A control method for a braking system and a hydraulic retarder

Abstract

The invention discloses a braking system and a control method for a hydraulic retarder, belonging to the technical field of new energy vehicles. The braking system includes a hydraulic retarder and a control device thereof, and the control device includes: a first air intake Valve, first exhaust valve, pressure sensor and controller; the first end of the first intake valve is used to communicate with the high-pressure air storage tank of the vehicle, and the second end is used to communicate with the air in the liquid storage tank in the hydraulic retarder The first end of the first exhaust valve is connected to the air chamber, and the second end is connected to the atmosphere; the pressure sensor is connected to the air chamber to detect the current pressure of the air chamber; the input end of the controller is connected to the pressure sensor, The output end is connected with the first intake valve and the first exhaust valve; the controller is used to control the opening or closing of the first intake valve and / or the first exhaust valve according to the detection result of the pressure sensor. The present invention controls the pressure in the air cavity through the first intake valve and the first exhaust valve, and then controls the working torque of the hydraulic retarder, thereby reducing the control cost.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a control method for a braking system and a hydraulic retarder. Background technique [0002] Hydraulic retarder, including stator, rotor, liquid storage tank, heat exchanger. The stator and the rotor are respectively equipped with blades and arranged oppositely. The stator and rotor are placed in the casing to form a working chamber. [0003] The upper part of the liquid storage tank of the hydraulic retarder is an air cavity, and the lower part stores working fluid. When the air enters the liquid storage tank, the gas pressure in the cavity increases, which will push the working fluid in the lower part of the liquid storage tank to rise through the control pipeline. Then it enters the center of the stator along the liquid inlet line, and the excess air is discharged through the float chamber. In the working state, the rotor rotates to produce centrifugal effect, ...

AI Technical Summary

Problems solved by technology

[0005] When an automobile uses a hydraulic retarder for braking, it is necessary to dynamically control the target torque of the retarder according to the working conditions. The cost of the control device and control method in the prior art is relatively high

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