Energy feedback active braking system and control method with fail-safe capability

Abstract

The invention relates to an energy feedback type active brake system with failure protection capability and a control method. The energy feedback type active brake system with the failure protection capability comprises an oil cup, a pedal power assisting mechanism, a brake master cylinder, a brake pedal, a pedal simulator, a servo pressure control module, a brake wheel cylinder and a braking controller; a mechanical input end of the brake master cylinder is connected with the brake pedal through the pedal power assisting mechanism; an inlet of the brake main cylinder is connected with the oilcup through an oil passage; an outlet of the brake main cylinder is correspondingly connected with the pedal simulator and the brake wheel cylinder through the servo pressure control module; the servo pressure control module is connected with the oil cup through an oil passage and is also connected with the braking controller through a signal wire; and the braking controller is used for controlling the servo pressure control module to realize switching of the system among an active pressure control state, a brake energy recovery state and a failure protection state. The energy feedback type active brake system with the failure protection capability can be widely applied to the field of vehicle hydraulic active braking control.

Description

technical field [0001] The present invention relates to a vehicle hydraulic active braking system and its control method, in particular to an energy feedback active braking system with failure protection capability and its control method. The system has the functions of active braking and braking energy recovery , and has non-fading failsafe capability. Background technique [0002] Electrification and intelligence have become an important direction of automobile research and development. Electric vehicles and intelligent driving vehicles can significantly improve vehicle energy economy and driving safety, and bring great convenience to drivers and traffic. However, various new technologies also bring new challenges to the research and development of automobile chassis, especially the braking system. For example, the braking energy feedback system assembled by electric vehicles will recover the mechanical energy of the vehicle during the deceleration process, but the hydrau...

AI Technical Summary

Problems solved by technology

[0003] At present, the hydraulic braking system with active braking function proposed abroad is mainly divided into three categories: the first category is the active hydraulic braking system based on high-voltage energy storage unit and linear solenoid valve, the most representative product is Bosch's SBC system and Toyota's ECB system, these systems have complex structure, cumbersome control, and high cost, the most important thing is that their failure protection ability is very poor

The second category is the hydraulic braking system based on the vehicle dynamics control system (Electronic Stability Program). The most representative products are Bosch's ESP-hev and Continental's MK100 system. Although the structures of these systems are relatively simple, However, the hydraulic pump and motor need to be redesigned to enhance its active pressurization capability. However, due to the limitation of the working principle, the active pressure build-up time is still long, and the response ability of active braking is poor.

The third category is the active braking system with master cylinder boosting capability. The most representative products are Bosch’s iBooster system and Toyota’s third-generation ECB system. These systems have more complex structures and require high machining accuracy. Larger volume, more difficult to process and assemble

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