Production cars are designed to understeer and rarely do they over steer. If a car could automati... more Production cars are designed to understeer and rarely do they over steer. If a car could automatically compensate for an understeer/over steer problem, the driver would enjoy nearly neutral steering under varying operating conditions. Four-wheel steering is a serious effort on the part of automotive design engineers to provide near-neutral steering. Also in situations like low speed cornering, vehicle parking and driving in city conditions with heavy traffic in tight spaces, driving would be very difficult due to vehicle's larger wheelbase and track width. Hence there is a requirement of a mechanism which result in less turning radius and it can be achieved by implementing four wheel steering mechanism instead of regular two wheel steering. Our 4 Wheel Steering System gives 39.56% reduction in turning circle radius of a hatchback which is reduced from 4.6 m to 2.78 m, considering Maruti Suzuki ALTO 800 as a standard car for our calculationswhich gives much better maneuverability and control on the car even while driving at high speeds Nomenclature L-Wheelbase (mm) R-Turning radius (mm) a 2 -Distance of CG from rear axle (mm) δ if -Inner angle of front tire (degree) δ of -Outer angle of front tire (degree) δ ir-Inner angle of rear tire (degree) δ if Outer angle of rear tire (degree) R 1 -Distance between instantaneous centre and the axis of the vehicle (mm) W f -Load on front axle (kg) W -Total weight of car (kg) C 1 -Distance of instantaneous centre from front axle axis (mm) C 2 -Distance of instantaneous centre from rear axle axis (mm) w f -Front track width (mm) w r -Rear track width (mm) δ -Total steering angle of the vehicle (degree) δ i -Total inner angle of the vehicle (degree) δ o -Total outer angle of the vehicle (degree)
Production cars are designed to understeer and rarely do they over steer. If a car could automati... more Production cars are designed to understeer and rarely do they over steer. If a car could automatically compensate for an understeer/over steer problem, the driver would enjoy nearly neutral steering under varying operating conditions. Four-wheel steering is a serious effort on the part of automotive design engineers to provide near-neutral steering. Also in situations like low speed cornering, vehicle parking and driving in city conditions with heavy traffic in tight spaces, driving would be very difficult due to vehicle's larger wheelbase and track width. Hence there is a requirement of a mechanism which result in less turning radius and it can be achieved by implementing four wheel steering mechanism instead of regular two wheel steering. Our 4 Wheel Steering System gives 39.56% reduction in turning circle radius of a hatchback which is reduced from 4.6 m to 2.78 m, considering Maruti Suzuki ALTO 800 as a standard car for our calculationswhich gives much better maneuverability and control on the car even while driving at high speeds Nomenclature L-Wheelbase (mm) R-Turning radius (mm) a 2 -Distance of CG from rear axle (mm) δ if -Inner angle of front tire (degree) δ of -Outer angle of front tire (degree) δ ir-Inner angle of rear tire (degree) δ if Outer angle of rear tire (degree) R 1 -Distance between instantaneous centre and the axis of the vehicle (mm) W f -Load on front axle (kg) W -Total weight of car (kg) C 1 -Distance of instantaneous centre from front axle axis (mm) C 2 -Distance of instantaneous centre from rear axle axis (mm) w f -Front track width (mm) w r -Rear track width (mm) δ -Total steering angle of the vehicle (degree) δ i -Total inner angle of the vehicle (degree) δ o -Total outer angle of the vehicle (degree)
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