Hydraulically coupled electro-hydraulic brake system

Abstract

The present invention relates to a hydraulically coupled electro-hydraulic braking system, aiming at solving some problems existing in the current electro-hydraulic brake system. The hydraulically coupled electro-hydraulic braking system includes a manpower hydraulic cylinder, a booster cylinder, a brake master cylinder, brake pedal, pedal stroke sensor, booster motor, booster transmission assembly, normally open solenoid valve, normally closed solenoid valve, check valve A, check valve B, hydraulic control unit HCU, hydraulic pressure sensor, an electronic control unit ECU, and other structures. The hydraulically coupled electro-hydraulic braking system has three working modes of conventional braking, active braking and failure backup, and has the structure of hydraulic cylinder. The invention adopts a novel hydraulic coupling scheme, eliminates the reaction disk structure, the pedal force of the driver and the brake assisting force are coupled through the hydraulic mode, and the control algorithm of the whole brake system is simplified because the reaction disk structure is eliminated, and the control method is convenient to control.

Description

technical field [0001] The invention relates to a brake system, in particular to a hydraulic coupling electronic hydraulic brake system. Background technique [0002] With the continuous development of automobile electrification technology and intelligent technology, the traditional vacuum-assisted hydraulic braking system is difficult to meet the requirements of electric vehicles and smart vehicles for the braking system. Electric vehicles require the braking system to have a certain decoupling capability, that is, the decoupling of the brake pedal and the hydraulic braking force, so that the braking system can cooperate with regenerative braking, recover braking energy to the maximum extent, improve the cruising range of electric vehicles, and Guarantee the driver's pedal feeling in the decoupled state; intelligent cars require the brake system to have faster response speed, more precise brake pressure control and sufficient active braking capability, which can be implemen...

AI Technical Summary

Problems solved by technology

[0004] However, there are still some problems in the current electronic hydraulic braking system. The pedal force and brake booster are usually coupled through the reaction disc. When writing the control algorithm, it is necessary to consider various factors such as the deformation of the inner and outer rings of the reaction disc. The control algorithm is complex; in realizing decoupling When using a pedal feel simulator, the number of parts of the brake system is increased and the structure is complicated, and it is difficult for the pedal feel simulator to completely simulate the same pedal feel as the traditional vacuum booster brake system; many electronic hydraulic brake systems use a complete solution In the coupling scheme, the driver is only responsible for giving the braking intention during normal braking, and cannot make full use of the driver's pedal force, and because the driver's pedal force does not participate in the actual pressure building process, the braking pressure is completely controlled by the booster motor Established, the motor performance requirements are very high, there is a problem of excessive motor current, etc.

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