CN115923758A - Braking system and vehicle - Google Patents

Abstract

The invention discloses a braking system and a vehicle, wherein a front axle braking module and a rear axle braking module in the system are both connected with an input module, and a communication connection is established between the front axle braking module and the rear axle braking module; the vehicle is powered on, the front axle brake module sends a front axle brake working signal to the rear axle brake module, the rear axle brake module sends a rear axle brake working signal to the front axle brake module, and the front axle brake module and the rear axle brake module are backup brake modules. When the received rear axle brake working signal is a fault signal, the front axle brake module replaces the rear axle brake module to control the rear axle brake of the vehicle, when the received front axle brake working signal is a fault signal, the rear axle brake module replaces the front axle brake module to control the front axle brake of the vehicle, the two brake modules are backup brake modules for each other, when one brake module breaks down, the effective vehicle brake can still be carried out according to the brake signal, the stability of a brake system is improved, and the safety of the vehicle is improved.

Description

Braking system and vehicle

Technical Field

The invention relates to the technical field of vehicle braking, in particular to a braking system and a vehicle.

Background

At present, with the development of technology, automobiles become important travel and transportation tools, users pay more and more attention to the safety of automobiles, a braking system plays a crucial role in the safety of automobiles, the current automobile braking system generally adopts a single braking mode, and when the braking mode breaks down, the automobiles can not be effectively braked, so that safety accidents are caused, and therefore how to improve the stability of the automobile braking system becomes a technical problem to be solved urgently.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a braking system and a vehicle, and aims to solve the technical problem that the braking safety of the vehicle is low due to poor stability of the conventional braking system.

To achieve the above object, the present invention provides a brake system applied to a vehicle, the brake system including: the brake device comprises an input module, a front axle brake module and a rear axle brake module, wherein the front axle brake module and the rear axle brake module are connected with the input module, and communication connection is established between the front axle brake module and the rear axle brake module; after the vehicle is powered on, the front axle brake module sends a front axle brake working signal to the rear axle brake module, the rear axle brake module sends a rear axle brake working signal to the front axle brake module, and the front axle brake module and the rear axle brake module are backup brake modules;

the input module is used for inputting brake signals to the front axle brake module and the rear axle brake module;

the front axle braking module is used for controlling a front axle and a rear axle of the vehicle to brake the whole vehicle according to the braking signal when the received rear axle braking working signal is a fault signal; and

and the rear axle braking module is used for controlling the rear axle and the front axle of the vehicle to brake the whole vehicle according to the braking signal when the received front axle braking working signal is a fault signal.

Optionally, the input module includes a pedal simulator, the front axle brake module includes a front brake control unit and an axle control unit, the rear axle brake module includes a drive/brake control unit, both the front brake control unit and the drive/brake control unit are in communication connection with the pedal simulator, both the front brake control unit and the drive/brake control unit are in communication connection with the axle control unit, both the front brake control unit and the drive/brake control unit are in communication connection, the front brake control unit sends a front axle brake working signal to the drive/brake control unit, and the drive/brake control unit sends a rear axle brake working signal to the front brake control unit;

the pedal simulator is used for sending a braking signal to the front braking control unit and the driving/braking control unit through communication connection;

the driving/braking control unit is used for determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal when the braking working signal of the front axle is a fault signal;

the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle and sending the braking force required by the front axle to the axle control unit;

and the bridge control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

Optionally, the front brake control unit is configured to determine a front axle required braking force and a rear axle required braking force according to the braking signal when the rear axle braking operation signal is a fault signal, and control the vehicle front axle to brake the entire vehicle according to the front axle required braking force;

and the front brake control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle.

Optionally, the driving/braking control unit is further configured to determine a braking type according to the braking signal when the front axle braking operation signal is a normal signal;

the driving/braking control unit is also used for determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal when the braking type is an emergency braking type;

the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle and sending the braking force required by the front axle to the front braking control unit;

and the front brake control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

Optionally, the driving/braking control unit is further configured to determine a total required braking force according to the braking signal when the front axle braking operation signal is a normal signal, and determine an energy recovery braking force according to power battery information and power motor information;

the driving/braking control unit is further used for determining a front axle required braking force and a rear axle required braking force according to the total required braking force and the energy recovery braking force and sending the front axle required braking force to the front braking control unit;

the driving/braking control unit is also used for carrying out energy recovery braking according to the energy recovery braking force and controlling the rear axle of the vehicle to carry out whole vehicle braking according to the rear axle braking force demand;

and the front brake control unit is also used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

Optionally, the driving/braking control unit is further configured to determine an additional required braking force according to the total required braking force and the energy recovery braking force, and determine whether the rear axle of the vehicle meets the stability requirement according to the additional required braking force;

and the driving/braking control unit is also used for controlling the vehicle rear axle to brake the whole vehicle according to the extra braking force when the vehicle rear axle meets the stability requirement.

Optionally, the front axle brake module further comprises an air control unit, the pedal simulator is connected with the air control unit and the bridge control unit through air pipes, and a communication connection is established between the air control unit and the bridge control unit;

the pedal simulator is used for outputting a braking electric signal to the front braking control unit according to the pedal opening degree of a braking pedal and outputting a braking air pressure signal to the air control unit according to the pedal opening degree of the braking pedal;

the front brake control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the brake electric signal;

and the air control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking air pressure signal when the front brake control unit breaks down.

Optionally, the input module further includes a parking switch, the rear axle braking module further includes an electromechanical brake, a communication connection is established between the parking switch and the driving/braking control unit, the parking switch is further connected with the driving/braking control unit through a hard wire, and the driving/braking control unit is connected with the electromechanical brake through a hard wire;

the parking switch is used for sending a parking braking signal to the driving/braking control unit through communication connection and/or hard wire connection;

and the driving/braking control unit is used for controlling the electronic mechanical brake to carry out parking braking through hard wire connection according to the parking braking signal.

Optionally, the input module further includes an accelerator pedal and a brake switch, the accelerator pedal and the brake switch are both connected with the vehicle controller through hard wires, and the front brake control unit and the drive/brake control unit are both in communication connection with the vehicle controller;

the vehicle control unit is used for outputting a redundant braking signal to the front braking control unit and the driving/braking control unit according to the state of the braking switch;

the front brake control unit is also used for controlling the front axle of the vehicle to brake the whole vehicle according to the redundant brake signal;

and the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the redundant braking signal.

Furthermore, the invention also proposes a vehicle comprising a brake system as described above.

The braking system comprises an input module, a front axle braking module and a rear axle braking module, wherein the front axle braking module and the rear axle braking module are both connected with the input module, and communication connection is established between the front axle braking module and the rear axle braking module; after the vehicle is powered on, the front axle brake module sends a front axle brake working signal to the rear axle brake module, the rear axle brake module sends a rear axle brake working signal to the front axle brake module, and the front axle brake module and the rear axle brake module are backup brake modules; the input module is used for inputting brake signals to the front axle brake module and the rear axle brake module; the front axle braking module is used for controlling a front axle and a rear axle of the vehicle to brake the whole vehicle according to the braking signal when the received rear axle braking working signal is a fault signal; and the rear axle braking module is used for controlling the vehicle rear axle and the vehicle front axle to brake the whole vehicle according to the braking signal when the received front axle braking working signal is a fault signal. The braking system provided by the invention comprises a front axle braking module for controlling the braking of a front axle of the vehicle and a rear axle braking module for controlling the braking of a rear axle of the vehicle, the two braking modules after the vehicle is electrified send braking working signals to each other through the established communication connection, the front axle braking module replaces the rear axle braking module to control the braking of the rear axle of the vehicle when the received rear axle braking working signals are fault signals, the rear axle braking module replaces the front axle braking module to control the braking of the front axle of the vehicle when the received front axle braking working signals are fault signals, the two braking modules are backup braking modules each other, when one braking module is in fault, the effective braking of the vehicle can still be carried out according to the braking signals, the stability of the braking system is improved, and the safety of the vehicle is improved.

Drawings

FIG. 1 is a block diagram of a first embodiment of a braking system according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the braking system of the present invention;

FIG. 3 is a schematic structural diagram of a front brake control unit in an embodiment of the braking system of the present invention;

FIG. 4 is a schematic structural diagram of a driving/braking control unit in an embodiment of the braking system of the present invention;

FIG. 5 is a schematic structural diagram of an axle control unit in an embodiment of the braking system of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a block diagram showing a first embodiment of a brake system according to the present invention, which is applied to a vehicle.

As shown in fig. 1, the braking system includes: the brake device comprises an input module 10, a front axle brake module 20 and a rear axle brake module 30, wherein the front axle brake module 20 and the rear axle brake module 30 are connected with the input module 10, and communication connection is established between the front axle brake module 20 and the rear axle brake module 30; after the vehicle is powered on, the front axle brake module 20 sends a front axle brake working signal to the rear axle brake module 30, the rear axle brake module 30 sends a rear axle brake working signal to the front axle brake module 20, and the front axle brake module 20 and the rear axle brake module 30 are backup brake modules.

It should be noted that, with the rapid development of the automobile modernization, the application of the brake-by-wire technology is more and more common, and the brake-by-wire technology is the key point of the chassis-by-wire in the automobile intelligent development, and the brake-by-wire system is generally divided into two categories: (1) Systems with mechanical reserve pressure, including electro-hydraulic braking systems (EHB braking systems) and electro-pneumatic braking systems (EBS braking systems); (2) Electromechanical brake systems (EMB brake systems) without mechanical back-up. The EMB brake system uses motor drive as a brake actuator to replace the traditional hydraulic or pneumatic brake for braking, and the brake actuating mechanisms of the automobile wheels are driven by independent motors and powered by independent power supplies. The EMB braking system greatly simplifies the structure of a brake-by-wire system, reduces energy transmission and conversion paths, and greatly improves the efficiency and the response of the system; and the EMB directly acts on the wheel edge, and the adjusting capacity of the braking force is improved. In the current brake-by-wire technical products which can be used for mass production, the brake-by-wire of a small vehicle is mainly realized by taking an EHB brake system as a main brake system at present, and the brake-by-wire of an air pressure commercial vehicle is mainly realized by taking an EBS brake system as a main brake system; although the EMB brake system has many advantages, the safety and reliability of the EMB brake system are highly required due to the complete elimination of the mechanical backup system.

In this embodiment, the input module 10 may be a module that collects brake signals and transmits the collected brake signals to a front axle brake module and a rear axle brake module; the front axle brake module may be a module adopting an EHB brake system or an EBS brake system, and this embodiment is described with the front axle brake module adopting an EBS brake system as an example; the rear axle brake module may be a module that employs an EMB brake system. The front axle braking module and the rear axle braking module are backup braking modules for each other, so that when the front axle braking module breaks down, the rear axle braking module controls the rear axle of the vehicle to brake the whole vehicle and replaces the front axle braking module to control the front axle of the vehicle to brake the whole vehicle; when the rear axle brake module breaks down, the front axle brake module takes over the rear axle brake module to control the rear axle of the vehicle to brake the whole vehicle while controlling the front axle of the vehicle to brake the whole vehicle.

The input module 10 is configured to input a braking signal to the front axle braking module 20 and the rear axle braking module 30; the front axle braking module 20 is configured to control a front axle and a rear axle of the vehicle to brake the whole vehicle according to the braking signal when the received rear axle braking operation signal is a fault signal; and the rear axle braking module 30 is used for controlling the rear axle and the front axle of the vehicle to brake the whole vehicle according to the braking signal when the received front axle braking working signal is a fault signal.

It can be understood that the rear axle brake operating signal may be a signal sent by the rear axle brake module to the front axle brake module to represent the current operating state of the rear axle brake module; the front axle brake working signal may be a signal sent by the front axle brake module to the rear axle brake module to represent the current working state of the front axle brake module. If the front axle braking working signal and the rear axle braking working signal are normal signals, the rear axle braking module serves as a braking main control module, the rear axle braking module determines rear axle required braking force and front axle required braking force according to the braking signals, the rear axle braking module controls the rear axle of the vehicle to brake the whole vehicle according to the rear axle required braking force, the front axle required braking force is sent to the front axle braking module, and the front axle braking module controls the front axle of the vehicle to brake the whole vehicle according to the received front axle required braking force.

In this embodiment, the front axle brake module adopts an EBS brake system with pneumatic mechanical backup brake, the rear axle brake module adopts an EMB brake system, and the EBS brake system and the EMB brake system are backup brake systems for each other, so that on the premise of realizing the brake-by-wire of the entire vehicle, the function of pneumatic mechanical backup brake is added through the front axle of the vehicle, and the safety redundancy capability of the brake system is improved.

In specific implementations, for example: the front axle braking module adopts an EBS braking system with air pressure mechanical backup braking, the rear axle braking module adopts an EMB braking system, the EMB braking system and the EBS braking system mutually send braking working signals after the vehicle is powered on, if the braking working signals are normal signals, the EMB braking system is used as a braking master control system, the EMB braking system determines the rear axle required braking force and the front axle required braking force according to the braking signals sent by the input module, the EMB braking system controls the rear axle of the vehicle to brake the whole vehicle according to the rear axle required braking force and sends the front axle required braking force to the EBS braking system, and the EBS braking system controls the front axle of the vehicle to brake the whole vehicle according to the received front axle required braking force; if the front axle brake working signal is a fault signal, the EMB brake system controls the rear axle of the vehicle to brake the whole vehicle according to the rear axle required brake force, and controls the front axle of the vehicle to brake the whole vehicle according to the front axle required brake force; if the rear axle brake working signal is a fault signal, the EBS brake system is used as a brake master control system, the EBS brake system determines the required braking force of the front axle and the required braking force of the rear axle according to the brake signal, controls the front axle of the vehicle to brake the whole vehicle according to the required braking force of the front axle, and controls the rear axle of the vehicle to brake the whole vehicle according to the required braking force of the rear axle; if the front axle brake working signal and the rear axle brake working signal are fault signals, the pneumatic mechanical backup brake attached to the EBS brake system performs pneumatic brake according to the brake signals; the process of determining the front axle required braking force and the rear axle required braking force according to the braking signal is the prior art, and the embodiment is not described herein again.

Further, referring to fig. 2, in order to improve stability of the brake system, the input module 10 includes a pedal simulator 101, the front axle brake module 20 includes a front brake control unit 201 and an axle control unit 202, the rear axle brake module 30 includes a driving/braking control unit 301, a communication connection is established between the front brake control unit 201 and the driving/braking control unit 301 and the pedal simulator 101, a communication connection is established between the front brake control unit 201 and the driving/braking control unit 301 and the axle control unit 202, a communication connection is established between the front brake control unit 201 and the driving/braking control unit 301, the front brake control unit 201 sends a front axle brake operating signal to the driving/braking control unit 301, and the driving/braking control unit 301 sends a rear axle brake operating signal to the front brake control unit 201.

In this embodiment, a schematic structural diagram of the front brake control unit 201 can refer to fig. 3, and the front brake control unit is composed of hardware, a base layer, an intermediate layer, and a software layer, where the software layer of the front brake control unit includes the following modules: signal fusion, fault detection, human Machine Interface (HMI), EBS braking, air supply, brake-by-wire, and rear axle braking (backup) functions; referring to fig. 4, the structural schematic diagram of the driving \ braking control unit 301 may be seen, the driving \ braking control unit is composed of hardware, a base layer, an intermediate layer and a software layer, the hardware layer includes driving/braking control hardware and braking energy supply/storage hardware, and the software layer of the driving \ braking control unit includes the following modules: anti-lock braking system (ABS), electronic Stability Control (ESC), parking brake, signal fusion, fault detection, human-machine interface (HMI), front axle brake (backup), drive control, regeneration

The functions of braking, braking control, EMB braking, EMB function, brake-by-wire, intelligent traction control and the like; 5 structural schematic diagram of the bridge control unit 202 can refer to fig. 5, the bridge control unit is composed of hardware, a base layer, an intermediate layer and software, wherein the software layer of the bridge control unit includes the following modules: wheel speed signal receiving, air pressure signal receiving, brake-by-wire, module power supply and ABS valve power supply.

It is noted that the driving/braking control unit integrates the related functions of high-voltage auxiliary driving control, motor driving control and EMB braking control, and is connected with the power battery, and directly supplies energy to the electronic 0 mechanical brake (EMB) through the DC/DC module when working, and the super capacitor module is arranged inside for storing energy,

in the emergency situations of power battery failure, power feeding and the like, the EMB brake is independently powered through the super capacitor.

The pedal simulator 101 is configured to send a braking signal to the front brake control unit 201 and the driving/braking control unit 301 through a communication connection.

5 it will be appreciated that the pedal simulator can send braking signals to the forward braking control unit and the driving/braking control unit depending on the braking force of the user.

The driving/braking control unit 301 is configured to determine a front axle required braking force and a rear axle required braking force according to the braking signal when the front axle braking operation signal is a fault signal; the driving/braking control

The unit 301 is further configured to control the rear axle of the vehicle to brake the whole vehicle according to the rear axle required braking force, and send the front axle required braking force to the axle control unit; and the axle control unit 202 is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

When the vehicle brakes, the driving/braking control unit is used as a braking main control module, and the driving/braking control unit performs load identification and distribution calculation of front and rear braking forces according to braking signals; drives and/or stands

The brake control unit judges whether 5 current brake demands of the whole vehicle can be met only by energy recovery based on the current available maximum energy recovery brake force and the rear axle stability, and if the energy recovery can meet the brake demands of the whole vehicle

If so, only controlling the driving motor to recover energy; if the energy recovery can not meet the braking requirement of the whole vehicle, determining the braking force required to be provided by the rear axle of the vehicle according to the currently available maximum energy recovery braking force and the total required braking force, and if the braking force required to be provided by the rear axle of the vehicle meets the stability requirement of the rear axle of the vehicle, only determining the braking force required to be provided by the rear axle of the vehicle

The rear axle of the vehicle is subjected to energy recovery braking and EMB braking torque decoupling; if the stability of the rear axle of the vehicle is not consistent with the requirement of 0, the braking force of the front axle of the vehicle and the braking force of the rear axle of the vehicle are distributed according to calculation, the driving/braking control unit is directly communicated with the bridge control unit, the braking force required by the front axle is distributed to the bridge control unit, and the front axle of the vehicle is controlled by the bridge control unit according to the braking force required by the front axle to brake.

In this embodiment, if the front brake control unit fails, the drive/brake control unit is used as a total brake control distribution unit of the whole vehicle, the drive/brake control unit controls the rear axle of the vehicle to brake the whole vehicle, and takes over the brake control of the front axle of the vehicle, the drive/brake control unit directly communicates with the axle control unit to implement brake-by-wire of the front axle of the vehicle, when the axle control unit of the front axle of the vehicle fails, the mechanical backup air pressure of the front axle corresponding to the pedal displacement can be determined based on the stroke of the pedal simulator, and the front axle of the vehicle is controlled by the air pressure to brake the whole vehicle.

Further, in order to improve the stability of the braking system, the front braking control unit 201 is configured to determine a front axle required braking force and a rear axle required braking force according to the braking signal when the rear axle braking operation signal is a fault signal, and control the vehicle front axle to perform the entire vehicle braking according to the front axle required braking force; the front brake control unit 201 is further configured to control the vehicle rear axle to perform vehicle braking according to the rear axle braking force demand.

In this embodiment, with reference to fig. 4, if the brake control module in the drive/brake control unit fails, the front brake control unit replaces the drive/brake control unit with the rear axle brake (backup) module to control the rear axle of the vehicle to brake the entire vehicle, if the EMB energy storage module of the rear axle of the vehicle can work normally, the braking is performed continuously according to the methods of preferential energy recovery, preferential decoupling of the rear axle, decoupling of the entire vehicle system, and ideal braking force distribution of the front axle and the rear axle, if the EMB energy storage module fails, the rear axle can only adopt energy recovery braking, and the entire vehicle performs maximum deceleration to control the front axle of the vehicle to brake according to the request within the range allowed by the ECE regulation line; if the driving/braking functions in the driving/braking control unit are all failed and the energy recovery and the EMB braking cannot be implemented, the front braking control unit controls the front axle of the vehicle to implement emergency braking, and when the electric control braking of the front axle of the vehicle is failed, the braking can be implemented through the pneumatic mechanical backup braking function.

It should be noted that the brake system provided in this embodiment has a multi-level redundancy capability, the drive/brake control unit serves as a brake system main control unit, and forms a mutual backup with the front brake control unit, both of which have a line control capability of simultaneously performing brake control on the front axle and the rear axle of the vehicle, and when one of the control units fails, the other control unit can quickly diagnose and take over the brake control on the failed axle; the front axle brake of the vehicle also has pneumatic mechanical backup brake, and when a driver drives the vehicle, the pedal simulator can be operated by the driver to control the air path to directly implement the mechanical brake of the front axle of the vehicle, so that the redundancy capability of a brake system is further enhanced, and the safety of service brake is guaranteed; the redundancy level of the whole system is greatly improved, and the safety backup risk of a pure EMB braking system is overcome; because the braking system adopts the EMB braking system at the rear axle of the vehicle and adopts the line control air pressure EBS braking system at the front axle of the vehicle, the volume and the volume of a braking energy supply system can be greatly reduced, the length of a pipeline is reduced, and the energy consumption of the braking system is reduced; further, the weight of the whole vehicle can be greatly reduced, and the assembly manufacturability is improved; based on multi-level redundancy, the front axle of the vehicle can realize two control backups of brake-by-wire and air pressure control brake, and the rear axle of the vehicle can form decoupling and backup of the EMB brake and the regenerative brake.

The braking system provided by the embodiment comprises an input module, a front axle braking module and a rear axle braking module, wherein the front axle braking module and the rear axle braking module are both connected with the input module, and communication connection is established between the front axle braking module and the rear axle braking module; after the vehicle is powered on, the front axle brake module sends a front axle brake working signal to the rear axle brake module, the rear axle brake module sends a rear axle brake working signal to the front axle brake module, and the front axle brake module and the rear axle brake module are backup brake modules; the input module is used for inputting braking signals to the front axle braking module and the rear axle braking module; the front axle braking module is used for controlling a front axle and a rear axle of the vehicle to brake the whole vehicle according to the braking signal when the received rear axle braking working signal is a fault signal; and the rear axle braking module is used for controlling the vehicle rear axle and the vehicle front axle to brake the whole vehicle according to the braking signal when the received front axle braking working signal is a fault signal. The braking system provided by the embodiment comprises a front axle braking module for controlling the braking of a front axle of a vehicle and a rear axle braking module for controlling the braking of a rear axle of the vehicle, the two braking modules after the vehicle is powered on send braking working signals to each other through the established communication connection, the front axle braking module takes over the rear axle braking module to control the braking of the rear axle of the vehicle when the received braking working signals of the rear axle are fault signals, the rear axle braking module takes over the braking of the front axle of the vehicle when the received braking working signals of the front axle are fault signals, the two braking modules are backup braking modules each other, when one of the braking modules breaks down, the effective braking of the vehicle can be still carried out according to the braking signals, the stability of the braking system is improved, and the safety of the vehicle is improved.

A second embodiment of the brake system of the invention is proposed based on the above-described first embodiment.

In this embodiment, with reference to fig. 2, the driving/braking control unit 301 is further configured to determine a braking type according to the braking signal when the front axle braking operation signal is a normal signal;

the driving/braking control unit 301 is further configured to determine a front axle required braking force and a rear axle required braking force according to the braking signal when the braking type is an emergency braking type;

the driving/braking control unit 301 is further configured to control the rear axle of the vehicle to perform overall vehicle braking according to the rear axle required braking force, and send the front axle required braking force to the front braking control unit;

the front brake control unit 301 is configured to control the front axle of the vehicle to perform overall vehicle braking according to the braking force required by the front axle.

It is understood that the braking types include an emergency braking type and a general braking type; the braking signal received by the driving/braking control unit can be a braking electric signal, and the manner of determining the braking type by the driving/braking control unit according to the braking signal can be as follows: (1) Determining the change rate of the brake electric signal in a preset time length, and judging that the brake type is an emergency brake type when the change rate is greater than the preset change rate; (2) When the value of the braking electric signal is greater than the preset value, it is determined that the braking type is the emergency braking type, and the braking type may also be determined in other manners, which is not limited herein.

In this embodiment, when the braking type is an emergency braking type, energy recovery is prohibited, the driving/braking control unit determines a front axle required braking force and a rear axle required braking force according to the braking signal, controls the rear axle of the vehicle to brake the whole vehicle according to the rear axle required braking force, and sends the front axle required braking force to the front braking control unit, and the front braking control unit controls the front axle of the vehicle to brake the whole vehicle according to the received front axle required braking force.

Further, in order to perform braking of the whole vehicle through energy recovery and friction at the same time, the driving/braking control unit 301 is further configured to determine a total required braking force according to the braking signal when the front axle braking operation signal is a normal signal, and determine an energy recovery braking force according to the power battery information and the power motor information; the driving/braking control unit 301 is further configured to determine a front axle required braking force and a rear axle required braking force according to the total required braking force and the energy recovery braking force, and send the front axle required braking force to the front braking control unit; the driving/braking control unit 301 is further configured to perform energy recovery braking according to the energy recovery braking force, and control the rear axle of the vehicle to perform overall vehicle braking according to the rear axle braking force demand; the front brake control unit 201 is further configured to control the front axle of the vehicle to perform overall vehicle braking according to the braking force required by the front axle.

It is understood that the total required braking force may be a total braking force required for braking the entire vehicle, which is determined according to the braking signal; the power battery information comprises electric quantity information of the power battery, and the power motor information can be information of a power motor for energy recovery; determining recoverable energy of the power battery according to the electric quantity information of the power battery, determining energy recovery braking force according to the power motor information, and if the power battery can store the recovered energy, performing energy recovery by using the energy recovery braking force; the friction braking force may be obtained by subtracting the energy recovery braking force from the total required braking force, and further, the friction braking force may be distributed into the front axle required braking force and the rear axle required braking force.

Further, in order to reduce energy loss during braking, the driving/braking control unit 301 is further configured to determine an additional required braking force according to the total required braking force and the energy recovery braking force, and determine whether the rear axle of the vehicle meets the stability requirement according to the additional required braking force; the driving/braking control unit 301 is further configured to control the vehicle rear axle to perform overall vehicle braking according to the extra-demand braking force when the vehicle rear axle meets the stability requirement.

In the present embodiment, the additional demand braking force is obtained by subtracting the energy recovery braking force from the total demand braking force; the stability requirement of the rear axle of the vehicle corresponds to a rear axle braking force threshold value, when the rear axle braking force is smaller than the rear axle braking force threshold value, the rear axle of the vehicle meets the stability requirement, otherwise, the rear axle of the vehicle does not meet the stability requirement; if the extra required braking force is smaller than the rear axle braking force threshold value, the rear axle of the vehicle can be controlled to brake the whole vehicle according to the extra required braking force, namely, the front axle of the vehicle does not need to be controlled to brake the whole vehicle.

The driving/braking control unit in this embodiment is further configured to determine a braking type according to the braking signal when the front axle braking operation signal is a normal signal; the driving/braking control unit is also used for determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal when the braking type is an emergency braking type; the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle and sending the braking force required by the front axle to the front braking control unit; and the front brake control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle. According to the embodiment, when the braking type is the emergency braking type, the friction braking is performed by directly determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal, so that the braking duration in the emergency braking scene is shortened, and the safety of the vehicle is improved.

Based on the above embodiments, a third embodiment of the brake system of the invention is proposed.

In this embodiment, the front axle brake module 20 further includes an air control unit 203, the pedal simulator 101 is connected to the air control unit 203 and the bridge control unit 202 through air pipes, and a communication connection is established between the air control unit 203 and the bridge control unit 202;

the pedal simulator 101 is configured to output a braking electric signal to the front brake control unit 201 according to a pedal opening degree of a brake pedal, and output a braking air pressure signal to the air control unit 203 according to the pedal opening degree of the brake pedal;

the front brake control unit 201 is used for controlling the front axle of the vehicle to brake the whole vehicle according to the brake electric signal;

and the air control unit 203 is used for controlling the front axle of the vehicle to brake the whole vehicle according to the brake air pressure signal when the front brake control unit breaks down.

It can be understood that the front brake control unit performs brake-by-wire according to the brake electric signal, and the EBS brake system preferentially uses brake-by-wire, that is, when the brake-by-wire is normal, the pneumatic mechanical backup brake does not work; when the brake-by-wire fails, the control unit controls the front axle of the vehicle to perform pneumatic mechanical backup braking according to the brake air pressure signal.

It should be noted that, with continued reference to fig. 2, the front axle brake module includes a wheel end air pressure brake, a wheel speed sensor, a wheel end ABS solenoid valve, an axle control unit, an air control unit, and a front brake control unit, where the air control unit includes an electric air compressor, an air processing unit, an air reservoir, etc., and the front brake control unit performs start-stop energy compensation control according to the air pressure sensor on the air reservoir, so as to ensure that the system maintains proper air pressure all the time; meanwhile, the current pressure value of the air storage cylinder is also used as the basic input for the front brake control unit to calculate the front axle braking force. The front axle wheel end line control function control is executed by the bridge control unit, and meanwhile, the module also collects and processes front wheel speed signals and current loop pressure signals, sends the front wheel speed signals and the current loop pressure signals to the front brake control unit and the driving/braking control unit for use, and supplies power for the ABS electromagnetic valve during working. The front brake control unit receives the front axle required braking force distributed by the drive/brake control unit and cooperatively implements ABS, ESC and other additional functions requiring front axle braking force regulation; meanwhile, a rear axle braking (backup) module is arranged in the front braking control unit, and when the control unit cannot acquire a normal working signal of the driving/braking control unit in a certain period or a received rear axle braking working signal is a fault signal in the real-time verification process, the rear axle braking (backup) module in the front braking control unit controls the rear axle of the vehicle to brake and perform overall control on the braking force of the whole vehicle.

In this embodiment, the front and rear axle brakes are backed up by two brake control units, in addition, the displacement sensor in the pedal simulator has two-way dual-redundancy line control signals which can be mutually verified (namely, communication connection is established between the pedal simulator and the drive/brake control unit and between the pedal simulator and the front brake control unit), the pedal simulator is also connected with the bridge control unit through an air pipe, the pedal simulator has a single-channel air pressure valve control function, the air pressure sensor is arranged in the bridge control unit, when the two-way dual-redundancy line control signals in the pedal simulator are all failed, the two controllers can combine the air pressure signals of the bridge control unit based on the brake switch signals to form the last control signal barrier of the whole vehicle, and front and rear brake distribution control is carried out according to a pressure increase curve.

It should be noted that the brake system of the embodiment integrates the control functions of the rear drive shaft, the EMB, the energy storage of the EMB, and the like, thereby greatly reducing the signal transmission time of the system, improving the system response and multidimensional decision-making capability, and greatly improving the stability of the entire vehicle during driving and braking; meanwhile, decoupling control of drive shaft energy recovery and EMB braking is more accurate, and the braking effect of the whole vehicle is improved.

In the embodiment, the front axle brake module further comprises an air control unit, the pedal simulator is connected with the air control unit and the bridge control unit through air pipes, and communication connection is established between the air control unit and the bridge control unit; the pedal simulator is used for simulating the braking pedal according to the braking force

The pedal opening degree outputs a braking electric signal to the front braking control unit, and a braking air pressure signal is output to the air control unit according to the pedal opening degree of 5 of the braking pedal; the front brake control unit is used

Controlling the front axle of the vehicle to brake the whole vehicle according to the brake electric signal; and the air control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking air pressure signal when the front brake control unit breaks down. The front axle brake module in this embodiment is based on an EBS brake system,

the brake system has the capability of controlling the motion, simultaneously the pedal simulator has the capability of backing up the air pressure, when 0 fault occurs in the on-line control motion, the front axle of the vehicle can be controlled to brake through the air pressure, the mechanical backup capability of the brake system is realized,

the safety of the vehicle is improved.

Based on the above embodiments, a fourth embodiment of the brake control system of the invention is proposed.

In this embodiment, the input module 10 further includes a parking switch 102, the rear axle braking module 5 further includes an electromechanical brake 303, a communication connection is established between the parking switch 102 and the driving/braking control unit 301, the parking switch 102 is further connected to the driving/braking control unit 301 through a hard wire, and the driving/braking control unit 301 is connected to the electromechanical brake 303 through a hard wire;

the parking switch 102 is configured to send a parking brake signal 0 to the driving/braking control unit 301 through communication connection and/or hard-wired connection;

and the driving/braking control unit 301 is configured to control the electromechanical brake 303 to perform parking braking through hard-wired connection according to the parking braking signal.

It can be understood that the parking switch sends a parking brake signal to the driving/braking control unit through a communication connection or a hard wire, and when one of the communication connection or the hard wire fails, the parking switch can still send a parking 5 vehicle brake signal to the driving/braking control unit, so that the parking brake is realized.

In this embodiment, with continued reference to fig. 2, the rear axle brake module includes an electromechanical brake (i.e., a wheel end EMB), a wheel speed sensor, an integrated electric drive axle, a driving/braking control unit, etc., wherein the wheel end EMB is controlled by an electromagnetic clutch to realize long-term braking locking and parking locking capabilities, and the integrated electric drive axle

The driving/braking control unit and the front braking control unit cooperate to realize 0 other various braking control functions, and with reference to fig. 4, the driving/braking control unit is internally provided with independent EMB braking supply/energy storage control hardware which is connected with the front braking control unit at the same time. And meanwhile, a front axle braking (backup) module is also arranged in the driving/braking control unit, and when the control unit cannot acquire the normal working signal of the front braking control unit in a certain period and the received front braking working signal is a fault signal in the real-time verification process, the front axle braking (backup) module in the driving/braking control unit controls the axle control unit to brake the front axle of the vehicle. In addition, the driving/braking control unit can receive a parking braking signal sent by a parking switch through a communication connection or a hard wire, and lock and park through an electromagnetic clutch on an transmission part of the EMB brake.

The input module in this embodiment further includes a parking switch, the rear axle braking module further includes an electromechanical brake, the parking switch is in communication connection with the driving/braking control unit, the parking switch is also in hard-wired connection with the driving/braking control unit, and the driving/braking control unit is in hard-wired connection with the electromechanical brake; the parking switch is used for sending a parking braking signal to the driving/braking control unit through communication connection and/or hard wire connection; and the driving/braking control unit is used for controlling the electronic mechanical brake to carry out parking braking through hard wire connection according to the parking braking signal. The parking switch in the embodiment can simultaneously send parking braking signals to the driving/braking control unit through communication connection and a hard wire, and when one path of signals breaks down, parking braking can still be achieved, so that the safety of parking braking is improved.

Based on the above embodiments, a fifth embodiment of the brake control system of the invention is proposed.

In this embodiment, the input module 10 further includes an accelerator pedal 103 and a brake switch 104, the accelerator pedal 103 and the brake switch 104 are both connected to the vehicle control unit VCU through a hard wire, and the front brake control unit 201 and the driving/braking control unit 301 are both connected to the vehicle control unit VCU through communication;

the vehicle control unit is configured to output a redundant braking signal to the front braking control unit 201 and the driving/braking control unit 301 according to the state of the braking switch;

the front brake control unit 201 is further configured to control the front axle of the vehicle to brake the whole vehicle according to the redundant brake signal;

the driving/braking control unit 301 is further configured to control the vehicle rear axle to perform vehicle braking according to the redundant braking signal.

It should be understood that the redundant brake signal may be a brake signal sent by a user through a brake switch, and the entire vehicle brake can be performed in an emergency; the VCU may also output a corresponding braking signal to the front braking control unit and the driving/braking control unit according to the signal of the accelerator pedal, which is the prior art, and the embodiment is not limited herein.

In this embodiment, the brake pedal, the brake switch and the parking switch provide input equipment for a driver to perform brake operation, the brake switch and a signal of an air pressure sensor in the axle control unit together form a redundant brake input signal, the parking brake switch is normally pulled to send a dynamic parking request, and the drive/brake control unit cooperates with the front brake control unit when receiving the dynamic parking request, so that the emergency dynamic parking is implemented by fully utilizing the mechanical brake of the front axle of the vehicle, the mechanical brake of the rear axle of the vehicle and the regenerative brake. The driving/braking control unit is used as a main control unit of the whole vehicle braking, the whole service braking and the regeneration braking are decoupled, the service braking force of the whole vehicle is distributed front and back, and the EMB braking and the regeneration braking are decoupled for the rear axle of the vehicle. The driving/braking control unit can also simultaneously receive a signal of a four-wheel speed sensor, a signal of a motor rotating speed revolution change sensor, a signal of an inertia unit, a corner signal and the like, quickly identify the current actual speed, the wheel speed of a driving wheel and the input and the posture of the whole vehicle based on the signals, quickly judge whether a driving slip trend occurs or not, and start to intervene torque and braking torque in the early stage of driving slip based on the high-frequency, high-precision and high real-time performance of the signal of the motor rotating speed revolution change sensor

The input module of the embodiment further comprises an accelerator pedal and a brake switch, wherein the accelerator pedal and the brake switch are connected with the vehicle control unit through hard wires, and the front brake control unit and the driving/braking control unit are in communication connection with the vehicle control unit; the vehicle control unit is used for outputting a redundant braking signal to the front braking control unit and the driving/braking control unit according to the state of the braking switch; the front brake control unit is also used for controlling the front axle of the vehicle to brake the whole vehicle according to the redundant brake signal; and the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the redundant braking signal. In the embodiment, emergency braking can be realized through the redundant braking signal output by the braking switch, and the stability of the braking system and the safety of the vehicle are further improved.

In other embodiments, a vehicle is also presented that includes a braking system as described above.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A braking system is characterized in that the braking system is applied to a vehicle and comprises an input module, a front axle braking module and a rear axle braking module, wherein the front axle braking module and the rear axle braking module are both connected with the input module, and communication connection is established between the front axle braking module and the rear axle braking module; after the vehicle is powered on, the front axle brake module sends a front axle brake working signal to the rear axle brake module, the rear axle brake module sends a rear axle brake working signal to the front axle brake module, and the front axle brake module and the rear axle brake module are backup brake modules;

the input module is used for inputting brake signals to the front axle brake module and the rear axle brake module;

the front axle braking module is used for controlling a front axle and a rear axle of the vehicle to brake the whole vehicle according to the braking signal when the received rear axle braking working signal is a fault signal; and

and the rear axle braking module is used for controlling the vehicle rear axle and the vehicle front axle to brake the whole vehicle according to the braking signal when the received front axle braking working signal is a fault signal.

2. The brake system of claim 1, wherein the input module includes a pedal simulator, the front axle brake module includes a front brake control unit and an axle control unit, the rear axle brake module includes a drive/brake control unit, the front brake control unit and the drive/brake control unit are both in communication with the pedal simulator, the front brake control unit and the drive/brake control unit are both in communication with the axle control unit, the front brake control unit and the drive/brake control unit are in communication with each other, the front brake control unit sends a front axle brake operation signal to the drive/brake control unit, and the drive/brake control unit sends a rear axle brake operation signal to the front brake control unit;

the pedal simulator is used for sending a braking signal to the front braking control unit and the driving/braking control unit through communication connection;

the driving/braking control unit is used for determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal when the braking working signal of the front axle is a fault signal;

the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle and sending the braking force required by the front axle to the axle control unit;

and the bridge control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

3. The brake system of claim 2, wherein the front brake control unit is configured to determine a front axle required braking force and a rear axle required braking force according to the brake signal when the rear axle brake operation signal is a fault signal, and control the front axle of the vehicle to brake the whole vehicle according to the front axle required braking force;

and the front brake control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle.

4. The brake system according to claim 2 or 3, wherein the drive/brake control unit is further configured to determine a brake type according to the brake signal when the front axle brake operation signal is a normal signal;

the driving/braking control unit is also used for determining the required braking force of the front axle and the required braking force of the rear axle according to the braking signal when the braking type is an emergency braking type;

the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the braking force required by the rear axle and sending the braking force required by the front axle to the front braking control unit;

and the front brake control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

5. The brake system of claim 4, wherein the drive/brake control unit is further configured to determine a total required braking force according to the brake signal and determine an energy recovery braking force according to power battery information and power motor information when the front axle brake operation signal is a normal signal;

the driving/braking control unit is further used for determining a front axle required braking force and a rear axle required braking force according to the total required braking force and the energy recovery braking force and sending the front axle required braking force to the front braking control unit;

the driving/braking control unit is also used for carrying out energy recovery braking according to the energy recovery braking force and controlling the rear axle of the vehicle to carry out whole vehicle braking according to the rear axle braking force demand;

and the front brake control unit is also used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking force required by the front axle.

6. The brake system according to claim 5, wherein the drive/brake control unit is further configured to determine an additional required braking force based on the total required braking force and the energy recovery braking force, and determine whether the vehicle rear axle satisfies a stability requirement based on the additional required braking force;

and the driving/braking control unit is also used for controlling the vehicle rear axle to brake the whole vehicle according to the extra braking force when the vehicle rear axle meets the stability requirement.

7. The brake system according to claim 2 or 3, wherein the front axle brake module further comprises an air control unit, the pedal simulator is connected with the air control unit and the bridge control unit through air pipes, and a communication connection is established between the air control unit and the bridge control unit;

the pedal simulator is used for outputting a braking electric signal to the front braking control unit according to the pedal opening degree of a braking pedal and outputting a braking air pressure signal to the air control unit according to the pedal opening degree of the braking pedal;

the front brake control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the brake electric signal;

and the air control unit is used for controlling the front axle of the vehicle to brake the whole vehicle according to the braking air pressure signal when the front brake control unit breaks down.

8. The brake system according to claim 2 or 3, wherein the input module further comprises a parking switch, the rear axle brake module further comprises an electromechanical brake, the parking switch is in communication connection with the drive/brake control unit, the parking switch is also in hard-wired connection with the drive/brake control unit, and the drive/brake control unit is in hard-wired connection with the electromechanical brake;

the parking switch is used for sending a parking braking signal to the driving/braking control unit through communication connection and/or hard wire connection;

and the driving/braking control unit is used for controlling the electronic mechanical brake to perform parking braking through hard wire connection according to the parking braking signal.

9. The braking system of claim 2 or 3, wherein the input module further comprises an accelerator pedal and a brake switch, the accelerator pedal and the brake switch are both connected with the vehicle controller through hard wires, and communication connections are established between the front brake control unit and the drive/brake control unit and the vehicle controller;

the vehicle control unit is used for outputting a redundant braking signal to the front braking control unit and the driving/braking control unit according to the state of the braking switch;

the front brake control unit is also used for controlling the front axle of the vehicle to brake the whole vehicle according to the redundant brake signal;

and the driving/braking control unit is also used for controlling the rear axle of the vehicle to brake the whole vehicle according to the redundant braking signal.

10. A vehicle, characterized in that the vehicle comprises a brake system according to any one of claims 1-9.

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