Completely decoupled dual-backup electronic hydraulic braking system

Abstract

The invention discloses a completely decoupled dual-backup electronic hydraulic braking system. The system comprises a pedal sense simulator, a first assisted pressure buildup cylinder, a second assisted pressure buildup cylinder, a brake master cylinder, a liquid storage tank, a hydraulic control unit, a first electronic control unit and a second electronic control unit, wherein the pedal sense simulator is communicated with the brake master cylinder and the liquid storage tank through pipelines respectively, a first electromagnetic valve is arranged on the communicating pipelines, connectedwith the second electronic control unit and controlled to work by the second electronic control unit, the brake master cylinder is communicated with the first assisted pressure buildup cylinder and the second assisted pressure buildup cylinder through pipelines respectively, and a second electromagnetic valve is arranged on the communicating pipelines, connected with the first electronic control unit and controlled to work by the first electronic control unit. The system has the beneficial effect as follows: functions of active braking, failure backup, brake energy recovery and the like can berealized, active control technologies such as ESP (electronic stability program), ACC (self-adaptive cruise control) and the like can also be effectively integrated, and intelligent control of vehicles is realized.

Description

[0001] The invention relates to a hydraulic braking system, in particular to a completely decoupled double-backup electronic hydraulic braking system. Background technique [0002] At present, with the continuous development of vehicle intelligence and electrification technology, the traditional vacuum booster braking system is difficult to meet the requirements of smart vehicles and electric vehicles on the braking system. Smart cars require the brake system to have more precise brake pressure control capability, faster response speed and sufficient active braking capability. Only with these conditions can it be used as the underlying actuator of the intelligent driving assistance system. Electric vehicles require the braking system to have a certain decoupling capability, that is, the decoupling of the brake pedal force and the motor assist, so that the braking system can cooperate with regenerative braking, recover braking energy to the maximum extent, improve the cruising r...

AI Technical Summary

Problems solved by technology

[0004] However, the current electronic hydraulic braking system generally adopts no decoupling or partial decoupling scheme, the decoupling ability is limited, and the regenerative braking ability of electric vehicles cannot be fully utilized, and the braking energy can be recovered to the maximum extent; In the electronic hydraulic braking system, a single failure backup circuit is generally used. When the electronic components or transmission parts fail, the system can only build pressure by the driver stepping on the brake pedal, which has poor braking efficiency and relatively large brake pedal resistance.

In the level of automatic driving developed by SAE International, the International Society of Automotive Engineers, intelligent driving assistance systems above L3 require dual redundant backup circuits, so a single failure backup system cannot meet the needs of fully autonomous smart cars in the future

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