CN108909700A - A kind of control device and method of electric vacuum pump - Google Patents
A kind of control device and method of electric vacuum pump Download PDFInfo
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- CN108909700A CN108909700A CN201810614320.4A CN201810614320A CN108909700A CN 108909700 A CN108909700 A CN 108909700A CN 201810614320 A CN201810614320 A CN 201810614320A CN 108909700 A CN108909700 A CN 108909700A
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The present invention relates to vehicle chassis fields, propose a kind of control device and method of electric vacuum pump.Described device includes control variable acquisition module, vacuum sensor, Motorized vacuum pump control module, vacuum booster and electric vacuum pump.Controlling variable acquisition module includes barometric pressure sensor and wheel speed sensors, Motorized vacuum pump control module includes vacuum degree obtaining unit and vacuum degree judging unit, vacuum degree obtaining unit is used for according to vehicle speed information and atmospheric pressure value, it obtains the unlatching vacuum degree of electric vacuum pump and closes vacuum degree, vacuum degree judging unit is used for the unlatching vacuum degree by current vacuum level and electric vacuum pump or closes vacuum degree comparison, judges whether to need to open or close electric vacuum pump.The present invention codetermines the unlatching vacuum degree of vacuum pump by speed and atmospheric pressure value and closes vacuum degree, can more precisely judge the vacuum degree suitable for conditions present, ensure that braking ability.
Description
Technical field
The present invention relates to vehicle chassis field more particularly to a kind of control device and methods of electric vacuum pump.
Background technique
The convenience of urban development and traffic, so that vehicle becomes people and commonly goes on a journey tool, therefore in traffic safety
More people is needed to pay attention to.The braking system of vehicle can guarantee that vehicle can stop in time, together when driver brakes
When braking system in assist force aid system, can reduce the operating force that driver applies brake pedal, so that driver
Vehicle can be checked by not needing the very big power of application.Assisting force aid system is usually vacuum servo auxiliary system, within the system,
Vacuum degree plays an important role.
Electric car lacks engine and assists performance requirement needed for forming negative pressure and a part of conventional truck higher, because
This needs to introduce electric vacuum pump, assists the adjustment that vacuum degree is carried out to vacuum booster, the performance of support vehicles.
The prior art is that the start and stop of vacuum pump are controlled by vacuum pressure sensor, when vacuum booster or vacuum tank internal pressure
Vacuum pump is started to work when force value is higher than a certain pressure, and when vacuum tank internal pressure force value is lower than a certain pressure value, vacuum pump stops work
Make, unreasonable there is a problem of that service life of vacuum pump is low and pedal feel is poor since control strategy designs.
In addition, common vacuum pump control strategy is single unlatching, closes threshold values in the market, biography can not be sufficiently simulated
Requirement (naturally aspirated engine and engine with supercharger brake demand to vacuum degree) of the system vehicle to vacuum degree, will cause high speed
Operating condition braking ability is insufficient or speed operation pedal sense is not good enough, influences drive safety and comfort, and Motorized vacuum when plateau
Frequent operation is pumped, course continuation mileage is reduced, vacuum pump noise is big.
Summary of the invention
The technical problem to be solved by the present invention is to the single problems of electric vacuum pump control strategy.In order to solve described ask
Topic, the invention proposes a kind of control device and method of electric vacuum pump, the present invention is specifically with the realization of following technical solution
's：
The first aspect of the invention proposes a kind of control device of electric vacuum pump, and described device includes：Vacuum degree
Sensor, control variable acquisition module, Motorized vacuum pump control module, vacuum booster and electric vacuum pump；
The control variable acquisition module includes barometric pressure sensor and wheel speed sensors, the barometric pressure sensor
For obtaining the atmospheric pressure value of external environment, the wheel speed sensors are for obtaining the current vehicle speed information of vehicle；
The vacuum sensor is used to obtain the current vacuum level of vacuum booster；
The Motorized vacuum pump control module includes vacuum degree obtaining unit and vacuum degree judging unit, and the vacuum degree obtains
Unit is obtained to be used to obtain the unlatching vacuum degree of electric vacuum pump according to vehicle speed information and atmospheric pressure value and close vacuum degree, institute
Vacuum degree judging unit is stated for comparing the unlatching vacuum degree of current vacuum level and electric vacuum pump, by current vacuum level and electricity
The closing vacuum degree comparison of dynamic vacuum pump, judges whether to need to open or close electric vacuum pump.
Further, the vacuum degree obtaining unit passes through corresponding default letter according to vehicle speed information and atmospheric pressure value
Breath obtains current unlatching vacuum degree and is presently off vacuum degree, and the presupposed information is according to preset vehicle speed information and atmospheric pressure
Force value, pre-stored unlatching vacuum degree corresponding with the two variables and closing vacuum degree.
Further, the vacuum degree judging unit obtains the current vacuum level of vacuum sensor acquisition, and root in real time
According to vacuum degree obtaining unit obtain current unlatching vacuum degree and be presently off vacuum degree, judge whether to need to open or close electricity
Dynamic vacuum pump.
Further, current vacuum degree, the Motorized vacuum pump control module control are opened when judging that current vacuum level is less than
Electric vacuum pump processed is opened.When judging current vacuum level lower than vacuum degree is opened, illustrates that vacuum degree is improper, need to open electricity
Dynamic vacuum pump, adjusts the vacuum degree of vacuum booster.
Further, when judging current vacuum level more than or equal to vacuum degree is presently off, the electric vacuum pump control
Molding block controls electric vacuum pump and closes.When judging that current vacuum level is higher than closing vacuum degree, illustrate that vacuum degree has been conjunction
Just when needing to close electric vacuum pump, keep the vacuum degree of vacuum booster.
Specifically, it is right that different atmospheric pressure value and travel speed institute has been stored in advance in the Motorized vacuum pump control module
The electric vacuum pump answered is opened electric vacuum pump corresponding to vacuum degree and different atmospheric pressure value and travel speed and is closed very
Reciprocal of duty cycle, the unlatching vacuum degree and closing vacuum degree are codetermined by atmospheric pressure value and travel speed.Electronic true
When empty pump control module obtains real-time atmospheric pressure value and travel speed, by the comparison with default value, electricity can be obtained
The unlatching vacuum degree and closing vacuum degree of dynamic vacuum pump.The Motorized vacuum pump control module will open vacuum degree and close vacuum
Degree is compared with the current vacuum level obtained, is judged whether to need to open electric vacuum pump, is judged whether to need to close vacuum degree.Root
It is judged that result formulates corresponding control strategy, the opening and closing of electric vacuum pump are controlled, so that electric vacuum pump keeps suitable
When vacuum degree to vacuum booster, to ensure that braking ability.
Further, the calculation formula for opening vacuum degree is：
When speed is in 0-1km/h, the unlatching vacuum degree M=x1×P。
When speed is in 1-10km/h, the unlatching vacuum degree M=(x2v+y2)×P。
When speed is in 10-30km/h, the unlatching vacuum degree M=(x3v+y3)×P。
When speed is in 30-90km/h, the unlatching vacuum degree M=x4×P。
When speed is in 90-100km/h, the unlatching vacuum degree M=(x5v+y5)×P。
As speed > 100km/h, the unlatching vacuum degree M=x6×P。
The P is atmospheric pressure value, and the v is current vehicle speed, the x1、x2、x3、x4、x5And x6And y2、y3、y5For
Coefficient.
Further, the calculation formula for closing vacuum degree is：
When speed is in 0-1km/h, the closing vacuum degree N=X1×P。
When speed is in 1-10km/h, the closing vacuum degree N=(X2v+Y2)×P。
When speed is in 10-30km/h, the closing vacuum degree N=(X3v+Y3)×P。
When speed is in 30-90km/h, the closing vacuum degree N=X4×P。
When speed is in 90-100km/h, the closing vacuum degree N=(X5v+Y5)×P。
As speed > 100km/h, the closing vacuum degree N=X6×P。
The P is atmospheric pressure value, and the v is current vehicle speed, the X1、X2、X3、X4、X5And X6And Y2、Y3、Y5For
Coefficient.
The second aspect of the invention proposes a kind of control method of electric vacuum pump, the method includes：
Obtain vehicle speed information；
Obtain atmospheric pressure value；
Obtain the current vacuum level of vacuum booster；
According to vehicle speed information and atmospheric pressure value, the unlatching vacuum degree of electric vacuum pump is obtained by corresponding presupposed information
And close vacuum degree；
The unlatching vacuum degree and closing vacuum degree of current vacuum level and electric vacuum pump are compared, it is determined whether to enable
Or close electric vacuum pump.
Further, when the current vacuum level of vacuum booster is less than the unlatching vacuum degree of electric vacuum pump, electricity is opened
Dynamic vacuum pump.When judging current vacuum level lower than vacuum degree is opened, illustrates that vacuum degree is improper, need to open Motorized vacuum
Pump, adjusts the vacuum degree of vacuum booster.
Further, when the current vacuum level of vacuum booster is greater than or equal to the closing vacuum degree of electric vacuum pump,
Close electric vacuum pump.When judging that current vacuum level is higher than closing vacuum degree, illustrates that vacuum degree has been desired value, need to close
Electric vacuum pump is closed, the vacuum degree of vacuum booster is kept.
Specifically, it is right that different atmospheric pressure value and travel speed institute has been stored in advance in the Motorized vacuum pump control module
The electric vacuum pump answered is opened electric vacuum pump corresponding to vacuum degree and different atmospheric pressure value and travel speed and is closed very
Reciprocal of duty cycle, the unlatching vacuum degree and closing vacuum degree are codetermined by atmospheric pressure value and travel speed.Electronic true
When empty pump control module obtains real-time atmospheric pressure value and travel speed, by the comparison with default value, electricity can be obtained
The unlatching vacuum degree and closing vacuum degree of dynamic vacuum pump.The Motorized vacuum pump control module will open vacuum degree and close vacuum
Degree is compared with the current vacuum level obtained, is judged whether to need to open electric vacuum pump, is judged whether to need to close vacuum degree, root
It is judged that result formulates corresponding control strategy, the opening and closing of electric vacuum pump are controlled, so that electric vacuum pump keeps suitable
When vacuum degree to vacuum booster, to ensure that braking ability.
By adopting the above technical scheme, the control device and method of a kind of electric vacuum pump of the present invention has as follows
Beneficial effect：
1) control device and method of a kind of electric vacuum pump proposed by the present invention, it is common by speed and atmospheric pressure value
The unlatching vacuum degree and closing vacuum degree of decision vacuum pump, can more precisely judge suitable for current vehicle speed and currently big
The vacuum degree of air pressure force value has more flexible judgment basis, but also braking ability is guaranteed；
2) control device and method of a kind of electric vacuum pump proposed by the present invention, introduces speed as Rule of judgment,
Electric vacuum pump is opened, closes threshold values difference under different speeds, and higher vacuum degree can be provided in high-speed working condition, improves system
Dynamic performance reduces electric vacuum pump working frequency, improves service life of vacuum pump, reduce noise in speed operation；
3) control device and method of a kind of electric vacuum pump proposed by the present invention introduces atmospheric pressure conduct and judges item
Part, electric vacuum pump is opened under varying environment atmospheric pressure, to close threshold values different, and higher vacuum degree can be provided on Plain,
Braking ability is improved, at plateau, under the premise of guaranteeing braking ability, electric vacuum pump working frequency is reduced, improves vacuum pump
Service life reduces noise.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of the control device of electric vacuum pump provided in an embodiment of the present invention；
Fig. 2 is a kind of Motorized vacuum pump control module of the control device of electric vacuum pump provided in an embodiment of the present invention
Structural schematic diagram；
Fig. 3 is that a kind of electric vacuum pump of control device of electric vacuum pump provided in an embodiment of the present invention is opened, closed
Threshold value and speed, atmospheric pressure relational graph；
Fig. 4 is a kind of flow chart of the control method of electric vacuum pump provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
Each functional unit in each embodiment of the present invention can integrate in a processing module, be also possible to each
Unit physically exists alone, and can also be integrated in a module with two or more units.
Embodiment 1：
A kind of control device of electric vacuum pump is provided in the embodiment of the present invention, as shown in Figure 1, described device includes：
Barometric pressure sensor, vacuum sensor, wheel speed sensors, Motorized vacuum pump control module, vacuum booster and electronic true
Sky pump.
The barometric pressure sensor is used to obtain the atmospheric pressure value of external environment and feeds back to electric vacuum pump and controls
Module, the vacuum sensor, which is used to obtain the vacuum degree signal of vacuum booster and feeds back to electric vacuum pump, controls mould
Block, the wheel speed sensors are used to calculate the travel speed for obtaining vehicle and feed back to Motorized vacuum pump control module, the electricity
Vacuum pump control module is moved according to atmospheric pressure value, vacuum degree signal and travel speed, the unlatching of electric vacuum pump is controlled and closes
It closes.
The control device of the electric vacuum pump further includes wheel speed sensors, and the wheel speed sensors are for obtaining wheel speed letter
Breath, the wheel speed sensors carry out the calculating of speed according to wheel speed information.
Electricity corresponding to different atmospheric pressure value and travel speed has been stored in advance in the Motorized vacuum pump control module
Dynamic vacuum pump opens electric vacuum pump corresponding to vacuum degree and different atmospheric pressure value and travel speed and closes vacuum degree.
It, can by the comparison with default value when Motorized vacuum pump control module obtains real-time atmospheric pressure value and travel speed
To obtain the unlatching vacuum degree of electric vacuum pump and close vacuum degree.The Motorized vacuum pump control module will open vacuum degree and
The current vacuum level for closing vacuum degree and acquisition compares, and judges whether to need to open electric vacuum pump, judges whether to need to close
Vacuum degree controls the opening and closing of electric vacuum pump according to judging result, so that electric vacuum pump keeps vacuum degree appropriate
To vacuum booster, to ensure that braking ability.
As shown in Fig. 2, the Motorized vacuum pump control module includes vacuum degree obtaining unit and vacuum degree judging unit, institute
Vacuum degree obtaining unit is stated for obtaining the unlatching vacuum degree and closing of electric vacuum pump according to vehicle speed information and atmospheric pressure value
Vacuum degree.The acquisition pattern of the vacuum degree can be to be obtained by tabling look-up, and the table is seen below.The vacuum degree can also lead to
It crosses functional relation and calculates acquisition, the relationship of speed as shown in Figure 3, atmospheric pressure and vacuum degree.The vacuum degree judging unit
For the current vacuum level according to vacuum booster, the unlatching vacuum degree of the electric vacuum pump obtained with vacuum degree obtaining unit and
Vacuum degree comparison is closed, judges whether to need to open or close electric vacuum pump.
Shown in following two tables, the unlatching vacuum degree and closing vacuum degree are not under different atmospheric pressure and speed
Same numerical value：
Above table be can use into piecewise function and be summarized as following formula：
Open vacuum degree M：
Wherein, P is atmospheric pressure value, and unit kPa, by barometric pressure sensor real-time detection, V is speed, and unit is
Km/h, by wheel speed sensors real-time detection, the x1、x2、x3、x4、x5And x6And y2、y3、y5For coefficient.
Close vacuum degree N：
Wherein, P is atmospheric pressure value, and unit kPa, by barometric pressure sensor real-time detection, V is speed, and unit is
Km/h, by wheel speed sensors real-time detection, the X1、X2、X3、X4、X5And X6And Y2、Y3、Y5For coefficient.
The detection to current vacuum level, and the acquisition of unlatching vacuum degree and closing vacuum degree to electric vacuum pump
It is all real-time.When the current vacuum level of vacuum booster is less than the unlatching vacuum degree of electric vacuum pump, Motorized vacuum is opened
Pump, adjusts the vacuum degree of vacuum booster.When judging current vacuum level lower than vacuum degree is opened, illustrate that vacuum degree is improper,
It needs to open electric vacuum pump, adjusts the vacuum degree of vacuum booster.
When the current vacuum level of vacuum booster is greater than or equal to the closing vacuum degree of electric vacuum pump, close electronic true
Sky pump, keeps the vacuum degree of vacuum booster.When judging that current vacuum level is higher than closing vacuum degree, illustrate that vacuum degree has been
Desired value needs to close electric vacuum pump, keeps the vacuum degree of vacuum booster.
Electric vacuum pump can provide enough vacuum degrees for vacuum booster, to guarantee the braking ability of vehicle, be applicable in
In the new-energy automobile of not vacuum source, part is also applied for the higher vehicle of performance requirement.It needs when speed is lower to system
The controllability of dynamic deceleration and pedal, can keep relatively low vacuum degree, require when speed is higher to braking distance,
It needs that just there is enough vacuum degrees in initial phase, vehicle is sufficiently braked in emergency brake.And due to height above sea level
Difference, external atmosphere pressure is different, and required vacuum degree can also change.A kind of electric vacuum pump described in the present embodiment
Control device, suitable vacuum pump is formulated according to speed and external atmosphere pressure and is opened and the control program of closure, to guarantee to make
Dynamic performance.
Specifically, vehicle under steam when, wheel speed sensors obtain the wheel speed of vehicle, and wheel speed sensors calculate real-time vehicle
Speed is simultaneously fed back to Motorized vacuum pump control module.Meanwhile Motorized vacuum pump control module can also pass through barometric pressure sensor
Obtain the atmospheric pressure value of current external and the vacuum degree that vacuum booster is current.It is pre- in the Motorized vacuum pump control module
It first stores under the joint effect of the two variables of atmospheric pressure value and speed, the unlatching vacuum degree of electric vacuum pump and closing
Vacuum degree.According to current speed and external atmospheric pressure value, Motorized vacuum pump control module control electric vacuum pump is opened
It opens and is closed, the vacuum degree of vacuum booster is adjusted, maintain suitable vacuum degree, guarantee that there is foot when vehicle brake
Enough brake pressures.
The Motorized vacuum pump control module carry out vacuum degree acquisition be in real time, can be after being spaced preset time again
Secondary acquisition, it is ensured that can the vacuum degree to vacuum booster monitored in real time.The unlatching vacuum degree and closing vacuum degree
Also can change with the variation of atmospheric pressure value and speed, the Motorized vacuum pump control module can obtain these in time
Information, so that vacuum degree is judged and be adjusted in real time.
When further, in vehicle driving, the barometric pressure sensor obtains current atmospheric pressure value, the wheel speed
Current vehicle speed is calculated in sensor, by the default unlatching vacuum degree that can obtain electric vacuum pump at this time and closes vacuum
Degree, the Motorized vacuum pump control module obtain the vacuum degree of vacuum booster at this time, judge whether to need to open Motorized vacuum
Pump.Vacuum degree is opened when the vacuum degree of vacuum booster at this time is less than, electric vacuum pump is opened, and the vacuum of vacuum booster is adjusted
Degree, when vacuum degree, which reaches, closes vacuum degree, electric vacuum pump is closed, and keeps the vacuum degree of vacuum booster.
Further, also there is fault pre-alarming module, when vacuum booster in the control device of the electric vacuum pump
Vacuum degree lower than preset value, barometric pressure sensor can't detect atmospheric pressure, Motorized vacuum pump control module can not obtain vehicle
Fast information perhaps Motorized vacuum failure of pump when the fault pre-alarming module shown and mention by voice, light flash or display screen
Awake driver pays attention to.When barometric pressure sensor can't detect atmospheric pressure, taking atmospheric pressure is preset definite value, by pre-
If using speed as the relationship with vacuum degree of variable in, Motorized vacuum pump control module controls the unlatching of electric vacuum pump and closes
It closes, the vacuum degree of vacuum booster is adjusted.When Motorized vacuum pump control module can not obtain vehicle speed information, pick-up height
The speed of speed when driving, maintains the vacuum degree under high vehicle speeds, to guarantee having enough brake force.
A kind of control device of electric vacuum pump, the control device described in the present embodiment can be applied to new energy vapour
Vehicle requires on more accurate orthodox car vacuum degree control, and the Motorized vacuum pump control module is according to atmospheric pressure
And speed, the opening and closing of electric vacuum pump are controlled, the vacuum degree of vacuum booster is adjusted, so that changing in speed
And during altitude change, vehicle all maintains suitable vacuum degree, has good environmental suitability, also improves simultaneously
The safety of vacuum boost system, so that the brake force of vehicle in the case where environmental change, can also be guaranteed, improve use
The usage experience at family.In addition, reducing electric vacuum pump working frequency also under the premise of guaranteeing braking ability, improving the vacuum pump longevity
Life reduces noise.
Embodiment 2：
A kind of control method of electric vacuum pump is provided in the embodiment of the present invention, as shown in figure 4, the method includes：
S1. Motorized vacuum pump control module obtains vehicle speed information；
S2. Motorized vacuum pump control module obtains atmospheric pressure value；
S3. Motorized vacuum pump control module obtains the current vacuum level of vacuum booster；
S4. according to vehicle speed information and atmospheric pressure value, the unlatching that Motorized vacuum pump control module obtains electric vacuum pump is true
Reciprocal of duty cycle and closing vacuum degree；
S5. the unlatching vacuum degree and closing vacuum degree of current vacuum level and electric vacuum pump are compared, is judged whether
Open or close electric vacuum pump.
Further, when the current vacuum level of vacuum booster is less than the unlatching vacuum degree of electric vacuum pump, electricity is opened
Dynamic vacuum pump, increases the vacuum degree of vacuum booster.When vacuum degree is lower than vacuum degree is opened, illustrate that vacuum degree is improper, needs
Electric vacuum pump is opened, the vacuum degree of vacuum booster is adjusted.
Further, when the current vacuum level of vacuum booster is greater than or equal to the closing vacuum degree of electric vacuum pump,
Electric vacuum pump is closed, the vacuum degree of vacuum booster is kept.When vacuum degree, which is higher than, closes vacuum degree, illustrate vacuum degree
It for desired value, needs to close electric vacuum pump, keeps the vacuum degree of vacuum booster.
Specifically, vehicle under steam when, wheel speed sensors obtain vehicle wheel speed, calculate real-time speed and feed back arrive
Motorized vacuum pump control module.Meanwhile different atmospheric pressure value and row has been stored in advance in the Motorized vacuum pump control module
It sails electronic true corresponding to the unlatching vacuum degree of electric vacuum pump corresponding to speed and different atmospheric pressure value and travel speed
Sky pump closes vacuum degree.When Motorized vacuum pump control module obtains real-time atmospheric pressure value and travel speed, by with it is pre-
If the comparison of numerical value, the unlatching vacuum degree of electric vacuum pump can be obtained and close vacuum degree.The electric vacuum pump controls mould
Block will open vacuum degree and close the current vacuum level comparison of vacuum degree and acquisition, judge whether to need to open electric vacuum pump,
Judge whether to need to close vacuum degree, the opening and closing of electric vacuum pump is controlled according to judging result, so that electric vacuum pump
Keep vacuum degree appropriate to vacuum booster, to ensure that braking ability.
When further, in vehicle driving, the barometric pressure sensor obtains current atmospheric pressure value, the wheel speed
The information that sensor obtains, is calculated current vehicle speed, passes through the default unlatching vacuum degree that can obtain electric vacuum pump at this time
With closing vacuum degree, the Motorized vacuum pump control module obtains the vacuum degree of vacuum booster at this time, judges whether to need to open
Open electric vacuum pump.Vacuum degree is opened when the vacuum degree of vacuum booster at this time is less than, electric vacuum pump is opened, so that vacuum helps
Power device obtains vacuum degree, and when vacuum degree, which reaches, closes vacuum degree, electric vacuum pump is closed, and keeps the vacuum of vacuum booster
Degree.
A kind of control method of electric vacuum pump, the control device described in the present embodiment can be applied to new energy vapour
Vehicle requires on more accurate orthodox car vacuum degree control, and the Motorized vacuum pump control module is according to atmospheric pressure
And speed, the opening and closing of electric vacuum pump are controlled, the vacuum degree of vacuum booster is adjusted, so that changing in speed
And during altitude change, vehicle all maintains suitable vacuum degree, has good environmental suitability, also improves simultaneously
The safety of vacuum boost system, so that the brake force of vehicle in the case where environmental change, can also be guaranteed, improve use
The usage experience at family.In addition, reducing electric vacuum pump working frequency also under the premise of guaranteeing braking ability, improving the vacuum pump longevity
Life reduces noise.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of control device of electric vacuum pump, which is characterized in that described device includes：Vacuum sensor, control variable
Acquisition module, Motorized vacuum pump control module, vacuum booster and electric vacuum pump；
The control variable acquisition module includes barometric pressure sensor and wheel speed sensors, and the barometric pressure sensor is used for
The atmospheric pressure value of external environment is obtained, the wheel speed sensors are for obtaining the current vehicle speed information of vehicle；
The vacuum sensor is used to obtain the current vacuum level of vacuum booster；
The Motorized vacuum pump control module includes vacuum degree obtaining unit and vacuum degree judging unit, and the vacuum degree obtains single
Member is described true for obtaining the unlatching vacuum degree of electric vacuum pump and closing vacuum degree according to vehicle speed information and atmospheric pressure value
Reciprocal of duty cycle judging unit is used to compare the unlatching vacuum degree of current vacuum level and electric vacuum pump, by current vacuum level and electronic true
The closing vacuum degree comparison of sky pump, judges whether to need to open or close electric vacuum pump.
2. a kind of control device of electric vacuum pump according to claim 1, which is characterized in that the vacuum degree obtains single
Member obtains current unlatching vacuum degree by corresponding presupposed information and is presently off vacuum according to vehicle speed information and atmospheric pressure value
Degree, the presupposed information are according to preset vehicle speed information and atmospheric pressure value, and pre-stored unlatching vacuum degree and closing are true
Reciprocal of duty cycle.
3. a kind of control device of electric vacuum pump according to claim 2, which is characterized in that the vacuum degree judgement is single
First current vacuum level for obtaining vacuum sensor in real time and obtaining, and the current unlatching vacuum obtained according to vacuum degree obtaining unit
Vacuum degree is spent and be presently off, judges whether to need to open or close electric vacuum pump.
4. a kind of control device of electric vacuum pump according to claim 3, which is characterized in that when judging current vacuum level
Open vacuum degree less than current, or greater than it is current open vacuum degree and be less than be presently off vacuum degree when, the Motorized vacuum
Pump control module controls electric vacuum pump and opens.
5. a kind of control device of electric vacuum pump according to claim 3, which is characterized in that when judging current vacuum level
When more than or equal to being presently off vacuum degree, the Motorized vacuum pump control module control electric vacuum pump is closed.
6. a kind of control device of electric vacuum pump according to claim 1, which is characterized in that the unlatching vacuum degree
Calculation formula is：
When speed is in 0-1km/h, the unlatching vacuum degree M=x1×P；
When speed is in 1-10km/h, the unlatching vacuum degree M=(x2v+y2)×P；
When speed is in 10-30km/h, the unlatching vacuum degree M=(x3v+y3)×P；
When speed is in 30-90km/h, the unlatching vacuum degree M=x4×P；
When speed is in 90-100km/h, the unlatching vacuum degree M=(x5v+y5)×P；
As speed > 100km/h, the unlatching vacuum degree M=x6×P；
The P is atmospheric pressure value, and the v is current vehicle speed, the x1、x2、x3、x4、x5And x6And y2、y3And y5To be
Number.
7. a kind of control device of electric vacuum pump according to claim 1, which is characterized in that the closing vacuum degree
Calculation formula is：
When speed is in 0-1km/h, the closing vacuum degree N=X1×P；
When speed is in 1-10km/h, the closing vacuum degree N=(X2v+Y2)×P；
When speed is in 10-30km/h, the closing vacuum degree N=(X3v+Y3)×P；
When speed is in 30-90km/h, the closing vacuum degree N=X4×P；
When speed is in 90-100km/h, the closing vacuum degree N=(X5v+Y5)×P；
As speed > 100km/h, the closing vacuum degree N=X6×P；
The P is atmospheric pressure value, and the v is current vehicle speed, the X1、X2、X3、X4、X5And X6And Y2、Y3And Y5To be
Number.
8. a kind of control method of electric vacuum pump, which is characterized in that the method includes：
Obtain vehicle speed information；
Obtain atmospheric pressure value；
Obtain the current vacuum level of vacuum booster；
According to vehicle speed information and atmospheric pressure value, unlatching vacuum degree and the pass of electric vacuum pump are obtained by corresponding presupposed information
Close vacuum degree；
By the unlatching vacuum degree of current vacuum level and electric vacuum pump and close vacuum degree and compare, it is determined whether to enable or close
Close electric vacuum pump.
9. a kind of control method of electric vacuum pump according to claim 8, which is characterized in that when working as vacuum booster
When initial vacuum degree is less than the unlatching vacuum degree of electric vacuum pump, electric vacuum pump is opened.
10. a kind of control method of electric vacuum pump according to claim 8, which is characterized in that when vacuum booster
When current vacuum level is greater than or equal to the closing vacuum degree of electric vacuum pump, electric vacuum pump is closed.
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