G-Vectoring, New Vehicle Dynamics Control Technology for Safe Driving

INTRODUCTION A smooth driving style that reduces the unnecessary consumption of gasoline and emission of exhaust gases by avoiding rapid acceleration and sudden braking has been recommended in recent years as a response to the growing severity of global environmental problems. Manufacturers of the latest environmental vehicles are also taking the initiative Makoto Yamakado, Dr. Eng. Junya Takahashi, Dr. Eng. Shinjiro Saito Masato Abe, Prof., Dr. Eng. OVERVIEW: Hitachi together with the Kanagawa Institute of Technology has developed a world-first technology for vehicle dynamics control that achieves smooth and stable cornering by automatically controlling longitudinal acceleration and deceleration based on how the driver turns the steering wheel as the vehicle travels around a corner. A strong correlation between longitudinal acceleration and lateral jerk can be found in the smooth driving of expert drivers, and this has been formalized in the equation (acceleration command value) = (lateral jerk) × (vehiclespecific gain) and given the name “G-Vectoring Control.” G-Vectoring Control achieves safe and comfortable driving and is good for the environment because it minimizes energy loss and tire wear. It does this by rotating the combined vehicle acceleration vector (G) seamlessly about the center of the vehicle (vectoring), where this acceleration vector (G) is made up of components longitudinal and lateral to the vehicle. Hitachi is extending the use of this technology by applying it in various different systems where it is used as the underlying technology for vehicle dynamics control.