CN-121989704-A - Brake management control system and method for hybrid commercial vehicle

CN121989704ACN 121989704 ACN121989704 ACN 121989704ACN-121989704-A

Abstract

The invention discloses a brake management control system and a brake management control method for a hybrid commercial vehicle, which relate to the technical field of vehicle brake control and comprise a load and road surface sensing module for generating a road surface comprehensive signal; the braking demand analysis module generates a power demand signal, the braking force distribution control module generates a composite braking control signal containing a regenerative braking torque distribution command and a friction braking pressure regulation command, the electromechanical execution driving module respectively generates a driving motor regenerative braking execution signal and a brake air pressure/hydraulic pressure regulation execution signal to control the motor and the friction brake to cooperatively output braking force, and the unified strategy configuration module is respectively connected with the braking force distribution control module and the electromechanical execution driving module and provides braking distribution strategy signals containing regenerative braking intervention curves under different load states for the braking force distribution control module. The invention can solve the problem that the braking safety, the energy recovery efficiency and the braking smoothness are difficult to ensure simultaneously.

Inventors

XU FANG
XU ZHENFEI
LIU JIANG
Alexander Huvat
XU QIFANG

Assignees

临沂高新区鸿图电子有限公司
临沂科技职业学院
青岛理工大学

Dates

Publication Date: 20260508
Application Date: 20260330

Claims (10)

1. A hybrid commercial vehicle brake management control system, comprising: The load and road surface sensing module is used for acquiring the dynamic load state of the vehicle and the real-time road surface adhesion coefficient in real time and generating a road surface comprehensive signal; The brake demand analysis module is used for collecting a brake pedal opening signal and an opening change rate signal in real time and generating a power demand signal; The braking force distribution control module is used for respectively receiving the road surface comprehensive signal and the power demand signal, comparing the current maximum available braking force of the road surface represented by the road surface comprehensive signal with the power demand signal, and generating a composite braking control signal comprising a regenerative braking torque distribution command and a friction braking pressure adjustment command; The electromechanical execution driving module receives the composite braking control signal and respectively generates a driving motor regenerative braking execution signal and a brake air pressure/hydraulic pressure adjustment execution signal so as to control the motor and the friction brake to cooperatively output braking force; The unified strategy configuration module is respectively connected with the braking force distribution control module and the electromechanical execution driving module, provides braking force distribution strategy signals containing regenerative braking intervention curves under different load states for the braking force distribution control module, and provides actuating mechanism parameter signals containing dynamic response characteristics of a brake for the electromechanical execution driving module.
2. The hybrid commercial vehicle brake management control system according to claim 1, wherein the brake force distribution control module includes a safety brake determination unit that extracts a current road surface maximum providable brake force value based on the road surface integrated signal, compares a driver target brake force demand in the power demand signal with the maximum providable brake force value, and generates an antilock coordination control signal for restricting an output amplitude of a regenerative brake torque distribution command in the composite brake control signal to preferentially secure steering stability and a wheel antilock state when the driver target brake force demand is determined to be greater than the current road surface maximum providable brake force.
3. The braking management control system of a hybrid commercial vehicle according to claim 1, wherein the braking force distribution control module includes a load adaptive distribution unit that receives dynamic load states included in the road surface integrated signal, acquires regenerative braking intervention curves in different load states from the unified policy configuration module, selects corresponding intervention curves according to whether a current dynamic load state is in a heavy load region or a light load region, generates a regenerative braking torque distribution instruction adapted to the current load state, causes regenerative braking of the vehicle to intervene with a faster gradient in a heavy load state to share a friction braking load, and causes regenerative braking to intervene with a slower gradient in a light load state and to perform fine compensation by friction braking to prevent wheel locking.
4. The braking management control system of a hybrid commercial vehicle according to claim 1, wherein the load and road surface sensing module calculates an adhesion coefficient state of a road surface on which the vehicle is running in real time by analyzing differences between wheel speed sensor signals of a plurality of wheels and longitudinal acceleration signals of the vehicle, simultaneously calculates dynamic load mass of the vehicle in real time by combining a vehicle height or deformation signal output by an air suspension system or a leaf spring deformation sensor, and generates the road surface comprehensive signal by fusing the adhesion coefficient state and the dynamic load mass, wherein the signal simultaneously represents an adhesion limit of a current road surface and an actual load state of the vehicle.
5. The brake management control system of a hybrid commercial vehicle according to claim 1, wherein the brake demand analysis module includes a brake intention prediction unit that monitors a time-series variation trend of a brake pedal opening signal in real time and calculates a variation rate characteristic thereof, predicts a target brake force variation trend of a driver within a preset time window in the future in combination with a current running speed signal of the vehicle, generates a power demand signal including a current brake force demand and a future brake force demand trend, and transmits the signal to the brake force distribution control module so that the brake force distribution control module can adjust a participation ratio of regenerative braking and friction braking in advance.
6. The brake management control system of claim 1, wherein the unified strategy configuration module stores actuator parameter signals corresponding to different vehicle types and different brake types, the signals including a response delay time constant of a pneumatic brake system, a pressure build rate characteristic of a hydraulic brake system, and a friction coefficient temperature characteristic of a drum brake or a disc brake, and the electromechanical actuation drive module receives the actuator parameter signals and generates an accurate brake air pressure or hydraulic pressure adjustment execution signal in combination with the response characteristic of a current actuator according to a pressure adjustment command in the composite brake control signal.
7. The brake management control system of a hybrid commercial vehicle according to claim 1, further comprising a thermal load monitoring module, wherein the thermal load monitoring module monitors a temperature state of a friction brake in real time and generates a brake thermal load state signal, the brake thermal load state signal is transmitted to the brake force distribution control module, the brake force distribution control module judges whether a current brake has a heat deterioration risk according to the thermal load state signal, and when judging that the heat deterioration risk exists, the brake force distribution control module adjusts a weight of a regenerative brake torque distribution command in the composite brake control signal, forcibly increases a participation proportion of motor braking and correspondingly reduces a friction brake pressure adjustment command, so that the friction brake obtains a cooling time to keep a braking efficiency in a cold standby state.
8. The system according to claim 1, wherein the brake force distribution control module comprises a smooth transition control unit, and the unit adopts a dual adjustment algorithm to control the decreasing change rate of the regenerative brake torque distribution command and the increasing change rate of the friction brake pressure adjustment command respectively during the transition process of the regenerative brake exiting and the friction brake intervening, so that the change rates of the regenerative brake torque distribution command and the friction brake pressure adjustment command on a time axis are mutually coordinated, and the fluctuation range of the brake torque of the whole vehicle in unit time is limited within a preset smoothness threshold value range under the condition that the total brake force is kept unchanged, so as to improve the brake comfort feeling of a driver and passengers.
9. The braking management control system of a hybrid commercial vehicle according to claim 1, wherein the electromechanical execution driving module is connected with a driving motor controller and a braking system electronic control unit respectively, the driving motor regenerative braking execution signal is transmitted to the driving motor controller to adjust the generated torque of the motor, and the brake air pressure or hydraulic pressure adjustment execution signal is transmitted to the braking system electronic control unit to control a pressure adjusting valve in a braking pipeline, so that parallel execution and cooperation of regenerative braking force and friction braking force are realized, the regenerative braking execution signal and the braking system electronic control unit are mutually independent in an execution level, and the respective output sizes can be dynamically adjusted in real time according to the composite braking control signal.
10. A method of a hybrid commercial vehicle brake management control system according to any one of claims 1-9, comprising: s1, acquiring a dynamic load state of a vehicle and a real-time road surface adhesion coefficient in real time, and generating a road surface comprehensive signal; S2, acquiring a brake pedal opening signal and an opening change rate signal in real time to generate a power demand signal; S3, respectively receiving the road surface comprehensive signal and the power demand signal, and comparing the maximum available braking force of the current road surface represented by the road surface comprehensive signal with the power demand signal to generate a composite braking control signal containing a regenerative braking torque distribution command and a friction braking pressure regulation command; S4, receiving the composite braking control signal, and respectively generating a regenerative braking execution signal of a driving motor and a pneumatic/hydraulic pressure regulation execution signal of a brake so as to control the motor and the friction brake to cooperatively output braking force; And S5, providing a brake distribution strategy signal containing regenerative braking intervention curves under different load states, and providing an actuator parameter signal containing dynamic response characteristics of the brake.

Description

Brake management control system and method for hybrid commercial vehicle Technical Field The invention relates to the technical field of vehicle brake control, in particular to a brake management control system and method for a hybrid commercial vehicle. Background The performance of the braking system of a hybrid commercial vehicle, which is an important component in the field of transportation, is directly related to driving safety, operational economy and the working strength of a driver. With the popularity of hybrid technology, vehicle braking systems evolve from a single friction braking mode to a compound braking mode in which regenerative braking provided by electric motor braking cooperates with conventional pneumatic or hydraulic friction braking. The regenerative braking can convert part of kinetic energy into electric energy to be stored in the power battery in the vehicle deceleration process, and has important significance for improving the fuel economy and the driving range of the whole vehicle. However, the commercial vehicle has extremely complex application scenes, including various working conditions such as urban buses, long-distance logistics, mine transportation and the like, and the total mass of the vehicle has huge variation range under no-load and full-load states, even can reach a multiple difference. This large difference in load places severe demands on the control of the brake system. In the prior art, a part of brake control strategies are used for simply distributing braking force mainly according to the vehicle speed, the opening degree of a brake pedal and the charge state of a battery. For example, regenerative braking is preferred for energy recovery when the battery level is low, and friction braking is more dependent when the battery level is sufficient or the vehicle is traveling at high speeds. The control logic with single dimension can achieve a certain effect on a passenger car with constant load, but has obvious defects on a commercial car with severe load change. When the vehicle is in idle load or light load, if regenerative braking torque intervenes too hard, the braking force of the wheels is extremely easy to exceed the ground attachment limit, the risk of locking or sideslip of the wheels is caused, and the driving safety is seriously threatened. When the vehicle is in heavy load running on a long downhill road section, if regenerative braking capacity is limited or exits due to full charge of a battery, all braking loads are borne by a friction brake, so that the temperature of the brake rises sharply, a heat fading phenomenon is generated, braking torque is greatly reduced, and a great potential safety hazard of braking failure exists. In addition, in the electromechanical braking force switching process, torque fluctuation or impact feeling often exists in the prior art, so that the smoothness and the comfort of driving are affected, and the operation fatigue of a driver is aggravated. Therefore, how to construct a set of brake management control system which can adapt to the load change of the vehicle and the road surface attachment condition and give consideration to the energy recovery efficiency, the braking safety and the smoothness becomes a technical problem to be solved in the field. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a brake management control system and method for a hybrid commercial vehicle, which are used for solving the technical problem that the brake safety, the energy recovery efficiency and the brake smoothness are difficult to ensure simultaneously under the working condition that the load of the conventional hybrid commercial vehicle brake system is changed severely. According to the invention, the dynamic load of the vehicle and the attachment limit of the road surface are perceived in real time, the output of regenerative braking and friction braking is dynamically coordinated by the braking force distribution control module based on the multimode intervention curve in the unified strategy configuration module, and a composite braking control signal is generated, so that the accurate, safe and efficient distribution of braking torque is realized. The invention provides a brake management control system of a hybrid commercial vehicle, which comprises the following components: The load and road surface sensing module is used for acquiring the dynamic load state of the vehicle and the real-time road surface adhesion coefficient in real time and generating a road surface comprehensive signal; The brake demand analysis module is used for collecting a brake pedal opening signal and an opening change rate signal in real time and generating a power demand signal; the braking force distribution control module is used for respectively receiving the road surface comprehensive signal and the power demand signal, comparing the maximum available braking force of the current road surfa