scholarly journals Dynamic Ride Height Adjusting Controller of ECAS Vehicle with Random Road Disturbances

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Xing Xu ◽  
Long Chen ◽  
Liqin Sun ◽  
Xiaodong Sun
Keyword(s):  
Control System ◽  
Variable Structure ◽  
Random Disturbance ◽  
Ride Height ◽  
Structure Control ◽  
Height Control ◽  
Sliding Motion ◽  
Stochastic Nonlinear System ◽  
Road Excitation ◽  
The Mathematical Model

The ride height control system is greatly affected by the random road excitation during the ride height adjusting of the driving condition. The structure of ride height adjusting system is first analyzed, and then the mathematical model of the ride height adjusting system with the random disturbance is established as a stochastic nonlinear system. This system is decoupled using the differential geometry theory and stabilized using the Variable Structure Control (VSC) technique. The designed ride height control system converges in probability to be asymptotically stable in the sliding motion band, and the desired control law is solved to ensure the stable adjustment of the ride height system. Simulation results show that the proposed stochastic VSC method is effective for the dynamic adjusting of the ride height. Finally, the semiphysical rig test illustrates the applicability of the proposed scheme.

Variable Structure Control Strategy Research on Regenerative Braking for a Brushless DC Motor Driven Electric Bus Cruising Downhill

2014 ◽  
Vol 13 (04) ◽  
pp. 223-236 ◽  
Author(s):  
Guo-Zhu Zhao ◽  
Xing Peng
Keyword(s):  
Control System ◽  
Control Method ◽  
Variable Structure ◽  
Dc Motor ◽  
Constant Speed ◽  
Regenerative Braking ◽  
Brushless Dc Motor ◽  
Structure Control ◽  
Brushless Dc ◽  
Electric Bus

To use regenerative braking to act as an auxiliary brake to maintain the constant speed of a brushless DC motor driven electric bus (BDCMEB) on downhill based on the feature of double-loop control structure of the control method for electric vehicle traction motor and the variable structural characteristics of PWM Control System for brushless DC Motor. A double-manifold variable structure control method to control regenerative braking is proposed for the bus cruising downhill. The impact of lead-acid battery's charge acceptance ability over a long charging period on the regenerative braking force of a driving motor is analyzed. Dynamic model of the bus on long downhill is established. A double-manifold variable structure controller is designed for the DCMEB on long downhill. The simulation result shows that the control system maintains enough stability and strong robustness. It may be achieved for the bus to maintain a constant speed downhill only by regenerative braking on a smaller slope. But the dynamic process is very slow. When deceleration or a constant speed is desired on a larger slope, only by electro mechanical parallel braking can the bus track the target speed precisely and quickly.

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