CN112265531A - Electronic parking brake control system and control method for motor vehicle - Google Patents
Electronic parking brake control system and control method for motor vehicle Download PDFInfo
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- CN112265531A CN112265531A CN202011193535.7A CN202011193535A CN112265531A CN 112265531 A CN112265531 A CN 112265531A CN 202011193535 A CN202011193535 A CN 202011193535A CN 112265531 A CN112265531 A CN 112265531A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention relates to the technical field of equipment detection, and discloses an electronic parking brake control system and a control method for a motor vehicle, which comprise an EPB electronic control unit and a vehicle-mounted electronic control unit, wherein the EPB electronic control unit (1) is in control connection with a first electronic caliper executing mechanism (5), and the vehicle-mounted electronic control unit (2) is in control connection with a second electronic caliper executing mechanism (6); the vehicle-mounted electronic control system further comprises a signal output module, the signal output module (7) is connected with the EPB electronic control unit (1), the EPB electronic control unit receives signals of the signal output module (7) to judge the current state of the vehicle, and the EPB electronic control unit (1) and the vehicle-mounted electronic control unit control the first electronic caliper executing mechanism (5) or/and the second electronic caliper executing mechanism according to the signals transmitted by the EPB switch module (4) and the signals output by the signal output module. The system has a dual-redundancy function, the safety is higher, and the brake of the electronic parking system is not degraded.
Description
Technical Field
The invention relates to the field of equipment detection, in particular to an electronic parking brake control system and a control method for a motor vehicle.
Background
The automobile industry rises rapidly along with electromotion, intellectualization, networking and sharing, new business opportunities and challenges are brought to part enterprises, and intelligent systems such as unmanned driving and auxiliary driving are applied to automobiles, and higher requirements are put forward on functional safety requirements of automobiles and parts. In order to meet the requirements of reliability and functional safety of automobiles and parts, the development of EPB products with dual redundancy is a trend. In response to the demand for the electric vehicle to cancel the P range lock mechanism, it is necessary to select a product that is a substitute for the function thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an electronic parking brake control system and a control method for a motor vehicle.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the electronic parking brake control system for the motor vehicle comprises an EPB electronic control unit and a vehicle-mounted electronic control unit, wherein the EPB electronic control unit is connected with the vehicle-mounted electronic control unit through a CAN bus, the electronic parking brake control system also comprises an EPB switch module, the EPB switch module is connected with the EPB electronic control unit and the vehicle-mounted electronic control unit, the EPB electronic control unit is connected with a first electronic caliper executing mechanism in a control mode, and the vehicle-mounted electronic control unit is connected with a second electronic caliper executing mechanism in a control mode; the vehicle-mounted electronic control system further comprises a signal output module, the signal output module is connected with the EPB electronic control unit, the EPB electronic control unit receives signals of the signal output module to judge the current state of the vehicle, and the EPB electronic control unit and the vehicle-mounted electronic control unit control the first electronic caliper executing mechanism or/and the second electronic caliper executing mechanism according to the signals transmitted by the EPB switch module and the signals output by the signal output module.
Preferably, the EPB switch module comprises an EPB touch switch module and an EPB key switch module, and the EPB touch switch module is connected with the EPB electronic control unit and the vehicle-mounted electronic control unit and transmits signals to the EPB electronic control unit and the vehicle-mounted electronic control unit; the EPB key switch module is connected with the EPB electronic control unit and the vehicle-mounted electronic control unit and transmits signals to the EPB electronic control unit and the vehicle-mounted electronic control unit.
Preferably, the vehicle-mounted electronic control unit and the EPB electronic control unit both comprise a signal detection circuit for identifying the EPB signal module, the vehicle-mounted electronic control unit and the EPB electronic control unit both comprise a signal detection circuit for an EPB touch switch module and an EPB key switch module, the EPB touch switch module signal detection circuits of the vehicle-mounted electronic control unit and the EPB electronic control unit are both connected with the EPB touch switch module, and the EPB key signal detection circuits of the vehicle-mounted electronic control unit and the EPB electronic control unit are both connected with the EPB key switch module.
Preferably, the signal output module comprises one or more of an accelerator pedal signal module, an ignition switch signal module, a brake pedal signal module, a P-gear signal module and a P-handle position signal module, and the EPB electronic control unit comprises detection circuits in one-to-one correspondence with the signal modules.
Preferably, the EPB electronic control unit includes a signal detection circuit for detecting a signal of the signal output module, and when the signal detection circuit of the EPB electronic control unit fails to normally detect that the corresponding signal output module sends a signal, and the EPB switch module sends a parking/release or emergency brake command, the system does not execute or degrade the execution of the electronic caliper actuator connected to the EPB electronic control unit.
Preferably, the electronic parking brake control system for the motor vehicle according to any one of claims 1 to 5 is included, and the control method thereof includes the steps of:
s1, when the EPB switch module is operated by a person, the EPB switch module simultaneously sends parking/releasing or emergency braking instructions to the EPB electronic control unit and the vehicle-mounted electronic control unit, and the EPB electronic control unit and the vehicle-mounted electronic control unit detect whether signals are normally received or not, wherein the signals comprise a normal working state and an abnormal working state;
s2, detecting whether the signal of the signal output module is normally received by a signal detection circuit of the EPB electronic control unit and does not include normal work and abnormal work;
s3, if the S1 and the S2 work normally, the EPB electronic control unit controls the first electronic caliper executing mechanism to execute a parking/releasing or emergency braking instruction, and the vehicle-mounted electronic control unit controls the second electronic caliper executing mechanism to execute the parking/releasing or emergency braking instruction;
s4, if the step S1 works normally and the step S2EPB electronic control unit works abnormally, the first electronic caliper executing mechanism does not execute a parking/releasing or emergency braking instruction, or the parking/releasing or emergency braking instruction is executed in a degraded mode, and the vehicle-mounted electronic control unit controls the second electronic caliper executing mechanism to execute the parking/releasing or emergency braking instruction;
s5, if the circuit for detecting the EPB switch module signal of the step S1 normally receives the signal for detecting the EPB switch module, the circuit for detecting the EPB switch module signal of the vehicle-mounted electronic control unit cannot normally receive the signal for detecting the EPB switch module, and the EPB electronic control unit normally works of the step S2, the EPB electronic control unit controls the first caliper actuator to execute the parking/releasing or emergency braking command.
Preferably, the signal output module comprises a P-gear signal module and/or a P-handle signal module, the EPB electronic control unit comprises a P-gear signal detection circuit corresponding to the P-gear signal module or/and a P-handle signal detection module corresponding to the P-handle signal module, and when the CAN bus signal detection circuit, the P-gear signal module and/or the P-handle signal module of the EPB electronic control unit detects one or both of the P-handle signal and the P-handle signal, or the CAN bus detects one or both of the P-handle signal and the P-handle signal, the EPB electronic control unit and the vehicle-mounted electronic control unit execute the parking/release instruction.
The electronic parking braking system designed by the invention has the following technical effects:
the novel EPB product is used as an automobile electronic parking brake system, and on the premise of meeting motor vehicle parking regulations, the redundancy detection control of double EPB switches and the detection of P-gear or P-handle hard-line signals or the redundancy detection control of corresponding signals on a CAN bus are combined, and the function of replacing a P-gear locking mechanism is also met, and the system is combined with the redundancy control configuration of double ECUs and completely meets the safety requirements of ISO 26262 functions. The EPB electronic control unit can ensure that a driver can operate any one EPB switch without leaving a driving position to realize that the system performance and the function are not degraded, and adopts double redundancy detection of a gearbox gear signal, a gear operating handle lever position signal, a P lever position signal detection circuit and a P gear signal detection circuit of the EPB electronic control unit to meet the requirement of replacing a P gear locking mechanism. And a fault discrimination mode is adopted, so that the EPB electronic control unit has more reliable use, and the EPB electronic control unit provides a double redundant control function for at least single-wheel parking/releasing or emergency braking.
Drawings
Fig. 1 is a schematic connection diagram of a control system.
Fig. 2 is a schematic view of the engagement of the brake and the brake disc.
Fig. 3 is a schematic view of the structure of the brake.
Fig. 4 is a schematic view of the internal structure of the brake.
FIG. 5 is a block diagram of the screw, ball and duct.
FIG. 6 is a schematic view of a nut sleeve.
The names of the parts indicated by the numerical references in the drawings are as follows: 1-EPB electronic control unit, 2-vehicle electronic control unit, 3-CAN bus, 4-EPB switch module, 5-first electronic caliper actuating mechanism, 6-second electronic caliper actuating mechanism, 7-signal output module, 8-EPB touch switch module, 9-EPB key switch module, 10-touch switch detection circuit, 11-key switch detection circuit, 13-ignition switch signal module, 50-brake pedal signal module, 14-P gear signal module, 15-P handle signal module, 16-ignition switch signal detection circuit, 17-brake pedal signal detection circuit, 18-P gear signal detection circuit, 19-P handle signal detection circuit, 20-accelerator pedal signal detection circuit, 21-accelerator pedal signal module, 22-CAN bus signal detection circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
An electronic parking brake control system for a motor vehicle comprises an EPB electronic control unit 1 and a vehicle-mounted electronic control unit 2, wherein the embodiment adopts two ECUs to realize dual redundancy control, namely, when the EPB key switch module 9 or the EPB touch switch module 8 is used for implementing parking/releasing or emergency braking, the EPB electronic control unit 1EPB _ ECU and the vehicle-mounted electronic control unit 2 vehicle-mounted _ ECU carry out signal self-checking at the same time, and the two ECUs are used for implementing parking/releasing or emergency braking under the condition that the two ECUs judge that the vehicle-mounted electronic control unit works normally, and the hardware structure of the system has dual redundancy control function safety requirements. The device has the advantages that when one EPB switch is damaged, a driver can conveniently operate the system to normally work, when one ECU is damaged, the other ECU performs unilateral work, and the device can replace the work after the P gear locking mechanism of the whole vehicle is cancelled.
In the embodiment, the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 are connected through the CAN bus 3, and the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 perform information interaction through the CAN bus 3. The electronic parking control system further comprises an EPB switch module 4, the EPB switch module is connected with an EPB electronic control unit 1 and a vehicle-mounted electronic control unit 2, the EPB electronic control unit 1 is connected with a first electronic caliper executing mechanism 5 in a control mode, and the vehicle-mounted electronic control unit 2 is connected with a second electronic caliper executing mechanism 6 in a control mode; the vehicle-mounted electronic control system further comprises a signal output module 7, the signal output module 7 is connected with the EPB electronic control unit 1, the EPB electronic control unit 1 receives signals of the signal output module 7 to judge the current state of the vehicle, and the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 control the first electronic caliper executing mechanism 5 or/and the second electronic caliper executing mechanism 6 according to the signals transmitted by the EPB switch module 4 and the signals output by the signal output module 7.
The EPB switch module 4 can transmit signals to the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 at the same time, so that the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 perform self-inspection on themselves, determine whether to execute parking braking or emergency braking, and determine to execute single-side braking or double-side braking.
The EPB switch module 4 comprises an EPB touch switch module 8 and an EPB key switch module 9, the EPB touch switch module 8 is connected with the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 and transmits signals to the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2; the EPB key switch module 9 is connected with the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 and transmits signals to the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2.
The vehicle-mounted electronic control unit 2 and the EPB electronic control unit 1 both comprise a signal detection circuit for identifying an EPB signal module, the vehicle-mounted electronic control unit 2 and the EPB electronic control unit 1 both comprise a signal detection circuit for an EPB touch switch module 8 and a signal detection circuit for an EPB key switch module 9, the vehicle-mounted electronic control unit 2 and the EPB electronic control unit 1 have the EPB touch switch module 8 connected with the signal detection circuit for the EPB touch switch module 8, and the vehicle-mounted electronic control unit 2 and the EPB electronic control unit 1 have the EPB key signal detection circuit connected with the EPB key switch module 9. When the EPB key switch module 9 signal detection circuit and the EPB touch switch module 8 signal detection circuit of the EPB electronic control unit 1 or the vehicle-mounted electronic control unit 2 cannot work normally, it means that the EPB electronic control unit 1 or the vehicle-mounted electronic control unit 2 is in a fault state, and at this time, the other ECU working normally controls the connected electronic parking execution mechanism to execute a parking/release or emergency brake command.
In order to ensure the dual redundant control of the system, the signal output module 7 in the embodiment comprises one or more of an accelerator pedal signal module 21, an ignition switch signal module 13, a brake pedal signal module 50, a P gear signal module 14, an accelerator pedal signal module 21 and a P handle position signal module 15, the control system of the embodiment comprises all the signal output modules 7, the EPB electronic control unit 1 comprises detection circuits corresponding to the signal modules one to one, namely comprises an accelerator pedal signal detection circuit 20, an ignition switch signal detection circuit 16, a brake pedal signal detection circuit 17, a P gear signal detection circuit 18, an accelerator pedal signal detection circuit 20 and a P handle signal detection circuit 19, the detection circuit is used for detecting whether the EPB electronic control unit 1 can normally receive the signal sent by the corresponding hardware so as to judge whether the EPB electronic control unit 1 is in a normal working state.
From the above, it can be seen that the EPB ecu 1 in this embodiment includes a signal detection circuit for detecting the signal of the signal output module 7, and when the signal detection circuit of the EPB ecu 1 fails to normally detect that the corresponding signal output module 7 sends a signal, and the EPB switch module 4 sends a parking/release or emergency brake command, the system does not execute or degrade the electronic caliper executing mechanism connected to the EPB ecu 1.
In order to make the present solution as clear as possible, the present embodiment further provides an electronic parking brake control system for a motor vehicle, wherein the control method comprises the following steps:
s1, when the EPB switch module 4 is operated by a person, the EPB switch module 4 sends a parking/releasing or emergency braking instruction to the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 at the same time, and the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 detect whether signals are received normally or not, wherein the signals include two states of normal operation and abnormal operation; the normal work indicates that the EPB key switch module 9 or/and the EPB touch switch module 8 are normally connected with the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2, and the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 can normally receive and identify signals sent by the EPB key switch module 9 or/and the EPB touch switch module 8;
s2, detecting whether the signal of the signal output module 7 is normally received by a signal detection circuit of the EPB electronic control unit 1, wherein the signal detection circuit comprises a normal work and an abnormal work; the step is characterized by verifying whether the EPB electronic control unit 1 works normally and meets the functional safety requirement of ISO 26262;
s3, if the operation is normal in both S1 and S2, the EPB electronic control unit 1 controls the first electronic caliper executing mechanism 5 to execute a parking/releasing or emergency braking instruction, and the vehicle-mounted electronic control unit 2 controls the second electronic caliper executing mechanism 6 to execute the parking/releasing or emergency braking instruction;
s4, if the step S1 is normal, the step S2 is that the EPB electronic control unit 1 is abnormal, that is, the phenomenon that the signals cannot be normally transmitted exists between the EPB electronic control unit 1 and the signal output module 7, and the current EPB electronic control unit 1 has the risk of failure, the first electronic caliper executing mechanism 5 does not execute the parking/releasing or emergency braking instruction, or the parking/releasing or emergency braking instruction is degraded to be executed, and the vehicle-mounted electronic control unit 2 controls the second electronic caliper executing mechanism 6 to execute the parking/releasing or emergency braking instruction;
s5, if the circuit for detecting the EPB switch module 4 signal of the EPB electronic control unit 1 normally receives the signal for detecting the EPB switch module 4 at step S1, the circuit for detecting the EPB switch module 4 signal of the on-vehicle electronic control unit 2 cannot normally receive the signal for detecting the EPB switch module 4, and the EPB electronic control unit 1 normally operates at step S2, the EPB electronic control unit 1 controls the first caliper actuator to execute the parking/release or emergency brake command.
From the above, it CAN be seen that the signal output module 7 in this embodiment includes the P-shift signal module 14 and the P-range signal module 15, the EPB electronic control unit 1 includes the P-shift signal detection circuit 18 corresponding to the P-shift signal module 14 and the P-range signal detection circuit 19 corresponding to the P-range signal module 15, and when the CAN bus signal detection circuit 22, the P-shift signal module 14 and the P-range signal module 15 of the EPB electronic control unit 1 detect one or two of the P-range signal and the P-range signal, or the CAN bus 3 detects one or two of the P-range signal and the P-range signal, the EPB electronic control unit 1 and the vehicle-mounted electronic control unit 2 execute the parking/release instruction. The design can replace the traditional P-gear mechanical locking mechanism, adopts a mode of combining a P-gear signal or a P-handle position signal and an electronic control unit to drive the electronic caliper executing mechanism to execute a parking/releasing command, and meets the functional safety requirement of ISO 26262.
Example 2
The present embodiment is different from embodiment 1 in that the EPB electronic control unit 1 is replaced with another in-vehicle electronic control unit 2.
Example 3
The present embodiment is different from embodiment 1 in that the signal output module 7 includes one or more of an accelerator pedal signal module 21, an ignition switch signal module 13, a brake pedal signal module 50, a P-range signal module 14, and a P-range signal module 15, and the EPB electronic control unit 1 includes detection circuits corresponding to the signal modules one to one.
Example 4
In this embodiment, the first electronic brake caliper actuator 5 and the second electronic brake caliper actuator 6 are floating brakes, and include a caliper body 101, a brake area 201 is formed on the lower side of the caliper body 101, specifically, a caliper claw is arranged at the lower end of the caliper body 101, and the brake area 201 is formed by the lower ends of the caliper claw and the piston; in this embodiment, the piston is driven by a motor driving the screw 301 to drive the nut sleeve 601. The upper end of the screw 301 is fixed to the caliper body 101 by a bearing 501. The caliper body 101 is internally provided with a screw 301, the outside of the screw 301 is assembled with a nut sleeve 601, a ball 701 is arranged between the screw 301 and the nut sleeve 601, the nut sleeve 601 is provided with a conduit 801, the conduit 801, a spiral guide groove 901 of the screw 301 and a spiral guide groove 901 of the nut sleeve 601 form a circulating track 161 of the ball 701, the caliper further comprises a piston sleeve 100, the screw 301 rotates to drive the nut sleeve 601 to move linearly, and the nut sleeve 601 moves linearly to drive the piston sleeve 100 to move towards a brake disc 111. When the screw 301 rotates, the nut sleeve 601 is driven to move, wherein the ball 701 rolls on the circulating track 161, so that the resistance is reduced, the process is smoother, and the stability is better.
In this embodiment, the sealing ring 121 is sleeved on the outer wall of the piston sleeve 100 and the outer wall of the caliper body 101 in an interference manner, the inner wall of the caliper body 101 is provided with a limiting groove 131 for limiting the outer ring of the sealing ring 121, when the piston moves downwards under the thrust of the nut sleeve 601 to the braking area 201, the sealing ring 121 deforms, and when the nut sleeve 601 removes the external force on the piston, the sealing ring 121 deforms and recovers and drives the piston to return.
In order to facilitate the fixing and installation of the conduit 801, the conduit 801 further comprises a fixing piece 141, the outer side surface of the nut sleeve 601 is provided with an insertion hole 151, the insertion holes 151 are arranged in pairs, two ends of the conduit 801 are inserted into the insertion holes 151, the insertion holes 151 are communicated with a circulating track 161 formed by a spiral guide groove 901 of the screw 301 and a spiral guide groove 901 of the nut sleeve 601, the fixing piece 141 is clamped on the outer wall of the conduit 801 to fix the conduit 801 on the nut sleeve 601, and the fixing piece 141 is fixedly connected with the nut sleeve 601 through a mounting.
In order to facilitate the fixing of the fixing plate 141 and the conduit 801 and to occupy less space, the inner side of the fixing plate 141 of the present embodiment is formed with a slot 171 for limiting the conduit 801, and the number of the slots 171 matches the number of the conduits 801. In this embodiment, the number of the guide pipes 801 is two, and the whole fixing piece 141 is arranged in an "M" shape.
In this embodiment, the middle of the piston sleeve 100 is a cavity 181 with an opening at the upper end and a cover at the lower end, the outer wall of the nut sleeve 601 is provided with a limiting structure 191, and the limiting structure 191 is fan-shaped.
The brake further includes a mounting bracket 200, the mounting bracket 200 being fixedly mounted to the frame or other fixture. The caliper body 101 is connected to the mounting bracket 200 by a guide pin 241, and the caliper body 101 can move up and down along the guide pin 241. Specifically, the mounting bracket 200 is provided with two guide pins 241, and the caliper body 101 is provided with holes for engaging with the guide pins 241.
In order to facilitate rolling of the balls 701 and matching of the screw 301 and the nut sleeve 601, the oil injection nozzle 211 is arranged on the clamp body 101, the mounting cavity 221 is formed in the clamp body 101, the screw 301, the piston and the nut sleeve 601 are mounted in the mounting cavity 221, the oil injection nozzle 211 is communicated with the mounting cavity 221, and a closed space is formed by the inner wall of the mounting cavity 221, the outer wall of the piston and the upper end face of the sealing ring 121.
In this embodiment, the mounting section has an inner pad and an outer pad mounted therein, wherein the inner pad is located at the lower end of the piston and the outer pad is supported on the jaw, and the inner pad and the outer pad are both slidably engaged with the mounting bracket 200.
The service braking process of the brake is as follows:
the mounting bracket 200 is fixed to the knuckle, and the caliper body 101 is mounted to the mounting bracket 200 through a guide pin 241 and is axially slidable along the guide pin 241.
The rubber shock-proof sleeve is assembled outside the guide pin 241, so that the shock-proof and noise-proof effects are achieved. A piston is arranged in the caliper body 101, and when the caliper body 101 is braked in a running mode, the outside of the caliper body 101 is connected with an external brake hydraulic pipeline through an oil inlet; the interior and the piston form a brake hydraulic space, and a rectangular sealing ring 121 and a circular sealing ring 121 are arranged to prevent brake fluid from leaking. After the external brake fluid enters the cylinder body through the oil inlet hole, the braking pressure is built on the piston and the caliper body 101, and the brake fluid and the piston and the caliper body move away from each other. The piston presses the inner pad to approach the brake disc 111, and the hook head of the caliper body 101 presses the outer pad to move in the same way as the brake disc 111. With the enhancement of the brake hydraulic pressure, the brake clearance is eliminated, the function of the inner friction block and the outer friction block for extruding the brake disc 111 is generated, and the service braking action is formed.
The parking brake works as follows:
after the parking signal is sent, an external motor drives the screw 301 to rotate, and the rotation mode is converted into a translation motion mode through a circulating ball screw rod transmission pair between the screw 301 and the screw sleeve, so that the action of pushing the extrusion piston is generated. Meanwhile, the screw 301 is subjected to a reaction force to extrude the top bearing 501 of the caliper body 101 so as to push the hook head of the caliper body 101 to extrude the outer friction block. The inner and outer pads press the brake disc 111 under the above-mentioned motion to produce a parking brake effect. After parking braking is finished, the motor rotates reversely, the acting force of the nut sleeve 601 on the piston is removed, and the piston returns to the initial position under the action of deformation and recovery of the sealing ring 121. The external motor is connected with the screw 301 in a matching way through the spline groove 231.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. Electronic parking brake control system for motor vehicle, including EPB electronic control unit (1) and on-vehicle electronic control unit (2), its characterized in that: the EPB electronic control unit (1) is connected with the vehicle-mounted electronic control unit (2) through a CAN bus (3), and further comprises an EPB switch module (4), the EPB switch module is connected with the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2), the EPB electronic control unit (1) is in control connection with a first electronic caliper executing mechanism (5), and the vehicle-mounted electronic control unit (2) is in control connection with a second electronic caliper executing mechanism (6); the vehicle-mounted electronic control system further comprises a signal output module (7), the signal output module (7) is connected with the EPB electronic control unit (1), the EPB electronic control unit (1) receives signals of the signal output module (7) to judge the current state of the vehicle, and the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) control the first electronic caliper executing mechanism (5) or/and the second electronic caliper executing mechanism (6) according to the signals transmitted by the EPB switch module (4) and the signals output by the signal output module (7).
2. The electronic parking brake control system for a motor vehicle according to claim 1, characterized in that: the EPB switch module (4) comprises an EPB touch switch module (8) and an EPB key switch module (9), and the EPB touch switch module (8), the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) are connected and transmit signals to the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2); the EPB key switch module (9) is connected with the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) and transmits signals to the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2).
3. The electronic parking brake control system for a motor vehicle according to claim 2, characterized in that: the vehicle-mounted electronic control unit (2) and the EPB electronic control unit (1) both comprise signal detection circuits for identifying EPB signal modules, the vehicle-mounted electronic control unit (2) and the EPB electronic control unit (1) both comprise signal detection circuits for an EPB touch switch module (8) and an EPB key switch module (9), the EPB touch switch module (8) signal detection circuits of the vehicle-mounted electronic control unit (2) and the EPB electronic control unit (1) are both connected with the EPB touch switch module (8), and the EPB key signal detection circuits of the vehicle-mounted electronic control unit (2) and the EPB electronic control unit (1) are both connected with the EPB key switch module (9).
4. The electronic parking brake control system for a motor vehicle according to claim 1, characterized in that: the signal output module (7) comprises one or more of an accelerator pedal signal module (21), an ignition switch signal module (13), a brake pedal signal module (50), a P gear signal module (14) and a P handle position signal module (15), and the EPB electronic control unit (1) comprises detection circuits in one-to-one correspondence with the signal modules.
5. The electronic parking brake control system for a motor vehicle according to claim 1, characterized in that: the EPB electronic control unit (1) comprises a signal detection circuit for detecting a signal of the signal output module (7), and when the signal detection circuit of the EPB electronic control unit (1) cannot normally detect that the corresponding signal output module (7) sends a signal, and the EPB switch module (4) sends a parking/releasing or emergency braking instruction, the system does not execute or degrade the execution of an electronic caliper execution mechanism connected with the EPB electronic control unit (1).
6. The electronic parking brake control system for a motor vehicle according to claim 1, characterized in that: other on-board electronic control units are used instead of the EPB electronic control unit (1).
7. The electronic parking brake control system for a motor vehicle according to claim 1, characterized in that: the first electronic caliper executing mechanism (5) or/and the second electronic caliper executing mechanism (6) is/are a novel parking brake; the parking brake comprises a caliper body (101), wherein a brake area (201) is formed on the lower side of the caliper body (101); the method is characterized in that: the clamp comprises a clamp body (101), a screw rod (301) is installed in the clamp body (101), the screw rod (301) is connected with the clamp body (101) through a bearing (501), the outer portion of the screw rod (301) is assembled with a nut sleeve (601), a ball (701) is arranged between the screw rod (301) and the nut sleeve (601), a guide pipe (801) is installed on the nut sleeve (601), the guide pipe (801) and a spiral guide groove (901) of the screw rod (301) and the spiral guide groove (901) of the nut sleeve (601) form a circulating track (161) of the ball (701), the clamp further comprises a piston sleeve (100), the screw rod (301), the nut sleeve (601) and the guide pipe (801) are installed in the piston sleeve (100), the screw rod (301) rotates to drive the nut sleeve (601) to move linearly, and the nut sleeve (601) can drive the piston sleeve (100); the piston sleeve (100) and the outer wall of the piston sleeve are sleeved with a sealing ring (121) in an interference fit mode, a limiting groove (131) for limiting the outer ring of the sealing ring (121) is formed in the inner wall of the clamp body (101), when the piston moves downwards under the thrust of the nut sleeve (601) to the braking area (201), the sealing ring (121) deforms, and when the nut sleeve (601) removes the external force on the piston, the sealing ring (121) deforms and recovers and meanwhile drives the piston to return; the guide pipe fixing device is characterized by further comprising a fixing plate (141), insertion holes (151) are formed in the outer side face of the nut sleeve (601), the insertion holes (151) are arranged in pairs, two ends of the guide pipe (801) are inserted into the insertion holes (151), the insertion holes (151) are communicated with a circulating track (161) formed by a spiral guide groove (901) of the screw rod (301) and a spiral guide groove (901) of the nut sleeve (601), the fixing plate (141) is clamped on the outer wall of the guide pipe (801) to fix the guide pipe (801) on the nut sleeve (601), and the fixing plate (141) is fixedly connected with the nut sleeve (601) through mounting bolts.
8. A control method of an electronic parking brake control system for a motor vehicle, characterized in that: the electronic parking brake control system for the automobile including any one of claims 1 to 5, the control method thereof including the steps of:
s1, when a person operates the EPB switch module (4), the EPB switch module (4) sends a parking/releasing or emergency braking instruction to the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) at the same time, and the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) detect whether signals are received normally or not, wherein the signals comprise a normal working state and an abnormal working state;
s2, a signal detection circuit of the EPB electronic control unit (1) detects whether the signal of the signal output module (7) is normally received or not, and normal operation and abnormal operation are not included;
s3, if the S1 and the S2 both work normally, the EPB electronic control unit (1) controls the first electronic caliper executing mechanism (5) to execute a parking/releasing or emergency braking instruction, and the vehicle-mounted electronic control unit (2) controls the second electronic caliper executing mechanism (6) to execute the parking/releasing or emergency braking instruction;
s4, if the step S1 works normally and the step S2EPB electronic control unit (1) works abnormally, the first electronic caliper executing mechanism (5) does not execute a parking/releasing or emergency braking instruction or degrade to execute the parking/releasing or emergency braking instruction, and the vehicle-mounted electronic control unit (2) controls the second electronic caliper executing mechanism (6) to execute the parking/releasing or emergency braking instruction;
s5, if the circuit for detecting the EPB switch module (4) signal by the EPB electronic control unit (1) in the step S1 normally receives the signal for detecting the EPB switch module (4), the circuit for detecting the EPB switch module (4) signal by the vehicle-mounted electronic control unit (2) cannot normally receive the signal for detecting the EPB switch module (4), and the EPB electronic control unit (1) works normally in the step S2, the EPB electronic control unit (1) controls the first caliper executing mechanism to execute the parking/releasing or emergency braking command.
9. The control method of an electronic parking brake control system for a motor vehicle according to claim 8, characterized in that: the signal output module (7) comprises a P gear signal module (14) and/or a P handle signal module (15), the EPB electronic control unit (1) comprises a P gear signal detection circuit (18) corresponding to the P gear signal module (14) or/and a P handle signal detection circuit (19) corresponding to the P handle signal module (15), and when the CAN bus signal detection circuit (22) of the EPB electronic control unit (1), the P gear signal module (14) and/or the P handle signal module (15) detect one or two of a P handle signal or a P gear signal, or the CAN bus (3) detects one or two of a P handle signal or a P gear signal, the EPB electronic control unit (1) and the vehicle-mounted electronic control unit (2) execute a parking/releasing instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011193535.7A CN112265531A (en) | 2020-10-30 | 2020-10-30 | Electronic parking brake control system and control method for motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011193535.7A CN112265531A (en) | 2020-10-30 | 2020-10-30 | Electronic parking brake control system and control method for motor vehicle |
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| Publication Number | Publication Date |
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| CN112265531A true CN112265531A (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011193535.7A Pending CN112265531A (en) | 2020-10-30 | 2020-10-30 | Electronic parking brake control system and control method for motor vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465239A (en) * | 2022-08-24 | 2022-12-13 | 瀚德万安(上海)电控制动系统有限公司 | vehicle brake |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376242A (en) * | 1998-11-17 | 2002-10-23 | Skf工程研究中心公司 | Screw actuator comprising a multi-purpose sleeve, and brake calliper |
| US20020185340A1 (en) * | 2001-06-07 | 2002-12-12 | Seiichi Kojima | Electronic controlled brake device |
| CN107757593A (en) * | 2017-09-22 | 2018-03-06 | 芜湖伯特利汽车安全系统股份有限公司 | A kind of electronic parking control system and its control method with redundancy parking function |
| CN110203189A (en) * | 2019-05-05 | 2019-09-06 | 万向钱潮股份有限公司 | A kind of electrically driven (operated) commercial vehicle electronic parking system |
| CN214325076U (en) * | 2020-10-30 | 2021-10-01 | 浙江万安科技股份有限公司 | Electronic parking brake control system for motor vehicle |
-
2020
- 2020-10-30 CN CN202011193535.7A patent/CN112265531A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376242A (en) * | 1998-11-17 | 2002-10-23 | Skf工程研究中心公司 | Screw actuator comprising a multi-purpose sleeve, and brake calliper |
| US20020185340A1 (en) * | 2001-06-07 | 2002-12-12 | Seiichi Kojima | Electronic controlled brake device |
| CN107757593A (en) * | 2017-09-22 | 2018-03-06 | 芜湖伯特利汽车安全系统股份有限公司 | A kind of electronic parking control system and its control method with redundancy parking function |
| CN110203189A (en) * | 2019-05-05 | 2019-09-06 | 万向钱潮股份有限公司 | A kind of electrically driven (operated) commercial vehicle electronic parking system |
| CN214325076U (en) * | 2020-10-30 | 2021-10-01 | 浙江万安科技股份有限公司 | Electronic parking brake control system for motor vehicle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465239A (en) * | 2022-08-24 | 2022-12-13 | 瀚德万安(上海)电控制动系统有限公司 | vehicle brake |
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Application publication date: 20210126 |