A Control Method of High Power Hydraulic Retarder

Abstract

The invention discloses a control method of a high-power hydraulic retarder, which belongs to the technical field of automobile braking equipment. The method includes the following steps: the controller judges whether the emergency switch signal of the retarder is valid; the controller decides whether to open the retarder according to the engine speed, and then tries to open the retarder according to whether the hard line of the retarder gear handle or the CAN switch signal is received; The controller further judges whether the retarder opening condition is satisfied; the controller opens the subroutine, and gives the initial current of the corresponding retarder solenoid valve according to the input conditions when the retarder is tried to open; The oil temperature of the gearbox is high or low, the torque and gear position of the control gearbox, and the braking torque of the retarder; when finished, continue to repeat steps (1) to (5). It can recover losses and maximize the safety of vehicles and passengers; avoid engine damage caused by continuous overspeed; avoid retarder damage due to high temperature.

Description

technical field [0001] The invention relates to a control method of a high-power hydraulic retarder, which belongs to the technical field of automobile brake equipment. Background technique [0002] Hydraulic retarder is an auxiliary braking device for automobiles, mainly used in large passenger cars, urban public transport vehicles and heavy trucks. The device is installed between the car transmission shaft and the gearbox. The rotor drives the hydraulic rotation and impacts the stator. At this time, the stator will also generate a reaction force to act on the rotor through the hydraulic force, thereby hindering the rotation of the rotor and realizing non-contact braking. High-power hydraulic retarders are usually set with 4 gears: 100%, 75%, 50% and 25%. Different gears control the current through different retarder solenoid valves, and the driver can choose the required gear according to the specific situation. stalls. [0003] The Chinese patent document with the publi...

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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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