CN102897117A - Brake pedal diagnostic method for hybrid electric vehicle - Google Patents
Brake pedal diagnostic method for hybrid electric vehicle Download PDFInfo
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- CN102897117A CN102897117A CN2012103621550A CN201210362155A CN102897117A CN 102897117 A CN102897117 A CN 102897117A CN 2012103621550 A CN2012103621550 A CN 2012103621550A CN 201210362155 A CN201210362155 A CN 201210362155A CN 102897117 A CN102897117 A CN 102897117A
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Abstract
The invention relates to a brake pedal diagnostic method for a hybrid electric vehicle. The brake pedal diagnostic method includes that a hybrid controller collects a brake pedal signal and a vehicle speed signal, and diagnostic logic judges that the brake signal goes wrong and reports a brake signal fault if the vehicle speed is originally smaller than V1, the brake signal is set all the time, but the vehicle speed exceeds V2. The brake pedal diagnostic method has the advantages that on the premise that the brake signal is continuously set, a brake pedal is detected according to changing conditions of the vehicle speed signal, and simultaneously, when the brake pedal diagnoses the fault, the vehicle can enter a limp home mode, so that vehicle operating safety is effectively protected.
Description
Technical field
The present invention relates to the Development of HEV Technology field, relate in particular to a kind of brake pedal diagnostic method of hybrid vehicle.
Background technology
Development along with science and technology; environment is on the hazard; minimizing is to the dependence of the energy; realize energy-saving and emission-reduction; become world economy sustainable development problem in the urgent need to address; in the world the attention of energy security and environmental protection problem constantly promoted, various countries require more and more stricter to automotive emissions.Hybrid vehicle, pure electric automobile have become the trend of current auto-domain development.Oil-electric vehicle combines motor and driving engine; realized rational energy saving and emission reduction effects for each position; idle stop, electric motor starting, intelligent charge, regenerative brake, motor power-assisted, the electronic mixed moving function such as creep; having relatively advantages of higher of the oil consumption of reduction, increase continual mileage, technology maturity, is the first-selected trend of present each large car company development.
Driving engine and motor are two propulsions source in the hybrid vehicle, the core that mixed moving power controller (HCU) is car load control, the main control of being responsible between coordination engine management system (EMS) and the electric machine controller (MCU), and and the moment of torsion of gearbox control system (TCU) coordinate, to realize good driving performance and the energy optimization of vehicle.
Wherein, the diagnostic method of brake pedal also is one of gordian technique in field of hybrid electric vehicles, and it is also making constant progress.In hybrid vehicle control, brake pedal is as one of most important input of car load moment of torsion, and the safe operation of vehicle is had significant impact.Brake pedal diagnostic logic by perfect can guarantee the safe operation of vehicle.
Summary of the invention
The brake pedal diagnostic method that the purpose of this invention is to provide a kind of hybrid vehicle with by brake pedal and vehicle speed signal, designs diagnostic logic, guarantees and can quote the brake pedal fault by failure-free, can not report fault by mistake simultaneously.
The objective of the invention is to be achieved through the following technical solutions:
A kind of brake pedal diagnostic method of hybrid vehicle, comprise: hybrid controller gathers brake pedal signal and vehicle speed signal, if the speed of a motor vehicle is originally less than V1, afterwards always set of brake signal, but the speed of a motor vehicle has surpassed V2, then diagnostic logic thinks that speed-slackening signal goes wrong, and quotes the speed-slackening signal fault; After diagnosing out the speed-slackening signal fault, vehicle enters limp-home mode, has effectively protected the safe in operation of vehicle.
Preferably, the scope of V1 is 5km/h ~ 10km/h, and the scope of V2 is 35km/h ~ 55km/h.
Beneficial effect of the present invention is: the present invention keeps under the prerequisite of set at brake signal, and the situation of change according to vehicle speed signal detects brake pedal; simultaneously; after brake pedal was diagnosed out this fault, vehicle can enter limp-home mode, effectively protected vehicle operating safety.
Description of drawings
The below is described in further detail the present invention with reference to the accompanying drawings.
Fig. 1 is the vehicle speed signal of brake pedal diagnostic method of the described a kind of hybrid vehicle of the embodiment of the invention and the curve synoptic diagram of brake signal.
The specific embodiment
The basic structure of hybrid vehicle is known by those skilled in the art to be known, gives unnecessary details no longer one by one at this.The brake pedal diagnostic method of hybrid vehicle is mainly controlled by the HCU on the hybrid vehicle and is finished.
As shown in Figure 1, in the brake pedal diagnostic method of this inventive embodiments, be divided into 3 different phase processes, can finish the diagnosis of brake pedal by this 3 stages.HCU need to have two paths of signals: speed-slackening signal and speed of a motor vehicle modulating signal.
Before will beginning diagnosis, before F/s t0, the speed of a motor vehicle of hybrid vehicle is lower, belongs to lower-speed state, and when just beginning to diagnose, the speed of a motor vehicle is less than V1, and brake pedal is in reset mode.
At t0 constantly, since the brake signal problem, brake signal set, and after a period of time, because the chaufeur stepping on accelerator pedal, vehicle has moment of torsion, and the speed of a motor vehicle begins to rise.
At t1 constantly, brake signal is always set still, and the speed of a motor vehicle has risen to V2 simultaneously.At this moment, diagnostic logic thinks that speed-slackening signal goes wrong, and quotes the speed-slackening signal fault.
After the moment, owing to diagnose out brake fault, controller to carry out the output of limit value moment of torsion, the speed of a motor vehicle remains unchanged or begins and descends at t1.
More than in 3 phase process, demarcate by this diagnostic method and to each V1 and V2, guarantee that brake pedal can quote fault by failure-free, can not report by mistake simultaneously, typically, the scope of V1 is 5km/h ~ 10km/h, the scope of V2 is 35km/h ~ 55km/h.
After diagnosing out this fault, vehicle enters limp-home mode, and actv. has been protected the safe in operation of vehicle.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, all drops within protection scope of the present invention.
Claims (3)
1. the brake pedal diagnostic method of a hybrid vehicle is characterized in that, comprising:
Hybrid controller gathers brake pedal signal and vehicle speed signal, if the speed of a motor vehicle originally less than V1, afterwards always set of brake signal, but the speed of a motor vehicle has surpassed V2, then diagnostic logic thinks that speed-slackening signal goes wrong, and quotes the speed-slackening signal fault.
2. the brake pedal diagnostic method of hybrid vehicle according to claim 1, it is characterized in that: the scope of V1 is 5km/h ~ 10km/h, the scope of V2 is 35km/h ~ 55km/h.
3. the brake pedal diagnostic method of hybrid vehicle according to claim 2, it is characterized in that: after diagnosing out the speed-slackening signal fault, vehicle enters limp-home mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103621550A CN102897117A (en) | 2012-09-25 | 2012-09-25 | Brake pedal diagnostic method for hybrid electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103621550A CN102897117A (en) | 2012-09-25 | 2012-09-25 | Brake pedal diagnostic method for hybrid electric vehicle |
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| CN102897117A true CN102897117A (en) | 2013-01-30 |
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| CN2012103621550A Pending CN102897117A (en) | 2012-09-25 | 2012-09-25 | Brake pedal diagnostic method for hybrid electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982646A (en) * | 2014-06-03 | 2014-08-13 | 盛瑞传动股份有限公司 | Method and system for controlling active limp home returning mode entering of automatic gearbox |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010024159A1 (en) * | 2000-02-19 | 2001-09-27 | Ian Faye | Method and device for diagnosing a brake switch |
| CN101947939A (en) * | 2010-09-30 | 2011-01-19 | 重庆长安汽车股份有限公司 | Method for diagnosing and processing faults of accelerator pedal of medium hybrid electric vehicle |
| CN102508154A (en) * | 2011-10-31 | 2012-06-20 | 重庆长安汽车股份有限公司 | Fault diagnosis method for switch of brake pedal of pure electric automobile |
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2012
- 2012-09-25 CN CN2012103621550A patent/CN102897117A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010024159A1 (en) * | 2000-02-19 | 2001-09-27 | Ian Faye | Method and device for diagnosing a brake switch |
| CN101947939A (en) * | 2010-09-30 | 2011-01-19 | 重庆长安汽车股份有限公司 | Method for diagnosing and processing faults of accelerator pedal of medium hybrid electric vehicle |
| CN102508154A (en) * | 2011-10-31 | 2012-06-20 | 重庆长安汽车股份有限公司 | Fault diagnosis method for switch of brake pedal of pure electric automobile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982646A (en) * | 2014-06-03 | 2014-08-13 | 盛瑞传动股份有限公司 | Method and system for controlling active limp home returning mode entering of automatic gearbox |
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Application publication date: 20130130 |