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4 wheel steering

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it's all about 4 wheel steering

Published in: Automotive
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4 wheel steering

  1. 1. SUBMITTED TO :- Dr. Ashish Sharma SUBMITTED BY:- INDRESH BHARGAVA SAURABH MISHRA ABHAR SHARMA BRAJ MOHAN TOMAR GUIDED BY:- Prof. C.S. Koli
  2. 2. Introduction • Four wheel steering is a system that allows the rear wheels to turn for maneuvering, rather than just follow the front wheels. • It is a system employed by some vehicles to improve steering response, increase vehicle stability while maneuvering at high speed, or to decrease turning radius at low speed.
  3. 3. Controling rear wheels • At slow speeds, the rear wheels are turned in the opposite direction of the front wheels. This can lessen the turning radius by approximately 20%. rear wheels are turned in opposite direction of front wheels
  4. 4. • At faster speeds on the highway, the rear wheels are turned in the same direction as the front wheels. This improves lane changing maneuverability and is particularly beneficial for vehicles towing a trailer. all four wheels are turned in same direction
  5. 5. Types of four-wheel steering • 1. Mechanical 4WS • 2. Hydraulic 4WS • 3. Electro/hydraulic 4WS .
  6. 6. • The mechanical 4WS uses two separate steering gears to control the front and rear wheels. • The hydraulic 4WS uses a two-way hydraulic cylinder to turn both the wheels in the same direction. It is not possible to turn them in the opposite direction. • The electro/hydraulic 4WS combine computer electronic controls with hydraulics to make the system sensitive to both steering angle and road speeds
  7. 7. WHY FOUR-WHEEL STEERING SYSTEM
  8. 8. • a vehicle requires less driver input for any steering As with two-wheel steer vehicles, tire grip holds the four wheels on the road. when the driver turns the wheel slightly, all four wheels react to the steering input, causing slip angles to form at all four wheels. • The entire vehicle moves in one direction rather than the rear half attempting to catch up to the front. • There is also less sway when the wheels are turned back to a straight-ahead position. The vehicle responds more quickly to steering input because rear wheel lag is eliminated.
  9. 9. 1 3 2 2 2 1 2a 3 2b 2 2a 4WS Parking 2 1 3 2 2 MerMitos:bility in crowded environment  safety in driving / parking  Stable driving The Chinese University of Hong Kong MERITS
  10. 10. CONCLUSION • it has got cornering capability, steering response, line stability, lane changing and low-speed maneuverability. • , 4WS is complex and expensive. Currently the vehicle with four wheel steering is more than vehicle with the conventional two wheel steering. • it is growing in popularity and it is likely to and more new vehicles. • As the systems become more commonplace four wheel steering will drop.

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