CN214985306U

CN214985306U - Vehicle hill start auxiliary system based on electronic control air brake

Info

Publication number: CN214985306U
Application number: CN202022499260.1U
Authority: CN
Inventors: 周宸羽; 郑晟; 陈文淼; 王琛; 詹君; 阳冬波; 张磊
Original assignee: Qingzhi Automobile Technology Suzhou Co ltd
Current assignee: Qingzhi Automobile Technology Suzhou Co ltd
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-12-03
Anticipated expiration: 2030-11-02

Abstract

The utility model discloses a vehicle hill start auxiliary system based on automatically controlled air brake, include: the system comprises a system controller, a first brake air chamber, a second brake air chamber, a first ABS electromagnetic valve, a second ABS electromagnetic valve, a proportional relay electromagnetic valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a first wheel speed sensor, a second wheel speed sensor, a foot valve, an air storage cylinder, a system switch, a whole vehicle CAN and a pressurizing channel.

Description

Vehicle hill start auxiliary system based on electronic control air brake

Technical Field

The utility model belongs to the technical field of the automotive electronics control technique and specifically relates to a vehicle hill start auxiliary technology based on automatically controlled air brake is related to.

Background

When the existing vehicle starts on an uphill road, the driver can slide backwards due to improper operation, and the hill starting auxiliary system can effectively avoid the phenomenon of sliding backwards, so that the hill starting safety is improved.

Most of the conventional hill start auxiliary systems need a gradient sensor, a clutch sensor, a parking brake sensor and other related components, and are high in research and development cost and difficult to realize.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vehicle turns to supplementary confirmation device to solve the problem among the above-mentioned background art, accomplish whole car vehicle hill start assist function's development through the mode that does not increase the hardware cost.

In order to achieve the above object, the utility model adopts the following technical scheme:

an electronic control pneumatic brake based vehicle hill start assist system comprising: a system controller, a first brake air chamber, a second brake air chamber, a first ABS solenoid valve, a second ABS solenoid valve, a proportional relay solenoid valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a first wheel speed sensor, a second wheel speed sensor foot valve and an air reservoir,

wherein, the system controller is used as a control terminal of the hill start auxiliary system and is respectively connected with the first ABS electromagnetic valve, the second ABS electromagnetic valve, the proportional relay electromagnetic valve, the first pressure sensor, the second pressure sensor, the third pressure sensor, the first wheel speed sensor and the second wheel speed sensor through electric signals,

the foot valve is mainly a brake pedal system, is in electrical signal connection with the third pressure sensor, is connected with the air storage cylinder and the air path of the proportional relay solenoid valve, and is connected with the air path of the proportional relay solenoid valve; the proportional relay solenoid valve is used for distributing braking pressure and is respectively connected with the first ABS solenoid valve and the second ABS solenoid valve through air circuits;

the first ABS electromagnetic valve, the first pressure sensor and the first brake air chamber form an air path loop,

and the second ABS electromagnetic valve, the second pressure sensor and the second brake air chamber form an air circuit loop.

More preferably, the vehicle hill start assisting system based on the electronic control air pressure brake is characterized by further comprising a system switch, wherein the system switch is in electric signal connection with a system controller, and the system switch can achieve the opening and closing of the hill start assisting function.

More preferably, the vehicle hill start auxiliary system based on the electric control air brake is characterized by further comprising a whole vehicle CAN, wherein the whole vehicle CAN is in electric signal connection with the starting auxiliary system, and the starting auxiliary system CAN be communicated with the whole vehicle.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus

FIG. 2 is a flowchart of a control method

In the figure: 100-system controller, 210-first brake chamber, 220-second brake chamber, 310-first ABS solenoid valve, 320-second ABS solenoid valve, 400-proportional relay solenoid valve, 510-first pressure sensor, 520-second pressure sensor, 530-third pressure sensor, 610-first wheel speed sensor, 620-second wheel speed sensor, 700-foot valve, 800-air cylinder, system switch 910, whole vehicle CAN920 and pressurizing channel 930.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, an embodiment of the present invention is provided:

an electronic control pneumatic brake based vehicle hill start assist system comprising: the system controller 100, the first brake chamber 210, the second brake chamber 220, the first ABS solenoid valve 310, the second ABS solenoid valve 320, the proportional relay solenoid valve 400, the first pressure sensor 510, the second pressure sensor 520, the third pressure sensor 530, the first wheel speed sensor 610, the second wheel speed sensor 620, the foot valve 700, the air reservoir 800, the system switch 910, the entire vehicle CAN920 and the pressurizing passage 930,

the system controller 100 is used as a control terminal of the hill start auxiliary system and is respectively in electrical signal connection with the first ABS solenoid valve 310, the second ABS solenoid valve 320, the proportional relay solenoid valve 400, the first pressure sensor 510, the second pressure sensor 520, the third pressure sensor 530, the first wheel speed sensor 610 and the second wheel speed sensor 620, the foot valve 700 is a main device of the brake pedal system, is in electrical signal connection with the third pressure sensor 530, and is in gas circuit connection with the air cylinder 800 and the proportional relay solenoid valve 400, and the air cylinder 800 is in gas circuit connection with the proportional relay solenoid valve 400; the proportional relay solenoid valve 400 is used for distributing brake pressure and is respectively connected with the first ABS solenoid valve 310 and the second ABS solenoid valve 320 through a pressurizing passage 930, the first ABS solenoid valve 310, the first pressure sensor 510 and the first brake chamber 210 form an air path loop, and the second ABS solenoid valve 320, the second pressure sensor 520 and the second brake chamber 220 form an air path loop.

The first wheel speed sensor 610 is installed on the left wheel for obtaining the wheel speed of the left wheel. The second wheel speed sensor 620 is installed on the right wheel for acquiring the wheel speed of the right wheel. A proportional relay solenoid valve 400 for controlling the rear axle brake pressure; the first ABS solenoid valve 310 is used to control the pressure applied to the first brake chamber 210 by the proportional relay solenoid valve 400, and has the functions of pressurization, pressure maintaining, and pressure relief. The second ABS solenoid valve 320 serves to control the pressure applied to the second brake chamber 220 by the proportional relay solenoid valve 400.

The system switch 910 is a contact switch that the driver can manually depress to activate the system.

The entire vehicle CAN920 is used to obtain an engine torque signal and feed back to the system controller 100.

The system controller 100 includes a system function activation judging module, a vehicle state identifying module, a system power-on mode selecting module, a target pressure output calculating module, and a brake pressure control module, and can process the ramp auxiliary system function activation state, the vehicle state identification, and the system power-on mode capability.

In combination with the above mechanical structure, the scheme also provides a corresponding control method flow, as shown in fig. 2.

A vehicle hill start assist control method includes the following steps:

a. judging whether the system is activated: judging whether the hill start auxiliary system is activated or not mainly through the state of a system switch, entering the step b if the hill start auxiliary system is activated, and continuously and repeatedly detecting if the hill start auxiliary system is not activated;

b. judging whether the vehicle is static: judging whether the vehicle is static or not through the first wheel speed sensor and the second wheel speed sensor, if not, returning to the step a again, and if so, entering the step c;

c. judging whether the brake pressure reaches a target value: judging whether the vehicle braking pressure reaches 0.7-0.8 Mpa through the first pressure sensor and the second pressure sensor, if so, entering the step d, and if not, entering the step e;

d. mode 1: c, in a pressurization mode, continuously returning to the step c for pressure detection until the brake pressure reaches a target value;

e. mode 2: keeping the pressure, ensuring the brake pressure to be always above 0.7-0.8 Mpa, and entering the step f;

f. judging whether the brake pedal is released: judging whether the brake pedal is released or not through a pressure sensor of the brake pedal, if not, returning to the step e, and if so, entering the step g;

g. after the mode 2 lasts for 4s, entering a step h;

h. mode 3: starting early warning, judging whether the vehicle has a starting action or not through the torque output by the engine, if not, entering a step i, and if so, entering a step j;

i. and (4) system fault alarming: the system gives an alarm in an acousto-optic mode and returns to the step g again;

j. mode 4: in the pressure relief mode, the brake pressure of the brake air chamber is reduced along with the increase of the torque of the engine until the brake pressure is reduced to zero after the vehicle starts;

the pressure relief mode brake pressure decreases with increasing engine torque, and the specific calculation formula is: f_b0＝F_b1-(T₀-T₁) i/R, wherein F_b0For the target braking force at the present moment, F_b1For the last moment of power, T₀For the current moment of engine torque, T₁For the engine torque at the previous time, i is the transmission ratio, and R is the wheel radius.

k. And (6) ending.

Wherein, the d. mode 1: the supercharging mode comprises the following specific processes:

a1. obtaining a target brake pressure;

b1. the system controller controls the proportional relay solenoid valve, the first ABS solenoid valve and the second ABS solenoid valve to be opened, and air pressure enters the first brake air chamber and the second brake air chamber from the air storage cylinder;

c1. the first pressure sensor and the second pressure sensor sense the brake pressure of the first brake chamber and the second brake chamber;

d1. when the brake pressure reaches the target value, the system controller controls the proportional relay solenoid valve, the first ABS solenoid valve and the second ABS solenoid valve to be closed, and the pressurization mode is completed.

Claims

1. A vehicle hill start assist system based on electronically controlled pneumatic braking, comprising: a system controller, a first brake air chamber, a second brake air chamber, a first ABS solenoid valve, a second ABS solenoid valve, a proportional relay solenoid valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a first wheel speed sensor, a second wheel speed sensor, a foot valve and an air reservoir,

2. The vehicle hill start assisting system based on the electric control pneumatic brake as claimed in claim 1, further comprising a system switch, wherein the system switch is electrically connected with the system controller, and the system switch can be used for realizing the opening and closing of the hill start assisting function.

3. The vehicle hill start auxiliary system based on the electric control air brake as claimed in claim 1, characterized by further comprising a whole vehicle CAN, wherein the whole vehicle CAN is in electrical signal connection with the starting auxiliary system, so that the communication between the starting auxiliary system and the whole vehicle CAN be realized.