CN110712637A

CN110712637A - Integrated electric control device of wire-controlled intelligent braking system

Info

Publication number: CN110712637A
Application number: CN201911011471.1A
Authority: CN
Inventors: 郭中阳; 孙明海; 庞纪苏; 刘佰申; 宋娟娟
Original assignee: Zhejiang Libang Hexin Intelligent Brake System Co Ltd
Current assignee: Zhejiang Libang Hexin Intelligent Brake System Co Ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-01-21

Abstract

The invention discloses an integrated electric control device of a line control intelligent braking system, which is characterized by comprising the following components: the brake power assisting device comprises a controller MCU, a power management module, a brake power assisting module and an EPB module, wherein the brake power assisting module and the EPB module are managed and controlled by the controller MCU and the power management module, and the brake power assisting module and the EPB module share one set of CAN bus transceiver to transmit signals. According to the invention, a chip controller is reduced, a set of power management chips is reduced, the hardware cost of system composition is reduced, the development working hours of a software platform are reduced and optimized, the probability of dead zones of software design verification test cases is reduced, and the design freedom is improved for the overall arrangement of the design of the unmanned vehicle; the control information of the brake boosting system and the control information of the parking brake system are interactively fused in the same ECU, and the signal chain transmission speed and the reliability are high.

Description

Integrated electric control device of wire-controlled intelligent braking system

Technical Field

The invention relates to an intelligent brake electric control system, in particular to an integrated electric control device of a line control intelligent brake system.

Background

At present, the automobile industry enters a great technical revolution period, and the development of intelligent automobiles is integrally planned from the top level design aspect by the country from the strategic height, the resource concentration and the strength increase, so that the development of intelligent networked automobiles is accelerated and promoted. Under the action of the requirement of the automobile for conversion to the four-transformation, the requirement of a chassis brake-by-wire system is also increased dramatically. Meanwhile, in order to meet the international functional safety development standard, the highest-level requirement ASIL-D is realized for the safety level development of the main control chip by a plurality of manufacturers. The risk of safety hazards increases drastically if the electronic system of the brake-by-wire of a car should fail, so that a higher level of safety performance is required at the same time as a highly complex control is necessary.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an integrated electric control device of a brake-by-wire intelligent braking system, wherein an electric control ECU (electronic control Unit) of a brake boosting system and an electric control ECU of an electronic parking braking system are integrated into a whole, and the functions of conventional brake-by-wire and parking braking are realized by a single integrated ECU.

In order to achieve the purpose, the invention is realized by the following technical scheme: the integrated electric control device of the line control intelligent braking system is characterized by comprising: the brake power assisting device comprises a controller MCU, a power management module, a brake power assisting module and an EPB module, wherein the brake power assisting module and the EPB module are managed and controlled by the controller MCU and the power management module, and the brake power assisting module and the EPB module share one set of CAN bus transceiver to transmit signals.

In the task time sequence of the controller MCU, the task request priority of the brake power assisting module is higher than that of the EPB module. The braking assisting module lags behind one beat in a reference time sequence to realize the execution of braking control by a task interruption request, and meanwhile, the EPB module is in a task interruption request locking state. The braking assisting module has a higher priority because the braking assisting module has a request for executing a braking task at any time during the running process of the vehicle, and the request for executing the tasks of the EPB module is generally started when the running of the vehicle is finished and has a lower priority relatively.

The brake power assisting module comprises a power assisting motor, a rotor position sensor and a three-phase PMSM pre-driving circuit, the power assisting motor is connected with an MCU through the three-phase PMSM pre-driving circuit, the rotor position sensor is used for detecting the state of the power assisting motor and feeding the state back to the MCU, the EPB module comprises a left caliper motor, a right caliper motor and an H-bridge pre-driving circuit, and the left caliper motor and the right caliper motor are connected with the MCU through the H-bridge pre-driving circuit.

The controller MCU adopts ROM/1MB, RAM/128K, and 120MHz main frequency chip.

According to the invention, a chip controller is reduced, a set of power management chips is reduced, the hardware cost of system composition is reduced, the development working hours of a software platform are reduced and optimized, the probability of dead zones of software design verification test cases is reduced, and the design freedom is improved for the overall arrangement of the design of the unmanned vehicle; the control information of the brake boosting system and the control information of the parking brake system are interactively fused in the same ECU, and the signal chain transmission speed and the reliability are high.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

FIG. 2 is an allocation diagram of interrupt request timing for brake task execution.

Detailed Description

As shown in fig. 1, the integrated control device of the intelligent brake-by-wire system includes: the brake booster module 300 and the EPB module 400 are managed and controlled by the controller MCU 100 and the power management module 200, and the brake booster module 300 and the EPB module 400 share one set of CAN bus transceiver 500 to transmit signals.

The data bus CAN receives a control strategy implementation request signal of the brake power-assisted system from the whole vehicle electric control unit, and simultaneously transmits a state control and fault safety monitoring signal of the electronic parking brake system.

As shown in fig. 2, in the task timing sequence of the controller MCU, the task request priority of the brake booster module is higher than that of the EPB module, the task interrupt request priority of the brake booster module is 1 times higher, and the task interrupt request priority of the EPB module is 2 times lower or 4 times lower. After the ECU is initialized, the brake power assisting module lags behind one beat in a reference time sequence to realize the execution of brake control of the task interruption request, and meanwhile, the EPB module is in a task interruption request locking state. The braking assisting module has a higher priority because the braking assisting module has a request for executing a braking task at any time during the running process of the vehicle, and the request for executing the tasks of the EPB module is generally started when the running of the vehicle is finished and has a lower priority relatively.

In the aspect of resource consumption, on the basis of examining actual project products, ROM/1MB, RAM/128K, and a chip with 120MHz of main frequency are selected to be enough to meet the requirement of integrating integrated functions. The brake-assisted electric control system is in a normal working state, the EPB starts to work when the automobile enters a parking state, and even if dynamic parking is needed, under the general condition that high-frequency tasks of the system are interrupted and time-sharing is carried out, control strategies for realizing different functions have no conflict and chip resources are not consumed at the same time. Due to the strong computing capability and high-speed main frequency of the chip, the required functions are realized in the design of the control strategy to ensure redundancy, and the situation that time-sharing resources are insufficient when interrupted does not exist.

The brake power assisting module 300 comprises a power assisting motor 301, a rotor position sensor 302 and a three-phase PMSM pre-driving circuit 303, wherein the power assisting motor 301 is a permanent magnet synchronous motor and is connected with an MCU through the three-phase PMSM pre-driving circuit 303, the rotor position sensor is used for detecting the state of the power assisting motor and feeding back the state to the MCU, the EPB module 400 comprises a left caliper motor 401, a right caliper motor 402 and an H-bridge pre-driving circuit 403, and the left caliper motor 401 and the right caliper motor 402 are both connected with the MCU through the H-bridge pre-driving circuit 403.

When the state safety mechanisms of both the brake boosting system and the electronic parking brake system are effective, the relevant brake requests are implemented respectively. If one part fails, the system gives an alarm, and the other part takes over the implementation of the emergency braking request to ensure the safety of the system, thereby realizing the reasonable association check of the two parts and effectively realizing the redundancy of the braking function.

Claims

1. The integrated electric control device of the line control intelligent braking system is characterized by comprising: the brake power assisting device comprises a controller MCU, a power management module, a brake power assisting module and an EPB module, wherein the brake power assisting module and the EPB module are managed and controlled by the controller MCU and the power management module, and the brake power assisting module and the EPB module share one set of CAN bus transceiver to transmit signals.

2. The integrated control device of the intelligent brake-by-wire system according to claim 1, wherein the task request priority of the brake boosting module is higher than that of the EPB module in the task timing of the controller MCU.

3. The integrated control device of the intelligent brake-by-wire system according to claim 2, wherein the brake boosting module delays a beat in a reference timing sequence to implement the task interruption request execution brake control, and the EPB module is in a task interruption request locking state.

4. The integrated control device of the intelligent brake-by-wire system according to claim 1, wherein the brake booster module comprises a booster motor, a rotor position sensor and a three-phase PMSM pre-drive circuit, the booster motor is connected with the MCU through the three-phase PMSM pre-drive circuit, the rotor position sensor is used for detecting the state of the booster motor and feeding back the state to the MCU, the EPB module comprises a left caliper motor, a right caliper motor and an H-bridge pre-drive circuit, and the left caliper motor and the right caliper motor are both connected with the MCU through the H-bridge pre-drive circuit.

5. The integrated control device of the intelligent brake-by-wire system according to any one of claims 1 to 4, wherein the controller MCU is a chip with ROM/1MB, RAM/128K, and master frequency of 120 MHz.