Automatic exhaust method, device and equipment for brake circuit and storage medium

Abstract

The invention discloses a brake circuit automatic exhaust method, device and equipment and a storage medium. The method comprises the steps that whether gas exists in each wheel edge hydraulic brake circuit or not is judged; and when it is determined that gas exists in the wheel side hydraulic braking loop, circulating pressure building and pressure relief operation is conducted on the hydraulic braking loop to generate pulse pressure so that the gas in the wheel side hydraulic braking loop can be gathered, and the gathered gas in the hydraulic braking loop can be automatically exhausted by opening an oil return pipe valve or returning a main cylinder. Under the condition that part cost and customer use cost are not additionally increased, the brake safety of the vehicle is improved, the service life of the vehicle brake fluid is indirectly prolonged, and the vehicle use cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic electric control braking, and in particular to a brake circuit automatic exhaust method, device, equipment and storage medium. BACKGROUND

[0002] During the use of the hydraulic brake system of the automobile, the brake fluid will cause the boiling point to decrease due to the absorption of water vapor in the air, and in a high-temperature environment, the water is easy to vaporize, and air bubbles are formed in the hydraulic brake circuit. Due to the compressibility of the gas, the presence of the gas will cause the pedal stroke to be too long, the foot feeling to be soft, the brake response to be slow, and other problems, which seriously endangers the driving safety.

[0003] At present, the conventional solutions to the above problems mainly exist in two kinds: one is to rely on the electric control unit of the hydraulic brake system to monitor the pressure-volume (PV) data of the circuit every time the brake is applied. If the deviation from the calibrated value is too large (for example, more than 30%), it is determined that the system is abnormal and the user is reminded to carry out after-sales maintenance. However, this method can only realize fault alarm and cannot actively solve the problem, and the user still needs to go to the maintenance point for processing. The second is to suggest the vehicle owner to replace the brake fluid based on fixed time or mileage interval (such as 3 years or 50,000 kilometers), which is a preventive maintenance strategy, but it lacks pertinence and cannot respond to the actual water content increase and air mixing of the brake fluid in real time, which may cause over-maintenance or delayed maintenance.

[0004] Therefore, how to automatically remove the air in the brake circuit is a technical problem that needs to be solved at present. SUMMARY

[0005] The main purpose of the present application is to provide a brake circuit automatic exhaust method, device, equipment and storage medium, which can improve the brake safety of the vehicle without additional cost of parts and cost of customer use, and indirectly prolong the service life of the brake fluid of the vehicle and save the cost of using the vehicle.

[0006] In a first aspect, the present application provides a brake circuit automatic exhaust method, wherein the method comprises the steps of: determining whether there is gas in each wheel edge hydraulic brake circuit; when it is determined that there is gas in the wheel edge hydraulic brake circuit, performing a cycle pressure building and pressure relief operation on the hydraulic brake circuit to generate a pulse pressure to cause the gas in the wheel edge hydraulic brake circuit to converge; automatically removing the converged gas in the hydraulic brake circuit by opening the oil return pipe valve or the master cylinder return.

[0007] In combination with the first aspect, as an optional implementation manner, after the gas in the wheel edge hydraulic brake circuit is built to the first set pressure and maintained for a set time, the first set pressure and the second set pressure are cyclically built and released based on a set frequency to generate a pulse pressure, where the first set pressure is greater than the second set pressure.

[0008] In combination with the first aspect, as an optional implementation manner, after the automatic exhaust, whether the gas still exists in the wheel edge hydraulic brake circuit is detected again. If yes, the second exhaust is continued by using the cyclic building and releasing, and after the second exhaust, whether the gas is completely exhausted is detected again. If the gas is not completely exhausted after the second exhaust, the user is informed to perform manual exhaust.

[0009] In combination with the first aspect, as an optional implementation manner, when the vehicle is vacuumized and filled with brake fluid during the vehicle assembly, each wheel edge hydraulic brake circuit is built to a preset pressure value, and the brake fluid amount required by each circuit and the corresponding pressure-volume relationship curve are recorded. During the vehicle use, when the vehicle is stationary and the electronic parking brake is enabled, the electronic control system actively builds pressure in each wheel circuit to obtain the pressure-volume relationship curve corresponding to the current brake fluid amount of each circuit. The pressure-volume relationship curve corresponding to the current brake fluid amount of each circuit is compared with the recorded brake fluid amount required by each circuit and the corresponding pressure-volume relationship curve to determine whether the gas exists in each wheel edge hydraulic brake circuit.

[0010] In combination with the first aspect, as an optional implementation manner, if the comparison between the pressure-volume relationship curve corresponding to the current brake fluid amount of each circuit and the recorded brake fluid amount required by each circuit and the corresponding pressure-volume relationship curve deviates by more than a set threshold, it is determined that the gas exists in the corresponding wheel edge hydraulic brake circuit, and a warning is issued to remind the driver.

[0011] In combination with the first aspect, as an optional implementation manner, the valve of the master cylinder or the return pipe is closed to stop the return of the brake fluid, so that the pressure in the entire hydraulic circuit is generated.

[0012] The second aspect provides a brake circuit automatic exhaust device, which comprises: A judgment module is configured to determine whether the gas exists in each wheel edge hydraulic brake circuit. A processing module is configured to, when it is determined that the gas exists in the wheel edge hydraulic brake circuit, cyclically build and release the pressure in the hydraulic brake circuit to generate a pulse pressure, so that the gas in the wheel edge hydraulic brake circuit is gathered. The execution module is used to automatically discharge the gas accumulated in the hydraulic brake circuit by opening the return oil pipe valve or retracting the master cylinder.

[0013] In combination with the above-mentioned second aspect, as an optional implementation method, the processing module is also used to, after the pressure in the gas wheel-side hydraulic brake circuit is built up to a first set pressure and maintained for a set time, perform a cyclic pressure building and pressure relief operation between the first set pressure and the second set pressure based on a set frequency to generate a pulse pressure, wherein the first set pressure is greater than the second set pressure.

[0014] In conjunction with the second aspect above, as an optional implementation, the processing module is further configured to detect again whether gas still exists in the wheel-side hydraulic brake circuit after the automatic exhaust; If yes, continue to use the cyclic pressure build-up-pressure relief method to perform the second exhaust, and after the second exhaust, check again to see if the gas is completely exhausted; If the air is still not completely exhausted after the second exhaust, the user will be notified to perform artificial exhaust.

[0015] In conjunction with the second aspect above, as an optional implementation, the judgment module is further configured to, when vacuuming and adding brake fluid during vehicle assembly, build up pressure in each wheel-side hydraulic brake circuit to a preset pressure value, and record the amount of brake fluid required for each circuit and the corresponding pressure-volume relationship curve; During vehicle use, when the vehicle is stationary and the electronic parking brake is engaged, the electronic control system actively builds pressure in each wheel-end circuit to obtain the pressure-volume relationship curve corresponding to the current brake fluid volume in each circuit; Compare the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit with the recorded brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve to determine whether there is gas in each wheel-side hydraulic brake circuit.

[0016] In combination with the above-mentioned second aspect, as an optional implementation method, the judgment module is also used to judge that there is gas in the corresponding wheel-side hydraulic brake circuit and issue a warning to alert the driver if the deviation between the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit and the recorded brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve exceeds a set threshold.

[0017] In combination with the second aspect above, as an optional implementation method, the execution module is further used to close the valve of the master cylinder or the return oil pipe to prevent the brake fluid from flowing back, so as to generate pressure in the entire hydraulic circuit.

[0018] In a third aspect, the present application provides a vehicle, characterized in that it includes the automatic exhaust device for the brake circuit provided in the second aspect above.

[0019] In a fourth aspect, the present application provides an electronic device, comprising: a processor; a memory, wherein the memory stores computer readable instructions, and the computer readable instructions, when executed by the processor, implement the method of any one of the first aspect.

[0020] In a fifth aspect, the present application provides a computer readable storage medium, which stores computer program instructions, and the computer program instructions, when executed by a computer, cause the computer to perform the method of any one of the first aspect.

[0021] The present application provides a brake circuit automatic exhaust method, device, equipment and storage medium, wherein the method comprises the steps of: judging whether there is gas in each wheel edge hydraulic brake circuit; when it is determined that there is gas in the wheel edge hydraulic brake circuit, performing cycle pressure building and pressure relief operation in the hydraulic brake circuit to generate pulse pressure to make the gas in the wheel edge hydraulic brake circuit converge; and automatically removing the converged gas in the hydraulic brake circuit by opening the oil return valve or the master cylinder return. The present application can improve the braking safety of the vehicle without increasing the cost of parts and the use cost of customers, and indirectly prolong the service life of the vehicle brake fluid and save the use cost of the vehicle.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application, together with the description.

[0024] Figure 1 A brake circuit automatic exhaust method flow chart provided in an embodiment of the present application; Figure 2 A brake circuit automatic exhaust device schematic diagram provided in an embodiment of the present application; Figure 3 An electronic device schematic diagram provided in an embodiment of the present application; Figure 4 A computer readable program medium schematic diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0026] Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Some of the blocks shown in the drawings are functional entities that do not necessarily correspond to physically or logically separate entities.

[0027] The embodiments of the present application provide a method, device, equipment and storage medium for automatic exhaust of a brake circuit, which can improve the braking safety of a vehicle without increasing the cost of parts and customer usage costs, and indirectly extend the service life of the vehicle's brake fluid and save vehicle usage costs.

[0028] To achieve the above technical effects, the general ideas of this application are as follows: A method for automatically exhausting a brake circuit, the method comprising the steps of: S101: Determine whether there is gas in each wheel side hydraulic brake circuit.

[0029] S102: When it is determined that gas exists in the wheel-side hydraulic brake circuit, a cyclic pressure-building and pressure-relieving operation is performed in the hydraulic brake circuit to generate a pulse pressure to converge the gas in the wheel-side hydraulic brake circuit; S103: Automatically remove the gas accumulated in the hydraulic brake circuit by opening the return oil pipe valve or retracting the master cylinder.

[0030] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0031] Reference Figure 1 , Figure 1 The figure shows a flow chart of a brake circuit automatic exhaust method provided by the present invention, as shown in FIG. Figure 1 As shown, the method includes the steps of: Step S101: Determine whether there is gas in each wheel-side hydraulic brake circuit.

[0032] Specifically, when vacuuming and adding brake fluid during vehicle assembly, each wheel-side hydraulic brake circuit is pressured to a preset value, and the amount of brake fluid required for each circuit and the corresponding pressure-volume relationship curve are recorded; During vehicle use, when the vehicle is stationary and the electronic parking brake is engaged, the electronic control system actively builds pressure in each wheel-end circuit to obtain the pressure-volume relationship curve corresponding to the current brake fluid volume in each circuit; The pressure-volume relationship curve corresponding to the current brake fluid amount of each circuit is compared with the recorded brake fluid amount required by each circuit and the corresponding pressure-volume relationship curve to determine whether there is gas in each wheel edge hydraulic brake circuit.

[0033] For the convenience of understanding and illustration, when the vehicle is being vacuum-filled during final assembly, the brake fluid amount required by the four wheel edge circuits of the vehicle when building pressure to the target pressure value at that time is recorded, and the PV curve (pressure-volume relationship) of the vehicle at that time is recorded; during the subsequent use of the vehicle, if the customer chooses to turn on this function (the vehicle is stationary and the EPB is pulled up). The electronic control system will actively build pressure in the four wheel end circuits (where the target PV is built, the relationship between the push rod formation and the pressure is recorded. The push rod stroke is generally 0-20mm, and then the pressure values at the intermediate strokes, such as 5mm, 10mm, and 15mm, are compared with the recorded pressure), check the brake fluid amount (PV curve) at that time, and compare it with the internal recorded value at the time of delivery (the recorded value refers to the vehicle at the time of delivery, which will detect the leakage of the brake system circuit, and the check process will collect the relationship curve between the push rod stroke and the hydraulic pressure, i.e. the PV curve. P refers to the pressure, and V refers to the volume), if the deviation is too large (more than 10%), if the deviation is too large, a warning is issued to remind the driver to have the vehicle repaired at an after-sales store), it is determined that there is air in the circuit, which needs to be evacuated.

[0034] It can be understood that the PV curve is recorded during the final assembly stage: during the vacuum filling and filling of the brake system on the vehicle final assembly line, the electronic control system controls the hydraulic pump to build pressure to the target pressure value 100 bar in the four wheel edge circuits (front left, front right, rear left, and rear right). The system monitors and records the brake fluid amount required by each circuit to reach 100 bar (unit: mL) in real time, and generates the PV curve (pressure-volume relationship curve) of the vehicle. The PV curve data is stored in the non-volatile memory of the vehicle ECU in an encrypted format after verification, serving as a reference for subsequent air detection.

[0035] Air detection and warning during use: When the vehicle is parked and the driver pulls up the electronic parking brake (EPB), the brake system air detection function is selected to be turned on through the central control screen. The electronic control system automatically triggers the detection process: actively building pressure in the four wheel end circuits, obtaining the PV curve corresponding to the current brake fluid amount, comparing the current PV curve with the offline PV curve stored in the ECU point by point, calculating the relative deviation of each circuit (formula: deviation = |current value - reference value| / reference value x 100%); if the deviation of any circuit exceeds 10% (such as the left rear circuit deviation reaching 12%), the system immediately displays a red warning light on the instrument panel and prompts the brake system to be repaired after sale.

[0036] Optionally, in one embodiment, the hydraulic brake system of a new off-line vehicle is tested in the assembly line of the vehicle. The system separately pumps each wheel-end hydraulic brake circuit (front left, front right, rear left, rear right) to a preset pressure value (e.g., 120 bar) while monitoring the amount of brake fluid injected. The amount of brake fluid required for each circuit (e.g., 45 ml for the front left wheel, 42 ml for the front right wheel) and the corresponding pressure-volume relationship curve (e.g., the volume changes linearly as the pressure increases from 0 bar to 120 bar) are recorded. The curve data for all circuits are stored in the database of the vehicle electronic control unit (ECU) as a reference for subsequent comparison.

[0037] When the vehicle is parked (static state), the driver activates the electronic parking brake (EPB), and the system automatically triggers brake fluid volume detection. After the vehicle is stationary and the EPB is activated, the electronic control system actively builds pressure in each wheel-end circuit (e.g., the front left wheel) without the need for driver intervention. The pressure sensor and liquid level sensor are used to obtain the real-time pressure-volume relationship curve corresponding to the current brake fluid volume (e.g., when the pressure is built to 100 bar, the measured volume is 48 ml).

[0038] The system compares the current curve (e.g., front left wheel: 100 bar corresponds to 48 ml) with the initial curve recorded during assembly (front left wheel: 100 bar corresponds to 45 ml).

[0039] After the vehicle is driven, the system automatically performs gas detection the next time it is stationary to determine whether gas has been mixed into the brake circuit. The electronic control system compares the current curve of the wheel-end circuit (e.g., rear right wheel at 80 bar with a volume of 38 ml) with the assembly-recorded curve (rear right wheel at 80 bar with a volume of 35 ml). If the current curve has a significantly larger volume at the same pressure (e.g., a volume difference of ≥10 ml), it is determined that there is gas in the circuit. The system triggers a diagnosis: a "brake system contains gas" warning is displayed on the instrument panel, and maintenance is recommended (e.g., "rear right wheel brake fluid contains gas, please check the brake pipeline").

[0040] In addition, it needs to be explained that other structures of the hydraulic circuit are sealed, and the almost all softening caused during use is because the brake fluid in the oil tank absorbs atmospheric moisture. The function of the reservoir is to balance the gas and compensate the liquid level: During the air exhaust process, a large amount of brake oil will be discharged from the system. The function of the reservoir is to continuously supplement fresh brake oil to the master cylinder (master cylinder), to prevent the master cylinder from sucking air. The operator must monitor the liquid level of the reservoir at all times and add new oil in time. It must not be empty, otherwise more air will be introduced. Pressure balance: The cover of the brake reservoir is not completely sealed. The cover is designed with a vent hole or a breathable film. Ventilation requirement: When braking, the oil is pushed to the pump, the liquid level of the reservoir decreases, and air needs to be sucked in to supplement the pressure. When the brake is released, part of the oil may flow back, the liquid level rises, and the internal pressure needs to be released. Brake oil will expand and contract with temperature changes. Vent hole / air permeable film: It is usually a labyrinth structure or a special material film that allows air to exchange between the inside and outside of the tank to balance the pressure change and prevent vacuum or overpressure. But it can also prevent water vapor and dust from entering the tank and polluting the brake fluid (brake fluid has strong water absorption, and water will lower the boiling point and affect braking performance). The left and right of the oil tank is to adjust the pressure balance to avoid negative pressure and cause the brake fluid to be unable to supplement the brake circuit. Therefore, the structure of the oil tank is not completely sealed, and the cumulative absorption of atmospheric moisture into the tank during use cannot be avoided in the existing structure, so the vehicle manual generally requires that the vehicle be replaced with brake fluid at around 50,000 kilometers.

[0041] In an embodiment, if the current brake fluid amount corresponding to the pressure-volume relationship curve of each circuit and the recorded brake fluid amount required by each circuit and the corresponding pressure-volume relationship curve are compared and the deviation exceeds a set threshold, it is determined that there is gas in the corresponding wheel edge hydraulic brake circuit, and a warning is issued to remind the driver.

[0042] Step S102: When it is determined that there is gas in the wheel edge hydraulic brake circuit, the hydraulic brake circuit is operated to circulate and build pressure and release pressure to generate pulse pressure to make the gas in the wheel edge hydraulic brake circuit converge.

[0043] Specifically, before the hydraulic brake circuit is operated to circulate and build pressure and release pressure, the valve of the master cylinder or the return pipe is closed to stop the backflow of brake fluid, so that pressure is generated in the entire hydraulic circuit. It can be understood that during vehicle driving, the electronic brake system (such as EPB or ABS) triggers the build-up operation (for example, emergency braking or parking braking).

[0044] The system detects the need to build pressure (e.g. driver steps on brake pedal or engages electronic parking), the ECU immediately closes the valve of the master cylinder or the return line. After the valve of the master cylinder or the return line is closed, the brake fluid cannot return to the reservoir or the master cylinder, and the hydraulic circuit is sealed. The brake pump continues to pressurize in the sealed circuit, and the pressure rises steadily (e.g. from 0 bar to 120 bar), forming an effective brake pressure.

[0045] After building pressure to a first set pressure and maintaining the set pressure for a set time in the presence of gas in the wheel edge hydraulic brake circuit, a cyclic pressure build-up and pressure release operation is performed between the first set pressure and a second set pressure based on a set frequency, generating a pulse pressure to cause the gas in the wheel edge hydraulic brake circuit to gather to the highest point; wherein the frequency of the pressure build-up and pressure release is set according to the length and direction of the vehicle hydraulic line, and the initial value is 0.5 HZ for fluctuating pressure build-up.

[0046] Step S103: automatically remove the gas gathered in the hydraulic brake circuit by opening the return line valve or master cylinder return.

[0047] Specifically, the pulse pressure is used to promote the migration of gas in the wheel edge hydraulic brake circuit to the highest point reservoir, and then the return line closing valve or master cylinder return is opened to automatically remove the gas to the outside of the vehicle, wherein the first set pressure is greater than the second set pressure.

[0048] In one embodiment, it is confirmed that there is gas (e.g. the rear left wheel circuit pressure-volume curve shows an abnormality). The rear left wheel edge circuit is pressurized to a first set pressure P1 (e.g. 100 bar) and maintained for a set time (e.g. 20 seconds). The pressure is cyclically built up and released between P1 (100 bar) and a second set pressure P2 (e.g. 50 bar) at a set frequency (e.g. 2 times per second) to generate a pulse pressure. Under the action of the pulse pressure, the gas (e.g. air bubbles) in the circuit is driven to the highest point reservoir (the reservoir is located at the highest point of the engine compartment). The system automatically opens the return line closing valve, and the gas is discharged to the outside of the vehicle through the return line, while the master cylinder returns to prevent the return of brake fluid. After the exhaust is completed, the return line closing valve is closed, and the system returns to normal.

[0049] Optionally, the vehicle is stationary and EPB is enabled, the system detects that there is gas in the front right wheel circuit (based on historical curve comparison). The front right wheel circuit is built up to P1 (e.g. 110 bar) and maintained for a set time (e.g. 15 seconds). The pressure is cycled between P1 (e.g. 110 bar) and P2 (e.g. 60 bar) at a set frequency (e.g. 1.5 times per second) to generate a pulsing pressure. The pulsing pressure causes the gas to migrate along the hydraulic circuit and eventually collect in the highest point reservoir. The system actively opens the return pipe shut off valve and the gas is automatically vented to the outside of the vehicle through the return pipe; at the same time, the master cylinder retraction action ensures that brake fluid does not flow back. After the gas is vented, the system closes the return pipe shut off valve and the EPB state is maintained, with no gas warning on the dashboard.

[0050] In one embodiment, after the automatic venting, the system detects whether there is still gas in the wheel edge hydraulic brake circuit; if so, the system continues to use the cycle of building pressure and releasing pressure to perform a second venting, and after the second venting, the system detects again whether the gas is completely vented; if the gas is not completely vented after the second venting, the system notifies the user to perform manual venting.

[0051] In one embodiment, the first automatic venting is performed: the rear left wheel circuit is built up to a first set pressure (P1), maintained for a set time, and then cycled between P1 and a second set pressure (P2) at a set frequency to generate a pulsing pressure, causing the gas to migrate to the highest point reservoir and be vented. After the first venting, the system compares the current pressure-volume curve with the initial baseline curve and finds that there is still gas in the rear left wheel circuit (e.g. the curve deviation is >1 ml). The second automatic venting is performed: the system automatically starts the cycle of building pressure and releasing pressure (repeating the pulsing pressure operation of step 1) to perform a second venting for the rear left wheel circuit. After the second venting, the curve is compared again to confirm that the gas is not completely vented (the deviation is still >0.5 ml). The user is notified: the system displays a warning on the diagnostic screen at the repair station that the brake circuit contains gas and has not been completely removed, and manual venting is required. It can be understood that if the first venting is not successful, a second venting will be performed. If the second venting is also not successful, it means that other methods cannot be successfully vented, and at this time the vehicle owner can be notified to go to the after-sales center for manual complete venting.

[0052] For the convenience of understanding, the method of active air exhaust is illustrated as follows: the electronic control system builds pressure (100 bar) in the circuit and maintains for a period of time (10 s), and then the electronic control system builds pressure and releases pressure (100 bar-80 bar-100 bar-80 bar) back and forth, so that the entire hydraulic brake circuit forms a pulse pressure. The purpose of this measure is to make the gas in the hydraulic circuit gradually move to the highest point under the action of pressure (for the convenience of air exhaust, the oil tank is generally designed as the highest point, and the brake master cylinder and the oil return pipe are connected. When the hydraulic electric control brake system builds pressure, the valve of the master cylinder or the oil return pipe is closed to prevent the return flow of brake fluid, so that pressure can be generated in the entire hydraulic circuit), and then the IPB opens the oil return pipe closing valve or the master cylinder return of the hydraulic circuit, so that the air in the circuit will return to the oil tank and then be discharged to the outside of the vehicle.

[0053] Optionally, in an embodiment, the electronic control system (such as ECU) starts the hydraulic brake circuit pressure building program, raises the circuit pressure to 100 bar and maintains for 10 seconds, and closes the brake master cylinder valve (V1) or the oil return pipe valve (V2) to prevent the return flow of brake fluid. After the pressure building is completed, the electronic control system controls the pressure to be periodically switched between 100 bar and 80 bar (pulse frequency: switch once every 500 ms), forming a continuous pulse pressure (100 bar→80 bar→100 bar→80 bar…), which lasts for 30 seconds. The pulse pressure makes the gas in the circuit gradually move to the oil tank (the oil tank is the highest point of the hydraulic system, connected through the brake master cylinder and the oil return pipe) under the action of pressure gradient. After the pulse pressure is completed, the IPB (integrated brake system) opens the oil return pipe valve (V2) or makes the master cylinder return, so that the gas returns to the oil tank with the brake fluid and is discharged to the outside of the vehicle through the exhaust port of the oil tank.

[0054] The initial pressure field is established by building pressure of 100 bar for 10 seconds, the pulse pressure (100 bar / 80 bar) enhances the gas migration efficiency, and avoids the gas retention caused by low pressure in the traditional air exhaust. Moreover, no parts need to be disassembled, which meets the automatic demand of mass-produced vehicles.

[0055] Optionally, in an embodiment, for the front wheel hydraulic circuit (R1): the electronic control system builds pressure to 100 bar and maintains for 10 seconds, the pulse pressure 100 bar / 80 bar (period 500 ms) lasts for 30 seconds, and the master cylinder valve (V1) or the oil return pipe closing valve (V2) is closed. For the rear wheel hydraulic circuit (R2): the electronic control system builds pressure to 90 bar and maintains for 8 seconds, and the pulse pressure 90 bar lasts for 25 seconds. The pulse pressures of the two circuits are executed synchronously, and the gas moves to the oil tank respectively. In the air exhaust stage, the IPB opens the master cylinder valve (V1) or the oil return pipe valve (V2) of R1 and R2 at the same time, so that the gas of the two circuits is discharged through the same exhaust port.

[0056] To sum up, the present application uses the method of high pressure + pulse pressure, which can largely eliminate the water vapor mixed in the hydraulic pipeline, improve the problems of soft vehicle braking and slow response of the braking system, and improve the braking safety of the vehicle. There is no need to disassemble the braking circuit. The vehicle only needs to be stationary, and the rest can be left to the electronic control system. It is convenient and fast.

[0057] This system improves vehicle braking safety without increasing parts costs or customer usage costs. By adding active exhaust during use, it indirectly extends the life of the vehicle's brake fluid, saving customers money.

[0058] Reference Figure 2 , Figure 2 The figure shows a schematic diagram of an automatic exhaust device for a brake circuit provided by the present invention, as shown in FIG. Figure 2 As shown, the device includes: Judgment module 201: It is used to judge whether there is gas in each wheel side hydraulic brake circuit.

[0059] Processing module 202 is used to, when it is determined that there is gas in the wheel-side hydraulic brake circuit, perform cyclic pressure building and pressure relief operations in the hydraulic brake circuit to generate pulse pressure to allow the gas in the wheel-side hydraulic brake circuit to converge.

[0060] The execution module is used to open the oil return pipe valve or retract the master cylinder to automatically remove the gas gathered in the hydraulic brake circuit.

[0061] Furthermore, in a possible embodiment, the processing module is also used to, after the pressure in the gas wheel-side hydraulic brake circuit is built up to a first set pressure and maintained for a set time, perform a cyclic pressure building and pressure relief operation between the first set pressure and the second set pressure based on a set frequency to generate a pulse pressure, wherein the first set pressure is greater than the second set pressure.

[0062] Furthermore, in a possible implementation manner, the processing module is further configured to detect again whether gas still exists in the wheel-side hydraulic brake circuit after the automatic exhaust; If yes, continue to use the cyclic pressure build-up-pressure relief method to perform the second exhaust, and after the second exhaust, check again to see if the gas is completely exhausted; If the air is still not completely exhausted after the second exhaust, the user will be notified to perform artificial exhaust.

[0063] Furthermore, in one possible implementation, the judgment module is further configured to build up the pressure of each wheel-side hydraulic brake circuit to a preset pressure value when vacuuming and adding brake fluid during vehicle assembly, and to record the amount of brake fluid required for each circuit and the corresponding pressure-volume relationship curve; During the use of the vehicle, when the vehicle is stationary and the electronic parking brake is enabled, the electronic control system actively builds pressure in each wheel end circuit to obtain a pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit; The pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit is compared with the recorded brake fluid volume required by each circuit and the corresponding pressure-volume relationship curve to determine whether there is gas in each wheel edge hydraulic brake circuit.

[0064] Further, in a possible implementation, the judging module is further configured to determine that there is gas in the corresponding wheel edge hydraulic brake circuit and issue a warning to remind the driver if the comparison between the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit and the recorded brake fluid volume required by each circuit and the corresponding pressure-volume relationship curve deviates by more than a set threshold.

[0065] Further, in a possible implementation, the processing module is further configured to close the valve of the master cylinder or the oil return pipe to stop the return of brake fluid, so as to generate pressure in the entire hydraulic circuit.

[0066] The electronic device 300 according to this implementation of the present application will be described below with reference to Figure 3 The electronic device 300 is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application. Figure 3 The electronic device 300 is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0067] As shown in Figure 3 The electronic device 300 is in the form of a general computing device. The components of the electronic device 300 can include but are not limited to the above-mentioned at least one processing unit 310, the above-mentioned at least one storage unit 320, and a bus 330 connecting different system components, including the storage unit 320 and the processing unit 310.

[0068] The storage unit stores program code that can be executed by the processing unit 310, so that the processing unit 310 performs the steps described in the above “Embodiment Method” section of the present specification according to various exemplary implementations of the present application.

[0069] The storage unit 320 can include a readable medium in the form of a volatile storage unit, such as a random access memory (RAM) 321 and / or a cache memory 322, and can further include a read-only memory (ROM) 323.

[0070] The storage unit 320 can also include a number of program modules 325 that are stored in the memory 324, including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or a combination of which can include implementation of a network environment.

[0071] The bus 330 can represent one or more of several types of bus structures, including a storage unit bus or bus for storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit bus, or a local bus using any of a variety of bus architectures.

[0072] The electronic device 300 can also communicate with one or more external devices such as a keyboard or a pointing device, through an I / O interface 350. Additionally, the electronic device 300 can communicate with one or more devices that enable a user to interact with the electronic device 300, and / or one or more devices that enable the electronic device 300 to communicate with one or more other computing devices. Such communication can occur via an input / output (I / O) interface 350. Still yet, the electronic device 300 can communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or the Internet) through a network adapter 360. As depicted, the network adapter 360 communicates with the other components of the electronic device 300 via the bus 330. It should be appreciated that although the network adapter 360 is depicted as a single component, the network adapter 360 can comprise two or more components that operate together to facilitate communications with one or more networks. Further, it should be appreciated that the bus 330 can be implemented using any type of communications fabric that can facilitate communication between various components of the electronic device 300.

[0073] Those skilled in the art will readily appreciate that the example embodiments described herein can be implemented by software and / or firmware in addition to the necessary hardware, and that the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product. The software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash disk, a mobile hard disk, or the like) or a network, and includes a number of instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to perform the methods according to the embodiments of the present disclosure.

[0074] According to the scheme of the present disclosure, a computer readable storage medium is also provided, on which a program product capable of implementing the above-mentioned method of the present specification is stored. In some possible implementation manners, various aspects of the present application can also be implemented in the form of a program product, which includes program codes for causing a terminal device to perform the steps according to various exemplary embodiments of the present application described in the above-mentioned “Exemplary Method” section of the present specification when the program product is run on the terminal device.

[0075] Reference Figure 4 As shown, a program product 400 for implementing the above-mentioned method according to the embodiments of the present application is described, which can adopt a portable compact disc read-only memory (CD-ROM) and include program codes, and can be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto, and in the present document, the readable storage medium can be any tangible medium containing or storing a program, which can be used by or in conjunction with an instruction execution system, apparatus or device.

[0076] The program product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium may, for example, be but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0077] The computer readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which readable program codes are borne. Such a propagated data signal can take on multiple forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The readable signal medium can also be any readable medium other than the readable storage medium, which can send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device.

[0078] The program codes contained on the readable medium can be transmitted by any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the above.

[0079] The program code may be implemented in any of various ways, including procedure-based, object-oriented approaches, Java, C++, C#, or a similar programming language. The program code can execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's computing device 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 computing device, such as through the Internet using an Internet Service Provider.

[0080] Furthermore, the above-described diagrams are only schematic and are non-limiting. It is readily understood that the processes shown in the diagrams are not necessarily performed in the order shown and / or in sequential order, as some aspects can, in fact, be performed in parallel. Likewise, other implementations of the processes disclosed herein can be realized with various changes made in accordance with this disclosure. Moreover, while various aspects can be presented below in terms of sequences, overview, or flowcharts, it should be recognized that the various sequences can be performed in other sequences without departing from the spirit or scope of the present application, as defined by the appended claims.

[0081] In summary, the application provides a brake circuit automatic exhaust method, device, equipment and storage medium, wherein the method comprises the steps of: judging whether there is gas in each wheel edge hydraulic brake circuit; when it is determined that there is gas in the wheel edge hydraulic brake circuit, performing cycle pressure building and pressure relief operation on the hydraulic brake circuit to generate pulse pressure to make the gas in the wheel edge hydraulic brake circuit converge; and automatically removing the converged gas in the hydraulic brake circuit by opening the oil return valve or the master cylinder return. The application can improve the braking safety of the vehicle without increasing the cost of parts and the use cost of customers, and indirectly prolongs the service life of the vehicle brake fluid and saves the use cost of the vehicle.

[0082] The above descriptions are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0083] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing 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 specified in the flowchart block or blocks. Figure 1 The flowchart and / or block diagram in the variation of the present application illustrate the architecture, functionality, and operation of possible implementations of apparatuses (systems), methods and computer program products according to the present application. In this regard, each flowchart block and / or block in the flowcharts and / or block diagrams can represent a module, segment, or portion of code, which comprises one or more executable Figure 1 instructions for implementing the specified logical functions. The flowchart and / or block diagram in the variation of the present application can also represent a method according to the present application. The flowchart and / or block diagram in the variation of the present application can be stored in any suitable location, memory or transmission medium irrespective of the particular technology and / or methodology for storage and / or transmission.

Claims

1. A method for automatically exhausting a brake circuit, characterized in that: include: Determine whether there is gas in each wheel side hydraulic brake circuit; When it is determined that there is gas in the wheel-side hydraulic brake circuit, a cyclic pressure-building and pressure-relieving operation is performed in the hydraulic brake circuit to generate pulse pressure to cause the gas in the wheel-side hydraulic brake circuit to converge; The gas accumulated in the hydraulic brake circuit is automatically discharged by opening the return oil pipe valve or retracting the master cylinder.

2. The method according to claim 1, characterized in that When it is determined that there is gas in the wheel-side hydraulic brake circuit, performing cyclic pressure building and pressure relief operations in the hydraulic brake circuit to generate pulse pressure includes: After the pressure in the gas wheel-side hydraulic brake circuit is built up to a first set pressure and maintained for a set time, a cyclic pressure building-pressure relief operation is performed between the first set pressure and the second set pressure based on a set frequency to generate a pulse pressure, wherein the first set pressure is greater than the second set pressure.

3. The method according to claim 2, characterized in that Also includes: After the automatic exhaust, check again whether there is still gas in the wheel side hydraulic brake circuit; If yes, continue to use the cyclic pressure build-up-pressure relief method to perform the second exhaust, and after the second exhaust, check again to see if the gas is completely exhausted; If the air is still not completely exhausted after the second exhaust, the user will be notified to perform artificial exhaust.

4. The method according to claim 1, wherein The determining whether there is gas in each wheel hydraulic brake circuit includes: When vacuuming and adding brake fluid during vehicle assembly, build up pressure in each wheel-side hydraulic brake circuit to the preset value, and record the brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve; During vehicle use, when the vehicle is stationary and the electronic parking brake is engaged, the electronic control system actively builds pressure in each wheel-end circuit to obtain the pressure-volume relationship curve corresponding to the current brake fluid volume in each circuit; Compare the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit with the recorded brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve to determine whether there is gas in each wheel-side hydraulic brake circuit.

5. The method according to claim 4, characterized in that include: If the deviation between the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit and the recorded brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve exceeds the set threshold, it is determined that there is gas in the corresponding wheel-side hydraulic brake circuit and an alarm is issued to alert the driver.

6. The method according to claim 1, characterized in that Before the hydraulic brake circuit performs cyclic pressure building and pressure relief operations, the method includes: Close the valve of the master cylinder or return oil pipe to stop the brake fluid from flowing back, so that pressure is generated in the entire hydraulic circuit.

7. A brake circuit automatic exhaust device, characterized in that: include: A judgment module, which is used to judge whether there is gas in each wheel side hydraulic brake circuit; a processing module configured to, upon determining that gas exists in the wheel-side hydraulic brake circuit, perform cyclic pressure-building and pressure-relieving operations in the hydraulic brake circuit to generate pulse pressure, thereby causing the gas in the wheel-side hydraulic brake circuit to converge; The execution module is used to automatically discharge the gas accumulated in the hydraulic brake circuit by opening the return oil pipe valve or retracting the master cylinder.

8. The device according to claim 7, characterized in that include: The processing module is also used to build up the pressure in the gas wheel-side hydraulic brake circuit to a first set pressure and maintain it for a set time, and then perform a cyclic pressure building and pressure relief operation between the first set pressure and the second set pressure based on a set frequency to generate a pulse pressure, wherein the first set pressure is greater than the second set pressure.

9. The device according to claim 7, characterized in that include: The processing module is also used to detect whether there is still gas in the wheel side hydraulic brake circuit after automatic exhaust; If yes, continue to use the cyclic pressure build-up-pressure relief method to perform the second exhaust, and after the second exhaust, check again to see if the gas is completely exhausted; If the air is still not completely exhausted after the second exhaust, the user will be notified to perform artificial exhaust.

10. The device according to claim 7, characterized in that include: The judgment module is further configured to build up the pressure of each wheel-side hydraulic brake circuit to a preset pressure value when vacuuming and adding brake fluid during vehicle assembly, and to record the amount of brake fluid required for each circuit and the corresponding pressure-volume relationship curve; During vehicle use, when the vehicle is stationary and the electronic parking brake is engaged, the electronic control system actively builds pressure in each wheel-end circuit to obtain the pressure-volume relationship curve corresponding to the current brake fluid volume in each circuit; Compare the pressure-volume relationship curve corresponding to the current brake fluid volume of each circuit with the recorded brake fluid volume required for each circuit and the corresponding pressure-volume relationship curve to determine whether there is gas in each wheel-side hydraulic brake circuit.

11. The device according to claim 10, characterized in that include: The judgment module is also used to judge that there is gas in the corresponding wheel-side hydraulic brake circuit and issue a warning to alert the driver if the deviation between the pressure-volume relationship curve corresponding to the current brake fluid amount in each circuit and the recorded brake fluid amount required for each circuit and the corresponding pressure-volume relationship curve exceeds a set threshold.

12. The device according to claim 7, characterized in that include: The execution module is also used to close the valve of the master cylinder or the oil return pipe to prevent the brake fluid from flowing back, thereby generating pressure in the entire hydraulic circuit.

13. A vehicle, characterized in that: It comprises the automatic exhaust device for the brake circuit as described in any one of claims 7 to 12.

14. An electronic device, characterized in that: The electronic device comprises: processor; A memory having computer-readable instructions stored thereon, wherein when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 6 is implemented.

15. A computer-readable storage medium, characterized in that The computer program instructions are stored therein, and when the computer program instructions are executed by a computer, the computer is caused to execute the method according to any one of claims 1 to 6.

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