Multi-mode electronic hydraulic brake boosting system and control method

Abstract

The invention discloses a multi-mode electronic hydraulic brake boosting system and a control method. When the power assisting system fails, an emergency mechanical braking mode is achieved through structural redundancy, under the normal power assisting mode, common braking and emergency braking are divided according to the strength requirement of a brake, and the common braking power assisting mode and the emergency active pressurizing mode are controlled respectively. Accurate assistance can be provided during general braking so that the pressure of the brake master cylinder can accurately follow the target pressure, pressure buildup of the brake master cylinder can be completed more quickly during emergency braking, braking force is output to the maximum extent, the system response timeof the emergency braking working condition is shortened, the braking capacity is improved, and traffic accidents are avoided. The design of the multi-mode power assisting system can accurately trackthe braking intention of a driver, the intelligent degree of switching between different power assisting modes is high, the rapidity and accuracy of braking response and the safety of a vehicle are improved, and the multi-mode power assisting system has very high practical application value.

Description

technical field [0001] The invention relates to the technical field of vehicle safety, in particular to a multi-mode electronic hydraulic brake boosting system and a control method. Background technique [0002] With the development of electrification and intelligence of automobiles, X-By-Wire has become a trend. Among them, the brake by wire (Brake by Wire) system can realize the decoupling between the pedal force and the wheel braking force. The braking force control has high precision and quick response, and allows the upper system to actively intervene. It has become the development direction of the future automotive braking system. The brake-by-wire system mainly includes electronic hydraulic brake (Electronic Hydraulic Brake, EHB) and electronic mechanical brake (Electronic Mechanical Brake, EMB). [0003] The EHB system can be developed based on the existing 12V power supply system and is easy to apply. It will still be the mainstream choice for commercial applicatio...

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Problems solved by technology

[0006] However, the above-mentioned existing technologies all focus on the distribution and precise control of hydraulic pressure, and the pressure distribution and cooperative control of HCU.

More importantly, in the current existing technology, in the existing hydraulic brake booster system, the driver's braking operation corresponds to the brake braking force one by one, and it is difficult to guarantee the safety of the driver when the driver is not driving properly or only relying on the driver's response. When emergencies such as vehicle safety occur, it is difficult to actively intervene in the braking system, the safety of the driver and the vehicle cannot be guaranteed, and it is difficult to realize the active safety function

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