CN105620459A - Electric vehicle brake pedal diagnosing method and device - Google Patents
Electric vehicle brake pedal diagnosing method and device Download PDFInfo
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- CN105620459A CN105620459A CN201410714472.3A CN201410714472A CN105620459A CN 105620459 A CN105620459 A CN 105620459A CN 201410714472 A CN201410714472 A CN 201410714472A CN 105620459 A CN105620459 A CN 105620459A
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Abstract
The invention discloses an electric vehicle brake pedal diagnosing method and device. The diagnosing method comprises the steps that the on-off state of a first brake pedal and the on-off state of a second brake pedal are obtained; whether the on-off state of the first brake pedal and the on-off state of the second brake pedal are the same or not is judged; when the on-off state of the first brake pedal is different from the on-off state of the second brake pedal, the corresponding on-off state of the first brake pedal and the on-off state of the second brake pedal in a continuous N-time brake pedal operation process are obtained, and one time of brake pedal operation is once operation for treading the brake pedals and then loosening the brake pedals; and when the corresponding on-off state of the first brake pedal and the on-off state of the second brake pedal are not exactly the same in the N-time brake pedal operation process, the judgment that the brake pedals break down is made. By the adoption of the method and device, misinformation of brake pedal failure can be effectively reduced, so that traffic potential safety hazards are reduced.
Description
Technical field
The present invention relates to electric automobile field, particularly relate to a kind of electric vehicle brake pedal diagnostic method and device.
Background technology
Along with the pay attention to day by day to energy security and environmental protection problem, new-energy automobile, for instance electric automobile is increasingly becoming the development trend of automobile now. Electric automobile, with on-vehicle battery for power, uses motor-driven vehicle to travel. At present, the kind of electric automobile includes pure electric automobile, hybrid vehicle and fuel cell car.
In electric automobile; brake pedal signal is one of important input signal of electric automobile whole moment of torsion control; in the brake pedal apparatus of automobile; the functions such as the idle stop of electric automobile, braking energy feedback are required for according to brake pedal signal as input Rule of judgment, it is therefore desirable to whether brake pedal signal is normally carried out diagnosis.
In prior art, it is usually the brake switch hard signal received according to entire car controller and judges whether brake pedal breaks down. Such as, whether the state according to judging two-way brake switch hard signal unanimously judges whether brake pedal breaks down, but does not account for brake-pedal travel signal is verified. Thus, there is the possibility of wrong report in existing brake pedal method for diagnosing faults so that traffic safety exists bigger potential safety hazard.
Summary of the invention
The problem that the embodiment of the present invention solves is how to reduce brake pedal fault misdescription, reduces traffic safety hidden danger.
For solving the problems referred to above, the embodiment of the present invention provides a kind of electric vehicle brake pedal diagnostic method, including:
Obtain the first brake pedal switch state and the second brake pedal switch state; Judge that whether described first brake pedal switch state and described second brake pedal switch state be identical; When described first brake pedal switch state is different from described second brake pedal switch state, obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, a brake pedal operation is the operation loosened the brake after a brake pedal; When in N continuous time brake pedal operation process, when corresponding described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
Optionally, the described brake pedal of described judgement also includes after breaking down: controls the travel speed of described electric automobile less than pre-set velocity, and lights trouble light.
Optionally, described judge that whether described first brake pedal switch state and described second brake pedal switch state be identical, including: when described brake pedal tips into or out, described first brake pedal switch state be triggering state and described second brake pedal switch state for not triggering state time, or when described first brake pedal switch state is not for trigger state, described second brake pedal switch state is triggering state and when brake pedal position signal magnitude of voltage is not in pre-set interval, judge that described first brake pedal switch state is different from described second brake pedal switch state.
Optionally, before the first brake pedal switch state of acquisition and the second brake pedal switch state, also include: obtain the percent travel of brake pedal position, the percent travel of described acquisition brake pedal position includes: detect when described brake pedal position changes, and obtains current brake pedal position signal voltage value; Obtain brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference within the scope of brake pedal effective travel; According to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position.
Optionally, described according to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position, including: adopt ��=(U-U0)/�� U calculates the percent travel of current brake pedal position, and wherein, �� is the percent travel of current brake pedal position, and U is current brake pedal position signal voltage value, U0For initial position signal magnitude of voltage, �� U is the output voltage difference within the scope of brake pedal effective travel.
For solving above-mentioned at least one of which problem, embodiments provide a kind of electric vehicle brake pedal diagnostic equipment, including:
First acquiring unit, is used for the first brake pedal switch state that obtains and the second brake pedal switch state;
Judging unit, is used for judging that whether described first brake pedal switch state and described second brake pedal switch state be identical;
Second acquisition unit, for when described first brake pedal switch state is different from described second brake pedal switch state, obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, a brake pedal operation is the operation loosened the brake after a brake pedal;
Identifying unit, for when in N continuous time brake pedal operation process, when corresponding described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
Optionally, the described electric vehicle brake pedal diagnostic equipment also includes: control unit, for, after described identifying unit judges that described brake pedal breaks down, controlling the travel speed of described electric automobile less than pre-set velocity, and light trouble light.
Optionally, obtain the first brake pedal switch state and the second brake pedal switch state at described first acquiring unit before, also include: stroke acquiring unit, for when detecting that described brake pedal position changes, obtaining current brake pedal position signal voltage value; Obtain brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference within the scope of brake pedal effective travel; According to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantage that
After the first brake pedal switch state that detects is different from the second brake pedal switch state, it is not directly judge that brake pedal breaks down, but obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, only in N continuous time brake pedal operation process, when the first corresponding brake pedal switch state and the second brake pedal switch state are all incomplete same, just judge that brake pedal breaks down. Therefore can efficiently reduce the probability of brake pedal fault misdescription, improve traffic safety.
Further, after judging that brake pedal breaks down, the travel speed controlling electric automobile less than pre-set velocity and lights trouble light, it is possible to further improve the safety of driving.
Additionally, by the output voltage difference within the scope of brake pedal effective travel, calculate the percent travel of current brake pedal position. It is definite value owing to the output voltage difference within the scope of brake pedal effective travel corresponds to the electric automobile of same vehicle, therefore the percent travel obtained when driver steps on identical stroke is equal, without all going for each car to perform the operation that pedal travel percentage ratio obtains. Further, according to the first brake pedal switch state, the second brake pedal switch state and brake pedal position, the state of brake pedal is judged, it is possible to further reduce the probability of brake pedal fault misdescription simultaneously.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of electric vehicle brake pedal diagnostic method in the embodiment of the present invention;
Fig. 2 is the flow chart of a kind of electric vehicle brake pedal travel acquisition methods in the embodiment of the present invention;
Fig. 3 is the structural representation of a kind of electric vehicle brake pedal diagnostic equipment in the embodiment of the present invention.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the embodiment of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
In prior art, it is usually the brake switch hard signal received according to entire car controller and judges whether brake pedal breaks down. Such as, whether the state according to judging two-way brake switch hard signal unanimously judges whether brake pedal breaks down, but does not account for brake-pedal travel signal is verified. Thus, there is the possibility of wrong report in existing brake pedal method for diagnosing faults so that traffic safety exists bigger potential safety hazard.
For this problem, embodiments provide a kind of electric vehicle brake pedal diagnostic method, with reference to Fig. 1, be described in detail below by way of concrete steps.
Step S101, obtains the first brake pedal switch state and the second brake pedal switch state.
In being embodied as, it is possible to detect whether current brake pedal position changes by brake pedal position signal sensor. When detecting that brake pedal position changes, it is possible to obtain the state of the first brake pedal switch and the state of the second brake pedal switch respectively, and perform step S102.
In embodiments of the present invention, the situation that brake pedal position changes can include following two: 1) driver's brake pedal; 2) driver loosens the brake after brake pedal. Therefore, when detecting that brake pedal position changes, it is possible to obtain the first corresponding brake pedal switch state and the second brake pedal switch state. Such as, after driver's brake pedal being detected, obtain the first brake pedal switch state and the second brake pedal switch state of correspondence respectively, and perform step S102.
Step S102, it is judged that whether described first brake pedal switch state is identical with described second brake pedal switch state.
In being embodied as, after getting the first brake pedal switch state and the second brake pedal switch state, it is possible to first the two is compared, it is judged that whether the two is identical.
When the first brake pedal switch state is different from the second brake pedal switch state, perform step S103; When the first brake pedal switch state is identical with the second brake pedal switch state, then judge that current brake pedal does not break down.
In actual applications, in brake pedal or the process loosened the brake, if brake pedal is in normal condition, then the first brake pedal switch state should all should be identical with the second brake pedal switch state. Such as, being under normal circumstances at brake pedal, when brake pedal, the first brake pedal switch state is triggering state, and the second brake pedal switch also should be in triggering state. Therefore, when the first brake pedal switch state is identical with the second brake pedal switch state, then can be determined that current brake pedal does not break down.
In an embodiment of the present invention, when brake pedal is in and steps on state, if the first brake pedal switch is in triggering state and the second brake pedal switch is in when not triggering state, judging that the first brake pedal switch state is different from the second brake pedal switch state, brake pedal would be likely to occur fault. Or when the first brake pedal switch be in the state of triggering, the second brake pedal switch is in triggering state and brake pedal position signal voltage is not in the voltage range preset time, judging that the first brake pedal switch state is different from the second brake pedal switch state, brake pedal would be likely to occur fault.
This is because: in actual applications, the trigger voltage of the first brake pedal switch is more than the trigger voltage of the second brake pedal switch. It is to say, the second brake pedal switch is triggered prior to the first brake pedal switch. Therefore when the first brake pedal switch is in triggering state, second brake pedal switch should be triggered under normal circumstances, in other words, it is in triggering state and the second brake pedal switch is in when not triggering state at the first brake pedal switch, then judges that brake pedal would be likely to occur fault.
Being in triggering state and the first brake pedal is in when not triggering state at the second brake pedal switch, under normal circumstances, brake pedal position signal voltage should be less than a certain setting voltage value, for instance, less than the maximum of brake pedal position signal voltage. If now detecting, brake pedal position signal voltage is more than setting voltage value, then judge that brake pedal would be likely to occur fault.
Similar, when brake pedal is in releasing orientation, if the first brake pedal switch is in triggering state and the second brake pedal still in when not triggering state, it is determined that the first brake pedal switch state is different from the second brake pedal switch state. Or when the first brake pedal switch be in the state of triggering, the second brake pedal switch is in triggering state and brake pedal position signal voltage is not in the voltage range preset time, judging that the first brake pedal switch state is different from the second brake pedal switch state, brake pedal would be likely to occur fault.
This is because: in actual applications, when loosening the brake, under normal circumstances the first brake pedal switch prior to the second brake pedal switch from triggering State Transferring to non-toggle state. Therefore, when the second brake pedal switch is in non-toggle state, if the first brake pedal switch is still in the state of triggering, then judge that brake pedal would be likely to occur fault. Be in, at the first brake pedal switch, the state of triggering, the second brake pedal switch is when being in triggering state, and brake pedal position signal voltage ought to more than a certain voltage setting value, for instance, brake pedal position signal minimum amount of voltage that. If now brake pedal position signal voltage is less than this setting value, then judge that brake pedal would be likely to occur fault.
In embodiments of the present invention, it is possible to there is the multiple situation causing the first brake pedal switch state different from the second brake pedal switch state. Such as, the situation such as the first brake pedal switch sensor experiences failure, the second brake pedal switch sensor experiences failure or noise jamming, it is therefore desirable to perform step S103 and judge further.
Step S103, when described first brake pedal switch state is different from described second brake pedal switch state, obtains in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state.
In being embodied as, when detecting that the first brake pedal switch state is different from the second brake pedal switch state, electronic control unit (ECU) can obtain in N continuous time brake pedal operation process, each time the first brake pedal switch state corresponding to brake pedal operation and the second brake pedal switch state.
In embodiments of the present invention, a brake pedal operation can be: the operation loosened the brake after stepping on a brake pedal. Therefore, the first brake pedal switch state and the second brake pedal switch state in the process of brake pedal operation each time that ECU gets be: the first brake pedal switch state corresponding during brake pedal and the second brake pedal switch state, and the first brake pedal switch state corresponding when loosening the brake and the second brake pedal switch state.
In embodiments of the present invention, it is possible to according to practical situation, select to continuously acquire the times N of brake pedal operation process. Such as, in an embodiment of the present invention, N=10. And for example, in an alternative embodiment of the invention, N=8.
Step S104, when in N continuous time brake pedal operation process, when described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
In being embodied as, from step S103, in N continuous time brake pedal operation process, corresponding to brake pedal operation each time, all can obtain the first brake pedal switch state and the second brake pedal switch state during brake pedal, and the first brake pedal switch state and the second brake pedal switch state when loosening the brake. When being respectively compared at brake pedal and loosen the brake, whether corresponding two-way brake pedal switch state is all identical.
If in N continuous time brake pedal operation process, corresponding to brake pedal operation each time, in brake pedal process or loosen the brake in process, the first corresponding brake pedal switch state and the second brake pedal switch state are also incomplete same, then can be determined that current brake pedal breaks down.
Visible, after the first brake pedal switch state that detects is different from the second brake pedal switch state, it is not directly judge that brake pedal breaks down, but obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, only in N continuous time brake pedal operation process, when the first corresponding brake pedal switch state and the second brake pedal switch state are all incomplete same, just judge that brake pedal breaks down. Therefore can efficiently reduce the probability of brake pedal fault misdescription, improve traffic safety.
In embodiments of the present invention, after step S104 judging, current brake pedal breaks down, consideration for traffic safety, the safety value that the travel speed of vehicle is default less than one can be controlled, and light trouble lamp to remind human pilot current brake pedal position signal to break down, current continuation driving would be likely to occur potential safety hazard, it is necessary to the reason that eliminating in time is currently broken down. It is understood that the state of Current vehicle is controlled by the control method that can also there are other.
In embodiments of the present invention, it is possible to according to actual demand, one safe speed is set, for instance, it is possible to arranging safe speed is 40km/h, it is also possible to arranging safe speed is 30km/h, it is also possible to safe speed is set to other values, repeats no more herein.
In actual applications, most of brake pedal system are to increase stroke sensor transformation on the basis of traditional mechanical braking pedal, stroke sensor is not verified, cause the brake pedal position stroke of acquisition and unreliable, it is therefore desirable to brake pedal switch and brake pedal position stroke are mutually verified.
Therefore, in the embodiment of the present invention, before brake pedal is diagnosed, it is possible to first brake pedal position stroke is verified, to obtain accurate brake-pedal travel. With reference to Fig. 2, embodiments provide a kind of electric vehicle brake pedal travel acquisition methods, be described in detail below by way of concrete steps.
Step S201, detects when described brake pedal position changes, and obtains current brake pedal position signal voltage value.
In embodiments of the present invention, the degree whether brake pedal position changes and change can be detected by brake pedal position sensor, when brake pedal position changes, brake pedal position sensor can obtain corresponding brake pedal position signal magnitude of voltage.
Step S202, obtains brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference in brake pedal effective travel.
In embodiments of the present invention, brake pedal initial position may refer to brake pedal and is in location when not stressing state. Brake pedal position sensor can be passed through and obtain the brake pedal position signal magnitude of voltage that brake pedal is corresponding when initial position.
In embodiments of the present invention, it is possible in advance for the different vehicle of same vehicle, the output voltage difference in brake pedal effective travel is obtained.
Step S203, according to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculates the percent travel of current brake pedal position.
In embodiments of the present invention, it is possible to adopt ��=(U-U0)/�� U calculates the percent travel of current brake pedal position, and wherein, �� is the percent travel of current brake pedal position, and U is current brake pedal position signal voltage value, U0For initial position signal magnitude of voltage, �� U is the output voltage difference within the scope of brake pedal effective travel.
And in actual applications, the stroke percentage ratio calculating current brake pedal position is to be undertaken by equation below:
��=(U-U0)/(U1-U0),
Wherein, U1It is in the signal voltage value that final position is corresponding for brake pedal.
But, in actual applications, corresponding to each car of same vehicle, the U of its correspondence1All be likely to and unequal, therefore, calculate current brake pedal position stroke percentage ratio time, corresponding to different vehicles, even if brake-pedal travel is equal, it is thus achieved that brake pedal position stroke percentage ratio be likely to difference. And in embodiments of the present invention, owing to the output voltage difference DELTA U within the scope of brake pedal effective travel is a fixed value, therefore for different vehicles, when brake-pedal travel is equal, corresponding brake-pedal travel percentage ratio is also identical, so that the energy regenerating moment of torsion of identical platform different vehicle and electricity are creeped, (E-Creep) moment of torsion has concordance.
As can be seen here, by the output voltage difference within the scope of brake pedal effective travel, the percent travel of current brake pedal position is calculated. It is definite value owing to the output voltage difference within the scope of brake pedal effective travel corresponds to the electric automobile of same vehicle, therefore the percent travel obtained when driver steps on identical stroke is equal, without all going for each car to perform the operation that pedal travel percentage ratio obtains.
After step S203 has performed, it is possible to further according to the brake pedal position stroke got, brake pedal is diagnosed, namely after step S203 has performed, perform step S101��step S104, such that it is able to reduce the probability of fault misdescription further.
With reference to Fig. 3, embodiments provide a kind of electric vehicle brake pedal diagnostic equipment 30, including: the first acquiring unit 301, judging unit 302, second acquisition unit 303 and identifying unit 304, wherein:
First acquiring unit 301, is used for the first brake pedal switch state that obtains and the second brake pedal switch state;
Judging unit 302, is used for judging that whether described first brake pedal switch state and described second brake pedal switch state be identical;
Second acquisition unit 303, for when described first brake pedal switch state is different from described second brake pedal switch state, obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, a brake pedal operation is the operation loosened the brake after a brake pedal;
Identifying unit 304, for when in N continuous time brake pedal operation process, when corresponding described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
In being embodied as, the described electric vehicle brake pedal diagnostic equipment 30 can also include: control unit 305, for, after described identifying unit 304 judges that described brake pedal breaks down, controlling the travel speed of described electric automobile less than pre-set velocity, and light trouble light.
In being embodied as, the described electric vehicle brake pedal diagnostic equipment 30 can also include: stroke acquiring unit 306, for obtain the first brake pedal switch state and the second brake pedal switch state at described first acquiring unit 301 before, when detecting that described brake pedal position changes, obtain current brake pedal position signal voltage value; Obtain brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference within the scope of brake pedal effective travel; According to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment can be by the hardware that program carrys out instruction relevant and completes, this program can be stored in a computer-readable recording medium, and storage medium may include that ROM, RAM, disk or CD etc.
Although present disclosure is as above, but the present invention is not limited to this. Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (8)
1. an electric vehicle brake pedal diagnostic method, it is characterised in that including:
Obtain the first brake pedal switch state and the second brake pedal switch state;
Judge that whether described first brake pedal switch state and described second brake pedal switch state be identical;
When described first brake pedal switch state is different from described second brake pedal switch state, obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, a brake pedal operation is the operation loosened the brake after a brake pedal;
When in N continuous time brake pedal operation process, when corresponding described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
2. electric vehicle brake pedal diagnostic method as claimed in claim 1, it is characterised in that the described brake pedal of described judgement also includes after breaking down: controls the travel speed of described electric automobile less than pre-set velocity, and lights trouble light.
3. electric vehicle brake pedal diagnostic method as claimed in claim 1, it is characterized in that, described judge that whether described first brake pedal switch state and described second brake pedal switch state be identical, including: when described brake pedal tips into or out, described first brake pedal switch state be triggering state and described second brake pedal switch state for not triggering state time, or when described first brake pedal switch state is not for trigger state, described second brake pedal switch state is triggering state and when brake pedal position signal magnitude of voltage is not in pre-set interval, judge that described first brake pedal switch state is different from described second brake pedal switch state.
4. electric vehicle brake pedal diagnostic method as claimed in claim 3, it is characterized in that, before the first brake pedal switch state of acquisition and the second brake pedal switch state, also include: obtaining the percent travel of brake pedal position, the percent travel of described acquisition brake pedal position includes:
Detect when described brake pedal position changes, obtain current brake pedal position signal voltage value; Obtain brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference within the scope of brake pedal effective travel;
According to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position.
5. electric vehicle brake pedal diagnostic method as claimed in claim 4, it is characterized in that, described according to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position, including: adopt ��=(U-U0)/�� U calculates the percent travel of current brake pedal position, and wherein, �� is the percent travel of current brake pedal position, and U is current brake pedal position signal voltage value, U0For initial position signal magnitude of voltage, �� U is the output voltage difference within the scope of brake pedal effective travel.
6. an electric vehicle brake pedal diagnostic equipment, it is characterised in that including:
First acquiring unit, is used for the first brake pedal switch state that obtains and the second brake pedal switch state; Judging unit, is used for judging that whether described first brake pedal switch state and described second brake pedal switch state be identical;
Second acquisition unit, for when described first brake pedal switch state is different from described second brake pedal switch state, obtain in N continuous time brake pedal operation process, the first corresponding brake pedal switch state and the second brake pedal switch state, a brake pedal operation is the operation loosened the brake after a brake pedal;
Identifying unit, for when in N continuous time brake pedal operation process, when corresponding described first brake pedal switch state is all incomplete same with described second brake pedal switch state, it is determined that described brake pedal breaks down.
7. the electric vehicle brake pedal diagnostic equipment as claimed in claim 6, it is characterized in that, also include: control unit, for after described identifying unit judges that described brake pedal breaks down, control the travel speed of described electric automobile less than pre-set velocity, and light trouble light.
8. the electric vehicle brake pedal diagnostic equipment as claimed in claim 6, it is characterized in that, obtain the first brake pedal switch state and the second brake pedal switch state at described first acquiring unit before, also include: stroke acquiring unit, for when detecting that described brake pedal position changes, obtaining current brake pedal position signal voltage value; Obtain brake pedal initial position signal magnitude of voltage when initial position and the output voltage difference within the scope of brake pedal effective travel; According to the output voltage difference within the scope of described current brake pedal position signal voltage value, initial position signal magnitude of voltage and described effective travel, calculate the percent travel of current brake pedal position.
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| CN108791060A (en) * | 2018-06-14 | 2018-11-13 | 安徽江淮汽车集团股份有限公司 | A kind of braking light switch method for diagnosing faults and device |
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| CN110341682A (en) * | 2019-07-31 | 2019-10-18 | 广州小鹏汽车科技有限公司 | Method for diagnosing faults and device for electric vehicle brake switch |
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| CN113246739A (en) * | 2021-06-17 | 2021-08-13 | 中国第一汽车股份有限公司 | Hybrid power vehicle and brake control method thereof |
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