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FOUR-WHEEL STEERINGSYSTEM

AMBEESH.A.S

S7 ME

4404

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Topics Covered

IntroductionWhy Four-wheel Steering (4WS) System?

Types

Mechanical

HydraulicElectro-hydraulic

Actual 4WS

Fail-safe measures

AdvantagesApplication

Conclusion

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INTRODUCTION

What is 4WS?

How does it work?

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Why Four-wheel

Steering (4WS) System?

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TypesMechanical

Hydraulic

Electro-Hydraulic

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Mechanical 4WS System

Inside a rear-steering gear box is a simple planetary gear setup

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Hydraulic 4WS System

Simple Hydraulic 4WS System

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Electro-hydraulic 4WS System

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

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Actual 4WS

Rack and pinion front steering, hydraulically

controlled

Rear-steering shaft

Vehicle speed sensors

Steering-phase control unit

Centering lock spring Solenoid valve

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Fail-safe measures

Hydraulic failure

Electrical failure

Positioning of the wheels

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Advantages of 4WS

Speed can be varied

Improved maneuverability

Slow Medium Fast

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Better handlingin tight corners

Better parking

Stability is

increased

4WS 2WS

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Application

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ConclusionAdvantageous to 2WS

Complex and expensive

Cost may drop as the system becomescommon

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