Parking braking system and parking and releasing control method

Abstract

The invention discloses a parking braking system and a parking and releasing control method, and belongs to the technical field of automobile control, the system comprises an electronic parking braking system, a vehicle control unit, an instrument panel module, a parking execution mechanism (MOC) and a knob switch, the electronic parking braking system comprises a first electronic control unit (ECU) and a power source, the instrument panel module comprises a second electronic control unit (ECU) and an instrument panel display screen, and the output end of the first electronic control unit (ECU) is connected with the input end of the parking execution mechanism (MOC); and the parking actuating mechanism (MOC) is connected with the power supply through a knob switch. When the parking executing mechanism (MOC) is controlled to be invalid through the electronic parking braking system, the parking executing mechanism (MOC) can be controlled through the knob switch, namely, by means of the parking and releasing device, when the electronic parking braking system is invalid, parking and releasing can still be achieved on a slope with the gradient value not smaller than 30% under the full-load condition.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile control, and in particular, relates to a parking brake system and a parking and releasing control method. Background Art

[0002] Conventional automatic transmission gasoline vehicles all have a P gear mechanical mechanism in their transmissions, but most electric vehicles currently equipped with an electronic parking brake system (EPB system) have cancelled the P gear mechanical mechanism in order to reduce the cost of the entire vehicle.

[0003] However, after these electric vehicles cancel the P gear mechanical mechanism, they still need to meet the requirements of relevant regulations (GB21670-4.2.19) that after their electronic parking brake system (EPB system) fails, they can still park and release on a slope with a slope value of 8% when fully loaded.

[0004] Patent CN108501925B discloses a control method and system for automatically releasing parking by an electronic parking brake system, the method comprising: determining whether the vehicle engine is started; if so, determining whether the vehicle is in a parking state; if so, determining whether the brake pedal of the vehicle is stepped on; if so, determining whether the slope value of the vehicle is currently less than or equal to a preset slope value; if so, determining whether the gear position of the vehicle is switched to a forward gear or a reverse gear; if so, executing the release of parking. The technical solution in this patent determines the driver's driving intention by monitoring the change of the gear position signal, and determines whether the current state allows the EPB to be automatically released by shifting gears by monitoring the road slope value, thereby avoiding the safety risks and the deterioration of fuel economy and comfort caused by the driver deliberately stepping on the accelerator to release the EPB parking.

[0005] However, the technology disclosed in the above patent cannot achieve parking and releasing on a slope with a slope value of not less than 30% when the electronic parking brake system fails and the vehicle is fully loaded. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a parking brake system and a parking and release control method in view of the deficiencies in the prior art, so as to achieve the purpose of parking and releasing on a slope with a slope value of not less than 30% under full load when the electronic parking brake system fails.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention provides a parking brake system, comprising an electronic parking brake system, a vehicle controller, an instrument panel module, a parking actuator (MOC), and a knob switch. The electronic parking brake system comprises a first electronic control unit (ECU) and a power supply, and the instrument panel module comprises a second electronic control unit (ECU) and an instrument panel display screen, wherein the output end of the first electronic control unit (ECU) is connected to the input end of the vehicle controller; the output end of the first electronic control unit (ECU) is connected to the input end of the parking actuator (MOC); the input end of the first electronic control unit (ECU) is connected to the output end of the power supply; the output end of the vehicle controller is connected to the input end of the second electronic control unit (ECU); the output end of the second electronic control unit (ECU) is connected to the input end of the instrument panel display screen; and the parking actuator (MOC) is connected to the power supply via the knob switch.

[0009] Furthermore, the parking control mechanism (MOC) is controlled by a first electronic control unit (ECU).

[0010] Furthermore, the first electronic control unit (ECU) sends a fault signal to the vehicle controller; the vehicle controller sends a fault signal to the second electronic control unit (ECU); the second electronic control unit (ECU) controls the instrument panel display screen to give a fault prompt.

[0011] Furthermore, the parking control mechanism (MOC) is controlled by the rotary switch.

[0012] Furthermore, a first wire, a second wire, a third wire and a fourth wire are provided inside the knob switch.

[0013] Furthermore, the power source is connected to the parking actuator (MOC) through the first wire and the second wire to form a first loop; the power source is connected to the parking actuator (MOC) through the third wire and the fourth wire to form a second loop.

[0014] Further, when the first circuit is turned on by the rotary switch, the parking actuator (MOC) is driven in the clamping direction; when the second circuit is turned on by the rotary switch, the parking actuator (MOC) is driven in the releasing direction.

[0015] Furthermore, the knob switch is arranged on the auxiliary instrument panel of the automobile.

[0016] Furthermore, a protective cover is provided on the knob switch.

[0017] The present invention also provides a parking and releasing control method for the above parking brake system, the method comprising the following steps:

[0018] S1: Controlling a parking actuator (MOC) to perform parking and releasing through a first electronic control unit (ECU);

[0019] S2: judging whether the parking and releasing are successfully executed by controlling the parking actuator (MOC) through the first electronic control unit (ECU), if unsuccessful, entering S3, if successful, entering S7;

[0020] S3: Sending a fault signal to a vehicle controller via a first electronic control unit (ECU);

[0021] S4: Sending a fault signal to a second electronic control unit (ECU) via the vehicle controller;

[0022] S5: Control the instrument panel display screen to give a fault prompt through the second electronic control unit (ECU);

[0023] S6: Control the parking actuator (MOC) through the knob switch to perform parking and release;

[0024] S7: End.

[0025] The parking brake system and the parking and releasing control method of the present invention have the following advantages:

[0026] (1) Through the parking brake system and the parking and releasing control method of the present invention, when the electronic parking brake system fails, the vehicle can still be parked and released on a slope with a slope value of not less than 30% under full load.

[0027] (2) By controlling the parking actuator (MOC) through the knob switch in the present invention, parking and releasing can be achieved even when the electronic parking brake system fails, and the operation is simple.

[0028] (3) The rotary switch of the present invention is provided with a protective cover to prevent accidental touching of the rotary switch when the rotary switch is not needed.

[0029] (4) Regarding the requirement of being able to park and release the vehicle when the electronic parking brake system fails, the present invention does not adopt the traditional dual-path control or backup control unit, but instead achieves parking and releasing the vehicle when the electronic parking brake system fails by setting a knob switch, which is simpler and has lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] This specification includes the following drawings, which show the following contents:

[0031] Figure 1 is a logic structure block diagram of a parking brake system of the present invention;

[0032] Figure 2 It is an internal principle diagram of a rotary switch of the present invention;

[0033] Figure 3 It is a flow chart of a parking and releasing control method of the present invention.

[0034] Explanation of the reference numerals: 1. electronic parking brake system; 2. vehicle controller; 3. instrument panel module; 4. parking actuator (MOC); 5. rotary switch; 11. first electronic control unit (ECU); 12. power supply; 31. second electronic control unit (ECU); 32. instrument panel display screen; 51. first wire; 52. second wire; 53. third wire; 54. fourth wire. DETAILED DESCRIPTION

[0035] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0036] Figure 1 It is a logical structure block diagram of a parking brake system of the present invention, including an electronic parking brake system 1, a vehicle controller 2, an instrument panel module 3, a parking actuator (MOC) 4, and a knob switch 5. The electronic parking brake system 1 includes a first electronic control unit (ECU) 11 and a power supply 12. The instrument panel module 3 includes a second electronic control unit (ECU) 31 and an instrument panel display screen 32. The output end of the first electronic control unit (ECU) 11 is connected to the input end of the vehicle controller 2; the output end of the first electronic control unit (ECU) 11 is connected to the input end of the parking actuator (MOC) 4; the input end of the first electronic control unit (ECU) 11 is connected to the output end of the power supply 12; the output end of the vehicle controller 2 is connected to the input end of the second electronic control unit (ECU) 31; the output end of the second electronic control unit (ECU) 11 is connected to the input end of the instrument panel display screen 32; the parking actuator (MOC) 4 is connected to the power supply 12 through the knob switch 5.

[0037] Figure 2 This is an internal schematic diagram of a rotary switch 5 of the present invention. Figure 2 As can be seen, the knob switch 5 is provided with a first wire 51, a second wire 52, a third wire 53 and a fourth wire 54. The power source 12 is connected to the parking actuator (MOC) 4 through the first wire 51 and the second wire 52 to form a first loop; the power source 12 is connected to the parking actuator (MOC) 4 through the third wire 53 and the fourth wire 54 to form a second loop. Figure 2It can be seen that when the first circuit is turned on and the second circuit is turned on, the current flowing through the parking actuator (MOC) 4 is in the opposite direction. When the first circuit is turned on by the knob switch 5, the parking actuator (MOC) 4 is driven in the clamping direction; when the second circuit is turned on by the knob switch 5, the parking actuator (MOC) 4 is driven in the releasing direction.

[0038] in, Figure 2 The figure does not show the initial state of the rotary switch 5. Figure 2 The state shown in the figure is when the first circuit is conducting. Figure 2 C and C1 in the figure are rotated to Figure 2 The state of the rotary switch 5 when the A and A1 are in the position is the initial state of the rotary switch 5. Figure 2 There is no wire connection between the two Cs and the two C1s, so when the knob switch 5 is in the initial state, the power supply 12 and the parking actuator (MOC) 4 do not form a loop.

[0039] In this embodiment, the rotary switch 5 is arranged on the auxiliary instrument panel of the automobile, and a protective cover is arranged on the rotary switch 5. However, the rotary switch 5 is not limited to being arranged on the auxiliary instrument panel of the automobile, but can be specifically set according to specific circumstances, and the above-mentioned protective cover can adopt an existing protective cover. In addition, metal sheets are respectively arranged at the positions A, A1, B, and B1 on the side wall of the rotary switch 5.

[0040] Combine the following Figure 1 and Figure 2 The working principle of the present invention is introduced as follows:

[0041] When the parking brake system of the present invention controls the parking actuator (MOC) 4 to perform parking and release, the parking actuator (MOC) 4 is first controlled by the electronic parking brake system 1 in the parking brake system, specifically, the parking actuator (MOC) 4 is controlled by the first electronic control unit (ECU) 11. When the parking actuator (MOC) 4 is successfully controlled by the first electronic control unit (ECU) 11 to perform parking and release, the parking and release work is completed; when the parking actuator (MOC) 4 is not successfully controlled by the first electronic control unit (ECU) 11 to perform parking and release, the parking actuator (MOC) is controlled by the knob switch 5 instead.

[0042] Furthermore, the principle of controlling the parking actuator (MOC) to perform parking and releasing by the knob switch 5 is as follows:

[0043] When the first electronic control unit (ECU) 11 fails to successfully control the parking actuator (MOC) 4 to execute parking and releasing, a fault signal is first sent to the vehicle controller 2 through the first electronic control unit (ECU) 11, and then the vehicle controller 2 sends a fault signal to the second electronic control unit (ECU) 31, and then the second electronic control unit (ECU) 31 controls the instrument panel display screen 32 to give a fault prompt. Specifically, when the first electronic control unit (ECU) 11 fails to successfully control the parking actuator (MOC) 4 to perform parking and releasing, the fault signal of the electronic parking brake system 1 is first sent to the vehicle controller 2 through the first electronic control unit (ECU) 11. After the vehicle controller 2 receives the fault signal of the electronic parking brake system 1 sent by the first electronic control unit (ECU) 11, the vehicle controller 2 will send the fault signal of the electronic parking brake system 1 to the second electronic control unit (ECU) 31. After the second electronic control unit (ECU) 31 receives the fault signal of the electronic parking brake system 1 sent by the vehicle controller 2, the second electronic control unit (ECU) 31 will give a fault prompt by controlling the instrument panel display screen 32.

[0044] Among them, the aforementioned fault prompt includes prompting the user through text on the instrument panel display screen 32 that the electronic parking brake system 1 has failed. At this time, the parking actuator (MOC) 4 can be controlled by the knob switch 5 to perform parking and release; the aforementioned fault prompt also includes the corresponding yellow fault light of the electronic parking brake system 1 on the instrument panel display screen 32 turning on.

[0045] When the knob switch 5 is used to control the actuator (MOC) 4 to perform parking and release, when the knob switch 5 is rotated from the initial state to the state where the first circuit composed of the first wire 51, the second wire 52, the power supply 12 and the parking actuator (MOC) 4 is turned on, the parking actuator (MOC) 4 is driven in the clamping direction to realize the parking function; when the knob switch 5 is rotated to make the second circuit composed of the third wire 53, the fourth wire 54, the power supply 12 and the parking actuator (MOC) 4 turned on, the parking actuator (MOC) 4 is driven in the release direction to realize the release function.

[0046] Figure 3 1 is a flowchart of a parking and releasing control method of the present invention, the method comprising the following steps:

[0047] S1: The parking actuator (MOC) 4 is controlled by the first electronic control unit (ECU) 11 to perform parking and release; that is, corresponding to Figure 3Specifically, under normal circumstances, that is, when the electronic parking brake system 1 is not invalid, the parking brake actuator (MOC) 4 is controlled by the first electronic control unit (ECU) 11 to perform parking and releasing.

[0048] S2: Determine whether the parking and releasing operation is successful by controlling the parking actuator (MOC) 4 through the first electronic control unit (ECU) 11. If unsuccessful, enter S3. If successful, enter S7. Figure 3 Specifically, if the parking actuator (MOC) 4 is not successfully controlled by the first electronic control unit (ECU) 11 to perform parking and release, then enter S3; if the parking actuator (MOC) 4 is successfully controlled by the first electronic control unit (ECU) 11 to perform parking and release, then enter S7.

[0049] S3: Sending a fault signal to the vehicle controller 2 via the first electronic control unit (ECU) 11; Figure 3 Specifically, when the parking brake actuator (MOC) 4 is unsuccessfully controlled by the first electronic control unit (ECU) 11 to perform parking and releasing, the first electronic control unit (ECU) 11 will send a fault signal of the electronic parking brake system 1 to the vehicle controller 2 .

[0050] S4: Sending a fault signal to the second electronic control unit (ECU) 31 via the vehicle controller 2; Figure 3 Specifically, after the vehicle controller 2 receives the fault signal of the electronic parking brake system 1 sent by the first electronic control unit (ECU) 11 , the vehicle controller 2 sends the fault signal of the electronic parking brake system 1 to the second electronic control unit (ECU) 31 .

[0051] S5: The second electronic control unit (ECU) 31 controls the instrument panel display screen 32 to give a fault prompt; that is, the corresponding Figure 3 S5 in the figure. Specifically, after the second electronic control unit (ECU) 31 receives the fault signal of the electronic parking brake system 1 sent by the vehicle controller 2, the second electronic control unit (ECU) 31 will control the instrument panel display screen 32 to give a fault prompt. The fault prompt includes prompting the user through text on the instrument panel display screen 32 that the electronic parking brake system 1 has failed, and the parking actuator (MOC) 4 can be controlled by the knob switch 5 to perform parking and release; the fault prompt also includes the yellow fault light of the corresponding electronic parking brake system 1 on the instrument panel display screen 32 lighting up.

[0052] S6: Control the parking actuator (MOC) 4 through the knob switch 5 to perform parking and release; Figure 3Specifically, when the first circuit consisting of the first wire 51, the second wire 52, the power supply 12 and the parking actuator (MOC) 4 is turned on by rotating the knob switch 5, the parking actuator (MOC) 4 is driven in the clamping direction to achieve parking; when the second circuit consisting of the third wire 53, the fourth wire 54, the power supply 12 and the parking actuator (MOC) 4 is turned on by rotating the knob switch 5, the parking actuator (MOC) 4 is driven in the releasing direction to achieve release.

[0053] S7: End; corresponding Figure 3 S7 in.

[0054] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A parking brake system, characterized in that: It includes an electronic parking brake system, a vehicle controller, an instrument panel module, a parking actuator (MOC), and a knob switch. The electronic parking brake system includes a first electronic control unit (ECU) and a power supply. The instrument panel module includes a second electronic control unit (ECU) and an instrument panel display screen. The output end of the first electronic control unit (ECU) is connected to the input end of the vehicle controller; the output end of the first electronic control unit (ECU) is connected to the input end of the parking actuator (MOC); the input end of the first electronic control unit (ECU) is connected to the output end of the power supply; the output end of the vehicle controller is connected to the input end of the second electronic control unit (ECU); the output end of the second electronic control unit (ECU) is connected to the input end of the instrument panel display screen; the parking actuator (MOC) is connected to the power supply through the knob switch.

2. A parking brake system according to claim 1, characterized in that: The parking control mechanism (MOC) is controlled by the first electronic control unit (ECU).

3. A parking brake system according to claim 1, characterized in that: The first electronic control unit (ECU) sends a fault signal to the vehicle controller; the vehicle controller sends a fault signal to the second electronic control unit (ECU); the second electronic control unit (ECU) controls the instrument panel display screen to provide a fault prompt.

4. A parking brake system according to claim 1, characterized in that: The parking control mechanism (MOC) is controlled by the rotary switch.

5. A parking brake system according to claim 4, characterized in that: The knob switch is internally provided with a first conductive wire, a second conductive wire, a third conductive wire and a fourth conductive wire.

6. A parking brake system according to claim 5, characterized in that: The power source is connected to the parking actuator (MOC) through the first wire and the second wire to form a first loop; the power source is connected to the parking actuator (MOC) through the third wire and the fourth wire to form a second loop.

7. A parking brake system according to claim 6, characterized in that: When the first circuit is turned on by the rotary switch, the parking actuator (MOC) is driven in the clamping direction; when the second circuit is turned on by the rotary switch, the parking actuator (MOC) is driven in the releasing direction.

8. A parking brake system according to claim 7, characterized in that: The knob switch is arranged on the auxiliary instrument panel of the automobile.

9. A parking brake system according to claim 8, characterized in that: A protective cover is arranged on the knob switch.

10. A parking and release control method for a system as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: Controlling a parking actuator (MOC) to perform parking and releasing through a first electronic control unit (ECU); S2: judging whether the parking and releasing are successfully executed by controlling the parking actuator (MOC) through the first electronic control unit (ECU), if unsuccessful, entering S3, if successful, entering S7; S3: Sending a fault signal to a vehicle controller via a first electronic control unit (ECU); S4: Sending a fault signal to a second electronic control unit (ECU) via the vehicle controller; S5: Control the instrument panel display screen to give a fault prompt through the second electronic control unit (ECU); S6: Control the parking actuator (MOC) through the knob switch to perform parking and release; S7: End.

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