CN102508154A - Fault diagnosis method for switch of brake pedal of pure electric automobile - Google Patents
Fault diagnosis method for switch of brake pedal of pure electric automobile Download PDFInfo
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- CN102508154A CN102508154A CN2011103348588A CN201110334858A CN102508154A CN 102508154 A CN102508154 A CN 102508154A CN 2011103348588 A CN2011103348588 A CN 2011103348588A CN 201110334858 A CN201110334858 A CN 201110334858A CN 102508154 A CN102508154 A CN 102508154A
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Abstract
The invention relates to a fault diagnosis method for a switch of a brake pedal of a pure electric automobile. According to the fault diagnosis method for the switch of the brake pedal of the pure electric automobile, the reasonability diagnosis on the signal is enhanced after a filter process is carried out on a digital signal of the switch of the brake pedal; and a high-frequency interference signal generated by the brake pedal or an manual operation is removed such that the reliability of the signal is ensured; and therefore, the safety of the whole pure electric automobile is more attended, and requirements on driving operation can be greatly ensured.
Description
Technical field
The invention belongs to vehicle part fault diagnosis and treatment technology, be specifically related to the fault diagnosis and the disposal route of brake pedal switching signal.
Background technology
The automobile brake pedal switching signal has reflected the demand of driver to the car load braking; It is the critical piece of driver's operating and controlling vehicle; The pure electric automobile entire car controller is understood driver's braking requirement through the brake pedal switching signal; And the brake pedal switching signal is the important input signal that braking energy feedback control enables, and this shows that the brake pedal signal directly has influence on the dynamic property and the security of car load.General digital signal determination methods is only carried out Filtering Processing to normal signal; To the rationality diagnostic of signal seldom, so need a kind of new diagnostic method, increase the rationality of signal is diagnosed; Thereby improve the car load security, simultaneously the more effective fault of judging the brake pedal switch.
Summary of the invention
The objective of the invention is based on brake pedal, design a kind of brake pedal switch fault diagnostic method that more helps the car load security.
Technical scheme of the present invention is following:
A kind of pure electric automobile brake pedal method for diagnosing faults, said method is divided following steps:
1, by the driver's operation brake pedal, the brake pedal switch is judged the brake pedal on off state through sensor, and converts this switching information the digital signal output of corresponding brake pedal switch to;
2, above-mentioned brake pedal switches digital is input to (hereinafter to be referred as HCU) in the entire car controller; At first carry out Filtering Processing through the Filtering Processing module; In this module; After surpassing the time t that sets when brake pedal switching signal effective time, just think brake pedal switch closure (the brake pedal switching signal is 1), otherwise just think the disconnection of brake pedal switch.Can the high-frequency interferencing signal of brake pedal or manual operation generation be removed like this, to guarantee the reliability of signal;
3, HCU diagnoses the brake pedal switching signal:
A, in step 2, judge the brake pedal switch break off (the brake pedal switching signal is 0) simultaneously the vehicle ' acceleration less than pre-set threshold value VS
Differ1(this pre-set threshold value is less than 0), and this process duration surpasses setting-up time t1, then judges vehicle brake pedal switch generation open failure in the Reduced Speed Now process, promptly brake pedal has been stepped on but the brake switch signal is 0;
B, in step 2, judge brake pedal switch closure (the brake pedal switching signal is 1); Simultaneously (VSMN is the preset lower limit threshold values of the speed of a motor vehicle to Vehicle Speed when accelerating to greater than VSMX less than VSMN; VSMX is a speed of a motor vehicle preset upper limit threshold values); Judge that then closed fault takes place vehicle brake pedal switch in the process of giving it the gun, when both brake pedal is not stepped on but the brake switch signal is 1;
C, if the brake pedal switch fault among above-mentioned steps A or the step B does not take place, then be judged as unfaulty conditions.If the brake pedal switch is diagnosed as non-fault, then with the actual braking requirement of brake pedal switch result as the driver; If the brake pedal switch has been diagnosed as fault, then HCU combines the accelerator pedal signal to handle according to the brake pedal switch fault simultaneously, the speed of a motor vehicle and whole vehicle functions is limited, and forbid that motor carries out braking energy and reclaims.And simultaneously through meter lamp, the prompting driver.
The inventive method has increased the rationality diagnostic to signal, more pays attention to the security of car load, can satisfy the demand of driver behavior better.
Description of drawings
Fig. 1 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with accompanying drawing further explain content of the present invention:
Fig. 1 has described the diagnostic process of entire car controller to the brake pedal switch, and is specific as follows:
1, by the driver's operation brake pedal, brake pedal is judged the brake pedal on off state through sensor, and converts this switching information the digital signal output of corresponding brake pedal switch to.
2, above-mentioned brake pedal switches digital is input in the entire car controller behind the HCU; At first carry out Filtering Processing through the Filtering Processing module; In this module; Surpass when brake pedal switching signal effective time (the hardware Acquisition Circuit sampling period parameter determining that the length of time t is chosen by controller) behind the time t that sets, just think brake pedal switch closure (the brake pedal switching signal is 1), otherwise just think the disconnection of brake pedal switch.Can the high-frequency interferencing signal of brake pedal or manual operation generation be removed like this, to guarantee the reliability of signal.
3, HCU diagnoses the brake pedal switching signal:
A, in step 2, judge the brake pedal switch break off (the brake pedal switching signal is 0) simultaneously the vehicle ' acceleration less than pre-set threshold value VS
Differ1(this pre-set threshold value is less than 0), and this process duration surpasses setting-up time t1, then judges vehicle brake pedal switch generation open failure in the Reduced Speed Now process, both brake pedal had been stepped on but the brake switch signal is 0.
B, in step 2, judge brake pedal switch closure (the brake pedal switching signal is 1); Simultaneously (VSMN is the preset lower limit threshold values of the speed of a motor vehicle to Vehicle Speed when accelerating to greater than VSMX less than VSMN; VSMX is a speed of a motor vehicle preset upper limit threshold values); Judge that then closed fault takes place vehicle brake pedal switch in the process of giving it the gun, when both brake pedal is not stepped on but the brake switch signal is 1.
B, if the brake pedal switch fault among above-mentioned steps A or the step B does not take place, then be judged as unfaulty conditions.If the brake pedal switch is diagnosed as non-fault, then with the actual braking requirement of brake pedal switch result as the driver; If the brake pedal switch has been diagnosed as fault, then HCU combines the accelerator pedal signal to handle according to the brake pedal switch fault simultaneously, the speed of a motor vehicle and whole vehicle functions is limited, and forbid that motor carries out braking energy and reclaims.And through meter lamp, the prompting driver.
Claims (2)
1. pure electric automobile brake pedal method for diagnosing faults is characterized in that: said method comprising the steps of:
(1) when the driver's operation brake pedal, the brake pedal switch is judged the brake pedal on off state through sensor, and converts this switching information to corresponding brake pedal switches digital;
(2) said brake pedal switches digital is input to entire car controller HCU; At first carry out Filtering Processing through the Filtering Processing module; Behind the brake pedal switching signal time t of effective time, think that just brake pedal switch closure, signal are 1 above setting; Otherwise just think that the brake pedal switch breaks off, signal is 0;
(3) HCU diagnoses the brake pedal switching signal:
A, in step (2), judge the brake pedal switch and break off, the vehicle ' acceleration is less than pre-set threshold value VS simultaneously
Differ1, VS
Differ1＜0, and this process duration surpasses setting-up time t1, then judges vehicle brake pedal switch generation open failure in the Reduced Speed Now process, promptly brake pedal has been stepped on but the brake switch signal is 0;
B, in step (2), judge the brake pedal switch closure; When Vehicle Speed accelerates to greater than speed of a motor vehicle preset upper limit threshold values VSMX from presetting lower limit threshold values VSMN less than the speed of a motor vehicle simultaneously; Judge that then closed fault takes place vehicle brake pedal switch in the process of giving it the gun, when promptly brake pedal is not stepped on but the brake switch signal is 1;
C, if the brake pedal switch fault among above-mentioned steps A or the step B does not take place, then be judged as unfaulty conditions; If the brake pedal switch is diagnosed as non-fault, then with the actual braking requirement of brake pedal switch result as the driver; If the brake pedal switch has been diagnosed as fault, then HCU combines the accelerator pedal signal to handle according to the brake pedal switch fault simultaneously, the speed of a motor vehicle and whole vehicle functions is limited, and forbid that motor carries out braking energy and reclaims.
2. pure electric automobile brake pedal method for diagnosing faults according to claim 1 is characterized in that: among the said step C, and when the brake pedal switch has been diagnosed as fault, through meter lamp, the prompting driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103348588A CN102508154A (en) | 2011-10-31 | 2011-10-31 | Fault diagnosis method for switch of brake pedal of pure electric automobile |
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| CN2011103348588A CN102508154A (en) | 2011-10-31 | 2011-10-31 | Fault diagnosis method for switch of brake pedal of pure electric automobile |
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| CN102508154A true CN102508154A (en) | 2012-06-20 |
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| CN2011103348588A Pending CN102508154A (en) | 2011-10-31 | 2011-10-31 | Fault diagnosis method for switch of brake pedal of pure electric automobile |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897117A (en) * | 2012-09-25 | 2013-01-30 | 北京智行鸿远汽车技术有限公司 | Brake pedal diagnostic method for hybrid electric vehicle |
| CN105620458A (en) * | 2014-11-28 | 2016-06-01 | 上海汽车集团股份有限公司 | Brake pedal position signal diagnosing method and device |
| CN105620459A (en) * | 2014-11-28 | 2016-06-01 | 上海汽车集团股份有限公司 | Electric vehicle brake pedal diagnosing method and device |
| CN106093758A (en) * | 2016-05-27 | 2016-11-09 | 奇瑞汽车股份有限公司 | A kind of automobile brake switch long duration test monitoring device and monitoring method |
| CN106662615A (en) * | 2014-08-08 | 2017-05-10 | 罗伯特·博世有限公司 | Dynamic stuck switch monitoring |
| CN107089140A (en) * | 2017-04-26 | 2017-08-25 | 北京新能源汽车股份有限公司 | A kind of fault detection method, device and the electric automobile of accelerator pedal mechanism |
| CN107402349A (en) * | 2017-07-31 | 2017-11-28 | 奇瑞汽车股份有限公司 | The just abnormal detection method of switch and device in a kind of vehicle |
| CN111907490A (en) * | 2020-07-23 | 2020-11-10 | 奇瑞商用车（安徽）有限公司 | Automobile brake pedal fault diagnosis method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897117A (en) * | 2012-09-25 | 2013-01-30 | 北京智行鸿远汽车技术有限公司 | Brake pedal diagnostic method for hybrid electric vehicle |
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| US10486713B2 (en) | 2014-08-08 | 2019-11-26 | Robert Bosch Gmbh | Dynamic stuck switch monitoring |
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| CN105620459A (en) * | 2014-11-28 | 2016-06-01 | 上海汽车集团股份有限公司 | Electric vehicle brake pedal diagnosing method and device |
| CN105620458B (en) * | 2014-11-28 | 2019-04-30 | 上海汽车集团股份有限公司 | Brake pedal position signal diagnostic method and device |
| CN105620459B (en) * | 2014-11-28 | 2018-06-29 | 上海汽车集团股份有限公司 | Electric vehicle brake pedal diagnostic method and device |
| CN106093758A (en) * | 2016-05-27 | 2016-11-09 | 奇瑞汽车股份有限公司 | A kind of automobile brake switch long duration test monitoring device and monitoring method |
| CN106093758B (en) * | 2016-05-27 | 2019-03-12 | 奇瑞汽车股份有限公司 | A kind of automobile brake switch endurance test monitoring device and monitoring method |
| CN107089140B (en) * | 2017-04-26 | 2019-03-15 | 北京新能源汽车股份有限公司 | A kind of fault detection method, device and the electric car of accelerator pedal mechanism |
| CN107089140A (en) * | 2017-04-26 | 2017-08-25 | 北京新能源汽车股份有限公司 | A kind of fault detection method, device and the electric automobile of accelerator pedal mechanism |
| CN107402349A (en) * | 2017-07-31 | 2017-11-28 | 奇瑞汽车股份有限公司 | The just abnormal detection method of switch and device in a kind of vehicle |
| CN111907490A (en) * | 2020-07-23 | 2020-11-10 | 奇瑞商用车（安徽）有限公司 | Automobile brake pedal fault diagnosis method and system |
| CN111907490B (en) * | 2020-07-23 | 2024-02-06 | 奇瑞商用车（安徽）有限公司 | Automobile brake pedal fault diagnosis method and system |
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Application publication date: 20120620 |