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This paper proposes novel high accuracy road condition estimation called Tire Grip Margin (TGM), and TGM is estimated by using dual pitman arm type steer-by-wire and lateral force sensor and estimator. In addition, we propose cornering stability control technique based on the TGM. It can help driver and vehicle before unstable state. We verify our proposed system achieves robust vehicle dynamics control...
In this paper, the robust yaw stability control based on active steering control is proposed for electric vehicles (EVs). A two degree of freedom control method by a disturbance observer is applied to control design for yaw stabilization. Moreover, the feed-forward disturbance compensator is designed to compensate unexpected yaw moment caused by torque differences between left and right driving motors...
Future electric vehicles (EVs) will be linked to the electric power system infrastructure; the vehicles will operate through frequent electric charging, as is the case with electric trains. Conventional batteries require a long recharging time; therefore, supercapacitors, rather than batteries, will play an important role in the future for charging of EVs. Recently, we manufactured small EVs powered...
A new traction control which utilizes the maximum transmissible torque estimation (MTTE) scheme to execute the anti-slip control of electric vehicles is proposed in this study. Since the function of embedded knowledge mechanism, the chassis velocity and information about tire-road conditions is unnecessary. A closed-loop observer with disturbance estimation performance is employed to enhance the steering...
This paper presents a new control algorithm that prevents wheel skidding of electric vehicles in the presence of uncertainties in tire-road conditions. An estimator of the maximum effective torque is realized by wheel velocity and input torque, which is based on a purely kinematic relationship between the wheel and the chassis. In order to enhance the stability of the control system and preserve handling...
Controlling an immeasurable state with an indirect control input is a difficult problem faced in traction control of a vehicle. Research on motion control of electric vehicles has progressed considerably, but anti-slip control has not been so sophisticated and practical because of this difficulty. Therefore, this work takes advantage of the features of motors to estimate the maximum friction force...
Motor's fast torque response is one of the advantages of electric vehicles (EVs), and the advanced anti-skid control is included in this advantage. Simulation results show that the feedback gain of wheel velocity control can be high enough to suppress the serious skid, if the actuator delay is small enough. The dynamics of wheel can be changed with this control, and the driven wheel's inertia can...
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