Ride Height Control of Trucks with Electrically Controlled Air Suspension Based on PID/PWM Algorithm
The truck with Electrically Controlled Air Suspension(ECAS) could reduce the loss of goods by setting running height when transporting, and to enhance the loading &unloading efficiency, a height modulating model was built by combining the theories of thermodynamics of variable-mass charging-discharging system and the vehicle kinetics. To solve such problems as “over-charging”, “over-discharging” and surging, a height control strategy of variable integral PID/PWM was proposed and its controller was developed base on the Freescale single chip. Finally the semi-physical rig was built for simulating the truck with the height controller, and the testing results show that the designed control system satisfies the requirement of height modulation.
X. Xu et al., "Ride Height Control of Trucks with Electrically Controlled Air Suspension Based on PID/PWM Algorithm", Applied Mechanics and Materials, Vol. 39, pp. 498-503, 2011