CN104842988A - Method and system for controlling switching-on threshold value and switching-off threshold value of brake vacuum pump - Google Patents
Method and system for controlling switching-on threshold value and switching-off threshold value of brake vacuum pump Download PDFInfo
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- CN104842988A CN104842988A CN201410222866.7A CN201410222866A CN104842988A CN 104842988 A CN104842988 A CN 104842988A CN 201410222866 A CN201410222866 A CN 201410222866A CN 104842988 A CN104842988 A CN 104842988A
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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
- B60T13/66—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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- Valves And Accessory Devices For Braking Systems (AREA)
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Abstract
The invention provides a method and system for controlling the switching-on threshold value and the switching-off threshold value of a brake vacuum pump. The method comprises an information acquiring step and a threshold value setting step. According to the information acquiring step, at least the current vehicle speed information and brake information are acquired. According to the threshold setting step, the switching-on threshold value and the switching-off threshold value of the vacuum pump are set respectively at least according to the speed of a vehicle and the magnitude of brake signals through the current vehicle speed information and the brake information, and the working time of the vacuum pump is reduced under the premise that the braking safety is guaranteed. According to the method and system, the switching-on threshold value and the switching-off threshold value of the vacuum pump can be set according to the current vehicle speed information and the brake information, so that the various working conditions of the vehicle in the traveling process are fully considered; under the premise that the brake safety is absolutely guaranteed, the working time of the vacuum pump can be reduced to the greatest extent, the probability of breakdowns due to long-time working of the vacuum pump is lowered, and the service life of the vacuum pump is effectively prolonged.
Description
Technical field
The present invention relates to a kind of vacuum pump control method and system, specifically a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value.
Background technology
Along with the development of automobile industry, and sustainable development is to the requirement of the energy, environment, and new-energy automobile comes into the popular visual field gradually, and electric vacuum pump is also widely used in the brake system of hybrid power and pure electric automobile.In traditional vacuum method for controlling pump, under the condition of electric power abundance, vacuum pump is in running order for a long time, easily causes electric vacuum pump to break down, affects brake safe, meanwhile, also can cause some unnecessary degradations of energy.Therefore, on traditional control basis, add the detection control of vacuum pressure, namely when vacuum pressure meets the condition of vacuum pump unlatching or closedown, then open or close vacuum pump, decreasing vacuum pump work-hours, avoid unnecessary energy consumption.At present, the condition criterion mode opened and closed about vacuum pump has following two kinds:
The first is by brake system characteristic and Experimental Calibration, sets the vacuum pressure threshold value that one group of vacuum pump opens and closes, when vacuum pressure is lower than the lower threshold set, and vacuum air pump inoperative; When vacuum pressure is higher than the upper limit threshold set, vacuum pump is opened; When vacuum pressure is between bound threshold value, vacuum pump keeps the action of previous state.Because the method only sets one group of threshold value, do not consider the vehicle-state of actual driving conditions, at speed of a motor vehicle height with when having braking intention, if vacuum pump fails to open in time, the vacuum degree deficiency that likely can provide because of brake system, cause braking difficulty and accidents caused; And when the low speed of a motor vehicle, also likely can cause the unlatching that vacuum pump is unnecessary, thus reduce the service life of vacuum pump.
The second, on the basis of brake system characteristic, according to current vehicle speed scope, sets different vacuum pressure threshold values, when speed of a motor vehicle height, the threshold value of setting when the vacuum pressure threshold value of setting is low lower than the speed of a motor vehicle, like this, when making speed of a motor vehicle height, vacuum pump is more easily opened, and more can ensure safety traffic.The second is on the basis of first method, although add vehicle speed signal, but the different vacuum pressure threshold values that this method is only considered vacuum pressure and set under the different speed of a motor vehicle, do not consider the impact that speed-slackening signal produces vacuum pump operation threshold, also likely cause vacuum pump to open and close not in time, harmful effect is caused to brake system safety and vacuum pump serviceability.
Also a kind of control setup for electrovacuum pump and the method for manipulating electrovacuum pump is disclosed at Chinese patent literature CN103562031A, described control setup has: measuring means (12a), and described measuring means is designed for and detects the operational factor depending on the run duration of this electrovacuum pump of described electrovacuum pump and the adjustable parameter for described electrovacuum pump; Switching mechanism (12d), described switching mechanism is designed for connects or cuts off described vacuum pump according to described adjustable parameter with comparing of at least one rated value; And adjusting mechanism (12c), described adjusting mechanism is designed at least one rated value changing described adjustable parameter according to described operational factor.This patent can adjust the operational factor of vacuum pump by the accumulated running time of vacuum pump self, thus can control vacuum pump more accurately and start and close.But the method in the program is when adjusting the operational factor of vacuum pump, only considered the working condition of vacuum pump self, as continuous working period or temperature, do not consider the running state of whole vehicle, under vehicle is in different running statees, even if the working condition of vacuum pump self does not change, now the keying of vacuum pump is required it is also different, the open/close states of the vacuum pump therefore in the program is only limited to the impact of oneself state, can not meet vehicle requirement to vacuum pump open and shut characteristic when being under different operating mode.
Summary of the invention
For this reason, technical matters to be solved by this invention is to overcome in prior art and can not adjusts according to vehicle working condition the problem that vacuum pump opens threshold value and closedown threshold value, provides a kind of brake vacuum pump to open threshold value and closes control method and the system of threshold value.
For solving the problems of the technologies described above, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out the control method of threshold value, comprises the steps:
Information acquiring step: at least obtain current vehicle speed information and braking information;
Threshold value setting procedure: by current speed information and braking information, at least the unlatching threshold value of vacuum pump be set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and close threshold value, ensureing brake safe and the work-hours of minimizing vacuum pump.
Brake vacuum pump opens threshold value and cuts out a control method for threshold value, and described threshold value setting procedure comprises:
When the speed of a motor vehicle is less than low velocity threshold, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
And/or when the speed of a motor vehicle is less than low velocity threshold, have the closedown threshold value of vacuum pump during speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
Brake vacuum pump opens threshold value and cuts out a control method for threshold value, and described threshold value setting procedure comprises:
When the speed of a motor vehicle is greater than High Speed Threshold, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
And/or when the speed of a motor vehicle is greater than High Speed Threshold, have the closedown threshold value of vacuum pump during speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
Brake vacuum pump opens threshold value and cuts out a control method for threshold value, and described threshold value setting procedure comprises:
When the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment.
Brake vacuum pump opens threshold value and cuts out a control method for threshold value, and described threshold value setting procedure comprises:
When the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and close threshold value and be greater than the unlatching threshold value of the vacuum pump when speed of a motor vehicle is greater than High Speed Threshold respectively and close threshold value.
Brake vacuum pump opens threshold value and cuts out a control method for threshold value, and the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
Brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, also comprises the step revised described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure.
Brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, according to the step that current atmospheric pressure is revised described vacuum pump unlatching threshold value and closedown threshold value, comprises further:
Gather current outside barometric pressure;
Described current outside barometric pressure and standard atmosphere are divided by and obtain barometric pressure coefficient of correction;
Barometric pressure coefficient of correction and the described vacuum pump obtained are opened threshold value and described vacuum pump to close the threshold value value obtained that is multiplied and open threshold value as final vacuum pump and close threshold value.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, comprising:
Information acquisition device, at least obtaining current vehicle speed information and braking information;
Threshold value setting device, for by current speed information and braking information, at least the unlatching threshold value of vacuum pump be set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and close threshold value, ensureing brake safe and the work-hours of minimizing vacuum pump.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, and described threshold value setting device comprises:
First threshold setup unit, described first threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal;
And/or Second Threshold setup unit, described Second Threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the closedown threshold value of speed-slackening signal vacuum pump in season to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, and described threshold value setting device comprises:
3rd threshold setting unit, described 3rd threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
And/or the 4th threshold setting unit, described 4th threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the closedown threshold value of the seasonal vacuum pump of speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
A kind of brake vacuum pump opens threshold value and cuts out the control system of threshold value, described threshold value setting device comprises the 5th threshold setting unit, described 5th threshold setting unit is used for when the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, arranges the opening and closing threshold value of vacuum pump according to the speed of a motor vehicle state of previous moment.
A kind of brake vacuum pump opens threshold value and cuts out the control system of threshold value, described threshold value setting device comprises the 6th threshold setting unit, described 6th threshold setting unit is used for when the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and closes unlatching threshold value and the closedown threshold value of vacuum pump when threshold value is greater than High Speed Threshold higher than the speed of a motor vehicle respectively.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, and the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, and system also comprises barometric pressure correcting device, described barometric pressure correcting device, revises described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure.
Brake vacuum pump opens threshold value and cuts out a control system for threshold value, and described barometric pressure correcting device comprises further:
Barometric pressure collecting unit, for gathering current outside barometric pressure;
Coefficient of correction calculating unit, obtains barometric pressure coefficient of correction for described current outside barometric pressure and standard atmosphere being divided by;
Data processing unit, closes the be multiplied value that obtains of threshold value and opens threshold value as final vacuum pump for barometric pressure coefficient of correction and the described vacuum pump obtained being opened threshold value and described vacuum pump and close threshold value.
Technique scheme of the present invention has the following advantages compared to existing technology:
1, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, comprises the steps: information acquiring step, at least obtains current vehicle speed information and braking information; Threshold value setting procedure, according to current speed information and braking information, divide by current speed information and braking information, at least the unlatching threshold value of vacuum pump is set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and closes threshold value, under the prerequisite ensureing brake safe, reduce the work-hours of vacuum pump.The present invention arranges the unlatching threshold value of vacuum pump according to current speed information and braking information and closes threshold value, consider vehicle various working in the process of moving fully, under the prerequisite of absolute guarantee's brake safe, the work-hours of vacuum pump can be reduced to greatest extent, reduce the probability that vacuum pump breaks down owing to working long hours, effectively extend the service life of vacuum pump.
2, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, when the vehicle is running, no matter be at high-speed cruising or low cruise, when there being speed-slackening signal, the unlatching threshold value of vacuum pump is made to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is greater than the closedown threshold value of vacuum pump when not having speed-slackening signal, when there being speed-slackening signal, the vacuum pressure value now detected is the vacuum pressure value after stepping on brake pedal, chaufeur steps on brake pedal, if there is not the situation of trampling slipper continuously, and vacuum pump is not also opened, illustrate that the degree of vacuum that now vacuum pump provides is enough, therefore under operating mode at this moment, the unlatching threshold value of vacuum pump is set to the unlatching threshold value being greater than vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is set to the closedown threshold value being greater than vacuum pump when not having speed-slackening signal, vacuum pump can be made comparatively to be not easy to open, comparatively easily close.And, due to when there is no speed-slackening signal, do not know whether chaufeur now has braking intention, therefore when there is no speed-slackening signal, what the unlatching threshold value of vacuum pump and closedown threshold value are arranged is less, when chaufeur emergency braking, can change the mode of operation of vacuum pump in time, effectively can realize snap catch, thus ensure that vehicle operating safety.
3, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, when the speed of a motor vehicle is less than low velocity threshold, make the unlatching threshold value of vacuum pump and close threshold value and be greater than the speed of a motor vehicle respectively higher than the unlatching threshold value of vacuum pump during High Speed Threshold and closedown threshold value, that is vehicle is when low speed driving, and the opening and closing threshold value of vacuum pump is greater than threshold value when vehicle high-speed runs respectively.When vehicle low cruise, if there is braking intention, chaufeur is by stepping on brake pedal, be easier to safety arrestment, it is higher that the vacuum pressure threshold value that therefore vacuum pump can be opened and closed is arranged, and is namely not easy to open, easily closes, the period of service of vacuum pump can be effectively reduced, thus reach the object reducing vacuum pump failure.When vehicle is in high speed, if there is braking intention, chaufeur needs larger power to brake by trampling slipper, also larger brake boost is needed to realize braking, the braking force that chaufeur needs is higher or suddenly touch on the brake, what therefore the opening and closing threshold value of vacuum pump arranged is lower, namely easily opens, and is not easy to close.Effectively can strengthen the deceleration and stopping performance of vehicle, avoid the generation of car accident.
4, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, when the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment, effectively can avoid opening because the vacuum pump caused by car speed shake opens by mistake or closing by mistake, enhance the service life of vacuum pump.
5, the present invention is that a kind of brake vacuum pump opens threshold value and cuts out control method and the system of threshold value, also comprise the step of barometric pressure correction: calculate barometric pressure coefficient of correction, and described barometric pressure coefficient of correction and the described vacuum pump obtained are opened threshold value and described vacuum pump and close the threshold value value obtained that is multiplied and open threshold value as final vacuum pump and close threshold value, unlatching and the closedown of vacuum pump can be adjusted according to current atmospheric pressure, further enhancing the performance of motor vehicle braking system.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the diagram of circuit of one embodiment of the present of invention;
Fig. 2 is the constructional drawing of one embodiment of the present of invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Embodiment 1
The present invention is that a kind of brake vacuum pump opens threshold value and cuts out the control method of threshold value, comprises the steps:
Information acquiring step: obtain current vehicle speed information and braking information.
Threshold value setting procedure: by current speed information and braking information, the unlatching threshold value of vacuum pump is set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and closes threshold value, under the prerequisite ensureing brake safe, reduce the work-hours of vacuum pump.
As the embodiment that other can be replaced, except above-mentioned speed information and braking information, can also in conjunction with current running conditions of vehicle as the parameter such as condition of road surface, vehicle performance arranges threshold value, when the unlatching threshold value of this vacuum pump being set by these values and closing threshold value, ensure that its scope is reasonable, reach safety arrestment and reduce the energy-conservation object of the work-hours of vacuum pump.Under the guidance of the present invention's design, those skilled in the art can complete the setting of above-mentioned threshold value in conjunction with the knowledge of this area.
The present invention arranges the unlatching threshold value of vacuum pump according to current speed information and braking information and closes threshold value, consider vehicle various working in the process of moving fully, under the prerequisite of absolute guarantee's brake safe, the work-hours of vacuum pump can be reduced to greatest extent, reduce the probability that vacuum pump breaks down owing to working long hours, effectively extend the service life of vacuum pump.
Described threshold value setting procedure comprises the steps: further
When the speed of a motor vehicle is less than low velocity threshold, namely during low cruise, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
When the speed of a motor vehicle is less than low velocity threshold, namely during low cruise, the closedown threshold value of vacuum pump during speed-slackening signal is had to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
When the speed of a motor vehicle is greater than High Speed Threshold, namely during high-speed cruising, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
When the speed of a motor vehicle is greater than High Speed Threshold, namely during high-speed cruising, the closedown threshold value of vacuum pump during speed-slackening signal is had to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
When the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment.
When the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and close threshold value and be greater than the unlatching threshold value of the vacuum pump when speed of a motor vehicle is greater than High Speed Threshold respectively and close threshold value.
As one of the present embodiment concrete embodiment, as shown in Figure 1, described threshold value setting procedure comprises the steps: further
S1: judge whether the speed of a motor vehicle is less than a, if be less than a, then enter step S2, otherwise enter step S3.
S2: judge whether brake pedal is stepped on, if described brake pedal is stepped on, then opens threshold value and is set as that A1, vacuum pump are closed threshold value and be set as A2, otherwise described vacuum pump unlatching threshold value is set as that B1, vacuum pump are closed threshold value and be set as B2 by vacuum pump.
S3: judge whether the speed of a motor vehicle is greater than b, if be greater than b, then enter step S4, otherwise described vacuum pump opens threshold value and vacuum pump closes the numerical value that threshold value maintains previous state.
S4: judge whether brake pedal is stepped on, if described brake pedal is stepped on, then opens threshold value and is set as that C1, vacuum pump are closed threshold value and be set as C2, otherwise described vacuum pump unlatching threshold value is set as that D1, vacuum pump are closed threshold value and be set as D2 by vacuum pump.
Wherein, described low velocity threshold is a, described High Speed Threshold is b; When vehicle is in low cruise operating mode, the unlatching threshold value having vacuum pump during speed-slackening signal is A1, the unlatching threshold value of vacuum pump is B1 when not having speed-slackening signal, and the closedown threshold value having vacuum pump during speed-slackening signal is A2, the unlatching threshold value of vacuum pump is B2 when not having speed-slackening signal; When vehicle is in high-speed cruising operating mode, the unlatching threshold value having vacuum pump during speed-slackening signal is C1, the unlatching threshold value of vacuum pump is D1 when not having speed-slackening signal, and the closedown threshold value having vacuum pump during speed-slackening signal is C2, the unlatching threshold value of vacuum pump is D2 when not having speed-slackening signal.
When the speed of a motor vehicle is lower than a, if there is braking intention, chaufeur, by stepping on brake pedal, is easier to safety arrestment, and therefore, it is higher that the vacuum pressure threshold value that vacuum pump can be opened and closed is arranged, and is namely not easy to open, easily closes.When the speed of a motor vehicle is higher than b, now, if there is braking intention, the braking force that chaufeur needs is higher or suddenly step on braking, and therefore, it is lower that the vacuum pressure threshold value that vacuum pump opens and closes should be arranged, and namely easily opens, and is not easy to close.When there is no speed-slackening signal, now, not knowing whether chaufeur has the intention stepping on braking, in order to ensure safety, needing vacuum pump relative more easily unlatching, more difficulty to close, therefore, can the vacuum pressure threshold value that vacuum pump is opened be arranged slightly little.When there being speed-slackening signal, detect that vacuum pressure value is the force value after stepping on brake pedal this moment.Chaufeur steps on brake pedal, if there is not the situation stepping on braking continuously, and vacuum pump is not also opened, illustrate that the degree of vacuum that now vacuum pump provides is enough, therefore, under this operating mode, vacuum pressure is opened threshold value and can be set slightly larger than the threshold value not stepping on brake pedal setting, and vacuum pump can be made comparatively to be not easy to open, be easier to close.As long as those skilled in the art has understood object of the present invention herein, can the unlatching threshold value of above-mentioned vacuum pump be set according to the presence or absence of the height of present speed in conjunction with speed-slackening signal and close threshold value.
As a kind of embodiment of optimum, make A1 > B1 > C1 > D1, A2 > B2 > C2 > D2.
When the vehicle is running, no matter be at high-speed cruising or low cruise, when there being speed-slackening signal, the unlatching threshold value of vacuum pump is made to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is made to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal, when there being speed-slackening signal, the vacuum pressure value now detected is the vacuum pressure value after stepping on brake pedal, chaufeur steps on brake pedal, if there is not the situation of trampling slipper continuously, and vacuum pump is not also opened, illustrate that the degree of vacuum that now vacuum pump provides is enough, therefore under operating mode at this moment, the unlatching threshold value of vacuum pump is set to the unlatching threshold value being greater than vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is set to the closedown threshold value being greater than vacuum pump when not having speed-slackening signal, vacuum pump can be made comparatively to be not easy to open, comparatively easily close.And, due to when there is no speed-slackening signal, do not know whether chaufeur now has braking intention, therefore when there is no speed-slackening signal, what the unlatching threshold value of vacuum pump and closedown threshold value are arranged is less, when chaufeur emergency braking, can change the mode of operation of vacuum pump in time, effectively can realize snap catch, thus ensure that vehicle operating safety.
In addition, when the speed of a motor vehicle is less than low velocity threshold, make the unlatching threshold value of vacuum pump and close threshold value and be greater than the speed of a motor vehicle respectively higher than the unlatching threshold value of vacuum pump during High Speed Threshold and closedown threshold value, that is vehicle is when low speed driving, and the opening and closing threshold value of vacuum pump is greater than threshold value when vehicle high-speed runs respectively.When vehicle low cruise, if there is braking intention, chaufeur is by stepping on brake pedal, be easier to safety arrestment, it is higher that the vacuum pressure threshold value that therefore vacuum pump can be opened and closed is arranged, and is namely not easy to open, easily closes, the period of service of vacuum pump can be effectively reduced, thus reach the object reducing vacuum pump failure.When vehicle is in high speed, if there is braking intention, chaufeur needs larger power to brake by trampling slipper, also larger brake boost is needed to realize braking, the braking force that chaufeur needs is higher or suddenly touch on the brake, what therefore the opening and closing threshold value of vacuum pump arranged is lower, namely easily opens, and is not easy to close.Effectively can strengthen the deceleration and stopping performance of vehicle, avoid the generation of car accident.
The unlatching threshold value of vacuum pump or closedown threshold value generally refer to the force value of vacuum pump, and when unlatching threshold value is larger, vacuum pump is more not easily opened; When closedown threshold value is larger, vacuum pump is more easily closed.
When the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment, effectively can avoid opening because the vacuum pump caused by car speed shake opens by mistake or closing by mistake, enhance the service life of vacuum pump.
As a kind of concrete embodiment, the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
Embodiment 2
As one embodiment of the present of invention, on the basis of embodiment 1, also comprise the step revised described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure, the step of described barometric pressure correction comprises the steps: further
Gather current outside barometric pressure.
Described current outside barometric pressure and standard atmosphere are divided by and obtain barometric pressure coefficient of correction.
Barometric pressure coefficient of correction and the described vacuum pump obtained are opened threshold value and described vacuum pump to close threshold value and be multiplied, the value obtained is opened threshold value respectively as final vacuum pump and is closed threshold value.
The present invention can adjust unlatching and the closedown of vacuum pump according to current atmospheric pressure, further enhancing the performance of motor vehicle braking system.Because the vacuum pressure of external atmosphere pressure on vacuum pump also has impact, therefore the setting of threshold value also needs to revise according to the change of external atmosphere pressure, vehicle increases atmosphere pressure sensor, real-time detection external atmosphere pressure, then be divided by with standard atmosphere, with the coefficient of correction of this ratio as vacuum pressure threshold value, draw the vacuum pressure threshold value that the vacuum pump under this atmospheric pressure environment opens and closes, thus make the opening and closing threshold value of this vacuum pump be more suitable for current external environment condition.
Embodiment 3
The present invention is that a kind of brake vacuum pump opens threshold value and cuts out the control system of threshold value, as shown in Figure 2, comprising:
Information acquisition device, at least obtaining current vehicle speed information and braking information.
Threshold value setting device, for arranging the unlatching threshold value of vacuum pump according to current speed information and braking information respectively and closing threshold value, by current speed information and braking information, at least the unlatching threshold value of vacuum pump is set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and closes threshold value, under the prerequisite ensureing brake safe, reduce the work-hours of vacuum pump.
As the embodiment that other can be replaced, except above-mentioned speed information and braking information, can also in conjunction with current running conditions of vehicle as the parameter such as condition of road surface, vehicle performance arranges threshold value, when the unlatching threshold value of this vacuum pump being set by these values and closing threshold value, ensure that its scope is reasonable, reach safety arrestment and reduce the energy-conservation object of the work-hours of vacuum pump.Under the guidance of the present invention's design, those skilled in the art can complete the setting of above-mentioned threshold value in conjunction with the knowledge of this area.
The present invention arranges the unlatching threshold value of vacuum pump according to current speed information and braking information and closes threshold value, consider vehicle various working in the process of moving fully, under the prerequisite of absolute guarantee's brake safe, the work-hours of vacuum pump can be reduced to greatest extent, reduce the probability that vacuum pump breaks down owing to working long hours, effectively extend the service life of vacuum pump.
Wherein, described threshold value setting device comprises first threshold setup unit, Second Threshold setup unit, the 3rd threshold setting unit, the 4th threshold setting unit, the 5th threshold setting unit and the 6th threshold setting unit further, wherein,
Described first threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
Described Second Threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the closedown threshold value of speed-slackening signal vacuum pump in season to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
Described 3rd threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal.
Described 4th threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the closedown threshold value of speed-slackening signal vacuum pump in season to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
Described 5th threshold setting unit is used for when the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, arranges the opening and closing threshold value of vacuum pump according to the speed of a motor vehicle state of previous moment.
Described threshold value setting device comprises the 6th threshold setting unit, described 6th threshold setting unit is used for when the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and closes unlatching threshold value and the closedown threshold value that threshold value is greater than the vacuum pump when speed of a motor vehicle is greater than High Speed Threshold respectively.
When the speed of a motor vehicle is in lower-speed state, chaufeur just easier can realize braking by trampling slipper, when there being speed-slackening signal, the unlatching threshold value of vacuum pump is made to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is greater than the closedown threshold value of vacuum pump when not having speed-slackening signal, namely vacuum pump is not easy open and easily close, and can effectively reduce the period of service of vacuum pump, thus reaches the object reducing vacuum pump failure.And, due to when there is no speed-slackening signal, do not know whether chaufeur now has braking intention, therefore when there is no speed-slackening signal, what the unlatching threshold value of vacuum pump and closedown threshold value are arranged is less, when chaufeur emergency braking, can change the mode of operation of vacuum pump in time, effectively can realize snap catch, thus ensure that vehicle operating safety.
When the speed of a motor vehicle is in fast state, chaufeur just easier can not realize braking by trampling slipper, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is greater than the closedown threshold value of vacuum pump when not having speed-slackening signal, namely when vehicle is in high-speed working condition, vacuum pump is not easy open and easily close, effectively can strengthen the deceleration and stopping performance of vehicle, avoid the generation of car accident.When there being speed-slackening signal, the vacuum pressure value now detected is the vacuum pressure value after stepping on brake pedal, chaufeur steps on brake pedal, if there is not the situation of trampling slipper continuously, and vacuum pump is not also opened, illustrate that the degree of vacuum that now vacuum pump provides is enough, therefore under operating mode at this moment, the unlatching threshold value of vacuum pump is greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal, the closedown threshold value of vacuum pump is greater than the closedown threshold value of vacuum pump when not having speed-slackening signal, vacuum pump can be made comparatively to be not easy to open, comparatively easily close.
The unlatching threshold value of vacuum pump or closedown threshold value generally refer to the force value of vacuum pump, and when unlatching threshold value is larger, vacuum pump is more not easily opened; When closedown threshold value is larger, vacuum pump is more easily closed.
When the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment, effectively can avoid opening because the vacuum pump caused by car speed shake opens by mistake or closing by mistake, enhance the service life of vacuum pump.
As a detailed description of the invention of the present embodiment, the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
Embodiment 4
As one embodiment of the present of invention, on the basis of embodiment 3, system also comprises barometric pressure correcting device, revises described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure.
As a detailed description of the invention of the present embodiment, described barometric pressure correcting device comprises further:
Barometric pressure collecting unit, for gathering current outside barometric pressure.
Coefficient of correction calculating unit, obtains barometric pressure coefficient of correction for described current outside barometric pressure and standard atmosphere being divided by.
Data processing unit, close threshold value be multiplied for barometric pressure coefficient of correction and the described vacuum pump obtained being opened threshold value and described vacuum pump, the value obtained is opened threshold value respectively as final vacuum pump and is closed threshold value.
The present invention can adjust unlatching and the closedown of vacuum pump according to current atmospheric pressure, further enhancing the performance of motor vehicle braking system.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to disc storage, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the diagram of circuit of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and diagram of circuit and/or block scheme and/or square frame.These computer program instructions can being provided to the treater of general computer, single-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the treater of computing machine or other programmable data processing device produce device for realizing the function of specifying in diagram of circuit flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in diagram of circuit flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in diagram of circuit flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Claims (16)
1. brake vacuum pump opens threshold value and cuts out a control method for threshold value, it is characterized in that, comprises the steps:
Information acquiring step: at least obtain current vehicle speed information and braking information;
Threshold value setting procedure: by current speed information and braking information, at least the unlatching threshold value of vacuum pump be set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and close threshold value, ensureing brake safe and the work-hours of minimizing vacuum pump.
2. a kind of brake vacuum pump according to claim 1 opens threshold value and cuts out the control method of threshold value, and it is characterized in that, described threshold value setting procedure comprises:
When the speed of a motor vehicle is less than low velocity threshold, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal;
And/or when the speed of a motor vehicle is less than low velocity threshold, have the closedown threshold value of vacuum pump during speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
3. a kind of brake vacuum pump according to claim 1 and 2 opens threshold value and cuts out the control method of threshold value, and it is characterized in that, described threshold value setting procedure comprises:
When the speed of a motor vehicle is greater than High Speed Threshold, the unlatching threshold value of vacuum pump during speed-slackening signal is had to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal;
And/or when the speed of a motor vehicle is greater than High Speed Threshold, have the closedown threshold value of vacuum pump during speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
4. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 1-3 and close the control method of threshold value, it is characterized in that, described threshold value setting procedure comprises:
When the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, the opening and closing threshold value of vacuum pump is set according to the speed of a motor vehicle state of previous moment.
5. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 1-4 and close the control method of threshold value, it is characterized in that, described threshold value setting procedure comprises:
When the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and close threshold value and be greater than the unlatching threshold value of the vacuum pump when speed of a motor vehicle is greater than High Speed Threshold respectively and close threshold value.
6. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 1-5 and close the control method of threshold value, it is characterized in that, the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
7. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 1-6 and close the control method of threshold value, it is characterized in that, also comprise and according to current atmospheric pressure threshold value is opened to described vacuum pump and close the step that threshold value revises.
8. a kind of brake vacuum pump according to claim 7 opens threshold value and cuts out the control method of threshold value, it is characterized in that, the described step revised described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure, comprises further:
Gather current outside barometric pressure;
Described current outside barometric pressure and standard atmosphere are divided by and obtain barometric pressure coefficient of correction;
Barometric pressure coefficient of correction and the described vacuum pump obtained are opened threshold value and described vacuum pump to close the threshold value value obtained that is multiplied and open threshold value as final vacuum pump and close threshold value.
9. brake vacuum pump opens threshold value and cuts out a control system for threshold value, it is characterized in that, comprising:
Information acquisition device, at least obtaining current vehicle speed information and braking information;
Threshold value setting device, for by current speed information and braking information, at least the unlatching threshold value of vacuum pump be set respectively according to the speed height of vehicle and size two amounts of speed-slackening signal and close threshold value, ensureing brake safe and the work-hours of minimizing vacuum pump.
10. a kind of brake vacuum pump according to claim 9 opens threshold value and cuts out the control system of threshold value, and it is characterized in that, described threshold value setting device comprises:
First threshold setup unit, described first threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal;
And/or Second Threshold setup unit, described Second Threshold setup unit is used for when the speed of a motor vehicle is less than low velocity threshold, has the closedown threshold value of speed-slackening signal vacuum pump in season to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
11. a kind of brake vacuum pumps according to claim 9 or 10 open threshold value and cut out the control system of threshold value, and it is characterized in that, described threshold value setting device comprises
3rd threshold setting unit, described 3rd threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the unlatching threshold value of speed-slackening signal vacuum pump in season to be greater than the unlatching threshold value of vacuum pump when not having speed-slackening signal;
And/or the 4th threshold setting unit, described 4th threshold setting unit is used for when the speed of a motor vehicle is greater than High Speed Threshold, has the closedown threshold value of the seasonal vacuum pump of speed-slackening signal to be greater than the closedown threshold value of vacuum pump when not having speed-slackening signal.
12. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 9-11 and close the control system of threshold value, it is characterized in that, described threshold value setting device also comprises the 5th threshold setting unit, described 5th threshold setting unit is used for when the speed of a motor vehicle is between low velocity threshold and High Speed Threshold, arranges the opening and closing threshold value of vacuum pump according to the speed of a motor vehicle state of previous moment.
13. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 9-12 and close the control system of threshold value, it is characterized in that, described threshold value setting device also comprises the 6th threshold setting unit, described 6th threshold setting unit is used for when the speed of a motor vehicle is less than low velocity threshold, makes the unlatching threshold value of vacuum pump and closes unlatching threshold value and the closedown threshold value of vacuum pump when threshold value is greater than High Speed Threshold higher than the speed of a motor vehicle respectively.
14. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 9-13 and close the control system of threshold value, and it is characterized in that, the aperture of brake pedal is greater than setting value and indicates speed-slackening signal; The aperture of brake pedal is less than or equal to this setting value and represents brakeless signal.
15. open threshold value according to the arbitrary described a kind of brake vacuum pump of claim 9-14 and close the control system of threshold value, it is characterized in that, system also comprises barometric pressure correcting device, revises described vacuum pump unlatching threshold value and closedown threshold value according to current atmospheric pressure.
16. a kind of brake vacuum pumps according to claim 15 open threshold value and cut out the control system of threshold value, and it is characterized in that, described barometric pressure correcting device comprises further:
Barometric pressure collecting unit, for gathering current outside barometric pressure;
Coefficient of correction calculating unit, obtains barometric pressure coefficient of correction for described current outside barometric pressure and standard atmosphere being divided by;
Data processing unit, close threshold value be multiplied for barometric pressure coefficient of correction and the described vacuum pump obtained being opened threshold value and described vacuum pump, the value obtained is opened threshold value respectively as final vacuum pump and is closed threshold value.
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| CN201410222866.7A CN104842988B (en) | 2014-05-23 | 2014-05-23 | A kind of brake vacuum pump opens threshold value and closes the control method and system of threshold value |
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Effective date of registration: 20180509 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee after: Beijing treasure Car Co.,Ltd. Address before: 102206, Beijing, Shahe Town, Changping District Road, sand Yang Patentee before: BEIQI FOTON MOTOR Co.,Ltd. |
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