CN205344865U - 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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- CN205344865U CN205344865U CN201521130008.6U CN201521130008U CN205344865U CN 205344865 U CN205344865 U CN 205344865U CN 201521130008 U CN201521130008 U CN 201521130008U CN 205344865 U CN205344865 U CN 205344865U
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Abstract
The utility model provides a braking helping hand system of vehicle, include: 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. The utility model discloses braking helping hand system, the start-up threshold value of vacuum pump is confirmed through atmospheric pressure value and the threshold value is closed, under the prerequisite of guaranteeing vehicle performance and reliability, improves the adaptability of vehicle, satisfies the user demand of each operating mode better. The utility model also discloses a vehicle.
Description
Technical field
This utility model relates to technical field of vehicle, particularly to the force aid system for braking of a kind of vehicle and the vehicle with it.
Background technology
Force aid system for braking is the indispensable ingredient of vehicle, especially for pure electric automobile, is directly driven by a motor traveling, and inside does not have electromotor, therefore cannot provide vacuum servo source as conventional fuel oil car by electromotor.
At present, the commonly used electric vacuum pump of force aid system for braking of pure electric automobile is force aid system for braking extracting vacuum, namely the force value within force aid system for braking controls startup and the closedown of vacuum pump, so that the vacuum that the internal maintenance of force aid system is enough, to ensure the braking requirement of driver.Wherein, the pressure threshold value that vacuum pump starts with closedown is generally taken as fixed value.
But, owing to the height above sea level difference of different regions is huge, cause that fixing threshold values can not be well adapted for the height above sea level difference of various places, and most domestic pure electric automobile all designs force aid system for braking according to the plains region of low altitude area, cause that Plain operating mode occurs only adapting in vehicle, and the problem of tableland circumstance bad adaptability, it would be highly desirable to solve.
Utility model content
One of technical problem that this utility model is intended to solve in correlation technique at least to a certain extent.
For this, a purpose of the present utility model is in that to propose the force aid system for braking of a kind of vehicle, and this system can improve the adaptability of vehicle, meets the user demand of each operating mode better.
Another purpose of the present utility model is in that to propose a kind of vehicle.
For reaching above-mentioned purpose, this utility model proposes the force aid system for braking of a kind of vehicle on the one hand, including: vacuum pump；The vacuum booster being connected with brake pedal and described vacuum pump；The vacuum pressure sensor being connected with described vacuum booster, for detecting the vacuum pressure value of described vacuum booster；And controller, described controller is connected with described vacuum pump and described vacuum pressure sensor respectively, described controller is provided with barometric pressure sensor, to detect the atmospheric pressure value of current environment, the vacuum pressure value of the described vacuum booster that described controller detects according to described atmospheric pressure value and described vacuum pressure sensor is determined the startup threshold values of vacuum pump and closes threshold values, and starting threshold values and closing startup and the closedown of the threshold values described vacuum pump of control according to described vacuum pump.
Force aid system for braking according to the vehicle that the utility model proposes, by arranging and the vacuum pressure sensor detection vacuum pressure value on vacuum booster, avoid the potential safety hazard owing to the reasons such as check valve blocking cause, and by arranging and the barometric pressure sensor detection atmospheric pressure value in controller, startup threshold values and the closedown threshold values of vacuum pump is determined thereby through atmospheric pressure value, under ensureing the premise of vehicle performance and reliability, improve the adaptability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce cost, improve the economy of vehicle.
Further, described controller also includes: for recording the timing module of described vacuum pump stream time, and described controller controls described vacuum pump after described vacuum pump stream time reaches the setting time and cuts out.
Further, said system also includes: 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 with cut out threshold values relation table and described atmospheric pressure value according to the threshold values that starts of described preset pressure value and vacuum pump and cuts out threshold values.
Wherein, receive startup threshold values and the closedown threshold values relation table of described force value and the vacuum pump inputted, or, startup threshold values and the closedown threshold values relation table of described force value and vacuum pump is downloaded from server end.
Alternatively, at least one check valve can be provided with between described vacuum pump and described vacuum booster.
Alternatively, said system also includes: the vacuum tank being connected with described vacuum booster, is provided with at least one check valve between described vacuum tank and described vacuum booster.
Alternatively, described controller can be entire car controller.
For reaching above-mentioned purpose, this utility model proposes a kind of vehicle on the other hand, and it includes the force aid system for braking of above-mentioned vehicle.This vehicle can pass through to arrange and the vacuum pressure sensor detection vacuum pressure value on vacuum booster, avoid the potential safety hazard owing to the reasons such as check valve blocking cause, and by arranging and the barometric pressure sensor detection atmospheric pressure value in controller, startup threshold values and the closedown threshold values of vacuum pump is determined thereby through atmospheric pressure value, under ensureing the premise of vehicle performance and reliability, improve the adaptability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce cost, improve the economy of vehicle.
Aspect and advantage that this utility model is additional will part provide in the following description, and part will become apparent from the description below, or is recognized by practice of the present utility model.
Accompanying drawing explanation
This utility model above-mentioned and/or that add aspect and advantage will be apparent from easy to 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 the vehicle according to one embodiment of this utility model；
Fig. 2 is that the barometric pressure sensor according to one embodiment of this utility model does not break down the control flow chart of the vacuum pump under state；
Fig. 3 is the control flow chart of the vacuum pump under the barometric pressure sensor malfunction according to one embodiment of this utility model.
Detailed description of the invention
Being described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to be used for explaining this utility model, and it is not intended that to restriction of the present utility model.
Describe the force aid system for braking of the vehicle according to the proposition of this utility model embodiment with reference to the accompanying drawings and there is its vehicle, describing the force aid system for braking of the vehicle proposed according to this utility model embodiment 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 this utility model.
As it is shown in figure 1, the force aid system for braking of this vehicle includes: vacuum pump 100, vacuum booster 200, vacuum pressure sensor 300 and controller 400.
Wherein, vacuum booster 200 is connected with brake pedal and vacuum pump 100.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 pump 100 and vacuum pressure sensor 300 respectively, controller 400 is provided with barometric pressure sensor 401, to detect the atmospheric pressure value of current environment, the vacuum pressure value of the vacuum booster 200 that controller 400 detects according to atmospheric pressure value and vacuum pressure sensor 300 is determined the startup threshold values of vacuum pump 100 and closes threshold values, and starting threshold values and closing startup and the closedown of threshold values control vacuum pump 100 according to vacuum pump 100.
In embodiment of the present utility model, the force aid system for braking of this utility model embodiment adopts dual sensor scheme, including barometric pressure sensor 401 and vacuum pressure sensor 300, all ensure that force aid system for braking normal operation in full height above sea level region, do not have the problems such as the vacuum pump single working time growth occurred after general pure electric automobile enters plateau even often turns, and detect vacuum pressure value by arranging with the vacuum pressure sensor 300 on vacuum booster 200, avoid the potential safety hazard owing to the reasons such as check valve blocking cause, under ensureing the premise of vehicle performance and reliability, improve the adaptability 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 cost, improve the economy of vehicle.
Alternatively, in an embodiment of the present utility model, as it is 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 an embodiment of the present utility model, as it is shown in figure 1, the force aid system for braking of this utility model embodiment also includes: vacuum tank 600.Wherein, vacuum tank 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 tank 600 and vacuum booster 200.
Alternatively, in an embodiment of the present utility model, controller 400 can be entire car controller.
In a specific embodiment of the present utility model, as it is shown in figure 1, vacuum pressure sensor 300 is disposed on vacuum booster 200, vacuum booster 200 can provide brake boost demand for driver.Controller 400 can pass through A/D interface and gather vacuum pressure sensor 300 voltage signal, 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 barometric 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 to enable.Wherein, the electric current driving vacuum pump 100 can be produced by the driving chip that controller 400 is internal special.Two check valves (in figure check valve a and check valve b) extracting vacuum tank 600 and the air within vacuum booster 200 can be passed through, to provide vacuum to ensure when vacuum pump 100 works.Vacuum tank 600 can provide vacuum deposit for whole force aid system for braking, and especially when vacuum pump 100 does not work, the vacuum in vacuum tank 600 can provide brake boost demand for driver.It addition, controller 400 can judge and respond the fault (can be described in detail below) of vacuum boost system according to system mode, to ensure traffic safety.
In embodiment of the present utility model, hardware cost can be reduced by Integrated design scheme.Work owing to directly being controlled vacuum pump 100 by entire car controller, therefore eliminate special controller for vacuum pump, reduce hardware purchase cost；Second, for realizing driving the big electric current of 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 detection (fault detect is completed) automatically driving channel failure by driving chip, eliminate vacuum pump and drive other auxiliary circuit of path fault detection, such 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 effectiveness gathering vacuum-pressure signal, rather than on the vacuum tank of general pure electric automobile, (as in vacuum tank, vacuum is enough, vacuum pump is not up to starting threshold values, but causes that in vacuum booster 200, vacuum is very low owing to check valve blocks to avoid the potential safety hazard owing to the reasons such as check valve blocking cause, cause providing brake boost, in turn result in brake safe hidden danger)；4th, namely the start and stop vacuum pressure threshold values achieving vacuum pump 100 by introducing barometric pressure sensor 401 starts threshold values and the dynamic adjustment closing threshold values, enables car braking force aid system at each height above sea level region normal operation.
Further, in an embodiment of the present utility model, the force aid system for braking of this utility model embodiment also includes: memory module 500 (not being specifically identified in figure).Memory module 500 is used for prestoring the startup threshold values of force value and vacuum pump and closing threshold values relation table, and controller 400 determines the startup threshold values of vacuum pump 100 with cut out threshold values relation table and atmospheric pressure value according to the threshold values that starts of preset pressure value and vacuum pump and cuts out threshold values.
Wherein, in an embodiment of the present utility model, receive startup threshold values and the closedown threshold values relation table of force value and the vacuum pump inputted, or, startup threshold values and the closedown threshold values relation table of force value and vacuum pump is downloaded from server end.
Can be the startup threshold values according to force value and vacuum pump and closedown threshold values relation table it is understood that above-mentioned according to certain control logic.Wherein, the startup threshold values of force value and vacuum pump can be write by technical staff when dispatching from the factory with closing threshold values relation table or download from server end, it is possible to be updated at any time.
It addition, force value and vacuum pump start the force aid system for braking internal pressure that the vacuum pressure value that threshold values and the force value closed in threshold values relation table can be the vacuum booster 200 detected according to atmospheric pressure value and vacuum pressure sensor 300 obtains.
Further, the control method of the force aid system for braking of this utility model embodiment includes vacuum pump control strategy and failure strategy two aspect, introduces in detail below.
Fig. 2 is that the barometric pressure sensor according to one embodiment of this utility model does not break down the control flow chart of the vacuum pump under state.
As in figure 2 it is shown, under barometric pressure sensor does not break down state, control strategy comprises the following steps:
S201, vehicle powers on.
S202, it is judged that whether force aid system for braking internal pressure is less than V_on, if it is, perform step S203；If it is not, then terminate.
S203, it is judged that whether vacuum pump 100 enables, if it is, perform step S204；If it is not, then perform step S205.
S204, accumulative vacuum pump 100 working time.
S205, starts vacuum pump 100 timing.
Specifically, vehicle first determines whether after powering on that whether force aid system for braking internal pressure is lower than starting threshold values V_on, if lower than starting threshold values V_on, judging whether vacuum pump 100 enables, if enabling, continuing to keep enabled state, if being not enabled on, enabling vacuum pump 100 cumulative operation time.Wherein, starting threshold values value V_on is fixed value, and unit is Patm.The force value that definition is collected by the vacuum pressure sensor 300 of vacuum booster 200 is V_vac, 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, it is judged that whether force aid system for braking internal pressure is more than V_off, if it is, terminate；If it is not, then continue executing with step S206.
S207, terminates.
Further, after vacuum pump 100 enables, it is judged that whether force aid system for braking internal pressure reaches to close threshold values V_off, if reaching to close threshold values V_off, closing vacuum pump and enabling.
But, above-mentioned control strategy achieves the startup threshold values of vacuum pump 100 along with the change tread adjustment of height above sea level, and then can ensure that the normal operation of force aid system for braking with closing threshold values.Current most pure electric automobile (adopts electric vacuum pump as force aid system for braking vacuum source) and all adopts single sensor solution, namely the control of vacuum pump is carried out merely with the vacuum pressure sensor information within force aid system for braking, it is generally adopted fixing open and close threshold values, open during such as pressure lower than 50kp, closing (taking the absolute value of vacuum pressure) during higher than 70kp, above threshold values is only applicable to low altitude area.Assume that vacuum pump evacuation ability is 90%, it is then that the vacuum pressure in booster is evacuated to 90kp by the most high energy of 100m area (corresponding atmospheric pressure value be about 100kp) at height above sea level, now vacuum pump does not occur at vacuum boost system, under the premise of the faults such as leakage, vacuum pressure to be evacuated to 70kp, 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 vacuum in vacuum booster, if closing threshold values is still 70kp, vacuum pump will not reach the condition of closedown, cause continuous firing, and then produce potential safety hazard (as service life of vacuum pump shortens even overheated burning).
But, the force aid system for braking of this utility model embodiment is absent from problem above, make V_on=0.5Patm, V_off=0.7Patm, it is then 100m area (corresponding atmospheric pressure value be about 100kp) at height above sea level, according to current control strategy, when pressure within vacuum booster 200 is lower than 50kp (absolute value), vacuum pump 100 enables work, quits work when pressure is higher than 70kp (absolute value)；And arrived the area (corresponding atmospheric pressure value is about 73.7kp) of height above sea level 2500m, when pressure within vacuum booster 200 is lower than 36.85kp (absolute value), vacuum pump 100 enables work, and when pressure is higher than 51.59kp (absolute value), vacuum pump 100 quits work.
Control strategy shown in Fig. 2 achieves the dynamic adjustment of vacuum pressure threshold values (| V_vac |) in the on off control of vacuum pump 100 by introducing barometric pressure sensor 401, enables the force aid system for braking of vehicle at full height above sea level region normal operation.
Further, in an embodiment of the present utility model, controller 400 also includes: timing module 402 (not being specifically identified in figure).Timing module 402 is used for recording vacuum pump 100 stream time, and controller 400 controls vacuum pump 100 after vacuum pump 100 stream time reaches the setting time and cuts out.
Fig. 3 is the control flow chart of the vacuum pump under the barometric pressure sensor malfunction according to one embodiment of this utility model.
It is to say, as it is shown on figure 3, under barometric pressure sensor malfunction, control strategy comprises the following steps:
S301, vehicle powers on.
S302, it is judged that whether vacuum pressure is less than Ve_on, if it is, perform step S303；If it is not, then terminate.
After vehicle powers on, first determine whether that vacuum booster 200 internal pressure that collected by vacuum pressure sensor 300 and vacuum pressure (taking absolute value) are whether lower than the startup threshold values Ve_on of vacuum pump 100
S303, it is judged that whether vacuum pump 100 enables, if it is, perform step S304；If it is not, then perform step S305.
S304, accumulative vacuum pump 100 working time.
S305, starts vacuum pump 100 timing.
It is to say, when vacuum pressure is lower than Ve_on, determine whether whether vacuum pump 100 enables, if being not enabled on, starting vacuum pump 100 timing, if vacuum pump 100 enables, continuing to keep enabled state, simultaneously the record vacuum pump working time
S306, it is judged that whether vacuum pressure is more than Ve_off, if it is, perform step S307；If it is not, then perform step S309.
S307, it is judged that whether vacuum pump 100 working time is more than setting time T, if it is, execution step S308；If it is not, then perform step S306.
S308, it is judged that whether vacuum pressure is more than Ve_on, if it is, perform step S309, if it is not, then perform step S306.
It is to say, when vacuum pressure is higher than Ve_off, close vacuum pump 100.Wherein, if vacuum pressure is not up to Ve_off, then judge that whether this working time of vacuum pump 100 is more than setting time T, if more than setting time T, continuing to judge that whether vacuum pressure is more than Ve_on, if satisfying condition, closes vacuum pump 100.The setting time can be configured according to practical application.
S309, terminates.
That is, after occurring barometric pressure sensor 401 to break down, control method shown in Fig. 2 will be no longer applicable, reason is the exact value that now will not be able to obtain external atmospheric pressure, cause that above control logic can not effectively perform, in this case vacuum pump is controlled by employing single-sensor logic, namely detects ethic information merely with vacuum pressure sensor 300 and control the duty of vacuum pump 100.
Specifically, after barometric pressure sensor 401 breaks down, adopt the vacuum pressure value that vacuum pressure sensor 300 detects that the duty of vacuum pump 100 is controlled, wherein, the startup threshold values of vacuum pump 100 and closedown threshold values respectively Ve_on and Ve_off, consider likely vacuum to be evacuated to Ve_off when vehicle is in highlands then vacuum pump 100, the single working time strategy of vacuum pump 100 is introduced for this problem, when vacuum pump 100 continuous firing exceedes setting time T, then utilize Ve_on as the closedown threshold values of vacuum pump 100, namely vacuum pump 100 is closed when the pressure within vacuum booster 200 is higher than this value.Control strategy shown in Fig. 3 ensure that the vehicle effective work at a range of high altitude localities force aid system for braking, it is achieved the normally-open and closedown of vacuum pump, it is prevented that it overheated even causes damage owing to working long hours.
In the above-described embodiments; the control strategy of vacuum pump 100 is overall inseparable as one that realizes brake boost function with the failure strategy of brakes; control strategy achieves the base control function of force aid system for braking, and perfect failure strategy then can farthest protect the safety of vehicle and driver and crew when breaking down.Therefore, the failure strategy of this utility model embodiment specifically can be such that
1. rough vacuum fault
Fault triggering condition: speed and continues to trigger this fault (barometric pressure sensor does not break down) after 2 seconds lower than Plow more than pressure in V and force aid system for braking；Or speed more than the vacuum pressure within V and brake booster lower than PelowAnd trigger this fault (barometric pressure sensor breaks down) after continuing 2 seconds.
Fault recovery condition: speed less than or equal to pressure in V or force aid system for braking higher than Phigh persistently this fault recovery (barometric pressure sensor does not break down) after 2 seconds；Or speed less than or equal to pressure in V or brake booster higher than Pehigh persistently this fault recovery (barometric pressure sensor breaks down) after 2 seconds.
Troubleshooting 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 brakes vacuum is relatively low, and additionally this failure strategy gives two set threshold values, is respectively used to that barometric pressure sensor is normal and under two states of fault, fault triggers and the judgement of the condition of recovery.
2. vacuum pressure sensor fault
Fault triggering condition: speed does not trigger this fault at valid interval and after continuing 2 seconds more than V and the vacuum pressure sensor voltage that collects.
Fault recovery condition: car load re-powers.
Troubleshooting mode: light braking system faults lamp, the short ring of alarm sound, continue to enable vacuum pump.
The introducing of this failure strategy ensure that traffic safety when vacuum pressure sensor lost efficacy, and owing to cannot obtain the vacuum in booster, therefore continues to enable vacuum pump, to ensure the brake boost demand of driver.
3. vacuum pump drives path fault
Fault triggering condition: detect that vacuum pump flash triggers this fault after driving passage to break down (being detected this fault by the flash driving chip driving vacuum pump in entire car controller) and continuing 2 seconds.
Fault recovery condition: car load re-powers.
Troubleshooting 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: speed is in enabled state more than V, vacuum pump and when driver does not step on brake pedal, if pressure rises lower than P in 2 secondsminThen trigger this fault (barometric pressure sensor does not break down)；Or when speed is in enabled state more than V, vacuum pump and driver does not step on brake pedal, if pressure rises lower than Pe in 2 secondsminThen trigger this fault (barometric pressure sensor breaks down).
Fault recovery condition: car load re-powers.
Troubleshooting mode: light braking system faults lamp, the short ring of alarm sound.
The introducing of this failure strategy ensure that traffic safety when force aid system for braking is revealed, and additionally this failure strategy gives two set threshold values, is respectively used to that barometric pressure sensor is normal and the judgement of fault triggering condition under two states of fault.
5. barometric pressure sensor fault
Fault triggering condition: speed does not trigger this fault at valid interval and after continuing 2 seconds more than V and the barometric pressure sensor voltage that collects.
Fault recovery condition: car load re-powers.
Troubleshooting mode: light braking system faults lamp, utilizes vacuum pressure sensor information that vacuum pump is controlled.
Driver is served warning function by the introducing of this failure strategy, owing to simple barometric pressure sensor fault does not affect driving, therefore only pass through to light trouble light driver is warned, but not remind driver 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.
Fault recovery condition: car load re-powers.
Troubleshooting 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 this utility model embodiment can adopt Integrated design scheme, relies on the powerful data-handling capacity of entire car controller and interface resource, it is achieved that the integrating control to vacuum pump, eliminates special controller, reduce hardware cost；Additionally, for producing to drive the larger current of 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 driving channel failure, eliminate detection and drive other auxiliary circuit of path fault, such as current detection circuit etc., reduce cost, improve the reliability of detection simultaneously；3rd, adopt dual sensor scheme, it is achieved that force aid system for braking internal pressure and the double check of outside atmospheric pressure, coordinate corresponding control strategy to ensure that this system normal operation in full altitude height areas；In addition, vacuum pressure sensor is arranged on vacuum booster by this force aid system for braking, rather than on the vacuum tank of general pure electric automobile, ensure that and gather the directly effective of vacuum-pressure signal, (in vacuum tank, vacuum is enough to avoid the pressure detecting hidden danger that causes due to the reason such as check valve blocking in system, but owing to check valve blocking causes that in vacuum booster, vacuum is very low, now will have potential safety hazard).Therefore, the force aid system for braking that this utility model provides reduces cost under ensureing the premise of systematic function and reliability, is highly suitable for economical pure electric automobile.
Further, (start and stop threshold values V_on and the V_off of control strategy intermediate pump is fixed value according to the vacuum pressure threshold values of residing height above sea level self-adaptative adjustment vacuum pump start and stop to achieve vehicle by introducing atmospheric pressure information, for V_on, vacuum pump is then enabled when ratio | V_vac |/V_abs of the vacuum pressure within force aid system for braking and atmospheric pressure is less than V_on, along with the rising V_abs of height above sea level will decline, owing to threshold values V_on fixes, therefore V_vac follows decline, thus achieve Automatic adjusument), to ensure force aid system for braking normal operation, eliminating electric vacuum pump that the Method for Single Sensor System only configuring vacuum pressure sensor the causes single working time under altitude environment due to fixing threshold values extends and continues to enable phenomenon, the life-span of vacuum pump is served protective effect, reduce the vacuum pump caused 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 malfunction, this utility model embodiment also has the force aid system for braking failure strategy of integral framework, this failure strategy defines rough vacuum fault, vacuum pressure sensor fault, vacuum pump drives path fault, force aid system for braking leakage failure and barometric pressure sensor fault, above failure strategy matches with vacuum pump control strategy, when a failure occurs it by instrument warning lamp, alarm tone prompting prompting driver, and the potential danger grade according to fault determines whether this fault can be recovered, when danger classes reaches to a certain degree, the safety of vehicle and driver and crew is ensured by vehicle being carried out the mode of speed limit.The force aid system for braking failure strategy that this utility model provides can ensure the safety of vehicle and driver and crew preferably.
Additionally, when there is barometric pressure sensor fault, vacuum pump is controlled by the information utilizing booster internal vacuum pressure sensor, owing to only having vacuum pressure sensor information, therefore altitude acclimatization sex chromosome mosaicism is inevitably produced, namely at highlands vacuum pump, vacuum likely can not be evacuated to vacuum pump and close threshold values Ve_off, in control strategy, vacuum pump single working time strategy is introduced for this, when vacuum pump continuous firing exceedes certain time, then utilize vacuum pump to open threshold values Ve_on and close threshold values as vacuum pump, namely vacuum pump is closed when the pressure within booster is higher than this value, the method can eliminate the altitude environment impact on system to greatest extent under ensureing the premise that force aid system for braking provides effective power-assisted, it is capable of the normally-open of vacuum pump and closedown, prevent it from overheated even causing damage owing to working long hours.
Force aid system for braking according to the vehicle that this utility model embodiment proposes, by arranging and the vacuum pressure sensor detection vacuum pressure value on vacuum booster, avoid the potential safety hazard owing to the reasons such as check valve blocking cause, and by arranging and the barometric pressure sensor detection atmospheric pressure value in controller, startup threshold values and the closedown threshold values of vacuum pump is determined thereby through atmospheric pressure value, under ensureing the premise of vehicle performance and reliability, improve the adaptability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce cost, improve the economy of vehicle.Additionally, the system of this utility model embodiment ensure that force aid system for braking normal operation, eliminating electric vacuum pump that the Method for Single Sensor System only configuring vacuum pressure sensor the causes single working time under altitude environment due to fixing threshold values extends and continues to enable phenomenon, the life-span of vacuum pump is served protective effect, reduce the vacuum pump caused 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 eliminate the altitude environment impact on system to greatest extent under ensureing the premise that force aid system for braking provides effective power-assisted, it is capable of the normally-open of vacuum pump and closedown, prevent it from overheated even causing damage owing to working long hours.
Additionally, embodiment of the present utility model also proposed a kind of vehicle, this vehicle includes the force aid system for braking of above-mentioned vehicle.This vehicle can pass through to arrange and the vacuum pressure sensor detection vacuum pressure value on vacuum booster, avoid the potential safety hazard owing to the reasons such as check valve blocking cause, and by arranging and the barometric pressure sensor detection atmospheric pressure value in controller, startup threshold values and the closedown threshold values of vacuum pump is determined thereby through atmospheric pressure value, under ensureing the premise of vehicle performance and reliability, improve the adaptability of vehicle, meet the user demand of each operating mode better, and startup and the closedown of vacuum pump is controlled by controller, reduce cost, improve the economy of vehicle.Additionally, this vehicle can also ensure that force aid system for braking normal operation, eliminating electric vacuum pump that the Method for Single Sensor System only configuring vacuum pressure sensor the causes single working time under altitude environment due to fixing threshold values extends and continues to enable phenomenon, the life-span of vacuum pump is served protective effect, reduce the vacuum pump caused 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 eliminate the altitude environment impact on system to greatest extent under ensureing the premise that force aid system for braking provides effective power-assisted, it is capable of the normally-open of vacuum pump and closedown, prevent it from overheated even causing damage owing to working long hours.
In description of the present utility model, 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 ", " clockwise ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.
Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, for instance two, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in this utility model as the case may be.
In this utility model, 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 mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment of the present utility model or example.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.
Although above it has been shown and described that embodiment of the present utility model, it is understandable that, above-described embodiment is illustrative of, it is not intended that to restriction of the present utility model, above-described embodiment can be changed in scope of the present utility model, revises, replace and modification by those of ordinary skill in the art.
Claims (8)
1. the force aid system for braking of a vehicle, it is characterised in that including:
Vacuum pump；
The vacuum booster being connected with brake pedal and described vacuum pump；
The vacuum pressure sensor being connected with described vacuum booster, for detecting the vacuum pressure value of described vacuum booster；And
Controller, described controller is connected with described vacuum pump and described vacuum pressure sensor respectively, described controller is provided with barometric pressure sensor, to detect the atmospheric pressure value of current environment, the vacuum pressure value of the described vacuum booster that described controller detects according to described atmospheric pressure value and described vacuum pressure sensor is determined the startup threshold values of vacuum pump and closes threshold values, and starting threshold values and closing startup and the closedown of the threshold values described vacuum pump of control according to described vacuum pump.
2. the force aid system for braking of vehicle according to claim 1, it is characterised in that described controller also includes:
For recording the timing module of described vacuum pump stream time, described controller controls described vacuum pump after described vacuum pump stream time reaches the setting time and cuts out.
3. the force aid system for braking of vehicle according to claim 1, it is characterised in that also include:
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 with cut out threshold values relation table and described atmospheric pressure value according to the threshold values that starts of described preset pressure value and vacuum pump and cuts out threshold values.
4. the force aid system for braking of vehicle according to claim 3, it is characterized in that, receive startup threshold values and the closedown threshold values relation table of described force value and the vacuum pump inputted, or, startup threshold values and the closedown threshold values relation table of described force value and vacuum pump is downloaded from server end.
5. the force aid system for braking of vehicle according to claim 1, it is characterised in that be 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, it is characterised in that also include:
The vacuum tank being connected with described vacuum booster, is provided with at least one check valve between described vacuum tank and described vacuum booster.
7. the force aid system for braking of vehicle according to claim 1, it is characterised in that described controller is entire car controller.
8. a vehicle, it is characterised in that including: the force aid system for braking of the vehicle as described in any one of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521130008.6U CN205344865U (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521130008.6U CN205344865U (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
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| Publication Number | Publication Date |
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| CN205344865U true CN205344865U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521130008.6U Expired - Fee Related CN205344865U (en) | 2015-12-30 | 2015-12-30 | Brake boosting system of vehicle and vehicle with same |
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| CN (1) | CN205344865U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Brake boosting system of vehicle and vehicle with same |
| CN107031457A (en) * | 2017-03-15 | 2017-08-11 | 北京长城华冠汽车科技股份有限公司 | The vacuum system fault detection method and system of electric automobile |
| CN107458364A (en) * | 2017-07-20 | 2017-12-12 | 北京新能源汽车股份有限公司 | Brake boosting system control method and device |
| CN109878485A (en) * | 2019-04-03 | 2019-06-14 | 厦门金龙联合汽车工业有限公司 | Electric car service brake force aid system and its control strategy and method for diagnosing faults |
-
2015
- 2015-12-30 CN CN201521130008.6U patent/CN205344865U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Brake boosting system of vehicle and vehicle with same |
| CN107031457A (en) * | 2017-03-15 | 2017-08-11 | 北京长城华冠汽车科技股份有限公司 | The vacuum system fault detection method and system of electric automobile |
| CN107458364A (en) * | 2017-07-20 | 2017-12-12 | 北京新能源汽车股份有限公司 | Brake boosting system control method and device |
| CN107458364B (en) * | 2017-07-20 | 2019-11-22 | 北京新能源汽车股份有限公司 | Force aid system for braking control method and device |
| CN109878485A (en) * | 2019-04-03 | 2019-06-14 | 厦门金龙联合汽车工业有限公司 | Electric car service brake force aid system and its control strategy and method for diagnosing faults |
| CN109878485B (en) * | 2019-04-03 | 2023-11-28 | 厦门金龙联合汽车工业有限公司 | Electric automobile service brake booster system, control strategy and fault diagnosis method thereof |
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