CN109159773B - Method for determining initial voltage value of brake pedal, triggering method and related device - Google Patents
Method for determining initial voltage value of brake pedal, triggering method and related device Download PDFInfo
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- CN109159773B CN109159773B CN201811222028.4A CN201811222028A CN109159773B CN 109159773 B CN109159773 B CN 109159773B CN 201811222028 A CN201811222028 A CN 201811222028A CN 109159773 B CN109159773 B CN 109159773B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/06—Disposition of pedal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Elements And Transmission Devices (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention provides a method for determining an initial voltage value of a brake pedal, a triggering method and a related device. The determination method comprises the following steps: judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time; and if the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and the voltage fluctuation value of the brake pedal is less than a preset second threshold value, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal. The initial voltage value of the brake pedal is determined based on the voltage value fed back in the learning process of the brake pedal, the influence of tolerance existing in the assembling process on the initial voltage value of the brake pedal is overcome, and the accuracy of the initial voltage value of the brake pedal is ensured.
Description
Technical Field
The invention relates to the technical field of new energy electric vehicle control, in particular to a method for determining an initial voltage value of a brake pedal, a triggering method and a related device.
Background
A brake pedal (pedal for short) is a potentiometer-type sensor, and the pedal is located at different positions corresponding to different voltages. Generally, the voltage range corresponding to the pedal is 0V to 5V, that is, in practical applications, the voltage value (also referred to as initial voltage value) corresponding to the pedal when the pedal is not stressed (i.e., in the initial state of the pedal) is 0V, and the voltage value corresponding to the pedal when the pedal is fully depressed by the driver is 5V.
Due to the tolerance of the brake pedal during the assembly process, when the pedal is assembled on the vehicle, the voltage value corresponding to the initial state of the pedal may be greater than 0V, for example, a value between 0V and 0.5V. Assuming that the initial voltage value of the pedal is actually 0.3V after the pedal is mounted on the vehicle, if 0V is still used as the initial voltage value of the brake pedal at this time, the vehicle controller may determine that the brake is effective at this time, and control the vehicle to brake, and if the driver is operating the accelerator pedal at this time, the vehicle may still not be driven to be in a braking state because the priority of the brake pedal is higher than that of the accelerator pedal, which undoubtedly brings a very bad operation experience to the driver.
In view of the above problems, the current solution is to select the voltage value with the largest tolerance, such as 0.5V mentioned above, as the initial voltage value of the brake pedal in the initial state, and the vehicle controller determines whether the brake pedal is pressed down by comparing whether the voltage value corresponding to the pedal is greater than 0.5V.
However, the applicant finds that the current solution still has some problems, and still assumes that the initial voltage value of the pedal is actually 0.3V after the pedal is mounted on the vehicle, and the current solution is to use 0.5V as the initial voltage value of the brake pedal, so that when the driver actually operates the vehicle, in the process that the voltage value corresponding to the brake pedal is increased from 0.3V to 0.5V when the driver lightly steps on the brake pedal, the vehicle controller judges that the voltage value corresponding to the brake pedal is less than 0.5V and determines that the brake pedal is not stepped on, and therefore the vehicle is not controlled to brake, and then the driver presses the brake pedal but the vehicle does not brake, and the driver considers that the brake is insensitive.
Therefore, how to accurately determine the initial voltage value of the brake pedal is a technical problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a method for determining an initial voltage value of a brake pedal, a triggering method and a related device, which are used for accurately determining the initial voltage value of the brake pedal. The technical scheme is as follows:
based on one aspect of the invention, the invention provides a method for determining an initial voltage value of a brake pedal, which comprises the following steps:
judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time;
and if the maximum voltage value of the brake pedal is greater than a preset first threshold value within the preset first time and the voltage fluctuation value of the brake pedal is less than a preset second threshold value, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal.
Optionally, before determining whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and determining whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time, the determining method further includes:
initializing a vehicle control unit;
after the initialization of the vehicle control unit is completed, the steps of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time are executed.
Optionally, when it is determined that the maximum voltage value of the brake pedal is not greater than a preset first threshold within a preset first time, or when it is determined that the voltage fluctuation value of the brake pedal is not less than a preset second threshold within the preset first time, or when a determination result is not obtained within the preset first time, the determination result includes a first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold, a second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold, and a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal, where the determining method further includes:
judging whether the determination method is artificially triggered or not;
if yes, outputting a determination failure result;
if not, returning to the step of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
Optionally, when it is determined that the determining method is not artificially triggered, the determining method further includes:
and after waiting for a preset second time, returning to execute the steps of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
Optionally, the determining whether the determining is artificially triggered includes:
judging whether the received trigger information for triggering the execution of the determination method comes from an external device;
if yes, judging that the determining method is artificially triggered;
if not, judging that the determining method is triggered autonomously.
Based on another aspect of the present invention, the present invention provides a triggering method, where the triggering method is used to trigger execution of a brake pedal initial voltage value determination method, where the brake pedal initial voltage value determination method is the brake pedal initial voltage value determination method described above; the triggering method comprises the following steps:
judging whether a request sent by external equipment for triggering execution of the brake pedal initial voltage value determination method is received currently;
if the request is received, triggering to execute the brake pedal initial voltage value determination method;
if the request is not received, judging whether the brake pedal initial voltage value determination method is successfully executed;
determining that execution of the brake pedal initial voltage value determination method is no longer triggered if the brake pedal initial voltage value determination method has been successfully executed;
if the brake pedal initial voltage value determination method is not successfully executed, judging whether the brake pedal initial voltage value determination method is triggered to be executed or not;
determining that the brake pedal initial voltage value determination method is not triggered to be executed any more if the brake pedal initial voltage value determination method is triggered to be executed;
and triggering to execute the initial brake pedal voltage value determination method if the initial brake pedal voltage value determination method is not triggered to be executed.
Optionally, the determining whether a request sent by an external device for triggering execution of the method for determining the initial voltage value of the brake pedal is currently received includes:
and when the system is detected to be powered on, judging whether a request sent by external equipment for triggering the execution of the brake pedal initial voltage value determining method is received currently.
Based on still another aspect of the present invention, there is provided a brake pedal initial voltage value determination apparatus, comprising:
the first judgment unit is used for judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time;
the second judging unit is used for judging whether the voltage fluctuation value of the brake pedal is smaller than a preset second threshold value within the preset first time;
and the initial voltage value determining unit is used for determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal when the first judging unit judges that the maximum voltage value of the brake pedal is greater than a preset first threshold value within the preset first time, and the second judging unit judges that the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
Optionally, the determining means further comprises:
a third determining unit, configured to determine whether the determining method is triggered manually, when the first determining unit determines that the maximum voltage value of the brake pedal is not greater than a preset first threshold within a preset first time, or when the second determining unit determines that the voltage fluctuation value of the brake pedal is not less than a preset second threshold within the preset first time, or when a determining result is not obtained within the preset first time, where the determining result includes a first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold, a second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold, or a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal;
a result output unit, configured to output a determination failure result when the third determination unit determines that the determination method is artificially triggered;
the first judging unit is further configured to, when the third judging unit judges that the determining method is not artificially triggered, perform the step of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time again, and the second judging unit is further configured to, when the third judging unit judges that the determining method is not artificially triggered, perform the step of judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time again.
Based on the other aspect of the invention, the invention provides a triggering device, which is used for triggering and executing the method for determining the initial voltage value of the brake pedal, wherein the method for determining the initial voltage value of the brake pedal is the method for determining the initial voltage value of the brake pedal described above; the triggering device comprises:
the fourth judgment unit is used for judging whether a request sent by external equipment for triggering the execution of the brake pedal initial voltage value determination method is received currently;
the triggering unit is used for triggering and executing the method for determining the initial voltage value of the brake pedal when the fourth judging unit judges that the request is received;
a fifth judging unit, configured to judge whether the brake pedal initial voltage value determining method has been successfully executed when the fourth judging unit judges that the request has not been received;
a first determining unit, configured to determine that execution of the brake pedal initial voltage value determining method is no longer triggered when the fifth judging unit judges that the brake pedal initial voltage value determining method has been successfully executed;
a sixth judging unit, configured to judge whether the brake pedal initial voltage value determining method is triggered to be executed when the fifth judging unit judges that the brake pedal initial voltage value determining method is not successfully executed;
the second determining unit is used for determining that the brake pedal initial voltage value determining method is not triggered to be executed any more when the sixth judging unit judges that the brake pedal initial voltage value determining method is triggered to be executed;
the triggering unit is further configured to trigger execution of the method for determining the initial voltage value of the brake pedal when the sixth judging unit judges that execution of the method for determining the initial voltage value of the brake pedal is not triggered.
In the method for determining the initial voltage value of the brake pedal, the triggering method and the related device, when the maximum voltage value of the brake pedal is judged to be greater than a preset first threshold value within a preset first time and the voltage fluctuation value of the brake pedal is judged to be less than a preset second threshold value, the maximum voltage value of the brake pedal is determined as the initial voltage value of the brake pedal. The initial voltage value of the brake pedal is determined based on the voltage value fed back in the learning process of the brake pedal, the influence of tolerance existing in the assembling process on the initial voltage value of the brake pedal is overcome, and the accuracy of the initial voltage value of the brake pedal is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining an initial voltage value of a brake pedal according to the present invention;
FIG. 2 is a flow chart illustrating another method for determining an initial brake pedal voltage level according to the present invention;
FIG. 3 is a flow chart of a triggering method provided by the present invention;
FIG. 4 is a schematic structural diagram of a brake pedal initial voltage value determining apparatus according to the present invention;
fig. 5 is a schematic structural diagram of a triggering device provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The method for determining the initial voltage value of the brake pedal is applied to a Vehicle Control Unit (VCU), substantially belongs to a self-learning method of the vehicle control unit, and aims to enable the vehicle control unit to determine the initial voltage value of the brake pedal through learning.
In the invention, the vehicle control unit judges whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and judges whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time. When the vehicle control unit judges that the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and the voltage fluctuation value of the brake pedal is less than a preset second threshold value, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal. Because the initial voltage value of the brake pedal is determined based on the voltage value fed back in the self-learning process of the brake pedal, the influence of the tolerance existing in the assembling process on the initial voltage value of the brake pedal is overcome, and the accuracy of the initial voltage value of the brake pedal is ensured.
In the present invention, the execution sequence of the step of determining the maximum voltage value of the brake pedal and the preset first threshold and the step of determining the voltage fluctuation value of the brake pedal and the preset second threshold is not limited. In the practical application process of the invention, whether the maximum voltage value of the brake pedal is greater than a preset first threshold value or not can be judged, and when the maximum voltage value of the brake pedal is greater than the preset first threshold value, the step of judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value or not is executed. Or, it may be determined whether the voltage fluctuation value of the brake pedal is smaller than a preset second threshold, and when it is determined that the voltage fluctuation value of the brake pedal is smaller than the preset second threshold, the step of determining whether the maximum voltage value of the brake pedal is greater than the preset first threshold is performed, and of course, the two determination steps may be performed simultaneously.
For convenience of description, the following embodiments of the present invention will be described by taking an example of determining whether the maximum voltage value of the brake pedal is greater than a preset first threshold, and then performing a step of determining whether the voltage fluctuation value of the brake pedal is less than a preset second threshold when the maximum voltage value of the brake pedal is greater than the preset first threshold.
Example one
As shown in fig. 1, the method for determining the initial voltage value of the brake pedal according to the present invention may include:
In the invention, the preset duration of the first time can be flexibly defined according to the learning method precision and the user-defined requirements of the whole vehicle factory, such as 2s, 2.5s, 3s, 3.5s and the like. The preset first threshold may be defined according to a pedal assembly initial voltage tolerance range provided by a supplier of the brake pedal or according to a customized requirement of a whole vehicle factory, such as 0.36V, 0.4V, 0.42V, and the like.
In the application process of the invention, the vehicle control unit can monitor and acquire the voltage values corresponding to different positions of the brake pedal at different moments in real time, and further compare the maximum voltage value acquired in the first time with a preset first threshold value.
And 102, judging whether the voltage fluctuation value of the brake pedal is smaller than a preset second threshold value within a preset first time. If so, go to step 103, and if not, go to step 104.
The voltage fluctuation value of the brake pedal is the difference value of the maximum voltage value of the brake pedal and the minimum voltage value of the brake pedal. In the present invention, the preset second threshold may be defined according to an initial pedal voltage fluctuation range provided by a supplier of the brake pedal or according to a customized requirement of a whole vehicle factory, such as 0.018V, 0.02V, 0.023V, and so on.
In the application process of the invention, when the vehicle control unit judges that the maximum voltage value of the brake pedal is greater than the preset first threshold value, the vehicle control unit further judges whether the voltage fluctuation value of the brake pedal is less than the preset second threshold value within the first time.
And 103, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal.
If the voltage fluctuation value of the brake pedal is smaller than a preset second threshold value within the first time, the initial voltage value of the brake pedal is determined successfully, and the maximum voltage value of the brake pedal within the first time is determined as the initial voltage value of the brake pedal.
And step 104, ending.
In the invention, if the maximum voltage value of the brake pedal is not greater than a preset first threshold value or the voltage fluctuation value of the brake pedal is not less than a preset second threshold value within the first time, the initial voltage value of the brake pedal is determined to fail to be determined, and the process is ended.
According to the method for determining the initial voltage value of the brake pedal, the maximum voltage value of the brake pedal is determined as the initial voltage value of the brake pedal when the maximum voltage value of the brake pedal is judged to be larger than a preset first threshold value within a preset first time and the voltage fluctuation value of the brake pedal is judged to be smaller than a preset second threshold value. The initial voltage value of the brake pedal is determined based on the voltage value fed back in the learning process of the brake pedal, the influence of tolerance existing in the assembling process on the initial voltage value of the brake pedal is overcome, and the accuracy of the initial voltage value of the brake pedal is ensured.
Example two
As shown in fig. 2, the present invention provides another method for determining an initial voltage value of a brake pedal, which may include:
In order to further improve the accuracy of the determined initial voltage value of the brake pedal, when the system is detected to be powered on, the vehicle controller is initialized, and after the vehicle controller is initialized, step 202 is executed.
In the present invention, it is assumed that the execution time required for step 201 is 1s, that is, step 202 is executed after waiting for 1 s. And in the 1s time, the whole vehicle controller completes initialization.
In the present invention, it is assumed that the preset first time is 3 s.
In the embodiment of the present invention, when it is determined that the maximum voltage value of the brake pedal within the 3s is greater than the preset first threshold, step 203 is executed, and if the maximum voltage value of the brake pedal within the 3s is not greater than the preset first threshold, it indicates that the initial voltage value of the brake pedal is too low, and then step 205 is executed continuously.
Optionally, when it is determined in step 202 that the maximum voltage value of the brake pedal is not greater than the preset first threshold within the preset first time, the present invention may further output a failure message, and the failure message may include a failure reason, such as that the initial voltage value of the brake pedal is too low.
In the embodiment of the present invention, when it is determined that the voltage fluctuation value of the brake pedal within the 3s is smaller than the preset second threshold, step 204 is executed, and if the voltage fluctuation value of the brake pedal within the 3s is not smaller than the preset first threshold, it indicates that the voltage fluctuation of the brake pedal is too large, at this time, step 205 is continuously executed.
Optionally, when it is determined in step 203 that the voltage fluctuation value of the brake pedal is smaller than the preset second threshold value within the preset first time, the present invention may further output a failure message, and the failure message may include a failure cause, such as an excessive fluctuation of the brake pedal voltage.
And step 204, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal.
Further, according to the present invention, after the initial voltage value of the brake pedal is determined, the determined initial voltage value of the brake pedal may be stored in a nonvolatile storage area of the vehicle controller, so that the initial voltage value of the brake pedal is not lost even after the vehicle controller is powered off. When the next method for determining the initial voltage value of the brake pedal is triggered and a new initial voltage value is determined, the new initial voltage value can be updated to the initial voltage value of the brake pedal stored in the nonvolatile storage area, so that the initial voltage value of the brake pedal stored in the nonvolatile storage area is always the latest value.
Further preferably, the present invention may set a flag indicating whether the determination of the initial voltage value of the brake pedal is successful in the vehicle control unit in advance, and the flag is predefined to indicate that the determination of the initial voltage value of the brake pedal is successful when the flag is equal to 1 and to indicate that the determination of the initial voltage value of the brake pedal is failed when the flag is equal to 0. Therefore, in the present invention, when it may be determined that the determination of the initial voltage value of the brake pedal is successful after the initial voltage value of the brake pedal is determined, the flag in the vehicle control unit is set to 1, whereas in the present invention, if it is determined that the initial voltage value of the brake pedal is failed, the flag in the vehicle control unit is set to 0.
The application process of the invention comprises two triggering modes, one is an artificial triggering mode, namely, a person sends triggering information to a vehicle controller through an external device, such as a diagnostic instrument, to control and trigger the determination method, and the other is an autonomous triggering mode, wherein the autonomous triggering mode is that a vehicle controller actively triggers and executes the determination method when a vehicle-mounted system is in a stable state. Therefore, in a specific implementation of the present invention, it may be determined whether the trigger mode currently triggering execution of the determination method is artificial trigger or autonomous trigger by determining whether the received trigger information for triggering execution of the determination method is from a diagnostic apparatus.
If the received trigger information for triggering execution of the determination method is from an external device, it may be determined that a trigger manner for triggering execution of the determination method is artificial trigger, that is, the determination method is artificially triggered; if the received trigger information for triggering execution of the determination method is not from the external device, it may be determined that the trigger manner for triggering execution of the determination method is autonomous, that is, the vehicle control unit autonomously triggers the determination method.
And step 206, outputting a determination failure result.
Taking the external device as an example, specifically, a diagnostic apparatus is assumed, in which an identifier for indicating whether the determination method is successfully executed is preset and is predefined, when the identifier is equal to 1, the determination method is successfully executed, and when the identifier is equal to 0, the determination method is failed to be executed. In the invention, when the vehicle control unit judges that the determination method is triggered and executed by a person through controlling the diagnostic apparatus at present, the vehicle control unit may send a failure message to the diagnostic apparatus, so that a value of an identifier used for indicating whether the determination method is successfully executed in the diagnostic apparatus is set to 0. When the maintenance personnel see that the identification in the diagnostic instrument is equal to 0, the current brake pedal can be determined to have problems in time, and therefore the brake pedal is detected and maintained.
In the above embodiment of the present invention, as a further preferable mode of the present invention, when the present invention determines in step 205 that the determining method is not triggered by human, the present invention may wait for a preset second time before returning to step 202.
The preset second time may be defined by referring to a time required for initializing the vehicle control unit, that is, an execution time required in step 201. For example, if the preset second time is equal to or greater than the execution time 1s required in step 201, the present invention waits for 1s and then returns to step 202 when it is determined in step 205 that the determination method is not triggered by human. During the waiting time of 1s, the method for determining the initial voltage value of the brake pedal provided by the invention can be recovered to the initial state, the vehicle-mounted system is recovered to the stable state, and at this time, the step 202 is executed again. The initial state refers to a state before step 202 is executed, and the stable state to which the vehicle-mounted system is restored includes, for example: after the external force for treading the brake pedal disappears, the brake pedal is restored to the original position, and the original position of the brake pedal is the position of the brake pedal before the method for determining the initial voltage value of the brake pedal is triggered and executed.
In the practical application process of the invention, various abnormal conditions such as system downtime, processing delay and the like may occur, and after the abnormal conditions occur, the determination process of the initial voltage value of the brake pedal may be influenced by the abnormal conditions, so that the determination of the initial voltage value of the brake pedal cannot be normally completed. In view of this, the present invention further provides that the determining method may further include: and detecting whether a judgment result is obtained within the preset first time, wherein the judgment result comprises a first result of whether the maximum voltage value of the brake pedal is greater than a preset first threshold value, a second result of whether the voltage fluctuation value of the brake pedal is smaller than a preset second threshold value, and a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal.
More specifically, the first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold value includes: the result that the maximum voltage value of the brake pedal is greater than a preset first threshold value and the result that the maximum voltage value of the brake pedal is not greater than the preset first threshold value; the second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold value includes: the voltage fluctuation value of the brake pedal is smaller than a preset second threshold value, and the voltage fluctuation value of the brake pedal is not smaller than the preset second threshold value.
In the present invention, if the determination result is not obtained within the first time, it may be directly determined that the determination of the initial voltage value of the brake pedal fails, and then step 205 is performed.
The invention provides a method for determining an initial voltage value of a brake pedal in a pure electric vehicle, which is applied to a vehicle control unit and belongs to a self-learning method of the vehicle control unit. By the method, the initial voltage value of the brake pedal in the pure electric vehicle can be accurately determined.
The invention also provides a triggering method set for the method for determining the initial voltage value of the brake pedal, which is specifically used for triggering and executing the method for determining the initial voltage value of the brake pedal, and the method for determining the initial voltage value of the brake pedal is the method for determining the initial voltage value of the brake pedal shown in fig. 1, fig. 2 and described above. As shown in fig. 3, the triggering method provided by the present invention may include:
Alternatively, the present invention may execute step 301 after detecting that the system is powered on.
Wherein step 301 is specifically configured to determine whether the method for determining the initial voltage value of the brake pedal is triggered by human.
And if the method is triggered manually, directly triggering to execute the method for determining the initial voltage value of the brake pedal.
If not, further judgment is needed to determine whether the brake pedal initial voltage value determination method has been successfully executed. Specifically, the determination may be determined according to a flag in the vehicle control unit, which indicates whether the determination of the initial brake pedal voltage value is successful. Wherein when the flag is equal to 1, it may be determined that the brake pedal initial voltage value determination method has been successfully performed; when the flag is equal to 0, it may be determined that the brake pedal initial voltage value determination method has not been successfully performed.
In step 304, it is determined that execution of the brake pedal initial voltage value determination method is no longer triggered.
If it is determined that the brake pedal initial voltage value determination method has been successfully performed, it is determined that execution of the brake pedal initial voltage value determination method is not currently being triggered.
And 305, judging whether the brake pedal initial voltage value determination method is triggered to be executed or not. If the brake pedal initial voltage value determination method has been triggered to be executed, step 304 is executed, otherwise, step 302 is executed.
If it is determined that the brake pedal initial voltage value determination method has not been successfully executed, it is necessary to further determine whether the brake pedal initial voltage value determination method has been triggered to be executed. If the initial brake pedal voltage value determination method is not triggered to be executed, the vehicle controller actively triggers to execute the initial brake pedal voltage value determination method; if the brake pedal initial voltage value determination method has been triggered to execute, it is determined that execution of the brake pedal initial voltage value determination method is no longer triggered.
In the triggering method provided by the invention, when a request sent by an external device for triggering and executing the method for determining the initial voltage value of the brake pedal is not received, the method for determining the initial voltage value of the brake pedal is determined to be actively triggered and executed by a vehicle controller once by sequentially judging that the method for determining the initial voltage value of the brake pedal is not successfully executed and when the method for determining the initial voltage value of the brake pedal is not triggered and executed, so that the method for determining the initial voltage value of the brake pedal is ensured to be actively triggered and executed once by the vehicle controller before the vehicle is triggered and executed from a production line to a diagnosis device, and the vehicle can be ensured to normally run from the production line.
Therefore, the invention can be used for determining the pedal position after the vehicle is electrified for the first time in production line, and ensures that the vehicle can normally run to an EOL (diagnosis device) before the initial voltage value of the brake pedal is determined. In the invention, the determination process of the initial voltage value of the brake pedal can be triggered by a diagnosis service (namely a vehicle control unit) or manually by means of external equipment.
Based on the method for determining the initial voltage value of the brake pedal provided by the invention in the previous text, the invention further provides a device for determining the initial voltage value of the brake pedal, as shown in fig. 4, the device may include:
the first judging unit 10 is configured to judge whether a maximum voltage value of the brake pedal is greater than a preset first threshold within a preset first time;
a second determining unit 20, configured to determine whether a voltage fluctuation value of the brake pedal is smaller than a preset second threshold within the preset first time;
the initial voltage value determining unit 30 is configured to determine the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal when the first determining unit 10 determines that the maximum voltage value of the brake pedal is greater than a preset first threshold value within the preset first time, and the second determining unit 20 determines that the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
Optionally, the determining means may further include:
a third determining unit, configured to determine whether the determining method is triggered manually when the first determining unit 10 determines that the maximum voltage value of the brake pedal is not greater than a preset first threshold within a preset first time, or when the second determining unit 20 determines that the voltage fluctuation value of the brake pedal is not less than a preset second threshold within the preset first time, or when a determination result is not obtained within the preset first time, where the determination result includes a first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold, a second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold, or a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal;
a result output unit, configured to output a determination failure result when the third determination unit determines that the determination method is artificially triggered;
the first determining unit 10 is further configured to, when the third determining unit determines that the determining method is not artificially triggered, perform the step of determining whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time again, and the second determining unit 20 is further configured to, when the third determining unit determines that the determining method is not artificially triggered, perform the step of determining whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time again.
Based on the triggering method provided by the invention in the previous text, the invention further provides a triggering device, wherein the triggering device is used for triggering and executing the method for determining the initial voltage value of the brake pedal, and the method for determining the initial voltage value of the brake pedal is the method for determining the initial voltage value of the brake pedal. As shown in fig. 5, the triggering device may include:
a fourth judging unit 100, configured to judge whether a request sent by an external device for triggering execution of the brake pedal initial voltage value determination method is currently received;
a triggering unit 200, configured to trigger execution of the method for determining the initial voltage value of the brake pedal when the fourth determining unit 100 determines that the request is received;
a fifth judging unit 300, configured to judge whether the brake pedal initial voltage value determination method has been successfully executed when the fourth judging unit 100 judges that the request has not been received;
a first determining unit 400, configured to determine that execution of the brake pedal initial voltage value determining method is not triggered any more when the fifth judging unit 300 judges that the brake pedal initial voltage value determining method has been successfully executed;
a sixth judging unit 500, configured to judge whether the brake pedal initial voltage value determination method is triggered to be executed when the fifth judging unit 300 judges that the brake pedal initial voltage value determination method is not successfully executed;
a second determining unit 600, configured to determine that the execution of the brake pedal initial voltage value determining method is no longer triggered when the sixth determining unit 500 determines that the execution of the brake pedal initial voltage value determining method is triggered;
the triggering unit 200 is further configured to trigger the execution of the method for determining the initial voltage value of the brake pedal when the sixth determining unit 500 determines that the method for determining the initial voltage value of the brake pedal has not been triggered to be executed.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method for determining the initial voltage value of the brake pedal, the triggering method and the related devices provided by the invention are described in detail, specific examples are applied in the text to explain the principle and the implementation mode of the application, and the description of the above embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of determining an initial brake pedal voltage value, the method comprising:
judging whether the maximum voltage value of a brake pedal in a preset first time is greater than a preset first threshold value or not, and judging whether the voltage fluctuation value of the brake pedal in the preset first time is less than a preset second threshold value or not, wherein the voltage fluctuation value of the brake pedal is the difference value between the maximum voltage value and the minimum voltage value of the brake pedal in the preset first time;
and if the maximum voltage value of the brake pedal is greater than a preset first threshold value within the preset first time and the voltage fluctuation value of the brake pedal is less than a preset second threshold value, determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal.
2. The determination method according to claim 1, wherein before determining whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and determining whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time, the determination method further comprises:
initializing a vehicle control unit; after the initialization of the vehicle control unit is completed, the steps of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time are executed.
3. The determination method according to claim 1, wherein when it is determined that the maximum voltage value of the brake pedal is not greater than a preset first threshold value within a preset first time, or when it is determined that the voltage fluctuation value of the brake pedal is not less than a preset second threshold value within the preset first time, or when no determination result is obtained within the preset first time, the determination result includes a first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold value, a second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold value, and a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal, the determination method further comprising:
judging whether the determination method is artificially triggered or not;
if yes, outputting a determination failure result;
if not, returning to the step of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
4. The method of claim 3, wherein when it is determined that the method of determination is not artificially triggered, the method of determination further comprises:
and after waiting for a preset second time, returning to execute the steps of judging whether the maximum voltage value of the brake pedal is greater than a preset first threshold value within a preset first time, and judging whether the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
5. The method of claim 3, wherein said determining whether the determination is artificially triggered comprises:
judging whether the received trigger information for triggering the execution of the determination method comes from an external device;
if yes, judging that the determining method is artificially triggered;
if not, judging that the determining method is triggered autonomously.
6. A triggering method, wherein the triggering method is used for triggering execution of a brake pedal initial voltage value determination method, wherein the brake pedal initial voltage value determination method is the brake pedal initial voltage value determination method according to any one of claims 1 to 5; the triggering method comprises the following steps:
judging whether a request sent by external equipment for triggering execution of the brake pedal initial voltage value determination method is received currently;
if the request is received, triggering to execute the brake pedal initial voltage value determination method;
if the request is not received, judging whether the brake pedal initial voltage value determination method is successfully executed;
determining that execution of the brake pedal initial voltage value determination method is no longer triggered if the brake pedal initial voltage value determination method has been successfully executed;
if the brake pedal initial voltage value determination method is not successfully executed, judging whether the brake pedal initial voltage value determination method is triggered to be executed or not;
determining that the brake pedal initial voltage value determination method is not triggered to be executed any more if the brake pedal initial voltage value determination method is triggered to be executed;
and triggering to execute the initial brake pedal voltage value determination method if the initial brake pedal voltage value determination method is not triggered to be executed.
7. The triggering method according to claim 6, wherein the judging whether a request sent by an external device for triggering the execution of the brake pedal initial voltage value determining method is currently received comprises:
and when the system is detected to be powered on, judging whether a request sent by external equipment for triggering the execution of the brake pedal initial voltage value determining method is received currently.
8. A brake pedal initial voltage value determination apparatus, characterized in that the determination apparatus comprises:
the first judgment unit is used for judging whether the maximum voltage value of the brake pedal in a preset first time is greater than a preset first threshold value or not;
a second determination unit, configured to determine whether a voltage fluctuation value of the brake pedal is smaller than a preset second threshold within the preset first time, where the voltage fluctuation value of the brake pedal is a difference between a maximum voltage value and a minimum voltage value of the brake pedal within the preset first time;
and the initial voltage value determining unit is used for determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal when the first judging unit judges that the maximum voltage value of the brake pedal is greater than a preset first threshold value within the preset first time, and the second judging unit judges that the voltage fluctuation value of the brake pedal is less than a preset second threshold value within the preset first time.
9. The apparatus according to claim 8, wherein the apparatus further comprises:
a third determining unit, configured to determine whether the determining device is triggered manually, when the first determining unit determines that the maximum voltage value of the brake pedal is not greater than a preset first threshold within a preset first time, or when the second determining unit determines that the voltage fluctuation value of the brake pedal is not less than a preset second threshold within the preset first time, or when a determination result is not obtained within the preset first time, where the determination result includes a first result of whether the maximum voltage value of the brake pedal is greater than the preset first threshold, a second result of whether the voltage fluctuation value of the brake pedal is less than the preset second threshold, or a third result of determining the maximum voltage value of the brake pedal as the initial voltage value of the brake pedal;
a result output unit configured to output a determination failure result when the third determination unit determines that the determination device is artificially triggered;
the first judging unit is further configured to, when the third judging unit judges that the determining device is not manually triggered, perform the step of judging whether the maximum voltage value of the brake pedal is greater than the preset first threshold value within the preset first time again, and the second judging unit is further configured to, when the third judging unit judges that the determining device is not manually triggered, perform the step of judging whether the voltage fluctuation value of the brake pedal is less than the preset second threshold value within the preset first time again.
10. A triggering device, wherein the triggering device is used for triggering execution of a brake pedal initial voltage value determination method, and the brake pedal initial voltage value determination method is the brake pedal initial voltage value determination method according to any one of claims 1 to 5; the triggering device comprises:
the fourth judgment unit is used for judging whether a request sent by external equipment for triggering the execution of the brake pedal initial voltage value determination method is received currently;
the triggering unit is used for triggering and executing the method for determining the initial voltage value of the brake pedal when the fourth judging unit judges that the request is received;
a fifth judging unit, configured to judge whether the brake pedal initial voltage value determining method has been successfully executed when the fourth judging unit judges that the request has not been received;
a first determining unit, configured to determine that execution of the brake pedal initial voltage value determining method is no longer triggered when the fifth judging unit judges that the brake pedal initial voltage value determining method has been successfully executed;
a sixth judging unit, configured to judge whether the brake pedal initial voltage value determining method is triggered to be executed when the fifth judging unit judges that the brake pedal initial voltage value determining method is not successfully executed;
the second determining unit is used for determining that the brake pedal initial voltage value determining method is not triggered to be executed any more when the sixth judging unit judges that the brake pedal initial voltage value determining method is triggered to be executed;
the triggering unit is further configured to trigger execution of the method for determining the initial voltage value of the brake pedal when the sixth judging unit judges that execution of the method for determining the initial voltage value of the brake pedal is not triggered.
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| CN201811222028.4A CN109159773B (en) | 2018-10-19 | 2018-10-19 | Method for determining initial voltage value of brake pedal, triggering method and related device |
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| CN201811222028.4A CN109159773B (en) | 2018-10-19 | 2018-10-19 | Method for determining initial voltage value of brake pedal, triggering method and related device |
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| CN109159773B true CN109159773B (en) | 2021-02-19 |
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| DE10063654B4 (en) * | 2000-12-20 | 2008-07-17 | Nucellsys Gmbh | Method and arrangement for generating accelerator position-dependent current values for the power control of one or more drives in a mobile device with a fuel cell for the power supply |
| CN105015443B (en) * | 2014-04-16 | 2017-07-04 | 北京现代汽车有限公司 | A kind of control method of new-energy automobile accelerator pedal fault diagnosis |
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