Reclamping control method for electronic parking system

Abstract

The invention discloses a re-clamping control method for an electronic parking system in the technical field of automobile parking braking safety, which comprises the following steps: S1, acquiring the gradient of the position of a vehicle during parking, and mapping the clamping force N1 adopted for parking according to the corresponding relationship between the gradient and the clamping force; s2, parking operation is executed with the clamping current corresponding to the clamping force N1 as the target clamping current, in the parking operation execution process, the real-time value of the power supply voltage is obtained, and if the power supply voltage jumps, the power supply voltage is recorded as a voltage jump flag bit F1; s3, if the voltage jump flag bit F1 is true, re-clamping operation is executed after parking operation is completed; and if the voltage jump flag bit F1 is false, parking is ended after the parking operation is completed. According to the invention, the power supply voltage in the parking process is detected and monitored in real time, the step of the power supply voltage is identified in the segmented parking process, and the re-clamping operation is executed after the parking is completed, so that the parking safety of the vehicle can be improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parking brake safety technology, specifically to a re-clamping control method for electronic parking systems. Background Technology

[0002] With the continuous development of automotive technology, safety has become an important factor in the industry, and more and more electronic control systems are being installed in vehicles. Among them, the Electronic Park Brake (EPB) system has become a standard feature in more and more passenger cars.

[0003] Currently, there are two methods for controlling the parking clamping force of EPB (Electronic Parking Brake) on the market. The first method uses a constant clamping force for parking, which does not require identification of the current slope value and uses a constant high clamping force for parking under different working conditions. The second method uses a segmented parking control method, which uses a clamping force matched to the slope on which the vehicle is located. Compared with constant clamping force parking, segmented parking has advantages such as shorter action response time, lower operating noise, less mechanical life loss, and lower risk of rust adhesion.

[0004] However, in actual production activities, compared with the constant clamping force control method for parking, the risk of vehicle rollover increases exponentially when the segmented parking control method is used, which seriously affects the application of the segmented parking control method on vehicles.

[0005] In the market, the Body Control Module (BCM) or Battery Management System (BMS) of new energy vehicles continuously monitors the battery voltage and charge. When the battery charge is low, an intelligent charging strategy is activated, and the power battery charges the battery via DC-DC. Intelligent charging greatly extends the battery life and also reduces the probability of the vehicle failing to start due to battery depletion.

[0006] Therefore, how to reduce the risk of vehicles rolling back when using segmented parking control methods and improve vehicle parking safety has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a re-clamping control method for an electronic parking system, so as to reduce the risk of vehicle rollover when parking using a segmented parking control method and improve the parking safety of the vehicle.

[0008] The technical solution adopted in this invention is: a re-clamping control method for an electronic parking system, comprising:

[0009] Step S1: Obtain the slope of the vehicle's position when parking, map the target clamping force used for parking based on the correspondence between slope and clamping force, and record it as clamping force N1;

[0010] Step S2: The electronic parking system performs parking operation with the clamping current corresponding to the clamping force N1 as the target clamping current. During the parking operation, the system acquires the real-time value of the power supply voltage. If the power supply voltage jumps, it is recorded as voltage jump flag F1.

[0011] Step S3: Determine whether the voltage jump flag F1 is true. If the voltage jump flag F1 is true, perform the re-clamping operation after the parking operation is completed; if the voltage jump flag F1 is false, end the parking operation after the parking operation is completed.

[0012] Preferably, the re-clamping operation is performed by the electronic parking system with the clamping current corresponding to the clamping force N2 as the target clamping current, and N2≥N1.

[0013] Preferably, step S3 includes:

[0014] Step S31: After the parking operation is completed, wait for the preset time T1;

[0015] Step S32: Determine whether the voltage transition flag F1 is true. If the voltage transition flag F1 is true, the electronic parking system will perform a re-clamping operation. If the voltage transition flag F1 is false, the parking operation will end.

[0016] Preferably, in step S32, if the voltage rise of the voltage transition flag F1 is greater than the preset threshold V, then the voltage transition flag F1 is determined to be true; if the voltage rise of the voltage transition flag F1 is less than or equal to the preset threshold V, then the voltage transition flag F1 is determined to be false.

[0017] Preferably, in step S2, the real-time value of the power supply voltage is obtained through the built-in sampling circuit of the electronic parking system or the vehicle communication signal.

[0018] Preferably, the re-clamping control method is applied to the on-board computer of a standalone electronic parking system, or to an on-board computer that integrates electronic parking system software.

[0019] The beneficial effects of this invention are:

[0020] This invention monitors the step change in the power supply voltage during parking and performs a re-clamping operation after segmented parking. This effectively reduces the risk of insufficient parking force and slippage caused by current jumps due to step changes in the battery power supply voltage during parking, thereby improving the safety of vehicle parking. Attached Figure Description

[0021] Figure 1 This is a flowchart of the re-clamping control method for an electronic parking system according to the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Through long-term research, the inventors discovered that during actual parking, when the battery management system performs intelligent charging, it causes a step change in the battery's supply voltage. Since the electronic parking system determines whether the target clamping force has been reached based on the current magnitude, the voltage jump during intelligent charging will cause the current to rise during parking. The parking system may mistakenly judge that the target clamping force has been reached, but the actual clamping force has not reached the target clamping force, resulting in insufficient actual parking force and thus creating the safety risk of the vehicle rolling away.

[0027] Examples, such as Figure 1 As shown, a re-clamping control method for an electronic parking system includes:

[0028] Step S1: Obtain the slope of the vehicle's position when parking, map the target clamping force used for parking based on the correspondence between slope and clamping force, and record it as clamping force N1.

[0029] Step S2: The electronic parking system performs parking operation with the clamping current corresponding to the clamping force N1 as the target clamping current. During the parking operation, the system acquires the real-time value of the power supply voltage. If the power supply voltage changes, it is recorded as voltage change flag F1.

[0030] Step S3: Determine whether the voltage jump flag F1 is true. If the voltage jump flag F1 is true, perform the re-clamping operation after the parking operation is completed; if the voltage jump flag F1 is false, end the parking operation after the parking operation is completed.

[0031] This invention monitors the step change in the power supply voltage during parking and performs a re-clamping operation after segmented parking. This effectively reduces the risk of insufficient parking force and slippage caused by current jumps due to step changes in the battery power supply voltage during parking, thereby improving the safety of vehicle parking.

[0032] Specific embodiment 1, such as Figure 1 As shown, a re-clamping control method for an electronic parking system includes:

[0033] Step S1: First, obtain the slope of the vehicle's position when parking, that is, monitor the slope of the vehicle's position when parking. Then, based on the correspondence between the slope and the clamping force, map out the target clamping force used for parking and record it as clamping force N1.

[0034] Step S2: The electronic parking system performs parking operation with the clamping current corresponding to the clamping force N1 as the target clamping current. During the parking operation, the system acquires the real-time value of the power supply voltage. If the power supply voltage changes, it is recorded as voltage change flag F1.

[0035] Preferably, step S2 specifically includes:

[0036] Step S21: The actuator of the electronic parking system performs parking operation with the clamping current corresponding to the clamping force N1 as the target clamping current until parking is completed.

[0037] Step S22: During the parking operation performed by the actuator of the electronic parking system, the battery supply voltage is detected and monitored in real time to obtain the real-time value of the supply voltage. If the supply voltage jumps or steps, it is recorded as voltage jump flag F1.

[0038] Specifically, in step S22, the real-time value of the power supply voltage can be obtained through the built-in sampling circuit of the electronic parking system or the vehicle communication signal.

[0039] Step S3: Determine whether the voltage jump flag F1 is true. If the voltage jump flag F1 is true, perform the re-clamping operation after the parking operation is completed; if the voltage jump flag F1 is false, end the parking operation after the parking operation is completed.

[0040] Preferably, step S3 specifically includes:

[0041] Step S31: After the parking operation is completed, wait for a preset time T1, that is, after the parking operation is completed, execute step S32 after a preset time T1 interval.

[0042] Step S32: Determine whether the voltage transition flag F1 is true. If the voltage transition flag F1 is true, the electronic parking system will perform a re-clamping operation. If the voltage transition flag F1 is false, the parking operation will end.

[0043] The criteria for determining whether the voltage jump flag F1 is true are as follows: if the voltage rise of the voltage jump flag F1 is greater than the preset threshold V, then the voltage jump flag F1 is determined to be true; if the voltage rise of the voltage jump flag F1 is less than or equal to the preset threshold V, then the voltage jump flag F1 is determined to be false.

[0044] More preferably, in step S32, the re-clamping operation is performed by the electronic parking system with the clamping current corresponding to the clamping force N2 as the target clamping current, and N2≥N1.

[0045] Specifically, the clamping force N2 can be distributed according to the current slope, or it can be a constant, large clamping force.

[0046] More preferably, the re-clamping control method is applied to the on-board computer of a standalone electronic parking system, or to an on-board computer that integrates electronic parking system software.

[0047] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0048] This invention improves vehicle parking safety by detecting and monitoring the power supply voltage in real time during the parking process. During segmented parking, it identifies voltage jumps and performs a re-clamping operation after parking is completed.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A re-clamping control method for an electronic parking system, characterized in that, include: Step S1: Obtain the slope of the vehicle's position when parking, map the target clamping force used for parking based on the correspondence between slope and clamping force, and record it as clamping force N1; Step S2: The electronic parking system performs parking operation with the clamping current corresponding to the clamping force N1 as the target clamping current. During the parking operation, the system acquires the real-time value of the power supply voltage. If the power supply voltage jumps, it is recorded as voltage jump flag F1. Step S3: Determine whether the voltage jump flag F1 is true. If the voltage jump flag F1 is true, perform the re-clamping operation after the parking operation is completed; if the voltage jump flag F1 is false, end the parking operation after the parking operation is completed.

2. The re-clamping control method for an electronic parking system according to claim 1, characterized in that, The re-clamping operation is performed by the electronic parking system with the clamping current corresponding to the clamping force N2 as the target clamping current, and N2≥N1.

3. The re-clamping control method for an electronic parking system according to claim 2, characterized in that, Step S3 includes: Step S31: After the parking operation is completed, wait for the preset time T1; Step S32: Determine whether the voltage transition flag F1 is true. If the voltage transition flag F1 is true, the electronic parking system will perform a re-clamping operation. If the voltage transition flag F1 is false, the parking operation will end.

4. The re-clamping control method for an electronic parking system according to claim 3, characterized in that, In step S32, if the voltage rise of the voltage transition flag F1 is greater than the preset threshold V, then the voltage transition flag F1 is determined to be true; if the voltage rise of the voltage transition flag F1 is less than or equal to the preset threshold V, then the voltage transition flag F1 is determined to be false.

5. The re-clamping control method for an electronic parking system according to claim 1, characterized in that, In step S2, the real-time value of the power supply voltage is obtained through the built-in sampling circuit of the electronic parking system or the vehicle communication signal.

6. The re-clamping control method for an electronic parking system according to claim 1, characterized in that, The re-clamping control method is applied to the on-board computer of a standalone electronic parking system, or to an on-board computer that integrates electronic parking system software.

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