A control method for a composite air suspension balance bridge

Abstract

The invention relates to a method for controlling a composite air suspension balance bridge, comprising the following steps: S1. After the vehicle controller is powered on, it enters an initialization state; S2. After the initialization is completed, it enters a power-on state to keep the pressure of the air bag; S3. If the mid-bridge rising command is received and the car is parked, it will enter the time-limited inflation state to inflate the airbag and lift the mid-bridge of the car; S4. In the time-limited inflation state, determine whether the car is overloaded: When it is detected that the automobile is under heavy load, step S5 is performed; when it is detected that the automobile is unloaded or lightly loaded, step S6 is performed; S5, enter the balance bridge state, and the air bag is deflated, and the middle The bridge is lowered; S6, entering the lifting state of the middle bridge, maintaining the pressure of the air bag, and maintaining the lifting state of the middle bridge.

Description

technical field [0001] The invention relates to an automobile balance bridge suspension system, in particular to a balance bridge control method of a composite air suspension. Background technique [0002] At present, in order to improve the tire friction and fuel consumption of medium and heavy vehicles when they are unloaded or lightly loaded, the prior art generally designs the rear axle as a liftable support bridge, thereby reducing tire friction and fuel consumption. Common liftable support bridges generally include two types, namely leaf spring suspension and air suspension. Air suspension can be divided into full air suspension and composite suspension (composed of leaf spring and airbag) suspension system). [0003] In the prior art, the rear axle of medium and heavy vehicles is generally designed as a support bridge that can be lifted. When the vehicle is lightly loaded, the axle is lifted to reduce tire friction and fuel consumption. When the vehicle is heavily lo...

AI Technical Summary

Problems solved by technology

However, the short wheelbase when the rear axle is lifted makes the stability of the lift insufficient, and after the rear axle is lifted, the saddle fulcrum of the car falls behind the rear axle, and the safety of the car is not high

[0004] Moreover, in the existing system, the control method for the lifting of the axle is very limited. Generally, it can only realize two states of lifting and lowering under human operation, and the degree of automation is not high; there is a lack of certain protection measures to prevent accidents caused by misoperation. , such as in the process of heavy-duty driving, if the driver touches the lift switch by mistake, it may cause the axle to lift during driving, which will bring driving danger; in addition, in the prior art, an angle sensor is installed on the leaf spring to detect The deflection of the leaf spring can help the driver judge the loading condition of the car. This detection method has low accuracy and is prone to misjudgment, which in turn brings potential safety hazards.

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