CN104458276A

CN104458276A - Performance test method of hydraulic control unit of car brake system

Info

Publication number: CN104458276A
Application number: CN201410697107.6A
Authority: CN
Inventors: 李晨风; 李亮; 赵洵; 高祥; 李辉; 宋健
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2015-03-25
Anticipated expiration: 2034-11-26
Also published as: CN104458276B

Abstract

The invention relates to a performance test method of a hydraulic control unit of a car brake system. The performance test method includes the following steps that a performance test system of the hydraulic control unit of the car brake system is arranged, the performance test system comprises a pressure boosting device, a hydraulic pipeline system, a control measurement device and an environment simulation device, the pressure boosting device comprises an oil tank, a variable pump, a pressure-stabilization energy accumulator, a servo proportional valve, a first pneumatic ball valve and a second pneumatic ball valve, the hydraulic pipeline system comprises a first simulation main cylinder, a second simulation main cylinder, a first oil can, a second oil can, pneumatic ball valves from the third one to the twelfth one, the hydraulic control unit, hydraulic steel cylinders from the first one to the fourth one and an exhaust constant displacement pump, and the control measurement device comprises an industrial personal computer and a sensor. The flow and active pressure boosting performance of a plunger pump in the hydraulic control unit under different back pressure, pressure and temperature are tested. The sealing performance and response time of an electromagnetic valve in the hydraulic control unit are tested. The volume of an energy accumulator in the hydraulic control unit is tested.

Description

The performance test methods of hydraulic control unit in a kind of brake system of car

Technical field

The present invention relates to the performance test methods of parts in a kind of brake system of car, particularly about the performance test methods of hydraulic control unit in a kind of brake system of car.

Background technology

Current passenger car generally equips brake fluid system, special in the automobile being equipped with electronic stability controlling system (ESC) and tire anti-blocking brake system (ABS), hydraulic control unit (HCU) is the topmost function executor of its brake system.Hydraulic control unit is assembled by high-speed switch electromagnetic valve, ram pump and accumulator etc. and forms.Wherein, the volume etc. of the response performance of high-speed switch electromagnetic valve, the boosting capability of ram pump, accumulator, all can impact the performance of hydraulic control unit.Therefore, in the exploitation of hydraulic control unit, Design and optimization and manufacture process, it is necessary for carrying out full test to the performance of hydraulic control unit.

At present, mainly detect hydraulic control unit in production line, its Detection of content is single, and detection method is rough, and the overall performance of reaction hydraulic control unit that can not be good, partial test means also can cause irreversible destruction to hydraulic control unit.

Summary of the invention

For the problems referred to above, the object of this invention is to provide and a kind ofly can carry out safety, reliably carry out full test and can reduce to test the performance test methods of hydraulic control unit in the brake system of car of intensity.

For achieving the above object, the present invention takes following technical scheme: the performance test methods of hydraulic control unit in a kind of brake system of car, it comprises the following steps: the Performance Test System 1) arranging hydraulic control unit in a brake system of car, and it comprises pressure lifting device, hydraulic plumbing system, control and measure device and environment simulator, pressure lifting device comprises fuel tank, variable output pump, voltage stabilizing accumulator, servo proportion and the first and second pneumatic ball valves, fuel tank is connected with the entrance of variable output pump by working line, variable delivery side of pump is connected with the entrance of voltage stabilizing accumulator and servo proportion respectively by working line, the outlet of servo proportion is connected with the first pneumatic ball valve and the second pneumatic ball valve respectively by working line, and the first pneumatic ball valve is all connected with hydraulic plumbing system by working line with the second pneumatic ball valve, hydraulic plumbing system comprises the first and second simulation master cylinders, first and second oil cans, 3rd to the 12 pneumatic ball valve, hydraulic control unit, first to fourth hydraulic pressure steel cylinder, exhaust fixed displacement pump, the back cavity oil inlet of the first simulation master cylinder is connected with the first pneumatic ball valve by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve and fuel tank successively by gas exhaust piping, its front cavity oil inlet is connected with the 4th pneumatic ball valve and the first oil can successively by working line, its ante-chamber oil-out is connected with the first oil-in of the 5th pneumatic ball valve and hydraulic control unit successively by working line, the back cavity oil inlet of the second simulation master cylinder is connected with the second pneumatic ball valve by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve and fuel tank successively by gas exhaust piping, its front cavity oil inlet is connected with the 6th pneumatic ball valve and the second oil can successively by working line, and its ante-chamber oil-out is connected with the second oil-in of the 7th pneumatic ball valve and hydraulic control unit successively by working line, first to fourth oil-out of hydraulic control unit is connected with the 8th to the 11 pneumatic ball valve and first to fourth hydraulic pressure steel cylinder respectively successively by working line, the oil-in of first to fourth hydraulic pressure steel cylinder is all connected with the oil-in of exhaust fixed displacement pump by gas exhaust piping, the oil-out of exhaust fixed displacement pump is connected with the 12 pneumatic ball valve by gas exhaust piping, and the 12 pneumatic ball valve is connected with the first and second front cavity oil inlet simulating master cylinder respectively by gas exhaust piping, control and measure device comprises industrial computer and sensor, industrial computer comprises main control unit and data acquisition unit, sensor comprises first and second displacement sensor, first to the 6th pressure transducer, current sensor and vibration transducer, first and second displacement transducers are fixedly connected on the piston of the first and second simulation master cylinders respectively, first and second pressure transducers are fixedly connected on the first and second oil-in places of hydraulic control unit respectively, 3rd to the 6th pressure transducer is fixedly connected on first to fourth oil-out place of hydraulic control unit respectively, current sensor is arranged in the control circuit of hydraulic control unit, vibration transducer is arranged on the housing of hydraulic control unit, first and second displacement transducers, the first to the 6th pressure transducer, current sensor are connected with PXI bus with the input end of vibration transducer respectively by industrial computer, and variable output pump, servo proportion, the first to the 5th pneumatic ball valve, hydraulic control unit, the 6th to the 11 pneumatic ball valve, exhaust fixed displacement pump are connected with PXI bus with the output terminal of the 12 pneumatic ball valve respectively by industrial computer, environment simulator adopts high-low temperature test chamber, and industrial computer is connected with environment simulator by RS232 serial ports, and hydraulic plumbing system is arranged in environment simulator, 2) flow under the different back pressure of ram pump in hydraulic control unit, pressure and temperature and active boost performance are tested respectively, 3) sealing of solenoid valve in hydraulic control unit and response time are tested respectively, 4) volume of accumulator in hydraulic control unit is tested, 5) step 2 is repeated) ~ step 4), complete the performance test to hydraulic control unit in brake system of car.

Described step 2) in, to ram pump in hydraulic control unit in different back pressure, flow under pressure and temperature is tested respectively, it comprises the following steps: (1) is tested the flow of ram pump under different back pressure, it specifically comprises: 1. industrial computer closes the 3rd by PXI bus marco, 4th, 6th and the 12 pneumatic ball valve, industrial computer opens first by PXI bus marco, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and vacuum solenoid valve, and control to close suction solenoid valve, the motor of boost electromagnetic valve and ram pump, set up test hydraulic channel, 2. the target back pressure needed for the generation of industrial computer controlled pressure lifting gear, 3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit, ram pump sucks the oil in first to fourth hydraulic pressure steel cylinder, in this process, first displacement transducer gathers the amount of piston displacement of the first simulation master cylinder, second displacement sensor gathers the amount of piston displacement of the second simulation master cylinder, and the displacement collected is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, 4. industrial computer calculates the flow of ram pump under this target back pressure of hydraulic control unit according to the displacement received, piston area and displacement acquisition time, (2) ram pump flow is at various pressures tested, it specifically comprises: 1. industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. the goal pressure needed for the generation of industrial computer controlled pressure lifting gear, 3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit and boost electromagnetic valve, to realize carrying out pressurize to the pressure of plunger pump intake, the pressure stability of first to fourth hydraulic pressure steel cylinder, 4. shed pressure lifting device and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, industrial computer opens the 3rd pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit, the motor of vacuum solenoid valve and ram pump, ram pump carries out decompression oil suction to first to fourth hydraulic pressure steel cylinder, in this process, first displacement transducer gathers the amount of piston displacement of the first simulation master cylinder, second displacement sensor gathers the amount of piston displacement of the second simulation master cylinder, the displacement collected is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, 5. industrial computer calculates the flow of ram pump under this goal pressure of hydraulic control unit according to the displacement received, piston area and displacement acquisition time, (3) test ram pump flow at different temperatures, it specifically comprises: 1. industrial computer arranges the temperature in high-low temperature test chamber by RS232 serial communication, 2. the method identical with step (2) from step (1) is adopted to test the flow of ram pump in hydraulic control unit under back pressure different during a certain temperature or different pressures respectively.

Described step 2) in, to ram pump in hydraulic control unit in different back pressure, active boost performance under pressure and temperature is tested respectively, it comprises the following steps: (1) is tested the active boost ability of ram pump under different back pressure, it specifically comprises: 1. industrial computer opens first by PXI bus marco, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve, industrial computer closes the 3rd by PXI bus marco, 4th, 6th and the 12 pneumatic ball valve, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close suction solenoid valve, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. the target back pressure needed for the generation of industrial computer controlled pressure lifting gear, 3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, the pressure stability of first to fourth hydraulic pressure steel cylinder, 4. shed pressure lifting device and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, and industrial computer opens the 3rd pneumatic ball valve by PXI bus marco, then, industrial computer opens the 4th and the 6th pneumatic ball valve by PXI bus marco, and industrial computer controls the motor of suction solenoid valve and the ram pump opened in hydraulic control unit, and ram pump carries out oil suction supercharging, 5. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different back pressure lower plunger pump, (2) ram pump active boost ability is at various pressures tested, it specifically comprises: 1. industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the motor of pressure limiting solenoid valve, vacuum solenoid valve and the ram pump of closing in hydraulic control unit, and control to open suction solenoid valve and boost electromagnetic valve, set up test hydraulic channel, 2. the goal pressure needed for the generation of industrial computer controlled pressure lifting gear, 3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit, ram pump oil suction, to first to fourth hydraulic pressure steel cylinder supercharging, 4. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different pressures lower plunger pump, (3) test ram pump active boost ability at different temperatures, it specifically comprises: 1. industrial computer arranges the temperature in high-low temperature test chamber by RS232 serial communication, 2. the method identical with step (2) from step (1) is adopted to test the active boost ability of ram pump in hydraulic control unit under back pressure different during a certain temperature or different pressures respectively.

Described step 3) in, the sealing of solenoid valve in hydraulic control unit is tested, it specifically comprises: (1) is tested the sealing of boost electromagnetic valve in hydraulic control unit, its concrete test process is: 1. industrial computer opens first by PXI bus marco, second and the 5th pneumatic ball valve, 7th to the 11 pneumatic ball valve, industrial computer closes the 3rd by PXI bus marco, 4th, 6th and the 12 pneumatic ball valve, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit, and control to close suction solenoid valve, boost electromagnetic valve, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. industrial computer controlled pressure lifting gear produces certain pressure, 3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, and after the force value received is stable, industrial computer controlled pressure lifting gear keeps the pressure produced, 4. within a certain period of time, first displacement sensor first simulates the piston displacement of master cylinder, second displacement sensor second simulates the piston displacement of master cylinder, the displacement signal recorded is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, and industrial computer judges the sealing of boost electromagnetic valve according to the displacement signal received, (2) if the sealing of boost electromagnetic valve is good, then the sealing of pressure limiting solenoid valve and vacuum solenoid valve in hydraulic control unit is tested, otherwise test terminates, its concrete test process is: 1. industrial computer opens first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. industrial computer controlled pressure lifting gear produces certain working pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, first to fourth hydraulic pressure steel cylinder pressurize, 3. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, then in hydraulic control unit, the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good, (3) if the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good, then the sealing sucking solenoid valve in hydraulic control unit is tested, otherwise test terminates, its concrete test process is: 1. industrial computer controls to open first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls vacuum solenoid valve, the boost electromagnetic valve opened in hydraulic control unit, close pressure limiting valve, suction valve, piston pump motor in hydraulic control unit, set up testing hydraulic passage, 2. industrial computer controlled pressure lifting gear produces certain pressure, by the retaining valve of the pressure limiting solenoid valve bypass in hydraulic control unit to first to fourth hydraulic pressure steel cylinder supercharging, 3. the 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, and the pressure signal recorded is transferred to industrial computer, after the pressure signal recorded is stable, remove hydraulic lifting apparatus and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, and controls to open the 3rd pneumatic ball valve, 4. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, then the sealing sucking solenoid valve in hydraulic control unit is good.

Described step 3) in, the response time of solenoid valve in hydraulic control unit is tested, it specifically comprises: (1) was tested the response time that boost electromagnetic valve in hydraulic control unit is opened, its detailed process is: 1. industrial computer opens first by PXI bus marco, second, 5th and the 7th pneumatic ball valve, industrial computer closes the 3rd by PXI bus marco, 4th and the 6th pneumatic ball valve and the 8th to the 12 pneumatic ball valve, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, suck solenoid valve, boost electromagnetic valve, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the boost electromagnetic valve opened in hydraulic control unit, 3. when the boost electromagnetic valve in hydraulic control unit is opened, current sensor measurement flows through the electric current of each solenoid valve in hydraulic control unit, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, and namely the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal is the response time that boost electromagnetic valve valve is opened, after being completed, pneumatic ball valve and solenoid valve restPose, (2) test the response time that boost electromagnetic valve in hydraulic control unit is closed, its detailed process is: 1. industrial computer opens boost electromagnetic valve by PXI bus marco, 2. industrial computer controls to close each boost electromagnetic valve successively, current sensor measurement flows through the electric current of boost electromagnetic valve, the vibration signal that valve land produces measured by vibration transducer, and the response time closed by the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of vibration signal and pressure charging valve, (3) response time that vacuum solenoid valve in hydraulic control unit is opened is tested, its detailed process is: 1. industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel, 2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, close the asphalt channel of first to fourth hydraulic pressure steel cylinder, carry out pressurize, 3. industrial computer controls the vacuum solenoid valve opened in hydraulic control unit, current sensor measurement flows through the electric current of vacuum solenoid valve, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, the response time that the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal and reduction valve are opened, (4) response time that vacuum solenoid valve in hydraulic control unit is closed is tested, its detailed process is: 1. industrial computer opens first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the vacuum solenoid valve opened in hydraulic control unit, industrial computer controls to close vacuum solenoid valve successively, sets up test hydraulic channel, 2. current sensor measurement flows through the electric current of vacuum solenoid valve, and the vibration signal that valve land produces measured by vibration transducer, the response time that the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of vibration signal and vacuum solenoid valve are closed.

Described step 4) in, the volume of accumulator in hydraulic control unit is tested, its concrete test process is: 1. industrial computer closes the 3rd, the 4th and the 6th pneumatic ball valve and the 8th to the 12 pneumatic ball valve by PXI bus marco, industrial computer by PXI bus marco open first, second, the 5th and the 7th pneumatic ball valve, industrial computer controls pressure limiting valve, pressure charging valve and the reduction valve opened in hydraulic control unit, industrial computer controls the motor of closing suction valve and ram pump, sets up test hydraulic channel; 2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, keeps a period of time, make to be full of brake fluid in accumulator; Industrial computer controls the motor of pressure limiting valve, suction valve, pressure charging valve, reduction valve and the ram pump of closing in hydraulic control unit, and the brake fluid in accumulator is sealed up for safekeeping; 3. remove pressure lifting device and act on pressure on the first and second simulation master cylinders, concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, industrial computer opens the 3rd pneumatic ball valve by PXI bus marco, industrial computer controls the motor of pressure limiting valve and the ram pump opened in hydraulic control unit, makes the braking liquid pump in two accumulators enter the first and second simulation master cylinders respectively; 4. when extracting accumulator brake fluid, first displacement sensor first simulates the piston displacement of master cylinder, second displacement sensor second simulates the piston displacement of master cylinder, the displacement signal recorded is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, industrial computer utilizes the displacement signal received to be multiplied by simulation master cylinder cavity cross-section and amasss, calculate the volume knots modification of the first and second simulation master cylinders, the volume of the corresponding accumulator of this volume knots modification.

The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is owing to being provided with the Performance Test System that comprises hydraulic control unit in the brake system of car of pressure lifting device, hydraulic plumbing system, control and measure device and environment simulator, by the industrial computer in control and measure device, the method for testing of hydraulic control unit is carried out standardization, therefore adopt the present invention can carry out full test to hydraulic control unit safely, reliably, and can significantly reduce to test intensity.2, the present invention is connected with pressure lifting device, hydraulic plumbing system and sensor respectively because the industrial computer in control and measure device passes through PXI bus, this connected mode has that precision is high, response frequency is fast, reliability high, therefore adopts the present invention can ensure real-time and the reliability of hydraulic control unit performance test.3, the present invention replaces real vehicle master cylinder and the performance of real vehicle wheel cylinder to hydraulic control unit to test owing to adopting simulation master cylinder and hydraulic pressure steel cylinder, therefore the present invention can avoid the error that real vehicle master cylinder and real vehicle wheel cylinder may cause hydraulic control unit performance test because of manufacture deviation, thus can ensure integrated testability precision.4, the present invention is owing to being provided with environment simulator, hydraulic plumbing system is arranged in environment simulator, by the temperature in industrial computer control, monitoring of environmental analogue means, therefore the present invention can test the performance parameter of hydraulic control unit at varying environment temperature and brake fluid temperature.Based on above advantage, the present invention can be widely used in the test of hydraulic control unit.

Accompanying drawing explanation

Fig. 1 is the composition structural representation of the Performance Test System of hydraulic control unit in brake system of car

Fig. 2 is the flow rate test process flow diagram of ram pump in HCU

Fig. 3 is the active boost performance test process flow diagram of ram pump in HCU

Fig. 4 is solenoid valve sealing property test flow chart in HCU

Fig. 5 is solenoid valve response time test flow chart in HCU

Fig. 6 is that in HCU, response time schematic diagram opened by pressure charging valve

Fig. 7 is that in HCU, pressure charging valve cuts out response time schematic diagram

Fig. 8 is accumulator volume test flow chart in HCU

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in detail.

In brake system of car of the present invention, the performance test methods of hydraulic control unit comprises the following steps:

1) as shown in Figure 1, arrange the Performance Test System of hydraulic control unit in a brake system of car, it comprises pressure lifting device, hydraulic plumbing system, control and measure device and environment simulator.

Pressure lifting device comprises fuel tank 1, variable output pump 2, voltage stabilizing accumulator 3, servo proportion 4, first pneumatic ball valve 5 and the second pneumatic ball valve 6.Fuel tank 1 is connected by the entrance of working line with variable output pump 2, the outlet of variable output pump 2 is connected with the entrance of voltage stabilizing accumulator 3 and servo proportion 4 respectively by working line, the outlet of servo proportion 4 is connected with the first pneumatic ball valve 5 and the second pneumatic ball valve 6 respectively by working line, and the first pneumatic ball valve 5 is all connected with hydraulic plumbing system by working line with the second pneumatic ball valve 6.Variable output pump 2 extracts brake fluid from fuel tank 1, also successively by delivering to hydraulic plumbing system after servo proportion 4, first pneumatic ball valve 5 and the second pneumatic ball valve 6 after carrying out supercharging to brake fluid.Voltage stabilizing accumulator 3 exports the pressure of brake fluid for stable variable output pump 2, eliminates pressure surge.

Hydraulic plumbing system comprises the first simulation master cylinder 7, 3rd pneumatic ball valve 8, 4th pneumatic ball valve 9, first oil can 10, 5th pneumatic ball valve 11, hydraulic control unit 12, second simulation master cylinder 13, 6th pneumatic ball valve 14, second oil can 15, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, first hydraulic pressure steel cylinder 18, 9th pneumatic ball valve 19, second hydraulic pressure steel cylinder 20, tenth pneumatic ball valve 21, 3rd hydraulic pressure steel cylinder 22, 11 pneumatic ball valve 23, 4th hydraulic pressure steel cylinder 24, exhaust fixed displacement pump 25, 12 pneumatic ball valve 26.The back cavity oil inlet of the first simulation master cylinder 7 is connected with the first pneumatic ball valve 5 by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve 8 and fuel tank 1 successively by gas exhaust piping, its front cavity oil inlet is connected with the 4th pneumatic ball valve 9 and the first oil can 10 successively by working line, and its ante-chamber oil-out is connected with the first oil-in of the 5th pneumatic ball valve 11 and hydraulic control unit 12 successively by working line.The back cavity oil inlet of the second simulation master cylinder 13 is connected with the second pneumatic ball valve 6 by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve 8 and fuel tank 1 successively by gas exhaust piping, its front cavity oil inlet is connected with the 6th pneumatic ball valve 14 and the second oil can 15 successively by working line, and its ante-chamber oil-out is connected with the second oil-in of the 7th pneumatic ball valve 16 and hydraulic control unit 12 successively by working line.First oil-out of hydraulic control unit 12 is connected with the 8th pneumatic ball valve 17 and the first hydraulic pressure steel cylinder 18 successively by working line, second oil-out of hydraulic control unit 12 is connected with the 9th pneumatic ball valve 19 and the second hydraulic pressure steel cylinder 20 successively by working line, 3rd oil-out of hydraulic control unit 12 is connected with the tenth pneumatic ball valve 21 and the 3rd hydraulic pressure steel cylinder 22 successively by working line, and the 4th oil-out of hydraulic control unit 12 is connected with the 11 pneumatic ball valve 23 and the 4th hydraulic pressure steel cylinder 24 successively by working line.First hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 are all connected with the oil-in of exhaust fixed displacement pump 25 by gas exhaust piping with the oil-in of the 4th hydraulic pressure steel cylinder 24, the oil-out of exhaust fixed displacement pump 25 is connected with the 12 pneumatic ball valve 26 by gas exhaust piping, and the 12 pneumatic ball valve 26 simulates the front cavity oil inlet of master cylinder 7 respectively with first by gas exhaust piping and the second front cavity oil inlet simulating master cylinder 13 is connected.

Control and measure device comprises industrial computer (not shown) and sensor.Wherein, industrial computer comprises main control unit and data acquisition unit.Sensor comprises the first displacement transducer 27, second displacement sensor 28, first pressure transducer 29, second pressure transducer 30, the 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33, the 6th pressure transducer 34, current sensor (not shown) and vibration transducer (not shown).Wherein, first displacement transducer 27 is fixedly connected on the piston of the first simulation master cylinder 7, for measuring the piston displacement of the first simulation master cylinder 7, second displacement sensor 28 is fixedly connected on the piston of the second simulation master cylinder 13, for measuring the piston displacement of the second simulation master cylinder 13.

First pressure transducer 29 and the second pressure transducer 30 are fixedly connected on the first oil-in and the second oil-in place of hydraulic control unit 12 respectively, for measuring the pressure of hydraulic control unit 12 oil-in place brake fluid.3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33, the 6th pressure transducer 34 are fixedly connected on first to fourth oil-out place of hydraulic control unit 12 respectively, for measuring the pressure of hydraulic control unit 12 oil-out place brake fluid.Current sensor is arranged in the control circuit of hydraulic control unit 12, for measuring the electric current flowing through each solenoid valve in hydraulic control unit 12.Vibration transducer is arranged on the housing of hydraulic control unit 12, for measuring the vibration that in hydraulic control unit 12, valve core of the electromagnetic valve is taken a seat, thus judges the closing moment of solenoid valve.

First displacement transducer 27, second displacement sensor 28, first pressure transducer 29, second pressure transducer 30, 3rd pressure transducer 31, 4th pressure transducer 32, 5th pressure transducer 33, 6th pressure transducer 34, current sensor and vibration transducer are connected to PXI (PCI eXtensionsforInstrumentation respectively by the input end of industrial computer, PCI towards instrument system expands) in bus, variable output pump 2, servo proportion 4, first pneumatic ball valve 5, second pneumatic ball valve 6, 3rd pneumatic ball valve 8, 4th pneumatic ball valve 9, 5th pneumatic ball valve 11, hydraulic control unit 12, 6th pneumatic ball valve 14, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve 21, 11 pneumatic ball valve 23, exhaust fixed displacement pump the 25 and the 12 pneumatic ball valve 26 is connected in PXI bus respectively by the output terminal of industrial computer.

Environment simulator (not shown) adopts high-low temperature test chamber, and industrial computer is connected with environment simulator by RS232 serial ports, and the temperature for controlling, in monitoring of environmental analogue means, makes temperature regulate arbitrarily between-40 DEG C ~ 70 DEG C.Hydraulic plumbing system is arranged in environment simulator, can be tested by the temperature changed in high-low temperature test chamber to the performance parameter of hydraulic control unit 12 at varying environment temperature and brake fluid temperature.

2) flow of ram pump in hydraulic control unit 12 and active boost performance are tested respectively;

As shown in Figure 2, test the flow of ram pump under different back pressure, pressure and temperature in hydraulic control unit 12 respectively, it specifically comprises the following steps:

(1) as shown in figure (a), test the flow of ram pump under different back pressure, it specifically comprises:

1. industrial computer closes the 3rd pneumatic ball valve 8, the 4th pneumatic ball valve 9, the 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26 by PXI bus marco, and industrial computer opens the first pneumatic ball valve 5, second pneumatic ball valve 6, the 5th pneumatic ball valve 11, the 7th pneumatic ball valve 16, the 8th pneumatic ball valve 17, the 9th pneumatic ball valve 19, the tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23 by PXI bus marco.Industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12 and vacuum solenoid valve, and controls the motor of suction solenoid valve, boost electromagnetic valve and the ram pump of closing in hydraulic control unit 12, sets up test hydraulic channel.

2. the target back pressure needed for the generation of industrial computer controlled pressure lifting gear.

3. the force value (i.e. the top hole pressure of ram pump) of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit 12, ram pump sucks the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, oil in 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24, in this process, first displacement transducer 27 gathers the amount of piston displacement of the first simulation master cylinder 7, second displacement sensor 28 gathers the amount of piston displacement of the second simulation master cylinder 13, the displacement collected is transferred to industrial computer by the first displacement transducer 27 and second displacement sensor 28 respectively.

4. industrial computer calculates the flow of ram pump under this target back pressure of hydraulic control unit 12 according to the displacement received, piston area and displacement acquisition time.

(2) as shown in figure (b), test ram pump flow at various pressures, it specifically comprises:

1. industrial computer closes the 3rd pneumatic ball valve 8, the 4th pneumatic ball valve 9, the 6th pneumatic ball valve the 14, the 12 pneumatic ball valve 26 and by PXI bus marco, and industrial computer opens the first pneumatic ball valve 5, second pneumatic ball valve 6, the 5th pneumatic ball valve 11, the 7th pneumatic ball valve 16, the 8th pneumatic ball valve 17, the 9th pneumatic ball valve 19, the tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23 by PXI bus marco.Industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12 and boost electromagnetic valve, and controls the motor of suction solenoid valve, vacuum solenoid valve and the ram pump of closing in hydraulic control unit 12, sets up test hydraulic channel.

2. the goal pressure needed for the generation of industrial computer controlled pressure lifting gear.

3. the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit 12 and boost electromagnetic valve, to realize carrying out pressurize to the pressure of plunger pump intake, the pressure stability of the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24.

4. shed pressure lifting device and act on pressure on the first simulation master cylinder 7 and the second simulation master cylinder 13, its concrete grammar is: industrial computer closes the first pneumatic ball valve 5 and the second pneumatic ball valve 6 by PXI bus marco, and industrial computer opens the 3rd pneumatic ball valve 8 by PXI bus marco.Industrial computer controls the motor of pressure limiting solenoid valve, vacuum solenoid valve and the ram pump opened in hydraulic control unit 12, and ram pump carries out decompression oil suction to the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24.First displacement transducer 27 gathers the amount of piston displacement of the first simulation master cylinder 7, second displacement sensor 28 gathers the amount of piston displacement of the second simulation master cylinder 13, and the displacement collected is transferred to industrial computer by the first displacement transducer 27 and second displacement sensor 28 respectively.5. industrial computer calculates the flow of ram pump under this goal pressure of hydraulic control unit 12 according to the displacement received, piston area and displacement acquisition time.

(3) test ram pump flow at different temperatures, it specifically comprises:

1. industrial computer is by the temperature in RS232 serial communication adjustment high-low temperature test chamber.

2. the method identical with step (2) from step (1) is adopted to test the flow of ram pump in hydraulic control unit 12 under back pressure different during a certain temperature or different pressures respectively.

As shown in Figure 3, test respectively the active boost performance of ram pump in hydraulic control unit 12 under different back pressure, pressure and temperature, it specifically comprises the following steps:

(1) as shown in figure (a), test the active boost ability of ram pump under different back pressure, it specifically comprises:

1. industrial computer opens the first pneumatic ball valve 5 by PXI bus marco, second pneumatic ball valve 6, 5th pneumatic ball valve 11, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23, industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12 and boost electromagnetic valve, and control to close the suction solenoid valve in hydraulic control unit 12, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel.

3. the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit 12, the pressure stability of the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24.

4. shed pressure lifting device and act on pressure on the first simulation master cylinder 7 and the second simulation master cylinder 13, its concrete grammar is: industrial computer closes the first pneumatic ball valve 5 and the second pneumatic ball valve 6 by PXI bus marco, and industrial computer opens the 3rd pneumatic ball valve 8 by PXI bus marco.Then, industrial computer opens the 4th pneumatic ball valve 9 and the 6th pneumatic ball valve 14 by PXI bus marco, and industrial computer controls the motor of suction solenoid valve and the ram pump opened in hydraulic control unit 12, and ram pump carries out oil suction supercharging.

5. within a certain period of time, 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different back pressure lower plunger pump.

(2) as figure (b), test ram pump active boost ability at various pressures, it specifically comprises:

1. industrial computer opens the first pneumatic ball valve 5 by PXI bus marco, second pneumatic ball valve 6, 5th pneumatic ball valve 11, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23, industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit 12, the motor of vacuum solenoid valve and ram pump, and control the suction solenoid valve opened in hydraulic control unit 12 and boost electromagnetic valve, set up test hydraulic channel.

3. the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit 12, ram pump oil suction, to the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24 supercharging.

4. within a certain period of time, 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different pressures lower plunger pump.

(3) test ram pump active boost ability at different temperatures, it specifically comprises:

1. industrial computer arranges the temperature in high-low temperature test chamber by RS232 serial communication.

2. the method identical with step (2) from step (1) is adopted to test the active boost ability of ram pump in hydraulic control unit 12 under back pressure different during a certain temperature or different pressures respectively.

3) sealing of solenoid valve in hydraulic control unit 12 and response time are tested respectively;

As shown in Figure 4, test the sealing of boost electromagnetic valve, pressure limiting solenoid valve, vacuum solenoid valve and suction solenoid valve in hydraulic control unit 12 respectively, it specifically comprises:

(1) test the sealing of boost electromagnetic valve in hydraulic control unit 12, its concrete test process is:

1. industrial computer opens the first pneumatic ball valve 5 by PXI bus marco, second pneumatic ball valve 6, 5th pneumatic ball valve 11, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23, industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12, and control to close suction solenoid valve, boost electromagnetic valve, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel.

2. industrial computer controlled pressure lifting gear produces certain pressure.

3. the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, and after the force value received is stable, industrial computer controlled pressure lifting gear keeps the pressure produced.

4. within a certain period of time, the piston displacement of the first simulation master cylinder 7 measured by first displacement transducer 27, second displacement sensor 28 measures the piston displacement of the second simulation master cylinder 13, the displacement signal recorded is transferred to industrial computer by the first displacement transducer 27 and second displacement sensor 28 respectively, and industrial computer judges the sealing of boost electromagnetic valve according to the displacement signal received.

(2) if the sealing of boost electromagnetic valve is good, then the sealing of pressure limiting solenoid valve and vacuum solenoid valve in hydraulic control unit 12 is tested; Otherwise test terminates; Its concrete test process is:

1. industrial computer opens the first pneumatic ball valve 5 by PXI bus marco, second pneumatic ball valve 6, 5th pneumatic ball valve 11, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23, industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12 and boost electromagnetic valve, and control to close suction solenoid valve, the motor of vacuum solenoid valve and ram pump, set up test hydraulic channel.

2. industrial computer controlled pressure lifting gear produces certain working pressure, the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit 12, the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24 pressurize.

3. within a certain period of time, 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, such as, in 30s, pressure drop is less than 0.5Mpa, then in hydraulic control unit 12, the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good.

(3) if the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good, then the sealing sucking solenoid valve in hydraulic control unit 12 is tested, otherwise test terminates; Its concrete test process is:

1. industrial computer controls to open the first pneumatic ball valve 5, second pneumatic ball valve 6, 5th pneumatic ball valve 11, 7th pneumatic ball valve 16, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23, industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26, industrial computer controls the vacuum solenoid valve opened in hydraulic control unit 12, boost electromagnetic valve, close pressure limiting valve in hydraulic control unit 12, suction valve, piston pump motor, set up testing hydraulic passage.

2. industrial computer controlled pressure lifting gear produces certain pressure, by the retaining valve of the pressure limiting solenoid valve bypass in hydraulic control unit 12 to the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24 supercharging.

3. the 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, and the pressure signal recorded is transferred to industrial computer, after the pressure signal recorded is stable, remove hydraulic lifting apparatus and act on pressure on the first simulation master cylinder 7 and the second simulation master cylinder 13, its concrete grammar is: industrial computer closes the first pneumatic ball valve 5 and the second pneumatic ball valve 6 by PXI bus marco, and controls to open the 3rd pneumatic ball valve 8.

4. within a certain period of time, 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, such as, in 30s, pressure drop is in 0.5MPa, then the sealing sucking solenoid valve in hydraulic control unit 12 is good.

As shown in Figure 5, test the response time of solenoid valve in hydraulic control unit 12, it specifically comprises:

(1) test the response time that boost electromagnetic valve in hydraulic control unit 12 is opened, its detailed process is:

1. industrial computer opens the first pneumatic ball valve 5, second pneumatic ball valve 6, the 5th pneumatic ball valve 11 and the 7th pneumatic ball valve 16 by PXI bus marco, and industrial computer closes the 3rd pneumatic ball valve 8, the 4th pneumatic ball valve 9, the 6th pneumatic ball valve 14, the 8th pneumatic ball valve 17, the 9th pneumatic ball valve 19, the tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve the 23 and the 12 pneumatic ball valve 26 by PXI bus marco.Pressure limiting solenoid valve in industrial computer control closedown hydraulic control unit 12, the motor of suction solenoid valve, boost electromagnetic valve, vacuum solenoid valve and ram pump, set up test hydraulic channel.

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls the boost electromagnetic valve opened in hydraulic control unit 12.

3. when the boost electromagnetic valve in hydraulic control unit 12 is opened, current sensor measurement flows through the electric current of each solenoid valve in hydraulic control unit 12,3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, as shown in Figure 6, namely the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal is the response time that boost electromagnetic valve valve is opened.After being completed, pneumatic ball valve and solenoid valve restPose.

(2) test the response time that boost electromagnetic valve in hydraulic control unit 12 is closed, its detailed process is:

1. industrial computer opens boost electromagnetic valve by PXI bus marco.

2. industrial computer controls to close each boost electromagnetic valve successively, current sensor measurement flows through the electric current of boost electromagnetic valve, the vibration signal that valve land produces measured by vibration transducer, as shown in Figure 7, the response time closed by the moment of the obvious saltus step of current signal and the mistiming of the obvious jumping moment of vibration signal and pressure charging valve.

(3) test the response time that vacuum solenoid valve in hydraulic control unit 12 is opened, its detailed process is:

1. industrial computer opens the first pneumatic ball valve 5, second pneumatic ball valve 6, the 5th pneumatic ball valve 11, the 7th pneumatic ball valve 16, the 8th pneumatic ball valve 17, the 9th pneumatic ball valve 19, the tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23 by PXI bus marco, and industrial computer closes the 3rd pneumatic ball valve 8, the 4th pneumatic ball valve 9, the 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26 by PXI bus marco.Industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit 12 and boost electromagnetic valve, and industrial computer controls the motor of suction solenoid valve, vacuum solenoid valve and the ram pump of closing in hydraulic control unit 12, sets up test hydraulic channel.

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit 12, close the asphalt channel of the first hydraulic pressure steel cylinder 18, second hydraulic pressure steel cylinder 20, the 3rd hydraulic pressure steel cylinder 22 and the 4th hydraulic pressure steel cylinder 24, carry out pressurize.

3. industrial computer controls the vacuum solenoid valve opened in hydraulic control unit 12, current sensor measurement flows through the electric current of vacuum solenoid valve, 3rd pressure transducer 31, the 4th pressure transducer 32, the 5th pressure transducer 33 and the 6th pressure transducer 34 are measured the pressure of hydraulic control unit 12 oil-out place brake fluid respectively, the response time that the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal and reduction valve are opened.

(4) test the response time that vacuum solenoid valve in hydraulic control unit 12 is closed, its detailed process is:

1. industrial computer opens the first pneumatic ball valve 5, second pneumatic ball valve 6, the 5th pneumatic ball valve 11, the 7th pneumatic ball valve 16, the 8th pneumatic ball valve 17, the 9th pneumatic ball valve 19, the tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve 23 by PXI bus marco, and industrial computer closes the 3rd pneumatic ball valve 8, the 4th pneumatic ball valve 9, the 6th pneumatic ball valve the 14 and the 12 pneumatic ball valve 26 by PXI bus marco.Industrial computer controls the vacuum solenoid valve opened in hydraulic control unit 12, and industrial computer controls to close the vacuum solenoid valve in hydraulic control unit 12 successively, sets up test hydraulic channel.

2. current sensor measurement flows through the electric current of vacuum solenoid valve, and the vibration signal that valve land produces measured by vibration transducer, the response time that the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of vibration signal and vacuum solenoid valve are closed.

4) as shown in Figure 8, test the volume of accumulator in hydraulic control unit 12, its concrete test process is:

1. industrial computer closes the 3rd pneumatic ball valve 8 by PXI bus marco, 4th pneumatic ball valve 9, 6th pneumatic ball valve 14, 8th pneumatic ball valve 17, 9th pneumatic ball valve 19, tenth pneumatic ball valve the 21 and the 11 pneumatic ball valve the 23 and the 12 pneumatic ball valve 26, industrial computer opens the first pneumatic ball valve 5 by PXI bus marco, second pneumatic ball valve 6, 5th pneumatic ball valve 11 and the 7th pneumatic ball valve 16, industrial computer controls the pressure limiting valve opened in hydraulic control unit 12, pressure charging valve and reduction valve, suction valve in industrial computer control closedown hydraulic control unit 12 and the motor of ram pump, set up test hydraulic channel.

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit 12 oil-in place brake fluid collected is transferred to industrial computer by the first pressure transducer 29 and the second pressure transducer 30 respectively, after the force value received is stable, keep a period of time, make to be full of brake fluid in accumulator.Industrial computer controls the motor of pressure limiting valve, suction valve, pressure charging valve, reduction valve and the ram pump of closing in hydraulic control unit 12, and the brake fluid in accumulator is sealed up for safekeeping.

3. remove pressure lifting device and act on pressure on the first simulation master cylinder 7 and the second simulation master cylinder 13, concrete grammar is: industrial computer closes the first pneumatic ball valve 5 and the second pneumatic ball valve 6 by PXI bus marco, and industrial computer opens the 3rd pneumatic ball valve 8 by PXI bus marco.Industrial computer controls the motor of pressure limiting valve and the ram pump opened in hydraulic control unit 12, makes the braking liquid pump in two accumulators enter the first simulation master cylinder 7 and the second simulation master cylinder 13 respectively.

4. when extracting accumulator brake fluid, the piston displacement of the first simulation master cylinder 7 measured by first displacement transducer 27, second displacement sensor 28 measures the piston displacement of the second simulation master cylinder 13, the displacement signal recorded is transferred to industrial computer by the first displacement transducer 27 and second displacement sensor 28 respectively, industrial computer utilizes the displacement signal received to be multiplied by simulation master cylinder cavity cross-section and amasss, calculate the volume knots modification of the first simulation master cylinder 7 and the second simulation master cylinder 13, the volume of the corresponding accumulator of this volume knots modification.

5) step 2 is repeated) ~ step 4), complete the performance test to hydraulic control unit in brake system of car.

The various embodiments described above are only for illustration of the present invention; wherein the structure of each parts, connected mode and method step etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.

Claims

1. the performance test methods of hydraulic control unit in brake system of car, it comprises the following steps:

1) arrange the Performance Test System of hydraulic control unit in a brake system of car, it comprises pressure lifting device, hydraulic plumbing system, control and measure device and environment simulator;

Pressure lifting device comprises fuel tank, variable output pump, voltage stabilizing accumulator, servo proportion and the first and second pneumatic ball valves; Fuel tank is connected with the entrance of variable output pump by working line, variable delivery side of pump is connected with the entrance of voltage stabilizing accumulator and servo proportion respectively by working line, the outlet of servo proportion is connected with the first pneumatic ball valve and the second pneumatic ball valve respectively by working line, and the first pneumatic ball valve is all connected with hydraulic plumbing system by working line with the second pneumatic ball valve;

Hydraulic plumbing system comprises the first and second simulation master cylinders, first and second oil cans, 3rd to the 12 pneumatic ball valve, hydraulic control unit, first to fourth hydraulic pressure steel cylinder, exhaust fixed displacement pump, the back cavity oil inlet of the first simulation master cylinder is connected with the first pneumatic ball valve by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve and fuel tank successively by gas exhaust piping, its front cavity oil inlet is connected with the 4th pneumatic ball valve and the first oil can successively by working line, its ante-chamber oil-out is connected with the first oil-in of the 5th pneumatic ball valve and hydraulic control unit successively by working line, the back cavity oil inlet of the second simulation master cylinder is connected with the second pneumatic ball valve by working line, its back cavity oil-out is connected with the 3rd pneumatic ball valve and fuel tank successively by gas exhaust piping, its front cavity oil inlet is connected with the 6th pneumatic ball valve and the second oil can successively by working line, and its ante-chamber oil-out is connected with the second oil-in of the 7th pneumatic ball valve and hydraulic control unit successively by working line, first to fourth oil-out of hydraulic control unit is connected with the 8th to the 11 pneumatic ball valve and first to fourth hydraulic pressure steel cylinder respectively successively by working line, the oil-in of first to fourth hydraulic pressure steel cylinder is all connected with the oil-in of exhaust fixed displacement pump by gas exhaust piping, the oil-out of exhaust fixed displacement pump is connected with the 12 pneumatic ball valve by gas exhaust piping, and the 12 pneumatic ball valve is connected with the first and second front cavity oil inlet simulating master cylinder respectively by gas exhaust piping,

Control and measure device comprises industrial computer and sensor, industrial computer comprises main control unit and data acquisition unit, sensor comprises first and second displacement sensor, first to the 6th pressure transducer, current sensor and vibration transducer, first and second displacement transducers are fixedly connected on the piston of the first and second simulation master cylinders respectively, first and second pressure transducers are fixedly connected on the first and second oil-in places of hydraulic control unit respectively, 3rd to the 6th pressure transducer is fixedly connected on first to fourth oil-out place of hydraulic control unit respectively, current sensor is arranged in the control circuit of hydraulic control unit, vibration transducer is arranged on the housing of hydraulic control unit, first and second displacement transducers, the first to the 6th pressure transducer, current sensor are connected with PXI bus with the input end of vibration transducer respectively by industrial computer, and variable output pump, servo proportion, the first to the 5th pneumatic ball valve, hydraulic control unit, the 6th to the 11 pneumatic ball valve, exhaust fixed displacement pump are connected with PXI bus with the output terminal of the 12 pneumatic ball valve respectively by industrial computer,

Environment simulator adopts high-low temperature test chamber, and industrial computer is connected with environment simulator by RS232 serial ports, and hydraulic plumbing system is arranged in environment simulator;

2) flow under the different back pressure of ram pump in hydraulic control unit, pressure and temperature and active boost performance are tested respectively;

3) sealing of solenoid valve in hydraulic control unit and response time are tested respectively;

4) volume of accumulator in hydraulic control unit is tested;

2. the performance test methods of hydraulic control unit in a kind of brake system of car as claimed in claim 1, it is characterized in that: described step 2) in, test respectively the flow of ram pump in hydraulic control unit under different back pressure, pressure and temperature, it comprises the following steps:

(1) test the flow of ram pump under different back pressure, it specifically comprises:

1. industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and vacuum solenoid valve, and control to close the motor sucking solenoid valve, boost electromagnetic valve and ram pump, set up test hydraulic channel;

2. the target back pressure needed for the generation of industrial computer controlled pressure lifting gear;

3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit, ram pump sucks the oil in first to fourth hydraulic pressure steel cylinder, in this process, first displacement transducer gathers the amount of piston displacement of the first simulation master cylinder, second displacement sensor gathers the amount of piston displacement of the second simulation master cylinder, and the displacement collected is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively;

4. industrial computer calculates the flow of ram pump under this target back pressure of hydraulic control unit according to the displacement received, piston area and displacement acquisition time;

(2) test ram pump flow at various pressures, it specifically comprises:

1. industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

2. the goal pressure needed for the generation of industrial computer controlled pressure lifting gear;

3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit and boost electromagnetic valve, to realize carrying out pressurize to the pressure of plunger pump intake, the pressure stability of first to fourth hydraulic pressure steel cylinder;

4. shed pressure lifting device and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, industrial computer opens the 3rd pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit, the motor of vacuum solenoid valve and ram pump, ram pump carries out decompression oil suction to first to fourth hydraulic pressure steel cylinder, in this process, first displacement transducer gathers the amount of piston displacement of the first simulation master cylinder, second displacement sensor gathers the amount of piston displacement of the second simulation master cylinder, the displacement collected is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively,

5. industrial computer calculates the flow of ram pump under this goal pressure of hydraulic control unit according to the displacement received, piston area and displacement acquisition time;

(3) test ram pump flow at different temperatures, it specifically comprises:

1. industrial computer arranges the temperature in high-low temperature test chamber by RS232 serial communication;

2. the method identical with step (2) from step (1) is adopted to test the flow of ram pump in hydraulic control unit under back pressure different during a certain temperature or different pressures respectively.

3. the performance test methods of hydraulic control unit in a kind of brake system of car as claimed in claim 1, it is characterized in that: described step 2) in, test respectively the active boost performance of ram pump in hydraulic control unit under different back pressure, pressure and temperature, it comprises the following steps:

(1) test the active boost ability of ram pump under different back pressure, it specifically comprises:

1. industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, the pressure stability of first to fourth hydraulic pressure steel cylinder;

4. shed pressure lifting device and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, and industrial computer opens the 3rd pneumatic ball valve by PXI bus marco; Then, industrial computer opens the 4th and the 6th pneumatic ball valve by PXI bus marco, and industrial computer controls the motor of suction solenoid valve and the ram pump opened in hydraulic control unit, and ram pump carries out oil suction supercharging;

5. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different back pressure lower plunger pump;

(2) test ram pump active boost ability at various pressures, it specifically comprises:

1. industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the motor of pressure limiting solenoid valve, vacuum solenoid valve and the ram pump of closing in hydraulic control unit, and control to open suction solenoid valve and boost electromagnetic valve, set up test hydraulic channel;

3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the motor opening ram pump in hydraulic control unit, ram pump oil suction, to first to fourth hydraulic pressure steel cylinder supercharging;

4. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, draw pressure-time curve according to measuring the pressure obtained, namely this curve reacts the active boost ability of different pressures lower plunger pump;

2. the method identical with step (2) from step (1) is adopted to test the active boost ability of ram pump in hydraulic control unit under back pressure different during a certain temperature or different pressures respectively.

4. in a kind of brake system of car as described in claim 1 or 2 or 3, the performance test methods of hydraulic control unit, is characterized in that: described step 3) in, test the sealing of solenoid valve in hydraulic control unit, it specifically comprises:

(1) test the sealing of boost electromagnetic valve in hydraulic control unit, its concrete test process is:

1. industrial computer opens first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit, and control to close the motor sucking solenoid valve, boost electromagnetic valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

2. industrial computer controlled pressure lifting gear produces certain pressure;

3. the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, and after the force value received is stable, industrial computer controlled pressure lifting gear keeps the pressure produced;

4. within a certain period of time, first displacement sensor first simulates the piston displacement of master cylinder, second displacement sensor second simulates the piston displacement of master cylinder, the displacement signal recorded is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, and industrial computer judges the sealing of boost electromagnetic valve according to the displacement signal received;

(2) if the sealing of boost electromagnetic valve is good, then the sealing of pressure limiting solenoid valve and vacuum solenoid valve in hydraulic control unit is tested; Otherwise test terminates; Its concrete test process is:

1. industrial computer opens first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, and control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

2. industrial computer controlled pressure lifting gear produces certain working pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, first to fourth hydraulic pressure steel cylinder pressurize;

3. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, then in hydraulic control unit, the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good;

(3) if the sealing of pressure limiting solenoid valve and vacuum solenoid valve is good, then the sealing sucking solenoid valve in hydraulic control unit is tested, otherwise test terminates; Its concrete test process is:

1. industrial computer controls to open first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls vacuum solenoid valve, the boost electromagnetic valve opened in hydraulic control unit, close pressure limiting valve, suction valve, piston pump motor in hydraulic control unit, set up testing hydraulic passage;

2. industrial computer controlled pressure lifting gear produces certain pressure, by the retaining valve of the pressure limiting solenoid valve bypass in hydraulic control unit to first to fourth hydraulic pressure steel cylinder supercharging;

3. the 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, and the pressure signal recorded is transferred to industrial computer, after the pressure signal recorded is stable, remove hydraulic lifting apparatus and act on pressure on the first and second simulation master cylinders, its concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, and controls to open the 3rd pneumatic ball valve;

4. within a certain period of time, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, pressure-time curve is drawn according to measuring the pressure obtained, if the fall of this pressure-time curve is in critical field, then the sealing sucking solenoid valve in hydraulic control unit is good.

5. in a kind of brake system of car as described in claim 1 or 2 or 3, the performance test methods of hydraulic control unit, is characterized in that: described step 3) in, test the response time of solenoid valve in hydraulic control unit, it specifically comprises:

(1) test the response time that boost electromagnetic valve in hydraulic control unit is opened, its detailed process is:

1. industrial computer by PXI bus marco open first, second, the 5th and the 7th pneumatic ball valve, industrial computer closes the 3rd, the 4th and the 6th pneumatic ball valve and the 8th to the 12 pneumatic ball valve by PXI bus marco, pressure limiting solenoid valve in industrial computer control closedown hydraulic control unit, the motor of suction solenoid valve, boost electromagnetic valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls the boost electromagnetic valve opened in hydraulic control unit;

3. when the boost electromagnetic valve in hydraulic control unit is opened, current sensor measurement flows through the electric current of each solenoid valve in hydraulic control unit, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, and namely the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal is the response time that boost electromagnetic valve valve is opened; After being completed, pneumatic ball valve and solenoid valve restPose;

(2) test the response time that boost electromagnetic valve in hydraulic control unit is closed, its detailed process is:

1. industrial computer opens boost electromagnetic valve by PXI bus marco;

2. industrial computer controls to close each boost electromagnetic valve successively, current sensor measurement flows through the electric current of boost electromagnetic valve, the vibration signal that valve land produces measured by vibration transducer, and the response time closed by the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of vibration signal and pressure charging valve;

(3) test the response time that vacuum solenoid valve in hydraulic control unit is opened, its detailed process is:

1. industrial computer opens first, second and the 5th pneumatic ball valve and the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the pressure limiting solenoid valve opened in hydraulic control unit and boost electromagnetic valve, control to close the motor sucking solenoid valve, vacuum solenoid valve and ram pump, set up test hydraulic channel;

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, industrial computer controls to close the pressure limiting solenoid valve in hydraulic control unit, close the asphalt channel of first to fourth hydraulic pressure steel cylinder, carry out pressurize;

3. industrial computer controls the vacuum solenoid valve opened in hydraulic control unit, current sensor measurement flows through the electric current of vacuum solenoid valve, 3rd to the 6th pressure transducer is measured the pressure of hydraulic control unit oil-out place brake fluid respectively, the response time that the mistiming in the moment of the obvious saltus step of current signal and the moment of the obvious saltus step of pressure signal and reduction valve are opened;

(4) test the response time that vacuum solenoid valve in hydraulic control unit is closed, its detailed process is:

1. industrial computer opens first, second and the 5th pneumatic ball valve, the 7th to the 11 pneumatic ball valve by PXI bus marco, industrial computer closes the 3rd, the 4th, the 6th and the 12 pneumatic ball valve by PXI bus marco, industrial computer controls the vacuum solenoid valve opened in hydraulic control unit, industrial computer controls to close vacuum solenoid valve successively, sets up test hydraulic channel;

6. in a kind of brake system of car as described in claim 1 or 2 or 3, the performance test methods of hydraulic control unit, is characterized in that: described step 4) in, test the volume of accumulator in hydraulic control unit, its concrete test process is:

1. industrial computer closes the 3rd, the 4th and the 6th pneumatic ball valve and the 8th to the 12 pneumatic ball valve by PXI bus marco, industrial computer by PXI bus marco open first, second, the 5th and the 7th pneumatic ball valve, industrial computer controls pressure limiting valve, pressure charging valve and the reduction valve opened in hydraulic control unit, industrial computer controls the motor of closing suction valve and ram pump, sets up test hydraulic channel;

2. industrial computer controlled pressure lifting gear produces certain pressure, the force value of the hydraulic control unit oil-in place brake fluid collected is transferred to industrial computer by the first and second pressure transducers respectively, after the force value received is stable, keeps a period of time, make to be full of brake fluid in accumulator; Industrial computer controls the motor of pressure limiting valve, suction valve, pressure charging valve, reduction valve and the ram pump of closing in hydraulic control unit, and the brake fluid in accumulator is sealed up for safekeeping;

3. remove pressure lifting device and act on pressure on the first and second simulation master cylinders, concrete grammar is: industrial computer closes the first and second pneumatic ball valves by PXI bus marco, industrial computer opens the 3rd pneumatic ball valve by PXI bus marco, industrial computer controls the motor of pressure limiting valve and the ram pump opened in hydraulic control unit, makes the braking liquid pump in two accumulators enter the first and second simulation master cylinders respectively;

4. when extracting accumulator brake fluid, first displacement sensor first simulates the piston displacement of master cylinder, second displacement sensor second simulates the piston displacement of master cylinder, the displacement signal recorded is transferred to industrial computer by the first displacement transducer and second displacement sensor respectively, industrial computer utilizes the displacement signal received to be multiplied by simulation master cylinder cavity cross-section and amasss, calculate the volume knots modification of the first and second simulation master cylinders, the volume of the corresponding accumulator of this volume knots modification.