CN115217646B

CN115217646B - Exhaust gas recirculation valve control method, device and storage medium

Info

Publication number: CN115217646B
Application number: CN202111136593.0A
Authority: CN
Inventors: 李子清; 张旭; 董春艳; 林承伯
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2024-03-15
Anticipated expiration: 2041-09-27
Also published as: CN115217646A

Abstract

The invention discloses an exhaust gas recirculation valve control method, an exhaust gas recirculation valve control device and a storage medium, wherein the method comprises the following steps: after the vehicle is electrified, determining the temperature of cooling liquid of a motor cooling system on the vehicle, determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the cooling liquid of the motor cooling system, and if the exhaust gas recirculation valve needs to be iced, controlling the exhaust gas recirculation valve to complete the iced operation; according to the invention, the temperature of the cooling liquid of the motor cooling system is used for judging the ice breaking of the exhaust gas recirculation valve, so that the ice breaking operation of the exhaust gas recirculation valve is controlled, the burning of the exhaust gas recirculation valve caused by the ice formation of the exhaust gas recirculation valve can be reduced, and the failure rate of the exhaust gas recirculation valve is reduced.

Description

Exhaust gas recirculation valve control method, device and storage medium

Technical Field

The present invention relates to the field of exhaust gas recirculation system control, and in particular, to an exhaust gas recirculation valve control method, an exhaust gas recirculation valve control device, and a storage medium.

Background

To avoid excessive temperatures in Exhaust Gas Recirculation (EGR) EGR systems, conventional EGR system control schemes typically provide an external cooler and then introduce cooling water from the engine cooling system to the EGR cooler to cool the high temperature gases in the EGR system. However, the cooling scheme of the EGR system has obvious defects, such as higher temperature of cooling water of the engine, so that the temperature of cooled EGR gas is higher, which is unfavorable for improving the air intake charge coefficient of the engine. Thus, new cooling schemes for EGR systems have emerged, whereby the coolant in the motor cooling circuit is introduced into the EGR cooler, and the coolant through the motor cooling circuit reduces the gas temperature (EGR gas) of the EGR system. However, when the novel cooling scheme of the EGR system is used, a large amount of condensate is generated and stored in the air outlet chamber of the EGR valve, so that the EGR valve is easy to freeze, when the EGR valve works, the EGR valve may be jammed due to freezing, so that the working current is increased, the ablation of the EGR valve is possibly caused, and the failure rate of the EGR valve is improved.

Disclosure of Invention

The invention provides a control method, a device and a storage medium of an exhaust gas recirculation valve, which are used for solving the problems that in the prior art, an EGR valve is easy to freeze to cause ablation of the EGR valve and the failure rate of the EGR valve is improved due to lower temperature of cooling liquid of a motor cooling loop.

There is provided an exhaust gas recirculation valve control method including:

after the vehicle is electrified, determining the temperature of cooling liquid of a motor cooling system on the vehicle;

determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of cooling liquid of the motor cooling system;

and if the exhaust gas recirculation valve needs to be iced, controlling the exhaust gas recirculation valve to finish the iced operation.

Further, controlling the EGR valve to complete the icebreaking operation includes:

controlling the exhaust gas recirculation valve to execute an ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve meets the target requirement;

if the opening degree of the exhaust gas recirculation valve meets the target requirement, determining that the ice breaking of the exhaust gas recirculation valve is completed, and stopping executing the ice breaking operation;

and if the opening degree of the exhaust gas recirculation valve does not meet the target requirement, repeating the ice breaking operation until the opening degree of the exhaust gas recirculation valve meets the target requirement or until the number of times of executing the ice breaking operation is larger than the preset number of times.

Further, controlling the exhaust gas recirculation valve to perform an ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve meets a target demand includes:

controlling the valve body of the exhaust gas recirculation valve to rotate in the direction of increasing the opening degree by using a first preset duty ratio, and recording the first opening degree of the exhaust gas recirculation valve when the valve body rotates to a first preset duration;

after a preset interval after rotation, controlling the valve body of the exhaust gas recirculation valve to rotate towards the direction of reducing the opening degree by using a second preset duty ratio, and recording the second opening degree of the exhaust gas recirculation valve when the valve body rotates to a second preset duration;

determining whether the first opening is smaller than a first preset opening or not, and determining whether the second opening is larger than a second preset opening or not;

if the first opening is smaller than the first preset opening or the second opening is larger than the second preset opening, determining that the opening of the exhaust gas recirculation valve does not meet the target requirement;

and if the first opening is larger than or equal to the first preset opening and the second opening is smaller than or equal to the second preset opening, determining that the opening of the exhaust gas recirculation valve meets the target requirement.

Further, determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to a coolant temperature of the motor cooling system includes:

Determining an ambient temperature of an environment in which the vehicle is located;

determining whether the exhaust gas recirculation valve needs to be subjected to icing check according to the temperature of the cooling liquid and the ambient temperature;

and if the icing check is needed to be carried out on the exhaust gas recirculation valve, controlling the exhaust gas recirculation valve to execute an icing check strategy so as to determine whether the icing check is needed to be carried out on the exhaust gas recirculation valve according to the icing check result.

Further, controlling the EGR valve to execute an icing check strategy to determine whether the EGR valve needs to be iced according to the icing check result, comprising:

controlling the valve body of the exhaust gas recirculation valve to rotate in the direction of increasing the opening degree by using a third preset duty ratio, and recording the third opening degree of the exhaust gas recirculation valve when the valve body rotates to a third preset duration;

determining whether the third opening is smaller than a third preset opening, wherein the third preset opening is larger than the first preset opening;

and if the third opening degree is smaller than the third preset opening degree, determining that the exhaust gas recirculation valve needs to be iced.

Further, after determining whether the third opening is smaller than the third preset opening, the method further includes:

if the third opening is larger than or equal to the first preset opening, controlling the valve body of the exhaust gas recirculation valve to rotate in the direction of reducing the opening by a fourth preset duty ratio, and recording the fourth opening of the exhaust gas recirculation valve when the valve body rotates to a fourth preset duration;

Determining whether the fourth opening degree is larger than a fourth preset opening degree;

if the fourth opening degree is larger than the fourth preset opening degree, determining that the exhaust gas recirculation valve needs to be iced;

and if the fourth opening degree is smaller than or equal to the fourth preset opening degree, determining that the exhaust gas recirculation valve does not need to be iced.

Further, determining whether an icing check for the EGR valve is required based on the coolant temperature and the ambient temperature, comprising:

determining whether the temperature of the cooling liquid is greater than a first preset temperature and determining whether the ambient temperature is greater than a second preset temperature;

if the temperature of the cooling liquid is less than or equal to the first preset temperature and the ambient temperature is less than or equal to the second preset temperature, determining that the exhaust gas recirculation valve needs to be subjected to icing inspection;

if the coolant temperature is greater than the first preset temperature, or the ambient temperature is greater than the second preset temperature, it is determined that no icing check of the EGR valve is required.

There is provided an exhaust gas recirculation valve control apparatus including:

the first determining module is used for determining the temperature of cooling liquid of a motor cooling system on the vehicle after the vehicle is electrified;

the second determining module is used for determining whether the exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the cooling liquid of the motor cooling system;

And the control module is used for controlling the EGR valve to finish the ice breaking operation if the EGR valve needs to break ice.

There is provided an exhaust gas recirculation valve control apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor executing the computer program to perform the steps of the above exhaust gas recirculation valve control method.

A readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above-described egr valve control method.

In one scheme provided by the method, the device and the storage medium for controlling the exhaust gas recirculation valve, after the vehicle is electrified, the temperature of the cooling liquid of the motor cooling system on the vehicle is determined, then whether the exhaust gas recirculation valve on the vehicle needs to be iced or not is determined according to the temperature of the cooling liquid of the motor cooling system, and if the exhaust gas recirculation valve needs to be iced, the exhaust gas recirculation valve is controlled to complete the iced breaking operation; according to the invention, the temperature of the cooling liquid of the motor cooling system is used for judging the ice breaking of the exhaust gas recirculation valve, so that the ice breaking operation of the exhaust gas recirculation valve is controlled, the burning of the exhaust gas recirculation valve caused by the ice formation of the exhaust gas recirculation valve can be reduced, and the failure rate of the exhaust gas recirculation valve is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an EGR valve control system in accordance with an embodiment of the present invention;

FIG. 2 is a schematic flow chart of an EGR valve control method in accordance with one embodiment of the present invention;

FIG. 3 is a flowchart illustrating an implementation of step S30 in FIG. 2;

FIG. 4 is a schematic diagram of an EGR valve control device in accordance with an embodiment of the present invention;

fig. 5 is a schematic diagram showing another construction of an egr valve control device according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The exhaust gas recirculation valve control method provided by the embodiment of the invention can be applied to an exhaust gas recirculation valve control system shown in fig. 1, wherein the exhaust gas recirculation valve control system comprises a motor cooling system 101, an exhaust gas recirculation valve 102 and an exhaust gas recirculation valve control device 103 on a vehicle. In the vehicle, a coolant of the motor cooling system is introduced into the exhaust gas recirculation cooler, and the coolant passing through the motor cooling circuit reduces the gas temperature of the exhaust gas recirculation system. Wherein an exhaust gas recirculation valve in the exhaust gas recirculation system communicates with the exhaust gas recirculation valve control device via a vehicle bus.

After the vehicle is electrified, the exhaust gas recirculation valve control device determines the temperature of cooling liquid of a motor cooling system on the vehicle, then determines whether the exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the cooling liquid of the motor cooling system, and if the exhaust gas recirculation valve needs to be iced, controls the exhaust gas recirculation valve to complete the iced operation. The cooling liquid temperature of the motor cooling system is used for carrying out ice breaking judgment on the exhaust gas recirculation valve, so that the exhaust gas recirculation valve is controlled to complete ice breaking operation, the burning of the exhaust gas recirculation valve caused by freezing of the exhaust gas recirculation valve can be reduced, the failure rate of the exhaust gas recirculation valve is reduced, and the normal operation of the exhaust gas recirculation system is ensured.

The exhaust gas recirculation valve control device may be an electronic control unit (Electronic Control Unit, ECU) on the vehicle, or may be other control devices on the vehicle, which will not be described herein.

The exhaust gas recirculation valve control system includes a motor cooling system, an exhaust gas recirculation valve, and an exhaust gas recirculation valve control device, which are only exemplary, and in other embodiments, the exhaust gas recirculation valve control system further includes other devices, such as various sensors, which are not described herein.

In one embodiment, as shown in fig. 2, an exhaust gas recirculation valve control method is provided, and the exhaust gas recirculation valve control apparatus of fig. 1 is used as an example, and includes the following steps:

s10: after the vehicle is powered up, a coolant temperature of a motor cooling system on the vehicle is determined.

After the vehicle is powered up, the coolant temperature of the on-board motor cooling system needs to be determined to implement a subsequent control strategy. The temperature of the cooling liquid of the motor cooling system can be acquired by a temperature sensor arranged in the motor cooling system.

S20: and determining whether the exhaust gas recirculation valve needs to be iced according to the temperature of the cooling liquid of the motor cooling system.

In this embodiment, the coolant of the motor cooling system in the vehicle is introduced into the exhaust gas recirculation cooler, and the coolant passing through the motor cooling circuit reduces the gas temperature of the exhaust gas recirculation system. In the practical use process, the temperature of the cooling liquid with too low temperature enters the EGR cooler, so that the temperature of the exhaust gas discharged from the EGR cooler is generally lower than the dew point temperature (about 54 ℃) of the EGR gas, a large amount of condensate is generated and stored in an exhaust gas outlet chamber of the EGR valve, the EGR valve can be frozen and blocked, when the EGR valve works, working current is increased due to blocking caused by freezing, and the EGR valve is ablated, so that the EGR valve is broken down.

Therefore, in order to avoid a failure caused by icing of the exhaust gas recirculation valve in the exhaust gas recirculation system, it is necessary to obtain the temperature of the coolant of the motor cooling system on the vehicle after the vehicle is powered on, so as to determine whether the exhaust gas recirculation valve is likely to be iced according to the temperature of the coolant of the motor cooling system, and then check the exhaust gas recirculation valve according to the determination result to determine whether the exhaust gas recirculation valve needs to be iced.

For example, if the temperature of the coolant in the motor cooling system is below a certain threshold, which indicates that the egr valve may freeze, the egr valve needs to be broken to avoid the egr valve from being burned due to freezing and jamming. In other embodiments, the temperature of the cooling liquid of the motor cooling system and other influencing factors may be combined and judged to determine whether the exhaust gas recirculation valve needs to be iced to ensure the accuracy of the judgment result, which is not described herein.

S30: and if the exhaust gas recirculation valve needs to be iced, controlling the exhaust gas recirculation valve to finish the iced operation.

After determining whether the ice breaking of the exhaust gas recirculation valve on the vehicle is required according to the temperature of the cooling liquid of the motor cooling system, if the ice breaking of the exhaust gas recirculation valve is determined to be required, the ice breaking mode of the exhaust gas recirculation valve is entered if the ice breaking of the exhaust gas recirculation valve is determined to be required, and the ice breaking operation of the exhaust gas recirculation valve is controlled to be completed, so that the possibility of failure of the exhaust gas recirculation valve is reduced.

After determining whether the ice breaking of the exhaust gas recirculation valve on the vehicle is required according to the temperature of the cooling liquid of the motor cooling system, if the ice breaking of the exhaust gas recirculation valve is not required, the exhaust gas recirculation valve is not frozen, the ice breaking of the exhaust gas recirculation valve is not required, and the normal mode can be entered, and a conventional exhaust gas recirculation valve control strategy is used, so that the exhaust gas recirculation valve and the exhaust gas recirculation valve system work normally.

In this embodiment, after the vehicle is powered on, the temperature of the cooling liquid of the motor cooling system on the vehicle is determined, then, according to the temperature of the cooling liquid of the motor cooling system, whether the exhaust gas recirculation valve on the vehicle needs to be iced or not is determined, and if the exhaust gas recirculation valve needs to be iced, the exhaust gas recirculation valve is controlled to complete the iced operation. The cooling liquid temperature of the motor cooling system is used for carrying out ice breaking judgment on the exhaust gas recirculation valve, so that the exhaust gas recirculation valve is controlled to complete ice breaking operation, the burning of the exhaust gas recirculation valve caused by freezing of the exhaust gas recirculation valve can be reduced, the failure rate of the exhaust gas recirculation valve is reduced, and the normal operation of the exhaust gas recirculation system is ensured.

In one embodiment, as shown in fig. 3, in step S30, the exhaust gas recirculation valve is controlled to complete the ice breaking operation, which specifically includes the following steps:

s31: the exhaust gas recirculation valve is controlled to perform an ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve satisfies a target demand.

After determining that the exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the cooling liquid of the motor cooling system, controlling the exhaust gas recirculation valve to execute the icebreaking operation so as to determine whether the opening degree of the exhaust gas recirculation valve meets the target requirement.

Wherein the icebreaking operation is an operation of controlling the valve body of the exhaust gas recirculation valve to mechanically open and close, and each icebreaking operation comprises at least one valve body opening and at least one closing operation. The mechanical opening and closing of the exhaust gas recirculation valve are controlled to realize the mechanical icebreaking of the exhaust gas recirculation valve.

S32: if the opening degree of the exhaust gas recirculation valve meets the target requirement, the completion of the ice breaking of the exhaust gas recirculation valve is determined, and the ice breaking operation is stopped.

After the exhaust gas recirculation valve is controlled to execute the ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve meets the target requirement, if the opening degree of the exhaust gas recirculation valve meets the target requirement, which means that the exhaust gas recirculation valve is normally opened and closed and is not affected by icing to generate clamping stagnation, the ice breaking of the exhaust gas recirculation valve is determined to be completed, the ice breaking operation is stopped, the ice breaking mode of the exhaust gas recirculation valve is exited, and the normal mode is entered.

S33: and if the opening degree of the exhaust gas recirculation valve does not meet the target requirement, repeating the ice breaking operation until the opening degree of the exhaust gas recirculation valve meets the target requirement or until the number of times of executing the ice breaking operation is larger than the preset number of times.

After the exhaust gas recirculation valve is controlled to execute the ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve meets the target requirement, which indicates that the opening and the closing of the exhaust gas recirculation valve are abnormal and are also affected by icing to generate clamping stagnation, the ice breaking operation is repeatedly executed until the opening degree of the exhaust gas recirculation valve meets the target requirement or until the number of times of executing the ice breaking operation is larger than the preset number of times. The preset number of times may be set according to the specific situation of the vehicle.

In the process of repeatedly executing the ice breaking operation, the opening degree of the exhaust gas recirculation valve meets the target requirement after the ice breaking operation is found to be executed for a certain time, the opening and the closing of the exhaust gas recirculation valve are normal, the ice breaking operation is stopped after the ice breaking of the exhaust gas recirculation valve is determined to be completed, the ice breaking mode of the exhaust gas recirculation valve is exited, and the normal mode is entered. Meanwhile, in the process of executing the ice breaking operation, if the number of times of executing the ice breaking operation is larger than the preset number of times (for example, 10 times), the ice breaking operation of the exhaust gas recirculation valve cannot be completed after the preset number of times of executing the ice breaking operation, and the normal ice breaking means cannot break the ice of the exhaust gas recirculation valve, so that the ice breaking operation is not required to be executed, the ice breaking mode of the exhaust gas recirculation valve is directly exited, and unnecessary energy consumption is avoided.

In this embodiment, the opening degree of the exhaust gas recirculation valve is determined to meet the target requirement by controlling the exhaust gas recirculation valve to perform the ice breaking operation, and if the opening degree of the exhaust gas recirculation valve meets the target requirement, the ice breaking operation of the exhaust gas recirculation valve is determined to be completed and the ice breaking operation is stopped; if the opening degree of the exhaust gas recirculation valve does not meet the target requirement, repeatedly executing the ice breaking operation until the opening degree of the exhaust gas recirculation valve meets the target requirement, or until the number of times of executing the ice breaking operation is larger than the preset number of times, determining a specific process of controlling the exhaust gas recirculation valve to complete the ice breaking operation, and stopping executing the ice breaking operation when the number of times of executing the ice breaking operation is larger than the preset number of times, so that frequent ice breaking operation of the exhaust gas recirculation valve is avoided, and unnecessary energy consumption waste can be reduced.

In an embodiment, after the number of times of executing the ice breaking operation is greater than the preset number of times, the ice breaking mode of the exhaust gas recirculation valve is directly exited, and the function of the exhaust gas recirculation valve is required to be closed, so that the burning and melting caused by freezing and clamping stagnation during the operation of the subsequent exhaust gas recirculation valve are avoided, and the replacement cost of parts is reduced. Meanwhile, after the number of times of executing the ice breaking operation is greater than the preset number of times, a fault prompt of the exhaust gas recirculation valve is sent to a user, a fault code is reported, and the actual diagnosis frequency (IUPR) of the current driving cycle is added by 1, namely the diagnosis molecule iupr+1 of the current driving cycle, so that the subsequent user can perform fault maintenance on the exhaust gas recirculation valve.

In one embodiment, in step S31, the exhaust gas recirculation valve is controlled to perform an ice breaking operation to determine whether the opening degree of the exhaust gas recirculation valve meets the target requirement, which specifically includes the following steps:

s311: and controlling the valve body of the exhaust gas recirculation valve to rotate in the opening increasing direction by a first preset duty ratio, and recording the first opening of the exhaust gas recirculation valve when the valve body rotates to a first preset duration.

After determining that ice breaking is required to be performed on an exhaust gas recirculation valve on a vehicle according to the temperature of cooling liquid of a motor cooling system, controlling a valve body of the exhaust gas recirculation valve to move in a direction of increasing the opening by a first preset duty ratio, and recording the first opening of the exhaust gas recirculation valve when the motor cooling system rotates for a first preset period of time. The method comprises the steps of controlling a valve body of an exhaust gas recirculation valve to rotate in a direction of opening increase (namely, to rotate in an opening direction) from a closing position of the exhaust gas recirculation valve with a first preset duty ratio so as to control the opening of the exhaust gas recirculation valve to increase, stopping until the rotating time reaches a first preset time, and recording the first opening of the exhaust gas recirculation valve when the exhaust gas recirculation valve rotates to the first preset time.

S312: and after a preset interval after the rotation, controlling the valve body of the exhaust gas recirculation valve to rotate towards the direction of reducing the opening degree by using a second preset duty ratio, and recording the second opening degree of the exhaust gas recirculation valve when the valve body rotates to a second preset duration.

After the first opening of the exhaust gas recirculation valve is recorded when the first preset time period is increased, after the preset interval is passed after the rotation, the valve body of the exhaust gas recirculation valve is controlled to rotate towards the direction of reducing the opening by a second preset duty ratio, and the second opening of the exhaust gas recirculation valve when the second preset time period is rotated is recorded. After the valve body of the exhaust gas recirculation valve is controlled to rotate in the opening increasing direction by the first preset duty ratio, a period of time is needed (a first preset interval is stopped), and then the exhaust gas recirculation valve is controlled to rotate in the closing direction from the first opening position by the second preset duty ratio, so that the opening of the exhaust gas recirculation valve is controlled to be reduced, the exhaust gas recirculation valve is stopped until the rotating time reaches a second preset time, and the second opening of the exhaust gas recirculation valve when the exhaust gas recirculation valve rotates to the second preset time is recorded. In this embodiment, after the opening degree of the exhaust gas recirculation valve is controlled to be increased, after a first preset interval is needed, the opening degree of the exhaust gas recirculation valve is controlled to be reduced, so that the inertia of rotation of the exhaust gas recirculation valve is reduced, the damage to the exhaust gas recirculation valve caused by frequent control is reduced, the stability of the action of the exhaust gas recirculation valve is ensured, and the accuracy of the second opening degree is further ensured.

The first preset duty ratio and the second preset duty ratio are duty ratios calibrated in advance according to actual requirements. The first preset duty cycle and the second preset duty cycle may be the same or different. The first preset time length and the second preset time length are both time lengths calibrated in advance according to actual demands, and the first preset time length and the second preset time length can be the same or different.

It should be appreciated that the duty cycle may be used to pulse width modulate a voltage signal at a frequency applied to the egr valve, i.e., by adjusting the duty cycle of the egr valve, precise and continuous control of the operating condition of the egr valve may be achieved. In this embodiment, the larger the preset duty ratio is, the larger the mechanical icebreaking force of the exhaust gas recirculation valve is, and the better the icebreaking effect is. In order to ensure that the exhaust gas recirculation valve can mechanically break ice with maximum force and ensure the ice breaking effect, the preset duty ratio can be set to be 100%.

For example, the first preset duty ratio and the second preset duty ratio are both 100%, the first preset duration and the second preset duration are both 0.1s, the first preset interval is 0.1s, then the valve body of the exhaust gas recirculation valve is controlled to move in the direction of increasing the opening degree by the duty ratio of 100%, until the movement duration is 0.1s, and the first opening degree after moving in the direction of increasing the opening degree for 0.1s is recorded; stopping for 0.1s, and then controlling the valve body of the exhaust gas recirculation valve to move in the opening decreasing direction with a duty ratio of 100 percent until the movement time is 0.1s, and recording a second opening after moving in the opening decreasing direction for 0.1 s.

In this embodiment, the first preset duty ratio and the second preset duty ratio are both 100%, the first preset duration and the second preset duration are both 0.1s, and the first preset interval is 0.1s, which are only illustrative, and in other embodiments, the first preset duty ratio and the second preset duty ratio may also be other duty ratios, the first preset duration and the second preset duration may also be other durations, and the first preset interval may also be other interval values, which are not described herein.

S313: determining whether the first opening is smaller than a first preset opening or not, and determining whether the second opening is larger than a second preset opening or not.

After the first opening degree and the second opening degree of the exhaust gas recirculation valve are recorded, determining whether the first opening degree is smaller than a first preset opening degree, and determining whether the second opening degree is larger than a second preset opening degree, so as to determine whether the opening degree of the exhaust gas recirculation valve meets target requirements according to a judging result.

S314: and if the first opening is smaller than the first preset opening or the second opening is larger than the second preset opening, determining that the opening of the exhaust gas recirculation valve does not meet the target requirement.

After determining whether the first opening is smaller than the first preset opening, if the first opening is smaller than the first preset opening, it indicates that the exhaust gas recirculation valve fails to reach the first preset opening within a first preset time period, it indicates that the exhaust gas recirculation valve has ice and is jammed, it determines that the opening of the exhaust gas recirculation valve does not meet the target requirement, the ice breaking is unsuccessful, and the steps S211 to S312 need to be continuously and circularly performed to continuously perform the ice breaking operation for mechanically breaking ice until the opening of the exhaust gas recirculation valve does not meet the target requirement, or the number of times of performing the ice breaking operation is greater than the preset number.

After determining whether the second opening is greater than the second preset opening, if the second opening is greater than the second preset opening, it indicates that the exhaust gas recirculation valve fails to reach the second preset opening within the second preset time period, and indicates that the exhaust gas recirculation valve has ice formation and is jammed, if it is determined that the opening of the exhaust gas recirculation valve does not meet the target requirement, the ice breaking is unsuccessful, and the steps S211 to S312 need to be continuously and circularly performed to continuously perform the ice breaking operation for mechanically breaking ice until the opening of the exhaust gas recirculation valve does not meet the target requirement, or the number of times of performing the ice breaking operation is greater than the preset number of times. After each cycle of steps S211 to S312, the exhaust gas recirculation valve can be recycled after a preset interval is needed to ensure the stability of the exhaust gas recirculation valve, thereby reducing the rotation error and further ensuring the accuracy of the opening degree.

The first preset opening and the second preset opening are openings calibrated in advance according to actual requirements. The first preset opening degree needs to be larger than the maximum opening degree of the exhaust gas recirculation valve when the exhaust gas recirculation valve works normally on the whole vehicle, the second preset opening degree needs to be far smaller than the maximum opening degree of the exhaust gas recirculation valve when the exhaust gas recirculation valve works normally on the whole vehicle, and the second preset opening degree can be set to be smaller than 10%. For example, when the exhaust gas recirculation valve works normally on the whole vehicle, the maximum opening is 80%, the first preset opening needs to be greater than 80%, and the second preset opening needs to be less than 00%, so as to ensure that ice can be broken quickly.

For example, after the first opening and the second opening of the exhaust gas recirculation valve are recorded, if the first opening is smaller than 90% or the second opening is larger than 1%, which indicates that the exhaust gas recirculation valve is frozen and is stuck, it is determined that the opening of the exhaust gas recirculation valve does not meet the target requirement, the opening of the exhaust gas recirculation valve is not successfully iced, and the icebreaking operation needs to be continuously performed to mechanically break the ice.

S315: and if the first opening is larger than or equal to the first preset opening and the second opening is smaller than or equal to the second preset opening, determining that the opening of the exhaust gas recirculation valve meets the target requirement.

After determining whether the first opening is smaller than a first preset opening and determining whether the second opening is larger than a second preset opening, if the first opening is larger than or equal to the first preset opening and the second opening is smaller than or equal to the second preset opening, the fact that the exhaust gas recirculation valve reaches the first preset opening within a first preset duration and the exhaust gas recirculation valve reaches the second preset opening within a second preset duration is indicated that the exhaust gas recirculation valve has no icing and is blocked is determined, the opening of the exhaust gas recirculation valve meets target requirements, and the exhaust gas recirculation valve is successful in icebreaking.

In the embodiment, the valve body of the exhaust gas recirculation valve is controlled to rotate in the direction of increasing the opening degree by a first preset duty ratio, and the first opening degree of the exhaust gas recirculation valve when the valve body rotates to a first preset duration is recorded; after a preset interval after rotation, controlling the valve body of the exhaust gas recirculation valve to rotate towards the direction of reducing the opening degree by using a second preset duty ratio, and recording the second opening degree of the exhaust gas recirculation valve when the valve body rotates to a second preset duration; determining whether the first opening is smaller than a first preset opening or not, and determining whether the second opening is larger than a second preset opening or not; if the first opening is smaller than the first preset opening or the second opening is larger than the second preset opening, determining that the opening of the exhaust gas recirculation valve does not meet the target requirement; if the first opening is greater than or equal to the first preset opening and the second opening is less than or equal to the second preset opening, determining that the opening of the exhaust gas recirculation valve meets the target requirement, determining that the exhaust gas recirculation valve executes the ice breaking operation to determine whether the opening of the exhaust gas recirculation valve meets the specific process of the target requirement, and mechanically opening and closing the valve body of the exhaust gas recirculation valve by controlling the valve body of the exhaust gas recirculation valve to realize quick ice breaking of the exhaust gas recirculation valve and increase the ice breaking efficiency.

In one embodiment, in step S20, that is, according to the temperature of the cooling fluid in the motor cooling system, it is determined whether the exhaust gas recirculation valve on the vehicle needs to be iced, which specifically includes the following steps:

s21: an ambient temperature of an environment in which the vehicle is located is determined.

After the vehicle is powered up, it is also necessary to determine the ambient temperature of the environment in which the vehicle is located, while determining the temperature of the coolant of the motor cooling system on the vehicle.

Wherein the ambient temperature may be acquired by a temperature sensor mounted outside the vehicle.

S22: based on the coolant temperature and the ambient temperature, it is determined whether an icing check of the EGR valve is required.

After determining the coolant temperature of the motor cooling system and determining the ambient temperature, it is determined whether an icing check of the exhaust gas recirculation valve is required based on the coolant temperature and the ambient temperature.

S23: and if the icing check is needed to be carried out on the exhaust gas recirculation valve, controlling the exhaust gas recirculation valve to execute an icing check strategy so as to determine whether the icing check is needed to be carried out on the exhaust gas recirculation valve according to the icing check result.

After determining whether the exhaust gas recirculation valve needs to be subjected to icing inspection according to the temperature of the cooling liquid and the ambient temperature, if the determination that the exhaust gas recirculation valve needs to be subjected to icing inspection indicates that the exhaust gas recirculation valve may be subjected to icing under the temperature environment, controlling the exhaust gas recirculation valve to execute an icing inspection strategy so as to determine whether the exhaust gas recirculation valve needs to be subjected to icing inspection according to the icing inspection result. If it is determined that the exhaust gas recirculation valve does not need to be subjected to icing inspection, which means that the exhaust gas recirculation valve does not have icing phenomenon in the temperature environment, the icing inspection is not needed, and further the icebreaking operation is not needed, so that frequent icebreaking operation is reduced.

After the temperature condition meets a certain condition, the freezing inspection is carried out, so that whether the exhaust gas recirculation valve is frozen or not can be accurately judged, frequent ice breaking caused by direct ice breaking after the temperature condition meets a certain condition is avoided, and the accuracy of subsequent ice breaking operation is ensured. In addition, under some working conditions, the temperature of the cooling liquid of the motor cooling system may be lower, but if the temperature of the environment where the vehicle is located is higher at this time, the exhaust gas recirculation valve may not be frozen, so that both the ambient temperature and the temperature of the cooling liquid of the motor cooling system are used as influencing factors to determine whether the exhaust gas recirculation valve needs to be checked for freezing, frequent ice breaking judgment caused by that the temperature of the cooling liquid of the motor cooling system is reduced to a certain threshold value is reduced, the accuracy of judgment is further improved, and the processing amount and the system operation required by frequent ice breaking inspection are further reduced.

In this embodiment, the environmental temperature of the environment where the vehicle is located is determined, whether the exhaust gas recirculation valve needs to be subjected to icing inspection is determined according to the temperature of the cooling liquid and the environmental temperature, if the exhaust gas recirculation valve needs to be subjected to icing inspection, the exhaust gas recirculation valve is controlled to execute an icing inspection strategy, whether the exhaust gas recirculation valve needs to be subjected to ice breaking is determined according to the icing inspection result, the specific step of determining whether the exhaust gas recirculation valve on the vehicle needs to be subjected to ice breaking according to the temperature of the cooling liquid of the motor cooling system is clarified, the accuracy of judgment is improved, frequent ice breaking is avoided, and the accuracy of subsequent ice breaking operation is ensured.

In one embodiment, in step S22, it is determined whether the exhaust gas recirculation valve needs to be checked for icing according to the coolant temperature and the ambient temperature, which specifically includes the following steps:

s221: determining whether the temperature of the cooling liquid is greater than a first preset temperature and determining whether the ambient temperature is greater than a second preset temperature.

After determining the coolant temperature of the motor cooling system and the ambient temperature of the environment in which the vehicle is located, determining whether the coolant temperature of the motor cooling system is greater than a first preset temperature, and determining whether the ambient temperature is greater than a second preset temperature.

S222: if the temperature of the cooling liquid is less than or equal to the first preset temperature and the ambient temperature is less than or equal to the second preset temperature, it is determined that the exhaust gas recirculation valve needs to be checked for icing.

After determining whether the temperature of the cooling liquid of the motor cooling system is greater than a first preset temperature and determining whether the ambient temperature is greater than a second preset temperature, if the temperature of the cooling liquid of the motor cooling system is less than or equal to the first preset temperature and the ambient temperature is less than or equal to the second preset temperature, the cooling liquid of the motor cooling system is lower, and meanwhile, the ambient temperature of the environment where the vehicle is located is also lower, and the exhaust gas recirculation valve is possibly frozen higher, determining that the exhaust gas recirculation valve needs to be subjected to freezing inspection.

S223: if the coolant temperature is greater than the first preset temperature, or the ambient temperature is greater than the second preset temperature, it is determined that no icing check of the EGR valve is required.

After determining whether the temperature of the cooling liquid of the motor cooling system is greater than a first preset temperature and determining whether the ambient temperature is greater than a second preset temperature, if the temperature of the cooling liquid of the motor cooling system is greater than the first preset temperature, which indicates that the temperature of the cooling liquid of the motor cooling system is not low, the freezing possibility of the exhaust gas recirculation valve is low or even none, and determining that the icing check of the exhaust gas recirculation valve is not needed; or the ambient temperature is greater than the second preset temperature, which indicates that the ambient temperature of the environment in which the vehicle is located is not low and that the freezing of the exhaust gas recirculation valve is likely to be low, it is determined that the freezing check of the exhaust gas recirculation valve is not required.

In this embodiment, the first preset temperature and the second preset temperature are temperatures calibrated according to an actual condition of an exhaust gas recirculation system on a vehicle, and the first preset temperature and the second preset temperature may be the same or different.

For example, the first preset temperature and the second preset temperature may both be 0 ℃, after determining the coolant temperature of the motor cooling system and the environmental temperature of the environment in which the vehicle is located, determining whether the coolant temperature of the motor cooling system is greater than 0 ℃, and determining whether the environmental temperature is greater than 0 ℃, if both the coolant temperature of the motor cooling system and the environmental temperature are less than or equal to 0 ℃, indicating that the exhaust gas recirculation valve may be frozen higher, determining that the exhaust gas recirculation valve needs to be checked for freezing; if either the coolant temperature of the motor cooling system or the ambient temperature is greater than 0 ℃, indicating that the egr valve may be frozen low, it is determined that no check for icing of the egr valve is required.

In this embodiment, the first preset temperature and the second preset temperature may be both 0 ℃, which is only illustrative, and in other embodiments, the first preset temperature and the second preset temperature may also have other temperature values at the same time, and the first preset temperature and the second preset temperature may also have different other temperature values, which are not described herein.

In other embodiments, the determination of whether an icing check for the EGR valve is required may be based on the coolant temperature and the ambient temperature, or may be determined in other ways, such as: firstly, determining whether the temperature of the cooling liquid of the motor cooling system and the temperature of the environment are smaller than a third preset temperature (the third preset temperature can be 0 ℃), further judging the sizes of the temperature of the cooling liquid of the motor cooling system and the temperature of the environment, selecting the temperature with a lower temperature value as a target temperature, determining whether the target temperature is smaller than a fourth preset temperature (the fourth preset temperature is smaller than the third preset temperature), and if the target temperature is smaller than the fourth preset temperature, determining that the exhaust gas recirculation valve needs to be subjected to icing inspection; if the target temperature is greater than or equal to the fourth preset temperature, it is determined that no icing check of the EGR valve is required. When the temperature of the cooling liquid of the motor cooling system and the temperature of the environment are both smaller than a certain threshold value, the lower temperature value is further taken as an unrepresentative value, further threshold value judgment is carried out, and the judgment accuracy is improved.

In this embodiment, whether the temperature of the cooling liquid of the motor cooling system is greater than a first preset temperature and whether the ambient temperature is greater than a second preset temperature are determined, and if the temperature of the cooling liquid is less than or equal to the first preset temperature and the ambient temperature is less than or equal to the second preset temperature, it is determined that the exhaust gas recirculation valve needs to be subjected to icing inspection; if the temperature of the cooling liquid is larger than the first preset temperature or the ambient temperature is larger than the second preset temperature, the fact that the exhaust gas recirculation valve is not required to be subjected to icing inspection is determined, the specific step of determining whether the exhaust gas recirculation valve is required to be subjected to icing inspection according to the temperature of the cooling liquid and the ambient temperature is determined, and on the basis of guaranteeing to consider two temperature factors, the temperature threshold value is judged according to the two temperature factors simultaneously, simplicity and rapidness are achieved, and judging efficiency is improved.

In an embodiment, after the vehicle is powered up, before step S20, i.e. before determining whether the exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the coolant of the motor cooling system, the method further specifically includes the steps of: the exhaust gas recirculation valve control device detects faults of the exhaust gas recirculation valve to determine whether the exhaust gas recirculation valve has faults, and if the exhaust gas recirculation valve has faults, the exhaust gas recirculation valve control device alarms the faults of the exhaust gas recirculation valve, so that a user can acquire the fault condition of the exhaust gas recirculation valve as soon as possible and perform corresponding treatment, and the driving safety is ensured. The vehicle control unit (Vehicle control unit, VCU) is controlled while the exhaust gas recirculation valve is being subjected to fault detection, and a temperature sensor arranged in the motor cooling system and a temperature sensor arranged outside the vehicle are checked to determine whether the two temperature sensors are faulty or not, and if any one of the two temperature sensors is determined to be faulty, the fault temperature sensor is alarmed. Only after determining that the exhaust gas recirculation valve has no fault and determining that both temperature sensors have no fault, the cooling liquid temperature and the environment temperature of the motor cooling system can be obtained, so that icing check judgment is performed according to the cooling liquid temperature and the environment temperature of the motor cooling system, and whether the exhaust gas recirculation valve is iced or not is determined according to the icing check result, thereby ensuring driving safety.

In one embodiment, in step S23, the exhaust gas recirculation valve is controlled to execute an icing check strategy to determine whether the exhaust gas recirculation valve needs to be iced according to the icing check result, which specifically includes the following steps:

s231: and controlling the valve body of the exhaust gas recirculation valve to rotate in the opening increasing direction by a third preset duty ratio, and recording the third opening of the exhaust gas recirculation valve when the valve body rotates to a third preset duration.

After determining that the exhaust gas recirculation valve needs to be subjected to icing inspection, a valve body of the exhaust gas recirculation valve needs to be controlled to rotate in the direction of increasing the opening by a third preset duty ratio, and the third opening of the exhaust gas recirculation valve when the valve body rotates to a third preset duration is recorded, so that whether the exhaust gas recirculation valve is frozen or not is determined according to the size of the third opening.

S232: determining whether the third opening is smaller than a third preset opening.

After controlling the valve body of the exhaust gas recirculation valve to rotate in the direction in which the opening increases with a third preset duty ratio, and recording a third opening of the exhaust gas recirculation valve when the valve body rotates to a third preset time period, determining whether the third opening is smaller than the third preset opening.

S233: and if the third opening degree is smaller than the third preset opening degree, determining that the exhaust gas recirculation valve needs to be iced.

After determining whether the third opening is smaller than the third preset opening, if the third opening is smaller than the third preset opening, which means that the exhaust gas recirculation valve cannot reach the opening under the normal condition quickly, the exhaust gas recirculation valve may be affected by icing to generate jamming, and it is determined that the exhaust gas recirculation valve needs to be iced; if the third opening is greater than or equal to the third preset opening, the opening of the exhaust gas recirculation valve can quickly reach the opening under normal conditions, the exhaust gas recirculation valve is not blocked due to the influence of icing, and the exhaust gas recirculation valve is possibly not iced, so that the exhaust gas recirculation valve is determined to be not iced.

Wherein the third preset opening is larger than the first preset opening. The third preset duty cycle may be 100% to ensure maximum rotational force of the egr valve.

For example, the first preset opening degree is 80%, and the third preset opening degree may be 90%; the third preset duty cycle may be 100 and the third preset duration may be 1s. When the valve body of the exhaust gas recirculation valve is controlled to rotate in the direction of increasing the opening degree by 100% of duty ratio, and the third opening degree of the exhaust gas recirculation valve is recorded when the rotation is carried out for 1s, if the third opening degree reaches (is more than or equal to) 90%, the opening degree of the exhaust gas recirculation valve can quickly reach the opening degree under the normal condition under the maximum rotation force, the exhaust gas recirculation valve is not blocked due to the influence of icing, and the exhaust gas recirculation valve is possibly not frozen, so that the exhaust gas recirculation valve is determined to be unnecessary to break ice; if the third opening degree is not up to (less than) 90%, it indicates that the exhaust gas recirculation valve cannot quickly reach the opening degree under the normal condition even under the maximum rotation force, the exhaust gas recirculation valve may be affected by icing and is jammed, it is determined that the exhaust gas recirculation valve needs to be iced, the valve body of the exhaust gas recirculation valve is controlled to rotate towards the direction of increasing the opening degree through the maximum duty ratio, whether the exhaust gas recirculation valve is iced is determined according to the opening degree in the preset time period, simplicity and rapidness are achieved, the possibility that the preset opening degree cannot be reached in a short time due to insufficient rotation force is reduced, and accuracy of an icing checking result is guaranteed.

In the embodiment, the valve body of the exhaust gas recirculation valve is controlled to rotate in the direction of increasing the opening degree by a third preset duty ratio, and the third opening degree of the exhaust gas recirculation valve when the valve body rotates to a third preset time period is recorded; determining whether the third opening is smaller than a third preset opening, wherein the third preset opening is larger than the first preset opening; if the third opening is smaller than the third preset opening, determining that the exhaust gas recirculation valve needs to be iced, and definitely controlling the exhaust gas recirculation valve to execute an icing check strategy to determine whether the exhaust gas recirculation valve needs to be iced according to the icing check result, and determining whether the exhaust gas recirculation valve is iced according to the opening within the preset duration.

In an embodiment, in step S232, i.e. after determining whether the third opening is smaller than the third preset opening, the method further specifically includes the following steps:

s2321: and if the third opening is larger than or equal to the first preset opening, controlling the valve body of the exhaust gas recirculation valve to rotate in the opening reducing direction by a fourth preset duty ratio, and recording the fourth opening of the exhaust gas recirculation valve when the valve body rotates to a fourth preset duration.

After the valve body of the exhaust gas recirculation valve is controlled to rotate in the opening increasing direction (opening direction) by the third preset duty ratio, the third opening of the exhaust gas recirculation valve when the valve body rotates to the third preset time period is recorded, whether the third opening is smaller than the third preset opening or not is determined, if the third opening is larger than or equal to the first preset opening, the opening of the exhaust gas recirculation valve can quickly reach the opening under the normal condition, the valve body is not blocked due to the influence of icing, the exhaust gas recirculation valve is possibly free from icing, and the condition that the exhaust gas recirculation valve is not required to be iced can be directly determined.

However, the possibility of misjudgment may also be stored, for example, the rotation force is greater due to the larger third preset duty ratio, so that the exhaust gas recirculation valve reaches the preset opening degree without being jammed by icing, and in order to avoid misjudgment caused by the larger rotation force due to the larger third preset duty ratio, the exhaust gas recirculation valve needs to be subjected to reverse rotation control, and further icing judgment is performed again, so as to ensure the accuracy of the icing checking result. Therefore, after determining whether the third opening degree is smaller than the third preset opening degree, if the third opening degree is larger than or equal to the first preset opening degree, the valve body of the exhaust gas recirculation valve is controlled to rotate in the opening degree reducing direction (closing direction) with a fourth preset duty ratio, and the fourth opening degree of the exhaust gas recirculation valve when rotating to a fourth preset time period is recorded.

In this embodiment, in order to further ensure accuracy of icing determination, it is necessary to ensure that rotation forces of the exhaust gas recirculation valve in the icing inspection process are consistent, that is, it is necessary to determine that the third preset duty cycle is the same as the fourth preset duty cycle. The fourth preset duty cycle and the third preset duty cycle may be both 100%.

S2322: and determining whether the fourth opening degree is larger than a fourth preset opening degree.

After controlling the valve body of the exhaust gas recirculation valve to rotate in a direction in which the opening degree decreases with a fourth preset duty ratio and recording a fourth opening degree of the exhaust gas recirculation valve when the rotation is to a fourth preset time period, it is necessary to determine whether the fourth opening degree is greater than the fourth preset opening degree. The fourth preset opening is a pre-calibrated opening, and is far smaller than the third preset opening; the fourth preset opening may be the same as the second preset opening, and the fourth preset opening may be 1%.

S2323: and if the fourth opening degree is larger than the fourth preset opening degree, determining that the exhaust gas recirculation valve needs to be iced.

After determining whether the fourth opening degree is greater than the fourth preset opening degree, if the fourth opening degree is greater than the fourth preset opening degree, the opening degree of the exhaust gas recirculation valve can quickly reach the opening degree under the normal condition, but the opening degree of the exhaust gas recirculation valve cannot quickly reach the closing opening degree under the normal condition, the exhaust gas recirculation valve may be blocked due to the influence of icing, and the exhaust gas recirculation valve may have the icing phenomenon, so that the need of icing the exhaust gas recirculation valve is determined.

S2324: and if the fourth opening degree is smaller than or equal to the fourth preset opening degree, determining that the exhaust gas recirculation valve does not need to be iced.

After determining whether the fourth opening degree is larger than the fourth preset opening degree, if the fourth opening degree is smaller than or equal to the fourth preset opening degree, the opening degree of the exhaust gas recirculation valve can quickly reach the opening degree under the normal condition, meanwhile, the opening degree of the exhaust gas recirculation valve can also quickly reach the closing opening degree under the normal condition, the exhaust gas recirculation valve is not blocked due to the influence of icing, the exhaust gas recirculation valve is not frozen, and the fact that the exhaust gas recirculation valve is iced is determined to be unnecessary.

In this embodiment, after determining whether the third opening is smaller than the third preset opening, if the third opening is larger than or equal to the first preset opening, the valve body of the exhaust gas recirculation valve is controlled to rotate in the direction of decreasing the opening by a fourth preset duty ratio, the fourth opening of the exhaust gas recirculation valve when the valve body rotates to a fourth preset duration is recorded, whether the fourth opening is larger than the fourth preset opening is determined, if the fourth opening is larger than the fourth preset opening, it is determined that the exhaust gas recirculation valve needs to be iced, if the fourth opening is smaller than or equal to the fourth preset opening, it is determined that the exhaust gas recirculation valve does not need to be iced, a process of ice breaking determination is performed according to the fourth opening (closing opening) of the exhaust gas recirculation valve after determining whether the third opening is smaller than the third preset opening is determined, and further ice determination is performed according to the closing opening on the basis of ice determination, so that the accuracy of the ice determination result is ensured.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.

In one embodiment, an exhaust gas recirculation valve control apparatus is provided that corresponds one-to-one to the exhaust gas recirculation valve control method of the above embodiment. As shown in fig. 4, the egr valve control device includes a first determination module 401, a second determination module 402, and a control module 403. The functional modules are described in detail as follows:

a first determining module 401, configured to determine a temperature of a coolant of a motor cooling system on a vehicle after the vehicle is powered on;

a second determination module 402 for determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to a coolant temperature of the motor cooling system;

the control module 403 is configured to control the egr valve to complete the ice breaking operation if the egr valve needs to be iced.

Further, the control module 403 is specifically configured to:

Further, the control module 403 is specifically further configured to:

after a first preset interval, controlling the valve body of the exhaust gas recirculation valve to rotate in the direction of reducing the opening degree by using a second preset duty ratio, and recording the second opening degree of the exhaust gas recirculation valve when the valve body rotates to a second preset time length;

Further, the second determining module 402 is specifically configured to:

Further, the second determining module 402 is specifically further configured to:

Further, after determining whether the third opening is smaller than the third preset opening, the second determining module 402 is specifically further configured to:

The specific limitation regarding the egr valve control device may be found in the limitation of the egr valve control method hereinabove, and will not be described in detail herein. The various modules in the exhaust gas recirculation valve control apparatus described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, an exhaust gas recirculation valve control apparatus is provided. The exhaust gas recirculation valve control device comprises a processor and a memory which are connected through a system bus. Wherein the processor of the EGR valve control device is configured to provide computing and control capabilities. The memory of the exhaust gas recirculation valve control apparatus includes a storage medium and an internal memory. The storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the storage media. The computer program is executed by a processor to implement an exhaust gas recirculation valve control method.

In one embodiment, as shown in fig. 5, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above exhaust gas recirculation valve control method when executing the computer program.

In one embodiment, a readable storage medium is provided having a computer program stored thereon, which when executed by a processor, implements the steps of the above-described EGR valve control method.

Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored in a computer-readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. An exhaust gas recirculation valve control method, characterized by comprising:

determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to the temperature of the cooling liquid of the motor cooling system;

If the exhaust gas recirculation valve needs to be iced, controlling the exhaust gas recirculation valve to finish the iced operation;

the controlling the EGR valve to complete the icebreaking operation includes:

controlling the EGR valve to execute an ice breaking operation to determine whether the opening degree of the EGR valve meets a target requirement;

if the opening degree of the EGR valve meets the target requirement, determining that the ice breaking of the EGR valve is completed, and stopping executing the ice breaking operation;

the controlling the egr valve to perform an ice breaking operation to determine whether an opening degree of the egr valve satisfies a target demand includes:

after the preset interval after the rotation is passed, controlling the valve body of the exhaust gas recirculation valve to rotate towards the direction of decreasing the opening degree by a second preset duty ratio, and recording the second opening degree of the exhaust gas recirculation valve when the valve body rotates to a second preset duration;

If the first opening is greater than or equal to the first preset opening and the second opening is less than or equal to the second preset opening, determining that the opening of the exhaust gas recirculation valve meets the target requirement;

the determining whether the exhaust gas recirculation valve on the vehicle needs to be iced according to the cooling liquid temperature of the motor cooling system comprises the following steps:

if the exhaust gas recirculation valve needs to be subjected to icing check, controlling the exhaust gas recirculation valve to execute an icing check strategy so as to determine whether the exhaust gas recirculation valve needs to be subjected to ice breaking according to an icing check result;

the controlling the egr valve to perform an icing check strategy to determine whether the egr valve needs to be iced according to an icing check result includes:

determining whether the third opening is smaller than a third preset opening or not, wherein the third preset opening is larger than the first preset opening;

if the fourth opening is larger than the fourth preset opening, determining that the exhaust gas recirculation valve needs to be iced;

2. The exhaust gas recirculation valve control method according to claim 1, wherein the controlling the exhaust gas recirculation valve to complete an ice breaking operation further comprises:

and if the opening degree of the EGR valve does not meet the target requirement, repeating the ice breaking operation until the opening degree of the EGR valve meets the target requirement or until the number of times of executing the ice breaking operation is greater than a preset number of times.

3. The exhaust gas recirculation valve control method according to claim 1, characterized in that the controlling the exhaust gas recirculation valve to perform an ice breaking operation to determine whether an opening degree of the exhaust gas recirculation valve satisfies a target demand, further comprises:

and if the first opening is smaller than the first preset opening or the second opening is larger than the second preset opening, determining that the opening of the exhaust gas recirculation valve does not meet the target requirement.

4. The exhaust gas recirculation valve control method according to any one of claims 1 to 3, wherein the determining whether or not the exhaust gas recirculation valve on the vehicle needs to be iced according to the coolant temperature of the motor cooling system, further comprises:

and determining whether the exhaust gas recirculation valve needs to be subjected to icing check according to the cooling liquid temperature and the environment temperature.

5. The egr valve control method according to claim 1, wherein the controlling the egr valve performs an icing check strategy to determine whether the egr valve needs to be iced according to an icing check result, further comprising:

6. The egr valve control method according to claim 4, wherein the determining whether icing check of the egr valve is required based on the coolant temperature and the ambient temperature includes:

and if the temperature of the cooling liquid is greater than the first preset temperature or the ambient temperature is greater than the second preset temperature, determining that the freezing check of the exhaust gas recirculation valve is not needed.

7. An exhaust gas recirculation valve control apparatus, characterized by comprising:

a second determining module for determining whether an exhaust gas recirculation valve on the vehicle needs to be iced according to a coolant temperature of the motor cooling system;

the control module is used for controlling the EGR valve to finish the ice breaking operation if the EGR valve needs to break ice;

the exhaust gas recirculation valve control apparatus is configured to implement the exhaust gas recirculation valve control method according to claim 1.

8. An exhaust gas recirculation valve control arrangement comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the exhaust gas recirculation valve control method according to any one of claims 1 to 6.

9. A readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the exhaust gas recirculation valve control method according to any one of claims 1 to 6.