CN105398436A - Brake boosting system of vehicle and vehicle with same - Google Patents
Brake boosting system of vehicle and vehicle with same Download PDFInfo
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- CN105398436A CN105398436A CN201511028933.2A CN201511028933A CN105398436A CN 105398436 A CN105398436 A CN 105398436A CN 201511028933 A CN201511028933 A CN 201511028933A CN 105398436 A CN105398436 A CN 105398436A
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- braking
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Classifications
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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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
-
- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a brake boosting system of a vehicle, which comprises: a vacuum pump; a vacuum booster; a vacuum pressure sensor to detect a vacuum pressure value of the vacuum booster; and the controller is provided with an atmospheric pressure sensor to detect the atmospheric pressure value of the current environment, determines the starting threshold value and the closing threshold value of the vacuum pump according to the atmospheric pressure value and the vacuum pressure value of the vacuum booster detected by the vacuum pressure sensor, and controls the starting and the closing of the vacuum pump according to the starting threshold value and the closing threshold value of the vacuum pump. According to the brake boosting system provided by the embodiment of the invention, the starting threshold value and the closing threshold value of the vacuum pump are determined according to the atmospheric pressure value, so that the adaptability of the vehicle is improved on the premise of ensuring the performance and the reliability of the vehicle, and the use requirements of various working conditions are better met. The invention also discloses a vehicle.
Description
Technical field
The present invention relates to technical field of vehicle, particularly a kind of vehicle force aid system for braking and there is its vehicle.
Background technology
Force aid system for braking is the indispensable component part of vehicle, and especially for pure electric automobile, travelled by motor direct-drive, inside does not have driving engine, therefore cannot provide vacuum servo source as conventional fuel oil car by driving engine.
At present, the force aid system for braking of pure electric automobile generally adopts electric vacuum pump to be force aid system for braking extracting vacuum, namely startup and the closedown of vacuum pump is controlled according to the force value of force aid system for braking inside, thus make the degree of vacuum that force aid system inner sustain is enough, to ensure the braking requirement of chaufeur.Wherein, vacuum pump startup is generally taken as fixed value with the pressure threshold value of closing.
But, because the height above sea level difference of different regions is huge, cause fixing threshold values can not adapt to the height above sea level difference of various places well, and most domestic pure electric automobile is all according to the region of no relief design force aid system for braking of low altitude area, vehicle is caused to occur only adapting to Plain operating mode, and the problem of tableland circumstance bad adaptability, urgently to be resolved hurrily.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.
For this reason, one object of the present invention is the force aid system for braking proposing a kind of vehicle, and this system can improve the comformability of vehicle, meets the user demand of each operating mode better.
Another object of the present invention is to propose a kind of vehicle.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of force aid system for braking of vehicle, comprising: vacuum pump; The vacuum booster be connected with described vacuum pump with brake pedal; The vacuum pressure sensor be connected with described vacuum booster, for detecting the vacuum pressure value of described vacuum booster; And controller, described controller is connected with described vacuum pressure sensor with described vacuum pump respectively, described controller is provided with atmospheric-pressure sensor, to detect the atmospheric pressure value of current environment, the startup threshold values of the vacuum pressure value determination vacuum pump of the described vacuum booster that described controller detects according to described atmospheric pressure value and described vacuum pressure sensor with close threshold values, and according to the startup threshold values of described vacuum pump and startup and the closedown of closing threshold values and control described vacuum pump.
According to the force aid system for braking of the vehicle that the embodiment of the present invention proposes, vacuum pressure value is detected with the vacuum pressure sensor on vacuum booster by arranging, avoid the potential safety hazard because the reasons such as check valve blocking cause, and detect atmospheric pressure value by arranging with the atmospheric-pressure sensor in controller, thus by the startup threshold values of atmospheric pressure value determination vacuum pump with close threshold values, under the prerequisite ensureing vehicle performance and reliability, improve the comformability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce costs, improve the economy of vehicle.
In addition, the force aid system for braking of vehicle according to the above embodiment of the present invention can also have following additional technical characteristic:
Further, in one embodiment of the invention, described controller also comprises: for recording the timing module of described vacuum pump stream time, and described controller controls described vacuum pump and cuts out after described vacuum pump stream time reaches setting-up time.
Further, in one embodiment of the invention, said system also comprises: memory module, for prestoring the startup threshold values of force value and vacuum pump and closing threshold values relation table, described controller determines the startup threshold values of described vacuum pump and cut out threshold values according to the startup threshold values of described preset pressure value and vacuum pump with cut out threshold values relation table and described atmospheric pressure value.
Wherein, in one embodiment of the invention, receive the described force value of input and the startup threshold values of vacuum pump and close threshold values relation table, or, download the startup threshold values of described force value and vacuum pump from server end and close threshold values relation table.
Alternatively, in one embodiment of the invention, at least one check valve can be provided with between described vacuum pump and described vacuum booster.
Alternatively, in one embodiment of the invention, said system also comprises: the vacuum reservoir be connected with described vacuum booster, is provided with at least one check valve between described vacuum reservoir and described vacuum booster.
Alternatively, in one embodiment of the invention, described controller can be entire car controller.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of vehicle, and it comprises the force aid system for braking of above-mentioned vehicle.This vehicle can detect vacuum pressure value by arranging with the vacuum pressure sensor on vacuum booster, avoid the potential safety hazard because the reasons such as check valve blocking cause, and detect atmospheric pressure value by arranging with the atmospheric-pressure sensor in controller, thus by the startup threshold values of atmospheric pressure value determination vacuum pump with close threshold values, under the prerequisite ensureing vehicle performance and reliability, improve the comformability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce costs, improve the economy of vehicle.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the structural representation of the force aid system for braking of vehicle according to an embodiment of the invention;
Fig. 2 is the control flow chart of the vacuum pump according to an embodiment of the invention under the non-et out of order state of atmospheric-pressure sensor;
Fig. 3 is the control flow chart of the vacuum pump according to an embodiment of the invention under atmospheric-pressure sensor faulty condition.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Describe the force aid system for braking of the vehicle proposed according to the embodiment of the present invention with reference to the accompanying drawings and there is its vehicle, describing the force aid system for braking of the vehicle proposed according to the embodiment of the present invention first with reference to the accompanying drawings.
Fig. 1 is the structural representation of the force aid system for braking of the vehicle of one embodiment of the invention.
As shown in Figure 1, the force aid system for braking of this vehicle comprises: vacuum pump 100, vacuum booster 200, vacuum pressure sensor 300 and controller 400.
Wherein, vacuum booster 200 is connected with vacuum pump 100 with brake pedal.Vacuum pressure sensor 300 is connected with vacuum booster 200, and vacuum pressure sensor 300 is for detecting the vacuum pressure value of vacuum booster 200.Controller 400 is connected with vacuum pressure sensor 300 with vacuum pump 100 respectively, controller 400 is provided with atmospheric-pressure sensor 401, to detect the atmospheric pressure value of current environment, the startup threshold values of the vacuum pressure value determination vacuum pump 100 of the vacuum booster 200 that controller 400 detects according to atmospheric pressure value and vacuum pressure sensor 300 with close threshold values, and according to the startup threshold values of vacuum pump 100 and startup and the closedown of closing threshold values and control vacuum pump 100.
In an embodiment of the present invention, the force aid system for braking of the embodiment of the present invention adopts dual sensor scheme, comprise atmospheric-pressure sensor 401 and vacuum pressure sensor 300, all can ensure that force aid system for braking normally works in full sea level elevation region, the vacuum pump single work-hours occurred after there will not be general pure electric automobile to enter plateau increases problems such as even often turning, and detect vacuum pressure value by arranging with the vacuum pressure sensor 300 on vacuum booster 200, avoid the potential safety hazard because the reasons such as check valve blocking cause, under the prerequisite ensureing vehicle performance and reliability, improve the comformability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump 100 is controlled by controller 400, reduce costs, improve the economy of vehicle.
Alternatively, in one embodiment of the invention, as shown in Figure 1, at least one check valve (such as shown in check valve a) can be provided with between vacuum pump 100 and vacuum booster 200.
Alternatively, in one embodiment of the invention, as shown in Figure 1, the force aid system for braking of the embodiment of the present invention also comprises: vacuum reservoir 600.Wherein, vacuum reservoir 600 is connected with vacuum booster 200, can be provided with at least one check valve (such as shown in check valve b) between vacuum reservoir 600 and vacuum booster 200.
Alternatively, in one embodiment of the invention, controller 400 can be entire car controller.
In one particular embodiment of the present invention, as shown in Figure 1, vacuum pressure sensor 300 is disposed on vacuum booster 200, and vacuum booster 200 can provide brake boost demand for chaufeur.Controller 400 can gather vacuum pressure sensor 300 voltage signal by A/D interface, namely the vacuum pressure value of the vacuum booster 200 that vacuum pressure sensor 300 detects is obtained, obtain vacuum booster 200 internal vacuum pressure through signal resolution, namely obtain the vacuum pressure value of vacuum booster 200.Meanwhile controller 400 obtains the atmospheric pressure value of current environment now by built-in atmospheric-pressure sensor 401, afterwards according to certain control logic (as force value and vacuum pump startup threshold values with close threshold values relation table, can be described in detail below) drive vacuum pump 100 enable.Wherein, the electric current of vacuum pump 100 is driven can be produced by the driving chip that controller 400 is inner special.By the air of two check valves (as check valve a in figure and check valve b) extracting vacuum tank 600 with vacuum booster 200 inside, can ensure to provide degree of vacuum when vacuum pump 100 works.Vacuum reservoir 600 can provide degree of vacuum deposit for whole force aid system for braking, and especially when vacuum pump 100 does not work, the degree of vacuum in vacuum reservoir 600 can provide brake boost demand for chaufeur.In addition, controller 400 can judge according to state of the system and respond the fault (can be described in detail) of vacuum boost system below, to ensure traffic safety.
In an embodiment of the present invention, hardware cost can be reduced by Integrated design scheme.Work owing to directly controlling vacuum pump 100 by entire car controller, therefore eliminate special controller for vacuum pump, reduce hardware purchase cost; Second, for realizing the big current driving vacuum pump 100, controller can add special driving chip in the design for driving vacuum pump 100, the introducing of this driving chip achieves the automatic detection (fault detection is completed by driving chip) driving channel failure, eliminate other auxiliary circuit that vacuum pump drives path fault to detect, as current detection circuit etc., reduce cost, improve the reliability of detection simultaneously; 3rd, vacuum pressure sensor 300 is arranged on vacuum booster 200, ensure that the direct validity gathering vacuum-pressure signal, instead of on the vacuum reservoir of general pure electric automobile, (as degree of vacuum in vacuum reservoir is enough, vacuum pump does not reach startup threshold values, but causes degree of vacuum in vacuum booster 200 very low due to check valve blocking to avoid potential safety hazard because the reasons such as check valve blocking cause, cause providing brake boost, and then cause brake safe hidden danger); 4th, namely the start and stop vacuum pressure threshold values achieving vacuum pump 100 by introducing atmospheric-pressure sensor 401 starts threshold values and the dynamic conditioning of closing threshold values, and car brakeing force aid system is normally worked in each sea level elevation region.
Further, in one embodiment of the invention, the force aid system for braking of the embodiment of the present invention also comprises: memory module 500 (specifically not identifying in figure).Memory module 500 is for prestoring the startup threshold values of force value and vacuum pump and closedown threshold values relation table, and controller 400 is according to preset pressure value and the startup threshold values of vacuum pump and the startup threshold values of cut out threshold values relation table and atmospheric pressure value determination vacuum pump 100 and close threshold values.
Wherein, in one embodiment of the invention, the startup threshold values of force value and the vacuum pump inputted and closedown threshold values relation table is received, or, the startup threshold values of force value and vacuum pump and closedown threshold values relation table is downloaded from server end.
Be understandable that, above-mentioned according to certain control logic can be according to the startup threshold values of force value and vacuum pump with close threshold values relation table.Wherein, the startup threshold values of force value and vacuum pump can by technical personnel be write when dispatching from the factory with closedown threshold values relation table or download from server end, and can upgrade at any time.
In addition, the startup threshold values of force value and the vacuum pump force aid system for braking internal pressure that can obtain for the vacuum pressure value of the vacuum booster 200 detected according to atmospheric pressure value and vacuum pressure sensor 300 with the force value of closing in threshold values relation table.
Further, the control method of the force aid system for braking of the embodiment of the present invention comprises vacuum pump control policy and failure strategy two aspect, describes in detail below.
Fig. 2 is the control flow chart of the vacuum pump according to an embodiment of the invention under the non-et out of order state of atmospheric-pressure sensor.
As shown in Figure 2, under the non-et out of order state of atmospheric-pressure sensor, control policy comprises the following steps:
S201, vehicle powers on.
S202, judges whether force aid system for braking internal pressure is less than V_on, if so, then performs step S203; If not, then terminate.
S203, judges that whether vacuum pump 100 is enable, if so, then performs step S204; If not, then step S205 is performed.
S204, accumulative vacuum pump 100 work-hours.
S205, starts vacuum pump 100 and timing.
Particularly, first judge after vehicle powers on that whether force aid system for braking internal pressure is lower than startup threshold values V_on, if lower than startup threshold values V_on, judge that whether vacuum pump 100 is enable, if enable, continue to keep enabled state, if not enable, enable vacuum pump 100 is cumulative operation time also.Wherein, starting threshold values value V_on is fixed value, and unit is Patm.Defining the force value collected by the vacuum pressure sensor 300 of vacuum booster 200 is V_vac, and the force value collected by entire car controller interior atmospheric pressure sensor 401 is V_abs, then force aid system for braking internal pressure=| V_vac|/V_abs.
S206, judges whether force aid system for braking internal pressure is greater than V_off, if so, then terminates; If not, then continue to perform step S206.
S207, terminates.
Further, after vacuum pump 100 is enable, judges whether force aid system for braking internal pressure reaches and close threshold values V_off, close threshold values V_off if reach, it is enable to close vacuum pump.
But the startup threshold values that above-mentioned control policy achieves vacuum pump 100 can adjust along with the change tread of height above sea level with closedown threshold values, and then ensure that the normal work of force aid system for braking.Current most pure electric automobile (adopting electric vacuum pump as force aid system for braking vacuum source) all adopts single sensor solution, namely the vacuum pressure sensor information of force aid system for braking inside is only utilized to carry out the control of vacuum pump, the open and close threshold values that general employing is fixing, as pressure is opened lower than during 50kp, close (getting the absolute value of vacuum pressure) higher than during 70kp, above threshold values is only applicable to low altitude area.Suppose that vacuum pump evacuation ability is 90%, be then that the vacuum pressure in servo-unit is evacuated to 90kp by the most high energy in 100m area (corresponding atmospheric pressure value be about 100kp) at height above sea level, now vacuum pressure can be evacuated to 70kp there is not the prerequisite of the faults such as leakage at vacuum boost system under by vacuum pump, and namely vacuum pump quits work threshold values; If vehicle is in the area (corresponding atmospheric pressure value is about 73.7kp) of height above sea level 2500m, now vacuum pump is the highest can be evacuated to 66.33kp by the degree of vacuum in vacuum booster, if closing threshold values is still 70kp, the condition that out of reach is closed by vacuum pump, cause continuous firing, and then produce potential safety hazard (as service life of vacuum pump shortens even overheated burning).
But, there is not above problem in the force aid system for braking of the embodiment of the present invention, make V_on=0.5Patm, V_off=0.7Patm, be then 100m area (corresponding atmospheric pressure value be about 100kp) at height above sea level, according to current control policy, the pressure of vacuum booster 200 inside lower than vacuum pump 100 enable work time 50kp (absolute value), when pressure quits work higher than time 70kp (absolute value); And arrived the area (corresponding atmospheric pressure value is about 73.7kp) of height above sea level 2500m, the pressure of vacuum booster 200 inside lower than vacuum pump 100 enable work time 36.85kp (absolute value), when pressure quits work higher than vacuum pump 100 time 51.59kp (absolute value).
Control policy shown in Fig. 2 achieves the dynamic conditioning of vacuum pressure threshold values in the on off control of vacuum pump 100 (| V_vac|) by introducing atmospheric-pressure sensor 401, the force aid system for braking of vehicle is normally worked in full sea level elevation region.
Further, in one embodiment of the invention, controller 400 also comprises: timing module 402 (specifically not identifying in figure).Timing module 402 is for recording vacuum pump 100 stream time, and controller 400 controls vacuum pump 100 and cuts out after vacuum pump 100 stream time reaches setting-up time.
Fig. 3 is the control flow chart of the vacuum pump according to an embodiment of the invention under atmospheric-pressure sensor faulty condition.
That is, as shown in Figure 3, under atmospheric-pressure sensor faulty condition, control policy comprises the following steps:
S301, vehicle powers on.
S302, judges whether vacuum pressure is less than Ve_on, if so, then performs step S303; If not, then terminate.
After vehicle powers on, first judge vacuum booster 200 internal pressure that collected by vacuum pressure sensor 300 and vacuum pressure (taking absolute value) whether lower than the startup threshold values Ve_on of vacuum pump 100
S303, judges that whether vacuum pump 100 is enable, if so, then performs step S304; If not, then step S305 is performed.
S304, accumulative vacuum pump 100 work-hours.
S305, starts vacuum pump 100 and timing.
That is, when vacuum pressure is lower than Ve_on, judge that whether vacuum pump 100 is enable further, if not enable, start vacuum pump 100 and timing, if vacuum pump 100 is enable, continues to keep enabled state, record vacuum pump work-hours simultaneously
S306, judges whether vacuum pressure is greater than Ve_off, if so, then performs step S307; If not, then step S309 is performed.
S307, judges whether vacuum pump 100 work-hours is greater than setting-up time T, if so, then performs step S308; If not, then step S306 is performed.
S308, judges whether vacuum pressure is greater than Ve_on, if so, then performs step S309, if not, then performs step S306.
That is, when vacuum pressure is higher than Ve_off, close vacuum pump 100.Wherein, if vacuum pressure does not reach Ve_off, then judge whether this work-hours of vacuum pump 100 is greater than setting-up time T, if be greater than setting-up time T, continue to judge whether vacuum pressure is greater than Ve_on, if satisfy condition, close vacuum pump 100.Setting-up time can be arranged according to practical application.
S309, terminates.
That is, after generation atmospheric-pressure sensor 401 breaks down, control method shown in Fig. 2 will be no longer applicable, reason is the exact value that now can not obtain external atmospheric pressure, above control logic is caused effectively to perform, in this case employing single-sensor logic is controlled vacuum pump, namely only utilize vacuum pressure sensor 300 to detect the mode of operation of ethic information control vacuum pump 100.
Particularly, when after atmospheric-pressure sensor 401 et out of order, the mode of operation of vacuum pressure value to vacuum pump 100 adopting vacuum pressure sensor 300 to detect controls, wherein, startup threshold values and the closedown threshold values of vacuum pump 100 are respectively Ve_on and Ve_off, consider when vehicle be in highlands then vacuum pump 100 likely degree of vacuum can not be evacuated to Ve_off, the single work-hours strategy of vacuum pump 100 is introduced for this problem, when vacuum pump 100 continuous firing exceedes setting-up time T, then utilize Ve_on as the closedown threshold values of vacuum pump 100, namely the pressure when vacuum booster 200 inside closes vacuum pump 100 higher than during this value.Control policy shown in Fig. 3 can ensure the effective work of vehicle at the high altitude region force aid system for braking of certain limit, realizes the normal open and close of vacuum pump, prevents it from overheatedly owing to working long hours even causing damage.
In the above-described embodiments; the control policy of vacuum pump 100 is overall inseparable as one that realizes brake boost function with the failure strategy of brake system; control policy achieves the base control function of force aid system for braking, and perfect failure strategy then farthest can protect the safety of vehicle and driver and crew when et out of order.Therefore, the failure strategy of the embodiment of the present invention specifically can be as follows:
1. low vacuum fault
Fault triggering condition: the speed of a motor vehicle is greater than V and force aid system for braking internal pressure triggers this fault (the non-et out of order of atmospheric-pressure sensor) after also continuing 2 seconds lower than Plow; Or the speed of a motor vehicle be greater than V and the vacuum pressure of brake servo unit inside lower than Pe
lowand continue after 2 seconds, to trigger this fault (atmospheric-pressure sensor et out of order).
Failure recovery condition: the speed of a motor vehicle is less than or equal to V or force aid system for braking internal pressure higher than Phigh and continues this failure recovery (the non-et out of order of atmospheric-pressure sensor) after 2 seconds; Or the speed of a motor vehicle is less than or equal to V or brake servo unit internal pressure higher than Pehigh and continues this failure recovery (atmospheric-pressure sensor et out of order) after 2 seconds.
Fault handling mode: light braking system faults lamp, the short ring of alarm sound, limiting vehicle speed.
The introducing of this failure strategy ensure that the traffic safety when brake system degree of vacuum is lower, and this failure strategy gives two cover threshold values in addition, is respectively used to fault under normal and fault two states of atmospheric-pressure sensor and triggers and the judgement of recover condition.
2. vacuum pressure sensor fault
Fault triggering condition: the speed of a motor vehicle is greater than V and the vacuum pressure sensor voltage collected does not trigger this fault after valid interval also continues 2 seconds.
Failure recovery condition: car load re-powers.
Fault handling mode: light braking system faults lamp, the short ring of alarm sound, continues enable vacuum pump.
The traffic safety when introducing of this failure strategy ensure that vacuum pressure sensor lost efficacy, owing to cannot obtain the degree of vacuum in servo-unit, therefore continues enable vacuum pump, to ensure the brake boost demand of chaufeur.
3. vacuum pump drives path fault
Fault triggering condition: detect that vacuum pump flash drives passage et out of order (detecting this fault by driving the flash driving chip of vacuum pump in entire car controller) and continues to trigger this fault after 2 seconds.
Failure recovery condition: car load re-powers.
Fault handling mode: light braking system faults lamp, the short ring of alarm sound, limiting vehicle speed.
The introducing of this failure strategy ensure that traffic safety when driving path fault.
4. force aid system for braking leakage failure
Fault triggering condition: the speed of a motor vehicle is greater than V, vacuum pump is in enabled state and under chaufeur do not step on brake pedal condition, if 2 seconds internal pressures rise lower than P
minthen trigger this fault (the non-et out of order of atmospheric-pressure sensor); Or the speed of a motor vehicle is greater than V, vacuum pump is in enabled state and under chaufeur do not step on brake pedal condition, if 2 seconds internal pressures rise lower than Pe
minthen trigger this fault (atmospheric-pressure sensor et out of order).
Failure recovery condition: car load re-powers.
Fault handling mode: light braking system faults lamp, the short ring of alarm sound.
The traffic safety when introducing of this failure strategy ensure that force aid system for braking is revealed, this failure strategy gives two cover threshold values in addition, is respectively used to the judgement of fault triggering condition under normal and fault two states of atmospheric-pressure sensor.
5. atmospheric-pressure sensor fault
Fault triggering condition: the speed of a motor vehicle is greater than V and the atmospheric-pressure sensor voltage collected does not trigger this fault after valid interval also continues 2 seconds.
Failure recovery condition: car load re-powers.
Fault handling mode: light braking system faults lamp, utilizes vacuum pressure sensor information to control vacuum pump.
The introducing of this failure strategy serves warning function to chaufeur, because simple atmospheric-pressure sensor fault does not affect driving, therefore by means of only lighting not under command light, chaufeur is warned, but not remind chaufeur by the mode that alarm sound, speed limit etc. are more serious, and then ensure that the driving impression of passengers inside the car.
6. the normal rotation protection of vacuum pump
Fault triggering condition: vacuum pump stream time is more than Tlong.
Failure recovery condition: car load re-powers.
Fault handling mode: light braking system faults lamp, limiting vehicle speed, close vacuum pump after car speed is lower than V.
The introducing of this failure strategy ensure that system causes damage due to vacuum pump continuous firing.
In sum, the system of the embodiment of the present invention can adopt Integrated design scheme, and the data-handling capacity of relying on entire car controller powerful and interface resource, achieve the integrating control to vacuum pump, eliminate special controller, reduce hardware cost; In addition, for producing the larger current driving vacuum pump, entire car controller adds special driving chip in the design for driving vacuum pump, the introducing of this driving chip achieves the automatic detection to driving channel failure, eliminate other auxiliary circuit detecting and drive path fault, as current detection circuit etc., reduce cost, improve the reliability of detection simultaneously; 3rd, adopt dual sensor scheme, achieve the double check of force aid system for braking internal pressure and outside atmospheric pressure, coordinate corresponding control policy can ensure the normal work of this system in full altitude height areas; In addition, vacuum pressure sensor is arranged on vacuum booster by this force aid system for braking, instead of on the vacuum reservoir of general pure electric automobile, ensure that and gather the directly effective of vacuum-pressure signal, (in vacuum reservoir, degree of vacuum is enough to avoid the pressure detection hidden danger caused due to reasons such as check valve blockings in system, but because check valve blocking causes degree of vacuum in vacuum booster very low, now will have potential safety hazard).Therefore, the force aid system for braking that the present invention provides reduces cost under the prerequisite ensureing system performance and reliability, is highly suitable for economical pure electric automobile.
Further, (start and stop threshold values V_on and the V_off of control policy intermediate pump is fixed value according to the vacuum pressure threshold values of residing sea level elevation self-adaptative adjustment vacuum pump start and stop to achieve vehicle by introducing atmospheric pressure information, for V_on, when the vacuum pressure of force aid system for braking inside and the ratio of bar pressure | then enable vacuum pump when V_vac|/V_abs is less than V_on, along with the rising V_abs of height above sea level will decline, because threshold values V_on fixes, therefore V_vac follows decline, thus achieve Automatic adjusument), to ensure that force aid system for braking normally works, eliminate single prolongs operating time under altitude environment of electric vacuum pump that the Method for Single Sensor System that only configures vacuum pressure sensor causes due to fixing threshold values and continue enable phenomenon, protective effect is served to the life-span of vacuum pump, reduce the vacuum pump that causes owing to working long hours and the overheated potential safety hazard of drive system simultaneously.
Further, for ensureing the traffic safety under force aid system for braking faulty condition, the embodiment of the present invention also has the force aid system for braking failure strategy of integral framework, this failure strategy defines low vacuum fault, vacuum pressure sensor fault, vacuum pump drives path fault, force aid system for braking leakage failure and atmospheric-pressure sensor fault, above failure strategy matches with vacuum pump control policy, when a failure occurs it by instrument Warning light, alarm tone prompting prompting chaufeur, and determine whether this fault can be recovered according to the potential danger grade of fault, when hazard level acquires a certain degree, the safety of vehicle and driver and crew is ensured by the mode of vehicle being carried out to speed limit.The force aid system for braking failure strategy that the present invention provides can ensure the safety of vehicle and driver and crew preferably.
In addition, when there is atmospheric-pressure sensor fault, the information of servo-unit internal vacuum pressure sensor is utilized to control vacuum pump, owing to only there being vacuum pressure sensor information, therefore inevitably altitude acclimatization sex chromosome mosaicism is produced, namely likely degree of vacuum can not be evacuated to vacuum pump at highlands vacuum pump and close threshold values Ve_off, in control policy, introduce vacuum pump single work-hours strategy for this reason, when vacuum pump continuous firing exceedes certain hour, then utilize vacuum pump to open threshold values Ve_on and close threshold values as vacuum pump, namely the pressure when servo-unit inside closes vacuum pump higher than during this value, the method can ensure to eliminate the impact of altitude environment on system to greatest extent under force aid system for braking provides the prerequisite of effective power-assisted, the normal open and close of vacuum pump can be realized, prevent it from overheatedly owing to working long hours even causing damage.
According to the force aid system for braking of the vehicle that the embodiment of the present invention proposes, vacuum pressure value is detected with the vacuum pressure sensor on vacuum booster by arranging, avoid the potential safety hazard because the reasons such as check valve blocking cause, and detect atmospheric pressure value by arranging with the atmospheric-pressure sensor in controller, thus by the startup threshold values of atmospheric pressure value determination vacuum pump with close threshold values, under the prerequisite ensureing vehicle performance and reliability, improve the comformability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce costs, improve the economy of vehicle.In addition, the system of the embodiment of the present invention can ensure that force aid system for braking normally works, eliminate single prolongs operating time under altitude environment of electric vacuum pump that the Method for Single Sensor System that only configures vacuum pressure sensor causes due to fixing threshold values and continue enable phenomenon, protective effect is served to the life-span of vacuum pump, reduce the vacuum pump that causes owing to working long hours and the overheated potential safety hazard of drive system simultaneously, and the safety of vehicle and driver and crew can be ensured preferably by force aid system for braking failure strategy, and ensureing to eliminate the impact of altitude environment on system to greatest extent under force aid system for braking provides the prerequisite of effective power-assisted, the normal open and close of vacuum pump can be realized, prevent it from overheatedly owing to working long hours even causing damage.
In addition, embodiments of the invention also proposed a kind of vehicle, and this vehicle comprises the force aid system for braking of above-mentioned vehicle.This vehicle can detect vacuum pressure value by arranging with the vacuum pressure sensor on vacuum booster, avoid the potential safety hazard because the reasons such as check valve blocking cause, and detect atmospheric pressure value by arranging with the atmospheric-pressure sensor in controller, thus by the startup threshold values of atmospheric pressure value determination vacuum pump with close threshold values, under the prerequisite ensureing vehicle performance and reliability, improve the comformability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce costs, improve the economy of vehicle.In addition, this vehicle can also can ensure that force aid system for braking normally works, eliminate single prolongs operating time under altitude environment of electric vacuum pump that the Method for Single Sensor System that only configures vacuum pressure sensor causes due to fixing threshold values and continue enable phenomenon, protective effect is served to the life-span of vacuum pump, reduce the vacuum pump that causes owing to working long hours and the overheated potential safety hazard of drive system simultaneously, and the safety of vehicle and driver and crew can be ensured preferably by force aid system for braking failure strategy, and ensureing to eliminate the impact of altitude environment on system to greatest extent under force aid system for braking provides the prerequisite of effective power-assisted, the normal open and close of vacuum pump can be realized, prevent it from overheatedly owing to working long hours even causing damage.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " cw ", " conter clockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (8)
1. a force aid system for braking for vehicle, is characterized in that, comprising:
Vacuum pump;
The vacuum booster be connected with described vacuum pump with brake pedal;
The vacuum pressure sensor be connected with described vacuum booster, for detecting the vacuum pressure value of described vacuum booster; And
Controller, described controller is connected with described vacuum pressure sensor with described vacuum pump respectively, described controller is provided with atmospheric-pressure sensor, to detect the atmospheric pressure value of current environment, the startup threshold values of the vacuum pressure value determination vacuum pump of the described vacuum booster that described controller detects according to described atmospheric pressure value and described vacuum pressure sensor with close threshold values, and according to the startup threshold values of described vacuum pump and startup and the closedown of closing threshold values and control described vacuum pump.
2. the force aid system for braking of vehicle according to claim 1, is characterized in that, described controller also comprises:
For recording the timing module of described vacuum pump stream time, described controller controls described vacuum pump and cuts out after described vacuum pump stream time reaches setting-up time.
3. the force aid system for braking of vehicle according to claim 1, is characterized in that, also comprises:
Memory module, for prestoring the startup threshold values of force value and vacuum pump and closing threshold values relation table, described controller determines the startup threshold values of described vacuum pump and cut out threshold values according to the startup threshold values of described preset pressure value and vacuum pump with cut out threshold values relation table and described atmospheric pressure value.
4. the force aid system for braking of vehicle according to claim 3, it is characterized in that, receive the described force value of input and the startup threshold values of vacuum pump and close threshold values relation table, or, download the startup threshold values of described force value and vacuum pump from server end and close threshold values relation table.
5. the force aid system for braking of vehicle according to claim 1, is characterized in that, is provided with at least one check valve between described vacuum pump and described vacuum booster.
6. the force aid system for braking of vehicle according to claim 1, is characterized in that, also comprises:
The vacuum reservoir be connected with described vacuum booster, is provided with at least one check valve between described vacuum reservoir and described vacuum booster.
7. the force aid system for braking of vehicle according to claim 1, is characterized in that, described controller is entire car controller.
8. a vehicle, is characterized in that, comprising: the force aid system for braking of the vehicle as described in any one of claim 1-7.
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| CN201511028933.2A CN105398436A (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
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| CN201511028933.2A CN105398436A (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
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| CN201511028933.2A Pending CN105398436A (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
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| CN111873971A (en) * | 2020-07-30 | 2020-11-03 | 重庆长安汽车股份有限公司 | Vacuum power-assisted brake system of automobile |
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Application publication date: 20160316 |