A brake leak simulation device and method

Abstract

The application discloses a kind of brake leakage simulation device and method.The device includes brake leakage simulation controller, integrated brake control system, liquid storage tank, actuator, negative pressure accumulator, first two-position three-way valve, flow collector, target brake caliper, and with the target brake caliper matched second two-position three-way valve, two-way valve, check valve and flow control valve, the technical scheme of the application can accurately control the flow of brake fluid leakage, improve the accuracy of brake fluid leakage simulation, improve the scene coverage of brake circuit leakage condition, save time and labor cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake control, in particular to a brake leakage simulation device and method. BACKGROUND

[0002] With the development of brake electronic control system, IBC (integrated brake control system) has been applied more and more. When the brake fluid of the vehicle brake circuit leaks, IBC can ensure the safety of vehicle braking and the normality of other functions. Therefore, it is necessary to simulate the leakage condition of the brake circuit to verify whether the IBC control function can meet the expectation under different leakage amounts.

[0003] At present, the leakage simulation of the brake circuit needs to manually open the air release bolt of the brake caliper, but this manual method cannot accurately control the flow of brake fluid leakage, and after the leakage condition simulation of the brake circuit is completed, the air must be released again to test the normal function of the brake system, which is high in time cost and labor cost. SUMMARY

[0004] The present application provides a brake leakage simulation device and method to accurately control the flow of brake fluid leakage, improve the accuracy of brake fluid leakage simulation, improve the scene coverage of the leakage condition of the brake circuit, and save time and labor cost.

[0005] In a first aspect, the present application provides a brake leakage simulation device, which comprises a brake leakage simulation controller, an integrated brake control system, a liquid storage tank, an actuator cylinder, a negative pressure accumulator, a first two-position three-way valve, a flow collector, a target brake caliper, a second two-position three-way valve matched with the target brake caliper, a two-position two-way valve, a check valve and a flow control valve.

[0006] The first port of the second two-position three-way valve is connected with the integrated brake control system, the second port of the second two-position three-way valve is connected with the first port of the two-position two-way valve and the first port of the check valve, and the third port of the second two-position three-way valve is connected with the target brake caliper.

[0007] The first port of the flow control valve is connected with the second port of the two-position two-way valve and the second port of the check valve, and the second port of the flow control valve is connected with the flow collector.

[0008] The first port of the first two-position three-way valve is connected with the liquid storage tank, the second port of the first two-position three-way valve is connected with the flow collector, and the third port of the first two-position three-way valve is connected with the negative pressure accumulator.

[0009] The negative pressure accumulator is higher than the liquid storage tank in a vertical direction.

[0010] The brake leakage simulation controller is configured to simulate brake fluid leakage of the target brake caliper by controlling the first two-position three-way valve, the second two-position three-way valve, the two-position two-way valve, the one-way valve, the flow control valve, and the negative pressure accumulator.

[0011] In a second aspect, the embodiments of the present application further provide a brake leakage simulation method, which comprises:

[0012] If it is determined that the actuator cylinder stroke and the integrated brake control system push rod stroke are both in the extension stroke, the one-way conduction of the leakage circuit is controlled to allow the brake fluid to flow into the leakage circuit in one direction, and the parameters of the integrated brake control system are collected to analyze the brake fluid leakage according to the parameters of the integrated brake control system at different times and different integrated brake control system push rod strokes.

[0013] If it is determined that the actuator cylinder stroke and the integrated brake control system push rod stroke are both in the return stroke, the brake fluid in the leakage circuit is pumped out.

[0014] If it is determined that the brake fluid leakage simulation is completed, the brake circuit is controlled to be conducted, and the leakage circuit is closed.

[0015] The technical scheme of the embodiments of the present application, by the target brake caliper and the second two-position three-way valve matched with the target brake caliper, constitutes a brake circuit, and by the second two-position three-way valve matched with the target brake caliper, the two-position two-way valve, the one-way valve, and the flow control valve, constitutes a leakage circuit, so that when the actuator cylinder and the IBC push rod stroke are both in the extension stroke, the brake fluid enters the leakage circuit to simulate the scene of brake fluid leakage, when the actuator cylinder and the IBC push rod stroke are both in the return stroke, the leakage circuit is opened to allow air to enter the second two-position three-way valve, and then when the actuator cylinder and the IBC push rod stroke are both in the extension stroke, the brake circuit is opened to simulate the scene of air leakage of the brake circuit, by setting the negative pressure accumulator higher than the IBC liquid storage tank, when the brake fluid in the liquid storage tank is insufficient, the brake fluid in the negative pressure accumulator can flow into the liquid storage tank automatically, and the brake fluid in the liquid storage tank can be pumped out through the negative pressure accumulator to simulate the scene of insufficient brake fluid. The technical scheme of the present application can accurately control the flow of brake fluid leakage, improve the accuracy of brake fluid leakage simulation, improve the scene coverage of the leakage working condition of the brake circuit, and save time and labor cost.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0018] Figure 1 is a structural schematic diagram of a brake leakage simulation device provided by the first embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of another brake leakage simulation device provided by the first embodiment of the present application;

[0020] Figure 3 is a flow chart of a brake leakage simulation method provided by the fourth embodiment of the present application;

[0021] Figure 4 is a flow chart of another brake leakage simulation method provided by the fourth embodiment of the present application;

[0022] Figure 5 is a flow chart of another brake leakage simulation method provided by the fourth embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the person skilled in the art better understand the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should be within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment one

[0026] Figure 1A structural schematic diagram of a brake leakage simulation device is provided for the first embodiment of the present application. The first embodiment can be applied to the case of brake leakage simulation test on IBC. The brake leakage simulation device can be realized in the form of hardware and / or software. The brake leakage simulation device can be configured in a brake leakage simulation controller.

[0027] As shown in Figure 1 , the device includes a brake leakage simulation controller 10, an integrated brake control system 20, a liquid storage tank 30, an actuator cylinder 40, a negative pressure accumulator 50, a first two-position three-way valve 60, a flow collector 70, a target brake caliper 80, and a second two-position three-way valve 81, a two-position two-way valve 82, a check valve 83, and a flow control valve 84 matched with the target brake caliper 80.

[0028] The first port of the second two-position three-way valve 81 is connected with the integrated brake control system 20. The second port of the second two-position three-way valve 81 is connected with the first port of the two-position two-way valve 82 and the first port of the check valve 83. The third port of the second two-position three-way valve 81 is connected with the target brake caliper 80.

[0029] The first port of the flow control valve 84 is connected with the second port of the two-position two-way valve 82 and the second port of the check valve 83. The second port of the flow control valve 84 is connected with the flow collector 70.

[0030] The first port of the first two-position three-way valve 60 is connected with the liquid storage tank 30. The second port of the first two-position three-way valve 60 is connected with the flow collector 70. The third port of the first two-position three-way valve 60 is connected with the negative pressure accumulator 50.

[0031] The negative pressure accumulator 50 is higher than the liquid storage tank 30 in the vertical direction.

[0032] The brake leakage simulation controller 10 is configured to simulate brake fluid leakage of the target brake caliper 80 by controlling the first two-position three-way valve 60, the second two-position three-way valve 81, the two-position two-way valve 82, the check valve 83, the flow control valve 84, and the negative pressure accumulator 50.

[0033] In the IBC, that is, the integrated brake control system 20 normally operates, the flow direction of the brake fluid is along the brake circuit of the IBC, the second two-way three-way valve 80 and the target brake caliper, from the IBC to the target brake caliper, or in the opposite direction. The technical scheme of the embodiment is to simulate the scenario of brake fluid leakage. On the basis of the brake circuit, by setting the two-way two-way valve 82, the one-way valve 83 and the flow control valve 84, the leakage circuit is constructed, and by introducing the brake fluid into the leakage circuit, the scenario of brake fluid leakage is simulated. At the same time, the flow control valve 84 is arranged in the leakage circuit, and by controlling the opening of the flow control valve 84, the flow of the brake fluid can be accurately controlled, and the accuracy of the brake fluid leakage simulation is improved. At the same time, since the two-way two-way valve 82 in the leakage circuit is turned on, air can be introduced into the second two-way three-way valve 80, thereby simulating the scenario of air leakage in the brake circuit. At the same time, the negative pressure accumulator 50 is arranged higher than the liquid storage tank 30 in the vertical direction, so that when the brake fluid in the liquid storage tank 30 is insufficient, the brake fluid in the negative pressure accumulator 50 can flow back to the liquid storage tank 30, thereby solving the problem of insufficient brake fluid in the liquid storage tank 30. And the negative pressure accumulator 50, the first two-way three-way valve 60 and the liquid storage tank 30 constitute a negative pressure circuit, and when the negative pressure accumulator 50 is opened, the brake fluid in the liquid storage tank 30 is sucked into the negative pressure accumulator 50 along the negative pressure circuit, which can simulate the scenario of insufficient brake fluid. Therefore, the technical scheme of the embodiment can simulate multiple leakage working conditions, and improve the scenario coverage of the brake circuit leakage working condition.

[0034] It should be noted that the number of target brake calipers 80 can be one or more, for example, the target brake calipers can be left front brake calipers, left rear brake calipers, right front brake calipers and right rear brake calipers, and the type and number of target brake calipers are not limited in the embodiment, and can be flexibly set according to the actual needs of simulation experiments, which can realize single-wheel brake caliper brake pipe leakage or multi-wheel brake caliper combined brake pipe leakage working condition simulation.

[0035] Figure 2 Another structure diagram of a brake leakage simulation device is provided, Figure 2 The left front brake caliper, the left rear brake caliper, the right front brake caliper and the right rear brake caliper are taken as examples for brake fluid leakage simulation. Among them, the second two-way three-way valves corresponding to the left front brake caliper, the left rear brake caliper, the right front brake caliper and the right rear brake caliper are two-way three-way valve 1, two-way three-way valve 2, two-way three-way valve 3 and two-way three-way valve 4 respectively, and the first two-way three-way valve is two-way three-way valve 5. Between each brake caliper and the two-way three-way valve corresponding thereto, a pressure sensor is also connected, which is used to collect the pressure value of the brake circuit.

[0036] On the basis of the above-mentioned embodiment, the brake leakage simulation device further comprises a displacement sensor configured to collect the actuating cylinder stroke and send the actuating cylinder stroke to the brake leakage simulation controller.

[0037] The integrated brake control system is configured to collect the integrated brake control system push rod stroke and send the integrated brake control system push rod stroke to the brake leakage simulation controller.

[0038] The displacement sensor can be connected to the actuating cylinder and configured to collect the actuating cylinder stroke. The IBC can send the IBC push rod stroke to the brake leakage simulation controller through CAN messages.

[0039] The brake leakage simulation controller is further configured to: if it is determined according to the actuating cylinder stroke that the actuating cylinder stroke is a return stroke, and it is determined according to the integrated brake control system push rod stroke that the integrated brake control system push rod stroke is a return stroke, then control the first port to the second port passage of the second two-position three-way valve 81 to be open, control the passage of the two-position two-way valve 82 to be closed, control the second port to the third port passage of the first two-position three-way valve 60 to be open, control the negative pressure accumulator 50 to be closed, adjust the opening degree of the flow control valve 84 so that the brake fluid flow entering the leakage circuit reaches a preset flow, collect integrated brake control system parameters, and perform brake fluid leakage analysis according to the integrated brake control system parameters at different times and different integrated brake control system push rod strokes.

[0040] Specifically, determining that the actuating cylinder stroke is a return stroke according to the actuating cylinder stroke comprises: if it is determined that the current actuating cylinder stroke is greater than a stroke threshold value, less than a target total stroke, and greater than a previous actuating cylinder stroke, then determining that the actuating cylinder stroke is a return stroke. Determining that the integrated brake control system push rod stroke is a return stroke according to the integrated brake control system push rod stroke comprises: if it is determined that the current integrated brake control system push rod stroke is greater than a stroke threshold value, less than a target total stroke, and greater than a previous integrated brake control system push rod stroke, then determining that the integrated brake control system push rod stroke is a return stroke.

[0041] The stroke threshold value and the target total stroke can be flexibly determined in advance according to experimental conditions. For example, the actuating cylinder corresponding stroke threshold value and the IBC push rod corresponding stroke threshold value can be set to 2 mm.

[0042] Specifically, when the brake leakage simulation controller controls the second two-position three-way valve 81 to have a high voltage across the coil, the first port to the second port of the second two-position three-way valve 81 is open, and the brake fluid or air can only flow from the first port to the second port, or vice versa. When the brake leakage simulation controller controls the second two-position three-way valve 81 to have a low voltage across the coil, the first port to the third port of the second two-position three-way valve 81 is open, and the brake fluid or air can only flow from the first port to the third port, or vice versa.

[0043] For the one-way valve, the brake fluid or air can only flow from the first port to the second port, and cannot flow in the opposite direction.

[0044] When the brake leakage simulation controller controls the two-position two-way valve 82 to have a high voltage across the coil, the two-position two-way valve 82 is open, and the brake fluid or air can flow from the first port to the second port, or vice versa. When the brake leakage simulation controller controls the two-position two-way valve 82 to have a low voltage across the coil, the two-position two-way valve 82 is closed.

[0045] When the brake leakage simulation controller controls the first two-position three-way valve 60 to have a high voltage across the coil, the first port to the third port of the first two-position three-way valve 60 is open, and the brake fluid or air can only flow from the first port to the third port, or vice versa. When the brake leakage simulation controller controls the first two-position three-way valve 60 to have a low voltage across the coil, the second port to the third port of the first two-position three-way valve 60 is open, and the brake fluid or air can only flow from the second port to the third port, or vice versa.

[0046] The brake leakage simulation controller can adjust the opening of the flow control valve 84 by controlling the voltage across the coil of the flow control valve 84, thereby adjusting the flow of brake fluid.

[0047] The negative pressure accumulator 50 further includes a vacuum pump, a vacuum degree sensor, and a brake fluid container. When the negative pressure accumulator 50 is turned on, the vacuum pump starts to work, and the brake fluid is drawn into the brake fluid container until the vacuum degree reaches the target value according to the vacuum degree collected by the vacuum degree sensor. When the negative pressure accumulator 50 is on standby, the vacuum pump stops working. When the negative pressure accumulator 50 is turned off, the vacuum pump stops working, and the brake fluid in the brake fluid container can automatically flow out under the action of gravity.

[0048] In the embodiment, when the actuating cylinder stroke and the IBC push rod stroke are both in the extension stroke, the brake leakage simulation controller controls the second two-position three-way valve 81 to have a high voltage, controls the two-position two-way valve 82 to have a low voltage, controls the first two-position three-way valve 60 to have a low voltage from the second port to the third port, and controls the negative pressure accumulator 50 to be closed. At this time, the leakage circuit is open, the brake fluid flows into the leakage circuit, and the working condition of the brake fluid leakage can be simulated.

[0049] Optionally, the IBC input and output performance parameters, reaction time and other parameters can be collected in real time, and the IBC performance analysis can be performed according to the real-time collected parameters, the collection time corresponding to the parameters and the IBC push rod stroke.

[0050] If it is determined that the actuating cylinder stroke is in the return stroke and the integrated brake control system push rod stroke is in the return stroke, the first port to the second port of the second two-position three-way valve 81 is controlled to be open, the two-position two-way valve 82 is controlled to be closed, the second port to the third port of the first two-position three-way valve 60 is controlled to be open, the flow control valve 84 is controlled to be fully open, and the negative pressure accumulator 50 is controlled to be open, so that the brake fluid in the leakage circuit is sucked into the negative pressure accumulator.

[0051] Specifically, determining that the actuating cylinder stroke is in the return stroke includes: if it is determined that the current actuating cylinder stroke is greater than the stroke threshold value, is less than the target total stroke, and is less than the previous actuating cylinder stroke, it is determined that the actuating cylinder stroke is in the return stroke. Determining that the integrated brake control system push rod stroke is in the return stroke includes: if it is determined that the current integrated brake control system push rod stroke is greater than the stroke threshold value, is less than the target total stroke, and is less than the previous integrated brake control system push rod stroke, it is determined that the integrated brake control system push rod stroke is in the return stroke.

[0052] In the embodiment, when the actuating cylinder stroke and the IBC push rod stroke are both in the return stroke, the leakage circuit is kept open, the flow control valve 84 is controlled to be fully open, the negative pressure accumulator 50 is opened, and the brake fluid in the leakage circuit is sucked into the negative pressure accumulator 50. For example, the vacuum pump can be opened until the negative pressure reaches 2 bar.

[0053] If it is determined that the brake fluid leakage simulation of the target brake caliper is completed, the first port to the third port of the second two-position three-way valve is controlled to be open, the two-position two-way valve is controlled to be closed, the second port to the third port of the first two-position three-way valve is controlled to be open, the negative pressure accumulator is controlled to be closed, and the flow control valve is controlled to be closed, so that the brake circuit is open and the leakage circuit is closed.

[0054] After the brake fluid leakage simulation ends, the brake leakage simulation controller controls the second two-position three-way valve 81 coil voltage to be low, controls the two-position two-way valve 82 coil voltage to be low, controls the first two-position three-way valve 60 second port to third port coil voltage to be low, and controls the negative pressure accumulator 50 to be closed, at this time, the leakage circuit is closed, the brake circuit is turned on, and the leakage reset is realized.

[0055] The technical scheme of the embodiment of the application comprises a brake circuit formed by the target brake caliper and the second two-position three-way valve matched with the target brake caliper, and a leakage circuit formed by the second two-position three-way valve matched with the target brake caliper, the two-position two-way valve, the one-way valve and the flow control valve, so that when the actuating cylinder and the IBC push rod stroke are both in the extension stroke, the brake fluid enters the leakage circuit, the scene of brake fluid leakage is simulated, and the brake fluid flow is controlled through the flow control valve. The technical scheme of the application realizes the simulation of the brake fluid leakage working condition, can accurately control the brake fluid leakage flow, improves the accuracy of the brake fluid leakage simulation, and saves time and labor cost.

[0056] Embodiment two

[0057] The embodiment of the application is based on the above-mentioned embodiment and is suitable for the simulation test of the air leakage of the brake circuit of the IBC.

[0058] The brake leakage simulation controller is further used to: if it is determined according to the actuating cylinder stroke that the actuating cylinder stroke is in the return stroke, and it is determined according to the IBC push rod stroke that the IBC push rod stroke is in the return stroke, then the first port to the second port passage of the second two-position three-way valve 81 is controlled to be opened, the passage of the two-position two-way valve 82 is controlled to be opened, the second port to the third port passage of the first two-position three-way valve 60 is controlled to be opened, the flow control valve 84 is controlled to be fully opened, and the negative pressure accumulator 50 is controlled to be closed, so that the air enters the second two-position three-way valve 81.

[0059] It should be noted that the way of determining the extension stroke and the return stroke of the actuating cylinder stroke and the IBC push rod stroke in the embodiment is the same as that in the above-mentioned embodiment, and will not be described here again.

[0060] In the embodiment, when the actuating cylinder stroke and the IBC push rod stroke are both in the return stroke, the brake leakage simulation controller controls the two ends of the second two-position three-way valve 81 coil to be high, controls the two ends of the two-position two-way valve 82 coil to be high, controls the two ends of the first two-position three-way valve 60 coil to be low, controls the flow control valve 84 to be fully opened, and controls the negative pressure accumulator 50 to be closed, at this time, the leakage circuit is turned on, and the air enters the second two-position three-way valve 81 along the leakage circuit.

[0061] If the cylinder stroke is determined to be a return stroke according to the cylinder stroke and the IBC push rod stroke is determined to be a return stroke according to the integrated brake control system push rod stroke, the first port to the third port passage of the second two-position three-way valve 81 is controlled to be open, the passage of the two-position two-way valve 82 is controlled to be closed, the second port to the third port passage of the first two-position three-way valve 60 is controlled to be open, the flow control valve 84 is controlled to be closed, and the negative pressure accumulator 50 is controlled to be closed, so that air enters the brake circuit, integrated brake control system parameters are collected, and brake circuit air leakage analysis is performed according to the integrated brake control system parameters at different times and different integrated brake control system push rod strokes.

[0062] In this embodiment, when the cylinder stroke and the IBC push rod stroke are both return strokes, the brake leakage simulation controller controls the second two-position three-way valve 81 to have a low voltage across the coil, controls the two-position two-way valve 82 to have a low voltage across the coil, controls the first two-position three-way valve 60 to have a low voltage across the coil, controls the flow control valve 84 to be closed, and controls the negative pressure accumulator 50 to be closed, so that the leakage circuit is closed and the brake circuit is open. Because air has entered the second two-position three-way valve 81 when the cylinder stroke and the IBC push rod stroke are both return strokes, air enters the brake circuit after the brake circuit is open, and at this time, the brake circuit air leakage simulation can be performed.

[0063] If it is determined that the air leakage simulation of the target brake caliper is complete, the first port to the third port passage of the second two-position three-way valve 81 is controlled to be open, the passage of the two-position two-way valve 82 is controlled to be closed, the second port to the third port passage of the first two-position three-way valve 60 is controlled to be open, the negative pressure accumulator 50 is controlled to be closed, and the flow control valve 84 is controlled to be closed, so that the brake circuit is open and the brake circuit is vented.

[0064] In this embodiment, after the brake circuit air leakage simulation is complete, the brake leakage simulation controller controls the second two-position three-way valve 81 to have a low voltage across the coil, controls the two-position two-way valve 82 to have a low voltage across the coil, controls the first two-position three-way valve 60 to have a low voltage across the coil, controls the negative pressure accumulator 50 to be closed, so that the leakage circuit is closed, the brake circuit is open, the brake circuit is vented, and the leakage is reset.

[0065] Embodiment Three

[0066] The embodiment of the present application is based on the above-mentioned embodiments and is suitable for handling of insufficient brake fluid and simulation test of the IBC in the case of insufficient brake fluid.

[0067] The integrated brake control system 20 is used to collect the brake fluid level and send the brake fluid level to the brake leakage simulation controller 10.

[0068] Specifically, the IBC can send the brake fluid level to the brake leakage simulation controller 10 through a CAN message.

[0069] The brake leakage simulation controller 10 is further configured to, if it is determined that the brake fluid is insufficient according to the brake fluid level, control the first port to the third port passage of the second two-position three-way valve 81 to be open, control the passage of the two-position two-way valve 82 to be closed, control the first port to the third port passage of the first two-position three-way valve 60 to be open, control the flow control valve 84 to be closed, control the actuator cylinder 40 to retreat to the initial position at a preset speed, and control the negative pressure accumulator 50 to be closed, so that the brake fluid in the negative pressure accumulator 50 flows into the reservoir 30.

[0070] In the embodiment, when the brake fluid level in the reservoir 30 is low, the brake leakage simulation controller 10 controls the two ends of the coil of the second two-position three-way valve 81 to be low, controls the two ends of the coil of the two-position two-way valve 82 to be low, controls the flow control valve 84 to be fully closed, and controls the two ends of the coil of the first two-position three-way valve 60 to be high, so that the leakage circuit is closed and the negative pressure circuit is turned on, the actuator cylinder is controlled to retreat quickly, and the brake fluid in the negative pressure accumulator 50 flows into the reservoir 30 along the negative pressure circuit.

[0071] The brake leakage simulation controller 10 is further configured to control the first port to the third port passage of the second two-position three-way valve 81 to be open, control the passage of the two-position two-way valve 82 to be closed, control the first port to the third port passage of the first two-position three-way valve 60 to be open, control the flow control valve 84 to be closed, and control the negative pressure accumulator 50 to be opened, so that the brake fluid in the reservoir 30 is sucked into the negative pressure accumulator 50 until it is determined that the brake fluid is insufficient according to the brake fluid level.

[0072] If it is determined that the duration of the brake fluid insufficiency is greater than a preset time, the negative pressure accumulator 50 is controlled to be in standby for simulation of brake fluid insufficiency.

[0073] A drive signal is sent to the actuator cylinder 40 to make the stroke of the actuator cylinder be a retracting stroke, and integrated brake control system parameters are collected to simulate and analyze brake fluid insufficiency according to the integrated brake control system parameters at different times and different integrated brake control system push rod strokes.

[0074] In the embodiment, simulation of insufficient brake fluid in the liquid storage tank 30 can also be performed. The brake leakage simulation controller 10 controls the second two-position three-way valve 81 to have a low voltage across the coil, controls the two-position two-way valve 82 to have a low voltage across the coil, controls the flow control valve 84 to be fully closed, and controls the first two-position three-way valve 60 to have a high voltage across the coil. At this time, the leakage circuit is closed and the negative pressure circuit is turned on. The negative pressure accumulator 50 is opened, and the vacuum pump of the negative pressure accumulator 50 causes the brake fluid in the liquid storage tank 30 to flow into the negative pressure accumulator 50 along the negative pressure circuit. When the brake fluid level in the liquid storage tank 30 is reported, the above state is maintained for a predetermined time, and the negative pressure accumulator 50 is controlled to be in standby. The driving cylinder 40 is in the extension stage, the IBC parameters are collected, and the simulation analysis of insufficient brake fluid is performed.

[0075] Embodiment Four

[0076] Figure 3 is a flowchart of a brake leakage simulation method provided by Embodiment Four of the present application. The brake leakage simulation method can be performed by a brake leakage simulation device, which can be realized in the form of hardware and / or software and can be configured in a brake leakage simulation controller.

[0077] As shown in Figure 3 , the method comprises:

[0078] S310, if it is determined that the cylinder stroke and the IBC push rod stroke are both in the extension stage, the leakage circuit is controlled to be unidirectionally turned on, so that the brake fluid flows unidirectionally into the leakage circuit, and the IBC parameters are collected to analyze the brake fluid leakage according to the IBC parameters at different times and different IBC push rod strokes.

[0079] S320, if it is determined that the cylinder stroke and the IBC push rod stroke are both in the return stage, the brake fluid in the leakage circuit is pumped out.

[0080] S330, if it is determined that the brake fluid leakage simulation is completed, the brake circuit is controlled to be turned on and the leakage circuit is controlled to be closed.

[0081] S310 is used to simulate the scenario of the cylinder and the IBC push rod in the extension stage when the brake fluid leaks, S320 is used to simulate the scenario of the cylinder and the IBC push rod in the return stage when the brake fluid leaks, and S330 is used to reset the leakage.

[0082] Figure 4is a flow chart of another brake leakage simulation method provided in the fourth embodiment of the present application, and the fourth embodiment is applicable to the case of performing brake circuit air leakage simulation test on IBC, and the brake leakage simulation method can be executed by a brake leakage simulation device, which can be realized in the form of hardware and / or software and can be configured in a brake leakage simulation controller.

[0083] As shown in Figure 4 , the method comprises:

[0084] S410, if it is determined that the actuating cylinder stroke and the integrated brake control system push rod stroke are both backstrokes, controlling the leakage circuit to be bidirectional conduction, so that air enters the brake circuit.

[0085] S420, if it is determined that the actuating cylinder stroke and the integrated brake control system push rod stroke are both forward strokes, controlling the brake circuit to be conduction, so that brake fluid flows into the brake circuit, collecting integrated brake control system parameters, and performing brake circuit air leakage analysis according to the integrated brake control system parameters at different times and different integrated brake control system push rod strokes.

[0086] S430, if it is determined that the air leakage simulation is completed, controlling the brake circuit to be conduction, and performing exhaust on the brake circuit.

[0087] , S410 is to introduce air into the brake circuit when the actuating cylinder and the IBC push rod are backstrokes, S420 is to simulate the brake circuit air leakage when the actuating cylinder and the IBC push rod are forward strokes, and S430 is to reset the leakage and exhaust the brake circuit.

[0088] Figure 5 is a flow chart of another brake leakage simulation method provided in the fourth embodiment of the present application, and the fourth embodiment is applicable to the case of performing brake circuit air leakage simulation test on IBC, and the brake leakage simulation method can be executed by a brake leakage simulation device, which can be realized in the form of hardware and / or software and can be configured in a brake leakage simulation controller.

[0089] As shown in Figure 5 , the method comprises:

[0090] S510, controlling the brake circuit to be conduction, the negative pressure circuit to be conduction, and the brake fluid in the liquid storage tank to be sucked out along the negative pressure circuit until it is determined that the brake fluid in the liquid storage tank is insufficient.

[0091] S520, controlling the actuating cylinder stroke to be a forward stroke, collecting integrated brake control system parameters, and performing brake fluid deficiency simulation analysis according to the integrated brake control system parameters at different times and different integrated brake control system push rod strokes.

[0092] S510-S520 are used to simulate the shortage of brake fluid by pumping out the brake fluid in the reservoir. When the brake fluid in the reservoir is insufficient, the negative pressure circuit is turned on, the leakage circuit is closed, the negative pressure accumulator is closed, and the brake fluid in the negative pressure accumulator flows back to the reservoir along the negative pressure circuit.

[0093] The structure of the leakage circuit, the brake circuit and the negative pressure circuit, and the turning on and closing manner have been described in the above embodiment, and will not be repeated here.

[0094] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application is not limited herein.

[0095] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A device for simulating brake leakage, characterized in that, It includes a brake leakage simulation controller, an integrated brake control system, a reservoir, an actuating cylinder, a negative pressure accumulator, a first two-position three-way valve, a flow collector, a target brake caliper, and a second two-position three-way valve, a two-position two-way valve, a check valve, and a flow control valve that are matched with the target brake caliper. The first port of the second two-position three-way valve is connected to the integrated braking control system, the second port of the second two-position three-way valve is connected to the first port of the two-position two-way valve and the first port of the one-way valve, and the third port of the second two-position three-way valve is connected to the target brake caliper. The first port of the flow control valve is connected to the second port of the two-position two-way valve and the second port of the one-way valve, and the second port of the flow control valve is connected to the flow collector; The first port of the first two-position three-way valve is connected to the liquid storage tank, the second port of the first two-position three-way valve is connected to the flow collector, and the third port of the first two-position three-way valve is connected to the negative pressure accumulator. The negative pressure accumulator is higher than the liquid storage tank in the vertical direction; The brake leakage simulation controller is used to simulate brake fluid leakage in the target brake caliper by controlling the first two-position three-way valve, the second two-position three-way valve, the two-position two-way valve, the check valve, the flow control valve, and the negative pressure accumulator.

2. The apparatus according to claim 1, characterized in that, The brake leakage simulation device also includes a displacement sensor for collecting the stroke of the actuating cylinder and sending the stroke of the actuating cylinder to the brake leakage simulation controller; The integrated braking control system is used to acquire the push rod stroke of the integrated braking control system and send the push rod stroke of the integrated braking control system to the brake leakage simulation controller.

3. The apparatus according to claim 2, characterized in that, The brake leakage simulation controller is also used for: If the actuator stroke is determined to be the outgoing stroke based on the actuator stroke, and the integrated brake control system push rod stroke is determined to be the outgoing stroke based on the integrated brake control system push rod stroke, then the passage from the first port to the second port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is closed, the passage from the second port to the third port of the first two-position three-way valve is opened, the negative pressure accumulator is closed, the opening of the flow control valve is adjusted so that the brake fluid flow rate entering the leakage circuit reaches the preset flow rate, and the integrated brake control system parameters are collected to perform brake fluid leakage analysis based on the integrated brake control system parameters under different times and different integrated brake control system push rod strokes. If the actuator stroke is determined to be the return stroke based on the actuator stroke, and the integrated brake control system push rod stroke is determined to be the return stroke based on the integrated brake control system push rod stroke, then the passage from the first port to the second port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is closed, the passage from the second port to the third port of the first two-position three-way valve is opened, the flow control valve is fully opened, and the negative pressure accumulator is opened to draw the brake fluid in the leakage circuit into the negative pressure accumulator. If the brake fluid leakage simulation of the target brake caliper is completed, the passage from the first port to the third port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is closed, the passage from the second port to the third port of the first two-position three-way valve is opened, the negative pressure accumulator is closed, and the flow control valve is closed, so that the brake circuit is connected and the leakage circuit is closed.

4. The apparatus according to claim 2, characterized in that, The brake leakage simulation controller is also used for: If the actuator stroke is determined to be the return stroke based on the actuator stroke, and the integrated brake control system push rod stroke is determined to be the return stroke based on the integrated brake control system push rod stroke, then the passage from the first port to the second port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is opened, the passage from the second port to the third port of the first two-position three-way valve is opened, the flow control valve is fully opened, and the negative pressure accumulator is closed, so that air enters the second two-position three-way valve; If the actuator stroke is determined to be the outgoing stroke based on the actuator stroke, and the integrated brake control system push rod stroke is determined to be the outgoing stroke based on the integrated brake control system push rod stroke, then the passage from the first port to the third port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is closed, the passage from the second port to the third port of the first two-position three-way valve is opened, the flow control valve is closed, and the negative pressure accumulator is closed, so that air enters the brake circuit, and the integrated brake control system parameters are collected, so as to perform brake circuit air leakage analysis based on the integrated brake control system parameters under different times and different integrated brake control system push rod strokes; If the air leakage simulation of the target brake caliper is completed, the passage from the first port to the third port of the second two-position three-way valve is opened, the passage of the two-position two-way valve is closed, the passage from the second port to the third port of the first two-position three-way valve is opened, the negative pressure accumulator is closed, and the flow control valve is closed, so as to make the brake circuit conduct and to vent the brake circuit.

5. The apparatus according to claim 3 or 4, characterized in that, The stroke of the actuator cylinder is determined as the outward stroke based on the actuator cylinder stroke, including: If it is determined that the current actuator stroke is greater than the stroke threshold, less than the target total stroke, and the current actuator stroke is greater than the previous actuator stroke, then the actuator stroke is determined to be the outgoing stroke. Determining the return stroke of the actuator cylinder based on its stroke includes: If it is determined that the current actuator stroke is greater than the stroke threshold, less than the target total stroke, and the current actuator stroke is less than the previous actuator stroke, then the actuator stroke is determined to be the return stroke. The push rod stroke of the integrated brake control system is determined as the outward stroke based on the push rod stroke, including: If it is determined that the current push rod stroke of the integrated braking control system is greater than the stroke threshold and less than the target total stroke, and the current push rod stroke of the integrated braking control system is greater than the push rod stroke of the previous integrated braking control system, then the push rod stroke of the integrated braking control system is determined to be the outgoing stroke. The return stroke of the integrated brake control system push rod is determined based on the push rod stroke of the integrated brake control system, including: If it is determined that the current push rod stroke of the integrated brake control system is greater than the stroke threshold but less than the target total stroke, and the current push rod stroke of the integrated brake control system is less than the push rod stroke of the previous integrated brake control system, then the push rod stroke of the integrated brake control system is determined to be the return stroke.

6. The apparatus according to claim 1, characterized in that, The integrated braking control system is used to collect the brake fluid level and send the brake fluid level to the brake leakage simulation controller; The brake leakage simulation controller is further configured to, if it is determined from the brake fluid level that the brake fluid is insufficient, control the passage from the first port to the third port of the second two-position three-way valve to open, control the passage of the two-position two-way valve to close, control the passage from the first port to the third port of the first two-position three-way valve to open, control the flow control valve to close, control the actuating cylinder to retract to the initial position at a preset speed, and control the negative pressure accumulator to close, so that the brake fluid in the negative pressure accumulator flows into the reservoir.

7. The apparatus according to claim 6, characterized in that, The brake leakage simulation controller is also used to control the opening of the passage from the first port to the third port of the second two-position three-way valve, control the closing of the passage of the two-position two-way valve, control the opening of the passage from the first port to the third port of the first two-position three-way valve, control the closing of the flow control valve, and control the opening of the negative pressure accumulator to draw the brake fluid in the reservoir into the negative pressure accumulator until the brake fluid level determines that the brake fluid is insufficient. If it is determined that the duration of insufficient brake fluid is longer than a preset time, the negative pressure accumulator is put into standby mode to simulate insufficient brake fluid. A drive signal is sent to the actuating cylinder so that the stroke of the actuating cylinder is the outward stroke. The parameters of the integrated brake control system are collected to perform a simulation analysis of insufficient brake fluid based on the parameters of the integrated brake control system under different times and different push rod strokes.

8. A method for simulating brake leakage, characterized in that, The method is performed by the brake leakage simulation device according to any one of claims 1-7, and the method includes: If it is determined that both the actuator cylinder stroke and the integrated brake control system push rod stroke are outward strokes, then the control leakage circuit is unidirectionally open to allow brake fluid to flow into the leakage circuit in one direction. The parameters of the integrated brake control system are collected to perform brake fluid leakage analysis based on the integrated brake control system parameters under different times and different push rod strokes. If it is determined that both the actuator cylinder stroke and the integrated brake control system push rod stroke are return strokes, then the brake fluid in the leakage circuit will be drawn out. If the brake fluid leakage simulation is completed, the brake circuit is activated and the leakage circuit is deactivated.

9. The method according to claim 8, characterized in that, The method further includes: If it is determined that both the actuator cylinder stroke and the push rod stroke of the integrated brake control system are return strokes, then the control leakage circuit is bidirectionally open to allow air to enter the brake circuit; If it is determined that both the actuator cylinder stroke and the integrated brake control system push rod stroke are outward strokes, then the control brake circuit is turned on to allow brake fluid to flow into the brake circuit. The parameters of the integrated brake control system are collected to perform air leakage analysis of the brake circuit based on the parameters of the integrated brake control system under different times and different push rod strokes. If the air leak simulation is confirmed to be complete, the brake circuit is activated and the air is vented from the brake circuit.

10. The method according to claim 8, characterized in that, The method further includes: The brake circuit is activated, the negative pressure circuit is activated, and the brake fluid in the reservoir is drawn out along the negative pressure circuit until it is determined that the brake fluid in the reservoir is insufficient. The stroke of the control actuator is the outward stroke. Parameters of the integrated brake control system are collected to simulate and analyze insufficient brake fluid based on the parameters of the integrated brake control system under different times and different push rod strokes.

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