Brake by wire system with hydraulic power and control method of brake by wire system

Abstract

The invention discloses a brake by wire system with hydraulic power. A mechanical action unit of the brake by wire system with hydraulic power consists of a brake pedal, a brake master cylinder and an oil can. An electric power and pressure regulating unit is provided with a motor driven hydraulic pump. The brake master cylinder from the direction of a piston of the brake master cylinder to a piston rod of the brake master cylinder is provided with chamberII, chamber II and chamber III in sequence. The chamber III is the chamber that the piston rod is positioned in. A connected pipeline is positioned between the chamberI and the chamber II. The connected pipeline is provided with a check valve whose conducting direction is from the chamber III to the chamber I. Using the above technical scheme can reduce production costs and decrease in volume, which is beneficial to install and arrange in the vehicle, and can achieve braking in normal situation. Using the above technical scheme can also achieve quick plenum, pressure reduction and regulation control, and the governing response is fast, and the response requirement for a motor pump system as well as the requirement for a motor and ECU power are far below a scheme that requires the motor reversing quickly. A system structure of a brake by wire system with hydraulic power is more compact and costs of the whole brake system are lower.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems. More specifically, the present invention relates to brake-by-wire systems with hydraulic assist. In addition, the present invention also relates to a control method of the above braking system. Background technique [0002] The boost of the traditional automobile braking system is to use the vacuum generated by the engine or the vacuum generated by the electronic vacuum pump to realize the brake pressure build-up in the vacuum booster. Such as Figure 22 Shown, serial number 4 is described vacuum booster. When the driver brakes, the brake pedal 6 is stepped on, and the brake master cylinder 3 is driven to pass through the electronically controlled pressure regulating unit ABS / ESC2 to build up pressure on the brake 1 to generate brake fluid pressure; a vacuum booster is needed for the pedal during this process. The force is proportionally amplified, so that the driver can achie...

AI Technical Summary

Problems solved by technology

It is mainly reflected in two aspects: one is the development of new energy vehicles, such as the development of electric vehicles, so that there is no vacuuming power source for the vacuum booster on the vehicle-the engine, an electronic vacuum pump must be connected externally, and its disadvantage is that it consumes electric energy , the noise is obvious; the second is the development of active safety braking technology, for example, the vehicle can identify the expected danger after being equipped with radar waves or visual sensors, and actively build pressure braking or emergency braking to avoid collisions

Images