Hydraulic brake system fluid path detection method, detection device, and vehicle

Abstract

The embodiment of the application provides a hydraulic brake system liquid path detection method, a detection device and a vehicle. The hydraulic brake system liquid path detection method comprises the following steps: closing a piston pump valve, so that a motor piston pump is in a first closed space; building pressure on the first closed space by the motor piston pump; when the stroke of the motor piston pump reaches a first stroke A, the pressure of the first closed space is a first pressure; keeping the pressure of the first closed space at the first pressure for a first time A, and when the stroke of the motor piston pump reaches a second stroke A; opening the piston pump valve, keeping the pressure of the first closed space at the first pressure, and operating the motor piston pump; when the stroke of the motor piston pump reaches a third stroke A after the motor piston pump operates for a second time A; and when the difference between the third stroke A and the second stroke A is less than or equal to a set threshold A, the detection parameter of the first closed space in the hydraulic brake system liquid path is qualified.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of detection, and in particular, relates to a hydraulic braking system liquid path detection method, a detection device and a vehicle. BACKGROUND

[0002] Automobiles are prone to brake failure in the case of emergency braking, which may further cause traffic accidents. In the prior art, a vehicle usually sets a liquid level sensor in a brake liquid tank to detect whether a braking system is normal. When the liquid level sensor detects that the liquid level is below the scale line, an alarm is given, thereby reducing the risk of too little brake fluid.

[0003] However, the liquid level sensor can only monitor the liquid level of the brake fluid in the brake liquid tank, and the detection accuracy is poor, and there is a high safety hazard. Therefore, how to accurately determine the leakage position under the premise of ensuring the safety of the vehicle and the person, and ensure the stability of the vehicle braking function is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] An object of an embodiment of the application is to provide a new technical solution of a hydraulic braking system liquid path detection method, a detection device and a vehicle.

[0005] According to a first aspect of an embodiment of the application, a hydraulic braking system liquid path detection method is provided, comprising:

[0006] The piston pump valve is closed, so that the motor piston pump is in a first closed space;

[0007] The first closed space is pressurized by the motor piston pump, and when the stroke of the motor piston pump reaches a first stroke A, the pressure of the first closed space is a first pressure;

[0008] When the pressure of the first closed space is maintained at the first pressure for a first time A, the stroke of the motor piston pump reaches a second stroke A;

[0009] The piston pump valve is opened, the pressure of the first closed space is maintained at the first pressure, and the motor piston pump is operated, and when the motor piston pump is operated for a second time A, the stroke of the motor piston pump reaches a third stroke A;

[0010] When the difference between the third stroke A and the second stroke A is less than or equal to a set threshold A, the detection parameter of the first closed space in the hydraulic braking system liquid path is qualified.

[0011] Optionally, the motor piston pump has a nominal stroke A;

[0012] In the case that the difference between the third stroke A and the second stroke A is less than or equal to a set threshold value A and the first stroke A is less than or equal to the nominal stroke A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is qualified.

[0013] Optionally, in the case that the difference between the third stroke A and the second stroke A is less than or equal to a set threshold value A and the first stroke A is greater than the nominal stroke A, the air content of the first closed space in the hydraulic brake system fluid circuit is greater than a set value A.

[0014] Optionally, further comprising:

[0015] opening the piston pump valve and the wheel cylinder inlet valve, closing the master cylinder valve and the wheel cylinder outlet valve, so that the motor piston pump and the wheel cylinder are in the second closed space together;

[0016] building pressure in the second closed space by the motor piston pump, and in the case that the stroke of the motor piston pump reaches a first stroke B, the pressure of the second closed space is a second pressure;

[0017] maintaining the pressure of the second closed space at the second pressure for a first time B, and in the case that the stroke of the motor piston pump reaches a second stroke B;

[0018] opening the piston pump valve, maintaining the pressure of the second closed space at the second pressure, and operating the motor piston pump, and in the case that the motor piston pump operates for a second time B, the stroke of the motor piston pump reaches a third stroke B;

[0019] In the case that the difference between the third stroke B and the second stroke B is less than or equal to a set threshold value B, the detection parameter of the second closed space in the hydraulic brake system fluid circuit is qualified.

[0020] Optionally, the motor piston pump has a low nominal stroke and a high nominal stroke, and the hydraulic brake system fluid circuit detection method further comprises:

[0021] opening the piston pump valve, the master cylinder valve and the wheel cylinder inlet valve, closing the simulator valve, the detection valve and the wheel cylinder outlet valve, so that the motor piston pump, the wheel cylinder and the brake master cylinder are in the third closed space together;

[0022] building pressure in the third closed space by the motor piston pump, and in the case that the stroke of the motor piston pump reaches a first stroke C, the pressure of the third closed space is a third pressure;

[0023] In the case that the first stroke C is between the low nominal stroke and the high nominal stroke, the detection parameter of the third closed space in the hydraulic brake system fluid circuit is qualified.

[0024] Optionally, in the case that the first stroke C is less than the low position calibration stroke, the opening of at least one of the piston pump valve, the master cylinder valve and the wheel cylinder inlet valve fails.

[0025] Optionally, the motor piston pump has a calibration stroke D, and the hydraulic brake system fluid circuit detection method further comprises:

[0026] The piston pump valve, the master cylinder valve, the wheel cylinder inlet valve and the simulator valve are opened, and the detection valve and the wheel cylinder outlet valve are closed, so that the motor piston pump, the wheel cylinder, the brake master cylinder and the simulator are in the fourth sealed space together;

[0027] The fourth sealed space is pressurized by the motor piston pump, and in the case that the stroke of the motor piston pump reaches a first stroke D, the pressure of the fourth sealed space is a fourth pressure;

[0028] In the case that the fourth sealed space is kept sealed and a first time D elapses, the stroke of the motor piston pump reaches a second stroke D, and the pressure of the brake master cylinder reaches a fourth pressure D1;

[0029] In the case that the fourth sealed space is kept sealed and a second time D elapses, the stroke of the motor piston pump reaches a third stroke D, and the pressure of the brake master cylinder reaches a fourth pressure D2;

[0030] In the case that the first stroke D is less than or equal to the calibration stroke D, the difference between the third stroke D and the second stroke D is less than or equal to a set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to a set pressure D, the detection parameter of the fourth sealed space in the hydraulic brake system fluid circuit is qualified.

[0031] Optionally, in the case that the first stroke D is greater than the calibration stroke D, the difference between the third stroke D and the second stroke D is less than or equal to a set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to a set pressure D, the air content of the fourth sealed space in the hydraulic brake system fluid circuit is greater than a set value D.

[0032] Optionally, the pedal includes a low position pedal stroke and a high position pedal stroke, and the hydraulic brake system fluid circuit detection method further comprises:

[0033] The master cylinder valve and the simulator valve are closed, so that the brake master cylinder is in a fifth sealed space;

[0034] The fifth sealed space is pressurized by the pedal, and in the case that the stroke of the pedal reaches a first stroke E, the pressure of the fifth sealed space is a fifth pressure;

[0035] In a case where the first stroke E is between the low pedal stroke and the high pedal stroke,

[0036] The detection parameter of the fifth closed space in the hydraulic brake system fluid circuit is qualified.

[0037] Optionally, the detection parameter of the hydraulic brake system fluid circuit comprises the air content and the sealing property of the hydraulic brake system fluid circuit.

[0038] According to a second aspect of the present application, a hydraulic brake system fluid circuit detection device is provided for fluid circuit detection of a hydraulic brake system, comprising:

[0039] a control unit configured to control the opening and closing of the piston pump valve and the start and stop of the motor piston pump;

[0040] a first stroke detection unit configured to detect the stroke of the motor piston pump;

[0041] a first pressure detection unit configured to detect the pressure of the first closed space;

[0042] In a case where the stroke of the motor piston pump detected by the first stroke detection unit reaches a first stroke A, the first pressure detection unit detects the pressure of the first closed space as a first pressure;

[0043] In a case where the pressure of the first closed space is maintained at the first pressure for a first time A, the first stroke detection unit detects that the stroke of the motor piston pump reaches a second stroke A;

[0044] In a case where the pressure of the first closed space is maintained at the first pressure and the motor piston pump is operated for a second time A, the first stroke detection unit detects that the stroke of the motor piston pump reaches a third stroke A;

[0045] In a case where the difference between the third stroke A and the second stroke A is less than or equal to a set threshold value A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is qualified.

[0046] According to a third aspect of the present application, a vehicle is provided, comprising the hydraulic brake system fluid circuit detection device of the second aspect.

[0047] According to a fourth aspect of the present application, a computer readable storage medium is provided, having a computer program stored thereon, which, when executed by a processor, implements the hydraulic brake system fluid circuit detection method of the first aspect.

[0048] One technical effect of the present application is that:

[0049] The embodiment of the present application provides a hydraulic brake system liquid path detection method, the hydraulic brake system liquid path detection method comprises the following steps: closing a piston pump valve, so that the motor piston pump is in a first closed space; pressure is built in the first closed space by the motor piston pump, the pressure of the first closed space is a first pressure when the stroke of the motor piston pump reaches a first stroke A; the pressure of the first closed space is kept at the first pressure for a first time A, and the stroke of the motor piston pump reaches a second stroke A; the piston pump valve is opened, the pressure of the first closed space is kept at the first pressure, and the motor piston pump is operated, the stroke of the motor piston pump reaches a third stroke A when the motor piston pump is operated for a second time A; in the case that the difference between the third stroke A and the second stroke A is less than or equal to a set threshold A, the detection parameter of the first closed space in the hydraulic brake system liquid path is qualified, and whether the hydraulic brake system liquid path parameter is qualified can be detected, and the stability of the brake function of the hydraulic brake system is ensured.

[0050] Other features and advantages of the present application will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0051] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0052] Figure 1 A hydraulic brake system liquid path detection method provided by the embodiment of the present application is shown in the schematic diagram;

[0053] Figure 2 Another hydraulic brake system liquid path detection method provided by the embodiment of the present application is shown in the schematic diagram;

[0054] Figure 3 A flow chart of the hydraulic brake system liquid path detection method provided by the embodiment of the present application is shown in the schematic diagram;

[0055] Figure 4 A hydraulic brake system liquid path detection device provided by the embodiment of the present application is shown in the schematic diagram;

[0056] Figure 5 The detection of the hydraulic brake system by the hydraulic brake system liquid path detection device provided by the embodiment of the present application is shown in the schematic diagram.

[0057] Wherein:

[0058] 100 hydraulic brake system; 200 oil tank; 201 detection valve; 202 master cylinder; 203 second stroke detection unit; 204 pedal; 205 second pressure detection unit; 206 simulator valve; 207 simulator; 208 master cylinder valve; 209 control piston pump valve; 210 first pressure detection unit; 211 motor piston pump; 212 motor; 213 first stroke detection unit; 214 wheel cylinder inlet valve; 215 wheel cylinder outlet valve; 216 wheel cylinder;

[0059] 101 hydraulic brake system circuit detection device; 300 control unit. DETAILED DESCRIPTION

[0060] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values, unless specifically stated otherwise, do not limit the scope of the present application.

[0061] Embodiments of the present application will be described in detail below with reference to drawings. The embodiments described below by reference to drawings are exemplary and are for the purpose of explaining the present application and should not be understood as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of the present application.

[0062] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0063] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In the description of the application, it should be noted that unless otherwise explicitly defined and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0065] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0066] Referring to Figure 1 The embodiment of the application provides a hydraulic brake system fluid circuit detection method, the hydraulic brake system fluid circuit detection method includes a detection method TEST1 for whether there is air or leakage at the position of a motor piston pump, and the TEST1 specifically includes:

[0067] S101, closing a piston pump valve to make the motor piston pump in a first closed space;

[0068] S102, building pressure in the first closed space by the motor piston pump, and when the stroke of the motor piston pump reaches a first stroke A, the pressure of the first closed space is a first pressure;

[0069] S103, keeping the pressure of the first closed space at the first pressure for a first time A, and when the stroke of the motor piston pump reaches a second stroke A;

[0070] S104, opening the piston pump valve, keeping the pressure of the first closed space at the first pressure, and operating the motor piston pump, and when the motor piston pump operates for a second time A, the stroke of the motor piston pump reaches a third stroke A;

[0071] S105, in the case that the difference between the third stroke A and the second stroke A is less than or equal to a set threshold A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is qualified.

[0072] Specifically, the liquid in the first closed space meets the P-V characteristic curve, that is, a certain pressure P corresponds to a certain liquid volume V, if there is no leakage or air in the first closed space of the hydraulic brake system, the greater the liquid volume V, the greater the pressure P; if there is leakage or air in the first closed space of the hydraulic brake system, the required liquid volume V under the same pressure P is greater. Therefore, the stroke of the motor piston pump can reflect the increase of the volume V.

[0073] Specifically, in the S103 step, maintaining the pressure of the first closed space at the first pressure and for the first time A can obtain a stable motor piston pump stroke under static conditions; in the S104 step, operating the motor piston pump for the second time A can obtain a recognizable and stable motor piston pump stroke under dynamic conditions.

[0074] The threshold A can be calibrated according to the specific structure of the hydraulic brake system. If there is no air and leakage in the first closed space of the hydraulic brake system, the absolute values of the third stroke A and the second stroke A are measured, and the threshold A is determined according to the difference between the absolute values. If there is no leakage and air in the first closed space, the third stroke A is consistent with the second stroke A.

[0075] If the difference between the third stroke A and the second stroke A is greater than the threshold A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is unqualified.

[0076] In addition, after the detection of the first closed space in the hydraulic brake system fluid circuit is completed, the stroke of the motor piston pump can be controlled to return to zero, and all valve bodies can be controlled to return to the power-off state to end the test process.

[0077] The hydraulic brake system fluid circuit detection method can be used to detect whether the hydraulic brake system fluid circuit leaks or whether there is residual air, and can clearly determine the specific position of the leakage and the air, thereby ensuring the stability of the brake function of the hydraulic brake system.

[0078] Further, the hydraulic brake system fluid circuit detection method can be used for detection of the hydraulic brake system at the end of assembly and maintenance detection of the hydraulic brake system.

[0079] The hydraulic brake system fluid circuit detection method provided by the embodiment of the application includes closing a piston pump valve to place a motor piston pump in a first closed space; building pressure in the first closed space by the motor piston pump, wherein the stroke of the motor piston pump reaches a first stroke A, and the pressure of the first closed space is a first pressure; maintaining the pressure of the first closed space at the first pressure for a first time A, wherein the stroke of the motor piston pump reaches a second stroke A; opening the piston pump valve, maintaining the pressure of the first closed space at the first pressure, and operating the motor piston pump, wherein the stroke of the motor piston pump reaches a third stroke A when the motor piston pump operates for a second time A; and in the case that the difference between the third stroke A and the second stroke A is less than or equal to a threshold A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is qualified, which can be used to detect whether the hydraulic brake system fluid circuit parameter is qualified, thereby ensuring the stability of the brake function of the hydraulic brake system.

[0080] Optionally, the motor piston pump has a calibration stroke A;

[0081] In the case that the difference between the third stroke A and the second stroke A is less than or equal to the set threshold value A and the first stroke A is less than or equal to the calibration stroke A, the detection parameter of the first closed space in the hydraulic brake system fluid circuit is qualified.

[0082] Specifically, the first stroke A is the stroke required for the motor piston pump to reach the first pressure for the first time. If the first stroke A is too large, it can be considered that there is air or leakage in the first closed space at this time.

[0083] The specific value of the calibration stroke A can be calibrated according to the specific structure of the hydraulic brake system. Generally, the distribution result of the first stroke A value measured when the motor piston pump builds pressure to the first pressure under the normal condition without air and leakage is determined.

[0084] In the case that the difference between the third stroke A and the second stroke A is less than or equal to the set threshold value A and the first stroke A is less than or equal to the calibration stroke A, the first closed space without air and leakage can be detected during the motor piston pump pressure building process, and the change during the operation of the motor piston pump is further used to confirm that the first closed space is without air and leakage, thereby ensuring the correctness of the judgment of whether the detection parameter of the first closed space is qualified.

[0085] Optionally, in the case that the difference between the third stroke A and the second stroke A is less than or equal to the set threshold value A and the first stroke A is greater than the calibration stroke A, the air content in the first closed space in the hydraulic brake system fluid circuit is greater than the set value A.

[0086] Specifically, in the case that the first stroke A is greater than the calibration stroke A, it can be considered that there is air and / or leakage in the first closed space at this time. Further, in the case that the difference between the third stroke A and the second stroke A is less than or equal to the set threshold value A, it can be considered that the sealing performance of the first closed space is good, that is, the problem of leakage in the first closed space is excluded, so that it can be confirmed that there is air in the first closed space of the hydraulic brake system, and the fluid circuit of the hydraulic brake system is detected in time and accurately.

[0087] In another embodiment, if the difference between the third stroke A and the second stroke A is greater than the set threshold value A and the first stroke A is greater than the calibration stroke A, then the first closed space of the hydraulic brake system at least has a leakage problem.

[0088] Optionally, the hydraulic brake system fluid circuit detection method further comprises a detection method TEST2 for whether there is air or leakage at the position of the wheel cylinder system, and TEST2 specifically comprises:

[0089] S201, open the piston pump valve and the wheel cylinder inlet valve, close the master cylinder valve and the wheel cylinder outlet valve, so that the motor piston pump and the wheel cylinder are in the second closed space together;

[0090] S202, build pressure in the second closed space by the motor piston pump, and when the stroke of the motor piston pump reaches the first stroke B, the pressure of the second closed space is the second pressure;

[0091] S203, keep the pressure of the second closed space at the second pressure for the first time B, and the stroke of the motor piston pump reaches the second stroke B;

[0092] S204, open the piston pump valve, keep the pressure of the second closed space at the second pressure, and run the motor piston pump, and when the motor piston pump runs for the second time B, the stroke of the motor piston pump reaches the third stroke B;

[0093] S205, in the case that the difference between the third stroke B and the second stroke B is less than or equal to a set threshold B, the detection parameter of the second closed space in the hydraulic brake system circuit is qualified.

[0094] Specifically, in the S203 step, keeping the pressure of the second closed space at the second pressure for the first time B can obtain a stable motor piston pump stroke; in the S204 step, the motor piston pump runs for the second time B to obtain a recognizable and stable motor piston pump stroke under dynamic conditions.

[0095] The set threshold B can be calibrated according to the specific structure of the hydraulic brake system. If there is no air and leakage in the second closed space of the hydraulic brake system, the absolute values of the third stroke B and the second stroke B are measured, and the set threshold B is determined according to the difference between the absolute values. If there is no leakage and air in the second closed space, the third stroke B is consistent with the second stroke B.

[0096] If the difference between the third stroke B and the second stroke B is greater than the set threshold B, the detection parameter of the second closed space in the hydraulic brake system circuit is unqualified.

[0097] Specifically, the motor piston pump has a calibrated stroke B, and the specific value of the calibrated stroke B can be calibrated according to the specific structure of the hydraulic brake system. Generally, the distribution result of the first stroke B value when the motor piston pump builds pressure to the second pressure under normal conditions without air and leakage is determined.

[0098] In the case that the difference between the third stroke B and the second stroke B is less than or equal to a set threshold value B and the first stroke B is less than or equal to the nominal stroke B, the second closed space can be further confirmed to be free of air and leakage by the change in the operation of the motor piston pump, based on the detection of the second closed space being free of air and leakage during the pressure building of the motor piston pump, thereby ensuring the correctness of the judgment on whether the detection parameters of the second closed space are qualified.

[0099] In the case that the difference between the third stroke B and the second stroke B is less than or equal to a set threshold value B and the first stroke B is greater than the nominal stroke B, the air content in the second closed space of the hydraulic brake system hydraulic circuit is greater than a set value B, and it can be confirmed that there is air in the second closed space of the hydraulic brake system, so as to accurately detect the hydraulic circuit of the hydraulic brake system in time.

[0100] Optionally, the motor piston pump has a low nominal stroke and a high nominal stroke, and the hydraulic brake system hydraulic circuit detection method includes a detection method TEST3 for whether there is air or leakage at the position of the brake master cylinder system, and the TEST3 specifically includes:

[0101] S301, opening the piston pump valve, the master cylinder valve and the wheel cylinder inlet valve, and closing the simulator valve, the detection valve and the wheel cylinder outlet valve, so that the motor piston pump, the wheel cylinder and the brake master cylinder are together in a third closed space;

[0102] S302, building pressure in the third closed space by the motor piston pump, and in the case that the stroke of the motor piston pump reaches a first stroke C, the pressure of the third closed space is a third pressure;

[0103] S303, in the case that the first stroke C is between a low nominal stroke and a high nominal stroke, the detection parameters of the third closed space in the hydraulic brake system hydraulic circuit are qualified.

[0104] Specifically, since the motor piston pump, the wheel cylinder and the brake master cylinder are together in the third closed space, the pressure of the third closed space is also the pressure of the brake master cylinder. The low nominal stroke and the high nominal stroke of the motor piston pump can be determined according to the actual test stroke value range of the motor piston pump building pressure to the third pressure when the third closed space is free of air and leakage.

[0105] In the case that the first stroke C is between the low nominal stroke and the high nominal stroke, the third closed space can be detected to be free of air and leakage during the pressure building of the motor piston pump, and in the case that the first stroke C is greater than the high nominal stroke, there is air or leakage in the third closed space, so as to accurately judge whether the detection parameters of the third closed space are qualified.

[0106] Optionally, when the first stroke C is less than a low-position calibrated stroke, at least one of the piston pump valve, the master cylinder valve, and the wheel cylinder inlet valve fails to open.

[0107] When the first stroke C is smaller than the low-position calibration stroke, that is, the actual value of the third enclosed space is smaller than the enclosed space of the motor piston pump, wheel cylinder and brake master cylinder together, so that the stroke of the motor piston pump reaches the first stroke C in advance, it can be determined that at least one of the piston pump valve, the master cylinder valve and the wheel cylinder liquid inlet valve fails to open, and the detection process can be adjusted in a timely and accurate manner.

[0108] Optionally, the motor piston pump has a calibrated stroke D, and the hydraulic brake system fluid circuit detection method includes a detection method TEST4 for determining whether there is air or leakage at the simulator system position. TEST4 specifically includes:

[0109] S401, opening the piston pump master cylinder valve, wheel cylinder inlet valve, and simulator valve, and closing the detection valve and wheel cylinder outlet valve, so that the motor piston pump, wheel cylinder, brake master cylinder, and simulator are all in the fourth closed space;

[0110] S402, the motor piston pump is used to build pressure in the fourth enclosed space. When the stroke of the motor piston pump reaches the first stroke D, the pressure in the fourth enclosed space is the fourth pressure; that is, the pressure of the brake master cylinder

[0111] S403, maintaining the fourth closed space in a sealed state and after a first time D, the stroke of the motor piston pump reaches a second stroke D, and the pressure of the brake master cylinder reaches a fourth pressure D1;

[0112] S404, while maintaining the sealed state of the fourth enclosed space and after the second time D has passed, the stroke of the motor piston pump reaches the third stroke D, and the pressure of the brake master cylinder reaches the fourth pressure D2;

[0113] S405. When the first stroke D is less than or equal to the calibrated stroke D, the difference between the third stroke D and the second stroke D is less than or equal to the set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to the set pressure D, the detection parameters of the fourth enclosed space in the hydraulic brake system fluid circuit are qualified.

[0114] Specifically, in step S403, the fourth enclosed space is kept sealed for a first time D in order to obtain a stable motor piston pump stroke and the pressure of the brake master cylinder; in step S404, the fourth enclosed space is kept sealed for a second time D in order to obtain an identifiable and stable motor piston pump stroke and the pressure of the brake master cylinder.

[0115] Specifically, when the first stroke D is less than or equal to the calibration stroke D, it can be initially considered that the fourth closed space is free of air and leakage during the motor piston pump pressure building process; and when the fourth closed space sealing state is maintained in sequence through the first time D and the second time D, the motor piston pump stroke and the brake master cylinder pressure change can be observed through a two-step static process; if the difference between the third stroke D and the second stroke D is less than or equal to a set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to a set pressure D, it can be confirmed that the detection parameters of the fourth closed space in the hydraulic brake system fluid circuit are qualified, and the correctness of the judgment of whether the detection parameters of the fourth closed space are qualified is ensured.

[0116] In an embodiment, when the first stroke D is greater than the calibration stroke D, it can be considered that the fourth closed space has air or leakage at this time.

[0117] Alternatively, when the first stroke D is greater than the calibration stroke D, the difference between the third stroke D and the second stroke D is less than or equal to a set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to a set pressure D, the air content of the fourth closed space in the hydraulic brake system fluid circuit is greater than a set value D.

[0118] Specifically, when the first stroke D is greater than the calibration stroke D, it can be considered that the fourth closed space has air and / or leakage at this time; further, when the difference between the third stroke D and the second stroke D is less than or equal to a set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to a set pressure D, it can be considered that the sealing of the fourth closed space is good, that is, the problem of leakage of the fourth closed space is excluded, so it can be confirmed that there is air in the fourth closed space of the hydraulic brake system, and the fluid circuit of the hydraulic brake system is detected in time and accurately.

[0119] It is noted that the methods of TEST1, TEST2, TEST3 and TEST4 described above are universal, that is, TEST1, TEST2, TEST3 and TEST4 four methods can be exchanged for detection, such as using the method of TEST3 to detect whether there is air or leakage at the position of the motor piston pump; using the method of TEST1 to detect whether there is air or leakage at the position of the brake master cylinder system, or using the method of TEST1 to detect whether there is air or leakage at the position of the simulator system.

[0120] In addition, in the hydraulic brake system fluid circuit detection method provided by the embodiments of the present application, the detection can be performed in the order of TEST1, TEST2, TEST3 and TEST4, for example,Figure 2 The first detection process can be any one of TEST1, TEST2, TEST3 and TEST4, that is, the detection can be performed on the closed space formed by one component, or the detection can be performed on the closed space formed by multiple components together, and if the closed space formed by multiple components is qualified, the closed space formed by multiple components is qualified.

[0121] In one embodiment, the first test method adopts TEST4, and if the first stroke D is less than or equal to the calibration stroke D, the difference between the third stroke D and the second stroke D is less than or equal to the set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to the set pressure D, the detection parameter of the fourth closed space in the hydraulic brake system fluid circuit is qualified, that is, the detection of the space formed by the motor piston pump, the wheel cylinder, the brake master cylinder and the simulator is qualified, and the detection step can be simplified.

[0122] Optionally, the pedal includes a low pedal stroke and a high pedal stroke, and the hydraulic brake system fluid circuit detection method includes a detection method TEST5 for whether there is air or leakage at the position of the brake master cylinder, and TEST5 specifically includes:

[0123] S501, the master cylinder valve and the simulator valve are closed, so that the brake master cylinder is in a fifth closed space;

[0124] S502, the fifth closed space is pressurized by the pedal, and when the stroke of the pedal reaches a first stroke E, the pressure of the fifth closed space is a fifth pressure;

[0125] S503, when the first stroke E is between the low pedal stroke and the high pedal stroke,

[0126] The detection parameter of the fifth closed space in the hydraulic brake system fluid circuit is qualified.

[0127] Specifically, since the pedal is arranged close to the brake master cylinder, the fifth closed space including the brake master cylinder is pressurized by the pedal, which can shorten the path for pressurizing the brake master cylinder, and the brake master cylinder can be quickly pressurized by a small pedal stroke; for example, if there is no air and leakage in the closed space, the point at which the actual pedal feedback force is relatively stable can be 3MPa.

[0128] If there is air or leakage in the fifth closed space, the idle stroke for pressurizing the brake master cylinder is too large, and the pedal stroke needs to be greater than the high pedal stroke to reach the fifth pressure; if the idle stroke for pressurizing the brake master cylinder is very small, only a small pedal stroke is needed to reach the fifth pressure.

[0129] Specifically, when the first stroke E is between the low pedal stroke and the high pedal stroke, the detection parameter of the fifth closed space in the hydraulic brake system fluid circuit is qualified; when the first stroke E is greater than the high pedal stroke, the fifth closed space has air or excessive air gap; and when the first stroke E is less than the low pedal stroke, the air gap for building pressure of the brake master cylinder is too small, the pedal stroke is small, and the pedal stroke needs to be adjusted.

[0130] Optionally, the detection parameter of the hydraulic brake system fluid circuit includes the air content and the sealing of the hydraulic brake system fluid circuit.

[0131] Specifically, the hydraulic brake system provides braking force by building pressure through the fluid circuit to quickly realize braking of the vehicle; and if there is air or leakage in the fluid circuit, the building pressure speed and building pressure of the hydraulic brake system fluid circuit are affected, which delays or fails the braking of the vehicle.

[0132] The detection parameter of the hydraulic brake system fluid circuit includes the air content and the sealing of the hydraulic brake system fluid circuit, that is, the air content and the sealing of the hydraulic brake system fluid circuit can be detected by the hydraulic brake system fluid circuit detection method to ensure the timeliness and braking effect of the hydraulic brake system.

[0133] Referring to Figure 3 and Figure 4 , the embodiment of the application further provides a hydraulic brake system fluid circuit detection device 101 for fluid circuit detection of a hydraulic brake system 100, the hydraulic brake system fluid circuit detection device 101 comprising:

[0134] a control unit 300 for controlling the opening and closing of the piston pump valve 209 and the starting and stopping of the motor piston pump 211;

[0135] a first stroke detection unit 213 for detecting the stroke of the motor piston pump;

[0136] a first pressure detection unit 210 for detecting the pressure of the first closed space;

[0137] When the first stroke detection unit 213 detects that the stroke of the motor piston pump reaches a first stroke A, the first pressure detection unit 210 detects that the pressure of the first closed space is a first pressure;

[0138] When the pressure of the first closed space is maintained at the first pressure for a first time A, the first stroke detection unit 213 detects that the stroke of the motor piston pump reaches a second stroke A;

[0139] The first closed space is kept at the first pressure, and the motor piston pump is operated, and the first stroke detection unit 213 detects that the stroke of the motor piston pump reaches the third stroke A in the case that the motor piston pump is operated for a second time A.

[0140] In the case that the difference between the third stroke A and the second stroke A is less than or equal to a set threshold value A, the detection parameter of the first closed space in the hydraulic brake system hydraulic circuit is qualified.

[0141] Specifically, in the hydraulic brake system 100, an oil tank 200, a detection valve 201, a brake master cylinder 202, a second stroke detection unit 203, a pedal 204, a second pressure detection unit 205, a simulator valve 206, a simulator 207, a master cylinder valve 208, a control piston pump valve 209, a first pressure detection unit 210, a motor piston pump 211, a motor 212, a first stroke detection unit 213, a wheel cylinder inlet valve 214, a wheel cylinder outlet valve 215, and a wheel cylinder 216 are further included; the motor 212 is connected with the motor piston pump 211, the motor piston pump 211 is connected with the piston pump valve 209, the first pressure detection unit 210 can be a piston pump pressure sensor, used for measuring the pressure of the motor piston pump 211, and the first stroke detection unit 213 can be a motor position sensor, used for measuring the stroke of the motor piston pump 211.

[0142] The piston pump valve 209 is connected with the master cylinder valve 208 and the wheel cylinder inlet valve 214, the wheel cylinder inlet valve 214 is connected with the wheel cylinder outlet valve 215 and the wheel cylinder 216, the master cylinder valve 208 is connected with the simulator valve 206 and the brake master cylinder 202, the simulator valve 206 is connected with the simulator 207, the second pressure detection unit 205 can be a master cylinder pressure sensor, used for measuring the pressure of the brake master cylinder, the oil tank 200 is connected with the brake master cylinder 202, the detection valve 201 is arranged between the oil tank 200 and the brake master cylinder 202, the pedal 204 is connected with the brake master cylinder 202, and the second stroke detection unit 203 can be a push rod stroke sensor, used for measuring the stroke of the pedal 204.

[0143] The hydraulic brake system hydraulic circuit detection device 101 can detect whether the sealing performance of the hydraulic brake system 100 and the air content of the hydraulic brake system hydraulic circuit are qualified, so as to ensure the timeliness and braking effect of the hydraulic brake system 100.

[0144] The embodiment of the present application further provides a vehicle, which comprises the hydraulic brake system hydraulic circuit detection device.

[0145] Specifically, the vehicle comprises a hydraulic braking system, and the hydraulic braking system circuit detection device of the vehicle can detect whether the sealing of the hydraulic braking system circuit and the air content of the hydraulic braking system circuit are qualified, so as to ensure the timeliness and braking effect of the vehicle.

[0146] The embodiment of the application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the hydraulic braking system circuit detection method according to any one of the method embodiments.

[0147] The application can be a system, a method and / or a computer program product. The computer program product can include a computer readable storage medium having computer readable program instructions embodied therewith to cause a processor to implement various aspects of the application.

[0148] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched tape, a magneto-optical storage device, or any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0149] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0150] Computer readable program instructions for carrying out operations of the present application can be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate array (FPGA), or programmable logic array (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present application.

[0151] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0152] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0153] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0154] The flow diagrams and the block diagrams in the drawings are presented to illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flow diagrams and the block diagrams can represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logic functions. In some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks can sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and / or flow diagrams, and combinations thereof, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and

[0155] While certain embodiments of the application have been described in detail as set forth above, modifications thereof can be made by one of ordinary skill in the art without departing from the scope and spirit of the application. Accordingly, it is intended that all future changes only lie within the scope of the appended claims.

Claims

1. A method for detecting a hydraulic circuit of a hydraulic brake system, characterized in that: include: Close the piston pump valve to place the motor piston pump in the first closed space; The motor piston pump is used to build up pressure in the first enclosed space. When the stroke of the motor piston pump reaches a first stroke A, the pressure in the first enclosed space is a first pressure. When the pressure of the first enclosed space is maintained at the first pressure and the first time A has passed, the stroke of the motor piston pump reaches the second stroke A; Opening the piston pump valve, maintaining the pressure of the first enclosed space at the first pressure and operating the motor piston pump, when the motor piston pump operates for the second time A, the stroke of the motor piston pump reaches a third stroke A; When the difference between the third stroke A and the second stroke A is less than or equal to the set threshold A, the detection parameter of the first enclosed space in the hydraulic circuit of the hydraulic brake system is qualified.

2. The hydraulic brake system fluid circuit detection method according to claim 1, characterized in that: The motor piston pump has a calibrated stroke A; When the difference between the third stroke A and the second stroke A is less than or equal to the set threshold A and the first stroke A is less than or equal to the calibrated stroke A, the detection parameters of the first enclosed space in the hydraulic circuit of the hydraulic brake system are qualified.

3. The hydraulic brake system fluid circuit detection method according to claim 2, characterized in that: When the difference between the third stroke A and the second stroke A is less than or equal to the set threshold A, and the first stroke A is greater than the calibrated stroke A, the air content in the first enclosed space in the hydraulic brake system fluid circuit is greater than the set value A.

4. The hydraulic brake system fluid circuit detection method according to claim 1, characterized in that: Also includes: Open the piston pump valve and the wheel cylinder liquid inlet valve, and close the master cylinder valve and the wheel cylinder liquid outlet valve, so that the motor piston pump and the wheel cylinder are both in the second closed space; The second enclosed space is pressurized by the motor piston pump. When the stroke of the motor piston pump reaches the first stroke B, the pressure of the second enclosed space is the second pressure; When the pressure of the second enclosed space is maintained at the second pressure and the first time B has passed, the stroke of the motor piston pump reaches the second stroke B; Opening the piston pump valve, maintaining the pressure of the second enclosed space at the second pressure and operating the motor piston pump, when the motor piston pump operates for the second time B, the stroke of the motor piston pump reaches a third stroke B; When the difference between the third stroke B and the second stroke B is less than or equal to a set threshold value B, the detection parameter of the second enclosed space in the hydraulic circuit of the hydraulic brake system is qualified.

5. The hydraulic brake system fluid circuit detection method according to claim 1, characterized in that: The motor piston pump has a low-position calibration stroke and a high-position calibration stroke, and the hydraulic brake system fluid circuit detection method further includes: Open the piston pump valve, master cylinder valve, and wheel cylinder inlet valve, and close the simulator valve, test valve, and wheel cylinder outlet valve, so that the motor piston pump, wheel cylinder, and brake master cylinder are all in the third closed space; The motor piston pump is used to build up pressure in the third enclosed space. When the stroke of the motor piston pump reaches the first stroke C, the pressure in the third enclosed space is a third pressure. When the first stroke C is between the low-position calibration stroke and the high-position calibration stroke, the detection parameters of the third enclosed space in the hydraulic circuit of the hydraulic brake system are qualified.

6. The hydraulic brake system fluid circuit detection method according to claim 5, characterized in that: When the first stroke C is less than the low-position calibrated stroke, at least one of the piston pump valve, the master cylinder valve, and the wheel cylinder inlet valve fails to open.

7. The hydraulic brake system fluid circuit detection method according to claim 1, characterized in that: The motor piston pump has a calibrated stroke D, and the hydraulic brake system fluid circuit detection method further includes: Open the piston pump master cylinder valve, wheel cylinder liquid inlet valve and simulator valve, and close the detection valve and wheel cylinder liquid outlet valve to place the motor piston pump, wheel cylinder, brake master cylinder and simulator in the fourth confined space; The motor piston pump is used to build up pressure in the fourth enclosed space. When the stroke of the motor piston pump reaches the first stroke D, the pressure in the fourth enclosed space is a fourth pressure. When the fourth closed space is kept sealed and the first time D has passed, the stroke of the motor piston pump reaches the second stroke D, and the pressure of the brake master cylinder reaches the fourth pressure D1; When the fourth enclosed space is kept sealed and the second time D has passed, the stroke of the motor piston pump reaches the third stroke D, and the pressure of the brake master cylinder reaches the fourth pressure D2; When the first stroke D is less than or equal to the calibrated stroke D, the difference between the third stroke D and the second stroke D is less than or equal to the set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to the set pressure D, the detection parameters of the fourth confined space in the hydraulic brake system fluid circuit are qualified.

8. The hydraulic brake system fluid circuit detection method according to claim 7, characterized in that: When the first stroke D is greater than the calibrated stroke D, the difference between the third stroke D and the second stroke D is less than or equal to the set threshold D, and the difference between the fourth pressure D2 and the fourth pressure D1 is less than or equal to the set pressure D, the air content in the fourth confined space in the hydraulic brake system fluid circuit is greater than the set value D.

9. The hydraulic brake system fluid circuit detection method according to claim 1, characterized in that: The pedal includes a low pedal stroke and a high pedal stroke, and the hydraulic brake system fluid circuit detection method further includes: Close the master cylinder valve and the simulator valve to place the brake master cylinder in the fifth closed space; The pressure of the fifth enclosed space is built up by the pedal. When the stroke of the pedal reaches the first stroke E, the pressure of the fifth enclosed space is the fifth pressure; When the first stroke E is between the low pedal stroke and the high pedal stroke, the detection parameters of the fifth enclosed space in the hydraulic circuit of the hydraulic brake system are qualified.

10. The hydraulic brake system fluid circuit detection method according to any one of claims 1 to 9, characterized in that: The detection parameters of the hydraulic brake system fluid circuit include the sealing performance of the hydraulic brake system fluid circuit and the air content of the hydraulic brake system fluid circuit.

11. A hydraulic brake system fluid circuit detection device (101), used for fluid circuit detection of a hydraulic brake system (100), characterized in that: include: A control unit (300), the control unit (300) is used to control the opening and closing of the piston pump valve (209) and the start and stop of the motor piston pump (211); a first stroke detection unit (213), the first stroke detection unit being used to detect the stroke of the motor piston pump; a first pressure detection unit (210), the first pressure detection unit being used to detect the pressure of the first enclosed space; When the first stroke detection unit (213) detects that the stroke of the motor piston pump reaches a first stroke A, the first pressure detection unit (210) detects that the pressure of the first enclosed space is a first pressure; When the pressure of the first enclosed space is maintained at the first pressure and a first time A has passed, the first stroke detection unit (213) detects that the stroke of the motor piston pump reaches a second stroke A; The pressure of the first enclosed space is maintained at the first pressure and the motor piston pump is operated. When the motor piston pump is operated for a second time A, the first stroke detection unit (213) detects that the stroke of the motor piston pump reaches a third stroke A; When the difference between the third stroke A and the second stroke A is less than or equal to the set threshold A, the detection parameter of the first enclosed space in the hydraulic circuit of the hydraulic brake system is qualified.

12. A vehicle, characterized in that: The vehicle includes the hydraulic brake system fluid circuit detection device according to claim 11.

13. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the hydraulic brake system fluid circuit detection method according to any one of claims 1 to 10 is implemented.

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