CN212709356U

CN212709356U - Vehicle brake-by-wire system with redundant isolation valve

Info

Publication number: CN212709356U
Application number: CN202021032164.XU
Authority: CN
Inventors: 段文杰; 杨益; 唐井岭; 瞿振华
Original assignee: Suzhou Cartai Automobile Technology Co ltd
Current assignee: Suzhou Cartai Automobile Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-03-16
Anticipated expiration: 2030-06-08

Abstract

The utility model discloses a vehicle line control brake system with redundant isolation valves, which comprises a motor control component, an active pressurizing component, an isolation control component and a pedal type brake master cylinder, the active increasing component comprises a pinion, a gearwheel, a nut, a screw rod and an active pressurizing main cylinder, the active pressurization main cylinder comprises a first oil inlet and outlet hole and a second oil inlet and outlet hole, the isolation control assembly comprises a first oil path, an isolation electromagnetic valve, a redundant isolation electromagnetic valve and a pressure sensor, wherein the first oil inlet and outlet hole is communicated with a brake wheel cylinder, wherein the second oil inlet and outlet hole of the active pressurization master cylinder is communicated with the brake wheel cylinder, the isolation solenoid valve is in an open state in the conventional running process of the vehicle and is in a closed state in the braking process of the vehicle, and the redundant solenoid valve replaces the isolation solenoid valve to work when the isolation solenoid valve fails. When the pressure sensor detects that the isolation solenoid valve fails, the redundant isolation solenoid valve is used as a backup to realize pressurization.

Description

Vehicle brake-by-wire system with redundant isolation valve

Technical Field

The utility model relates to a vehicle by-wire braking system especially relates to a vehicle by-wire braking system with redundant isolating valve.

Background

At present, the most widely applied brake systems on automobiles mainly comprise two types: one is a vacuum assisted brake system and the other is an electro-hydraulic brake system.

In recent years, automobiles are developed towards light weight, electromotion, intellectualization and intelligent networking, wherein new energy automobiles and intelligent automobiles are important for development and are also the main direction and key competitive field of automobile development in the future.

The rapid development of new energy vehicles and intelligent vehicles also puts new and higher requirements on braking systems and control methods thereof.

Firstly, the arrangement of an internal combustion engine of the new energy automobile is cancelled, so that the traditional vacuum power-assisted braking system loses the vacuum source of the internal combustion engine and cannot be directly used.

Then, with the continuous improvement of the environment sensing technology, driving assistance systems such as AEB and ACC have been widely used in automobiles, and unmanned automobiles have also been rapidly developed. However, both the driving assistance system and the unmanned vehicle are finally required to be realized through controlling the transverse and longitudinal movement of the vehicle, and the braking system as a core safety component plays the most important role.

This requires that the braking system at least fulfils the following functions: 1. the active voltage building function is realized quickly and accurately. 2. The system has the redundancy anti-failure braking capability, and still has a certain degree of braking capability under the condition of no driver intervention when the system fails.

We believe that the prior art suffers from the following disadvantages:

1. the new energy automobile cancels the arrangement of an internal combustion engine, so that the vacuum boosting brake system can only realize the vacuum degree by adding one electric vacuum pump, but the scheme is often accompanied with the problems of complex structure, large mass, large noise and short service life. And the vacuum boosting brake system can not realize the function of active drive-by-wire brake and can not meet the requirements of the intelligent automobile on the brake system.

2. At present, the most widely used new energy automobiles and intelligent plans are mainly electronic hydraulic brake systems iBooster released by the Bosey company, and the systems can meet most requirements of automobile electromotion and intelligence. However, the following problems also exist:

1) the iBooster system has a complex structure and high manufacturing cost, and is difficult to meet the requirement of a vehicle on low cost.

2) The iBooster system structure is huge, and to the special vehicle under some garden unmanned driving scenes such as motor sweeper, express delivery car, the vehicle space is less, arrange compactly, and iBooster can't satisfy low-speed special vehicle installation demand.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vehicle drive-by-wire braking system with redundant isolating valve to can also guarantee to have the redundant braking ability of certain degree on realizing the basis that the drive-by-wire was initiatively built and is braked the function, thereby improve the security of vehicle travel in-process.

Therefore, the utility model provides a vehicle drive-by-wire braking system with redundant isolating valve, including motor control assembly, initiative pressure boost subassembly, isolation control assembly and pedal formula brake master cylinder, motor control assembly includes motor, ECU and speed sensor, the initiative increases the subassembly and includes pinion, gear wheel, screw, lead screw and initiative pressure boost master cylinder, initiative pressure boost master cylinder includes first business turn over oilhole and second business turn over oilhole, isolation control assembly includes first oil circuit and the isolation solenoid valve, the redundant isolation solenoid valve that set up concatenates on first oil circuit and pressure sensor, wherein, pressure sensor is connected with the ECU electricity for detect the pressure of the brake fluid of initiative pressure boost master cylinder, the first end and the pedal formula brake master cylinder intercommunication of first oil circuit, its second end and second business turn over oilhole intercommunication, first business turn over oilhole and brake wheel cylinder intercommunication, the second oil inlet and outlet hole of the active pressurization master cylinder is communicated with a brake wheel cylinder, the isolation electromagnetic valve is in an open state in the conventional running process of the vehicle and is in a closed state in the braking process of the vehicle, and the redundant electromagnetic valve replaces the isolation electromagnetic valve to work when the isolation electromagnetic valve fails.

Further, the active pressurized main cylinder comprises a cylinder body, a piston driven by a screw rod to move in the cylinder body, and a pre-pressing spring arranged in a pressure building cavity of the cylinder body.

Further, the isolation control assembly further comprises a first check valve connected in parallel with the isolation solenoid valve and a second check valve connected in parallel with the redundant isolation solenoid valve.

Further, the pedal type brake master cylinder is replaced by a liquid storage tank.

The utility model discloses in, through the piston horizontal migration in the pressure cavity and connect the second and advance the closing of going out the outer isolation solenoid valve of oilhole and realize initiative pressure boost, under pressure sensor detected the condition that the isolation solenoid valve became invalid, thereby redundant isolation solenoid valve then can be as backup come closed realization pressure boost.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a vehicle brake-by-wire system with redundant isolation valves according to the present invention;

FIG. 2 is a mechanical drive line diagram of a vehicle brake-by-wire system with redundant isolation valves according to the present invention; and

fig. 3 is an overall operational flow diagram of a vehicle brake-by-wire system with redundant isolation valves according to the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 to 3 show some embodiments according to the invention.

As shown in fig. 1, the vehicle brake-by-wire system with redundant isolation valves of the present invention comprises: a motor control assembly 10, an active boost assembly 20, an isolation control assembly 30, and a master cylinder 40.

The motor control assembly 10 includes a motor 11, an ECU 12, and a rotation speed sensor 13. The rotation speed sensor and the ECU are positioned in the motor. The rotating speed sensor and the ECU are integrated, so that the overall size is greatly reduced, and the space required by arrangement is reduced.

The active boost assembly 20 includes a pinion 21, a bull gear 22, a nut 23, a lead screw 24, and an active boost master cylinder 25. The screw nut, the screw rod, the pinion and the bull gear are located in a shell of a speed reduction module of the active pressurizing assembly.

The actively pressurized master cylinder 25 includes a cylinder 251, a piston 252, and a return spring 253 located within a pressurized cavity. The active pressure building main cylinder runs by prepressing through the return spring, so that the piston and the lead screw are always in contact without too large gaps, and the pressure building module can be ensured not to have idle stroke in the pressure building process.

The master booster master cylinder 25 has a first oil inlet and outlet hole a1 and a second oil inlet and outlet hole a 2. The first oil inlet/outlet hole a1 communicates with the brake cylinder 50. The second oil inlet and outlet hole a2 is connected to the master cylinder 40 through an isolation control assembly. The master cylinder 40 is a pedal-type master cylinder.

The isolation control assembly comprises a first oil path 36, an isolation solenoid valve 31 arranged on the first oil path, a first check valve 32 connected with the isolation solenoid valve in parallel, a redundant isolation solenoid valve 33, a second check valve 34 connected with the redundant isolation solenoid valve in parallel, and a pressure sensor 35 used for detecting the oil pressure in the pressure building cavity. Wherein the isolation solenoid valve 13 and the redundant isolation solenoid valve 14 are connected in series.

The first oil passage 36 has a first end communicating with the reservoir tank 40 and a second end communicating with the second oil inlet/outlet hole a 2.

As shown in fig. 3, the working process of the brake-by-wire system of the vehicle is as follows:

during the normal running process of the vehicle, the isolation electromagnetic valve and the redundant isolation electromagnetic valve are in an open state, and the brake fluid is stored in the brake master cylinder, the brake pipeline, the brake wheel cylinder and the active booster master cylinder.

When the ECU receives a signal of active braking, a rotating speed signal is sent to the motor according to the braking pressure required to be realized, and meanwhile, an instruction is sent to the isolation electromagnetic valve to close the isolation electromagnetic valve.

After the ECU receives the brake-by-wire signal after the braking is started, the ECU controls the motor to start working and closes the isolation electromagnetic valve, and as shown in figure 2, force is transmitted to the piston through the motor → the pinion → the large gear → the nut → the screw rod, and the piston starts working to compress the brake fluid to generate hydraulic pressure. If the pressure sensor in the isolation control assembly detects that the hydraulic pressure is abnormal, the ECU sends an instruction to control the redundant isolation electromagnetic valve to be closed, and the redundant isolation electromagnetic valve is used as a pressure control backup to ensure that the pressure building process is normally carried out.

Meanwhile, the other oil inlet and outlet hole of the active booster master cylinder is connected with the brake wheel cylinder in series, and the brake hydraulic pressure in the active booster component is transferred to the brake wheel cylinder and converted into mechanical force through the brake wheel cylinder to drive the brake actuating mechanism to work.

The utility model discloses in, through the piston horizontal migration in the pressure cavity and connect the second and advance the closing of going out the outer isolation solenoid valve of oilhole and realize initiative pressure boost, under pressure sensor detected the condition that the isolation solenoid valve became invalid, thereby redundant isolation solenoid valve then can be as backup come closed realization pressure boost. The established brake oil pressure is transmitted to the brake wheel cylinder through the second oil inlet and outlet hole and converted into mechanical brake force to realize braking.

In one embodiment, the foot-operated brake master cylinder is replaced with a reservoir.

The utility model discloses following technological effect/advantage have:

1. the utility model provides a one set of complete initiative pressure building mechanism compares other electro-hydraulic braking systems, and the structure is simpler, has further reduced manufacturing cost, has also guaranteed the precision and the response speed of braking simultaneously.

2. The utility model discloses a establish ties two solenoid valves in the main braking system and realize the function of redundant braking. Compared with an ibooster + ESP combined system on a passenger vehicle, the combined system realizes redundant braking, is lower in cost, and can better meet the requirements of a low-speed special new energy intelligent vehicle.

3. The rotating speed sensor and the ECU are integrated, so that the overall size is greatly reduced, and the space required by arrangement is reduced.

4. The driving of the active pressurization main cylinder by adopting the return spring for prepressing ensures that the piston and the lead screw are always contacted without too large clearance, thus ensuring that the pressure building module has no idle stroke in the pressure building process.

Aiming at the brake system of the unmanned low-speed special vehicle in the closed park, the brake system must ensure the timely and accurate capability of active pressure building and long-time pressure maintaining, and meanwhile, the reliability of the brake system must also be ensured, namely, the redundant design. In addition, since such vehicles are generally low in cost and have relatively low requirements for functions such as energy recovery, the brake system of a passenger vehicle cannot be used.

The braking system meets the requirements, and has wide market prospect in the field of new energy intelligent low-speed special vehicle braking systems.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle brake-by-wire system with redundant isolation valves is characterized by comprising a motor control assembly, an active pressurization assembly, an isolation control assembly and a pedal type brake master cylinder,

the motor control assembly comprises a motor, an ECU (electronic control unit) and a rotating speed sensor, the active pressurization assembly comprises a pinion, a gearwheel, a nut, a screw rod and an active pressurization main cylinder, the active pressurization main cylinder comprises a first oil inlet and outlet hole and a second oil inlet and outlet hole,

the isolation control assembly comprises a first oil path, and an isolation electromagnetic valve, a redundant isolation electromagnetic valve and a pressure sensor which are connected in series on the first oil path, wherein the pressure sensor is electrically connected with the ECU and used for detecting the pressure of the brake fluid of the active booster master cylinder,

the first end of the first oil path is communicated with the pedal type brake master cylinder, the second end of the first oil path is communicated with the second oil inlet and outlet hole, the first oil inlet and outlet hole is communicated with the brake wheel cylinder,

the second oil inlet and outlet hole of the active pressurization master cylinder is communicated with a brake wheel cylinder, the isolation electromagnetic valve is in an open state in the vehicle running process and is in a closed state in the vehicle braking process, and the redundant isolation electromagnetic valve replaces the isolation electromagnetic valve to work when the isolation electromagnetic valve fails.

2. The vehicle brake-by-wire system according to claim 1, wherein the active pressurized master cylinder includes a cylinder, a piston driven by a lead screw to move in the cylinder, and a pre-pressure spring provided in a pressure-built cavity of the cylinder.

3. The vehicle brake-by-wire system of claim 1, wherein the isolation control assembly further comprises a first one-way valve in parallel with the isolation solenoid valve and a second one-way valve in parallel with the redundant isolation solenoid valve.

4. The vehicle brake-by-wire system of claim 1, wherein the foot-actuated brake master cylinder is replaced with a fluid reservoir.