Decoupled electromechanical hydraulic integrated brake boosting system

Abstract

The invention relates to a decoupled electromechanical hydraulic integrated brake boosting system. The system comprises an electronic control unit (ECU), an oil can and a hydraulic unit, the hydraulicunit comprises a brake master cylinder, a pedal feeling simulator, a stroke sensor, a boosting master cylinder and a transmission mechanism connected with a piston of the boosting master cylinder, the inner cavity of the brake master cylinder is divided into a first working cavity and a second working cavity by a first piston and a second piston, the first working cavity is connected with a firstnormally closed valve and a first normally open valve, the first normally-closed valve is connected with a pedal feeling simulator, the second working cavity is connected with a second normally-openvalve, the inner cavity of the boosting master cylinder is connected with a second normally-closed valve and a third normally-closed valve, the first normally-open valve and the second normally-closedvalve are both connected with the first output port of the hydraulic unit, and the second normally-open valve and the third normally-closed valve are both connected with the second output port of thehydraulic unit. The brake master cylinder with a small cylinder diameter is adopted, so when the brake master cylinder fails, higher brake pressure can be established through the same pedal force, larger deceleration is achieved, and recovery of all brake energy is achieved.

Description

technical field [0001] The invention relates to a brake booster system, in particular to a decoupled electromechanical-hydraulic integrated brake booster system. Background technique [0002] With the increasing requirements for energy saving and environmental protection, and the continuous development of vehicle electrification 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 cannot provide a vacuum source like traditional internal combustion engine vehicles. The use of vacuum boosters requires additional electronic vacuum pumps. Electronic vacuum pumps will increase energy consumption, cause vacuum noise, and their life is difficult to meet the life requirements of the entire vehicle. At the same time, electric vehicles require braking systems. A certain decoupling capability is used to maximize the recovery of braking ...

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Problems solved by technology

[0004] However, the current electro-hydraulic power-assisted braking system also has some problems. In some systems, the pedal force and power assist are coupled through the reaction disc, which is large in size and complex in structure. It requires complex control algorithms to ensure the pedal feel, and it cannot be decoupled by itself. It is necessary to cooperate with other systems to achieve greater braking energy recovery. In addition, some electro-hydraulic booster systems are decoupled through gaps and pedal simulators. This system completely relies on springs as pedal simulators and needs to limit the spring force, but the pedals It feels that the simulated spring will cause the pedal force to be light and cause pedal force loss, and the pedal does not have the braking hysteresis of the traditional system. At the same time, in the failure mode, the pedal stroke will be greatly increased, and it is difficult to provide sufficient braking force

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