Control method of high-power hydrodynamic retarder

Abstract

The invention discloses a control method of a high-power hydrodynamic retarder, and belongs to the technical field of automobile braking equipment. The control method comprises the following steps that a controller judges whether a retarder emergency switch signal is effective or not; the controller decides whether to open the retarder or not according to the rotating speed of an engine and triesto open the retarder according to whether a retarder gear handle hard wire or a CAN switch signal is received or not; the controller further judges whether a retarder opening condition is met or not;the controller opens a subprogram and gives out initial current of a corresponding retarder electromagnetic valve according to an input condition when the retarder is tried to be opened; the controller controls the torque and gears of a gearbox and the braking torque of the retarder according to the oil temperature of the retarder; and ending process is performed, and continuing to repeat the steps (1) to (5) is carried out. Losses can be retrieved, and the safety of vehicles and passengers is guaranteed to the maximum extent; damage to the engine due to continuous overspeed is avoided; and the retarder is prevented from being damaged by high temperature.

Description

Technical field [0001] The present invention relates to a control method of a large power hydraulizing force, belonging to the technical field of automotive brake equipment. Background technique [0002] The hydraulic steering is a car aided brake device, mainly used in large passenger cars, urban bus vehicles and heavy trucks. The device is mounted between the automotive drive shaft and the transmission, rotating through the rotor and impacts the stator, at which time the stator also generates a reaction force to the rotor through the liquid force, thereby hinders the rotor to rotate and achieve no contact braking. High-power hydraulic steplers typically have 4 gear: 100%, 75%, 50%, and 25%, different gear passes through different steever solenoid valve control current, the driver can choose the required required Gear. [0003] The disclosure is the Chinese patent document of CN101837738A, which discloses a hydraulic steering drive controller and a control method thereof includi...

AI Technical Summary

Problems solved by technology

[0004] However, this control method does not provide continuous overspeed protection for the engine, and the risk of shortening the service life of the engine due to continuous overspeed is high; secondly, in emergency and special situations, the hydraulic retarder cannot be opened quickly to avoid car crashes Finally, it is only a single threshold to judge whether the oil temperature of the hydraulic retarder itself is overheated, which is not very practical for dynamic running vehicles

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