cycle management module 25, a driving module 26, the EGR valve management module 21 generates a first EGR valve position target signal according to an input EGR valve position signal and an engine state signal, the target position setting module 22 generates a second EGR valve position target signal according to the first EGR valve position target signal and transmits the second EGR valve position target signal to the position control module 23 and the close state module 24, the close state module 24 generates an EGR valve close state signal according to the second EGR valve position target signal and transmits the EGR valve close state signal to the duty cycle management module 25, the position control module 23 generates a first EGR valve driving duty cycle signal according to the input EGR valve position signal and the second EGR valve position target signal and transmits the first EGR valve driving duty cycle signal to the duty cycle management module 25, the duty management module 25 generates a second EGR valve driving duty signal according to the received EGR valve closing state signal and the first EGR valve driving duty signal and transmits the second EGR valve driving duty signal to the driving module 26, and the driving module 26 generates an actuator driving current according to the second EGR valve driving duty signal and transmits the actuator driving current to the EGR unit 10.
The target position setting module 22 is specifically configured to determine that the second EGR valve position target signal is equal to the first EGR valve position target signal when the first EGR valve position target signal is greater than the closed position threshold; when the first EGR valve position target signal is less than or equal to a closed position threshold and the first EGR valve position target signal is increasing, the second EGR valve position target signal is equal to the first EGR valve position target signal; and when the first EGR valve position target signal is less than or equal to a closing position threshold and the first EGR valve position target signal is decreasing, filtering the second EGR valve position target signal by taking the position filtering amplitude as a step length and taking the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal.
When the first EGR valve position target signal is greater than the closed position threshold, the second EGR valve position target signal is equal to the first EGR valve position target signal; when the first EGR valve position target signal is less than or equal to a closed position threshold and the first EGR valve position target signal is increasing, the second EGR valve position target signal is equal to the first EGR valve position target signal; and when the first EGR valve position target signal is less than or equal to a closing position threshold and the first EGR valve position target signal is decreasing, filtering the second EGR valve position target signal by taking the position filtering amplitude as a step length and taking the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal.
The second EGR valve position target signal is filtered with the position filter amplitude as a step length and the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal, specifically: if the first EGR valve position target signal is less than the difference between the second EGR valve position target signal and the position filtered magnitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal minus the position filtered magnitude; if the first EGR valve position target signal is greater than the sum of the second EGR valve position target signal and the position filtered amplitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal plus the position filtered amplitude; the filtered second EGR valve position target signal is equal to the first EGR valve position target signal if the difference between the first EGR valve position target signal and the second EGR valve position target signal is less than the position filter magnitude.
Further, a timer is set in the closed state module 24, and the end time of the five stages is preset, when the input second EGR valve position target signal is 0, timing is started, and if the timer is 0, the EGR valve closed state signal is 1; when the timer is greater than 0 and less than the second stage end time, the EGR valve closing state signal is 2; if the timer is greater than the second stage end time and less than the third stage end time, the EGR valve closed state signal is 3; if the timer is greater than the third stage end time and less than the fourth stage end time, the EGR valve closed state signal is 4; if the timer is greater than the fourth stage end time and less than the fifth stage end time, the EGR valve closed state signal is 5; if the timer is greater than the fifth stage end time, the EGR valve closed status signal is 6.
The duty cycle management module 25 is specifically configured to, when the EGR valve closed state signal is 1, make the second EGR valve driving duty cycle signal equal to the first EGR valve driving duty cycle signal; when the EGR valve closed state signal is 2, the second EGR valve drive duty cycle signal is equal to the first EGR valve drive duty cycle signal; when the EGR valve closing state signal is 3, the second EGR valve driving duty ratio signal is in linear transition to 0; when the EGR valve closed state signal is 4, the second EGR valve drive duty cycle signal is equal to 0; when the EGR valve closing state signal is 5, the second EGR valve driving duty ratio signal is linearly transited from 0 to the EGR valve negative duty ratio target; when the EGR valve closed state signal is 6, the second EGR valve drive duty cycle signal is maintained at the EGR valve negative duty cycle target.
As shown in fig. 2, it can be seen that the present invention changes the flow capacity between the intake and exhaust passages by controlling the valve stem position.
The embodiment of the invention also provides a closing control method for the EGR valve of the engine, which is realized by the following steps as shown in FIG. 3:
step 101: the processor generates a first EGR valve position target signal based on the input EGR valve position signal and the engine state signal.
Step 102: a second EGR valve position target signal is generated based on the first EGR valve position target signal.
Specifically, as shown in FIG. 4, when the first EGR valve position target signal is greater than the closed position threshold, the second EGR valve position target signal is equal to the first EGR valve position target signal; when the first EGR valve position target signal is less than or equal to a closed position threshold and the first EGR valve position target signal is increasing, the second EGR valve position target signal is equal to the first EGR valve position target signal; and when the first EGR valve position target signal is less than or equal to a closing position threshold and the first EGR valve position target signal is decreasing, filtering the second EGR valve position target signal by taking the position filtering amplitude as a step length and taking the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal.
The second EGR valve position target signal is filtered with the position filter amplitude as a step length and the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal, specifically: if the first EGR valve position target signal is less than the difference between the second EGR valve position target signal and the position filtered magnitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal minus the position filtered magnitude; if the first EGR valve position target signal is greater than the sum of the second EGR valve position target signal and the position filtered amplitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal plus the position filtered amplitude; the filtered second EGR valve position target signal is equal to the first EGR valve position target signal if the difference between the first EGR valve position target signal and the second EGR valve position target signal is less than the position filter magnitude.
Step 103: an EGR valve closed state signal is generated based on the second EGR valve position target signal.
Specifically, as shown in fig. 5, the processor presets the end time of five phases, starts timing when the input second EGR valve position target signal is 0, and the EGR valve closing state signal is 1 if the timing time is 0; when the timing time is greater than 0 and less than the second stage end time, the EGR valve closing state signal is 2; if the timing time is greater than the second stage end time and less than the third stage end time, the EGR valve closing state signal is 3; if the timing time is greater than the third stage end time and less than the fourth stage end time, the EGR valve closing state signal is 4; if the timing time is greater than the end time of the fourth stage and less than the end time of the fifth stage, the EGR valve closing state signal is 5; if the timed time is greater than the fifth stage end time, the EGR valve closed state signal is 6.
Step 104: a first EGR valve drive duty cycle signal is generated based on the input EGR valve position signal and the second EGR valve position target signal.
Specifically, a PID algorithm is employed to determine a first drive duty cycle signal based on the second EGR valve target position signal and the EGR valve position signal.
Step 105: and generating a second EGR valve driving duty ratio signal according to the EGR valve closing state signal and the first EGR valve driving duty ratio signal.
Specifically, as shown in FIG. 6, when the EGR valve closed state signal is 1, the second EGR valve drive duty signal is equal to the first EGR valve drive duty signal; when the EGR valve closed state signal is 2, the second EGR valve drive duty cycle signal is equal to the first EGR valve drive duty cycle signal; when the EGR valve closing state signal is 3, the second EGR valve driving duty ratio signal is in linear transition to 0; when the EGR valve closed state signal is 4, the second EGR valve drive duty cycle signal is equal to 0; when the EGR valve closing state signal is 5, the second EGR valve driving duty ratio signal is linearly transited from 0 to the EGR valve negative duty ratio target; when the EGR valve closed state signal is 6, the second EGR valve drive duty cycle signal is maintained at the EGR valve negative duty cycle target.
Step 106: and generating actuator driving current according to the second EGR valve driving duty ratio signal to drive the valve rod of the EGR valve to move.
The invention adds two control stages on the basis of three control stages of the existing closing control strategy, and changes the control stages into five stages. The new control phase is a driving force control phase and a maintaining phase. The driving force control phase is located after the existing position control phase. The maintenance phase is located after the driving force control phase and before the existing sealing phase. The control targets in the driving force control phase and the maintaining phase are both duty ratios. In the driving force control stage, the driving duty ratio is slowly set to be 0, so that the valve rod is slowly lowered, and the impact of seating to a real zero position is reduced. In the maintaining stage, the driving duty ratio is maintained at 0, the purpose of not applying the driving force of the motor to the valve rod is achieved, and the stable completion of the seating process can be guaranteed in the stage. Then negative duty ratio is realized to ensure the sealing of the valve seat. The invention can ensure that the valve seat is seated to the real zero position with small impact as far as possible before applying negative duty cycle, and reduce the impact in the seating process. In the original closing strategy, the valve rod can directly apply negative duty ratio from the initial position higher than the real zero position, and the seating process is acted by the reset system and also has negative driving force applied by the motor, so that the seating impact of the valve rod is obviously higher than that of the valve rod implementing the invention.
As shown in FIG. 7, during the speed control phase, the first EGR valve position target signal falls rapidly, and when it falls below the closed position threshold, the triggering condition of the target position setting module filtering algorithm is met and filtered. The first EGR valve position target signal is albeit quickly reaching sensor 0 position. However, due to the filtering algorithm, the magnitude of the change that the target position setting module outputs the second EGR valve position target signal is limited, and the second EGR valve position target signal slowly changes to 0, as indicated by the dashed and dotted lines. Since the position control module is input with the second EGR valve position target signal, the control target for the actual position is also the second EGR valve position target signal, which is likewise slowly ramped down to the sensor 0 position. Since the second EGR valve position target signal is not 0, the closed state output by the closed state module is 1, while the output of the duty cycle management module is the position control module output duty cycle. In the whole control process of the stage, the valve rod seating speed is controlled by limiting the change rate of the position target, the descending speed of the valve rod can be controlled when the position is close to the 0 position, and the collision of the valve rod and a valve seat caused by control overshoot is avoided.
In the position control stage, the second EGR valve position target signal filtering is finished and reaches the position of the sensor 0, the timer triggering condition of the closed state module is met, the timer starts to time, the time is shorter than the second stage ending time, the closed state is 2, and the output of the duty ratio management module is still the duty ratio output by the position control module. On the other hand, since the first EGR valve position target signal and the second EGR valve position target signal are always maintained at the sensor 0 position, the position module also adjusts the duty cycle via the PID algorithm to control the actual position near the sensor 0 position. The entire control process of this stage can keep the valve rod near the position of the sensor 0, and the movement speed of the valve rod is reduced to 0.
In the driving force control phase, the off state is 3 because the timer is longer than the second phase end time but shorter than the third phase end time. At which time the output of the duty cycle management module transitions to 0. The valve rod moves slowly to the real 0 position under the action of the gradually reduced acting force. This phase allows the valve stem to be seated at a very slow rate into the true 0 position, eventually subject only to the reset system force, and no force is applied by the motor.
In the maintenance phase, the off state is 4 since the timer is longer than the end time of the third phase but shorter than the end time of the fourth phase. The output of the duty cycle management module remains at 0 at this time. The valve stem is maintained at the true 0 position and its speed of movement drops to 0. This phase ensures that the valve stem is as close as possible to and maintained in the true 0 position.
In the sealing stage, the closing state is 5 because the timer is greater than the end time of the fourth stage but less than the end time of the fifth stage; at which point the output of the duty cycle management module transitions to a negative duty cycle target. The motor applies negative acting force to the valve rod, so that the valve rod is combined with the valve seat more tightly, and the sealing performance is ensured; but since the valve stem has previously been held stationary in the true 0 position, the process displacement is small and the impact is also small.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A closing control system for an engine EGR valve is characterized by comprising an EGR unit and a processor unit, wherein the EGR unit comprises a sensor and an actuator and is used for sending a collected EGR valve position signal to the processor unit and receiving actuator driving current sent by the processor unit; the processor unit is used for receiving the EGR valve position signal sent by the sensor and the engine state signal to generate a first EGR valve position target signal, and also receiving the EGR valve position signal sent by the sensor and the first EGR valve position target signal to generate a second EGR valve position target signal; and the control circuit is also used for generating a signal for determining the closing state of the EGR valve according to the first EGR valve position target signal, and generating an actuator driving current to be sent to the actuator by combining the signal with a second EGR valve position target signal.
2. The closure control system for an engine EGR valve of claim 1, wherein the processor unit comprises an EGR valve management module, a target position setting module, a position control module, a closure status module, a duty cycle management module, a driver module, the EGR valve management module generating a first EGR valve position target signal based on an input EGR valve position signal and an engine status signal, the target position setting module generating a second EGR valve position target signal based on the first EGR valve position target signal and sending to the position control module and the closure status module; the closed state module generates an EGR valve closed state signal according to the second EGR valve position target signal and sends the EGR valve closed state signal to the duty ratio management module; the position control module generates a first EGR valve drive duty cycle signal according to the input EGR valve position signal and a second EGR valve position target signal and sends the first EGR valve drive duty cycle signal to the duty cycle management module; the duty ratio management module generates a second EGR valve driving duty ratio signal according to the received EGR valve closing state signal and the first EGR valve driving duty ratio signal and sends the second EGR valve driving duty ratio signal to the driving module; and the driving module generates actuator driving current according to the second EGR valve driving duty ratio signal and sends the actuator driving current to the EGR unit.
3. A closing control method for an EGR valve of an engine, characterized by: the processor generates a first EGR valve position target signal according to the input EGR valve position signal and the engine state signal, generates a second EGR valve position target signal according to the first EGR valve position target signal, and generates an EGR valve closing state signal according to the second EGR valve position target signal; and finally, generating a second EGR valve driving duty ratio signal according to the EGR valve closing state signal and the first EGR valve driving duty ratio signal, and generating an actuator driving current according to the second EGR valve driving duty ratio signal to drive a valve rod of the EGR valve to move.
4. The closing control method for an engine EGR valve according to claim 3, where the first EGR valve position target signal generates a second EGR valve position target signal, in particular: when the first EGR valve position target signal is greater than the closed position threshold, the second EGR valve position target signal is equal to the first EGR valve position target signal; when the first EGR valve position target signal is less than or equal to a closed position threshold and the first EGR valve position target signal is increasing, the second EGR valve position target signal is equal to the first EGR valve position target signal; and when the first EGR valve position target signal is less than or equal to a closing position threshold and the first EGR valve position target signal is decreasing, filtering the second EGR valve position target signal by taking the position filtering amplitude as a step length and taking the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal.
5. The closing control method for an engine EGR valve according to claim 4, wherein the second EGR valve position target signal is filtered with a position filter amplitude as a step and the second EGR valve position target signal as an input to obtain a filtered second EGR valve position target signal, specifically: if the first EGR valve position target signal is less than the difference between the second EGR valve position target signal and the position filtered magnitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal minus the position filtered magnitude; if the first EGR valve position target signal is greater than the sum of the second EGR valve position target signal and the position filtered amplitude, then the filtered second EGR valve position target signal is equal to the original value of the second EGR valve position target signal plus the position filtered amplitude; the filtered second EGR valve position target signal is equal to the first EGR valve position target signal if the difference between the first EGR valve position target signal and the second EGR valve position target signal is less than the position filter magnitude.
6. The closing control method for the engine EGR valve according to claim 3, 4 or 5, characterized in that the EGR valve closing status signal is generated according to the second EGR valve position target signal, in particular: the processor presets the end time of five stages, starts timing when the input second EGR valve position target signal is 0, and the EGR valve closing state signal is 1 if the timing time is 0; when the timing time is greater than 0 and less than the second stage end time, the EGR valve closing state signal is 2; if the timing time is greater than the second stage end time and less than the third stage end time, the EGR valve closing state signal is 3; if the timing time is greater than the third stage end time and less than the fourth stage end time, the EGR valve closing state signal is 4; if the timing time is greater than the end time of the fourth stage and less than the end time of the fifth stage, the EGR valve closing state signal is 5; if the timed time is greater than the fifth stage end time, the EGR valve closed state signal is 6.
7. The closing control method for the engine EGR valve according to claim 6, wherein the generating a second EGR valve drive duty cycle signal from the EGR valve closed state signal and the first EGR valve drive duty cycle signal is specifically: when the EGR valve closed state signal is 1, the second EGR valve driving duty cycle signal is equal to the first EGR valve driving duty cycle signal; when the EGR valve closed state signal is 2, the second EGR valve drive duty cycle signal is equal to the first EGR valve drive duty cycle signal; when the EGR valve closing state signal is 3, the second EGR valve driving duty ratio signal is in linear transition to 0; when the EGR valve closed state signal is 4, the second EGR valve drive duty cycle signal is equal to 0; when the EGR valve closing state signal is 5, the second EGR valve driving duty ratio signal is linearly transited from 0 to the EGR valve negative duty ratio target; when the EGR valve closed state signal is 6, the second EGR valve drive duty cycle signal is maintained at the EGR valve negative duty cycle target.
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