CN103350693A - Method for improving brake vacuum degree - Google Patents
Method for improving brake vacuum degree Download PDFInfo
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- CN103350693A CN103350693A CN2013103200984A CN201310320098A CN103350693A CN 103350693 A CN103350693 A CN 103350693A CN 2013103200984 A CN2013103200984 A CN 2013103200984A CN 201310320098 A CN201310320098 A CN 201310320098A CN 103350693 A CN103350693 A CN 103350693A
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Abstract
The invention discloses a method for improving the brake vacuum degree. According to the method for improving the brake vacuum degree, the control parameters of an engine electronic fuel injection system and the associative functions of a control logic are utilized, control over the operation parameters of an engine, load of electric appliances and the like are combined, and therefore the pressure of an engine intake manifold is optimized when the engine is low in temperature and at idle through measures including optimizing VVT intake phase characteristic parameters, air-conditioner control logic characteristic parameters, optimizing the steering load and the like. Therefore, the brake vacuum degree is improved and the brake efficiency of an automobile in a high-altitude area is improved.
Description
Technical field
The invention belongs to the vehicle chassis technology field, be specifically related to the optimal design of brake vacuum degree.
Background technology
Current automobile (manned vehicle) brake system major part all adopts master cylinder band servo-unit assembly to carry out servoaction, and wherein master brake cylinder is the key components and parts that brake fluid pressure is provided to brake circuit.Vacuum booster is that the negative pressure of utilizing driving engine to provide is augmented the parts that the driver puts on the power on the brake pedal, thereby saves the important spare part of driver's muscle power.If driving engine can not provide enough degree of vacuum to vacuum booster, effort in the time of can causing chaufeur to brake, in case of emergency potential safety hazard may appear, these all are because lower the causing of degree of vacuum that driving engine provides becomes problem in the urgent need to address therefore optimize and improve the brake vacuum degree after all.
The degree of vacuum of vacuum booster is provided by driving engine at present, if it is more that driving engine offers the power of other parts (air-conditioning compressor, electrical generator, power steerig pump, turbine transformer etc.), the power of leaving vacuum booster for will be less, can cause the brake vacuum degree not enough, cause braking to be hardened poor with brake efficiency.
Summary of the invention
The invention provides a kind of method of improving the brake vacuum degree, by optimizing the measures such as VVT air inlet phase characteristic parameter, air-conditioning control logic characteristic parameter and optimization steering load, improve and optimize the brake vacuum degree.
Technical scheme of the present invention is as follows:
A kind of method of improving the brake vacuum degree, it comprises the steps:
1, sets up control Map, the control Map of engine target idling speed, the control Map of engine breathing phase place (VVT) of driving engine basis spark advance angle according to the rate of load condensate of sea level elevation (atmospheric environmental pressure), driving engine, water temperature etc.
2, according to the calculating of sea level elevation (atmospheric environmental pressure) and brake efficiency, set up the chart of the required minimum brake vacuum degree of each sea level elevation;
3, set up air-conditioning according to automatically controlled logics such as brake signal, engine intake manifold pressure signal, turn sign, engine rotational speed signal, vehicle speed signal and cut off logic;
Cut off the threshold values condition of air-conditioning degree of vacuum:
4, at different altitude height areas (such as 2800m, 3500m, 4100m, 4700m etc.) above-mentioned parameter (spark advance angle, target idling speed, VVT target phase angles etc.) is optimized coupling, in same horsepower output situation, reduce the air-distributor pressure under the engine idle limiting condition, improve the brake vacuum degree.
5, on the basis of step 4, the associated gate limit value of the cut-out logic of coupling air-conditioning compressor, reduce engine load by cutting off the air-conditioning compressor load at some specific operation (refer to the hot and cold car limit, vehicle open all loads), thereby reduce the air-distributor pressure under the engine idle limiting condition, improve the brake vacuum degree.
After finishing, every suboptimization carries out experimental test:
(cooling-liquid temperature is about 20 ℃ during cold car for driving engine, cooling-liquid temperature is about 80 ℃ during hot car) start after, carry out pressure of foundation (P shelves, without any load), idling D shelves Parking (divide and turn on the aircondition, close two kinds of limiting conditions of air-conditioning), driving or R shelves reversing limiting condition engine intake manifold and the test of servo-unit end air pressure, record the pressure variation of engine intake manifold and servo-unit end in this process, and the brake efficiency of this process carried out subjective assessment, record simultaneously the test figures under each height above sea level and the operating mode; If do not satisfy the degree of vacuum requirement, then re-start step 3-step 5, require until satisfy degree of vacuum.
This method needs in the situation that the EFI Data Matching does not affect other parts and system performance adjustment and optimization characteristics parameter after finishing, to reach the purpose of improving and optimizing the brake vacuum degree.Brake vacuum degree final appraisal results are determined with plateau master, the objective evaluation method that combines.
This method is utilized the correlation function in engine electric spray system control parameter and the control logic, the control of binding engine operational factor, electric appliance load etc., by optimizing the engine intake manifold pressure of driving engine when the low temperature idling, and then improve the brake vacuum degree, improved the brake efficiency of vehicle at high altitude region.
Description of drawings
Fig. 1 is degree of vacuum optimal control figure;
Fig. 2 a is 300 meters of region of no relief height above sea level, bar pressure: plateau degree of vacuum is optimized objective examination result under the 96kpa state;
Fig. 2 b is the highlands: 2880 meters of height above sea level, and bar pressure: plateau degree of vacuum is optimized objective examination result under the 71kpa state;
Fig. 2 c is the highlands: 3500 meters of height above sea level, and bar pressure: plateau degree of vacuum is optimized objective examination result under the 66kpa state;
Fig. 2 d is the highlands: 4100 meters of height above sea level, and bar pressure: plateau degree of vacuum is optimized objective examination result under the 62kpa state;
Among the above figure, P_B represents servo-unit end collector pressure; P_EN represents driving engine end air-distributor pressure; Pedal_F represents treadle effort.
The specific embodiment
In order to make those skilled in the art understand better technical scheme, the present invention is further elaborated below in conjunction with accompanying drawing:
Referring to Fig. 1, optimize degree of vacuum and carry out as follows:
1, sets up the control Map(method for building up of control Map, engine breathing phase place (VVT) of control Map, the engine target idling speed of driving engine basis spark advance angle according to the rate of load condensate of sea level elevation (atmospheric environmental pressure), driving engine, water temperature etc. concrete with reference to " automobile theory " the 5th edition, " automobile electronic fuel oil jet Data Base present principles ").
2, according to the calculating of sea level elevation (atmospheric environmental pressure) and brake efficiency, set up the chart (method for building up is concrete with reference to " automobile theory " the 5th edition, " automobile electronic fuel oil jet Data Base present principles ") of the required minimum brake vacuum degree of each sea level elevation:
3, set up air-conditioning according to automatically controlled logics such as brake signal, engine intake manifold pressure signal, turn sign, engine rotational speed signal, vehicle speed signal and cut off logic (method for building up is concrete with reference to " automobile theory " the 5th edition, " automobile electronic fuel oil jet Data Base present principles "): cut off air-conditioning degree of vacuum threshold values condition:
4, at different altitude height areas (such as 2800m, 3500m, 4100m, 4700m etc.) above-mentioned parameter (spark advance angle, target idling speed, VVT target phase angles etc.) is optimized coupling and (improves spark advance angle, reduce idling speed according to signals such as the speed of a motor vehicle), in same horsepower output situation, reduce the air-distributor pressure under the engine idle limiting condition, improve the brake vacuum degree:
5, on the basis of step 4, (threshold value is seen the form in the step 3 to the associated gate limit value of the cut-out logic of coupling air-conditioning compressor, different according to the different threshold values of sea level elevation), reduce engine load by cutting off the air-conditioning compressor load at some specific operation (such as limiting condition), thereby reduce the air-distributor pressure under the engine idle limiting condition, improve the brake vacuum degree.
Below being certain vehicle in Chang'an, opening control logic, air-conditioning control logic, D(R by optimizing VVT) shelves target idling, spark advance angle etc. optimize the brake vacuum degree, and concrete Optimized Measures sees attached list 1
Subordinate list 1: optimize logic
Behind EFI control logic Optimization about control parameter, the objective performance of brake vacuum degree under each sea level elevation idling driving limiting condition is as follows:
The A301 vehicle is cut off air-conditioning through optimizing engine electric spray system control parameter and control logic in good time, has improved brake vacuum degree under the high height above sea level, and actv. has solved braking and hardened, and has improved brake efficiency; As follows through A301 vehicle plateau brake vacuum degree car load performance after optimizing:
3500m: cold car 1/R shelves full load mode Venturi tube promotes degree of vacuum 15kpa at 5s in the time, vacuum booster end degree of vacuum reaches 27kpa, and brake efficiency is better; Promote degree of vacuum 12kpa in the hot car 1/R shelves full load mode 5s time, servo-unit end degree of vacuum reaches 31kpa, and brake efficiency is better;
4100m: cold car 1/R shelves full load mode Venturi tube promotes degree of vacuum 8kpa in 5s, servo-unit end degree of vacuum reaches 17kpa, and brake efficiency is better; Promote degree of vacuum 10kpa in the hot car 1/R shelves full load mode 5s time, servo-unit end degree of vacuum reaches 23～26kpa, and brake efficiency is better.
Subordinate list 2: plateau brake vacuum degree car load performance Acceptable criterion:
Subordinate list 3: Plain brake vacuum degree car load performance Acceptable criterion:
Subordinate list 4: the automatically controlled logic that affects in the face of the brake vacuum degree in logic
The present embodiment is a kind of specific implementation of the present invention, is not the restriction to this patent, and other all unsubstantialities on this basis change, as long as this change does not break away from the essence of this patent, still fall within the protection domain of this patent.
Claims (6)
1. method of improving the brake vacuum degree, it comprises the steps:
(1) sets up control Map, the control Map of engine target idling speed, the control Map of engine breathing phase place (VVT) of driving engine basis spark advance angle according to rate of load condensate, the water temperature of sea level elevation, driving engine;
(2) according to the calculating of sea level elevation and brake efficiency, set up the chart of the required minimum brake vacuum degree of each sea level elevation;
(3) set up air-conditioning according to brake signal, engine intake manifold pressure signal, turn sign, engine rotational speed signal, vehicle speed signal and cut off logic;
(4) be that spark advance angle, target idling speed, VVT target phase angles are optimized coupling at different altitude height areas to above-mentioned parameter, namely in the situation that vacuum degree deficiency, improve spark advance angle, reduce idling speed according to signals such as the speed of a motor vehicle, increase the VVT target phase angles and come gas clean-up, in same horsepower output situation, reduce the air-distributor pressure under the engine idle limiting condition like this, improve the brake vacuum degree:
(5) on the basis of step (4), the associated gate limit value of the cut-out logic of coupling air-conditioning compressor, cut off the air-conditioning compressor load by some specific operation and reduce engine load, thereby reduce the air-distributor pressure under the engine idle limiting condition, improve the brake vacuum degree; Described specific operation refers to that the hot and cold car limit, vehicle open all loads.
2. the method for improving the brake vacuum degree according to claim 1, improve the method for brake vacuum degree by optimizing VVT air inlet phase, air-conditioning and steering load control logic, it is characterized in that: describedly set up air-conditioning to cut off the threshold values condition of cut-out air-conditioning degree of vacuum of logic as follows:
3. the method for improving the brake vacuum degree according to claim 1 and 2, it is characterized in that: need carry out experimental test after described every suboptimization is finished, test method is as follows:
Behind the engine starting, order according to pressure of foundation, the Parking of idling D shelves, driving or R shelves reversing limiting condition is carried out engine intake manifold and the test of servo-unit end air pressure, record the pressure variation of engine intake manifold and servo-unit end in this process, and the brake efficiency of this process estimated, record simultaneously the test figures such as pressure, engine speed of engine intake manifold under each height above sea level and the operating mode and servo-unit end; If do not satisfy the degree of vacuum requirement, then re-start step 3-step 5, require until satisfy degree of vacuum;
The condition of described engine starting is: cooling-liquid temperature is about 20 ℃ during cold car, and cooling-liquid temperature is about 80 ℃ during hot car;
Described pressure of foundation refers to the P shelves, the pressure during without any load; The Parking of described idling D shelves divides turns on the aircondition and closes two kinds of limiting conditions of air-conditioning.
4. the method for improving the brake vacuum degree according to claim 3 is characterized in that: described method is for the driving engine with VVT and HPS configuration.
5. the method for improving the brake vacuum degree according to claim 3 is characterized in that: the Optimized Measures that described step (2)-carry out (5) all needs to carry out matching optimization on the plateau and verifies to determine the final optimization pass parameter.
6. the method for improving the brake vacuum degree according to claim 3, it is characterized in that: described method must be carried out after the EFI Data Matching is finished.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103895636A (en) * | 2013-12-19 | 2014-07-02 | 上海汽车集团股份有限公司 | Method for controlling vacuum degree of automobile brake boosting system |
| CN104842987A (en) * | 2015-04-01 | 2015-08-19 | 北京新能源汽车股份有限公司 | Vacuum booster system of electric automobile and pressure measurement method of system |
| CN105235669A (en) * | 2015-10-30 | 2016-01-13 | 北京新能源汽车股份有限公司 | Braking assistance control system, control method thereof and vehicle |
| CN105404782A (en) * | 2015-11-27 | 2016-03-16 | 郑州比克新能源汽车有限公司 | Calculation method of vacuum degree in car braking process |
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Assist brake system of vehicle and vehicle provided with same |
| CN106080565A (en) * | 2016-07-06 | 2016-11-09 | 北京长安汽车工程技术研究有限责任公司 | The control method of a kind of pure electric vehicle vacuum boost system and device |
| CN107228770A (en) * | 2017-05-27 | 2017-10-03 | 重庆长安汽车股份有限公司 | The very hot regional special test method of whole-vehicle air-conditioner cut-out |
| CN107490491A (en) * | 2017-07-28 | 2017-12-19 | 重庆长安汽车股份有限公司 | Vehicle damped condition air-conditioning cuts off the engine bench test system and method for testing of situation |
| CN107554508A (en) * | 2017-08-16 | 2018-01-09 | 北京汽车研究总院有限公司 | A kind of vehicle active safety control method, apparatus and automobile |
| CN107571718A (en) * | 2016-07-04 | 2018-01-12 | 现代自动车株式会社 | Vehicle compressor control device and control method |
| CN110621526A (en) * | 2017-05-16 | 2019-12-27 | 日产自动车株式会社 | Control method for vehicle air conditioner and vehicle air conditioner |
| CN110979300A (en) * | 2019-12-25 | 2020-04-10 | 奇瑞汽车股份有限公司 | Method and device for adjusting brake vacuum degree and storage medium |
| CN111016904A (en) * | 2019-12-30 | 2020-04-17 | 吉利汽车研究院（宁波）有限公司 | Oil saving method based on vacuum degree signal |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103895636A (en) * | 2013-12-19 | 2014-07-02 | 上海汽车集团股份有限公司 | Method for controlling vacuum degree of automobile brake boosting system |
| CN103895636B (en) * | 2013-12-19 | 2016-03-23 | 上海汽车集团股份有限公司 | Automobile brake force aid system vacuum degree control method |
| CN104842987A (en) * | 2015-04-01 | 2015-08-19 | 北京新能源汽车股份有限公司 | Vacuum booster system of electric automobile and pressure measurement method of system |
| CN105235669A (en) * | 2015-10-30 | 2016-01-13 | 北京新能源汽车股份有限公司 | Braking assistance control system, control method thereof and vehicle |
| CN105404782A (en) * | 2015-11-27 | 2016-03-16 | 郑州比克新能源汽车有限公司 | Calculation method of vacuum degree in car braking process |
| CN105404782B (en) * | 2015-11-27 | 2018-04-03 | 郑州比克新能源汽车有限公司 | The computational methods of vacuum during a kind of car brake |
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Assist brake system of vehicle and vehicle provided with same |
| CN107571718B (en) * | 2016-07-04 | 2022-02-25 | 现代自动车株式会社 | Vehicle compressor control apparatus and control method |
| CN107571718A (en) * | 2016-07-04 | 2018-01-12 | 现代自动车株式会社 | Vehicle compressor control device and control method |
| CN106080565A (en) * | 2016-07-06 | 2016-11-09 | 北京长安汽车工程技术研究有限责任公司 | The control method of a kind of pure electric vehicle vacuum boost system and device |
| US10899354B2 (en) | 2017-05-16 | 2021-01-26 | Nissan Motor Co., Ltd. | Control method for vehicle air conditioning, and vehicle air conditioning device |
| CN110621526B (en) * | 2017-05-16 | 2021-03-30 | 日产自动车株式会社 | Control method for vehicle air conditioner and vehicle air conditioner |
| CN110621526A (en) * | 2017-05-16 | 2019-12-27 | 日产自动车株式会社 | Control method for vehicle air conditioner and vehicle air conditioner |
| CN107228770A (en) * | 2017-05-27 | 2017-10-03 | 重庆长安汽车股份有限公司 | The very hot regional special test method of whole-vehicle air-conditioner cut-out |
| CN107490491A (en) * | 2017-07-28 | 2017-12-19 | 重庆长安汽车股份有限公司 | Vehicle damped condition air-conditioning cuts off the engine bench test system and method for testing of situation |
| CN107490491B (en) * | 2017-07-28 | 2019-05-03 | 重庆长安汽车股份有限公司 | The engine bench test system and test method of vehicle damped condition air-conditioning cutting situation |
| CN107554508A (en) * | 2017-08-16 | 2018-01-09 | 北京汽车研究总院有限公司 | A kind of vehicle active safety control method, apparatus and automobile |
| CN110979300A (en) * | 2019-12-25 | 2020-04-10 | 奇瑞汽车股份有限公司 | Method and device for adjusting brake vacuum degree and storage medium |
| CN111016904A (en) * | 2019-12-30 | 2020-04-17 | 吉利汽车研究院（宁波）有限公司 | Oil saving method based on vacuum degree signal |
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Application publication date: 20131016 |