CN214607478U

CN214607478U - Stay-supported EPB control system

Info

Publication number: CN214607478U
Application number: CN202120240499.9U
Authority: CN
Inventors: 章国栋; 杨梁; 祝庆
Original assignee: Kuntye Vehicle System Changzhou Co Ltd
Current assignee: Kuntai Vehicle System Changzhou Co ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-11-05
Anticipated expiration: 2031-01-28

Abstract

The utility model discloses a stay-supported EPB control system, which comprises a motor module, a power supply module and an MCU module, wherein the motor module is used for tensioning or releasing a parking steel cable; the power supply module is used for supplying power to the whole system; the MCU module comprises an MCU1 and an MCU2, the MCU1 is a master control module, the MCU2 is a slave control module, and SPI communication is adopted between the MCU1 and the MCU 2. The utility model provides a stay-supported EPB control system has solved the defect that traditional stay-supported EPB control system can't satisfy the functional safety demand, the utility model discloses can reach functional safety level ASILD, reduce the emergence of casualties and road traffic accident of personnel, still solve traditional stay-supported EPB control system simultaneously and can't carry out emergency braking's function, guarantee to accomplish emergency braking under the malfunctioning condition of ESP.

Description

Stay-supported EPB control system

Technical Field

The utility model relates to a stay-supported EPB control system belongs to electron parking braking field.

Background

At present, with the rapid development of the automobile industry, more advanced technologies are introduced into the automobile control system, and meanwhile, the requirements on electronic products are higher and higher, especially the requirements on the functional safety of automobile safety parts are higher and higher. However, the conventional pull-cord type EPB control system only has the functions of hand brake, static parking and static release, and does not have the emergency brake function, and meanwhile, the conventional pull-cord type EPB control system also does not have the related design in the aspect of functional safety.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that, overcome prior art not enough, provide a stay-supported EPB control system, solved the defect that traditional stay-supported EPB control system can't satisfy the functional safety demand, the utility model discloses can reach functional safety class ASILD, reduce the casualties of personnel and the emergence of road traffic accident, still solve traditional stay-supported EPB control system simultaneously and can't carry out emergency braking's function, guarantee to accomplish emergency braking under the malfunctioning condition of ESP.

In order to solve the technical problem, the technical scheme of the utility model is that:

a pull-line EPB control system comprising:

a motor module for tightening or releasing a parking cable;

the power supply module is used for supplying power to the whole system;

the MCU module comprises an MCU1 and an MCU2, the MCU1 is a master control module, the MCU2 is a slave control module, and the MCU1 and the MCU2 adopt SPI communication;

the CAN communication module is provided with two paths, and the two paths of CAN communication modules are used for the communication between the MCU module and the ECU, EMS and TCU of the whole vehicle;

the power management module is provided with two paths, and the two paths of power management modules are used for respectively and independently supplying power to the master control circuit and the slave control circuit;

the motor driving module is used for driving a motor to rotate, the motor driving module comprises a main driving loop and a slave driving loop, and when the main driving loop fails, the slave driving loop is started;

the torque sensor module is used for detecting the tension value of the steel cable and respectively transmitting the tension value to the MCU1 and the MCU 2;

and the switch detection module is used for detecting a parking or release signal of the parking switch and respectively sending the parking or release signal to the MCU1 and the MCU 2.

And the control system further comprises a power source reverse connection protection module, wherein the power source reverse connection protection module is used for preventing the whole control system from being burnt out after the power source is reversely connected.

Further, the power module is a battery.

According to the above technical scheme, the utility model discloses increased on original stay-supported EPB control system's the basis that from the accuse system satisfied the requirement in the aspect of the functional safety, improved because of the stay-supported EPB control system functional failure to driver or passenger's factor of safety, avoided the emergence of unnecessary traffic accident, increased emergency control strategy on original stay-supported EPB control system basis, promoted whole parking control system's security greatly. Meanwhile, the integrated chip is adopted in the design of the driving circuit, so that the area of the PCB is reduced, and the cost of the product is reduced.

Drawings

Fig. 1 is a schematic block diagram of a pull-cord EPB control system according to the present invention;

fig. 2 is a schematic circuit diagram of the motor driving module of the present invention.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

As shown in fig. 1, a stay-supported EPB control system includes: the device comprises a motor module, a power supply module, a CAN communication module, a power supply management module, a motor driving module, a torque sensor module and a switch detection module.

The motor module is used for pulling in or releasing the parking cable.

The power module is used for providing power for the whole system and is a battery.

The MCU module, the MCU module includes MCU1 and MCU2, MCU1 is master control module, MCU1 model is FS32K146UIT0VLLT, the MCU2 model is SPC560P50L3, MCU2 is for following accuse module, adopt SPI communication between MCU1 and the MCU2, certain control circuit failure has been realized, realize the purpose of switching fast, MCU1 and MCU2 satisfy function safety class ASILB simultaneously. When the master control chip MCU1 fails, the other slave control chip MCU2 can still take over the work; and when a single circuit of the master control area or the slave control area fails, the system can still realize 100 percent parking and parking. The motor driving circuit is single failure, and the parking and parking requirements of 8% gradient can be still met.

The CAN communication module is provided with two paths, the two paths of CAN communication modules are used for communication between the MCU module and an ECU, an EMS, a TCU and the like of the whole vehicle, when one loop of the two communication loops fails, the other loop CAN still realize the communication function, software upgrading is realized by the module and only needs to be downloaded once, synchronous updating of double control CAN be realized, only one access instruction is needed for maintenance and diagnosis, and main control and slave control diagnosis data information is synchronously read. The power management module is provided with two paths, and the two paths of power management modules are used for respectively and independently supplying power to the master control circuit and the slave control circuit, so that the power failure of a certain control loop is realized, and the requirement of the system function is not influenced. The CAN communication and power management module is integrated in the same IC, and whether emergency braking is needed currently or not is judged by monitoring the whole vehicle signal through CAN communication and is executed. The ECU is an electronic control unit, the EMS is an engine management system, and the TCU is a gearbox control unit.

The motor driving module is used for driving the motor to rotate, the motor driving module comprises a main driving loop and a slave driving loop, and when the main driving loop fails, the slave driving loop is started. The main drive circuit and the auxiliary drive circuit are both H-bridges and comprise motor pre-drive and MOS (metal oxide semiconductor) tube parts which are integrated together, so that the area of the PCB occupied by components is reduced on one hand, and the production cost of the PCB is reduced on the other hand.

The torsion sensor is used for detecting the tension value of the steel cable, the tension value is respectively transmitted to the MCU1 and the MCU2 by the torsion sensor, and the current braking force of the braking system is judged according to the tension value of the steel cable.

The switch detection module is used for detecting a parking or release signal of the parking switch and respectively sending the parking or release signal to the MCU1 and the MCU 2.

As shown in fig. 1, the power supply reverse connection protection module is included and is used for preventing the whole control system from being burnt out after the power supply is reversely connected. The power supply reverse connection prevention module is realized by using one MOS tube, has the advantages of low voltage, low power consumption, high power and the like, and avoids burning out the whole controller after the power supply is reversely connected.

As shown in fig. 2, an H-bridge portion of a motor driving circuit is shown, the H-bridge portion includes Predriver and four MOS transistors, the Predriver drives a caliper portion of an actuator to clamp and release, and a circuit portion of a field effect transistor IPD90P03P4L-04 in the drawing realizes a power reverse connection protection function in a system.

The control system works: according to the technical scheme, the parking switch is pressed, the MCU module detects a parking signal, the motor in the EPB controller is driven to move (the motor rotates forwards) at the moment, the steel cable is tensioned, the MCU module detects the value of the torque sensor at the same time, the motor stops when the steel cable is tensioned to a certain degree, and the EPB controller is self-locked by the mechanical structure of the EPB controller.

And when the release switch is pressed down, the MCU module detects a release signal, drives a motor in the EPB controller to move (the motor rotates reversely) at the moment, releases the steel cable, detects the value of the torque sensor at the same time, and stops when the steel cable is released to a certain degree.

The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A pull-line EPB control system, comprising:

a motor module for tightening or releasing a parking cable;

the power supply module is used for supplying power to the whole system;

2. A pull-line EPB control system according to claim 1, wherein: the control system comprises a power source reverse connection protection module, wherein the power source reverse connection protection module is used for preventing the whole control system from being burnt out after the power source is reversely connected.

3. A pull-line EPB control system according to claim 1, wherein: the power module is a battery.