Saitama, Japan
Saitama, Japan

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Wada M.,Tokyo University of Agriculture and Technology | Kameda F.,Nissin Jidosya Kogyo Co. | Saito Y.,Nissin Jidosya Kogyo Co.
2012 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2012 | Year: 2012

This paper presents a system design of a joystick car drive system for safe and comfortable user interface. The joystick drive system allows a handicapped person to drive a car by using a joystick with small force and short stroke. However when a vehicle running in a very high speed, a wrong joystick operation, such as a sudden and wide steering, results in a car accident quite easily. The other hand, quite sensitive steering control is required around the center of steering angle when a car runs along a straight line. When parking a car, large steering angle provides easier parking maneuverings to a driver. To realize these multiple requirements and solve some problems for the steering control, we propose a steering control method with variable steering sensitivity and steering limitation based on a vehicle velocity. Addition to the steering control, pedal actuating system enables to controls acceleration or deceleration of a car by the joystick operation in back and forth direction. To reinforce the safety of a car in case of system fault, an emergency brake system is also developed which is actuated by accumulated high pressure air. © 2012 IEEE.


Wada M.,Tokyo University of Agriculture and Technology | Kameda F.,Nissin Jidosya Kogyo Co. | Saito Y.,Nissin Jidosya Kogyo Co.
IECON Proceedings (Industrial Electronics Conference) | Year: 2013

This paper presents a steering-wheel control system with a joystick interface for stable car driving at a high speed. The joystick drive system allows a handicapped person to drive a car using a joystick interface with a small force and short stroke. However when a vehicle running at a very high speed, a wrong joystick operation, such as a sudden and wide steering, results in a car accident quite easily. The additional problem is that a car could not be controlled stable if joystick sensitivity is not appropriate especially at high speed. The other hand when parking a car, a large steering angle provides easy parking maneuvers to a driver. To realize these multiple requirements and solve some problems for the steering control, we propose a steering control system with a steering angle restriction and a variable sensitivity function based on vehicle velocity information. In this paper, some types of variable sensitivity methods are proposed and one of them is selected through driving tests by a human driver. By the variable sensitivity function, approx. 85km/h driving is realized. © 2013 IEEE.

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