CN106314406B - A kind of control method and device of force aid system for braking - Google Patents
A kind of control method and device of force aid system for braking Download PDFInfo
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- CN106314406B CN106314406B CN201610801229.4A CN201610801229A CN106314406B CN 106314406 B CN106314406 B CN 106314406B CN 201610801229 A CN201610801229 A CN 201610801229A CN 106314406 B CN106314406 B CN 106314406B
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- pressure sensor
- vacuum pressure
- electromagnetic interference
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The present invention provides a kind of control method and device of force aid system for braking, wherein force aid system for braking includes vacuum booster, the vacuum pump connecting with vacuum booster and the vacuum pressure sensor for detecting the vacuum degree inside vacuum booster, and control method includes: the current working status for monitoring vacuum pressure sensor；According to the current working status of vacuum pressure sensor, detect whether vacuum pressure sensor is currently in electromagnetic interference state；When vacuum pressure sensor is in electromagnetic interference state, control vacuum pump switches to immunity mode and works；When vacuum pressure sensor is in non-electromagnetic interference state, control vacuum pump switches to normal mode and works.The present invention can effectively alleviate the frequently unexpected unlatching of the vacuum pump due to caused by electromagnetic interference, and thus caused vacuum pump overheat even burnout problems, eliminate security risk, while also ensuring the brake boost demand of driver.
Description
Technical field
The present invention relates to automobile technical field more particularly to a kind of control method and device of force aid system for braking.
Background technique
In face of increasingly severe energy and environment problem, conventional fuel oil automobile is to the increase of petroleum resources demand and brings
Environmental pollution increasingly caused the concern of people, energy conservation is just becoming the hot spot of various countries' research with new-energy automobile at the same time.
Energy conservation as one of China's strategic emerging industries has obtained the great attention of government and industry with new-energy automobile, develops
New-energy automobile, the especially pure electric automobile with no pollution, zero-emission, not only have Chinese energy safety, environmental protection
Be of great importance, at the same be also China's automotive field realize transition and upgrade, technological break-through important directions, be automotive field from now on
The trend of development.
Different from conventional fuel oil car, the energy of pure electric automobile is utilized from high voltage power battery, super capacitor etc.
Motor replaces internal combustion engine to drive executing agency, to achieve the purpose that normal vehicle operation.Compared with conventional fuel oil car, pure electric vehicle vapour
Power equipment and device are largely used in vehicle, this makes pure electric automobile have many advantages, such as zero-emission, pollution-free, but and this
Meanwhile also for pure electric automobile bring electromagnetic compatibility this can not be ignored the problem of.Pure electric automobile in the process of moving, vehicle
On power equipment subject the influence of various electromagnetic interference source outside interior and vehicle, and interior electromagnetic interference source
Synthesis to the electromagnetic disturbance emitted outside interior and vehicle.Equipped with power battery, driving motor, power conversion in pure electric automobile
The components such as motor compressor, thermistor in device, electric machine controller and on-board air conditioner belong to high voltage with upper-part
Device systems outside interior and vehicle can be caused electromagnetic interference by high-current equipment during the work time, this electromagnetic interference or with
The form of electromagnetic wave is propagated outward, or to other equipment or system by way of connected harness interference electric current
It propagates.At the same time, it is also possible to interference by extraneous various electromagnetic interference sources, these interference sources when pure electric automobile works
Big high voltage transmission line, large-scale power grid and the thunder and lightning for arriving roadside, small to mobile, radio, electrostatic etc..It can be seen that pure
Electromagnetic interference environment when electric car works is considerably complicated, and the existing electromagnetism generated from in-vehicle device or component and harness is dry
It disturbs, and including potential electromagnetic interferences various in vehicle external environment.Therefore, for pure electric automobile by controlling party under electromagnetic interference
The research of method is of great significance for the drive safety and stability that improve pure electric automobile.
Pure electric automobile mostly uses greatly electric vacuum pump to provide vacuum source for force aid system for braking at present, specially in vacuum
Pressure sensor, the pressure value control that force aid system for braking controller is collected according to sensor are packed into tank or brake booster
Vacuum pump work processed generally uses bang-bang control, i.e. vacuum degree opens vacuum pump lower than certain threshold value, when vacuum degree is higher than one
Vacuum pump is closed after determining threshold value, to guarantee the brake boost demand of driver.Under normal circumstances, the vacuum tank of pure electric automobile
Or brake booster is arranged in the forward engine room of vehicle, compresses with electric machine controller, driving motor, power inverter, electric air-conditioning
The high power components such as machine close on, if the shielded layer of sensor itself or signal wire is damaged or shielded layer damage, hold very much
Vulnerable to the influence of electromagnetic interference, such as sensor signal since interference can not reflect true value.Force aid system for braking at this time
Job stability is affected, and certain harm is generated to traffic safety.
Summary of the invention
The embodiment of the present invention provides a kind of control method and device of force aid system for braking, to solve to sense in the prior art
Device signal can not reflect true value due to being interfered, and the steady operation of force aid system for braking is affected, to traffic safety
It leads to the problem of and centainly endangers.
The embodiment of the present invention provides a kind of control method of force aid system for braking, and the force aid system for braking includes that vacuum helps
Power device, the vacuum pump being connect with the vacuum booster and the vacuum pressure for detecting the vacuum degree inside the vacuum booster
Force snesor, the control method include:
Monitor the current working status of the vacuum pressure sensor；
According to the current working status of the vacuum pressure sensor, detect whether the vacuum pressure sensor is currently located
In electromagnetic interference state；
When the vacuum pressure sensor is in electromagnetic interference state, controls the vacuum pump and switch to immunity mode
It works；
When the vacuum pressure sensor is in non-electromagnetic interference state, controls the vacuum pump and switch to normal mode
It works.
The present invention passes through the current working status of monitoring vacuum pressure sensor, according to the work shape of vacuum pressure sensor
Whether state, detection vacuum pressure sensor are currently in electromagnetic interference state；Electromagnetic interference shape is in vacuum pressure sensor
When state, control vacuum pump switches to immunity mode and works, and weakens the influence of electromagnetic interference, is guaranteeing that operator brake helps
Power demand.
Wherein, the step of current working status of the monitoring vacuum pressure sensor includes:
Monitor the vacuum pressure sensor the detected vacuum booster vacuum degree running parameter；
Monitor the voltage value of the power supply of the vacuum pressure sensor.
Wherein, the current working status according to vacuum pressure sensor, detection vacuum pressure sensor currently whether
Include: in the step of electromagnetic interference state
When monitoring that the vacuum pump is currently at working condition, the detected vacuum of the vacuum pressure sensor institute
When the vacuum degree running parameter of booster is greater than preset range threshold value, it is determined that the vacuum pressure sensor is currently at electromagnetism
Disturbance state；Or
When monitoring that the vacuum pump is currently at off working state, the vacuum pressure sensor institute is detected true
The vacuum degree attack parameter of empty booster is greater than preset threshold, it is determined that the vacuum pressure sensor is currently at electromagnetic interference
State；Or
When the brake pedal for monitoring that the vacuum pump is currently at off working state and connect with the vacuum booster
When not receiving pressure signal, the vacuum pressure sensor detected vacuum booster vacuum degree one detection week
The number for reaching upper limit threshold and lower threshold in phase is all larger than the first preset times, it is determined that at the vacuum pressure sensor
In electromagnetic interference state；Or
When monitor the voltage value of power supply of the vacuum pressure sensor reach upper limit voltage threshold value and under ration the power supply
The number of pressure threshold value is all larger than the second preset times, it is determined that the vacuum pressure sensor is in electromagnetic interference state.
Wherein, described when monitoring that the vacuum pump is currently at working condition, the vacuum pressure sensor is detected
When the vacuum degree running parameter of the vacuum booster of acquisition is greater than preset range threshold value, it is determined that the vacuum pressure sensor is worked as
Preceding the step of being in electromagnetic interference state specifically:
When the vacuum pump is currently under working condition, the detected vacuum servo of the vacuum pressure sensor institute
The rising gradient value of the vacuum degree of device is greater than the first predetermined gradient value or vacuum pressure sensor institute is detected true
When the downward gradient value of the vacuum degree of empty booster is greater than the second predetermined gradient value, determine that the vacuum pressure sensor is currently located
In electromagnetic interference state；
Wherein the preset range threshold value includes the first predetermined gradient value and the second predetermined gradient value.
Wherein, described when the vacuum pressure sensor is in electromagnetic interference state, it controls the vacuum pump and switches to
The step of immunity mode is worked include:
Detect whether the brake pedal receives pressure signal；
When the brake pedal does not receive pressure signal, vacuum pump work in the first preset time period is controlled
Make, it is adjacent with the first preset time period, stop working in the second preset time period after the first preset time period；
When the brake pedal receives pressure signal, the vacuum pump work is controlled, until the brake pedal is examined
Third preset time period is continued for when not detecting pressure signal.
The embodiment of the present invention also provides a kind of control device of force aid system for braking, and the force aid system for braking includes vacuum
Booster, the vacuum pump being connect with the vacuum booster and the vacuum for detecting the vacuum degree inside the vacuum booster
Pressure sensor, the control device include:
Monitoring modular, for monitoring the current working status of the vacuum pressure sensor；
Detection module detects the vacuum pressure and passes for the current working status according to the vacuum pressure sensor
Whether sensor is currently in electromagnetic interference state；
First processing module, for controlling the vacuum when the vacuum pressure sensor is in electromagnetic interference state
Pump switches to immunity mode and works；
Second processing module is described true for controlling when the vacuum pressure sensor is in non-electromagnetic interference state
Sky pump switches to normal mode and works.
Wherein, the monitoring modular includes:
First monitoring submodule, for monitor the vacuum pressure sensor the detected vacuum booster
Vacuum degree running parameter；
Second monitoring submodule, the voltage value of the power supply for monitoring the vacuum pressure sensor.
Wherein, the detection module includes:
First detection sub-module monitors that the vacuum pump is currently at working condition for working as, and the vacuum pressure passes
Sensor detected vacuum booster vacuum degree running parameter be greater than preset range threshold value when, it is determined that the vacuum pressure
Force snesor is currently at electromagnetic interference state；Or
Second detection sub-module monitors that the vacuum pump is currently at off working state, the vacuum pressure for working as
Sensor the vacuum degree attack parameter of detected vacuum booster be greater than preset threshold, it is determined that the vacuum pressure passes
Sensor is currently at electromagnetic interference state；Or
Third detection sub-module, for when monitor the vacuum pump be currently at off working state and with the vacuum
When the brake pedal of booster connection does not receive pressure signal, the detected vacuum servo of the vacuum pressure sensor institute
The vacuum degree of device reaches upper limit threshold in a detection cycle and the number of lower threshold is all larger than the first preset times, it is determined that
The vacuum pressure sensor is in electromagnetic interference state；Or
4th detection sub-module, for reaching when the voltage value for the power supply for monitoring the vacuum pressure sensor
The number of voltage limit threshold value and lower threshold voltage is all larger than the second preset times, it is determined that the vacuum pressure sensor is in
Electromagnetic interference state.
Wherein, first detection sub-module is further used for:
When the vacuum pump is currently under working condition, the detected vacuum servo of the vacuum pressure sensor institute
The rising gradient value of the vacuum degree of device is greater than the first predetermined gradient value or vacuum pressure sensor institute is detected true
When the downward gradient value of the vacuum degree of empty booster is greater than the second predetermined gradient value, determine that the vacuum pressure sensor is currently located
In electromagnetic interference state；
Wherein the preset range threshold value includes the first predetermined gradient value and the second predetermined gradient value.
Wherein, the first processing module includes:
First processing submodule, for detecting whether the brake pedal receives pressure signal；
Second processing submodule, for controlling the vacuum pump and existing when the brake pedal does not receive pressure signal
Work in first preset time period, it is pre- adjacent with the first preset time period, after the first preset time period second
If stopping working in the period；
Third handles submodule, for controlling the vacuum pump work when the brake pedal receives pressure signal,
Until the brake pedal continues for third preset time period when can't detect pressure signal.
The beneficial effect of technical solution of the embodiment of the present invention includes at least:
Technical solution of the present invention is sensed by monitoring the current working status of vacuum pressure sensor according to vacuum pressure
Whether the working condition of device, detection vacuum pressure sensor are currently in electromagnetic interference state；It is in vacuum pressure sensor
When electromagnetic interference state, control vacuum pump switches to immunity mode and works, and weakens the influence of electromagnetic interference, is guaranteeing to drive
The person's of sailing brake boost demand.
Further, technical solution of the present invention can reduce vacuum pump under the premise of guaranteeing operator brake power-assisted demand
The unnecessary working time can reduce the unexpected frequent unlatching due to caused by electromagnetic interference for piston type vacuum pump,
Reduce accumulation of heat, protect the service life, provides guarantee for traffic safety.
Detailed description of the invention
Fig. 1 shows the control method schematic diagrames for the force aid system for braking that the embodiment of the present invention one provides；
Fig. 2 indicates the interior interference source of vacuum pressure sensor and the connection schematic diagram of vacuum pressure sensor；
Fig. 3 indicates force aid system for braking of embodiment of the present invention schematic diagram；
Fig. 4 indicates the control method schematic diagram of force aid system for braking provided by Embodiment 2 of the present invention；
Fig. 5 indicates the control device schematic diagram one for the force aid system for braking that the embodiment of the present invention three provides；
Fig. 6 indicates the control device schematic diagram two for the force aid system for braking that the embodiment of the present invention three provides；
Fig. 7 indicates the control device schematic diagram three for the force aid system for braking that the embodiment of the present invention three provides；
Fig. 8 shows the control device schematic diagrames four for the force aid system for braking that the embodiment of the present invention three provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, right below in conjunction with the accompanying drawings and the specific embodiments
The present invention is described in detail.
Embodiment one
As shown in Figure 1, the embodiment of the present invention one provides a kind of control method of force aid system for braking, force aid system for braking packet
Include vacuum booster, the vacuum pump connecting with vacuum booster and the vacuum pressure for detecting the vacuum degree inside vacuum booster
Force snesor, control method include:
Step 101, the current working status for monitoring vacuum pressure sensor.
Vacuum pressure sensor is located at the vacuum degree that can detecte inside vacuum booster on vacuum booster, vacuum servo
Device provides brake boost demand for driver.This programme monitors vacuum pressure sensor by the entire car controller of electric car
Current working status.Wherein, entire car controller provides power supply for vacuum pressure sensor.Entire car controller is monitoring vacuum
After the current working status of pressure sensor, step 102 is executed.
Whether step 102, the current working status according to vacuum pressure sensor, detection vacuum pressure sensor are currently located
In electromagnetic interference state.
After monitoring obtains the current working status of vacuum pressure sensor, according to the current work of vacuum pressure sensor
Make whether state-detection vacuum pressure sensor is in electromagnetic interference state.
Wherein, the interference source of vacuum pressure sensor can be divided into natural disturbance source and human interference source.Natural disturbance source is
Refer to the electromagnet phenomenon that occurs in nature and can cause electromagnetic interference；Human interference source refers to that all electromagnetism that can generate are done
The electronic electric equipment or system disturbed, as in the electromagnetic signal and power transmission line that emit when radar, radio output or
The electromagnetic signal etc. that the electric current of instantaneous variation generates in switching device.For vacuum pressure sensor, suffered by electromagnetism it is dry
The overwhelming majority is disturbed from vehicle interior, Fig. 2 is the artificial interference source of car of several interference vacuum pressure sensors.
Electric machine controller 201, power inverter 202, air-conditioning 203, charger 204, motor and 205 power electrics in Fig. 2
Pond 206 is high voltage parts, is the potential interference source of vacuum pressure sensor 200, for example, including in electric machine controller 201
High-power switch device, such as IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) work
Electromagnetic interference problem will necessarily be brought when making；When motor compressor in air-conditioning 203 works, the initial stage especially started,
It is easy to cause electromagnetic interference problem, in addition vehicle can equally cause electromagnetic interference problem when carrying out Brake energy recovery.One
As for above six high voltage parts electromagnetic interference problem is handled by various means before factory, but vehicle tool
Have the characteristic of driving cycle complexity, need consider for some reason, such as collide or aging circuit cause high voltage parts and
Vacuum pressure sensor shielded layer or ground line damage, interfere and leak, and then electromagnetic interference is caused to occur influencing vacuum pressure
The case where force snesor 200 works normally.
Detecting vacuum pressure sensor, currently whether the mode in electromagnetic interference state is main are as follows:
1, in the case where vacuum pump is in running order, the detected vacuum degree changing value of vacuum pressure sensor is greater than standard
Value, determines that vacuum pressure sensor is currently at electromagnetic interference state.
2, it in the case where vacuum pump is in off working state, when the detected vacuum degree of vacuum pressure sensor increases, determines
Vacuum pressure sensor is currently at electromagnetic interference state.
3, in the case where vacuum pump is in off working state, when the detected vacuum degree of vacuum pressure sensor jumps,
Determine that vacuum pressure sensor is currently at electromagnetic interference state.
4, in the power supply jump of vacuum pressure sensor, determine that vacuum pressure sensor is currently at electromagnetic interference
State.
When determining that vacuum pressure sensor is currently at electromagnetic interference state, step 103 is needed to be implemented, is determining vacuum
When pressure sensor is currently at non-electromagnetic interference state, step 104 is needed to be implemented.
Step 103, when vacuum pressure sensor is in electromagnetic interference state, control vacuum pump switch to immunity mode
It works.
When determining that vacuum pressure sensor is in electromagnetic interference state, needs to control vacuum pump and switch to immunity mode
It works, weakens the influence of electromagnetic interference, can guarantee the system of driver to realize that electromagnetism interference establishes solid foundation
Dynamic power-assisted demand.
Wherein after vacuum pump, which switches to immunity mode, carries out work a period of time, vacuum pressure sensing can detecte
Whether device is currently in electromagnetic interference state, when meeting following three situation simultaneously, determines that vacuum pressure sensor is in non-
Electromagnetic interference state, i.e. electromagnetic interference failure vanishes.
1, in the case where vacuum pump is in running order, the detected vacuum degree changing value of vacuum pressure sensor be less than or
Equal to standard value.
2, in the case where vacuum pump is in off working state, the detected vacuum degree of vacuum pressure sensor, which is in, stablizes shape
State.
3, the power supply of vacuum pressure sensor is stablized.
After determining electromagnetic interference failure vanishes, vacuum pressure sensor is in non-electromagnetic interference state at this time, can be with
Execute step 104.
Step 104, when vacuum pressure sensor is in non-electromagnetic interference state, control vacuum pump switch to normal mode
It works.
When vacuum pressure sensor is in non-electromagnetic interference state, entire car controller can control vacuum pump and switch to just
Norm formula works.
Wherein entire car controller is directly connected to vacuum pump.Entire car controller belongs to force aid system for braking, as shown in figure 3,
Force aid system for braking includes: vacuum booster 301, is set to vacuum pressure on vacuum booster 301, for detecting vacuum degree
Force snesor 302；Characterization vacuum servo being connect with vacuum pressure sensor 302, receiving the transmitting of vacuum pressure sensor 302
The detection signal of 301 vacuum degree of device, and the entire car controller 303 for controlling signal is generated according to detection signal；With entire car controller
303 connection, receive control signals and according to control signal enabling vacuum pump 304；And connect with vacuum pump 304, be
The vacuum tank 305 of force aid system for braking offer vacuum degree deposit.Its intermediate pump 304 is helped by two check valves 306 with vacuum
Power device 301 and vacuum tank 305 connect.Entire car controller 303 is the power supply of vacuum pressure sensor 302.
Entire car controller 303 acquires the voltage signal of vacuum pressure sensor 302 by analog-digital converter interface, by letter
Number parsing obtain 301 internal vacuum of vacuum booster；The vacuum pressure value that entire car controller 303 is obtained according to parsing, according to
Certain control logic driving vacuum pump 304 is enabled；Wherein drive the electric current of vacuum pump 304 special by 303 inside of entire car controller
The driving chip of door generates；Vacuum tank 305 and vacuum booster 301 are extracted by two check valves 306 when vacuum pump 304 works
Internal air provides vacuum degree guarantee；Vacuum tank 305 provides vacuum degree deposit for entire force aid system for braking, especially true
When sky pump 304 does not work, the vacuum degree in vacuum tank 305 can provide brake boost demand for driver.
In the present invention, vehicle control according to normal mode while carrying out fault detection after powering on to vacuum pump；Work as inspection
It measures and then enters electromagnetism interference vacuum pump control model after electromagnetic interference failure occurs, helped with weakening electromagnetic interference to braking
The influence of Force system；Failure is monitored after electromagnetic interference failure occurs, restores vacuum pump if failure vanishes to normal control
Otherwise molding formula persistently controls vacuum pump using electromagnetism interference control method.
The embodiment of the present invention one is sensed by monitoring the current working status of vacuum pressure sensor according to vacuum pressure
Whether the working condition of device, detection vacuum pressure sensor are currently in electromagnetic interference state；It is in vacuum pressure sensor
When electromagnetic interference state, control vacuum pump switches to immunity mode and works, and can weaken the influence of electromagnetic interference, protect
Demonstrate,prove operator brake power-assisted demand.It is unnecessary that vacuum pump can be reduced under the premise of guaranteeing operator brake power-assisted demand simultaneously
Working time can be reduced by the unexpected frequent unlatching due to caused by electromagnetic interference, reduced for piston type vacuum pump
Accumulation of heat protects the service life, provides guarantee for traffic safety.
Embodiment two
As shown in figure 4, second embodiment of the present invention provides a kind of control method of force aid system for braking, force aid system for braking packet
Include vacuum booster, the vacuum pump connecting with vacuum booster and the vacuum pressure for detecting the vacuum degree inside vacuum booster
Force snesor, control method include:
Step 401, monitoring vacuum pressure sensor detected vacuum booster vacuum degree running parameter.
Vacuum pressure sensor is located on vacuum booster, and vacuum booster is controlled to a vacuum pump, and vacuum booster can
To provide brake boost demand for driver, vacuum pressure sensor detection obtains the vacuum degree running parameter of vacuum booster,
This programme monitors the vacuum degree running parameter of the vacuum booster of vacuum pressure sensor acquisition by entire car controller.Its
In, entire car controller provides power supply for vacuum pressure sensor.
Step 402, monitor vacuum pressure sensor power supply voltage value.
Entire car controller is also needed when monitoring the vacuum degree running parameter for the vacuum booster that vacuum pressure sensor obtains
The voltage value for monitoring the power supply of vacuum pressure sensor, in the vacuum booster for monitoring that vacuum pressure sensor obtains
Vacuum degree running parameter and vacuum pressure sensor power supply voltage value after, execute step 403.
Step 403, according to vacuum pressure sensor detected vacuum booster vacuum degree running parameter, vacuum
Whether the voltage value detection vacuum pressure sensor of the power supply of pressure sensor is currently in electromagnetic interference state.
Monitor the process whether vacuum pressure sensor is currently in electromagnetic interference state are as follows:
When monitoring that vacuum pump is currently at working condition, vacuum pressure sensor detected vacuum booster
When vacuum degree running parameter is greater than preset range threshold value, it is determined that vacuum pressure sensor is currently at electromagnetic interference state；Or
Person
When monitoring that vacuum pump is currently at off working state, the detected vacuum booster of vacuum pressure sensor institute
Vacuum degree attack parameter be greater than preset threshold, it is determined that vacuum pressure sensor is currently at electromagnetic interference state；Or
When monitoring that vacuum pump is currently at off working state and the brake pedal connecting with vacuum booster does not receive
When pressure signal, vacuum pressure sensor the vacuum degree of detected vacuum booster reach the upper limit in a detection cycle
The number of threshold value and lower threshold is all larger than the first preset times, it is determined that vacuum pressure sensor is in electromagnetic interference state；
Or
When the voltage value for the power supply for monitoring vacuum pressure sensor reaches upper limit voltage threshold value and lower voltage limit threshold
The number of value is all larger than the second preset times, it is determined that vacuum pressure sensor is in electromagnetic interference state.
Wherein, in running order in vacuum pump, vacuum pressure sensor detected vacuum booster vacuum
When spending running parameter greater than preset range threshold value, it is determined that vacuum pressure sensor is currently at the process of electromagnetic interference state
Are as follows: when vacuum pump is currently under working condition, vacuum pressure sensor the vacuum degree of detected vacuum booster
Rising gradient value be greater than the first predetermined gradient value or vacuum pressure sensor detected vacuum booster vacuum degree
Downward gradient value be greater than the second predetermined gradient value when, determine that vacuum pressure sensor is currently at electromagnetic interference state, otherwise
Determine that vacuum pressure sensor is currently at non-electromagnetic interference state；Wherein preset range threshold value include the first predetermined gradient value and
Second predetermined gradient value.
Specifically, in vacuum pump work, and in the case where not stepping on the brake pedal connecting with vacuum booster, braking
Vacuum degree rising inside force aid system does not exceed certain gradient (related to vacuum pump vacuum capability), enables the gradient be
First predetermined gradient value Grad1, while the decline of vacuum degree will not be greater than another gradient, enabling the gradient is the second predetermined gradient
Value Grad2 (gradient is maximum when vacuum booster moment breakage)；It is monitored by the variation to vacuum degree (regardless of whether stepping on system
Dynamic pedal), when vacuum degree rising gradient is greater than the first predetermined gradient value Grad1 or downward gradient greater than the second predetermined gradient value
When Grad2, then it is assumed that vacuum pressure sensor is now in electromagnetic interference state by electromagnetic interference, otherwise determines vacuum pressure
Force snesor is currently at non-electromagnetic interference state.
Wherein, when monitoring that vacuum pump is currently at off working state, the detected vacuum of vacuum pressure sensor institute
The vacuum degree attack parameter of booster is greater than preset threshold, it is determined that vacuum pressure sensor is currently at electromagnetic interference state
Detailed process are as follows: in vacuum air pump inoperative, regardless of whether brake pedal is stepped on, if vacuum degree is increased beyond preset threshold Vac1
(preset threshold includes influence of the factors such as temperature and sensor drift to vacuum degree), then it is assumed that vacuum pressure sensor by
To electromagnetic interference, it is now in electromagnetic interference state, otherwise determines that vacuum pressure sensor is currently at non-electromagnetic interference state.
Wherein, when monitor vacuum pump be currently at off working state and the brake pedal that is connect with vacuum booster not
When receiving pressure signal, vacuum pressure sensor the vacuum degree of detected vacuum booster reached in a detection cycle
Number to upper limit threshold and lower threshold is all larger than the first preset times, it is determined that vacuum pressure sensor is in electromagnetic interference
The detailed process of state are as follows: in vacuum air pump inoperative and under conditions of do not step on brake pedal, vacuum degree should keep stable, if at this time
Vacuum degree jumps, i.e., in a detection cycle, vacuum degree respectively reaches defined upper limit threshold VacHi and lower threshold
At VacLo each N1 times or more, then it is assumed that otherwise vacuum pressure sensor is determined that vacuum pressure sensor is current by electromagnetic interference
In non-electromagnetic interference state.Wherein for times N 1 for the first preset times and more than or equal to 2, its object is to filter out due to being
Failure caused by actual leakage of uniting is judged by accident.Pressure sensor is provided on brake pedal, the generation when there is pressure on brake pedal
Signal, and send the signal to entire car controller.
Wherein, the voltage value for the power supply for monitoring vacuum pressure sensor reach upper limit voltage threshold value and under ration the power supply
The number of pressure threshold value is all larger than the second preset times, it is determined that vacuum pressure sensor is in the process of electromagnetic interference state are as follows:
The power supply for detecting vacuum pressure sensor, when detecting that it respectively reaches set upper limit voltage threshold VHi and lower voltage limit
At threshold value VLo each N2 times or more, then it is assumed that otherwise vacuum pressure sensor is determined that vacuum pressure sensor is worked as by electromagnetic interference
It is preceding to be in non-electromagnetic interference state.Wherein times N 2 is the second preset times.
Step 404 is executed when vacuum pressure sensor is currently at electromagnetic interference state, is worked as in vacuum pressure sensor
It is preceding be in non-electromagnetic interference state when execute step 407.
Step 404, when vacuum pressure sensor is in electromagnetic interference state, detection brake pedal whether receive pressure
Signal.
When determining that vacuum pressure sensor is in electromagnetic interference state, need to detect whether brake pedal receives pressure
Signal is wherein provided with pressure sensor on brake pedal, pressure sensor is connect with entire car controller, has on brake pedal
Pressure sensor can generate signal when pressure, and send the signal to entire car controller.Determining that brake pedal do not receive pressure
Step 405 is executed when force signal, and step 406 is executed when brake pedal receives pressure signal.
Step 405, when brake pedal does not receive pressure signal, control vacuum pump work in the first preset time period
Make, it is adjacent with the first preset time period, stop working in the second preset time period after the first preset time period.
If brake pedal is not operated, i.e., when brake pedal does not receive pressure signal, then interval control is carried out to vacuum pump
System, so that closing after vacuum pump every work Tn seconds To seconds, wherein Tn seconds are the first preset time period, and To seconds are the second preset time
Section.Using tapping mode due to joined forcibly close vacuum pump link, can alleviate piston type vacuum pump due to it is long when
Between work caused by problems of excessive heat, while the vacuum degree inside force aid system for braking can be guaranteed by discontinuous operation, met
The brake boost demand of driver can detecte the recovery condition of electromagnetic interference failure in addition within the Tn second of work, if meeting
Recovery condition then jumps out antidisturbance control mode, into normal control mode.
Step 406, when brake pedal receives pressure signal, control vacuum pump work, until brake pedal detection not
Third preset time period is continued for when to pressure signal.
If brake pedal is operated, vacuum pump is controlled according to brake signal, is specially made after brake pedal is operated
Energy vacuum pump, the Ts second after brake pedal is released, wherein Ts seconds are third preset time period.It can guarantee within Ts seconds true
Vacuum degree inside force aid system for braking is extracted into vacuum pump from 0 and closes the time required for pressure value by sky pump.The pass of vacuum pump
Closing pressure value is a specified value, and the pressure in vacuum pump needs to be greater than 70 kPas at this time.This method can guarantee driver's system
The vacuum pump unnecessary working time is reduced under the premise of dynamic power-assisted demand, its accumulation of heat is reduced, protects its service life.
After electromagnetic interference failure occurs, driver can be prompted by braking system faults lamp, alarm sound, be mentioned
High travel safety.
Step 407, when vacuum pressure sensor is in non-electromagnetic interference state, control vacuum pump switch to normal mode
It works.
When vacuum pressure sensor is in non-electromagnetic interference state, entire car controller can control vacuum pump and switch to just
Norm formula works.
It should be noted that.When following three conditions all meet, electromagnetic interference fault recovery is determined, at this time vehicle control
Device processed, which also can control vacuum pump and switch to normal mode, to work.
1, vacuum degree under conditions of vacuum pump is in running order and does not step on brake pedal, inside force aid system for braking
Variation is normal, i.e., the gradient of vacuum degree rising is within prescribed limit [GradLo, GradHi].
2, under conditions of vacuum pump closes and do not step on brake pedal, the variation of force aid system for braking internal vacuum is no more than
± Vac, wherein change threshold Vac includes influence of the factors such as temperature and sensor drift to vacuum degree.
3, within the limits prescribed, wherein upper limit voltage threshold value is VHi, lower voltage limit to vacuum pressure sensor supply voltage
Threshold value is VLo.
In the present invention, the change of signal intensity and vacuum pressure sensor power supply by monitoring vacuum pressure sensor
Change and initiative recognition is carried out to electromagnetic interference, pro-active intervention strategically is carried out to the work of vacuum pump on this basis, weakens
The influence of electromagnetic interference not only protects vacuum pump under the premise of guaranteeing operator brake power-assisted demand, while being driving peace
Guarantee is provided entirely.
The embodiment of the present invention two is sensed by monitoring the current working status of vacuum pressure sensor according to vacuum pressure
Whether the working condition of device, detection vacuum pressure sensor are currently in electromagnetic interference state；It is in vacuum pressure sensor
When electromagnetic interference state, control vacuum pump switches to immunity mode and works, and can weaken the influence of electromagnetic interference, protect
Demonstrate,prove operator brake power-assisted demand.It is unnecessary that vacuum pump can be reduced under the premise of guaranteeing operator brake power-assisted demand simultaneously
Working time can be reduced by the unexpected frequent unlatching due to caused by electromagnetic interference, reduced for piston type vacuum pump
Accumulation of heat protects the service life, provides guarantee for traffic safety.
Embodiment three
The embodiment of the present invention three provides a kind of control device of force aid system for braking, and force aid system for braking includes vacuum servo
Device, the vacuum pump being connect with vacuum booster and the vacuum pressure sensor for detecting the vacuum degree inside vacuum booster,
As shown in figure 5, control device includes:
Monitoring modular 10, for monitoring the current working status of vacuum pressure sensor；
Detection module 20 detects vacuum pressure sensor and works as the current working status according to vacuum pressure sensor
It is preceding whether to be in electromagnetic interference state；
First processing module 30, for when vacuum pressure sensor is in electromagnetic interference state, control vacuum pump to switch
It works to immunity mode；
Second processing module 40, for when vacuum pressure sensor is in non-electromagnetic interference state, control vacuum pump to be cut
Normal mode is shifted to work.
Wherein, as shown in fig. 6, monitoring modular 10 includes:
First monitoring submodule 11, for monitor vacuum pressure sensor detected vacuum booster vacuum degree
Running parameter；
Second monitoring submodule 12, the voltage value of the power supply for monitoring vacuum pressure sensor.
Wherein, as shown in fig. 7, detection module 20 includes:
First detection sub-module 21 monitors that vacuum pump is currently at working condition, vacuum pressure sensor institute for working as
When the vacuum degree running parameter of detected vacuum booster is greater than preset range threshold value, it is determined that vacuum pressure sensor is worked as
It is preceding to be in electromagnetic interference state；Or
Second detection sub-module 22 monitors that vacuum pump is currently at off working state, vacuum pressure sensor for working as
Detected vacuum booster vacuum degree attack parameter be greater than preset threshold, it is determined that vacuum pressure sensor is currently located
In electromagnetic interference state；Or
Third detection sub-module 23 monitors that vacuum pump is currently at off working state and and vacuum booster for working as
When the brake pedal of connection does not receive pressure signal, vacuum pressure sensor detected vacuum booster vacuum degree
The number for reaching upper limit threshold and lower threshold in a detection cycle is all larger than or is equal to the first preset times, it is determined that true
Pneumatics force snesor is in electromagnetic interference state；Or
4th detection sub-module 24, for reaching the upper limit when the voltage value for the power supply for monitoring vacuum pressure sensor
The number of voltage threshold and lower threshold voltage is all larger than or is equal to the second preset times, it is determined that at vacuum pressure sensor
In electromagnetic interference state.
Wherein, the first detection sub-module 21 is further used for:
When vacuum pump is currently under working condition, vacuum pressure sensor detected vacuum booster vacuum
The rising gradient value of degree be greater than the first predetermined gradient value or vacuum pressure sensor detected vacuum booster it is true
When the downward gradient value of reciprocal of duty cycle is greater than the second predetermined gradient value, determine that vacuum pressure sensor is currently at electromagnetic interference state；
Wherein preset range threshold value includes the first predetermined gradient value and the second predetermined gradient value.
Wherein, as shown in figure 8, first processing module 30 includes:
First processing submodule 31, for detecting whether brake pedal receives pressure signal；
Second processing submodule 32, for when brake pedal does not receive pressure signal, control vacuum pump to be pre- first
If work in the period, in the second preset time adjacent with the first preset time period, after the first preset time period
It stops working in section；
Third handles submodule 33, for controlling vacuum pump work when brake pedal receives pressure signal, until system
Dynamic pedal continues for third preset time period when can't detect pressure signal.
The embodiment of the present invention three, by the current working status of above-mentioned module monitors vacuum pressure sensor, according to vacuum
Whether the working condition of pressure sensor, detection vacuum pressure sensor are currently in electromagnetic interference state；It is passed in vacuum pressure
When sensor is in electromagnetic interference state, control vacuum pump switches to immunity mode and works, and can weaken electromagnetic interference
It influences, is guaranteeing operator brake power-assisted demand.It can be reduced under the premise of guaranteeing operator brake power-assisted demand simultaneously true
Sky pumps the unnecessary working time, for piston type vacuum pump, can reduce unexpected frequent due to caused by electromagnetic interference
It opens, reduces accumulation of heat, protect the service life, provide guarantee for traffic safety.
It should be noted that the control device of force aid system for braking provided in an embodiment of the present invention is using the above method
Device, then all embodiments of the above method are suitable for the device, and can reach the same or similar beneficial effect.
Further, the embodiment of the present invention also provides a kind of electric car, which includes force aid system for braking, adopts
The control method of the force aid system for braking described in embodiment one and embodiment two controls vacuum pump switching working mode, weakens electricity
The influence of magnetic disturbance.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come
It says, can also make several improvements and retouch under the premise of not departing from principle of the present invention, these improvements and modifications also exist
In protection scope of the present invention.
Claims (8)
1. a kind of control method of force aid system for braking, the force aid system for braking includes vacuum booster, helps with the vacuum
The vacuum pump that power device connects and the vacuum pressure sensor for detecting the vacuum degree inside the vacuum booster, feature exist
In the control method includes:
The current working status for monitoring the vacuum pressure sensor, including: it monitors the vacuum pressure sensor and is examined
The vacuum degree running parameter of the vacuum booster obtained is surveyed, and, monitor the power supply of the vacuum pressure sensor
Voltage value；
According to the current working status of the vacuum pressure sensor, whether the vacuum pressure sensor is detected currently in electricity
Magnetic disturbance state；
When the vacuum pressure sensor is in electromagnetic interference state, controls the vacuum pump and switch to immunity mode progress
Work；
When the vacuum pressure sensor is in non-electromagnetic interference state, controls the vacuum pump and switch to normal mode progress
Work.
2. the method according to claim 1, wherein the work at present according to the vacuum pressure sensor
State detects that the step of whether vacuum pressure sensor is currently in electromagnetic interference state includes:
When monitoring that the vacuum pump is currently at working condition, the detected vacuum servo of the vacuum pressure sensor institute
When the vacuum degree running parameter of device is greater than preset range threshold value, it is determined that the vacuum pressure sensor is currently at electromagnetic interference
State；Or
When monitoring that the vacuum pump is currently at off working state, the detected vacuum of the vacuum pressure sensor institute is helped
The vacuum degree attack parameter of power device is greater than preset threshold, it is determined that the vacuum pressure sensor is currently at electromagnetic interference shape
State；Or
When monitoring that the vacuum pump is currently at off working state and the brake pedal connecting with the vacuum booster does not connect
When receiving pressure signal, the vacuum pressure sensor detected vacuum booster vacuum degree in a detection cycle
The number for reaching upper limit threshold and lower threshold is all larger than the first preset times, it is determined that the vacuum pressure sensor is in electricity
Magnetic disturbance state；Or
When the voltage value for the power supply for monitoring the vacuum pressure sensor reaches upper limit voltage threshold value and lower voltage limit threshold
The number of value is all larger than the second preset times, it is determined that the vacuum pressure sensor is in electromagnetic interference state.
3. according to the method described in claim 2, it is characterized in that, described ought monitor that the vacuum pump is currently at work shape
State, the vacuum pressure sensor detected vacuum booster vacuum degree running parameter be greater than preset range threshold value
When, it is determined that the vacuum pressure sensor is currently at the step of electromagnetic interference state specifically:
When the vacuum pump is currently under working condition, the vacuum pressure sensor detected vacuum booster
The rising gradient value of vacuum degree is greater than the detected vacuum of the first predetermined gradient value or vacuum pressure sensor institute and helps
When the downward gradient value of the vacuum degree of power device is greater than the second predetermined gradient value, determine that the vacuum pressure sensor is currently at electricity
Magnetic disturbance state；
Wherein the preset range threshold value includes the first predetermined gradient value and the second predetermined gradient value.
4. according to the method described in claim 2, it is characterized in that, described be in electromagnetic interference in the vacuum pressure sensor
When state, controls the vacuum pump and switch to the step of immunity mode is worked and include:
Detect whether the brake pedal receives pressure signal；
When the brake pedal does not receive pressure signal, controls the vacuum pump and work in the first preset time period,
It is adjacent with the first preset time period, stop working in the second preset time period after the first preset time period；
When the brake pedal receives pressure signal, the vacuum pump work is controlled, until brake pedal detection is not
Third preset time period is continued for when to pressure signal.
5. a kind of control device of force aid system for braking, the force aid system for braking includes vacuum booster, helps with the vacuum
The vacuum pump that power device connects and the vacuum pressure sensor for detecting the vacuum degree inside the vacuum booster, feature exist
In the control device includes:
Monitoring modular, for monitoring the current working status of the vacuum pressure sensor, including: the first monitoring submodule
Block, for monitor the vacuum pressure sensor the detected vacuum booster vacuum degree running parameter, and,
Second monitoring submodule, the voltage value of the power supply for monitoring the vacuum pressure sensor；
Detection module detects the vacuum pressure sensor for the current working status according to the vacuum pressure sensor
It is current whether to be in electromagnetic interference state；
First processing module, for controlling the vacuum pump and cutting when the vacuum pressure sensor is in electromagnetic interference state
Immunity mode is shifted to work；
Second processing module, for controlling the vacuum pump when the vacuum pressure sensor is in non-electromagnetic interference state
Normal mode is switched to work.
6. device according to claim 5, which is characterized in that the detection module includes:
First detection sub-module monitors that the vacuum pump is currently at working condition, the vacuum pressure sensor for working as
The vacuum degree running parameter of detected vacuum booster when being greater than preset range threshold value, it is determined that the vacuum pressure passes
Sensor is currently at electromagnetic interference state；Or
Second detection sub-module monitors that the vacuum pump is currently at off working state, the vacuum pressure sensing for working as
Device detected vacuum booster vacuum degree attack parameter be greater than preset threshold, it is determined that the vacuum pressure sensor
It is currently at electromagnetic interference state；Or
Third detection sub-module, for when monitor the vacuum pump be currently at off working state and with the vacuum servo
The brake pedal of device connection is not when receiving pressure signal, the vacuum pressure sensor detected vacuum booster
Vacuum degree reaches upper limit threshold in a detection cycle and the number of lower threshold is all larger than the first preset times, it is determined that described
Vacuum pressure sensor is in electromagnetic interference state；Or the 4th detection sub-module, for when monitoring that the vacuum pressure passes
The voltage value of the power supply of sensor reaches upper limit voltage threshold value and the number of lower threshold voltage is all larger than the second preset times,
Then determine that the vacuum pressure sensor is in electromagnetic interference state.
7. device according to claim 6, which is characterized in that first detection sub-module is further used for:
When the vacuum pump is currently under working condition, the vacuum pressure sensor detected vacuum booster
The rising gradient value of vacuum degree is greater than the detected vacuum of the first predetermined gradient value or vacuum pressure sensor institute and helps
When the downward gradient value of the vacuum degree of power device is greater than the second predetermined gradient value, determine that the vacuum pressure sensor is currently at electricity
Magnetic disturbance state；
Wherein the preset range threshold value includes the first predetermined gradient value and the second predetermined gradient value.
8. device according to claim 6, which is characterized in that the first processing module includes:
First processing submodule, for detecting whether the brake pedal receives pressure signal；
Second processing submodule, for controlling the vacuum pump first when the brake pedal does not receive pressure signal
Work in preset time period, it is adjacent with the first preset time period, after the first preset time period second it is default when
Between stop working in section；
Third handles submodule, for controlling the vacuum pump work when the brake pedal receives pressure signal, until
The brake pedal continues for third preset time period when can't detect pressure signal.
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| CN107472228B (en) * | 2017-07-31 | 2020-02-18 | 北京新能源汽车股份有限公司 | Vacuum pump control method and device and automobile |
| CN107554509B (en) * | 2017-08-25 | 2019-11-22 | 北京新能源汽车股份有限公司 | Method of controlling security, system and the new-energy automobile of vacuum pump |
| CN107697054B (en) * | 2017-09-18 | 2019-08-16 | 北京长城华冠汽车科技股份有限公司 | A kind of modification method and device of vacuum servo parameter |
| CN109696859B (en) * | 2017-10-24 | 2021-03-19 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device for weighing cooking appliance and cooking appliance |
| CN107933540A (en) * | 2017-12-22 | 2018-04-20 | 温州瓯云科技有限公司 | A kind of electronic type vacuum pressure controller |
| KR102529443B1 (en) * | 2018-04-05 | 2023-05-08 | 현대자동차주식회사 | Method and apparatus for verifying normal operation of brake booster vacuum pressure sensor |
| CN110654360B (en) * | 2018-06-28 | 2021-06-22 | 长城汽车股份有限公司 | Electronic vacuum pump control method, device, system and machine readable storage medium |
| CN109823328A (en) * | 2019-01-25 | 2019-05-31 | 重庆长安汽车股份有限公司 | The control method and computer readable storage medium of electronic vacuum pump |
| CN115306700B (en) * | 2022-08-16 | 2023-08-22 | 江苏汉华热管理科技有限公司 | Online monitoring system for working condition of vacuum pump for exhaust emission of carbonization furnace |
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