阅读说明：本技术 踏板感可调带自检的集成制动系统 (Integrated braking system with adjustable pedal feel and self-checking function ) 是由 郝江脉 黄朕 郑利水 杨雄 于 2019-10-17 设计创作，主要内容包括：本发明公开了一种踏板感可调带自检的集成制动系统。制动主缸上集成安装有行程位移传感器；电机连接副主缸,建压单向阀输入接到制动液油杯；从制动主缸上双腔输出两路油路,制动主缸前腔经踏板模拟器接回到建压单向阀输入和自身制动主缸前腔,制动主缸后腔经两个耦合阀接到汽车前后轮制动器的制动轮缸,耦合阀和制动轮缸之间油路装有线性进液阀；副主缸经两个建压单元供液阀接到车前后轮制动器对应的耦合阀和线性进液阀之间；建压单向阀接到制动轮缸,和每个制动轮缸之间的油路装有线性出液阀。本发明能够精确控制各个轮缸的制动力,实现快速增压,实现快速精准控制轮缸压力,很好实现模拟传统制动时地制动脚感,同时可检测系统的泄漏状况。(The invention discloses an integrated brake system with adjustable pedal feel and self-checking function. A stroke displacement sensor is integrally installed on the brake master cylinder; the motor is connected with the auxiliary main cylinder, and the pressure building one-way valve is input and connected to the brake fluid oil cup; two paths of oil paths are output from a double cavity on a brake main cylinder, a front cavity of the brake main cylinder is connected back to a pressure build-up one-way valve input and a front cavity of the brake main cylinder by a pedal simulator, a rear cavity of the brake main cylinder is connected to brake wheel cylinders of front and rear wheel brakes of an automobile by two coupling valves, and a linear liquid inlet valve is arranged on the oil path between the coupling valve and the brake wheel cylinders; the auxiliary main cylinder is connected between the coupling valve and the linear liquid inlet valve corresponding to the front and rear wheel brakes through two pressure building unit liquid supply valves; the pressure-building one-way valve is connected to the brake wheel cylinders, and a linear liquid outlet valve is arranged in an oil path between each brake wheel cylinder. The invention can accurately control the braking force of each wheel cylinder, realize quick pressurization, realize quick and accurate control of the pressure of the wheel cylinder, well realize the brake foot feeling in the process of simulating the traditional braking, and can detect the leakage condition of the system.)

1. The utility model provides an adjustable integrated braking system and detection method of taking self-checking of footboard sensation, includes master cylinder control section and pressure execution part, its characterized in that:

the master cylinder control part comprises a brake master cylinder, a pedal simulator and a brake fluid oil cup, and the pressure execution part comprises a motor, an auxiliary master cylinder, a coupling valve, a linear liquid inlet valve and a brake wheel cylinder; a stroke displacement sensor is integrally installed on the brake master cylinder; the motor is connected with the auxiliary main cylinder, the output end of the motor pushes the piston in the auxiliary main cylinder to reciprocate through the transmission component, and the input ends of the pressure build one-way valves are respectively and directly connected to the brake fluid oil cups; two paths of oil paths are respectively output from the two cavities on the brake master cylinder, the front cavity of the brake master cylinder is connected back to the input end of the pressure build-up one-way valve and the front cavity of the brake master cylinder by a pedal simulator, the rear cavity of the brake master cylinder is respectively connected to a brake wheel cylinder of a front wheel brake and a brake wheel cylinder of a rear wheel brake of an automobile by two coupling valves, and the oil paths between the coupling valves and each brake wheel cylinder are respectively connected with and provided with a linear liquid inlet valve; the auxiliary main cylinder is respectively connected between the coupling valve and the linear liquid inlet valve corresponding to the front wheel brake and between the coupling valve and the linear liquid inlet valve corresponding to the rear wheel brake through two pressure building unit liquid supply valves; the pressure-building one-way valve is directly connected to the brake wheel cylinders of the front and rear wheel brakes of the automobile, and the oil path between each brake wheel cylinder is connected with a linear liquid outlet valve.

2. The pedal feel adjustable integrated brake system with self-checking according to claim 1, wherein: the liquid supply valve and the coupling valve of the pressure building unit are both switch valves.

3. The pedal feel adjustable integrated brake system with self-checking according to claim 1, wherein: the linear liquid inlet valve and the linear liquid outlet valve are both regulating valves.

4. The pedal feel adjustable integrated brake system with self-checking according to claim 1, wherein: the pressure build-up one-way valve is a valve which is controlled by the oil pressure at two ends and only flows to the auxiliary main cylinder through the brake oil cup.

5. The pedal feel adjustable integrated brake system with self-checking according to claim 1, wherein: the pedal simulator is a nonlinear control pedal simulator and comprises a pedal simulator cylinder body (1), a pedal simulator piston (2), a piston return spring (3), a foot feel adjusting valve (4), a simulator valve (5), an oil cup (6) and a pressure sensor (7); the pedal simulator piston (2) is arranged in the pedal simulator cylinder body (1), the inner cavity of the pedal simulator cylinder body (1) is divided into two cavities of a piston front cavity and a piston rear cavity, a piston return spring (3) is arranged in the piston rear cavity of the pedal simulator cylinder body (1), the piston rear cavity of the pedal simulator cylinder body (1) is communicated with a brake fluid oil cup through a foot feel adjusting valve (4), meanwhile, the piston rear cavity of the pedal simulator cylinder body (1) is connected to a rod cavity of a brake master cylinder, and the piston front cavity of the pedal simulator cylinder body (1) is communicated with the rod cavity of the brake master cylinder through a simulator valve (5).

6. The pedal feel adjustable integrated brake system with self-checking according to claim 5, wherein: and a pressure sensor (7) is arranged on an oil pipeline between the simulator valve (5) and a master cylinder of the brake.

7. The pedal feel adjustable integrated brake system with self-checking according to claim 5, wherein: the foot feel adjusting valve (4) is a linear control electromagnetic valve and can linearly adjust the flow, and the rear brake fluid flows into the rear cavity of the piston from the oil cup (6) through the foot feel adjusting valve (4); the simulator valve (5) is an on-off valve, and the pressure brake fluid flows into the brake master cylinder from the piston front cavity through the simulator valve (5) without regulating the flow rate.

8. The pedal feel adjustable integrated brake system with self-checking according to claim 5, wherein: the simulator valve (5) is connected with a front one-way valve for brake fluid backflow in parallel, and the front one-way valve flows to a brake master cylinder from a piston front cavity under the control of specific oil pressure; the foot-sensing regulating valve (4) is connected with a rear one-way valve for brake fluid backflow in parallel, and the rear one-way valve is controlled by specific oil pressure to flow to the rear cavity of the piston from the oil cup (6).

Technical Field

The invention belongs to an intelligent driving brake control system of an automobile, and particularly relates to an integrated brake system with adjustable pedal feel and self-checking in an automobile brake system.

Background

Under the vigorous development environment of new energy automobiles, the automobiles are developing from the traditional internal combustion engine power to the direction of hybrid power and pure electric power driving. The automobile without the power of the traditional internal combustion engine does not have a vacuum source to provide vacuum assistance for a brake master cylinder in the braking process, and in order to solve the problem, the existing electric vehicle or hybrid vehicle can be additionally provided with a vacuum pump on the traditional booster to serve as the vacuum source. The method improves the cost on one hand and increases the inevitable working noise of a vacuum pump on the other hand. In addition, the traditional brake master cylinder only has the function of providing braking force, cannot meet the energy recovery function of the energy-saving automobile, and is additionally provided with an energy recovery device for realizing energy recovery, so that the cost is increased.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an integrated brake system with adjustable pedal feel and self-detection.

In order to solve the technical problems, the invention adopts the following technical scheme:

the hydraulic brake system comprises a master cylinder control part and a pressure execution part, wherein the master cylinder control part comprises a brake master cylinder, a pedal simulator and a brake hydraulic cup, and the pressure execution part comprises a motor, a secondary master cylinder, a coupling valve, a linear liquid inlet valve and a brake wheel cylinder; a stroke displacement sensor is integrally installed on the brake master cylinder; the motor is connected with the auxiliary main cylinder, the output end of the motor pushes the piston in the auxiliary main cylinder to reciprocate through the transmission component, and the input ends of the pressure build one-way valves are respectively and directly connected to the brake fluid oil cups; two paths of oil paths are respectively output from the two cavities on the brake master cylinder, the front cavity of the brake master cylinder is connected back to the input end of the pressure build-up one-way valve and the front cavity of the brake master cylinder by a pedal simulator, the rear cavity of the brake master cylinder is respectively connected to a brake wheel cylinder of a front wheel brake and a brake wheel cylinder of a rear wheel brake of an automobile by two coupling valves, and the oil paths between the coupling valves and each brake wheel cylinder are respectively connected with and provided with a linear liquid inlet valve; the auxiliary main cylinder is respectively connected between the coupling valve and the linear liquid inlet valve corresponding to the front wheel brake and between the coupling valve and the linear liquid inlet valve corresponding to the rear wheel brake through two pressure building unit liquid supply valves; the pressure-building one-way valve is directly connected to the brake wheel cylinders of the front and rear wheel brakes of the automobile, and the oil path between each brake wheel cylinder is connected with a linear liquid outlet valve.

The master cylinder control part of the invention can realize nonlinear brake feel by nonlinear regulation and simulation of the brake feel in an electrohydraulic matching control mode; the pressure executing portion provides rapid and accurate wheel cylinder pressure control and adjustment.

The liquid supply valve and the coupling valve of the pressure building unit are both switch valves.

The linear liquid inlet valve and the linear liquid outlet valve are both regulating valves.

The pressure build-up one-way valve is a valve which is controlled by the oil pressure at two ends and only flows to the auxiliary main cylinder through the brake oil cup.

The pedal simulator is a nonlinear control pedal simulator and comprises a pedal simulator cylinder body, a pedal simulator piston, a piston return spring, a foot feeling adjusting valve, a simulator valve, an oil cup and a pressure sensor; the pedal simulator piston is arranged in a pedal simulator cylinder body, the inner cavity of the pedal simulator cylinder body is divided into two cavities of a piston front cavity and a piston rear cavity, a piston return spring is arranged in the piston rear cavity of the pedal simulator cylinder body, the piston rear cavity of the pedal simulator cylinder body is communicated with a brake fluid cup through a foot feel adjusting valve, meanwhile, the piston rear cavity of the pedal simulator cylinder body is connected to a rod cavity of a brake master cylinder, and the piston front cavity of the pedal simulator cylinder body is connected and communicated with the rod cavity of the brake master cylinder through a simulator valve.

And a pressure sensor is arranged on an oil pipeline between the simulator valve and a master cylinder of the brake.

The foot feeling regulating valve is a linear control electromagnetic valve and can linearly regulate the flow, and the rear brake fluid flows into the rear cavity of the piston from the oil cup through the foot feeling regulating valve; the simulator valve is a switching valve, and the pressure brake fluid flows into the brake master cylinder from the piston front chamber through the simulator valve without regulating the flow rate.

The simulator valve is connected with a front one-way valve for brake fluid backflow in parallel, and the front one-way valve flows to a brake master cylinder from a piston front cavity under the control of specific oil pressure; the foot-sensing regulating valve is connected with a rear one-way valve for brake fluid backflow in parallel, and the rear one-way valve flows to the rear cavity of the piston from the oil cup under the control of specific oil pressure.

The pedal simulator can simulate the foot feel of the traditional brake pedal, a pedal simulator foot feel regulating valve is arranged on the pedal simulator and used for simulating the brake foot feel in different states, and the nonlinear control of the brake pedal simulation can be realized through electro-hydraulic cooperation.

The invention has the beneficial effects that:

the invention adopts the technical scheme that the pressure execution part provides rapid and accurate wheel cylinder pressure control.

Further, after the pressure in the brake wheel cylinder is controlled to be specific by the linear liquid inlet valve, the braking force supplement in the energy recovery state can be realized. And the real-time change of the wheel cylinder pressure is realized in the energy recovery process, and the energy recovery efficiency is improved. Meanwhile, the anti-lock wheel and vehicle body stabilizing system can be realized on the basis, and a good expansion platform is provided for the expansion function of intelligent driving.

Drawings

The invention is further described with reference to the accompanying drawings and the detailed description below:

FIG. 1 is an operating state diagram of an integrated brake system;

FIG. 2 is an operating state diagram of a conventional boost condition;

FIG. 3 is a diagram showing an operation state in a conventional decompression state;

FIG. 4 is an operating state diagram of an active independent boost state;

FIG. 5 is a diagram of the operating conditions of the active independent decompression regime;

FIG. 6 is a state diagram of the operation of the fail brake state brake;

fig. 7 is a first operation state diagram of the leak detection of the product oil path.

Fig. 8 is a second operation state diagram of the leak detection of the product oil path.

Fig. 9 is a schematic diagram of the overall structure of the nonlinear control pedal simulator.

Fig. 10 is a graph of simulated foot feel PV characteristics of the nonlinear control pedal simulator.

Fig. 11 is a control flow rate linear characteristic diagram of a pedal simulator foot-feel adjustment valve in a nonlinear control pedal simulator.

Fig. 12 is a flowchart of the overall control of the nonlinear control pedal simulator.

FIG. 13 is a schematic diagram of the operation of the components of the non-linear control pedal simulator during a brake-down maneuver.

FIG. 14 is a schematic diagram of the operation of the components of the non-linear control pedal simulator when driving up or maintaining a braking process.

In the figure: the pedal simulator comprises a pedal simulator cylinder body 1, a pedal simulator piston 2, a piston return spring 3, a foot feel adjusting valve 4, a simulator valve 5, an oil cup 6 and a pressure sensor 7.

Detailed Description

The invention is further illustrated by the following figures and examples.

As shown in fig. 1, the brake system comprises a master cylinder control part and a pressure execution part, wherein the master cylinder control part comprises a brake master cylinder, a pedal simulator and a brake fluid cup, the pressure execution part comprises a motor, a secondary master cylinder, a coupling valve, a linear liquid inlet valve and a brake wheel cylinder, and the motor is a brushless motor; a stroke displacement sensor is integrally installed on the brake master cylinder and used for measuring the moving depth and speed of a piston pedal on the brake master cylinder; the pressure building unit is composed of a brushless motor and an auxiliary main cylinder, the motor is connected with the auxiliary main cylinder, the output end of the motor pushes a piston in the auxiliary main cylinder to reciprocate through a transmission component, the rear cavity of the auxiliary main cylinder is connected to the input end of a pressure building one-way valve, and the input ends of the pressure building one-way valves are respectively and directly connected to brake fluid oil cups; two paths of oil paths are respectively output from two cavities on a brake main cylinder, a front cavity of the brake main cylinder is connected back to the input end of a pressure build-up check valve and the front cavity of the brake main cylinder by a pedal simulator, a rear cavity of the brake main cylinder is connected with a pressure sensor, the rear cavity of the brake main cylinder is respectively connected with a brake wheel cylinder of a front wheel brake and a brake wheel cylinder of a rear wheel brake of an automobile by two coupling valves, linear liquid inlet valves are respectively connected and mounted on the oil path between the coupling valves and each brake wheel cylinder, each linear liquid inlet valve is connected with a check valve for returning oil in parallel, and the output end of a liquid supply valve of a pressure build-up unit is connected between the coupling; the rear cavity of the auxiliary main cylinder is respectively connected between the coupling valve and the linear liquid inlet valve corresponding to the front wheel brake and between the coupling valve and the linear liquid inlet valve corresponding to the front wheel brake through two pressure building unit liquid supply valves; the pressure-building one-way valve is directly connected to the brake wheel cylinders of the front and rear wheel brakes of the automobile, and the oil path between each brake wheel cylinder is connected with a linear liquid outlet valve. The front cavity of the brake main cylinder is closer to one side with the rod, and the rear cavity is closer to one side without the rod. Both the front and rear chambers are pressure-establishing chambers.

And the liquid supply valve and the coupling valve of the pressure building unit are both switch valves. The linear liquid inlet valve and the linear liquid outlet valve are both regulating valves. The pressure build-up check valve is a valve which is controlled by the oil pressure at two ends and only flows to the auxiliary main cylinder through the brake oil cup.