CN216734246U

CN216734246U - Double-control redundant brake-by-wire system

Info

Publication number: CN216734246U
Application number: CN202220442976.4U
Authority: CN
Inventors: 祝涛; 王洪良; 石晓东; 李彬; 张凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-06-14
Anticipated expiration: 2032-03-02

Abstract

A dual-control redundant brake-by-wire system belongs to the field of automobiles and aims to solve the problems of speed reduction and parking through electronic braking under the condition of no air pressure or hydraulic pressure and guarantee the safety of the system. The device also comprises a left front wheel speed sensor unit, a right front wheel speed sensor unit, a left rear wheel speed sensor unit, a right rear wheel speed sensor unit and a steering wheel rotation angle sensor unit. The electromechanical braking system adopts full-line control, and has the advantages of short braking response time, quick brake clearance elimination, high space utilization rate, simple structure, simple system structure, few parts and convenient maintenance.

Description

Double-control redundant brake-by-wire system

Technical Field

The utility model relates to the field of automobiles, in particular to a dual-control redundant brake-by-wire system.

Background

Along with the acceleration of the modernization process of China, the automobile industry is promoted unprecedentedly, and the safety degree of the transportation industry is more and more concerned by people. The function and structure of the brake system, which is a key system for ensuring the safe driving of the vehicle, are continuously improved and perfected.

The traditional automobile brake is that a brake caliper piston is pushed by air pressure or hydraulic pressure to drive a friction plate to clamp a brake disc for friction, and finally the deceleration parking is realized.

The whole vehicle with a complex structure of the traditional braking system needs to arrange a large number of pipelines and other parts such as valve bodies, and is complex in structure, multiple in parts and inconvenient to maintain.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides a dual-control redundant brake-by-wire system, which can solve the problems that the traditional brake system has a complex structure, the whole vehicle needs to be provided with a large number of pipelines and other parts such as valve bodies, the structure is complex, the parts are multiple, and the maintenance is inconvenient, and the system can be decelerated and stopped by electronic braking under the condition of no air pressure or hydraulic pressure, and the safety of the system is ensured by a redundant control mode.

The technical scheme adopted by the utility model is as follows:

a dual-control redundant brake-by-wire system comprises a left front brake unit, a right front brake unit, a left rear brake unit, a right rear brake unit, a first power supply unit, a second power supply unit, a first ECU unit, a second ECU unit, a brake pedal unit and an EPB switch unit;

the brake pedal unit and the EPB switch unit are respectively connected with the first ECU unit and the second ECU unit in sequence, the first power supply unit is connected with the first ECU unit, the second power supply unit is connected with the second ECU unit, the first ECU unit is respectively connected with the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit, and the second ECU unit is respectively connected with the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit.

Further, the vehicle brake system further comprises an EPB controller unit which is connected with the connection ends of the brake pedal unit and the EPB switch unit, the second power supply unit, the left rear brake unit and the right rear brake unit, respectively.

Further, the device also comprises a left front wheel speed sensor unit, a right front wheel speed sensor unit, a left rear wheel speed sensor unit and a right rear wheel speed sensor unit;

the left front wheel speed sensor unit, the right front wheel speed sensor unit, the left rear wheel speed sensor unit and the right rear wheel speed sensor unit are respectively connected with the first ECU unit;

and the left front wheel speed sensor unit, the right front wheel speed sensor unit, the left rear wheel speed sensor unit and the right rear wheel speed sensor unit are respectively connected with the second ECU unit.

Further, the steering wheel angle control system further comprises a steering wheel angle sensor unit, and the steering wheel angle sensor unit is connected with the first ECU unit.

Further, the vehicle steering wheel further comprises a CAN bus, and the steering wheel corner sensor unit, the left front wheel speed sensor unit, the right front wheel speed sensor unit, the left rear wheel speed sensor unit, the right rear wheel speed sensor unit, the first ECU unit and the second ECU unit are connected through the CAN bus.

The utility model has the beneficial effects that:

1. a large number of pipes and valve bodies need not be arranged.

2. The system has simple structure, few parts and convenient maintenance.

3. The system can ensure that the vehicle is decelerated and stopped through electronic braking under the condition of no air pressure or hydraulic pressure, and the safety of the system is ensured through a redundancy control mode.

4. The electromechanical brake system adopts full-line control, and has the advantages of fast brake response time, fast brake clearance elimination, high space utilization rate and simple structure.

Drawings

FIG. 1 is a functional block diagram of a dual redundant brake-by-wire system;

FIG. 2 is a functional block diagram of ABS, EBD, VDC, TCS, HDC, HHC, AVH, CRBS, RMI, HAZ, CDP, BDW, AEB, ACC of a dual redundant brake-by-wire system;

Detailed Description

As shown in fig. 1, the present embodiment includes a left front brake unit, a right front brake unit, left and right rear brake units, a first power supply unit, a second power supply unit, first and second ECU units, a brake pedal unit, an EPB switch unit;

The EPB controller unit is respectively connected with the connecting ends of the brake pedal unit and the EPB switch unit, the second power supply, the left rear brake unit and the right rear brake unit.

The first ECU unit: the braking force required by the driver is calculated according to the pedal opening, the change of the pedal opening in unit time and the current vehicle speed, and parking is carried out according to a signal of the EPB switch unit.

The second ECU unit: and the controller is used as a redundant ECU controller for calculating the braking force required by the driver according to the pedal opening, the change of the pedal opening in unit time and the current vehicle speed and parking according to the signal of the EPB switch unit.

The EPB controller unit: the system is used as a redundant control system, and is used for monitoring faults of the first ECU and the second ECU at the same time, monitoring the first ECU and the second ECU, and performing emergency braking and parking at any moment when the first ECU and the second ECU are in fault.

And the EPB switch unit sends signals to the first ECU unit and the second ECU unit to enter a dynamic parking function.

The first ECU unit calculates the deceleration required by the driver according to the opening degree of the brake pedal, the angle change speed of the brake pedal in unit time and the current vehicle speed, and then controls the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit to carry out deceleration braking; the driver presses the EPB switch unit, and the first ECU unit sets the parking braking force of the front left brake unit, the front right brake unit, the rear left brake unit and the rear right brake unit according to the current gradient of the vehicle.

When the first ECU unit has a problem or the first power supply unit has a problem, the second ECU unit takes over the brake system, the second ECU unit is connected with the second power supply unit, the second ECU unit and the first ECU unit are controllers with completely the same function, and the second ECU unit is used as redundancy backup hardware: the second ECU unit calculates the deceleration required by the driver according to the opening degree of the brake pedal, the angle change of the brake pedal in unit time and the current vehicle speed, and then controls the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit to carry out deceleration braking; the driver presses the EPB parking switch unit, and the second ECU unit sets the parking braking force of the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit according to the current gradient of the vehicle.

The EPB controller unit is connected with the second power supply unit, the EPB controller unit is connected with the left rear brake unit and the right rear brake unit through independent hard wires, the EPB controller monitors and checks states of the first ECU unit and the second ECU unit, and when the first ECU unit or the first power supply unit breaks down and the second ECU unit also breaks down, the EPB controller unit can independently control the left rear brake unit and the right rear brake unit to perform emergency braking and parking functions.

As shown in fig. 2, the first ECU unit includes an ABS anti-lock function, an EBD electronic brake force distribution function, and a VDC vehicle stability control function in addition to the regular deceleration braking. The system comprises a TCS traction control function, an HDC steep descent control function, an HHC hill start auxiliary function, an AVH parking automatic keeping function, a CRBS coordinated electric power regenerative braking function, an RMI electronic rollover prevention function, an HAZ danger warning function, a CDP dynamic parking control function, a BDW brake disc wiping function, an AEB active braking function and an ACC self-adaptive cruise function which are matched with ADAS advanced auxiliary driving and the like.

The ABS function is used for automatically controlling the braking force of the brake when the automobile brakes, so that wheels are not locked and are in a rolling and sliding state, and the adhesion between the wheels and the ground is ensured to be at the maximum value. The EBD electronic braking force distribution function is used for balancing the effective grip force of each tire on the basis of the ABS, improving the braking balance and shortening the braking distance.

On the basis of the hardware constitution of the existing scheme, the device also comprises a left front wheel speed sensor unit, a right front wheel speed sensor unit, a left rear wheel speed sensor unit and a right rear wheel speed sensor unit. The first ECU unit and the second ECU unit are connected with the system in a CAN bus connection mode, for example, through a CAN bus technology.

The left front wheel speed sensor unit, the right front wheel speed sensor unit, the left rear wheel speed sensor unit and the right rear wheel speed sensor unit are used for collecting the rotating speed of the corresponding wheel.

And the CAN bus is used for realizing information transmission among all units in the automobile. The method comprises the steps that a driver steps on a brake pedal, signals of a brake pedal unit, signals of a left front wheel speed sensor unit, signals of a right front wheel speed sensor unit, signals of a left rear wheel speed sensor unit and signals of a right rear wheel speed sensor unit are transmitted to a first ECU, the first ECU processes the signals, controls the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit, and achieves ABS anti-lock and EBD electronic braking force distribution functions.

The VDC vehicle dynamic control system can actively control the dynamic performance of the vehicle, and the VDC system can timely utilize the functions of ABS and TCS to intervene in controlling the body posture of the vehicle during running.

On the basis of the existing system hardware, a steering wheel corner sensor unit is added, and the connection modes comprise a CAN bus and the like. And the steering wheel corner sensor unit is used for acquiring corner angle information of the steering wheel.

The driver steps on the brake pedal, and transmits a brake pedal unit signal, a left front wheel speed sensor unit signal, a right front wheel speed sensor unit signal, a left rear wheel speed sensor unit signal, a right rear wheel speed sensor unit signal and a steering wheel corner sensor unit signal to the first ECU unit and the second ECU unit, the first ECU unit processes the signals, controls the left front brake unit, the right front brake unit, the left rear brake unit and the right rear brake unit, and achieves a VDC vehicle dynamic control function.

Claims

1. A dual-control redundant brake-by-wire system is characterized by comprising a left front brake unit, a right front brake unit, a left rear brake unit, a right rear brake unit, a first power supply unit, a second power supply unit, a first ECU unit, a second ECU unit, a brake pedal unit and an EPB switch unit;

2. The dual-control redundant brake-by-wire system according to claim 1, further comprising an EPB controller unit, the EPB controller unit being connected to the connection ends of the brake pedal unit and the EPB switch unit, the second power supply unit, the left rear brake unit, and the right rear brake unit, respectively.

3. The dual-control redundant brake-by-wire system according to claim 2, further comprising a left front wheel speed sensor unit, a right front wheel speed sensor unit, a left rear wheel speed sensor unit, a right rear wheel speed sensor unit;

4. The dual-control redundant brake-by-wire system according to claim 3, further comprising a steering wheel angle sensor unit, wherein the steering wheel angle sensor unit is connected to the first ECU unit.

5. The dual-control redundant brake-by-wire system according to claim 4, further comprising a CAN bus, wherein the steering wheel rotation angle sensor unit, the left front wheel speed sensor unit, the right front wheel speed sensor unit, the left rear wheel speed sensor unit, the right rear wheel speed sensor unit, and the first ECU unit and the second ECU unit are connected through the CAN bus.