Motor driven electro-hydraulic brake (EHB) system with main cylinder improved

Abstract

The invention discloses a motor driven electro-hydraulic brake (EHB) system with a main cylinder improved. The motor driven EHB system comprises a brake control unit, a mechanical pedal feeling simulator, the modified brake main cylinder, a motor power brake device, an ECU, a liquid storage tank, an electromagnetic valve and a sensor. A working front cavity of the brake main cylinder is connected with a pedal push rod. During braking, front cavity oil liquid is pushed into the liquid storage tank through the normally-closed electromagnetic valve. A second working cavity of the brake main cylinder is connected with the motor power brake device. Meanwhile, a first working cavity and the second working cavity pass through an ABS / ESC module to be in hydraulic coupling with wheel cylinders. A motor is controlled to rotate to drive a ball screw mechanism so as to push a piston to move, and precise adjustment to the wheel cylinder pressure of all wheels can be achieved. By adoption of the motor driven EHB system, complete decoupling of a brake pedal and the hydraulic brake system is achieved, and a regenerative brake system can fully utilize the motor for braking to maximally recover brake energy; and regenerative braking force and hydraulic braking force are cooperatively controlled, and the requirements of various different working conditions are met.

Description

technical field [0001] The invention belongs to the technical field of automobile braking systems, and in particular relates to an electronic hydraulic braking system which has a motor-assisted braking function and is suitable for regenerative braking automobiles. Background technique [0002] With the rapid development of the economy and the gradual improvement of people's living standards, the number of cars is also increasing rapidly. But at the same time, energy and environmental issues are becoming increasingly prominent, and new energy and energy-saving vehicles have become an important direction for the development of the automotive industry. [0003] Compared with traditional vehicles, the main advantages and characteristics of new energy vehicles are to provide power sources other than internal combustion engines, improve fuel economy, and improve emission performance at the same time. An important way to improve fuel economy is to introduce regenerative braking. ...

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Problems solved by technology

For example: "An improved master cylinder dual-motor driven electronic hydraulic brake system" patent (application number is 201520159018.6, publication number is CN205044723U, publication date is 2016.02.24), although this system has many advantages, but still There are some disadvantages: the system is driven by dual motors, the mechanical structure is complicated, the volume is large, and the cost is high, and the pistons of the master cylinder are arranged in the same direction, the manufacturing process is difficult to achieve, and the layout is unreasonable

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