FOUR-WHEEL STEERING SYSTEM - PowerPoint PPT Presentation

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FOUR-WHEEL STEERING SYSTEM

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FOUR-WHEEL STEERING SYSTEM Seminartopics.info * Topics Covered Introduction Why Four-wheel Steering (4WS) System? Types Mechanical Hydraulic ... – PowerPoint PPT presentation

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Title: FOUR-WHEEL STEERING SYSTEM


1
FOUR-WHEEL STEERING SYSTEM
  • Seminartopics.info

2
Topics Covered
  • Introduction
  • Why Four-wheel Steering (4WS) System?
  • Types
  • Mechanical
  • Hydraulic
  • Electro-hydraulic
  • Actual 4WS
  • Fail-safe measures
  • Advantages
  • Application
  • Conclusion

3
INTRODUCTION
  • What is 4WS?
  • How does it work?

4
Why Four-wheel Steering (4WS) System?
5
Types
  • Mechanical
  • Hydraulic
  • Electro-Hydraulic

6
Mechanical 4WS System
Inside a rear-steering gear box is a simple
planetary gear setup
7
Hydraulic 4WS System
Simple Hydraulic 4WS System
8
Electro-hydraulic 4WS System
An Electronically Hydraulically controlled 4WS
System using a Stepper motor Control yoke
9
Actual 4WS
  • Rack and pinion front steering, hydraulically
    controlled
  • Rear-steering shaft
  • Vehicle speed sensors
  • Steering-phase control unit
  • Centering lock spring
  • Solenoid valve

10
Fail-safe measures
  • Hydraulic failure
  • Electrical failure
  • Positioning of the wheels

11
Advantages of 4WS
  • Speed can be varied
  • Improved maneuverability

Slow
Medium Fast
12
  • Better handling in tight corners
  • Better parking
  • Stability is increased

4WS 2WS
13
Application
14
Conclusion
  • Advantageous to 2WS
  • Complex and expensive
  • Cost may drop as the system becomes common

15
THANK YOU
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