Control of the motorized active suspension damper for good ride quality

Abstract

This paper presents a control algorithm for the motorized active suspension damper. The control algorithm consists of supervisory, upper-level and lower-level controllers. The supervisory controller determines the control modes, such as the passive mode, the roll mode and the body acceleration mode. The upper-level controller computes the damping force using linear quadratic control theory. The actuator input is determined by the lower-level controller. Three state estimators, namely the vehicle body’s velocity estimator, the suspension state estimator and the friction estimator, are proposed to estimate the sprung-mass and unsprung-mass velocities, the tyre deflection, the roll angle, the roll rate and the friction. The performance of the proposed control algorithm was evaluated via simulations and vehicle tests. It was shown from both simulations and vehicle tests that the proposed control algorithm can improve the ride quality using a motorized active suspension damper.

Motorized vehicle active suspension damper control with dynamic friction and actuator delay compensation for a better ride quality

“…12 The dynamic friction and the actuator delay lead to a significant increase in the power consumption and also degrade the performance of the actuator, thus resulting in a deterioration in the energy efficiency.…”

Mode control of motorized active suspension damper for ride quality and energy efficiency

“…Lack of effective research results motivates this Yi et al [6] proposed a system to control semi-active suspensions since it has advantages of both active and passive suspensions. It is well known that semi-active suspensions provide better ride comfort compared to passive suspensions and more affordable with less energy consumption than active suspensions [7]. Even though these aspects, semi-active system performance cannot be equivalent to active systems.…”

“…It is well known that Intensive research has been done in order to validate half car suspension control algorithm [7], [11]. The authors in [7] conducted simulations by implementing half car control algorithm into just rear half of the passenger vehicle.…”

“…The authors in [7] conducted simulations by implementing half car control algorithm into just rear half of the passenger vehicle. However, since the algorithm is not implemented on the rest half of the vehicle, front half-side, it is hard to say that the algorithm shows the best ride quality compared to results of full car suspension control.…”

Hybrid model predictive control of damping multi-mode switching damper for vehicle suspensions

“…Suspension system plays an important role in providing a high level of ride comfort by isolating the vehicle body from road irregularities and improving road holding capacity by preventing the wheel from loosing road contact [1][2][3]. It is well known that these are conflicting requirements and many studies have shown that this conflict can be eased by using controlled suspension systems instead of passive ones [4,5].…”