CN116291921A - A control method, device and equipment for an EGR valve - Google Patents

Abstract

The present application discloses a control method, device and equipment for an EGR valve. The method includes: determining whether the current exhaust gas temperature is lower than a first calibration value when determining that the engine is in a reverse drag condition; determining whether the current exhaust gas temperature is lower than the first calibration value; When the calibration value is set, increase the opening of the EGR valve according to the preset range, otherwise keep closing the EGR valve; after increasing the opening of the EGR valve according to the preset range, when a throttle demand is detected, determine whether the current power demand is met according to the current driving state; When the current driving state determines that the current power demand is not met, the EGR valve is closed. Controlling the switch of the EGR valve through the scheme of controlling the EGR valve provided in the present application can reduce the difficulty of heat preservation of the engine post-treatment, which is conducive to improving the economy of the whole vehicle and meeting the power demand of the whole vehicle.

Description

A control method, device and equipment for an EGR valve

technical field

The present application belongs to the field of engines, and in particular relates to a method, device and equipment for controlling an EGR valve.

Background technique

In order to avoid wearing the brake pads of the vehicle when going down a long slope, the driver will use the engine to drag backwards to form a braking effect on the driving wheels to reduce the speed of the vehicle. Engine back drag, also known as engine braking, means that when the vehicle is going downhill or coasting, lift the accelerator pedal to stop the engine from injecting fuel and the spark plug to stop ignition, and at the same time do not step on the clutch pedal to keep the engine connected to the transmission system. Use the inertia of the car to reverse the engine, and use the compression resistance generated by the compression stroke of the engine, internal friction and intake and exhaust resistance to form a braking effect on the driving wheel.

In order to meet emission requirements, the engine adopts Exhaust Gas Recirculation (EGR) technology, based on the opening of the EGR valve to control the amount of exhaust gas recirculation of the intake system; and after using Selective Catalytic Reduction (SCR) The treatment system selectively reduces the nitrogen oxides in the exhaust gas to nitrogen and water.

In the related art, when it is detected that the vehicle is in a backward dragging condition, the EGR valve is kept in a long-closed state, and then the EGR valve is opened after it is detected that the vehicle has a throttle demand. Under this control strategy, when the engine is in reverse dragging condition, on the one hand, high-temperature exhaust gas no longer enters the cylinder for circulation, which may make the work consumed by the engine compressing the gas insufficient to provide sufficient reverse braking force; on the other hand, Due to long-term backward dragging, there is no combustion heat release and cold air keeps entering the cylinder, which will reduce the exhaust temperature and accelerate the temperature drop rate of the SCR after-treatment system, which is not conducive to the heat preservation of the SCR after-treatment system of the engine and will lead to heating during the entire driving process. The number of modes increases, which affects the driving economy of the whole vehicle. In addition, when the vehicle is about to exit the reverse drag condition and requires a large output torque, opening the EGR valve may affect the vehicle's ability to reach the required output torque.

Contents of the invention

The purpose of this application is to provide a control method, device and equipment for an EGR valve. By controlling the switch state of the EGR valve, the switch of the EGR valve is controlled based on the exhaust temperature when the vehicle is driving in reverse, which is beneficial to the improvement of the economy of the vehicle. And reduce the heat preservation difficulty of engine aftertreatment.

In a first aspect, the present application provides a method for controlling an EGR valve, the method comprising:

When it is determined that the engine is in reverse dragging condition, it is judged whether the current exhaust gas temperature is lower than the first calibration value;

When it is determined that the current exhaust gas temperature is lower than the first calibration value, increase the opening of the EGR valve according to the preset range, otherwise keep closing the EGR valve;

After increasing the EGR valve opening according to the preset range, when a throttle demand is detected, determine whether the current power demand is met according to the current driving state;

When it is determined according to the current driving state that the current power demand is not met, the EGR valve is closed.

In a possible implementation manner, determining whether the current power demand is met according to the current driving state includes:

According to at least one of the current accelerator state value, slope value, and acceleration, it is determined whether the current power demand is met.

In a possible implementation manner, the throttle state value includes throttle speed and throttle opening, and determining whether the current power demand is met according to the current throttle state value includes:

Judging whether the current throttle speed is greater than the second calibration value, and whether the current throttle opening is greater than the third calibration value;

When the current throttle speed is greater than the second calibration value and the current throttle opening is greater than the third calibration value, it is determined that the current power demand is not met.

In a possible implementation manner, determining whether the current power demand is met according to the current gradient value includes:

calculating the current slope value based on the original slope signal collected by the sensor, and judging whether the current slope value is greater than the fourth calibration value;

When the current slope value is greater than the fourth calibration value, it is determined that the current power demand is not met.

In a possible implementation manner, determining whether the current power requirement is met according to the current acceleration includes:

judging whether the current vehicle acceleration is less than the fifth calibration value;

When the current vehicle acceleration is less than the fifth calibration value, it is determined that the current power demand is not met.

In a possible implementation manner, the method also includes:

When it is determined according to the current driving state that the current power demand is met, the current EGR valve opening degree is maintained.

In a possible implementation manner, when determining whether the current power demand is met according to at least two items of the current accelerator state value, slope value, and acceleration, wherein:

The priority of determining whether the current power demand is met according to the current throttle state value is higher than that of determining whether the current power demand is met according to the current slope value;

The priority of determining whether the current power demand is met according to the current slope value is higher than that of determining whether the current power demand is met according to the current acceleration.

In a second aspect, the present application provides a control device for an EGR valve, the device comprising:

The temperature judging module is used to determine whether the current exhaust gas temperature is less than the first calibration value when the engine is in the reverse drag working condition;

The first EGR valve control module is configured to increase the opening of the EGR valve according to a preset range when the current exhaust gas temperature is lower than the first calibration value, otherwise keep closing the EGR valve;

The demand detection module is used to determine whether the current power demand is met according to the current driving state when the throttle demand is detected after the EGR valve opening is increased according to the preset range;

The second EGR valve control module is configured to close the EGR valve when it is determined according to the current driving state that the current power demand is not met.

In a third aspect, an embodiment of the present application provides a control device for an EGR valve, including at least one processor; and a memory connected in communication with the at least one processor; wherein, the memory stores information that can be controlled by the at least one Instructions executed by a processor, the instructions are executed by the at least one processor, so that the at least one processor can execute the EGR valve control method described in any one of the first aspects of the present application.

In the fourth aspect, the embodiment of the present application also provides a computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the terminal device, the terminal device can execute the method described in the first aspect of the present application. The control method of any one of the EGR valves provided in .

The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

The application provides a control method, device and equipment for an EGR valve. By controlling the switch state of the EGR valve, the switch of the EGR valve is controlled based on the exhaust temperature when the vehicle is driving in reverse, which is beneficial to the improvement of the economy of the vehicle and the reduction of engine pressure. The post-processing is difficult to keep warm, and after the accelerator demand is detected, the EGR valve switch state is controlled according to whether the current power demand is met, and the power demand of the whole vehicle is prioritized.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is the flow chart of the control method of the EGR valve that the embodiment of the present application provides;

FIG. 2 is a flow chart of a method for controlling the switch of the EGR valve according to the current throttle state value provided by the embodiment of the present application;

3 is a flowchart of a method for controlling the switch of the EGR valve according to the current gradient value provided by the embodiment of the present application;

4 is a flowchart of a method for controlling the switch of the EGR valve according to the current acceleration provided by the embodiment of the present application;

5 is a flow chart of a method for controlling the switch of the EGR valve according to the current throttle state value, gradient value and acceleration provided by the embodiment of the present application;

6 is a flow chart of a method for controlling the switch of the EGR valve according to the current exhaust gas temperature, accelerator state value, slope value and acceleration provided by the embodiment of the present application;

7 is a schematic diagram of a control device for an EGR valve provided in an embodiment of the present application;

Fig. 8 is a schematic diagram of the control equipment of the EGR valve provided by the embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Wherein, the described embodiments are some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

There is a kind of driving condition of the vehicle, where the wheels drive the engine in reverse through the transmission system, which is called the reverse drag condition. At this time, the engine is in the backward drag condition, referred to as the engine reverse drag.

Engine back drag, also known as engine braking, means that when the vehicle is going downhill or coasting, lift the accelerator pedal to stop the engine from injecting fuel and the spark plug to stop ignition, and at the same time do not step on the clutch pedal to keep the engine connected to the transmission system. Use the inertia of the vehicle to reverse the engine operation, and use the compression resistance generated by the compression stroke of the engine, internal friction and intake and exhaust resistance to form a braking effect on the driving wheel. Use the engine to drag backwards to form a braking effect on the driving wheels to reduce the speed of the vehicle, which can prevent the driver from wearing the brake pads of the vehicle when going down a long slope, causing the image of brake failure.

In order to meet emission requirements, the engine adopts Exhaust Gas Recirculation (EGR) technology, based on the opening of the EGR valve to control the amount of exhaust gas recirculation of the intake system; and after using Selective Catalytic Reduction (SCR) The treatment system selectively reduces the nitrogen oxides in the exhaust gas to nitrogen and water. In the post-processing process, the dosing unit will accurately inject the amount of urea that matches the engine operating conditions into the exhaust pipe according to the instructions given by the engine electronic control unit. A catalytic reduction reaction occurs in the reactor, and finally produces harmless nitrogen and water.

In related technologies, the EGR valve is kept in a long-closed state when it is detected that the vehicle is in a backward dragging condition, and then the EGR valve is opened after detecting that the vehicle has a throttle demand, and the opening of the EGR valve is controlled according to a corresponding strategy. Under this control strategy, when the engine is in reverse dragging condition, on the one hand, high-temperature exhaust gas no longer enters the cylinder for circulation, which may make the work consumed by the engine compressing the gas insufficient to provide sufficient reverse braking force; on the other hand, Due to long-term backward dragging, there is no combustion heat release and cold air keeps entering the cylinder, which will reduce the exhaust temperature and accelerate the temperature drop rate of the SCR after-treatment system, which is not conducive to the heat preservation of the SCR after-treatment system of the engine and will lead to heating during the entire driving process. The number of modes increases, which affects the driving economy of the whole vehicle. In addition, when the vehicle is about to exit the reverse drag condition and requires a large output torque, the existing EGR valve control strategy will open the EGR valve by default and control the EGR valve opening according to the corresponding strategy, which may affect the output of the vehicle to meet the demand. torque.

In view of the above problems, the present application provides a control method, device and equipment for an EGR valve. By controlling the switch state of the EGR valve, the switch of the EGR valve is controlled based on the exhaust temperature when the vehicle is driving in reverse, which is beneficial to the economical efficiency of the vehicle. Improve and reduce the heat preservation difficulty of engine post-processing, and after detecting the throttle demand, control the EGR valve switch state according to whether the current power demand is met, and give priority to meeting the vehicle power demand.

A method for controlling an EGR valve provided by the present invention will be described below through specific embodiments.

As shown in Figure 1, the flow chart of the control method for the EGR valve provided by the embodiment of the present application, the method includes the following steps:

Step 11: Judging whether the current engine is in the reversed mode, if so, execute step 12, otherwise end the judgment.

Step 12: When it is determined that the engine is in the reversed mode, judge whether the current exhaust gas temperature is lower than the first calibration value, if so, execute step 13, otherwise end the judgment;

Prolonged back-drag driving will cause insufficient exhaust temperature of the engine, which in turn will cause the temperature of the aftertreatment part to fail to meet the working standard of the SCR aftertreatment system. The SCR post-treatment system needs certain temperature conditions to work. If the exhaust temperature is not enough, urea crystallization will occur, resulting in poor exhaust, which will affect the engine power.

Therefore, in the embodiment of the present application, when the engine is in the process of reverse engine operation, it is necessary to determine whether the current exhaust gas temperature is within the set range.

Exemplarily, after the current exhaust temperature is determined based on the exhaust temperature sensing signal collected by the exhaust temperature sensor, it is determined whether the current exhaust temperature is less than the first calibration value. It should be noted that the first calibration value may be an empirical value obtained in advance based on experiments, or a value preset according to actual needs, which is not limited in the present application.

Step 13: When it is determined that the current exhaust gas temperature is lower than the first calibration value, increase the opening of the EGR valve according to the preset range, otherwise end the judgment and keep closing the EGR valve;

When it is determined that the current exhaust gas temperature is lower than the first calibration value, it means that the current engine exhaust temperature is insufficient, so that the temperature of the after-treatment part cannot reach the working standard of the SCR after-treatment system. Therefore, it is necessary to increase the engine exhaust temperature and reduce the temperature of the SCR after-treatment system. temperature drop rate.

In order to increase the engine exhaust temperature and reduce the temperature drop rate of the SCR after-treatment system, it is necessary to increase the EGR valve opening according to the preset range and increase the exhaust gas intake. The temperature of the exhaust gas discharged from the cylinder is higher than that of the cold air, so by circulating the exhaust gas when the current engine exhaust temperature is insufficient, the engine exhaust temperature can be increased and the temperature drop rate of the SCR after-treatment system can be reduced, which is beneficial to the heat preservation of the engine SCR after-treatment system , Improve vehicle driving economy.

When it is determined that the current exhaust gas temperature is not less than the first calibration value, it means that the current engine exhaust temperature meets the requirements, and the temperature of the aftertreatment part reaches the working standard of the SCR aftertreatment system, so the EGR valve is kept closed.

In one or more embodiments, when it is determined that the engine is in reverse dragging mode, it is determined whether the current exhaust gas temperature is lower than the first calibration value according to a preset time interval, and when it is determined that the current exhaust gas temperature is lower than the first calibration value, according to the preset time interval Set the range to increase the opening of the EGR valve, otherwise keep the EGR valve closed;

Step 14: After increasing the opening of the EGR valve according to the preset range, check whether there is a demand for throttle, if so, execute step 15, otherwise end the judgment;

Step 15: When it is detected that there is an accelerator demand, determine whether the power demand is currently met according to the current driving state, if so, perform step 16, otherwise perform step 17;

In the process of driving backwards, when the driver judges that the downhill or coasting is about to end, since the inertia of the vehicle is no longer sufficient to reverse the engine operation, the driver will step on the accelerator to restart the engine fuel injection and the spark plug to re-ignite, and then recover. The combustion process of the fuel in the cylinder, that is, the engine resumes output power, and at this time, it will detect that there is a current throttle demand.

Step 16: When it is determined according to the current driving state that the current power demand is met, keep the current EGR valve opening;

Step 17: Close the EGR valve when it is determined that the current power demand is not met according to the current driving state.

After the engine resumes power output, the driving environment of the vehicle may change greatly when the downhill or coasting is about to end, so that the engine needs to output greater power to meet the driving needs of the vehicle.

After the end of the downhill or coasting, the vehicle may start to climb the slope. At this time, the vehicle needs a lot of power to go up the slope. The power output by the current engine may not meet the power demand. Therefore, after increasing the EGR valve opening according to the preset range, it is detected that When there is an accelerator demand, it is necessary to determine whether the current power demand is met according to the current driving state, and to close the EGR valve when it is determined according to the current driving state that the current power demand is not met.

In one or more embodiments, when determining whether the current power requirement is met according to the current driving state, determine whether the current power requirement is met according to at least one of the current accelerator state value, slope value, and acceleration. When it is determined that the current power demand is not met, the EGR valve is closed, otherwise the current opening of the EGR valve is maintained. Among them, when it is determined that the current power demand is not met, the amount of exhaust gas circulation can be reduced by closing the EGR valve, and at the same time, the air intake amount can be relatively increased, which is beneficial to the combustion of fuel in the cylinder, so that the engine can output greater power.

It should be noted that in this embodiment, when it is determined that the current power demand is met, maintaining the current EGR valve opening refers to deactivating the EGR valve control strategy provided in this application and maintaining the operation of the original EGR valve control strategy.

In the embodiment of the present application, by comprehensively considering at least one of the current throttle state value, slope value, and acceleration, it is judged whether the current driving state can make the vehicle meet the power demand, and output enough power to enable the vehicle to complete the uphill.

The following describes how to control the switch of the EGR valve according to the current driving state.

1) Throttle status value

In the embodiment of the present application, the accelerator state value includes an accelerator speed and an accelerator opening, the accelerator speed represents the speed at which the accelerator is depressed, and the accelerator opening represents the depth of the accelerator depression.

As shown in Figure 2, the flow chart of the method for controlling the switch of the EGR valve according to the current throttle state value provided by the embodiment of the present application, the method includes the following steps:

Step 21: Determine whether the current throttle speed is greater than the second calibration value, and whether the current throttle opening is greater than the third calibration value, if so, perform step 22, otherwise perform step 23;

Step 22: When the current throttle speed is greater than the second calibration value and the current throttle opening is greater than the third calibration value, it is determined that the current power demand is not met, and the EGR valve is closed;

When the current throttle speed is greater than the second calibration value and the current throttle opening is greater than the third calibration value, it means that the engine needs to output a large power, so the EGR valve needs to be closed to give priority to meeting the power demand of the vehicle.

Step 23: When the current accelerator speed is not greater than the second calibration value, and/or, when the current accelerator opening is not greater than the third calibration value, it is determined that the current power demand is met, and the current EGR valve opening is maintained.

It should be noted that the second calibration value and the third calibration value may be empirical values obtained in advance based on experiments, or values preset according to actual needs, which are not limited in the present application.

2) Slope value

As shown in Figure 3, it is a flow chart of a method for controlling the switch of the EGR valve according to the current gradient value provided by the embodiment of the present application. The method includes the following steps:

Step 31: Determine whether the current slope value is greater than the fourth calibration value, if so, execute step 32, otherwise execute step 33;

Wherein, the current slope value is calculated based on the original slope signal collected by the sensor.

Step 32: When the current slope value is greater than the fourth calibration value, it is determined that the current power demand is not met, and the EGR valve is closed;

When the current gradient value is greater than the fourth calibration value, it means that the gradient of the road on which the vehicle is currently traveling has reached the set threshold, and the engine needs to output more power. Therefore, the EGR valve needs to be closed to give priority to meeting the power demand of the vehicle.

Step 33: When the current gradient value is not greater than the fourth calibration value, it is determined that the current power demand is met, and the current EGR valve opening is maintained.

It should be noted that the fourth calibration value may be an empirical value obtained in advance based on experiments, or a value preset according to actual needs, which is not limited in the present application.

3) Acceleration

As shown in FIG. 4, it is a flowchart of a method for controlling the switch of the EGR valve according to the current acceleration provided by the embodiment of the present application. The method includes the following steps:

Step 41: Determine whether the current vehicle acceleration is less than the fifth calibration value, if so, execute step 42, otherwise execute step 43;

Step 42: When the current vehicle acceleration is less than the fifth calibration value, it is determined that the current power demand is not met, and the EGR valve is closed;

The current vehicle acceleration refers to the acceleration when the current vehicle is actually driving. When the current vehicle acceleration is less than the set threshold, it means that the actual acceleration of the current vehicle cannot meet the uphill demand, and the engine needs to output more power, so the EGR valve needs to be closed. Prioritize meeting the power needs of the vehicle.

Step 43: When the current vehicle acceleration is not less than the fifth calibration value, it is determined that the current power requirement is met, and the current EGR valve opening is maintained.

It should be noted that the fifth calibration value may be an empirical value obtained in advance based on experiments, or a value preset according to actual needs, which is not limited in the present application.

In one or more embodiments, according to at least two of the current accelerator state value, slope value, and acceleration, when determining whether the current power demand is met, wherein:

The priority of determining whether the current power demand is met according to the current throttle state value is higher than that of determining whether the current power demand is met according to the current slope value;

The priority of determining whether the current power demand is met according to the current slope value is higher than that of determining whether the current power demand is met according to the current acceleration.

4) Throttle status value, slope value and acceleration

As shown in Figure 5, the flow chart of the method for controlling the switch of the EGR valve according to the current accelerator state value, gradient value and acceleration provided by the embodiment of the present application, the method includes the following steps:

Step 51: Determine whether the current throttle speed is greater than the second calibration value, and whether the current throttle opening is greater than the third calibration value, if so, perform step 54, otherwise perform step 52;

Step 52: Determine whether the current slope value is greater than the fourth calibration value, if so, execute step 54, otherwise execute step 53;

Step 53: Determine whether the current vehicle acceleration is less than the fifth calibration value, if so, execute step 54, otherwise execute step 55;

Step 54: Determine that the current power demand is not met, and close the EGR valve;

Step 55: Determine that the current power demand is met, and maintain the current EGR valve opening.

In the embodiment of the present application, when it is judged that the engine is in reverse dragging mode, in order to prevent the temperature of the post-processing part from reaching the working standard of the SCR post-processing system, the EGR valve is controlled by judging whether the current exhaust gas temperature is lower than the first calibration value . When the downhill or coasting is about to end, since the vehicle inertia is no longer enough to reverse the engine operation, the engine output power can be restored by stepping on the accelerator. At this time, it is necessary to control the EGR valve by judging whether the current driving state meets the power demand.

As shown in Figure 6, the flow chart of the method for controlling the switch of the EGR valve according to the current exhaust gas temperature, throttle state value, slope value and acceleration provided by the embodiment of the present application, the method includes the following steps:

Step 61: Judging whether the current engine is in a reversed mode, if so, execute step 62, otherwise, end the judgment.

As a feasible implementation manner, step 61 is executed at a set time interval.

Step 62: Judging whether the current exhaust gas temperature is lower than the first calibration value, if so, execute step 63, otherwise end the judgment;

As a feasible implementation manner, when it is determined that the current engine is in the process of reverse dragging, step 62 is executed at a set time interval until the condition for executing step 63 is satisfied.

Step 63: When it is determined that the current exhaust gas temperature is lower than the first calibration value, increase the opening of the EGR valve according to a preset range, and then execute step 64;

Step 64: Detect whether there is a throttle demand at present, if so, execute step 65, otherwise end the judgment;

As a feasible implementation manner, after increasing the opening degree of the EGR valve according to a preset range, step 64 is executed at a set time interval until the condition for executing step 65 is satisfied.

Step 65: Determine whether the current throttle speed is greater than the second calibration value, and whether the current throttle opening is greater than the third calibration value, if so, perform step 68, otherwise perform step 66;

Step 66: Determine whether the current slope value is greater than the fourth calibration value, if so, execute step 68, otherwise execute step 67;

Step 67: Judging whether the current vehicle acceleration is less than the fifth calibration value, if so, execute step 68, otherwise execute step 69;

Step 68: Determine that the current power demand is not met, and close the EGR valve;

Step 69: Determine that the current power demand is met, and maintain the current EGR valve opening.

Based on the control method of the EGR valve provided in the embodiment of the present application, by controlling the switch state of the EGR valve, the switch of the EGR valve is controlled based on the exhaust temperature when the vehicle is driving in reverse, which is beneficial to the improvement of the economy of the vehicle and the reduction of engine after-effects. It is difficult to deal with heat preservation, and after detecting the throttle demand, judge whether the current driving state meets the power demand according to at least one of the current throttle state value, slope value, and acceleration, and then control the EGR valve switch state to give priority to meeting the requirements of the entire vehicle. Power requirements.

Based on the same inventive concept, an embodiment of the present application also provides a control device for an EGR valve, as shown in FIG. 7 , the device includes:

The temperature judging module 701 is used to determine whether the current exhaust gas temperature is less than the first calibration value when the engine is in the backward dragging condition;

The first EGR valve control module 702 is configured to increase the opening of the EGR valve according to a preset range when the current exhaust gas temperature is lower than the first calibration value, otherwise keep closing the EGR valve;

The demand detection module 703 is used to determine whether the current power demand is satisfied according to the current driving state when the throttle demand is detected after the EGR valve opening is increased according to the preset range;

In one or more embodiments, the demand detection module determines whether the current power demand is met according to the current driving state, including:

According to at least one of the current accelerator state value, slope value, and acceleration, it is determined whether the current power demand is met.

In one or more embodiments, the throttle state value includes throttle speed and throttle opening, and the demand detection module determines whether the current power demand is met according to the current throttle state value, including:

Judging whether the current throttle speed is greater than the second calibration value, and whether the current throttle opening is greater than the third calibration value;

When the current throttle speed is greater than the second calibration value and the current throttle opening is greater than the third calibration value, it is determined that the current power demand is not met.

In one or more embodiments, the demand detection module determines whether the current power demand is met according to the current gradient value, including:

calculating the current slope value based on the original slope signal collected by the sensor, and judging whether the current slope value is greater than the fourth calibration value;

When the current slope value is greater than the fourth calibration value, it is determined that the current power demand is not met.

In one or more embodiments, the demand detection module determines whether the power demand is currently met according to the current acceleration, including:

judging whether the current vehicle acceleration is less than the fifth calibration value;

When the current vehicle acceleration is less than the fifth calibration value, it is determined that the current power demand is not met.

In one or more embodiments, the demand detection module determines whether the current power demand is met according to at least two of the current accelerator state value, slope value, and acceleration, wherein:

The priority of determining whether the current power demand is met according to the current throttle state value is higher than that of determining whether the current power demand is met according to the current slope value;

The priority of determining whether the current power demand is met according to the current slope value is higher than that of determining whether the current power demand is met according to the current acceleration.

The second EGR valve control module 704 is configured to close the EGR valve when it is determined according to the current driving state that the current power demand is not met.

In one or more embodiments, the second EGR valve control module maintains the current EGR valve opening degree when determining that the current power demand is met according to the current driving state.

Based on the same inventive concept, the present application also provides a control device 800 of an EGR valve, as shown in FIG. The memory stores instructions executable by the at least one processor, the instructions are executed by the at least one processor to enable the at least one processor to perform the above-mentioned method of EGR valve control.

The memory 801 is used to store programs. Specifically, the program may include program code, and the program code includes computer operation instructions. The memory 801 can be a volatile memory (volatile memory), such as a random-access memory (random-access memory, RAM for short); it can also be a non-volatile memory (non-volatile memory), such as a flash memory (flash memory) ), a hard disk drive (hard disk drive, referred to as HDD) or a solid-state drive (solid-state drive, referred to as SSD); it can also be a combination of any one or more of the above-mentioned volatile memory and non-volatile memory.

The processor 802 may be a central processing unit (central processing unit, CPU for short), a network processor (network processor, NP for short), or a combination of CPU and NP. It may also be a hardware chip. The aforementioned hardware chip may be an application-specific integrated circuit (application-specific integrated circuit, ASIC for short), a programmable logic device (programmable logic device, PLD for short), or a combination thereof. The above-mentioned PLD may be a complex programmable logic device (complex programmable logic device, CPLD for short), a field-programmable gate array (field-programmable gate array, FPGA for short), a generic array logic (generic array logic, GAL for short) or any combination.

Based on the same inventive concept, an embodiment of the present application provides a computer program medium, the computer storage medium stores a computer program, and the computer program is used to make a computer execute the above-mentioned EGR valve control method.

The above-mentioned storage medium may be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) and the like.

The technical solutions provided by this application have been introduced in detail above. In this application, specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of this application. At the same time, for those skilled in the art, based on the idea of this application, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the application.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It should be understood that it can be instructed by a computer program. Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application may adopt one or more computer-usable storage media containing computer-usable program code therein (to realize each process and/or block in the flowchart and/or block diagram, and The combination of flow and/or block.These computer program instructions can be provided to the processor of general purpose computer, special purpose computer, embedded processing machine or other programmable data processing equipment to produce a machine, make through computer or other programmable data The instructions executed by the processor of the processing device generate means for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. A method of controlling EGR valve, the method comprising:

when the engine is determined to be in a reverse driving working condition, judging whether the current exhaust temperature is smaller than a first calibration value or not;

when the current exhaust temperature is determined to be smaller than a first calibration value, the opening of the EGR valve is increased according to a preset amplitude, otherwise, the EGR valve is kept closed;

after the opening of the EGR valve is increased according to a preset amplitude, determining whether the power requirement is met currently according to the current running state when the throttle requirement is detected;

and closing the EGR valve when the current running state determines that the power requirement is not met currently.

2. The method of claim 1, wherein determining whether the power demand is currently met based on the current driving state comprises:

and determining whether the power requirement is met currently according to at least one of the current throttle state value, the gradient value and the acceleration.

3. The method of claim 2, wherein the throttle status value comprises a throttle rate, a throttle opening, and determining whether the power demand is currently met based on the current throttle status value comprises:

judging whether the current accelerator speed is greater than a second calibration value and whether the current accelerator opening is greater than a third calibration value;

and when the current accelerator speed is greater than the second calibration value and the current accelerator opening is greater than the third calibration value, determining that the power requirement is not met currently.

4. The method of claim 2, wherein determining whether the power demand is currently met based on the current grade value comprises:

calculating a current gradient value based on an original gradient signal acquired by a sensor, and judging whether the current gradient value is larger than a fourth calibration value;

and when the current gradient value is greater than the fourth calibration value, determining that the power requirement is not met currently.

5. The method of claim 2, wherein determining whether the power demand is currently met based on the current acceleration comprises:

judging whether the current vehicle acceleration is smaller than a fifth calibration value;

when the current vehicle acceleration is less than the fifth calibrated value, it is determined that the power demand is not currently satisfied.

6. The method according to any one of claims 1 to 5, further comprising:

and when the current power demand is determined to be met according to the current running state, maintaining the current opening degree of the EGR valve.

7. The method of claim 2, wherein determining whether the power demand is currently met is based on at least two of a current throttle state value, a grade value, and an acceleration, wherein:

determining whether the priority of the power demand is met currently according to the current throttle state value, and determining whether the power demand is met currently according to the current gradient value;

and determining whether the priority of the power demand is met currently according to the current gradient value, and determining whether the power demand is met currently according to the current acceleration.

8. A control device for an EGR valve, comprising:

the temperature judging module is used for judging whether the current exhaust temperature is smaller than a first calibration value when the engine is in a reverse-dragging working condition;

the first EGR valve control module is used for increasing the opening of the EGR valve according to a preset amplitude when the current exhaust temperature is determined to be smaller than a first calibration value, otherwise, the EGR valve is kept closed;

the demand detection module is used for determining whether the power demand is met currently according to the current running state when the throttle demand is detected after the opening of the EGR valve is increased according to the preset amplitude;

and the second EGR valve control module is used for closing the EGR valve when the current running state determines that the power requirement is not met currently.

9. A control device of an EGR valve, characterized by comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.

10. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-7.

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