Summary of the invention
The utility model provides a kind of safe and reliable pure electric automobile electric vacuum booster brake control system, guarantees sensitivity and the reliability of pure electric automobile brake, guarantees to greatest extent the traffic safety of pure electric automobile.
The technical solution of the utility model is specially:
Described pure electric automobile electric vacuum booster brake control system comprises: vacuum pump, vacuum gas tank, servo-unit master cylinder assembly, brake pedal, brake fluid line, storage tanker, pressure sensor, vacuum servo braking control device.
Described pressure sensor is positioned on the vacuum gas tank, for detection of the vacuum pressure value in vacuum gas tank size and feed back to the vacuum servo braking control device;
Described servo-unit master cylinder assembly and brake pedal form connecting rod mechanism, are used to the brake pedal braking that power-assisted is provided;
Described servo-unit master cylinder assembly is communicated with by vacuum line with the vacuum gas tank;
Described vacuum gas tank is communicated with by vacuum line with vacuum pump;
Described vacuum servo braking control device is electrically connected with described vacuum pump and pressure sensor, be used for to receive the electric signal of the vacuum pressure value size that the pressure sensor on the vacuum gas tank detects, and this electric signal processed rear output control signal to vacuum pump, with the open and close of control vacuum pump;
Fluid in the storage tanker that described servo-unit master cylinder assembly connects flows to the wheel cylinder via brake fluid line, to carry out drag;
Further described vacuum servo braking control device comprises:
Power supply protection and filtration module are used for power supply is carried out reverse connecting protection and carries out filtering;
Signal receiving module is for the electric signal of the vacuum pressure value that receives described pressure sensor feedback;
The threshold voltage module be used for to be set the threshold voltage that the electric signal with pressure sensor feedback vacuum pressure value compares;
Voltage comparison module is used for the threshold voltage that the received electric signal of signal receiving module and threshold voltage module set is compared, and comparative result is exported to signal output module;
Signal output module is used for the comparative result of described voltage comparison module output is exported to vacuum pump and according to the open and close of comparative result control vacuum pump.
Further described threshold voltage can be revised setting.
Further described threshold voltage is set as half of power line voltage.
Further described vacuum servo braking control device also comprises delay circuit module, carries out time-delay closing when voltage is closed for signal output module is controlled.
The further described time-delay closing time is 15 seconds.
The working process of this pure electric automobile electric vacuum booster brake control system is: this pure electric automobile electric vacuum booster brake control system forms main control loop with vacuum servo braking control device and pressure sensor, system's vacuum servo braking control device that powers on detect to receive the electric signal of pressure sensor atmospheric pressure value size, if vacuum pressure does not reach setting value in the vacuum gas tank, the pressure sensor output low level, the vacuum servo braking control device detects low level, the vacuum servo braking control device will be controlled vacuum pump and open, if vacuum pressure is to reach setting value in the vacuum gas tank, pressure sensor output high level, the vacuum servo braking control device detects high level, the vacuum servo braking control device will be controlled the vacuum pump delay working regular hour and just close, to guarantee that vacuum pressure is enough in the vacuum gas tank, guarantee the normal operation of pure electric automobile brake vacuum assist control system.
The beneficial effects of the utility model are: employing brake power assist controller is controlled the startup of vacuum pump and is closed, guarantee the vacuum pressure of vacuum gas tank in the brake vacuum assist control system with this, effectively guarantee sensitivity and the reliability of pure electric automobile braking vacuum booster device, guaranteed to greatest extent traffic safety.
The specific embodiment
The utility model provides a kind of safe and reliable pure electric automobile electric vacuum booster brake control system, guarantees sensitivity and the reliability of pure electric automobile brake, guarantees to greatest extent the traffic safety of pure electric automobile.
The technical solution of the utility model is specially:
Described pure electric automobile electric vacuum booster brake control system comprises: vacuum pump, vacuum gas tank, servo-unit master cylinder assembly, brake pedal, brake fluid line, storage tanker, pressure sensor, vacuum servo braking control device.
Described pressure sensor is positioned on the vacuum gas tank, for detection of the vacuum pressure value in vacuum gas tank size and feed back to the vacuum servo braking control device;
Described servo-unit master cylinder assembly and brake pedal form connecting rod mechanism, are used to the brake pedal braking that power-assisted is provided;
Described servo-unit master cylinder assembly is communicated with by vacuum line with the vacuum gas tank;
Described vacuum gas tank is communicated with by vacuum line with vacuum pump;
Described vacuum servo braking control device is electrically connected with described vacuum pump and pressure sensor, be used for to receive the electric signal of the vacuum pressure value size that the pressure sensor on the vacuum gas tank detects, and this electric signal processed rear output control signal to vacuum pump, with the open and close of control vacuum pump;
Fluid in the storage tanker that described servo-unit master cylinder assembly connects flows to the wheel cylinder via brake fluid line, to carry out drag;
Further described vacuum servo braking control device comprises:
Power supply protection and filtration module are used for power supply is carried out reverse connecting protection and carries out filtering;
Signal receiving module is for the electric signal of the vacuum pressure value that receives described pressure sensor feedback;
The threshold voltage module be used for to be set the threshold voltage that the electric signal with pressure sensor feedback vacuum pressure value compares;
Voltage comparison module is used for the threshold voltage that the received electric signal of signal receiving module and threshold voltage module set is compared, and comparative result is exported to signal output module;
Signal output module is used for the comparative result of described voltage comparison module output is exported to vacuum pump and according to the open and close of comparative result control vacuum pump.
Further described threshold voltage can be revised setting.
Further described threshold voltage is set as half of power line voltage.
Further described vacuum servo braking control device also comprises delay circuit module, carries out time-delay closing when voltage is closed for signal output module is controlled.
The working process of this pure electric automobile electric vacuum booster brake control system is: this pure electric automobile electric vacuum booster brake control system forms main control loop with vacuum servo braking control device 8 and pressure sensor 7, power on vacuum servo braking control device 8 of system detects the electric signal that receives pressure sensors 7 atmospheric pressure value sizes, if vacuum pressure does not reach setting value in the vacuum gas tank 2, pressure sensor 7 output low levels, vacuum servo braking control device 8 detects low level, vacuum servo braking control device 8 will be controlled vacuum pump 1 and open, if vacuum pressure is to reach setting value in the vacuum gas tank 2, pressure sensor 7 output high level, vacuum servo braking control device 8 detects high level, vacuum servo braking control device 8 will be controlled the 1 delay working regular hour of vacuum pump and just close, to guarantee that vacuum pressure is enough in the vacuum gas tank 2, guarantee the normal operation of pure electric automobile brake vacuum assist control system.
Embodiment one:
Pure electric automobile brake assisted control system comprises as described in Figure 1: 1 vacuum pump, 2 vacuum gas tanks, 3 servo-unit master cylinder assemblies, 4 brake pedals, 5 brake fluid lines, 6 storage tankers, 7 pressure sensors, 8 vacuum servo braking control devices.Servo-unit master cylinder assembly 3 forms connecting rod mechanism with brake pedal 4, be used to brake pedal 4 that power-assisted is provided, servo-unit master cylinder assembly 3 is communicated to vacuum gas tank 2 by vacuum line, this vacuum gas tank 2 is communicated to vacuum pump 1 via vacuum line again, be provided with pressure sensor 7 on the vacuum gas tank 2, vacuum servo braking control device 8 is electrically connected with pressure sensor 7 and vacuum pump 1, be used for detecting by pressure sensor 7 size of vacuum gas tank 2 vacuum pressure values, and then control the open and close of vacuum pumps 1 by vacuum servo braking control device 8.Servo-unit master cylinder assembly 3 is connected with storage tanker 6 pipelines, and its joining place has rubber diaphragm, and the fluid in the storage tanker 6 that servo-unit master cylinder assembly 3 connects is transported to the wheel cylinder via brake fluid line 5, reaches thus the purpose of drag.
This pure electric automobile electric vacuum booster brake control system forms main control loop with vacuum servo braking control device 8 and pressure sensor 7, power on vacuum servo braking control device 8 of system detects the electric signal that receives pressure sensors 7 atmospheric pressure value sizes, if vacuum pressure does not reach setting value in the vacuum gas tank 2, pressure sensor 7 output low levels, vacuum servo braking control device 8 detects low level, vacuum servo braking control device 8 will be controlled vacuum pump 1 and open, if vacuum pressure is to reach setting value in the vacuum gas tank 2, pressure sensor 7 output high level, vacuum servo braking control device 8 detects high level, work was just closed in 15 seconds when vacuum servo braking control device 8 will be controlled vacuum pump 1 court of a feudal ruler, to guarantee that vacuum pressure is enough in the vacuum gas tank 2, guarantee the normal operation of pure electric automobile brake vacuum assist control system.
Embodiment two:
The vacuum servo braking control device principle schematic that provides for the utility model such as Fig. 2.
R1 among Fig. 2, R2, R3, R3, R4, R5, R6, R7, R8, R9 represent resistance, C1, C2, C3 represent electric capacity, EC1, EC2, EC3 represent chemical capacitor, and RW1 represents adjustable resistance, and D1, D2 represent diode, Q1 represents metal-oxide-semiconductor, IC1A, IC1B represent comparator, and VCC represents power input, and VIN represents signal input part, GND represents ground terminal, and OUT represents mouth.
This hardware control circuit comprises as shown in the figure; power supply reverse connecting protection and power filter that D1, EC1, C1 form; R1, R8, EC3, C3 provide the comparative voltage threshold values of comparator IC1A; described threshold voltage scope can be set as the case may be; under the preferable case; described threshold voltage is half of power supply voltage, and the negative input end (P2) as described hardware control circuit of described IC1A comparator is used for access from pressure sensor
![Figure DEST_PATH_DEST_PATH_IMAGE001](https://patentimages.storage.***apis.com/89/84/12/69da5ca0a52e29/DEST_PATH_DEST_PATH_IMAGE001.png)
The electric signal of expression atmospheric pressure value size, electric signal and the predefined threshold voltage of the expression atmospheric pressure value size that receives compared.When comparative result is the magnitude of voltage of the electric signal that receives during less than predefined threshold voltage, comparator IC1A port outputs a control signal to vacuum pump 1 through R7 control Q1, opens vacuum pump 1.When comparative result is the magnitude of voltage of the electric signal that receives during greater than predefined threshold voltage, comparator IC1A port outputs a control signal to vacuum pump 1 through R7 control Q1, closes vacuum pump 1.RW1, R9, EC2, C2 form circuit when closing the court of a feudal ruler of vacuum pump 1, and described time delay circuit delay time can be set as the case may be, and under the preferable case, described time delay circuit delay adjustments is 15 seconds.
Although reference example and accompanying drawing; pure electric automobile electric vacuum booster brake control system of the present utility model is illustrated; but above-mentioned disclosed content only is in order better to understand the utility model; rather than limit by any way the scope of claim; so all according to the described structure of the utility model patent claim, feature and principle do etc. change or modify, be included in protection domain of the present utility model.