Vehicle direct-drive pump control brake unit and control method

Abstract

The invention relates to a vehicle direct-drive pump control brake unit and a control method. The vehicle direct-drive pump control brake unit comprises a driver, a servo motor, a bidirectional hydraulic pump, a low-pressure energy accumulator, a disc brake assembly, a pressure sensor and a brake controller. The unit is characterized in that the brake controller outputs a control signal to the driver according to a brake force demand and a feedback signal of the pressure sensor so as to control the servo motor, and an output shaft of the servo motor directly drives the bidirectional hydraulicpump; a forward liquid outlet of the two-way hydraulic pump is communicated with the brake wheel cylinder, and a forward liquid inlet of the two-way hydraulic pump is communicated with the low-pressure energy accumulator. In the pressurizing process, the servo motor rotates forwards, the torque is increased, and the pressure of the brake wheel cylinder rises; in the pressure maintaining process, the servo motor outputs constant torque, and the pressure of the brake wheel cylinder is kept unchanged; when the pressure reduction process or braking is finished, the servo electricity is in a free state, and the pressure of the brake wheel cylinder is reduced. The advantages of electric direct drive and pump control direct drive are combined, and the problems that an existing brake-by-wire system is complex in hydraulic pipeline, high in valve control hydraulic system energy consumption and the like are solved.

Description

technical field [0001] The invention relates to the technical field of automotive brake-by-wire, in particular to a pump-controlled brake unit. Background technique [0002] After more than 100 years of innovation and development in the automotive industry, the traditional hydraulic brake system using mechanical direct connection does not meet the development needs of automotive electrification. Brake-by-wire (Brake-By-Wire) has become the main development direction of automotive brake systems. [0003] Brake-by-wire systems include two types: hydraulic brake systems by wire and mechanical brake systems by wire. Among them, the wire-controlled mechanical brake system completely abandons hydraulic components, has no mechanical backup, and uses power as the energy source, but its development still faces many problems such as motors, power supplies, safety and cost; the wire-controlled hydraulic brake system is relatively Mechanical braking systems are easier to implement, les...

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Problems solved by technology

[0005] The purpose of designing a direct-drive pump control brake unit and control method for vehicles is to use the output shaft of the servo motor to directly drive the bidirectional hydraulic pump, the forward liquid outlet of the bidirectional hydraulic pump communicates with the brake wheel cylinder, and the hydraulic pump directly drives the wheel. The cylinder piston, the forward liquid inlet is connected with the low-pressure accumulator to realize the control of the wheel cylinder pressure, combined with the advantages of electric direct drive and pump-controlled direct drive, it solves the problem of complex hydraulic pipeline and valve-controlled hydraulic pressure in the existing brake-by-wire system. Problems such as high system energy consumption

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