FOUR-WHEEL STEERING SYSTEM

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Presentation transcript:

FOUR-WHEEL STEERING SYSTEM Seminartopics.info

Topics Covered Introduction Why Four-wheel Steering (4WS) System? Types Mechanical Hydraulic Electro-hydraulic Actual 4WS Fail-safe measures Advantages Application Conclusion

INTRODUCTION What is 4WS? How does it work?

Why Four-wheel Steering (4WS) System?

Types Mechanical Hydraulic Electro-Hydraulic

Mechanical 4WS System Inside a rear-steering gear box is a simple planetary gear setup

Hydraulic 4WS System Simple Hydraulic 4WS System

Electro-hydraulic 4WS System An Electronically & Hydraulically controlled 4WS System using a Stepper motor & Control yoke

Actual 4WS Rack and pinion front steering, hydraulically controlled Rear-steering shaft Vehicle speed sensors Steering-phase control unit Centering lock spring Solenoid valve

Fail-safe measures Hydraulic failure Electrical failure Positioning of the wheels

Advantages of 4WS Speed can be varied Improved maneuverability Slow Medium Fast

Better handling in tight corners Better parking Stability is increased 4WS 2WS

Application

Conclusion Advantageous to 2WS Complex and expensive Cost may drop as the system becomes common

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