CN112665842B - Method and device for detecting spring performance of EGR valve - Google Patents
Method and device for detecting spring performance of EGR valve Download PDFInfo
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- CN112665842B CN112665842B CN202011504805.1A CN202011504805A CN112665842B CN 112665842 B CN112665842 B CN 112665842B CN 202011504805 A CN202011504805 A CN 202011504805A CN 112665842 B CN112665842 B CN 112665842B
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Abstract
The application discloses a spring performance detection method and device of an EGR valve. The method comprises the following steps: after an engine of a vehicle is stopped, under the condition that the condition of executing spring performance detection is determined to be met, controlling an EGR motor to adjust the opening degree of an EGR valve to a first opening degree, keeping the state for a calibration time length, then obtaining a driving duty ratio of an ERG motor and a duty ratio limit value corresponding to the first opening degree, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, determining that the spring performance of the EGR valve is abnormal. Based on the scheme disclosed in this application, can carry out accurate detection to the performance of the spring in the EGR valve.
Description
Technical Field
The application belongs to the technical field of equipment performance detection, and particularly relates to a spring performance detection method and device of an EGR valve.
Background
EGR (Exhaust Gas Recirculation) systems are widely used in vehicles and function as: a portion of the exhaust gases from the engine are directed into the intake manifold and mixed with fresh air before entering the combustion chamber of the engine to reduce the nitrogen oxides in the resulting exhaust.
The EGR valve is an important component in an EGR system, and the amount of exhaust gas that reenters the engine can be controlled by adjusting the opening degree of the EGR valve. The EGR valve is provided with a spring, and when the EGR valve does not work, the EGR valve is in a normally closed state under the action of the spring. The spring is a vulnerable part, and the performance of the spring is gradually reduced along with the increase of the using time. When the performance of the spring is abnormal, if the spring is not replaced in time, the ERG valve can be caused to be in fault, and the normal operation of the EGR system is influenced.
Therefore, how to accurately detect the spring performance of the EGR valve is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for detecting spring performance of an EGR valve, so as to accurately detect the performance of a spring in the EGR valve.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a spring performance detection method of an EGR valve, which comprises the following steps:
judging whether a condition for executing spring performance detection is met or not after an engine of a vehicle is stopped;
if the condition is met, controlling an EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the calibration time length;
obtaining a driving duty ratio of the EGR motor;
obtaining a duty cycle limit value corresponding to the first opening degree;
and if the driving duty ratio of the ERG motor is smaller than the duty ratio limit value corresponding to the first opening degree, determining that the performance of the spring is abnormal.
Optionally, in the method for detecting spring performance, before controlling the EGR motor to adjust the opening degree of the EGR valve to the first opening degree and keeping the opening degree for a calibration time period, the method further includes:
performing a preset number of self-cleaning operations on the EGR valve.
Optionally, in the method for detecting spring performance, the determining whether the condition for executing the spring performance detection is satisfied includes:
obtaining the current environment temperature and the temperature of the ERG motor;
and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
Optionally, in the spring performance detection method, obtaining a duty limit corresponding to the first opening degree includes:
obtaining a current EGR valve temperature;
and determining the duty ratio limit value corresponding to the current temperature of the EGR valve and the first opening according to the pre-constructed opening degree of the EGR valve and the mapping relation between the temperature of the EGR valve and the duty ratio limit value.
Optionally, on the basis of the spring performance detection method, the method further includes:
a mapping relation between the opening degree of the EGR valve, the temperature of the EGR valve and the duty ratio limit value is constructed in advance.
The application still provides a spring performance detection device of EGR valve, includes:
the judging unit is used for judging whether the conditions for executing the spring performance detection are met or not after the engine of the vehicle is stopped;
the control unit is used for controlling the EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the opening degree for a calibration time length under the condition that the condition is met;
a drive duty obtaining unit for obtaining a drive duty of the EGR motor;
a duty limit value obtaining unit configured to obtain a duty limit value corresponding to the first opening degree;
an opening degree adjusting unit for determining that the performance of the spring is abnormal when a driving duty of the ERG motor is less than a duty limit corresponding to the first opening degree.
Optionally, on the basis of the spring performance detecting device, the device further includes:
and the self-cleaning unit is used for executing self-cleaning operation on the EGR valve for a preset number of times under the condition that the condition is met, and then triggering the opening degree adjusting unit to execute operation of controlling the EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the opening degree of the EGR valve for a calibrated duration.
Optionally, in the spring performance detecting device, the determining unit is specifically configured to:
obtaining the current environment temperature and the temperature of the ERG motor; and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
Optionally, in the spring performance detection apparatus, the duty limit obtaining unit is specifically configured to:
obtaining a current EGR valve temperature; and determining the duty ratio limit value corresponding to the current temperature of the EGR valve and the first opening according to the pre-constructed opening degree of the EGR valve and the mapping relation between the temperature of the EGR valve and the duty ratio limit value.
Optionally, on the basis of the spring performance detecting device, the device further includes:
and the preprocessing unit is used for constructing a mapping relation between the opening of the EGR valve, the temperature of the EGR valve and the duty ratio limit value in advance.
Therefore, the beneficial effects of the application are as follows:
according to the method and the device for detecting the spring performance of the EGR valve, after an engine of a vehicle is stopped, under the condition that the condition for executing the spring performance detection is determined to be met, the EGR motor is controlled to adjust the opening degree of the EGR valve to a first opening degree, the state is kept for a calibration time length, then the driving duty ratio of the ERG motor and the duty ratio limit value corresponding to the first opening degree are obtained, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, the spring performance of the EGR valve is determined to be abnormal. It can be seen that, according to the scheme disclosed in the application, based on the influence of the decrease of the spring performance on the drive duty ratio of the EGR motor, when the engine of the vehicle is stopped and the condition for executing the spring performance detection is determined to be satisfied, the EGR motor is controlled to adjust the opening degree of the EGR valve to the first opening degree and keep the calibration duration, and whether the spring of the EGR valve is abnormal or not can be determined by comparing the drive duty ratio of the EGR motor at the time with the duty ratio limit value corresponding to the first opening degree, and the detection result has high accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of detecting spring performance of an EGR valve as disclosed herein;
FIG. 2 is a flow chart of another EGR valve spring performance detection method disclosed herein;
FIG. 3 is a flow chart of another EGR valve spring performance detection method disclosed herein;
FIG. 4 is a schematic structural diagram of a spring performance detection apparatus of an EGR valve according to the present disclosure;
fig. 5 is a schematic structural view of another EGR valve spring performance detection apparatus disclosed in the present application.
Detailed Description
The application discloses a spring performance detection method and device of an EGR valve, so that the performance of a spring in the EGR valve can be accurately detected.
In order to make the objects, 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 with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for detecting a spring performance of an EGR valve according to the present disclosure. The method comprises the following steps:
s101: after an engine of a vehicle is stopped, it is determined whether a condition for executing spring performance detection is satisfied. If the condition is satisfied, step S102 is performed.
S102: and controlling the EGR motor to adjust the opening degree of the EGR valve to the first opening degree and keeping the calibration time length.
Optionally, the first opening degree is between 30% and 70%, inclusive.
In practice, the calibration time length may be 500 ms, which is only an example and does not limit the calibration time length.
S103: the drive duty of the EGR motor is obtained.
S104: a duty cycle limit corresponding to the first opening degree is obtained.
S105: and if the driving duty ratio of the ERG motor is less than the duty ratio limit value corresponding to the first opening degree, determining that the performance of the spring is abnormal.
The EGR motor can control the opening of the EGR valve to vary between 0% and 100%. An Electronic Control Unit (ECU) controls the driving current of the EGR motor by outputting different driving duty ratios, thereby controlling the driving torque of the EGR so as to adjust the opening degree of the EGR.
Specifically, the method comprises the following steps: during engine operation, the engine exhausts exhaust gas and the EGR motor needs to overcome friction, spring force, and exhaust gas flow resistance to maintain the EGR valve at the desired opening. When the engine is stopped and no exhaust gas is discharged, the EGR motor needs to overcome friction and spring force to adjust the opening of the EGR valve.
The driving duty ratio of the EGR motor is in direct proportion to the driving torque, the spring force which needs to be overcome by the EGR motor is in direct proportion to the stiffness coefficient of the spring, when the performance of the spring is reduced, the stiffness coefficient of the spring is reduced, the spring force which needs to be overcome by the ERG motor is reduced, and correspondingly, the driving torque which needs to be provided by the EGR motor is also reduced correspondingly.
That is to say: under the condition that the spring performance is normal, the EGR motor adjusts the opening degree of the EGR valve to a first opening degree and maintains the state, the spring force required to be overcome is the first spring force, and the driving torque required to be provided is the first torque; after the performance of the spring is reduced, the ERG motor adjusts the opening degree of the EGR valve to a first opening degree and maintains the state, the spring force required to be overcome is a second spring force (smaller than the first spring force), and the driving torque required to be provided is a second torque (smaller than the first torque).
Therefore, after controlling the EGR motor to adjust the opening degree of the EGR valve to the first opening degree and keeping the opening degree for the calibrated duration, the performance of the spring can be determined based on the driving duty ratio of the EGR motor and the duty ratio limit value corresponding to the first opening degree. And if the drive duty ratio of the ERG motor is smaller than the duty ratio limit value corresponding to the first opening degree, determining that the performance of the spring is abnormal, and if the drive duty ratio of the ERG motor is larger than or equal to the duty ratio limit value corresponding to the first opening degree, determining that the performance of the spring is normal.
According to the method for detecting the spring performance of the EGR valve, after an engine of a vehicle is stopped, under the condition that the condition of executing the spring performance detection is determined to be met, the EGR motor is controlled to adjust the opening degree of the EGR valve to a first opening degree, the state is kept for a calibration time length, then the driving duty ratio of the ERG motor and the duty ratio limit value corresponding to the first opening degree are obtained, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, the spring performance of the EGR valve is determined to be abnormal. It can be seen that, according to the scheme disclosed in the application, based on the influence of the decrease of the spring performance on the drive duty ratio of the EGR motor, when the engine of the vehicle is stopped and the condition for executing the spring performance detection is determined to be satisfied, the EGR motor is controlled to adjust the opening degree of the EGR valve to the first opening degree and keep the calibration duration, and whether the spring of the EGR valve is abnormal or not can be determined by comparing the drive duty ratio of the EGR motor at the time with the duty ratio limit value corresponding to the first opening degree, and the detection result has high accuracy.
Referring to fig. 2, fig. 2 is a flow chart illustrating another method for detecting spring performance of an EGR valve disclosed herein. The method comprises the following steps:
s201: after an engine of a vehicle is stopped, it is determined whether a condition for performing spring performance detection is satisfied. If the condition is satisfied, step S202 is performed.
S202: the self-cleaning operation is performed for the EGR valve a preset number of times.
During vehicle operation, deposits, such as carbon deposits and dust, may adhere to the EGR valve.
The purpose of the self-cleaning operation of the EGR valve is to reduce or eliminate deposits on the EGR valve, thereby reducing or eliminating the effect of the deposits on the spring performance test results.
In operation, the EGR valve is controlled to perform a full opening and a full closing action to generate vibration to shake off deposits on the EGR valve.
S203: and controlling the EGR motor to adjust the opening degree of the EGR valve to the first opening degree and keeping the calibration time length.
Optionally, the first opening degree is between 30% and 70%, inclusive.
In practice, the calibration time length may be 500 ms, which is only an example and does not limit the calibration time length.
S204: the drive duty of the EGR motor is obtained.
S205: a duty cycle limit corresponding to the first opening degree is obtained.
S206: and if the driving duty ratio of the ERG motor is less than the duty ratio limit value corresponding to the first opening degree, determining that the performance of the spring is abnormal.
In the method for detecting the spring performance of the EGR valve shown in fig. 2, after an engine of a vehicle is stopped, under the condition that the condition for executing the spring performance detection is determined to be met, self-cleaning operation is performed on the EGR valve for a preset number of times to reduce or eliminate deposits on the EGR valve, then the EGR motor is controlled to adjust the opening degree of the EGR valve to a first opening degree, the state is kept for a calibration time, then the driving duty ratio of the ERG motor and the duty ratio limit value corresponding to the first opening degree are obtained, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, the spring performance of the EGR valve is determined to be abnormal. Compared with the method shown in FIG. 1, the self-cleaning operation of the EGR valve for the preset times is added, so that the deposit on the EGR valve can be reduced or eliminated, the influence of the deposit on the spring performance detection result is reduced or eliminated, and the accuracy of the detection result is further improved.
In one embodiment, whether the condition for executing the spring performance detection is met is judged, and the following scheme is adopted:
obtaining the current temperature of the ERG motor;
and if the current temperature of the EGR motor is in a preset motor temperature range, determining that the condition for executing the spring performance detection is met.
In one embodiment, whether the condition for executing the spring performance detection is met is judged, and the following scheme is adopted:
obtaining the current environment temperature and the temperature of the ERG motor;
and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
In one embodiment, a mapping of the opening degree of the EGR valve to the duty limit is constructed in advance.
Correspondingly, a duty ratio limit value corresponding to the first opening degree is obtained, and the following scheme is adopted: and determining the duty ratio limit value corresponding to the first opening degree according to a mapping relation between the opening degree of the EGR valve and the duty ratio limit value which is constructed in advance.
In practice, duty cycle limits corresponding to a plurality of opening degrees of the EGR valve are determined through a plurality of tests, and a mapping relation between the opening degree of the EGR valve and the duty cycle limits is established.
In one embodiment, a mapping of the opening of the EGR valve, the temperature of the EGR valve, and the duty cycle limit is pre-constructed.
Correspondingly, a duty ratio limit value corresponding to the first opening degree is obtained, and the following scheme is adopted: obtaining a current EGR valve temperature; and determining the duty ratio limit value corresponding to the current temperature and the first opening degree of the EGR valve according to the pre-constructed opening degree of the EGR valve and the mapping relation between the temperature and the duty ratio limit value of the EGR valve.
The temperature of the EGR valve has some effect on the spring rate, which causes: when the temperatures of the EGR valves are different for the same EGR valve, the spring force generated by the spring is different even if the EGR valves are at the same opening degree.
Therefore, in the above-described embodiment, the map of the opening degree of the EGR valve, the temperature of the EGR valve, and the duty limit value is constructed in advance. That is, the opening and temperature of each set of EGR valves corresponds to a duty cycle limit. For the same opening value, the higher the temperature of the EGR valve, the smaller the corresponding duty limit value, and the lower the temperature of the ERG valve, the lower the corresponding duty limit value.
In practice, duty cycle limits corresponding to a plurality of opening degrees of the EGR valve at a plurality of temperatures are determined through a plurality of tests, and a mapping relation between the opening degree of the EGR valve, the temperature of the EGR valve and the duty cycle limits is established.
Referring to fig. 3, fig. 3 is a flowchart illustrating another EGR valve spring performance detection method disclosed in the present application. The method comprises the following steps:
s301: the engine is stopped.
S302: the current ambient temperature and the temperature of the ERG motor are obtained.
S303: and judging whether the current environment temperature is in a preset environment temperature interval or not, and the current temperature of the EGR motor is in a preset motor temperature interval. If yes, step S304 is executed, and if no, step S302 is continued.
S304: the EGR valve is subjected to 2 self-cleaning operations.
S305: the EGR motor is controlled to adjust the opening of the EGR valve to 50% and held in this state for a prescribed time, such as 500 milliseconds.
S306: the drive duty of the EGR motor is obtained.
S307: and judging whether the driving duty ratio of the ERG motor is smaller than a duty ratio limit value corresponding to the opening value of 50%. If yes, step S308 is performed, and if no, step S309 is performed.
S308: it is determined that performance of a spring of the EGR valve is abnormal.
S309: it is determined that the spring of the EGR valve is functioning properly.
The method for detecting the spring performance of the EGR valve disclosed above may be executed by an ECU of the vehicle, or may be executed by another controller in the vehicle.
The application discloses the spring performance detection method of the EGR valve, correspondingly, the application discloses the spring performance detection device of the EGR valve, and the description about the spring performance detection device and the spring performance detection device in the specification can be mutually referred to.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a spring performance detection apparatus of an EGR valve according to the present disclosure. The apparatus includes a determination unit 100, an opening degree adjustment unit 200, a driving duty ratio acquisition unit 300, a duty ratio limit acquisition unit 400, and a processing unit 500.
Wherein:
the determination unit 100 is configured to determine whether a condition for performing the spring performance detection is satisfied after an engine of the vehicle is stopped.
And the opening adjusting unit 200 is used for controlling the EGR motor to adjust the opening of the EGR valve to the first opening and keeping the first opening for a calibration time period under the condition that the conditions are met.
And a driving duty obtaining unit 300 for obtaining a driving duty of the EGR motor.
A duty limit acquisition unit 400 for acquiring a duty limit corresponding to the first opening degree.
And a processing unit 500 for determining that performance of a spring of the EGR valve is abnormal in a case where a driving duty of the ERG motor is less than a duty limit value corresponding to the first opening degree.
The application discloses a spring performance detection device of an EGR valve, after an engine of a vehicle is shut down, under the condition that the condition of executing spring performance detection is determined to be met, an EGR motor is controlled to adjust the opening degree of the EGR valve to a first opening degree, the state is kept for a calibration time length, then the driving duty ratio of an ERG motor and the duty ratio limit value corresponding to the first opening degree are obtained, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, the spring performance of the EGR valve is determined to be abnormal. It can be seen that, according to the solution disclosed in the present application, based on the influence of the decrease in the spring performance on the driving duty of the EGR motor, when the engine of the vehicle is stopped and it is determined that the condition for performing the spring performance detection is satisfied, the EGR motor is controlled to adjust the opening of the EGR valve to the first opening and keep the calibration duration, and by comparing the driving duty of the EGR motor at this time with the duty limit corresponding to the first opening, it can be determined whether the spring of the EGR valve is abnormal, and the detection result has high accuracy.
Referring to fig. 5, fig. 5 is a schematic structural view of another EGR valve spring performance detection apparatus disclosed in the present application. The spring performance detecting apparatus shown in fig. 5 is further provided with a self-cleaning unit 600, as compared to the spring performance detecting apparatus shown in fig. 4.
The self-cleaning unit 600 is used to: under the condition that the condition of executing the spring performance detection is met, self-cleaning operation is executed on the EGR valve for a preset number of times, and then the opening degree adjusting unit 200 is triggered to execute operation of controlling the EGR motor to adjust the opening degree of the EGR valve to the first opening degree and keeping the first opening degree for a calibrated duration.
In the spring performance detection device of the EGR valve shown in fig. 5 of the present application, after an engine of a vehicle is stopped, in a case where it is determined that a condition for performing spring performance detection is satisfied, a preset number of self-cleaning operations are performed on the EGR valve to reduce or eliminate deposits on the EGR valve, then the EGR motor is controlled to adjust the opening degree of the EGR valve to a first opening degree, and the state is maintained for a calibration time, then a driving duty ratio of the ERG motor and a duty ratio limit value corresponding to the first opening degree are obtained, and if the driving duty ratio of the EGR motor is smaller than the duty ratio limit value corresponding to the first opening degree, it is determined that the spring performance of the EGR valve is abnormal. Compared with the device shown in FIG. 4, the self-cleaning operation of the EGR valve is performed for a preset number of times, so that the deposit on the EGR valve can be reduced or eliminated, the influence of the deposit on the spring performance detection result is reduced or eliminated, and the accuracy of the detection result is further improved.
In an embodiment, the determining unit 100 is specifically configured to: obtaining the current temperature of the ERG motor; and if the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
In one embodiment, the determining unit 100 is configured to: obtaining the current environment temperature and the temperature of the ERG motor; and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
In an embodiment, the duty cycle limit obtaining unit 400 is specifically configured to: the duty limit corresponding to the first opening degree is determined from a pre-constructed mapping relationship between the opening degree of the EGR valve and the duty limit.
Optionally, on the basis of the spring performance detection device shown in fig. 4 and 5, a preprocessing unit is further provided. The preprocessing unit is used for: a mapping relation between the opening degree of the EGR valve and the duty ratio limit value is constructed in advance.
In an embodiment, the duty cycle limit obtaining unit 400 is specifically configured to: obtaining a current EGR valve temperature; and determining the duty ratio limit value corresponding to the current temperature of the EGR valve and the first opening according to the pre-constructed opening degree of the EGR valve and the mapping relation between the temperature of the EGR valve and the duty ratio limit value.
Optionally, on the basis of the spring performance detection device shown in fig. 4 and 5, a preprocessing unit is further provided. The preprocessing unit is used for: a mapping relation between the opening degree of the EGR valve, the temperature of the EGR valve and the duty ratio limit value is constructed in advance.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The spring performance detection device disclosed in the embodiment corresponds to the spring performance detection method disclosed in the embodiment, so that the description is relatively simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A spring performance detection method of an EGR valve is characterized by comprising the following steps:
judging whether a condition for executing spring performance detection is met or not after an engine of a vehicle is stopped;
if the condition is met, controlling an EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the calibration time length;
obtaining a driving duty ratio of the EGR motor;
obtaining a duty cycle limit value corresponding to the first opening degree;
determining that the performance of the spring is abnormal if the driving duty of the EGR motor is less than a duty limit corresponding to the first opening degree;
the obtaining of the duty limit corresponding to the first opening degree includes:
obtaining a current EGR valve temperature;
determining a duty ratio limit value corresponding to the current temperature of the EGR valve and the first opening degree according to a pre-constructed mapping relation between the opening degree of the EGR valve and the temperature of the EGR valve and the duty ratio limit value;
wherein the temperature of the EGR valve is inversely proportional to the duty cycle limit when the opening of the EGR valve is the same.
2. The spring performance detection method of claim 1, wherein before controlling the EGR motor to adjust the opening of the EGR valve to the first opening and for a calibrated duration, further comprising:
performing a preset number of self-cleaning operations on the EGR valve.
3. The spring performance detection method according to claim 1 or 2, wherein the determining whether a condition for performing spring performance detection is satisfied includes:
obtaining the current environment temperature and the temperature of an EGR motor;
and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
4. The spring performance detection method of claim 1, further comprising:
a mapping relation between the opening degree of the EGR valve, the temperature of the EGR valve and the duty ratio limit value is constructed in advance.
5. A spring performance detection device of an EGR valve, characterized by comprising:
a judging unit for judging whether a condition for executing spring performance detection is satisfied after an engine of a vehicle is stopped;
the opening degree adjusting unit is used for controlling the EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the first opening degree for a calibration time length under the condition that the condition is met;
a drive duty obtaining unit for obtaining a drive duty of the EGR motor;
a duty limit value obtaining unit configured to obtain a duty limit value corresponding to the first opening degree;
a processing unit configured to determine that performance of the spring is abnormal, when a driving duty of the EGR motor is smaller than a duty limit value corresponding to the first opening degree;
the duty cycle limit acquisition unit is specifically configured to:
obtaining a current EGR valve temperature; determining a duty ratio limit value corresponding to the current temperature of the EGR valve and the first opening degree according to a pre-constructed mapping relation between the opening degree of the EGR valve and the temperature of the EGR valve and the duty ratio limit value;
wherein the temperature of the EGR valve is inversely proportional to the duty cycle limit when the opening of the EGR valve is the same.
6. The spring performance detecting apparatus according to claim 5, further comprising:
and the self-cleaning unit is used for executing self-cleaning operation on the EGR valve for preset times under the condition that the condition is met, and then triggering the opening degree adjusting unit to execute operation of controlling the EGR motor to adjust the opening degree of the EGR valve to a first opening degree and keeping the first opening degree for a calibrated duration.
7. The spring performance detection device according to claim 5 or 6, wherein the determination unit is specifically configured to:
obtaining the current environment temperature and the temperature of an EGR motor; and if the current environment temperature is in a preset environment temperature interval and the current temperature of the EGR motor is in a preset motor temperature interval, determining that the condition for executing the spring performance detection is met.
8. The spring performance detecting apparatus according to claim 5, further comprising:
and the preprocessing unit is used for constructing a mapping relation between the opening degree of the EGR valve, the temperature of the EGR valve and the duty ratio limit value in advance.
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| CN202011504805.1A CN112665842B (en) | 2020-12-18 | 2020-12-18 | Method and device for detecting spring performance of EGR valve |
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| CN202011504805.1A CN112665842B (en) | 2020-12-18 | 2020-12-18 | Method and device for detecting spring performance of EGR valve |
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| CN112665842B true CN112665842B (en) | 2023-03-21 |
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