CN111879527B - System and method for testing durability of hydraulic control unit in automobile braking system - Google Patents
System and method for testing durability of hydraulic control unit in automobile braking system Download PDFInfo
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- CN111879527B CN111879527B CN202010769858.XA CN202010769858A CN111879527B CN 111879527 B CN111879527 B CN 111879527B CN 202010769858 A CN202010769858 A CN 202010769858A CN 111879527 B CN111879527 B CN 111879527B
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Abstract
The invention discloses a system and a method for testing the durability of a hydraulic control unit in an automobile braking system. The system comprises: the system comprises an air pressure providing system, an air pressure pipeline system, a measurement and control system and an environment simulation system. According to the system and the method, the air source is used as the pressure source, so that the pressure can be quickly lifted, and the reciprocating change of the pressure can be borne; in addition, the simulated wheel cylinder can bear the reciprocating change of pressure, and the consistency of the braking characteristic is more stable. The system and method can realize that: the system automatically carries out exhaust treatment on the hydraulic control unit, monitors the pressure of a system main cylinder and a wheel cylinder, provides ambient temperature, realizes automatic control of the states of each electromagnetic valve and each motor of the hydraulic control unit, and improves the efficiency of durability test of the hydraulic control unit.
Description
Technical Field
The invention relates to the technical field of quality detection of parts in an automobile braking system, in particular to a system and a method for testing the durability of a hydraulic control unit in the automobile braking system.
Background
The Hydraulic Control Unit (HCU) is an execution component of pressure regulation of an anti-lock brake control system (ABS), and if the HCU has a poor execution effect, braking safety is directly affected.
For anti-lock, an Electronic Control Unit (ECU) issues a high-frequency command, and thus, in order to be able to respond to the command from the ECU, the HCU needs to have a high response frequency, that is, the solenoid valve therein has a high response frequency, and complete the operations of pressurization, pressure holding, and depressurization.
The HCU comprises a pressure increasing valve, a pressure reducing valve, a reflux pump, a damper, a pump motor, a low-pressure accumulator and the like. The HCU operating frequency is determined by the frequency response characteristics of the high-speed solenoid valve in the HCU, the closing effect of the fluid passage is determined by the sealing performance, and the stability in long-term use is determined by the durability, so the HCU detection items are mainly the sealing performance, the dynamic characteristics, the durability, and the like.
At present, HCU performance test beds mostly carry out related tests on the static characteristics and the dynamic performance of HCUs, such as the sealing performance of an electromagnetic valve, the response time of the electromagnetic valve, the pressure increasing and reducing capacity of a plunger pump and the like, but do not relate to the test of the durability of the HCUs, so that the evaluation on the use stability of the HCUs is directly influenced.
Disclosure of Invention
The invention provides a system and a method for testing the durability of a hydraulic control unit in an automobile brake system, aiming at solving the problems in the prior art, not only can quickly provide and monitor the pressure and temperature conditions required in the durability test of the hydraulic control unit to realize automatic test, but also can bear frequent pressure changes for many times in the durability test process by the structure of the test system, and can smoothly finish the durability test of the hydraulic control unit.
One aspect of the present invention relates to a durability test system of a hydraulic control unit in an automobile brake system, including: the system comprises an air pressure providing system, an air pressure pipeline system, a measurement and control system and an environment simulation system;
the air pressure providing system comprises an air source, a two-position five-way electromagnetic valve and an air cylinder which are sequentially connected through a pipeline;
the pneumatic pipeline system comprises an oil can, an oil tank, a main cylinder, a pneumatic ball valve, a pressure sensor and a simulation wheel cylinder, and the air cylinder is connected with the main cylinder in a pushing mode; an overflow outlet of the oil can is connected with the oil tank through a return pipeline, an oil outlet of the oil can is connected with an oil inlet of the main cylinder, two oil outlets of the main cylinder are respectively connected with two oil inlets of the hydraulic control unit through a third pipeline and a fourth pipeline, the oil tank is connected with the third pipeline through a main pipeline and a first pipeline in sequence, the oil tank is connected with the fourth pipeline through a main pipeline and a second pipeline in sequence, and four oil outlets of the hydraulic control unit are respectively connected with the oil tank through a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline; the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with pneumatic ball valves, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with the pressure sensors, and the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with the simulation wheel cylinders;
the input port of the measurement and control system is in signal connection with all the pressure sensors, and the output port of the measurement and control system is in signal connection with all the pneumatic ball valves, the two-position five-way electromagnetic valve and the hydraulic control unit;
the environment simulation system is provided with the hydraulic control unit and a pipeline connected with the hydraulic control unit and is used for simulating the temperature of the hydraulic control unit in the endurance test process.
Preferably, the air pressure providing system further comprises a proportional valve and a speed regulating valve, the proportional valve is located on a connecting pipeline of the air source and the two-position five-way electromagnetic valve, and the speed regulating valve is located on a connecting pipeline of the two-position five-way electromagnetic valve and the air cylinder.
Preferably, the pneumatic ball valve and the pressure sensor are sequentially arranged on the third pipeline and the fourth pipeline from the master cylinder to an oil inlet of the hydraulic control unit.
Preferably, a pressure sensor, a simulation wheel cylinder and a pneumatic ball valve are sequentially arranged on the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline from an oil outlet of the hydraulic control unit to the oil tank.
Preferably, a fixed displacement pump and a filter are arranged on the main pipeline, and the filter is arranged close to the oil tank.
The invention provides a durability test method for a hydraulic control unit in an automobile brake system, which comprises the following steps:
controlling an environment simulation system to change the environment temperature of the hydraulic control unit to reach a preset value;
controlling an air source to push the main cylinder to enable the pressure of the main cylinder to reach a preset value;
controlling the states of each electromagnetic valve and each motor in the hydraulic control unit according to the test sample, and carrying out durability test on the hydraulic control unit;
collecting pressure sensor signals on two inlet pipelines of the hydraulic control unit and pressure sensor signals on pipelines of four analog wheel cylinders;
and repeating all the steps to finish the durability test of the hydraulic control unit under different master cylinder preset pressure and environment preset temperature combination conditions, wherein the test is carried out according to preset test times and test periods under each combination condition.
Preferably, the environment preset temperature is-40 ℃ to 120 ℃, and the master cylinder preset pressure is 3MPa to 22 MPa; wherein, a plurality of preset test times and test periods are set under each combination condition.
Preferably, the durability test of the hydraulic control unit at different master cylinder preset pressures and ambient preset temperatures is carried out as follows:
adjusting the initial temperature to 20 ℃, and carrying out durability tests under different master cylinder preset pressures;
adjusting the temperature to rise from 20 ℃ to 80 ℃ and continuously and stably increasing the temperature to be higher than 0.5h, and then carrying out durability tests under different master cylinder preset pressures;
after the temperature is regulated to be increased from 80 ℃ to 120 ℃ and continuously stabilized for more than 0.5h, durability tests under different master cylinder preset pressures can be carried out;
after the temperature is regulated to be reduced from 120 ℃ to-40 ℃ and is continuously and stably higher than 3h, carrying out durability tests under different master cylinder preset pressures;
and (3) after the temperature is regulated to be increased from-40 ℃ to-20 ℃ and is continuously and stably higher than 2h, carrying out durability tests under different main cylinder preset pressures.
Preferably, before the control air source pushes the master cylinder to make the pressure thereof reach the preset value, the method further comprises the following steps: and automatically exhausting the air pressure pipeline system and the hydraulic control unit.
Preferably, the automatic venting comprises:
injecting brake fluid into the oil pot, starting the quantitative pumps after all the pneumatic ball valves are started, and simultaneously, controlling an air source to push the main cylinder to build pressure repeatedly and then release the pressure, and alternately performing preset times; brake fluid flows through the pneumatic pipeline system from the oil tank and the oil can respectively and finally flows into the oil tank, and the brake fluid is kept to flow circularly for a period of time.
The invention has the beneficial effects that: according to the durability test system and method for the hydraulic control unit in the automobile brake system, the air source is used as the pressure source, so that the pressure can be quickly lifted, and the reciprocating change of the pressure can be borne; in addition, the simulated wheel cylinder can bear the reciprocating change of pressure, and the consistency of the braking characteristic is more stable. And has: the device has the advantages of automatically performing exhaust treatment on the hydraulic control unit, monitoring the pressure of a system master cylinder and a wheel cylinder, providing ambient temperature, and automatically controlling the states of each electromagnetic valve and each motor of the hydraulic control unit, so that the durability test of the hydraulic control unit can be smoothly performed, and the durability test efficiency of the hydraulic control unit is improved.
Drawings
FIG. 1 is a schematic structural diagram of a durability testing system for a hydraulic control unit in an automotive brake system according to the present invention;
FIG. 2 is a schematic flow chart of a method for testing the durability of a hydraulic control unit in the automobile braking system according to the present invention.
In the figure, the meaning of each symbol is as follows:
the device comprises a gas source 1, a two-position five-way electromagnetic valve 2, a cylinder 3, an oil can 4, an oil tank 5, a master cylinder 6, a pneumatic ball valve 7-14, a pressure sensor 15-20, a simulated wheel cylinder 21-24, a hydraulic control unit 25, a proportional valve 26, a speed regulating valve 27, a constant delivery pump 28, a filter 29, a temperature control box 30, a filter 31, a silencer 32, a liquid level meter 33, a return pipeline 34, a third pipeline 35, a fourth pipeline 36, a main pipeline 37, a first pipeline 38, a second pipeline 39, a fifth pipeline 40, a sixth pipeline 41, a seventh pipeline 42 and an eighth pipeline 43.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The test items of the HCU endurance performance mainly comprise: the durability of the electromagnetic valve, the durability of the plunger pump, the high-pressure dynamic strength, the normal-temperature durability, the high-temperature durability and the low-temperature durability, and the like.
In the existing Hydraulic Control Unit (HCU) performance test system, a hydraulic pump station is adopted as a pressure source, and a real brake wheel cylinder is adopted; however, the durability test of the HCU requires many thousands of different pressure cycle tests, and one test time is as long as several hours or even tens of hours, so that the hydraulic pump station and the real brake wheel cylinder are difficult to bear such frequent pressure changes, and thus the HCU durability test device does not have the capability of testing the durability of the Hydraulic Control Unit (HCU) for a long time. The testing system provided by the invention adopts the air source as a pressure source, adopts a pressure building mode that the air cylinder pushes the main cylinder, can realize rapid pressure rise and fall, and can bear reciprocating variation of pressure; and the simulated wheel cylinder (steel cylinder) can bear the reciprocating change of pressure and has more stable braking characteristic.
Example one
As shown in fig. 1, an embodiment of the present invention provides an endurance testing system for a hydraulic control unit in an automotive brake system, including: the system comprises an air pressure providing system, an air pressure pipeline system, a measurement and control system and an environment simulation system.
The air pressure providing system comprises an air source 1, a two-position five-way electromagnetic valve 2 and an air cylinder 3 which are sequentially connected through a pipeline.
The pneumatic pipeline system comprises an oil can 4, an oil tank 5, a master cylinder 6, pneumatic ball valves 7-14, pressure sensors 15-20 and simulated wheel cylinders 21-24, and the air cylinder 3 is in pushing connection with the master cylinder 6; an overflow outlet of the oil can 4 is connected with the oil tank 5 through a return pipeline 34, an oil outlet of the oil can 4 is connected with an oil inlet of the master cylinder 6, two oil outlets of the master cylinder 6 are respectively connected with two oil inlets of the hydraulic control unit 25 through a third pipeline 35 and a fourth pipeline 36, the oil tank 5 is connected with the third pipeline 35 through a main pipeline 37 and a first pipeline 38 in sequence, the oil tank 5 is connected with the fourth pipeline 36 through a main pipeline 37 and a second pipeline 39 in sequence, and four oil outlets of the hydraulic control unit 25 are respectively connected with the oil tank 5 through a fifth pipeline 40, a sixth pipeline 41, a seventh pipeline 42 and an eighth pipeline 43; the pneumatic ball valves 7-14 are arranged on the first pipeline 38, the second pipeline 39, the third pipeline 35, the fourth pipeline 36, the fifth pipeline 40, the sixth pipeline 41, the seventh pipeline 42 and the eighth pipeline 43, the pressure sensors 15-20 are arranged on the third pipeline 35, the fourth pipeline 36, the fifth pipeline 40, the sixth pipeline 41, the seventh pipeline 42 and the eighth pipeline 43, and the simulated wheel cylinders 21-24 are arranged on the fifth pipeline 40, the sixth pipeline 41, the seventh pipeline 42 and the eighth pipeline 43.
The input port of the measurement and control system is in signal connection with all the pressure sensors 15-20, and the output port of the measurement and control system is in signal connection with all the pneumatic ball valves 7-14, the two-position five-way electromagnetic valve 2 and the hydraulic control unit 25.
The hydraulic control unit 25 and a pipeline connected with the hydraulic control unit 25 are placed in the environment simulation system, and are used for simulating the temperature of the hydraulic control unit 25 in the endurance test process.
According to the system with the structure, the air source with certain pressure is externally connected, the air cylinder connected with the air source is used for pushing the main cylinder push rod to build or reduce the pressure in the system, and the air flow speed is high, so that the pressure in the system can be quickly increased or decreased, and the condition that various pressures are required to be continuously changed in the durability test process is met; moreover, the structure that the air cylinder connected with the air source pushes the push rod of the main cylinder has stronger bearing force on pressure change, so that the air cylinder can bear multiple frequent changes of pressure; the two-position five-way valve is used for controlling the air inlet direction of an air source and comprises the processes of air inlet pressure building and air exhaust pressure reduction. The air pressure providing system provided by the invention can also comprise a pressure reducing valve which can be used for preventing overhigh pressure, and automatically reducing the pressure when the pressure is overhigh, so that the safety of the system is ensured.
The pneumatic pipeline system provided by the embodiment of the invention can provide brake fluid and different pressure environments for the test of the hydraulic control unit. The oil can is arranged above the main cylinder, the oil can is provided with the oil filling port, oil can be filled into the oil can through the oil filling port, when the oil in the oil can exceeds a preset amount, the oil can enter the return pipeline from the overflow port and flow into the oil tank, and brake fluid is recovered. The oil in the oil can automatically flow into the main cylinder through the oil outlets, when the main cylinder is pushed by the air cylinder to pressurize, the oil in the main cylinder flows through the two oil inlets of the hydraulic control unit from the two oil outlets respectively through the third pipeline and the fourth pipeline and enters the hydraulic control unit, so that brake fluid required by testing is provided for the hydraulic control unit, and in addition, the pressure required by testing is provided for the hydraulic control unit through the pressurization or depressurization of the main cylinder. Wherein, be provided with level gauge 33 in the oil tank for monitor the liquid level of oil tank. The oil in the oil tank can also enter the hydraulic control unit through the main pipeline, the first pipeline and the third pipeline, and can also enter the hydraulic control unit through the main pipeline, the second pipeline and the fourth pipeline. In the actual use process, the oil in the oil can and the oil tank can enter the hydraulic control unit through the working pipeline according to the requirement. The hydraulic control unit comprises four oil outlets and can be connected with the oil tank through a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline respectively. The simulation wheel cylinders are arranged on the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline respectively and used for simulating wheel cylinders on a real vehicle. In the invention, the simulated wheel cylinder adopts an energy accumulator steel cylinder structure, and the mechanical structure can ensure that the performance of the simulated wheel cylinder is more reliable and the pressure tolerance is stronger compared with that of a real wheel cylinder, so that the simulated wheel cylinder can bear frequent and multiple changes of pressure when multiple pressure changes are carried out on a hydraulic control unit and each pressure needs to be subjected to multiple-cycle durability tests; and the modeling of the simulated wheel cylinder of the energy accumulator steel cylinder structure is stable and single, so that the consistency of the braking characteristics can be ensured to be more stable, and the test result is ensured to be more reliable.
In the embodiment of the invention, the pressure sensors in the pneumatic pipeline system are used for acquiring pressure signals, for example, the pressure sensors arranged on the third pipeline and the fourth pipeline are used for acquiring brake hydraulic pressures at two oil inlets of the hydraulic control unit, which respectively represent the output pressure of the master cylinder; and pressure sensors arranged on the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are used for acquiring brake fluid pressures at four oil outlets of the hydraulic control unit and respectively represent the pressures in the corresponding four simulation wheel cylinders.
In the embodiment of the invention, the pneumatic ball valve in the pneumatic pipeline system is used for realizing the on-off of the pipeline by controlling the switch state so as to obtain different loops. For example, the on-off of the first pipeline can be realized by controlling the on-off state of a pneumatic ball valve arranged on the first pipeline, when the pneumatic ball valve is in the on state, the first pipeline is communicated, and oil can flow through the first pipeline and enter the third pipeline; when the pneumatic ball valve is in a closed state, the first pipeline is disconnected, and oil cannot flow through the first pipeline to enter the third pipeline.
The measurement and control system provided by the embodiment of the invention can comprise an industrial personal computer, wherein the industrial personal computer can be connected with a pressure sensor to acquire a pressure signal in the system, process the acquired pressure signal, and send a control instruction according to a result obtained by processing the pressure signal to control the states of a pneumatic ball valve and a two-position five-way electromagnetic valve or control the working states of a pump and an electromagnetic valve in a hydraulic control unit.
In the practical application process, a test program can be preset in the industrial personal computer according to the practical test process, for example, the output pressure of the air source and the states of the pneumatic ball valves can be adjusted according to different test items of the hydraulic control unit, so that a test loop is changed. And the signals of the corresponding pressure sensor and the corresponding current sensor are collected in the test process, and are recorded and analyzed, so that the performance indexes of the hydraulic control unit under different conditions are reflected.
For example, the test procedure is to perform a durability test first, and then perform a functionality test and a normal braking test after each durability test. In the actual endurance test process, the temperature is changed to a first value, then the pressure is changed to a first value, the endurance test is carried out for a specified number of times under the first temperature and first pressure condition, then the pressure is changed to a second value, the endurance test is carried out for a specified number of times under the first temperature and second pressure condition, and the like, and the endurance test is carried out for a specified number of times under the first temperature and nth pressure condition; changing the temperature to a second temperature according to a preset program, changing the pressure to a first value at the temperature, carrying out the durability test for a specified time under the conditions of the second temperature and the first pressure, then changing the pressure to a second value, carrying out the durability test for the specified time under the conditions of the second temperature and the second pressure, and so on, and carrying out the durability test for the specified time under the conditions of the second temperature and the nth pressure; and the like, completing the durability test for the specified times under the conditions of the m-th temperature and the n-th pressure.
Therefore, the system provided by the invention can realize remote control of the system and automatic control of the test of the hydraulic control unit, thereby greatly improving the working efficiency.
In the embodiment of the invention, the environment simulation system can be a temperature control box 30, the temperature in the temperature control box can be controlled by an industrial personal computer, and the temperature can be adjusted at will between-40 ℃ and 120 ℃. The performance parameters of the hydraulic control unit under different environmental temperatures can be tested by changing the temperature of the temperature control box.
In a preferred embodiment of the present invention, the air pressure providing system further comprises a proportional valve 26 and a speed regulating valve 27, the proportional valve 26 is located on the connecting pipeline between the air source 1 and the two-position five-way solenoid valve 2, and the speed regulating valve 27 is located on the connecting pipeline between the two-position five-way solenoid valve 2 and the air cylinder 3.
The proportional valve is used for controlling the flow of the air source, and the speed regulating valve is used for controlling the flow rate of the air source.
The flow and the speed of the air source can be better controlled by adopting the proportional valve and the speed regulating valve, so that the output pressure of the air source is controlled, the air cylinder can control the pressure of the main cylinder more accurately in the process of pushing the main cylinder to build pressure or reduce pressure, the pressure control in the process of testing the durability of the hydraulic control unit is more accurate, and the obtained test result is higher in accuracy and more reliable.
The air pressure providing system provided by the embodiment of the invention can further comprise a filter 31 and a silencer 32, wherein the filter 31 can be used for filtering and purifying air in the pipeline, and the silencer 32 can be used for reducing or eliminating noise in the pipeline so as to avoid noise pollution.
In a preferred embodiment of the present invention, the pneumatic ball valves 9 and 10 and the pressure sensors 15 and 16 are provided in the third and fourth lines 35 and 36 in order from the master cylinder 6 to an oil inlet of the hydraulic control unit 25.
In the practical application process, only when the pneumatic ball valve is in an open state, the pipeline is in a communicated state, the oil flows from the main cylinder to the oil inlet of the hydraulic control unit, and at the moment, the pressure of the brake fluid at the oil inlet, namely the pressure of the main cylinder, is detected, so that the significance is achieved.
In one embodiment of the present invention, pressure sensors 17-20, simulated wheel cylinders 21-24 and pneumatic ball valves 11-14 are arranged on the fifth pipeline 40, the sixth pipeline 41, the seventh pipeline 42 and the eighth pipeline 43 in sequence from the oil outlet of the hydraulic control unit 25 to the oil tank 5.
By adopting the structure, the simulation wheel cylinder is used for simulating the wheel cylinder of a real vehicle, so after brake fluid enters the hydraulic control unit, the four oil outlets are sealed by using the simulation wheel cylinder for testing the performance index of the brake fluid, and meanwhile, pressure sensors are required to test the pressure of the brake fluid at the four oil outlets and respectively correspond to the pressure in the simulation wheel cylinder. Therefore, in the present embodiment, the pressure sensor is disposed at a position close to the oil outlet.
In another embodiment of the invention, the main line 37 is provided with a fixed displacement pump 28 and a filter 29, the filter 29 being arranged close to the tank 5.
The constant delivery pump can be connected with the industrial personal computer, and oil liquid with constant flow rate is pumped into the pipeline from the oil tank under the control of the industrial personal computer.
Through setting up the filter, can filter the impurity of cleaing away in the fluid, go into the system with fluid pump by the constant delivery pump again, can protect the components and parts among system and the hydraulic control unit.
The working principle and process of the endurance testing system for the hydraulic control unit in the automobile braking system provided by the invention are described below with reference to the accompanying drawings.
First, an automatic exhaust process.
The industrial personal computer controls all the pneumatic ball valves to be opened completely and controls the quantitative pump to work, oil enters a main pipeline 37, a first pipeline 38 and a second pipeline 39 from the oil tank through the filter, and after passing through the pneumatic ball valves 7 and 8 in the first pipeline 38 and the second pipeline 39 respectively, the oil enters a third pipeline 35 from the first pipeline 38 and enters a fourth pipeline 36 from the second pipeline 39.
After the oil is filled into the oil pot to a certain height, the oil can automatically flow into the main cylinder through the oil outlets, when the main cylinder is pushed by the air cylinder to pressurize, the oil in the main cylinder respectively enters the third pipeline and the fourth pipeline from the two oil outlets, meanwhile, the air source is controlled to push the main cylinder to build pressure and then release pressure, and preset times are carried out alternately, so that residual gas in the pipeline connected with the oil outlets of the main cylinder is taken away by the oil.
After entering a third pipeline 35 and a fourth pipeline 36, oil in the oil tank and oil in the oil kettle respectively sequentially pass through pneumatic ball valves 9 and 10 and pressure sensors 15 and 16, then enter a hydraulic control unit of the temperature control box through an oil inlet, respectively enter a fifth pipeline 40, a sixth pipeline 41, a seventh pipeline 42 and an eighth pipeline 43 from four oil outlets of the hydraulic control unit, respectively sequentially pass through pressure sensors 17-20, simulation wheel cylinders 21-24, pneumatic ball valves 11-14 in the four pipelines, and finally enter the oil tank with air remained in an oil carrying system, so that the purpose of exhausting is achieved.
And secondly, a durability test process.
The durability test procedure can be performed as follows:
the method comprises the steps of firstly making an endurance test distribution table, compiling the endurance test distribution table into corresponding programs according to certain logic, presetting the corresponding programs in an industrial personal computer, automatically executing the programs by the industrial personal computer, and testing corresponding times by adopting a set test period according to the combination conditions of pressure and temperature in the endurance test distribution table. Meanwhile, in order to automatically test the durability of each test sample of the hydraulic control unit, the durability test program of each test sample can be preset in the industrial personal computer, and after the test system prepares the durability test condition, the industrial personal computer only needs to control the states of each electromagnetic valve and each motor in the hydraulic control unit according to the test samples, and then the durability test can be automatically carried out on the hydraulic control unit.
The endurance test distribution table comprises an environmental preset temperature of the endurance test, a main cylinder preset pressure, a test period and test times. In the embodiment of the invention, the environment preset temperature is-40-120 ℃, and the main cylinder preset pressure is 3-22 MPa; wherein, a plurality of preset test times and test periods are set under each combination condition.
As an example, the endurance test distribution table may be as follows:
in the distribution table of the endurance tests shown in the above table, two different test times are used at the same temperature under 3MPa, for example, 1607 tests are respectively performed under the conditions of 3MPa and 20 ℃, the test period is 2s and 552 tests, and the test period is 4 s. In this way, more accurate determination of the reliability of the test data can be facilitated.
In each durability test, it can be performed as follows:
using an industrial control machine to control an air source to push a main cylinder to enable the pressure of the main cylinder to reach a preset value; controlling an environment simulation system to change the environment temperature of the hydraulic control unit to reach a preset value; specifically, the pneumatic ball valves 9 and 10 are controlled to be opened, the rest pneumatic ball valves are closed, the control air source pushes the main cylinder and the pressure sensor to accurately control the pressure of the main cylinder (active pressure building process), and the temperature of the temperature control box is remotely controlled through the industrial personal computer to reach the target temperature.
And then according to the test sample, the industrial personal computer controls the states of each electromagnetic valve and each motor in the hydraulic control unit according to a preset test program, and carries out durability test on the hydraulic control unit.
Pressure sensor signals on two paths of oil inlet pipelines of the hydraulic control unit and pressure sensor signals on a pipeline where four paths of simulation wheel cylinders are located are collected and sent to the industrial personal computer, and the industrial personal computer analyzes the signals and is used for controlling the pressure of the main cylinder.
In the embodiment of the invention, after the durability test is finished once, the 'functionality test' and the 'conventional brake test' are carried out.
After the durability test under the single temperature and pressure combination condition is finished, the system can give an alarm for humming, and a tester is prompted to start the system to perform the functional test and the conventional brake test. In the test, the tester monitors the data, judges whether the tested sample meets the requirements or not, stores the pressure data in the function test process, and can manually finish the test if a problem occurs. After the functional test and the conventional brake test are completed, the temperature and pressure conditions for the durability test are changed according to a preset program, and the pressure and temperature changes can be monitored through a sensor. Thus, the durability test is completed under different pressure and temperature conditions by changing the pressure and the temperature. As an example, the durability test may be performed under different combination conditions, for example, by varying the temperature and pressure as follows:
adjusting the initial temperature to 20 ℃, and carrying out durability tests under different master cylinder preset pressures;
adjusting the temperature to rise from 20 ℃ to 80 ℃ and continuously and stably increasing the temperature to be higher than 0.5h, and then carrying out durability tests under different master cylinder preset pressures;
after the temperature is regulated to be increased from 80 ℃ to 120 ℃ and continuously stabilized for more than 0.5h, durability tests under different master cylinder preset pressures can be carried out;
after the temperature is regulated to be reduced from 120 ℃ to-40 ℃ and is continuously and stably higher than 3h, carrying out durability tests under different master cylinder preset pressures;
and (3) after the temperature is regulated to be increased from-40 ℃ to-20 ℃ and is continuously and stably higher than 2h, carrying out durability tests under different main cylinder preset pressures.
And thirdly, a functional test process.
The functionality test can be performed as follows:
the master cylinder is pressurized to 3MPa/15MPa, and then the function testing action is formally started after the time delay of 3400 ms. 10ms of pressure reducing time, 400ms of pressure reducing and maintaining time and 3/1 of pressure reducing steps each time, starting a pressurizing process after delaying 100ms, 20ms of pressure increasing time, 400ms of pressure increasing and maintaining time and 10/6 of pressure increasing steps each time, starting a motor when a pressure reducing valve starts to act, and lasting 5000 ms. And after the test is finished, storing each pressure data.
And fourthly, performing a conventional brake test process.
The conventional braking test can be performed as follows:
the master cylinder pressure is generally set to 15MPa for 3000ms, the master cylinder is depressurized, and the master cylinder pressurization time is recorded. And recording the response time when the wheel cylinder reaches a certain pressure value.
According to the functional test and the conventional brake test, in the actual operation process, the main cylinder can be pressurized and decompressed by the air source to push the main cylinder to complete, so that the pressurizing and decompressing processes can be quicker.
In addition, since durability tests under various combinations of temperature and pressure are required, and tests under each combination require multiple cycles, multiple functional tests and conventional braking tests, i.e., multiple operations, are required. Therefore, the test system provided by the embodiment of the invention not only can test whether the durability, the functionality and the conventional braking of the hydraulic control unit meet the requirements, but also has good durability, so that the test on the durability, the functionality and the conventional braking of the hydraulic control unit is supported.
Example two
As shown in fig. 2, an embodiment of the present invention provides a method for testing durability of a hydraulic control unit in an automotive brake system, including:
step one, controlling an environment simulation system to change the environment temperature of a hydraulic control unit to reach a preset value;
controlling an air source to push the main cylinder to enable the pressure of the main cylinder to reach a preset value;
controlling the states of each electromagnetic valve and each motor in the hydraulic control unit according to the test sample, and testing the durability of the electromagnetic valves and the motors;
acquiring pressure sensor signals on two inlet pipelines of the hydraulic control unit and pressure sensor signals on pipelines where four analog wheel cylinders are located;
and step five, repeating the steps one to four, and completing the durability test of the hydraulic control unit under different master cylinder preset pressure and environment preset temperature combination conditions, wherein the test is carried out according to preset test times and test periods under each combination condition.
The method provided by the invention can be completed by using the test system in the first embodiment.
Wherein the environment preset temperature is-40 ℃ to 120 ℃, and the main cylinder preset pressure is 3MPa to 22 MPa; wherein, a plurality of preset test times and test periods are set under each combination condition.
In a preferred embodiment of the present invention, the durability test of the hydraulic control unit at different master cylinder preset pressures and ambient preset temperatures is performed as follows:
adjusting the initial temperature to 20 ℃, and carrying out durability tests under different master cylinder preset pressures;
adjusting the temperature to rise from 20 ℃ to 80 ℃ and continuously and stably increasing the temperature to be higher than 0.5h, and then carrying out durability tests under different master cylinder preset pressures;
after the temperature is regulated to be increased from 80 ℃ to 120 ℃ and continuously stabilized for more than 0.5h, durability tests under different master cylinder preset pressures can be carried out;
after the temperature is regulated to be reduced from 120 ℃ to-40 ℃ and is continuously and stably higher than 3h, carrying out durability tests under different master cylinder preset pressures;
and (3) after the temperature is regulated to be increased from-40 ℃ to-20 ℃ and is continuously and stably higher than 2h, carrying out durability tests under different main cylinder preset pressures.
In another preferred embodiment of the present invention, before the control air source pushes the master cylinder to make its pressure reach the preset value, the method further comprises the following steps: and automatically exhausting the air pressure pipeline system and the hydraulic control unit.
Further, the automatic exhaust includes:
injecting brake fluid into the oil pot, starting the quantitative pumps after all the pneumatic ball valves are started, and simultaneously, controlling an air source to push the main cylinder to build pressure repeatedly and then release the pressure, and alternately performing preset times; brake fluid flows through the pneumatic pipeline system from the oil tank and the oil can respectively and finally flows into the oil tank, and the brake fluid is kept to flow circularly for a period of time.
The system and the method for testing the durability of the hydraulic control unit in the automobile braking system have the following characteristics that:
the performance test bench in the prior art adopts a hydraulic pump station as a pressure source and is difficult to bear repeated pressure change.
The performance test bench in the prior art adopts the vehicle brake wheel cylinder, and is difficult to bear pressure change which reciprocates for multiple times.
The system and the method provided by the invention have the function of automatically exhausting the hydraulic control unit, and the influence of gas in the hydraulic control unit on the pressure characteristic in the test process is avoided.
The system and the method provided by the invention can simulate the working conditions possibly suffered by the hydraulic control unit under different pressures and different temperatures so as to carry out the durability test of full working condition and full coverage.
According to the system and the method provided by the invention, the structure that the oil in the oil can flows back to the oil tank meets the requirement that a hydraulic control unit needs a large amount of brake fluid in the test. The structure of the invention not only enables the brake pipeline to be filled with oil, but also can filter brake fluid, so that impurities in the pipeline are deposited at the bottom of the oil tank.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A durability test system of a hydraulic control unit in an automobile brake system, comprising: the system comprises an air pressure providing system, an air pressure pipeline system, a measurement and control system and an environment simulation system;
the air pressure providing system comprises an air source, a two-position five-way electromagnetic valve and an air cylinder which are sequentially connected through a pipeline;
the pneumatic pipeline system comprises an oil can, an oil tank, a main cylinder, a pneumatic ball valve, a pressure sensor and a simulation wheel cylinder, and the air cylinder is connected with the main cylinder in a pushing mode; an overflow outlet of the oil can is connected with the oil tank through a return pipeline, an oil outlet of the oil can is connected with an oil inlet of the main cylinder, two oil outlets of the main cylinder are respectively connected with two oil inlets of the hydraulic control unit through a third pipeline and a fourth pipeline, the oil tank is connected with the third pipeline through a main pipeline and a first pipeline in sequence, the oil tank is connected with the fourth pipeline through a main pipeline and a second pipeline in sequence, and four oil outlets of the hydraulic control unit are respectively connected with the oil tank through a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline; the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with pneumatic ball valves, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with the pressure sensors, and the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are all provided with the simulation wheel cylinders;
the input port of the measurement and control system is in signal connection with all the pressure sensors, and the output port of the measurement and control system is in signal connection with all the pneumatic ball valves, the two-position five-way electromagnetic valve and the hydraulic control unit;
the environment simulation system is provided with the hydraulic control unit and a pipeline connected with the hydraulic control unit and is used for simulating the temperature of the hydraulic control unit in the endurance test process;
the air pressure providing system further comprises a proportional valve and a speed regulating valve, the proportional valve is located on a connecting pipeline of the air source and the two-position five-way electromagnetic valve, and the speed regulating valve is located on a connecting pipeline of the two-position five-way electromagnetic valve and the air cylinder.
2. The system for testing the durability of a hydraulic control unit in an automobile brake system according to claim 1, wherein the pneumatic ball valve and the pressure sensor are provided in order from the master cylinder to an oil inlet of the hydraulic control unit on the third line and the fourth line.
3. The system for testing the durability of a hydraulic control unit in an automobile brake system according to claim 1, wherein a pressure sensor, a simulation wheel cylinder and a pneumatic ball valve are sequentially arranged on the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline from an oil outlet of the hydraulic control unit to the oil tank.
4. The system for testing the durability of a hydraulic control unit in an automobile brake system according to claim 1, wherein a fixed displacement pump and a filter are provided on the main line, and the filter is provided near the oil tank.
5. A method for testing the endurance performance of a hydraulic control unit in a brake system of an automobile, using the test system according to any one of claims 1 to 4, the method comprising:
controlling an environment simulation system to change the environment temperature of the hydraulic control unit to reach a preset value;
controlling an air source to push the main cylinder to enable the pressure of the main cylinder to reach a preset value;
controlling the states of each electromagnetic valve and each motor in the hydraulic control unit according to the test sample, and carrying out durability test on the hydraulic control unit;
collecting pressure sensor signals on two inlet pipelines of the hydraulic control unit and pressure sensor signals on pipelines of four analog wheel cylinders;
repeating all the steps to finish the durability test of the hydraulic control unit under different master cylinder preset pressure and environment preset temperature combination conditions, wherein the test is carried out according to preset test times and test periods under each combination condition;
before the control air source pushes the main cylinder to enable the pressure of the main cylinder to reach a preset value, the method further comprises the following steps: automatically exhausting the air pressure pipeline system and the hydraulic control unit;
the automatic exhaust includes:
injecting brake fluid into the oil pot, starting the quantitative pumps after all the pneumatic ball valves are started, and simultaneously, controlling an air source to push the main cylinder to build pressure repeatedly and then release the pressure, and alternately performing preset times; brake fluid flows through the pneumatic pipeline system from the oil tank and the oil can respectively and finally flows into the oil tank, and the brake fluid is kept to flow circularly for a period of time.
6. The method for testing the durability of the hydraulic control unit in the automobile brake system according to claim 5, wherein the environment preset temperature is-40 ℃ to 120 ℃, and the master cylinder preset pressure is 3MPa to 22 MPa; wherein, a plurality of preset test times and test periods are set under each combination condition.
7. The method for testing the durability of the hydraulic control unit in the automotive brake system according to claim 6, wherein the durability test of the hydraulic control unit at different master cylinder preset pressures and ambient preset temperatures is performed as follows:
adjusting the initial temperature to 20 ℃, and carrying out durability tests under different master cylinder preset pressures;
adjusting the temperature to rise from 20 ℃ to 80 ℃ and continuously and stably increasing the temperature to be higher than 0.5h, and then carrying out durability tests under different master cylinder preset pressures;
adjusting the temperature to rise from 80 ℃ to 120 ℃ and continuously and stably increasing the temperature to be higher than 0.5h, and then carrying out durability tests under different master cylinder preset pressures;
after the temperature is regulated to be reduced from 120 ℃ to-40 ℃ and is continuously and stably higher than 3h, carrying out durability tests under different master cylinder preset pressures;
and (3) after the temperature is regulated to be increased from-40 ℃ to-20 ℃ and is continuously and stably higher than 2h, carrying out durability tests under different main cylinder preset pressures.
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