Friction plate thickness monitoring method and device, storage medium and vehicle

Abstract

The invention discloses a friction plate thickness monitoring method and device, a storage medium and a vehicle. The method comprises the steps that the initial thickness of a friction plate is obtained; under the condition that a parking instruction of the vehicle is received, a third distance, a historical cumulative first distance, a historical cumulative second distance and a historical cumulative third distance are obtained, the first distance is the distance between the contact position of the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the parking release position, and the third distance is the distance between the friction plate and the brake disc; the third distance is the distance between the release parking position and the contact position of the friction plate and the brake disc; and determining the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. According to the monitoring method, monitoring of the thickness of the friction plate can be achieved, additional hardware does not need to be added, cost is low, and errors are small.

Description

Technical Field

[0001] The present invention relates to the technical field of friction plates, and in particular to a method for monitoring the thickness of a friction plate, a computer-readable storage medium, a vehicle and a device for monitoring the thickness of a friction plate. Background Art

[0002] At present, mechanical or electronic wear alarms are usually placed in the friction plate. When the friction plate is worn to a certain extent, the alarm is triggered by mechanical noise or short circuit of electronic components, which increases the cost and cannot provide feedback on the wear degree of the friction plate. Alternatively, the wear degree is calculated by simulating the braking intensity. This indirect measurement method has a large error because it is calculated by other parameters and the wear degree of the friction plate is different under different use conditions. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a friction plate thickness monitoring method, obtain the initial thickness of the friction plate, and when receiving the parking command of the vehicle, obtain the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, wherein the first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc, and the thickness of the friction plate is determined based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, thereby realizing the monitoring of the thickness of the friction plate, without the need for additional hardware, with low cost and small error.

[0004] A second object of the present invention is to provide a computer-readable storage medium.

[0005] A third object of the present invention is to provide a vehicle.

[0006] A fourth object of the present invention is to provide a friction plate thickness monitoring device.

[0007] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a method for monitoring the thickness of a friction plate, the method comprising: obtaining the initial thickness of the friction plate; upon receiving a parking command of the vehicle, obtaining a third distance, a historically accumulated first distance, a historically accumulated second distance and a historically accumulated third distance, wherein the first distance is the distance from the contact position between the friction plate and the brake disc to the parking position, the second distance is the distance from the parking position to the released parking position, and the third distance is the distance from the released parking position to the contact position between the friction plate and the brake disc; determining the thickness of the friction plate based on the initial thickness, the third distance, the historically accumulated first distance, the historically accumulated second distance and the historically accumulated third distance.

[0008] According to the friction plate thickness monitoring method of the embodiment of the present invention, the initial thickness of the friction plate is obtained, and when the parking instruction of the vehicle is received, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance are obtained, wherein the first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc, and the thickness of the friction plate is determined based on the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. Therefore, the method can realize the monitoring of the thickness of the friction plate without the need for additional hardware, with low cost and small error.

[0009] In addition, the friction plate thickness monitoring method according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, the thickness of the friction plate is determined based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, including: obtaining the sum of the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance; and determining the thickness of the friction plate according to the difference between the initial thickness and the sum of the distances.

[0011] According to one embodiment of the present invention, obtaining the first distance includes: obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the first distance based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0012] According to one embodiment of the present invention, obtaining the second distance includes: obtaining the reversal time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the second distance based on the product of the reversal time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0013] According to one embodiment of the present invention, obtaining the third distance includes: obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the third distance based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0014] According to one embodiment of the present invention, the method further includes: controlling the push rod to move toward the brake disc; and determining the current position as the contact position between the friction plate and the brake disc when the current of the drive motor is greater than or equal to a preset current threshold.

[0015] According to an embodiment of the present invention, the method further comprises: determining a remaining thickness percentage according to the thickness of the friction plate and the initial thickness; and determining a degree of wear of the friction plate according to the remaining thickness percentage.

[0016] To achieve the above-mentioned purpose, a second embodiment of the present invention proposes a computer-readable storage medium having a program stored thereon, which implements the above-mentioned friction plate thickness monitoring method when executed by a processor.

[0017] According to the computer-readable storage medium of the embodiment of the present invention, by implementing the above-mentioned friction plate thickness monitoring method during execution, the friction plate thickness can be monitored without the need for additional hardware, with low cost and small error.

[0018] To achieve the above-mentioned purpose, a vehicle is proposed in an embodiment of the third aspect of the present invention, comprising a memory, a processor and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the above-mentioned friction plate thickness monitoring method is implemented.

[0019] According to the vehicle of the embodiment of the present invention, by executing the above-mentioned friction plate thickness monitoring method, the friction plate thickness can be monitored without the need for additional hardware, with low cost and small error.

[0020] To achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention proposes a friction plate thickness monitoring device, the device comprising: a first acquisition module, used to obtain the initial thickness of the friction plate; a second acquisition module, used to obtain a third distance, a historical cumulative first distance, a historical cumulative second distance and a historical cumulative third distance when receiving a parking command of the vehicle, wherein the first distance is the distance between the contact position between the friction plate and the brake disc to the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc; a determination module, used to determine the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance.

[0021] According to the friction plate thickness monitoring device of the embodiment of the present invention, the first acquisition module is used to acquire the initial thickness of the friction plate, and the second acquisition module is used to acquire the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance when receiving the parking instruction of the vehicle, wherein the first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc, and the determination module is used to determine the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. Thus, the device can realize the monitoring of the thickness of the friction plate without the need for additional hardware, with low cost and small error.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of a friction plate thickness monitoring method according to an embodiment of the present invention;

[0024] Figure 2 is a structural diagram of a parking device according to an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of a calculation process of the wear of the friction plate of a vehicle when the vehicle is parked according to an embodiment of the present invention;

[0026] Figure 4 A flowchart of a friction plate thickness monitoring method according to a specific example of the present invention;

[0027] Figure 5 is a block diagram of a vehicle according to an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of a block diagram of a friction plate thickness monitoring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following describes a friction plate thickness monitoring method, a computer-readable storage medium, a vehicle, and a friction plate thickness monitoring device according to embodiments of the present invention with reference to the accompanying drawings.

[0031] Figure 1 The figure is a flow chart of a friction plate thickness monitoring method according to an embodiment of the present invention.

[0032] like Figure 1 As shown, the friction plate thickness monitoring method according to the embodiment of the present invention may include the following steps:

[0033] S1, obtain the initial thickness of the friction plate.

[0034] S2, when receiving the parking command of the vehicle, obtain the third distance, the historical accumulated first distance, the historical accumulated second distance and the historical accumulated third distance, wherein the first distance is the distance between the contact position between the friction plate and the brake disc to the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position to the contact position between the friction plate and the brake disc.

[0035] S3, determining the thickness of the friction plate based on the initial thickness, the third distance, the historical accumulated first distance, the historical accumulated second distance, and the historical accumulated third distance.

[0036] Specifically, the initial thickness of the friction plate refers to the thickness of the friction plate in a new state, which can be measured when the friction plate is installed or replaced. After the friction plate is installed, the initial thickness can be recorded to calculate the remaining thickness of the friction plate after use. When receiving a parking command from the vehicle, the drive motor can push the push rod, the push rod pushes the piston, and the piston pushes the friction plate to clamp the brake disc to complete parking. For example, when the driver pulls or presses the electronic handbrake button, this operation can be recognized as a parking command, and when the parking command is received, the vehicle is parked.

[0037] When a parking instruction of the vehicle is received, the third distance, the historical accumulated first distance, the historical accumulated second distance and the historical accumulated third distance can be obtained. The first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, wherein the parking position is the position where the friction plate contacts the brake disc and applies sufficient clamping force to fix the vehicle. That is, the first distance actually reflects the distance that the push rod needs to move due to the wear of the friction plate during the parking process of the vehicle, so that the friction plate contacts the brake disc and achieves sufficient clamping force. For example, a force sensor can be installed on the push rod to indirectly estimate the first distance by measuring the clamping force applied by the friction plate to the brake disc. As the friction plate wears, the push rod needs to move a longer distance to reach the same parking position, that is, due to the reduction in the effective thickness of the friction plate, more push rod stroke is required to compensate. By monitoring this change, the wear degree of the friction plate can be evaluated.

[0038] When the driver operates the electronic handbrake button to release the parking state, that is, when the vehicle changes from the parking state to the released parking state, the push rod will move from the position where it was last parked in the direction away from the brake disc, that is, the drive motor can pull the push rod to make the friction plate leave the brake disc, thereby releasing the parking brake. The distance moved is called the second distance, that is, the second distance is the distance between the parking position and the released parking position. The second distance actually reflects the distance that the push rod needs to move due to the wear of the friction plate during the release parking process, so that the friction plate can completely leave the brake disc.

[0039] If the parking function needs to be used again, after the driver operates the electronic handbrake button to release the parking, the motor can push the push rod to make the friction plate continue to move and approach the brake disc until the friction plate contacts the brake disc, preparing for the next parking. The distance between the parking release position and the contact position of the friction plate and the brake disc is the third distance. The third distance reflects the distance that the push rod needs to move due to the wear of the friction plate in the process of preparing for the next parking, so that the friction plate contacts the brake disc and is ready to clamp. As the friction plate wears, this distance will gradually increase. Because the friction plate becomes thinner, the push rod needs to move a longer distance to make the friction plate contact the brake disc.

[0040] Each time the vehicle is parked or released, the first distance, the second distance and the third distance are obtained, so that the historical cumulative first distance can be obtained according to the first distance, the historical cumulative second distance can be obtained according to the second distance, and the historical cumulative third distance can be obtained according to the third distance. Among them, the historical cumulative first distance refers to the sum of multiple first distances, that is, the cumulative value of the distance between the contact position between the friction plate and the brake disc and the parking position, indicating the total movement distance of the push rod from the contact position to the parking position in multiple parking operations. The historical cumulative second distance refers to the sum of multiple second distances, that is, the cumulative value of the distance between the parking position and the release position, indicating the total movement distance of the push rod from the parking position to the release position in multiple parking release operations. The historical cumulative third distance refers to the sum of multiple third distances, that is, the cumulative value of the distance from the release position to the contact position between the friction plate and the brake disc, indicating the total movement distance of the push rod from the release position to the contact position in multiple parking operations. By accumulating these data, it is used to calculate the wear of the friction plate.

[0041] Therefore, after obtaining the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, the thickness of the friction plate can be determined according to the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. For example, a wear model is established, and the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance are input as variables. The wear model will calculate the expected thickness of the friction plate according to a physical or empirical formula. In this way, the monitoring of the thickness of the friction plate can be realized without the need for additional hardware, with low cost and small error.

[0042] Further, according to one embodiment of the present invention, the thickness of the friction plate is determined based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, including: obtaining the sum of the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance; and determining the thickness of the friction plate according to the difference between the initial thickness and the sum of the distances.

[0043] Specifically, when determining the thickness of the friction plate according to the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance can be added together to obtain the total moving distance (distance sum), which reflects the total distance that the push rod has moved due to the wear of the friction plate since the friction plate was in a brand new state. After determining the distance sum, the current thickness of the friction plate can be determined by subtracting the distance sum from the initial thickness. That is, since the wear of the friction plate causes the push rod to move a longer distance to achieve the same clamping force, the distance sum actually reflects the wear amount of the friction plate. For example, the relationship between the distance sum and the wear thickness of the friction plate is predetermined, such as the wear thickness of the friction plate is regarded as the same as the distance sum, so that after the distance sum is determined, the wear thickness of the friction plate can be obtained by directly calling the corresponding relationship, so that the current thickness of the friction plate can be determined according to the difference between the initial thickness and the distance sum (the wear thickness of the friction plate).

[0044] According to one embodiment of the present invention, obtaining the first distance includes: obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the first distance based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0045] Specifically, when determining the distance (first distance) between the contact position between the friction plate and the brake disc and the parking position, the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle can be obtained. Among them, the forward rotation time of the motor refers to the length of time the drive motor rotates in the forward direction (i.e., pushing the push rod toward the brake disc), which can be measured by the timer in the motor control unit, the motor speed refers to the number of revolutions of the motor per minute, which can be measured by the speed sensor built into the drive motor, and the displacement of the push rod when the drive motor rotates one circle refers to the distance the push rod moves for each revolution of the drive motor, usually in millimeters (mm). This displacement is a fixed parameter determined during system design and can be obtained through mechanical design calculations or experimental measurements.

[0046] When the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle are obtained, the current braking distance can be determined according to the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle. For example, assuming that the forward rotation time is t seconds, the motor speed is n revolutions per minute, the displacement per revolution is B millimeters per revolution, and the braking distance calculated when the motor rotates forward can be specified as a positive number, the motor speed can first be converted into a speed per second: n'=n / 60 (revolutions per second), and then the first distance is calculated, that is, the first distance=t×n'×B.

[0047] According to one embodiment of the present invention, obtaining the second distance includes: obtaining the reversal time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the second distance based on the product of the reversal time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0048] Specifically, when obtaining the distance (second distance) between the parking position and the released parking position, the reversal time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle can be obtained first. Among them, the reversal time refers to the length of time the drive motor rotates in the opposite direction (i.e., pushing the push rod away from the brake disc). This time can be measured by the timer in the motor control unit, the motor speed refers to the number of revolutions of the motor per minute, which can be measured by the speed sensor built into the drive motor, and the displacement of the push rod when the drive motor rotates one circle refers to the distance the push rod moves for each revolution of the drive motor, usually in millimeters (mm). The displacement is a fixed parameter determined during system design and can be obtained through mechanical design calculations or experimental measurements.

[0049] When the reversal time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle are obtained, the release distance can be determined according to the product of the reversal time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle. For example, assuming that the reversal time is t1 seconds, the motor speed is n revolutions per minute, the displacement per revolution is B millimeters per revolution, and it can be stipulated that the braking distance calculated when the motor is reversed is a negative number, representing the direction of movement away from the brake disc, the motor speed can first be converted into the speed per second: n'=n / 60 (revolutions per second), and then the second distance is calculated, that is, the second distance is the opposite of t1×n'×B.

[0050] According to one embodiment of the present invention, obtaining the third distance includes: obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; and determining the third distance based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

[0051] Specifically, when determining the distance (third distance) between the release parking position and the contact position between the friction plate and the brake disc, the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle can be obtained. Among them, the forward rotation time of the motor refers to the length of time the drive motor rotates in the forward direction (i.e., pushing the push rod toward the brake disc), which can be measured by the timer in the motor control unit, the motor speed refers to the number of revolutions of the motor per minute, which can be measured by the speed sensor built into the drive motor, and the displacement of the push rod when the drive motor rotates one circle refers to the distance the push rod moves for each revolution of the drive motor, usually in millimeters (mm), and the displacement is a fixed parameter determined during system design, which can be obtained through mechanical design calculations or experimental measurements.

[0052] When the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle are obtained, the current braking distance can be determined according to the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle. For example, assuming that the forward rotation time is t seconds, the motor speed is n revolutions per minute, the displacement per revolution is B millimeters per revolution, and the braking distance calculated when the motor rotates forward can be specified as a positive number, the motor speed can first be converted into a speed per second: n'=n / 60 (revolutions per second), and then the third distance is calculated, that is, the third distance=t×n'×B.

[0053] According to an embodiment of the present invention, the friction plate thickness monitoring method further includes: controlling the push rod to move toward the brake disc; and determining the current position as the contact position between the friction plate and the brake disc when the current of the driving motor is greater than or equal to a preset current threshold. The preset current threshold can be determined according to actual conditions.

[0054] Specifically, when it is determined that the current position is at the contact position between the friction plate and the brake disc, the push rod movement instruction can be used to control the push rod to move toward the brake disc, that is, when the drive motor starts and pushes the push rod, the push rod will push the piston, thereby pushing the friction plate toward the brake disc. The current of the drive motor is proportional to the force it generates. The greater the current of the drive motor, the greater the force generated, and thus the greater the displacement of the push rod. When the friction plate begins to contact the brake disc, the required force will increase because friction begins to be generated between the friction plate and the brake disc. At the moment when the friction plate contacts the brake disc, due to the increase in friction, the drive motor needs to provide a greater force to continue to push the push rod, which will cause a short increase in the current of the drive motor, that is, the current of the drive motor is greater than or equal to the preset current threshold, indicating that the friction plate is in contact with the brake disc. Therefore, by monitoring the current of the drive motor, this short increase in current can be captured, thereby identifying the moment when the friction plate contacts the brake disc, and the current position can be determined to be the contact position between the friction plate and the brake disc.

[0055] According to an embodiment of the present invention, the friction plate thickness monitoring method further includes: determining a remaining thickness percentage according to the thickness and initial thickness of the friction plate; and determining a degree of wear of the friction plate according to the remaining thickness percentage.

[0056] Specifically, after determining the thickness of the friction plate, the remaining thickness percentage can be determined based on the thickness of the friction plate and the initial thickness. For example, it can be calculated by the formula remaining thickness percentage = thickness of the friction plate / initial thickness * 100%. Therefore, after determining the remaining thickness percentage, the wear degree of the friction plate can be judged based on the remaining thickness percentage. For example, if the remaining thickness percentage is lower than a certain threshold (e.g., 80%), the friction plate may need to be replaced. That is, the wear of the friction plate can be monitored in real time, thereby improving the safety of the vehicle and providing accurate data support for repair and maintenance.

[0057] In summary, as a specific example, refer to Figure 2 and 3 As shown, assuming that the initial thickness of the friction plate T0 is 10mm, and the thickness of the friction plate after wear is Tn, when the initialization is completed, the friction plate and the brake disc are just combined, that is, A0 represents the current position of the push rod, and the friction plate and the brake disc are just in contact at this time. An represents the push rod position after the friction plate is worn, which is also determined when the friction plate and the brake disc are just in contact. During initialization, the wear thickness of the friction plate is considered to be 0, that is, the third distance, the historical cumulative first distance, the historical cumulative second distance, and the historical cumulative third distance are all 0. When the drive motor continues to push in the clamping direction, the first distance is determined to be 0.5mm by the product of the forward rotation time of the drive motor, the motor speed and the displacement of the push rod when the drive motor rotates one circle. At this time, parking is completed, that is, A1 represents the parking position at this time, and A0 to A1 is the distance between the contact position between the friction plate and the brake disc and the parking position (the first distance S1); when the driver releases the parking, the motor pushes in the releasing direction, and the second distance is determined to be -1mm by the product of the reverse rotation time, the motor speed and the displacement of the push rod when the drive motor rotates one circle. That is, A2 represents the released parking position at this time, and A1 to A2 is the distance between the parking position and the released parking position (the second distance S2).

[0058] When the parking instruction of the vehicle is received for the first time, the driving motor pushes in the clamping direction. The third distance S3 is determined to be 2mm by the product of the forward rotation time of the driving motor, the motor speed and the displacement of the push rod when the driving motor rotates one circle. That is, A3 represents the contact position between the friction plate and the brake disc. In the actual parking process, the position where the friction plate contacts the brake disc and applies sufficient clamping force to fix the vehicle is A4 (such as the distance S4 between the contact position of the friction plate and the brake disc to the parking position is 0.6mm). The historical accumulated third distance is currently 0, the historical first distance is the first distance S1, and the historical second distance is the second distance S2, so that the sum of the third distance, the historical accumulated first distance, the historical accumulated second distance and the historical accumulated third distance can be obtained as 2mm+0.5mm-1mm+0mm=1.5mm. Therefore, the thickness of the friction plate can be determined according to the difference between the initial thickness and the distance sum, that is, the thickness Tn of the friction plate is 8.5mm (10mm-1.5mm), that is, the current thickness of the friction plate. Therefore, the remaining thickness percentage can be determined according to the current thickness and the initial thickness of the friction plate, that is, the remaining thickness percentage is 85% (8.5 mm / 10 mm*100%).

[0059] When the driver releases the parking brake, the motor pushes in the release direction. The second distance is -3mm, which is determined by the product of the reversal time, the motor speed and the displacement of the push rod when the driving motor rotates one circle. That is, A4 represents the released parking position at this time, and A4 to A5 is the second distance (S5 is -3mm).

[0060] When the parking command of the vehicle is received for the second time, the driving motor continues to push in the clamping direction, and the distance (third distance) between the released parking position A5 and the contact position A6 of the friction plate and the brake disc is determined by the product of the forward rotation time of the driving motor, the motor speed and the displacement of the push rod when the driving motor rotates one circle. For example, the calculated third distance S6 is 3.5 mm. In the actual parking process, the position where the friction plate contacts the brake disc and applies sufficient clamping force to fix the vehicle is A7 (not shown in the figure).

[0061] Thus, the sum of the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance can be obtained. Among them, the third distance S6 is 3.5mm, the historical cumulative first distance is the sum of the two first distances: S1+S4=0.5mm+0.6mm, the historical cumulative second distance is the sum of the two second distances: S2+S5=-1mm-3mm, the historical cumulative third distance is S3 is 2mm, the third distance S6 this time is 3.5mm, and the distance sum is S1+S2+S3+S4+S5+S6=0.5mm-1mm+2mm+0.6mm-3mm+3.5mm=2.6mm.

[0062] Therefore, the thickness of the friction plate can be determined based on the difference between the initial thickness and the distance, that is, the thickness Tn of the friction plate is 7.4mm (10mm-2.6mm), that is, the current thickness of the friction plate. Therefore, the remaining thickness percentage can be determined based on the current thickness and initial thickness of the friction plate, that is, the remaining thickness percentage is 74% (7.4mm / 10mm*100%). Therefore, the remaining thickness of the friction plate can be accurately monitored, the safety of vehicle use can be improved, and suggestions for vehicle maintenance can be provided to customers. Moreover, since no additional hardware investment is added, higher added value can be provided to the whole vehicle.

[0063] Combine the following Figure 4 To describe the monitoring method of the present invention.

[0064] As a specific example, the friction plate thickness monitoring method of the present invention may include the following steps:

[0065] S101, obtaining the initial thickness of the friction plate.

[0066] S102 , when a parking instruction of the vehicle is received, obtaining a third distance, a historical accumulated first distance, a historical accumulated second distance, and a historical accumulated third distance.

[0067] S103, obtaining a sum of the third distance, the historical accumulated first distance, the historical accumulated second distance, and the historical accumulated third distance.

[0068] S104, determining the thickness of the friction plate according to the difference between the initial thickness and the sum of the distances.

[0069] S105, determining the remaining thickness percentage according to the thickness and the initial thickness of the friction plate.

[0070] S106, determining the wear degree of the friction plate according to the remaining thickness percentage.

[0071] In summary, according to the friction plate thickness monitoring method of the embodiment of the present invention, the initial thickness of the friction plate is obtained, and when the parking command of the vehicle is received, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance are obtained, wherein the first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc, and the thickness of the friction plate is determined based on the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. Therefore, the method can realize the monitoring of the thickness of the friction plate without the need for additional hardware, with low cost and small error.

[0072] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0073] The computer-readable storage medium of the embodiment of the present invention stores a program, and when the program is executed by a processor, the above-mentioned friction plate thickness monitoring method is implemented.

[0074] According to the computer-readable storage medium of the embodiment of the present invention, by executing the above-mentioned friction plate thickness monitoring method, the friction plate thickness can be monitored without the need for additional hardware, with low cost and small error.

[0075] Corresponding to the above embodiment, the present invention also provides a vehicle.

[0076] like Figure 5 As shown, the vehicle 200 of the embodiment of the present invention may include: a memory 210, a processor 220, and a program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the program, the above-mentioned friction plate thickness monitoring method is implemented.

[0077] According to the vehicle of the embodiment of the present invention, by executing the above-mentioned friction plate thickness monitoring method, the friction plate thickness can be monitored without the need for additional hardware, with low cost and small error.

[0078] Corresponding to the above-mentioned embodiment, the present invention further proposes a friction plate thickness monitoring device.

[0079] like Figure 6 As shown, the friction plate thickness monitoring device 100 according to the embodiment of the present invention includes: a first acquisition module 110 , a second acquisition module 120 and a determination module 130 .

[0080] The first acquisition module 110 is used to acquire the initial thickness of the friction plate. The second acquisition module 120 is used to acquire the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance when receiving the parking command of the vehicle, wherein the first distance is the distance from the contact position between the friction plate and the brake disc to the parking position, the second distance is the distance from the parking position to the released parking position, and the third distance is the distance from the released parking position to the contact position between the friction plate and the brake disc. The determination module 130 is used to determine the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance.

[0081] According to one embodiment of the present invention, the determination module 130 determines the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance, and is specifically used to: obtain the sum of the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance; determine the thickness of the friction plate according to the difference between the initial thickness and the distance sum.

[0082] According to one embodiment of the present invention, the second acquisition module 120 acquires the first distance, specifically for: acquiring the forward rotation time of the driving motor, the motor speed and the displacement of the push rod when the driving motor rotates one circle; determining the first distance based on the product of the forward rotation time, the motor speed and the displacement of the push rod when the driving motor rotates one circle.

[0083] According to one embodiment of the present invention, the second acquisition module 120 acquires the second distance, specifically for: acquiring the reversal time of the drive motor, the motor speed and the displacement of the push rod when the drive motor rotates one circle; determining the second distance based on the product of the reversal time, the motor speed and the displacement of the push rod when the drive motor rotates one circle.

[0084] According to one embodiment of the present invention, the second acquisition module 120 acquires the third distance, which is specifically used to: acquire the forward rotation time of the drive motor, the motor speed and the displacement of the push rod when the drive motor rotates one circle; determine the third distance based on the product of the forward rotation time, the motor speed and the displacement of the push rod when the drive motor rotates one circle.

[0085] According to an embodiment of the present invention, the determination module 130 is further used to: control the push rod to move toward the brake disc; and determine the current position as the contact position between the friction plate and the brake disc when the current of the drive motor is greater than or equal to a preset current threshold.

[0086] According to an embodiment of the present invention, the determination module 130 is further used to: determine the remaining thickness percentage according to the thickness and initial thickness of the friction plate; and determine the degree of wear of the friction plate according to the remaining thickness percentage.

[0087] It should be noted that for details not disclosed in the friction plate thickness monitoring device of the embodiment of the present invention, please refer to the details disclosed in the friction plate thickness monitoring method of the embodiment of the present invention, and the details will not be repeated here.

[0088] According to the friction plate thickness monitoring device of the embodiment of the present invention, the first acquisition module is used to acquire the initial thickness of the friction plate, and the second acquisition module is used to acquire the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance when receiving the parking instruction of the vehicle, wherein the first distance is the distance between the contact position between the friction plate and the brake disc and the parking position, the second distance is the distance between the parking position and the released parking position, and the third distance is the distance between the released parking position and the contact position between the friction plate and the brake disc, and the determination module is used to determine the thickness of the friction plate based on the initial thickness, the third distance, the historical cumulative first distance, the historical cumulative second distance and the historical cumulative third distance. Thus, the device can realize the monitoring of the thickness of the friction plate without the need for additional hardware, with low cost and small error.

[0089] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0090] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0093] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A friction plate thickness monitoring method, characterized in that: The method comprises: Obtaining the initial thickness of the friction plate; In the case of receiving a parking instruction of the vehicle, acquiring a third distance, a historical accumulated first distance, a historical accumulated second distance and a historical accumulated third distance, wherein the first distance is the distance from the contact position between the friction plate and the brake disc to the parking position, the second distance is the distance from the parking position to the released parking position, and the third distance is the distance from the released parking position to the contact position between the friction plate and the brake disc; The thickness of the friction plate is determined based on the initial thickness, the third distance, the historical accumulated first distance, the historical accumulated second distance, and the historical accumulated third distance.

2. The friction plate thickness monitoring method according to claim 1, characterized in that: Determining the thickness of the friction plate based on the initial thickness, the third distance, the historical accumulated first distance, the historical accumulated second distance, and the historical accumulated third distance includes: Obtaining a sum of the third distance, the historical accumulated first distance, the historical accumulated second distance, and the historical accumulated third distance; The thickness of the friction plate is determined according to the difference between the initial thickness and the sum of the distances.

3. The friction plate thickness monitoring method according to claim 1, characterized in that: Get the first distance, including: Obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; The first distance is determined based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

4. The friction plate thickness monitoring method according to claim 1, characterized in that: Get the second distance, including: Obtaining the reversal time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; The second distance is determined based on the product of the reversal time, the motor speed, and the displacement of the push rod when the driving motor rotates one circle.

5. The friction plate thickness monitoring method according to claim 1, characterized in that: Get the third distance, including: Obtaining the forward rotation time of the drive motor, the motor speed, and the displacement of the push rod when the drive motor rotates one circle; The third distance is determined based on the product of the forward rotation time, the motor speed, and the displacement of the push rod when the drive motor rotates one circle.

6. The friction plate thickness monitoring method according to claim 1, characterized in that: The method further comprises: Controlling the push rod to move toward the brake disc; When the current of the driving motor is greater than or equal to a preset current threshold, the current position is determined to be the contact position between the friction plate and the brake disc.

7. The method for monitoring the thickness of a friction plate according to any one of claims 1 to 6, characterized in that: The method further comprises: determining a remaining thickness percentage according to the thickness of the friction plate and the initial thickness; The degree of wear of the friction plate is determined according to the remaining thickness percentage.

8. A computer-readable storage medium, characterized in that: A program is stored thereon, and when the program is executed by a processor, the friction plate thickness monitoring method according to any one of claims 1-7 is implemented.

9. A vehicle, characterized in that: include: A memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the friction plate thickness monitoring method according to any one of claims 1 to 7 is implemented.

10. A friction plate thickness monitoring device, characterized in that: The device comprises: A first acquisition module, used for acquiring the initial thickness of the friction plate; a second acquisition module, for acquiring, upon receiving a parking instruction of the vehicle, a third distance, a historical accumulated first distance, a historical accumulated second distance, and a historical accumulated third distance, wherein the first distance is a distance from a contact position between the friction plate and the brake disc to a parking position, the second distance is a distance from a parking position to a released parking position, and the third distance is a distance from the released parking position to a contact position between the friction plate and the brake disc; A determination module is used to determine the thickness of the friction plate based on the initial thickness, the third distance, the historical accumulated first distance, the historical accumulated second distance and the historical accumulated third distance.

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