Automotive teaching equipment - electronically controlled air suspension training materials
Electronic control suspension training materials
Section 1 Overview
Automobile suspension is a general term for the force transmission connection device between the body or frame and the wheel or axle. Its role mainly has the following three aspects:
(1) Work together with the tire to buffer and absorb the vibration from the wheel, so that the car runs smoothly.
(2) The driving force and braking force and its torque generated between the wheel and the road surface are transmitted to the body.
(3) Support the body on the front and rear axles and maintain the geometric relationship between the body and the wheels.
The traditional suspension system is mainly composed of springs, shock absorbers, stabilizer bars and so on. Springs are used to prevent road vibrations and wheel swings from being transmitted directly to the body, and they also help improve the tire's ability to hit the ground. The shock absorber can quickly attenuate the vibration of the spring, making the ride comfortable and improving the directional stability of the car. It is the combined characteristics of springs and shock absorbers that determine a car's ride and handling properties. However, the stiffness of the traditional mechanical spring cannot be changed. Even the variable stiffness spring has a very limited variation range, and the damping force of the traditional shock absorber cannot be changed either.
Therefore, it is impossible for a suspension composed of these conventional elements to satisfy both good ride comfort and good handling stability.
Section 2 Functions of the System
For car suspension, if the stiffness of the suspension is reduced, the smoothness of the suspension will be good, and the ride comfort of the car will be improved, but too low suspension stiffness will cause the car to yaw and pitch during driving, and damage the car. The normal driving state of the car reduces the driving stability of the car. Moreover, if only the stiffness of the suspension is reduced without changing the damping damping of the shock absorber, the ground impact force will be transmitted to the body through the shock absorber, and the ride comfort of the car will also be destroyed.
Therefore, it is best to control the stiffness of the suspension in conjunction with the control of the body height and the damping and damping control of the shock absorber, so as to effectively improve the ride comfort and driving stability of the car.
Toyota's electronically controlled air suspension system is a system that simultaneously controls spring rates, shock absorber damping and ride height. This system can greatly improve the ride comfort and driving stability of the car under various working conditions.
Section 3 Composition and Structure of the System
The electronically controlled air suspension system of Lexus LS400 is mainly performed by air spring and shock absorber assembly, air compressor, dryer, exhaust solenoid valve, height control valve, suspension ECU, height sensor, steering sensor, and suspension control. valve and throttle position sensor. The LRC switch and height control on-off switch used in the Lexus LS400 and ucFl0 have been cancelled in the ucF20, and the ucF20 has added an acceleration sensor, a suspension control actuator, a height sensor and an improvement on the air spring. Correspondingly, the suspension The control method of the rack ECU has also been improved.
