CN111157227A

CN111157227A - Brake booster and master cylinder comprehensive test device and test control method

Info

Publication number: CN111157227A
Application number: CN202010000916.2A
Authority: CN
Inventors: 刘金刚; 胡余良; 孟步敏; 傅兵; 肖培杰
Original assignee: Foshan Yiwei Brake Technology Co Ltd
Current assignee: Foshan Yiwei Brake Technology Co Ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-05-15
Anticipated expiration: 2040-01-02
Also published as: CN111157227B

Abstract

The application relates to a brake booster and master cylinder comprehensive test device and a test control method. The brake booster and the master cylinder comprehensive testing device provide brake driving force for a brake master cylinder in a tested device through a pedal input unit, a controller opens a certain path of brake circuit through a control oil circuit switching unit, then the brake booster in the tested device is controlled, the tested device starts to provide brake hydraulic pressure to a load simulation unit, the control unit controls the load simulation unit to work, the load simulation unit provides load torque, and at the moment, whether the currently selected brake circuit can be effectively braked can be judged by acquiring the running speed of the load simulation unit measured by a rotating speed sensor and the oil pressure output by the oil circuit switching unit collected by a pressure sensor. The comprehensive testing device can detect various types of boosters, does not need various devices to measure respectively, and is high in testing efficiency and low in cost.

Description

Brake booster and master cylinder comprehensive test device and test control method

Technical Field

The invention relates to the technical field of brake system testing, in particular to a brake booster and master cylinder comprehensive testing device and a testing control method.

Background

The statements herein merely provide background information related to the present application and may not necessarily constitute prior art.

The brake booster and the brake master cylinder are important components of a vehicle brake system. The brake booster is a brake boosting device for reducing pedal force of a driver, the brake master cylinder is a device for sending brake fluid with certain pressure to each wheel through a brake pipeline, the quality and the performance of the brake booster directly influence the safety and the reliability of a vehicle in a braking process, and the brake booster plays a vital role in vehicle driving.

At present, a performance test bed related to a vehicle brake booster and a brake master cylinder mainly adopts a principle method of electromechanical gas-liquid integration, but the electromechanical control technology level is different, the bench schemes are numerous, most tests on the brake booster and the brake master cylinder in the traditional technology are personalized test platforms formulated according to models, the universality is poor, the performances of the brake booster and the brake master cylinder need to be tested respectively before assembly, and the test contents mainly take the tightness, the input and output characteristics and the oil pressure release time as the main contents to ensure the factory-leaving quality of the brake booster and the brake master cylinder. After the test is passed, the brake booster-brake master cylinder assembly is required to be tested, and the vehicle can be mounted for use after the test is passed. Therefore, in a production workshop, the detection devices are more and complicated, the cost is high, and the test efficiency is low.

Disclosure of Invention

Therefore, it is necessary to provide a comprehensive test device and a test control method for a brake booster and a master cylinder, which can realize assembly test and independent part test of the brake booster and the brake master cylinder, are suitable for various types of boosters and master cylinders, and have low cost and high test efficiency, in order to solve the problems that the tests of the brake booster and the brake master cylinder in the conventional technology need various devices and are carried out for many times, and the cost is high and the test efficiency is low.

The embodiment of the invention provides a brake booster and master cylinder comprehensive testing device, which comprises:

a pedal input unit for converting a pedaling force into a driving force of a device under test to cause the device under test to provide a braking hydraulic pressure; the device to be tested comprises a brake booster and a brake master cylinder;

the input ends of the oil path switching unit are respectively used for correspondingly communicating with the outlets of the brake circuits of the brake master cylinder in the tested device;

the liquid inlet of the load simulation unit is communicated with the output port of the oil way switching unit;

the rotating speed sensor is used for acquiring the rotating speed of the load simulation unit;

the pressure sensor is arranged at the output port of the oil path switching unit and used for detecting the oil pressure of the output port of the oil path switching unit;

and the control unit is respectively and electrically connected with the control end of the oil path switching unit, the control end of the load simulation unit, the rotating speed sensor and the pressure sensor, and is also used for being electrically connected with a brake power-assisted controller in the tested device.

According to the comprehensive test device for the brake booster and the master cylinder, the brake driving force is provided for the brake master cylinder in the tested device through the pedal input unit, when the driving force of the pedal input unit is not zero, the controller opens a certain path of brake loop through the control oil path switching unit, then the tested device consisting of the brake master cylinder and the brake booster starts to provide the brake hydraulic pressure to the load simulation unit through controlling the brake booster in the tested device, the load simulation unit is used for simulating the load torque generated by the rotation of the wheel during the running of the vehicle and the braking action of the wheel cylinder on the wheel, the control unit provides the load torque through controlling the load simulation unit to work, at the moment, whether the currently selected brake loop can be effectively braked can be judged through acquiring the running speed of the load simulation unit measured by the rotating speed sensor and the oil pressure output by the oil path switching unit collected by the pressure sensor, the effectiveness of other brake circuits can be detected by controlling the oil circuit switching unit to switch to other brake circuits and repeating the test, and if all the brake circuits are effective, the brake master cylinder and the brake booster in the tested device are qualified, and the assembly of the brake master cylinder and the brake booster is also qualified. The application is that brake booster and master cylinder comprehensive testing device that the embodiment provided, compare in traditional testing device, have the universality, can be used for detecting various types of booster, only need with the control unit connect the booster can, and this device, through keeping one of them part in the qualified brake booster-brake master cylinder assembly, replace brake booster and the brake master cylinder in the device tested in turn, realize the detection to the single device qualification nature of test brake booster and brake master cylinder, also can test whether qualified brake booster-brake master cylinder assembly, it measures respectively to need not multiple device, the efficiency of software testing is high, and is with low costs.

In one embodiment, the brake booster and master cylinder integrated test apparatus further includes:

and the liquid outlet of the oil pressure fluctuation simulation unit is communicated with the output port of the oil way switching unit.

And a force sensor for detecting a feedback force of the pedal input unit.

In one embodiment, the oil path switching unit includes:

the input ports of the electromagnetic directional valves are respectively used for being communicated with the brake circuits of the tested device in a one-to-one correspondence manner; the output port of the electromagnetic directional valve is respectively communicated with the oil pressure fluctuation simulation unit and the load simulation unit; and the control end of the electromagnetic directional valve is electrically connected with the control unit.

In one embodiment, the brake master cylinder of the tested device comprises a first brake circuit and a second brake circuit, a first input port of the electromagnetic directional valve is communicated with the first brake circuit of the brake master cylinder in the tested device, and a second input port of the electromagnetic directional valve is communicated with the second brake circuit of the brake master cylinder in the tested device;

the oil path switching unit further includes:

a first oil tank;

one end of the first switch valve is communicated with the first oil tank, and the other end of the first switch valve is communicated with the first brake loop;

a second oil tank;

one end of the second switch valve is communicated with the second oil tank, and the other end of the second switch valve is communicated with the second brake circuit;

the pressure sensor is arranged at an output port of the electromagnetic directional valve.

In one embodiment, the oil pressure fluctuation simulation unit includes:

the input end of the first motor is electrically connected with the control unit;

the hydraulic pump is mechanically connected with an output shaft of the first motor;

the third oil tank is communicated with the output end of the hydraulic pump;

an inlet of the first one-way valve is communicated with the hydraulic pump, an outlet of the first one-way valve is communicated with an output port of the electromagnetic directional valve, and an outlet of the first one-way valve is also communicated with a liquid inlet of the load simulation unit;

and one end of the proportional overflow valve is communicated with the outlet of the first check valve, and the other end of the proportional overflow valve is communicated with the third oil tank.

In one embodiment, the pedal input unit includes:

a pedal;

the input rod is mechanically connected with the pedal at one end and is mechanically connected with the brake master cylinder in the tested device at the other end;

the force sensor is disposed inside the input lever.

In one embodiment, the load simulation unit includes:

a brake caliper;

a wheel;

the brake caliper piston is clamped on the brake caliper, a hydraulic cavity is formed by the brake caliper piston and the brake caliper in a surrounding mode, the hydraulic cavity is used for storing hydraulic oil output by the electromagnetic directional valve, and the brake caliper is arranged corresponding to a wheel and used for clamping the wheel during braking;

the second motor is electrically connected with the control unit;

the rotation speed sensor is used for measuring the rotation speed of the wheel.

In one embodiment, the control unit comprises:

the output end of the oil path switching unit controller is respectively and electrically connected with the electromagnetic directional valve, the first switch valve and the second switch valve;

the output end of the oil pressure fluctuation unit controller is respectively and electrically connected with the first motor and the proportional overflow valve;

the output end of the load motor controller is electrically connected with the second motor;

and the output end of the master controller is respectively and electrically connected with the input end of the oil path switching unit controller, the input end of the oil pressure fluctuation unit controller and the input end of the oil pressure fluctuation unit controller, and the master controller is also in communication connection with the pressure sensor, the rotating speed sensor and the force sensor.

A brake booster and master cylinder comprehensive test control method comprises the following steps:

when the pedal displacement of the pedal input unit is not 0, controlling a brake booster in a tested device to work, wherein the tested device comprises the brake booster and a brake master cylinder which are connected in a matching manner; the pedal input unit is used for converting the treading force into the driving force of the tested device and enabling the tested device to provide brake hydraulic pressure;

the output port of the control oil path switching unit is communicated with one path of brake circuit of a brake main cylinder in the tested device; wherein, each input end of the oil path switching unit is respectively used for correspondingly communicating with each brake circuit outlet of a brake main cylinder in the tested device;

controlling the load simulation unit to provide load torque;

acquiring the rotating speed of a load simulation unit acquired by a rotating speed sensor;

acquiring oil pressure of an output port of the oil path switching unit, which is acquired by a pressure sensor, wherein the pressure sensor is arranged at the output port of the oil path switching unit;

and judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil way switching unit.

In one embodiment, the step of controlling the load simulation unit to provide the load torque comprises:

controlling a second motor to work, wherein the second motor is used for driving the wheels to rotate so as to provide load torque;

the step of acquiring the rotating speed of the load simulation unit acquired by the rotating speed sensor comprises the following steps:

acquiring the rotating speed of a wheel acquired by a rotating speed sensor;

the step of judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil path switching unit comprises the following steps of:

if n is less than or equal to n₀And P is_n+1-P_n≤P₀If so, judging that the tested device is qualified;

where n is the second motor speed, n₀Is a second motor speed threshold, P_n+1The oil pressure at the output port of the oil path switching unit at the time n +1, P_nOil pressure at output port of oil passage switching unit at n-th time, P₀Is the oil pressure difference threshold;

the load simulation unit comprises a wheel, a second motor, a brake caliper and a brake caliper piston, the brake caliper and the brake caliper piston surround to form a hydraulic cavity, the hydraulic cavity is used for storing hydraulic oil at an output port of the oil path switching unit, the brake caliper piston is clamped on the brake caliper, and the brake caliper piston, the brake caliper and the brake caliper are arranged corresponding to the wheel and used for clamping the wheel during braking.

In one embodiment, the step of acquiring the oil pressure of the output port of the oil path switching unit collected by the pressure sensor further includes:

controlling the oil pressure fluctuation simulation unit to output the changed oil pressure to the output port of the oil way switching unit;

acquiring feedback force acquired by a force sensor, wherein the force sensor is used for detecting the feedback force of the pedal input unit;

and judging whether the tested device is qualified or not according to the rotating speed, the oil pressure of the output port of the oil path switching unit and the feedback force.

In one embodiment, the step of judging whether the tested device is qualified according to the rotating speed, the oil pressure of the output port of the oil path switching unit and the feedback force comprises the following steps:

if n is less than or equal to n₀And P is_n+1-P_n≤P₀And F is_n+1-F_n≤F₀If so, judging that the tested device is qualified;

wherein, F_n+1Feedback force, F, acquired by the sensor at time n +1_nFeedback force, F, collected for the force sensor at time n₀Is a feedback force difference threshold.

In one embodiment, the method for comprehensively testing and controlling the brake booster and the master cylinder, wherein the step of judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil path switching unit comprises the following steps of:

obtaining the oil pressure rising time and the oil return time of the brake circuit according to the oil pressure of the output port of the oil path switching unit;

if T₁≤T₀And T₂≤T₀If yes, judging that the tested device is qualified;

wherein, T₁For oil pressure rise time, T₀Is a first time threshold, T₂For oil return time, T₀' is a second time threshold.

controlling the load simulation unit to work;

A test method of the brake booster and master cylinder comprehensive test device is characterized by comprising the following steps:

connecting the pedal input unit with a brake master cylinder in a tested device;

correspondingly communicating each input end of the oil path switching unit with each brake loop outlet of a brake main cylinder in a tested device respectively;

communicating a liquid inlet of the load simulation unit with an output port of the oil way switching unit;

the control unit is respectively and electrically connected with a brake booster, a control end of an oil way switching unit, a control end of a load simulation unit, a rotating speed sensor and a pressure sensor in the tested device; the pressure sensor is arranged at an output port of the oil path switching unit and used for detecting the oil pressure of the output port of the oil path switching unit; the rotating speed sensor is used for acquiring the rotating speed of the load simulation unit;

providing a driving force to the master cylinder through the pedal input unit;

operating the control unit to work and testing the tested device;

alternately replacing a first part and a second part in the tested device to form a new tested device, and testing the new tested device;

the first component is a brake master cylinder, and the second component is a brake booster; or the first component is a brake booster and the second component is a brake master cylinder.

Drawings

FIG. 1 is a schematic structural diagram of a brake booster and master cylinder integrated test device in one embodiment;

FIG. 2 is a schematic structural view of a brake booster and master cylinder comprehensive test device in another embodiment;

FIG. 3 is a schematic diagram of a controller of an oil pressure fluctuation unit according to an embodiment;

FIG. 4 is a schematic flow chart illustrating a method for controlling a brake booster and a master cylinder during a comprehensive test according to an embodiment;

FIG. 5 is a schematic flow chart illustrating a method for integrated testing of a brake booster and a master cylinder according to one embodiment;

FIG. 6 is a schematic flow chart illustrating a brake booster and master cylinder combination test control method according to another embodiment;

FIG. 7 is a block diagram showing the construction of a brake booster and master cylinder integrated test control apparatus according to an embodiment;

FIG. 8 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In one aspect, an embodiment of the present invention provides a brake booster and master cylinder comprehensive testing apparatus, including:

a pedal input means 10 for converting a tread force into a driving force of the device under test 70 and causing the device under test 70 to supply a brake hydraulic pressure; the device under test 70 includes a brake booster and a brake master cylinder;

the input ends of the oil path switching unit 20 are respectively used for being correspondingly communicated with the brake circuit outlets of the brake master cylinder in the tested device 70;

the liquid inlet of the load simulation unit 30 is communicated with the output port of the oil path switching unit 20;

the rotating speed sensor 40, the rotating speed sensor 40 is used for collecting the rotating speed of the load simulation unit 30;

a pressure sensor 50, the pressure sensor 50 being disposed at an output port of the oil path switching unit 20, the pressure sensor 50 being configured to detect an oil pressure at the output port of the oil path switching unit 20;

and the control unit is electrically connected with the control end of the oil path switching unit 20, the control end of the load simulation unit 30, the rotating speed sensor 40 and the pressure sensor 50, and is also used for being electrically connected with a brake power-assisted controller in the tested device 70.

The oil path switching unit 20 is configured to select one of the brake circuits of each master cylinder to output brake fluid to drive the load simulation unit 30 to perform a braking operation. The load simulation unit 30 is used for simulating a load torque generated when the wheel 32 rotates and a device in which the wheel cylinder performs a braking action on the wheel 32. The pressure sensor 50 is used to measure the oil pressure at the output port of the oil path switching unit 20, which reflects the oil pressure of the brake fluid output from the selected brake circuit, at the output port of the oil path switching unit 20. The rotation speed of the load simulator 30 is the rotation speed of the module simulating the load torque of the wheel 32 in the load simulator 30, and may be, for example, the rotation speed of the wheel 32, or the rotation speed of a disk or a rotating shaft. The control unit is a device having functions of information acquisition, data processing, and control command transmission, and for example, the control unit may be an industrial personal computer or the like, or a device including various processors and logic devices.

Specifically, the brake driving force is provided to the brake master cylinder in the device under test 70 through the pedal input unit 10, when the driving force of the pedal input unit 10 is not zero, the controller opens a certain brake circuit through the control oil path switching unit 20, and then the brake booster in the device under test 70 is controlled, so that the device under test 70 consisting of the brake master cylinder and the brake booster starts to provide the brake hydraulic pressure to the load simulation unit 30, the load simulation unit 30 is used for simulating the load torque generated by the rotation of the wheel 32 and the braking action of the wheel cylinder on the wheel 32 when the vehicle runs, the control unit provides the load torque by controlling the operation of the load simulation unit 30, and at this time, the operating speed of the load simulation unit 30 measured by the rotation speed sensor 40 and the oil pressure output by the oil path switching unit 20 collected by the pressure sensor 50, that is, namely, the input and output characteristics of the brake booster-brake master cylinder assembly are, it can be determined whether the currently selected brake circuit is effective. Further, the effectiveness of other brake circuits can be detected by controlling the oil path switching unit 20 to switch to other brake circuits and repeating the test, and if each brake circuit is effective, it indicates that the brake master cylinder and the brake booster in the tested device 70 are both qualified, and the assembly of the two is also qualified. The brake booster and master cylinder comprehensive testing device that the embodiment provided that this application is, compare in traditional testing arrangement, have the universality, can be used for detecting various types of booster, only need with the control unit connect the booster can.

In addition, the brake booster and master cylinder comprehensive test device provided by the embodiment of the application can be used for replacing the brake booster and the brake master cylinder in the tested device 70 alternately by reserving one of the qualified brake booster and brake master cylinder assemblies, so that the qualification of the single device for testing the brake booster and the brake master cylinder can be accurately detected, whether the brake booster and brake master cylinder assembly is qualified or not can be tested, various devices are not required to be used for measuring respectively, the test efficiency is high, and the cost is low.

In one embodiment, the brake booster and master cylinder integrated test apparatus further includes: and an oil pressure fluctuation simulation unit 80, wherein a liquid outlet of the oil pressure fluctuation simulation unit 80 is communicated with an output port of the oil path switching unit 20. A force sensor 12, the force sensor 12 being for detecting a feedback force of the pedal input unit 10.

The oil pressure fluctuation simulation unit 80 is configured to change the hydraulic pressure output from the brake circuit selected by the oil path switching unit 20 to the load simulation unit 30 in the master cylinder to simulate the oil pressure fluctuation when the brake booster-master cylinder assembly is in operation. The force sensor 12 is used to detect a feedback force of the pedal input unit 10 reflecting a feeling of the pedal 11 felt by the driver from the pedal input unit 10 when the brake circuit oil pressure fluctuates.

Specifically, in addition to the input/output characteristics of the brake booster-master cylinder assembly and the oil pressure at the output port of the oil path switching unit 20, whether the device 70 under test is qualified or not can be judged, and the oil pressure fluctuation simulation unit 80 can be set to communicate with the oil path output at the output port of the oil path switching unit 20 to simulate the oil pressure fluctuation of the brake circuit. When the control unit controls the oil pressure fluctuation simulation unit 80 to work, the feedback force of the pedal input unit 10 collected by the force sensor 12 is collected at the same time, and if the change of the feedback force at adjacent moments is judged not to exceed the feedback force threshold value, the situation that the force fluctuation of the pedal 11 felt by a driver from the pedal input unit 10 is not large when a brake circuit fluctuates can be ensured, and the brake booster and the brake master cylinder are qualified. For example, the feedback force threshold may be less than ± 5N, and it should be noted that the examples herein do not limit the practical protection scope of the present application, and the contrast force threshold may be set according to different specific models of the tested device 70, and the control unit may implement storing the contrast force threshold.

In one embodiment, the oil path switching unit 20 includes: the input ports of the electromagnetic directional valves 21 are respectively used for being communicated with the brake circuits of the tested device 70 in a one-to-one correspondence mode; the output port of the electromagnetic directional valve 21 is respectively communicated with the oil pressure fluctuation simulation unit 80 and the load simulation unit 30; the control end of the electromagnetic directional valve 21 is electrically connected with the control unit; the pressure sensor 50 is provided at an output port of the electromagnetic directional valve 21.

The electromagnetic directional valve 21 is a valve capable of selectively connecting an input end and an output end. The control unit sends a control command to the electromagnetic directional valve 21 to control the electromagnetic directional valve 21 to open one brake circuit at a time, brake hydraulic pressure is supplied to the load simulation unit 30 through an output port of the electromagnetic directional valve 21, and the oil pressure fluctuation simulation unit 80 acts on the oil pressure in the brake circuit where the electromagnetic directional valve 21 is opened through a pipeline to simulate the oil pressure fluctuation of the brake circuit, so as to measure whether the rotating speed of the load simulation unit 30 is lower than the brake speed required by product qualification and to measure whether the pedal 11 feeling felt by a driver from the pedal input unit 10 when the oil pressure of the brake circuit fluctuates meets the product qualification requirement. In one embodiment, each input port of the electromagnetic directional valve 21 is further connected with a corresponding switch valve, and the other end of the switch valve is used for connecting the same or different oil tanks, so that when the electromagnetic directional valve 21 selects one of the brake circuits to work, only the switch valve connected to the input port of the electromagnetic directional valve 21 is controlled to be closed, and the switch valves connected to the input ports of the electromagnetic directional valves 21 corresponding to the other brake circuits are controlled to be opened, so that the hydraulic oil in the unselected brake circuits flows back to the oil tanks from the switch valves arranged at the input ports of the electromagnetic directional valve 21. The brake master cylinder avoids overlarge pressure caused by hydraulic pressure generated by other brake circuits on the inner walls of the chambers of other brake circuits of the brake master cylinder, and further avoids the damage of the brake master cylinder caused by overhigh oil pressure. When the test is performed, the test may be performed according to the description in the above embodiment, and whether the device 70 under test is qualified or not may be detected by obtaining the rotation speed obtained by the rotation speed sensor 40, the oil pressure of the output port of the oil path switching unit 20 obtained by the pressure sensor 50, and the qualified parameter requirement of the device 70 under test.

In one embodiment, the master cylinder of the device under test 70 includes a first brake circuit Z1 and a second brake circuit Z2, the first input port of the electromagnetic directional valve 21 communicates with the first brake circuit Z1 of the master cylinder in the device under test 70, and the second input port of the electromagnetic directional valve 21 communicates with the second brake circuit Z2 of the master cylinder in the device under test 70;

the oil passage switching unit 20 further includes: a first tank 22; a first switching valve 23, one end of the first switching valve 23 being communicated with the first oil tank 22, the other end of the first switching valve 23 being communicated with the first brake circuit Z1; a second oil tank 24; a second switching valve 25, one end of the second switching valve 25 being communicated with the second oil tank 24, and the other end of the second switching valve 25 being communicated with the second brake circuit Z2; the pressure sensor 50 is provided at an output port of the electromagnetic directional valve 21.

For a two-cylinder master cylinder, the first input port of the electromagnetic directional valve 21 may be communicated with the first brake circuit Z1 of the master cylinder through a pipeline, and the second input port of the electromagnetic directional valve 21 may be communicated with the second brake circuit Z2 of the master cylinder through a pipeline. The control unit controls the operation of the brake booster after the pedal input unit 10 provides the driving force, and the hydraulic oil in the two brake circuits of the brake master cylinder flows to the two input ports of the electromagnetic directional valve 21 through the brake circuits under the pushing of the piston of the brake master cylinder. In order to detect whether the brake of each brake circuit of the brake master cylinder can be realized, when the first brake circuit Z1 is detected, the control unit controls: the first switch valve 23 is powered off, the second switch valve 25 is powered on and opened, the electromagnetic directional valve 21 is powered off and opens a passage between the first brake loop Z1 and the load simulation unit 30, the load simulation unit 30 provides load torque, collects the rotating speed collected by the rotating speed sensor 40 and the oil pressure at the output port of the oil path switching unit 20 collected by the pressure sensor 50, the oil pressure fluctuation test can be performed after the test is qualified according to the rotating speed and the oil pressure at the output port of the oil path switching unit 20, the oil pressure fluctuation simulation unit 80 is controlled to work, feedback force is continuously collected, and if the difference value of the feedback force at adjacent moments meets the parameter requirement of a qualified product, the first brake loop Z1 can work normally. When the second brake circuit Z2 is detected, the control unit controls: the first switch valve 23 is powered on, the second switch valve 25 is powered off, the electromagnetic directional valve 21 is powered on, the second motor 35 provides a load torque, the oil pressure fluctuation test is carried out after the test is qualified according to the rotating speed of the load simulation unit 30 and the oil pressure judgment test of the oil path switching unit 20, the control unit controls the oil pressure fluctuation simulation unit 80 to work and collects feedback force, and if the difference value of the feedback force at two adjacent moments after the oil pressure fluctuation simulation unit 80 works meets the parameter requirement of qualified products, the second brake loop Z2 can work normally.

In one embodiment, the oil pressure fluctuation simulation unit 80 includes:

the input end of the first motor 81 is electrically connected with the control unit;

a hydraulic pump 82, the hydraulic pump 82 being mechanically connected to an output shaft of the first motor 81;

a third oil tank 83, the third oil tank 83 being communicated with an output end of the hydraulic pump 82;

an inlet of the first check valve 84 is communicated with the hydraulic pump 82, an outlet of the first check valve 84 is communicated with an output port of the electromagnetic directional valve 21, and an outlet of the first check valve 84 is also communicated with a liquid inlet of the load simulation unit 30;

and one end of the proportional relief valve 85 is communicated with the outlet of the first check valve 84, and the other end of the proportional relief valve 85 is communicated with the third oil tank 83.

Specifically, a brake booster and a brake master cylinder, which are both tested pieces, are taken to form the tested device 70. According to the connection relationship, the brake booster and master cylinder comprehensive test device provided by the embodiment of the application is connected with the device to be tested 70. After the connection is completed, the comprehensive testing device is powered on to work, the pedal 11 in the pedal input unit 10 is stepped on at the moment, certain pedal displacement is applied, the test starts, when the first brake loop Z1 is detected, the first switch valve 23 is powered off, the second switch valve 25 is powered on, the electromagnetic directional valve 21 is powered off, the second motor 35 provides load torque, the oil pressure fluctuation test is carried out after the input and output characteristics and the tightness parameters of the tested device 70 are tested to be qualified, at the moment, the control unit controls the proportional overflow valve 85 to be powered on, the first motor 81 is controlled to work at the next moment, the reciprocating motion is carried out alternately, the oil pressure fluctuation of the brake loop is simulated, the feedback force collected by the force sensor 12 in the oil pressure fluctuation process is collected, and if the difference value of the feedback forces at two adjacent moments does not exceed the feedback force threshold value in the qualified parameters, the pedal 11 feeling felt by a driver when the oil pressure. Similarly, when the second brake circuit Z2 is detected, the first switch valve 23 is powered on, the second switch valve 25 is powered off, the electromagnetic directional valve 21 is powered on, the second motor 35 provides load torque, the oil pressure fluctuation test is performed after the input/output characteristics and the sealing performance are tested to be qualified, at this time, the control unit alternately controls the proportional relief valve 85 and the first motor 81 to be powered on and operated alternately, the proportional relief valve and the first motor reciprocate alternately to simulate the oil pressure fluctuation of the brake circuit, and the pedal 11 feeling of the driver from the pedal input unit 10 when the oil pressure fluctuation of the brake circuit is judged by collecting the feedback force collected by the force sensor 12.

In one embodiment, the oil pressure fluctuation simulation unit 80 further includes: and a second check valve 86, the second check valve 86 being disposed in a forward direction in a connecting passage between the proportional relief valve 85 and the third tank 83. The second check valve 86 is configured to restrict the hydraulic oil from flowing only in a direction in which the proportional relief valve 85 flows toward the third tank 83.

In one embodiment, the pedal input unit 10 includes: a pedal 11; an input rod 13, one end of the input rod 13 is mechanically connected with the pedal 11, and the other end of the input rod 13 is used for mechanically connecting a brake master cylinder in the tested device 70; the force sensor 12 is disposed inside the input rod 13.

After the tested device 70 is connected with the comprehensive testing device for the brake booster and the master cylinder provided by the embodiment of the application, the comprehensive testing device is electrified to work, the pedal 11 is stepped on, a certain pedal displacement is applied, the input rod 13 transmits the mechanical force of the pedal 11 to the master cylinder to drive the piston in the master cylinder to move, at the moment, the control unit controls the brake booster to work according to the pedal displacement of the pedal 11, and the brake fluid in the master cylinder is driven to be rapidly output to each input end of the oil path switching unit 20 through the brake circuit. The subsequent controller controls the working states of the oil path switching unit 20, the load simulation unit 30 and the oil pressure fluctuation simulation unit 80 as described in the above embodiment, so as to realize the test of the device 70 to be tested, and determine whether the device 70 to be tested is qualified according to the data collected from each sensor. If the assembly is qualified, one part is replaced to form a new brake booster-brake master cylinder assembly, next test is carried out, one qualified part is left each time, and one brake booster and one brake master cylinder are replaced alternately, so that the assembly, the brake booster and the brake master cylinder are detected, the efficiency is high, and the cost is low.

In one embodiment, the load simulation unit 30 includes: a brake caliper 31; a wheel 32; a caliper piston 33, wherein the caliper piston 33 is clamped on the caliper 31, the caliper piston 33 and the caliper 31 surround to form a hydraulic chamber 34, the hydraulic chamber 34 is used for storing hydraulic oil output by the electromagnetic directional valve 21, and the caliper 31 is arranged corresponding to the wheel 32 and is used for clamping the wheel 32 during braking; the second motor 35, the second motor 35 is electrically connected with the control unit; the rotation speed sensor 40 is used to measure the rotation speed of the wheel 32.

In order to provide load torque and simulate the braking action of a brake cylinder to a wheel 32 when the brake master cylinder outputs brake fluid, a load simulation unit 30 in the brake booster and master cylinder comprehensive test device provided by the embodiment of the application is provided with a brake caliper 31, a hole for a brake caliper piston 33 to pass through is formed in the brake caliper 31, the joint of the piston and the brake caliper 31 is sealed, when a pedal 11 is pressed down, each brake circuit of the brake master cylinder outputs brake fluid, the brake fluid in the brake circuit selected by an electromagnetic directional valve 21 enters a hydraulic cavity 34 along a pipeline, the brake caliper piston 33 moves towards the outside of the brake caliper 31 under the pressure action of the brake fluid, and the brake caliper pistons 33 are respectively arranged on two sides of the wheel 32 and clamp the wheel 32 so that the wheel 32 does not rotate. The control unit controls the second motor 35 to provide a certain load torque, for example, the control unit may control the second motor 35 to provide the load torque T according to the following formula:

wherein k is a constant; x is pedal displacement; i.e. i₁Is the pedal 11 lever ratio; i.e. i₂The boosting ratio of the brake booster is; mu.s₁The mechanical efficiency of the pedal 11; d₁Is the cylinder diameter of a brake master cylinder; p is a radical of₀The opening pressure of a brake piston in a brake master cylinder; c₁Is a braking efficiency factor; d₂For the cylinder diameter of calipers, i.e. brakingThe diameter of the hydraulic chamber formed by the caliper and the brake piston; mu.s₂Comprehensively testing the mechanical efficiency of the device for the brake booster and the master cylinder, wherein the mechanical efficiency is related to the mechanical efficiency of the device to be tested and the mechanical efficiency of the brake caliper; r is₁The distance between the projection point of the center of the cross section of the piston on the wheel and the center of the wheel.

When the brake booster works under a certain pedal displacement x, the brake master cylinder can output a certain oil pressure, then the oil pressure and the selected brake circuit act on the brake caliper piston 33, and the brake piston clamps the wheel 32 to form a brake torque; when the braking torque provided by the caliper piston 33 is balanced with the load torque provided by the second electric motor 35, it means that the input-output characteristics of the device under test 70 are consistent with the target, i.e., acceptable, and at this time, the actual rotation speed of the wheel 32 should tend to 0 because of the torque balance.

In one embodiment, as shown in fig. 2 and 3, the control unit includes:

the output end of the oil path switching unit controller 61 is respectively and electrically connected with the electromagnetic directional valve 21, the first switch valve 23 and the second switch valve 25;

the output end of the oil pressure fluctuation unit controller 62 is respectively and electrically connected with the first motor 81 and the proportional overflow valve 85;

the load motor controller 63, the output end of the load motor controller 63 is electrically connected with the second motor 35;

and the output end of the master controller is respectively and electrically connected with the input end of the oil path switching unit controller 61, the input end of the oil pressure fluctuation unit controller 62 and the input end of the oil pressure fluctuation unit controller 62, and the master controller is also in communication connection with the pressure sensor 50, the rotating speed sensor 40 and the force sensor 12.

In order to comprehensively coordinate the work of the device under test 70, the oil path switching unit 20, the oil pressure fluctuation simulation unit 80 and the load simulation unit 30, the control unit in the brake booster and master cylinder comprehensive testing device provided by the embodiment of the application comprises a master controller, an oil path switching unit controller 61, an oil pressure fluctuation unit controller 62 and a load motor controller 63, the master controller controls the work of each unit controller, the master controller acquires data detected by the rotation speed sensor 40, the pressure sensor 50 and the force sensor 12, and whether the device under test 70 is qualified is judged according to the acquired data. The composition of each unit controller can be various composition forms which can be thought by those skilled in the art to realize the above unit operation control, and all the compositions are the scheme to be protected by the present application.

In one embodiment, as shown in fig. 3, the oil pressure fluctuation unit controller 62 may include: after the input/output characteristics and the tightness parameters of the tested device 70 are detected to be qualified, the master controller controls the timing controller 621 to work according to the power-on sequence required by the test, the pulse generating circuit 622 and the pressure stabilizing chip 623 are alternately powered, the pressure stabilizing chip 623 is powered at the time n, the pressure stabilizing chip 623 outputs the rated working voltage of the proportional overflow valve 85, the proportional overflow valve 85 works, and at the time n +1, the timing controller 621 powers the pulse generating circuit 622, the pulse generating circuit 622 outputs pulse signals to drive the first motor 81 to rotate, the first motor 81 drives the hydraulic pump 82 to work, then the oil pressure of the output port of the electromagnetic directional valve 21 at each time is measured to judge whether the oil pressure difference at the adjacent time is lower than the oil pressure difference threshold value, and if the oil pressure difference is lower, the oil pressure fluctuation parameters are qualified.

In one embodiment, the load motor controller 63 may be a pulse generating circuit for outputting a pulse signal to drive the second motor 35 to provide the load torque when receiving a control command from the overall controller.

In one embodiment, the oil pressure switching unit controller may be a multi-channel timing controller, and the on-off state control of each switching valve and the electromagnetic directional valve 21 is realized by using the power-on sequence control function of the timing controller, so that the oil path switching unit 20 selectively switches on one braking circuit.

In one embodiment, the control unit further comprises: and the input end of the analog-to-digital conversion module is respectively and electrically connected with the force sensor 12, the pressure sensor 50 and the rotating speed sensor 40, and the output end of the analog-to-digital conversion module is connected with the master controller. The analog-to-digital conversion module is used for converting analog quantity acquired by each sensor into digital quantity and transmitting the digital quantity to a master controller such as an industrial personal computer, so that the master controller can process and calculate each data and judge whether the tested device 70 is qualified.

On the other hand, the embodiment of the present application further provides a brake booster and master cylinder comprehensive test control method, as shown in fig. 4, including:

s20: when the pedal displacement of the pedal input unit is not 0, controlling a brake booster in a tested device to work, wherein the tested device comprises the brake booster and a brake master cylinder which are connected in a matching manner; the pedal input unit is used for converting the treading force into the driving force of the tested device and enabling the tested device to provide brake hydraulic pressure;

s40: the output port of the control oil path switching unit is communicated with one path of brake circuit of a brake main cylinder in the tested device; wherein, each input end of the oil path switching unit is respectively used for correspondingly communicating with each brake circuit outlet of a brake main cylinder in the tested device;

s60: controlling the load simulation unit to provide load torque;

s80: acquiring the rotating speed of a load simulation unit acquired by a rotating speed sensor;

s90: acquiring oil pressure of an output port of the oil path switching unit, which is acquired by a pressure sensor, wherein the pressure sensor is arranged at the output port of the oil path switching unit;

s91: and judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil way switching unit.

The definitions of the pedal input unit and the like are the same as the definitions and functions of the comprehensive testing device, and are not described herein. Before the test is started, a new brake booster and a brake master cylinder are arranged to form a tested device; after the comprehensive testing device is electrified, the pedal is stepped down, certain pedal displacement is applied, and the test is started. Controlling the brake booster in the tested device to work according to the pedal displacement, enabling the brake master cylinder to output brake fluid and generate hydraulic pressure in the brake loop, controlling the oil path switching unit to selectively connect one brake loop when detecting a certain brake loop, controlling the load simulation unit to provide load torque, acquiring data collected by the pressure sensor and the rotating speed sensor, judging the input and output characteristics and the sealing performance of the tested device according to the collected rotating speed and the oil pressure of the output port of the oil path switching unit, and testing to be qualified if the input and output characteristics and the sealing performance meet the parameter requirements of qualified products.

In one embodiment, the brake booster and master cylinder integrated test control method further includes:

s92: the output port of the control oil path switching unit is communicated with the next brake circuit of the brake main cylinder in the tested device;

and skipping to execute the step of acquiring the rotating speed of the load simulation unit acquired by the rotating speed sensor.

The testing of each brake circuit is realized by controlling the oil path switching control unit, and the testing realization process can refer to the description in the embodiment of the comprehensive testing device and the description in the embodiment of the method.

As shown in fig. 5, if all the brake circuits are tested to be qualified, the brake booster which is tested to be qualified can be taken down and assembled, then the brake master cylinder which is tested to be qualified is left, a new brake booster is placed to be tested, the left brake master cylinder and the new brake booster are assembled to be a new assembly, and the steps of the test control method are repeated, so that the detection of the new brake booster and the test of the new brake booster-brake master cylinder assembly are realized, and whether the brake booster is qualified or not can be tested, and whether the brake booster is qualified or not after the assembly can be tested. After the new test is qualified, taking down the qualified brake master cylinder, and assembling the qualified brake master cylinder with the first brake booster, wherein the formed brake booster-brake master cylinder assembly component is necessarily a qualified product, at the moment, the qualified brake booster based on the second test is matched with the new brake master cylinder to be tested for testing, the brake master cylinder is a tested piece, the brake master cylinder is tested, if the test is qualified, the qualified brake booster in the second test is taken down, the assembly is carried out, then the qualified brake master cylinder in the fourth test is left, and the new brake booster to be tested is placed; … … the performance test of the brake booster, the brake master cylinder and the assembly thereof can be completed by analogy.

acquiring the rotating speed of a wheel acquired by a rotating speed sensor;

the step of judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil way switching unit comprises the following steps of:

The pedal is stepped down, the brake booster is controlled to work according to pedal displacement, hydraulic pressure in the brake master cylinder is increased, brake fluid flows to an input port of the oil path switching unit, the second motor is controlled to work, the second motor provides load torque for a wheel, the oil path switching unit is controlled to select to connect one path of brake circuit, the brake fluid flows into the hydraulic cavity along the brake circuit to form thrust on a brake caliper piston in the hydraulic cavity, the brake caliper piston clamps the wheel, if the clamping force of the brake caliper piston can be equal to the load torque, the wheel cannot rotate at the moment or the rotating speed of the wheel tends to 0, and therefore, whether the actual rotating speed n of the second motor is smaller than the rotating speed threshold of the second motor (the rotating speed threshold of the second motor can be smaller than 5r/min) or not can be judgedWhether the input and output characteristics are qualified or not. The leak tightness of the device under test can be judged from the oil pressure at the output port of the oil passage switching unit detected by the pressure sensor, the brake circuit is not leaked with good leak tightness, the brake circuit oil pressure can be stabilized after rising, the brake circuit pressure cannot be maintained once oil leaks, and the pressure continues to decrease, so the leak tightness can be judged from the oil pressure difference between the front and rear time points, and if P is the case_n+1-P_n≤P₀And then, the sealing performance of the brake circuit is good, wherein the oil pressure difference threshold can be less than 0.1 MPa.

and controlling the oil pressure fluctuation simulation unit to output the changed oil pressure to the output port of the oil path switching unit.

After the input-output characteristics and the sealing performance of the tested device are qualified, the hydraulic fluctuation simulation unit is controlled to work, the fluctuating oil pressure is provided for the brake loop selected by the oil pressure switching unit, the oil pressure fluctuation of the brake loop is simulated, the feedback force collected by the force sensor is obtained at the moment, and the pedal feeling felt by a driver when the oil pressure of the brake loop fluctuates is evaluated according to the feedback force. And comprehensively judging whether the tested device is qualified or not by combining the input and output characteristics and the sealing performance detection result.

The vibration feeling of the pedal when the oil pressure of the brake loop fluctuates is also an important parameter for measuring whether the brake is qualified, the smaller the feedback force difference value of the pedal when the oil pressure fluctuates is, the smaller the vibration feeling of the pedal is, the feedback force difference threshold value can be set according to the performance requirements of different brakes, and if F is, the feedback force difference threshold value is set_n+1-F_n≤F₀And if so, indicating that the shaking condition of the pedal meets the parameter requirement of qualified products when the oil pressure of the brake circuit fluctuates, wherein the threshold value of the feedback force difference can be less than +/-5N.

if yes, judging that the tested device is qualified;

the oil pressure rise time is a first time threshold value, the oil return time is an oil return time, and the second time threshold value is used.

The oil pressure rise time is a time required for the master cylinder to output a stable oil pressure when the oil pressure value before the pedal is depressed rises to the pedal displacement x during braking, that is, a time required for the initial oil pressure before the pedal is depressed to rise to the maximum oil pressure. The oil return time can refer to the time required by the oil pressure to be reduced from the maximum value to the corresponding oil pressure before the pedal is stepped, after the external force applied to the pedal of the pedal input unit disappears, the time for the oil pressure to be reduced from the maximum value to the minimum value is obtained by obtaining the oil pressure of the output port of the oil path switching unit, and the speed of oil return of the tested device, namely the speed of pedal resetting is evaluated.

and acquiring the time for the oil pressure at the output port of the oil path switching unit to rise to the maximum value according to the oil pressure at the output port of the oil path switching unit.

The maximum value is the maximum value when the oil pressure at the output end of the oil path switching unit starts when the pedal in the pedal input unit is not pressed down, the hydraulic pressure of the brake master cylinder rises when the pedal is pressed down, the oil pressure at the output end of the oil path switching unit communicated with the brake circuit also gradually rises, and the maximum value reached in the rising process is the maximum value. The time when the oil pressure rises to the maximum value can reflect the forming efficiency of the brake hydraulic pressure of the tested device and can also reflect whether the performance of the tested device reaches the standard or not.

It should be noted that, the brake booster and master cylinder comprehensive test control method provided by the embodiment of the present application can also execute other steps executed by the control unit in the brake booster and master cylinder comprehensive test device,

a brake booster and master cylinder integrated test control method, as shown in fig. 6, comprising:

s300: controlling the load simulation unit to work;

s310: when the pedal displacement of the pedal input unit is not 0, controlling a brake booster in a tested device to work, wherein the tested device comprises the brake booster and a brake master cylinder which are connected in a matching manner; the pedal input unit is used for converting the treading force into the driving force of the tested device and enabling the tested device to provide brake hydraulic pressure;

s320: the output port of the control oil path switching unit is communicated with one path of brake circuit of a brake main cylinder in the tested device; wherein, each input end of the oil path switching unit is respectively used for correspondingly communicating with each brake circuit outlet of a brake main cylinder in the tested device;

s330: acquiring the rotating speed of a load simulation unit acquired by a rotating speed sensor;

s340: acquiring oil pressure of an output port of the oil path switching unit, which is acquired by a pressure sensor, wherein the pressure sensor is arranged at the output port of the oil path switching unit;

s350: and judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil way switching unit.

Firstly, controlling the load simulation unit to work, for example, controlling the second motor to rotate to drive the wheel to rotate, when the pedal is stepped on and the pedal displacement is not 0, the pedal generates mechanical thrust through the input rod to push the piston in the brake master cylinder to move, and simultaneously, controlling the brake booster to work according to the pedal displacement to provide brake fluid for the brake master cylinder, the hydraulic pressure in the master cylinder is increased, the brake fluid is output to the hydraulic cavity of the load simulation unit, the brake fluid pushes the brake caliper piston to move through the hydraulic pressure formed in the hydraulic cavity to clamp the wheel, the wheel is decelerated, the braking time of the tested device can be obtained by obtaining the rotating speed of the second motor collected by the rotating speed sensor, whether the tested device is qualified or not can be judged according to the length of the braking time, in addition, as described in the above embodiment, the sealing performance of the braking circuit can also be judged according to the oil pressure, the device to be tested is detected.

In one embodiment, the step of controlling the operation of the load simulating unit comprises:

controlling a second motor to work, wherein the second motor is used for driving the wheels to rotate;

acquiring the rotating speed of a wheel acquired by a rotating speed sensor;

According to the oil pressure change condition of the output port of the oil path switching unit collected by the pressure sensor, the oil pressure rising time and the oil return time can be obtained, wherein the definitions of the oil pressure rising time and the oil return time are the same as those in the embodiment.

A testing method of the brake booster and master cylinder comprehensive testing device, as shown in fig. 5, includes:

providing a driving force to the master cylinder through the pedal input unit;

operating the control unit to work and testing the tested device;

after the test is qualified every time, alternately replacing the first part and the second part in the tested device to form a new tested device, and testing the new tested device;

After the units and the tested device are connected, and the control unit enters a working state, the process of testing the tested device can be carried out according to the description scheme in the embodiment of the brake booster and master cylinder comprehensive test device and the brake booster and master cylinder comprehensive test control method, so that the qualification of the brake booster, the qualification of the brake master cylinder and the qualification of the brake booster-brake master cylinder assembly after detection are ensured. The application provides a test method which comprises the following steps: firstly, placing a new brake booster and a new brake master cylinder which are tested pieces to form a tested device; the pedal is stepped down, a certain displacement value is applied, a first test is carried out, the control unit realizes a test according to the steps in the control method, if all brake circuits are detected to be qualified, the brake booster which is tested to be qualified in the first test is taken down to be assembled, then the brake master cylinder which is tested to be qualified in the first test is left, a new brake booster is placed as a tested device, the second test is carried out on the formed new tested device, if the second test is qualified, the brake master cylinder which is tested to be qualified in the first test is taken down to be assembled with the brake booster used in the first test, and a qualified brake booster-brake master cylinder assembly component is formed. At the moment, the brake booster qualified in the second test is left; and placing a new brake master cylinder to be tested as a tested piece based on the brake booster qualified in the second test, and carrying out the third test. If the test is qualified, taking down the brake booster qualified in the second test, waiting for assembly, then leaving the brake master cylinder qualified in the third test, placing a new brake booster to be tested as a tested object, and carrying out a fourth test; if the test is qualified, taking down the brake master cylinder qualified in the third test, and assembling the brake master cylinder with the qualified brake booster left in the second test to form another qualified brake booster-brake master cylinder assembly part, wherein the qualified brake booster of the fourth test is left at the moment; and by analogy, after the test is qualified every time, one tested piece is replaced alternately, a new test is carried out, and after the test is qualified, the tested piece reserved in the previous test and the replaced tested piece in the previous test are assembled into a qualified assembly, so that the performance tests of the brake booster, the brake master cylinder and the assembly of the brake booster and the brake master cylinder can be completed.

It should be understood that, although the steps in the flowcharts of fig. 4 or 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 4 or 6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the sub-steps or stages of other steps.

A brake booster and master cylinder integrated test control apparatus, as shown in fig. 7, comprising:

the device comprises a tested device driving module 1, a brake master cylinder and a brake control module, wherein the tested device driving module is used for controlling a brake booster in a tested device to work when the pedal displacement of a pedal input unit is not 0, and the tested device comprises the brake booster and the brake master cylinder which are connected in a matching manner; the pedal input unit is used for converting the treading force into the driving force of the tested device and enabling the tested device to provide brake hydraulic pressure;

the switching control module 2 is used for controlling the communication between the output port of the oil path switching unit and one path of brake circuit of a brake master cylinder in the tested device; wherein, each input end of the oil path switching unit is respectively used for correspondingly communicating with each brake circuit outlet of a brake main cylinder in the tested device;

the load control module 3 is used for controlling the load simulation unit to provide load torque;

the rotating speed acquisition module 4 is used for acquiring the rotating speed of the load simulation unit acquired by the rotating speed sensor;

the oil pressure acquisition module 5 is used for acquiring the oil pressure of the output port of the oil path switching unit, which is acquired by the pressure sensor, and the pressure sensor is arranged at the output port of the oil path switching unit;

and the qualification judgment module 6 is used for judging whether the tested device is qualified or not according to the rotating speed and the oil pressure of the output port of the oil path switching unit.

For specific limitations of the brake booster and the master cylinder comprehensive test control device, reference may be made to the above limitations of the brake booster and the master cylinder comprehensive test control method, and details thereof are not repeated here. The above-mentioned respective modules in the brake booster and master cylinder integrated test control apparatus may be wholly or partially implemented by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. The brake booster and master cylinder comprehensive test control device provided by the embodiment of the application further comprises a unit module capable of executing other steps in the method embodiment.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a brake booster and master cylinder integrated test control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:

s60: controlling the load simulation unit to provide load torque;

The computer device may perform any of the steps of the above method embodiments to implement the functions that can be implemented by the steps of the method.

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

s60: controlling the load simulation unit to provide load torque;

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus DRAM (RDRAM), and interface DRAM (DRDRAM).

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A brake booster and master cylinder integrated test device, characterized by includes:

a pedal input unit for converting a tread force into a driving force of a device under test to cause the device under test to supply a brake hydraulic pressure; the device to be tested comprises a brake booster and a brake master cylinder;

the input ends of the oil path switching unit are respectively used for being correspondingly communicated with the outlets of the brake circuits of the brake master cylinder in the tested device;

the pressure sensor is arranged at an output port of the oil path switching unit and is used for detecting the oil pressure of the output port of the oil path switching unit;

2. The brake booster and master cylinder combination test device according to claim 1, further comprising:

the liquid outlet of the oil pressure fluctuation simulation unit is communicated with the output port of the oil path switching unit;

a force sensor for detecting a feedback force of the pedal input unit.

3. The brake booster and master cylinder comprehensive test device according to claim 2, wherein the oil path switching unit includes:

the input ports of the electromagnetic directional valves are respectively used for being communicated with the brake circuits of the tested device in a one-to-one correspondence manner; the output port of the electromagnetic directional valve is respectively communicated with the oil pressure fluctuation simulation unit and the load simulation unit; the control end of the electromagnetic directional valve is electrically connected with the control unit;

4. The integrated brake booster and master cylinder testing device as recited in claim 3, wherein the master cylinder of the device under test comprises a first brake circuit and a second brake circuit, the first input port of the electromagnetic directional valve is communicated with the first brake circuit of the master cylinder in the device under test, and the second input port of the electromagnetic directional valve is communicated with the second brake circuit of the master cylinder in the device under test;

the oil path switching unit further includes:

a first oil tank;

a second oil tank;

and one end of the second switch valve is communicated with the second oil tank, and the other end of the second switch valve is communicated with the second brake circuit.

5. The brake booster and master cylinder integrated test device according to claim 4, wherein the oil pressure fluctuation simulation unit includes:

a hydraulic pump mechanically connected to an output shaft of the first motor;

the third oil tank is communicated with the output end of the hydraulic pump;

the inlet of the first one-way valve is communicated with the hydraulic pump, the outlet of the first one-way valve is communicated with the output port of the electromagnetic directional valve, and the outlet of the first one-way valve is also communicated with the liquid inlet of the load simulation unit;

one end of the proportional overflow valve is communicated with the outlet of the first check valve, the other end of the proportional overflow valve is communicated with the third oil tank, and the control end of the proportional overflow valve is electrically connected with the control unit.

6. The brake booster and master cylinder integrated test device according to claim 5, wherein the pedal input unit includes:

a pedal;

the input rod is mechanically connected with the pedal at one end, and the other end of the input rod is used for being mechanically connected with a brake master cylinder in the tested device;

the force sensor is disposed inside the input lever.

7. The brake booster and master cylinder integrated test device according to claim 6, wherein the load simulation unit includes:

a brake caliper;

a wheel;

the second motor is electrically connected with the control unit;

8. The brake booster and master cylinder integrated test device according to claim 7, wherein the control unit includes:

9. A brake booster and master cylinder comprehensive test control method is characterized by comprising the following steps:

when the pedal displacement of the pedal input unit is not 0, controlling a brake booster in a tested device to work, wherein the tested device comprises the brake booster and a brake master cylinder which are connected in a matching manner; the pedal input unit is used for converting a treading force into a driving force of a tested device and enabling the tested device to provide brake hydraulic pressure;

controlling the load simulation unit to provide load torque;

acquiring the rotating speed of the load simulation unit acquired by a rotating speed sensor;

10. A brake booster and master cylinder integrated test control method according to claim 9, wherein the step of controlling the load simulation unit to provide the load torque includes:

controlling a second motor to work, wherein the second motor is used for driving wheels to rotate so as to provide load torque;

acquiring the rotating speed of the wheel acquired by the rotating speed sensor;

if n is less than or equal to n₀And P is_n+1-P_n≤P₀Judging that the tested device is qualified;

where n is the second motor speed, n₀Is a second motor speed threshold, P_n+1The oil pressure at the output port of the oil path switching unit at the moment of n +1, P_nOil pressure at output port of oil passage switching unit at n-th time, P₀Is the oil pressure difference threshold;

the load simulation unit comprises the wheel, the second motor, a brake caliper and a brake caliper piston, the brake caliper and the brake caliper piston surround to form a hydraulic cavity, the hydraulic cavity is used for storing hydraulic oil at an output port of the oil path switching unit, the brake caliper piston is clamped on the brake caliper, and the brake caliper piston, the brake caliper and the brake caliper are arranged corresponding to the wheel and used for clamping the wheel during braking.

11. The brake booster and master cylinder integrated test control method according to claim 10, wherein the step of acquiring the oil pressure of the oil passage switching unit output port collected by the pressure sensor further includes, after the step of acquiring the oil pressure of the oil passage switching unit output port:

12. The brake booster and master cylinder integrated test control method according to claim 11, wherein the step of determining whether the device under test is qualified or not based on the rotation speed, the oil pressure at the output port of the oil passage switching unit, and the feedback force includes:

if n is less than or equal to n₀And P is_n+1-P_n≤P₀And F is_n+1-F_n≤F₀Judging that the tested device is qualified;

wherein, F_n+1Feedback force, F, acquired by the sensor at time n +1_nFor the feedback force acquired by the force sensor at time n, F₀Is a feedback force difference threshold.

13. The brake booster and master cylinder integrated test control method according to claim 12, wherein the step of determining whether the device under test is acceptable based on the rotation speed and the oil pressure at the output port of the oil passage switching unit includes:

wherein, T₁For the oil pressure rise time, T₀Is a first time threshold, T₂For oil return time, T₀' is a second time threshold.

14. A brake booster and master cylinder comprehensive test control method is characterized by comprising the following steps:

controlling the load simulation unit to work;

15. A method for testing a brake booster and master cylinder combination test apparatus according to any one of claims 1 to 8, comprising:

connecting the pedal input unit with a brake master cylinder in the tested device;

correspondingly communicating each input end of the oil path switching unit with each brake circuit outlet of a brake master cylinder in the tested device;

communicating a liquid inlet of the load simulation unit with an output port of the oil circuit switching unit;

a control unit is respectively and electrically connected with a brake booster in the tested device, a control end of the oil path switching unit, a control end of the load simulation unit, a rotating speed sensor and a pressure sensor; the pressure sensor is arranged at an output port of the oil path switching unit and is used for detecting the oil pressure of the output port of the oil path switching unit; the rotating speed sensor is used for acquiring the rotating speed of the load simulation unit;

providing a driving force to the master cylinder through a pedal input unit;

operating the control unit to carry out a working state, and testing the tested device;

wherein the first component is the brake master cylinder and the second component is the brake booster; or the first component is the brake booster and the second component is the master cylinder.