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DEVELOPMENT OF
AUTOMOBILE TECHNOLOGY
Topics Covered
The History of the Automobile
Introduction
Why Four-wheel Steering (4WS) System?
Types
Mechanical
Hydraulic...
Nicolas-Joseph
Nicolas-Joseph Cugnot demonstrated his fardier à
vapeur ("steam dray"), an experimental steam-driven
artill...
19th century
 Among

other efforts, in 1815, a
professor at Prague Polytechnic, Josef
Bozek, built an oil-fired steam car...
First automobile in Japan in 1898, a Panhard.
Published in "La France Automobile" in 1898.
Internal combustion engines
In 1806, the
first cars
powered by an
internal
combustion
engine
running on
fuel gas
appeared,...
FOUR-WHEEL STEERING
SYSTEM
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
 Ste...
Fail-safe measures
 Hydraulic failure
 Electrical failure
 Positioning of the wheels
Advantages of 4WS


Speed can be varied

Slow


Medium

Improved maneuverability

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
THANK YOU
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Four wheel steering system

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Four wheel steering system

  1. 1. DEVELOPMENT OF AUTOMOBILE TECHNOLOGY
  2. 2. Topics Covered The History of the Automobile Introduction Why Four-wheel Steering (4WS) System? Types Mechanical Hydraulic Electro-hydraulic Actual 4WS Fail-safe measures Advantages Application
  3. 3. Nicolas-Joseph Nicolas-Joseph Cugnot demonstrated his fardier à vapeur ("steam dray"), an experimental steam-driven artillery tractor, in 1770 and 1771.
  4. 4. 19th century  Among other efforts, in 1815, a professor at Prague Polytechnic, Josef Bozek, built an oil-fired steam car, Walter Hancock, builder and operator of London steam buses, in 1838 built a four-seat steam phaeton.
  5. 5. First automobile in Japan in 1898, a Panhard. Published in "La France Automobile" in 1898.
  6. 6. Internal combustion engines In 1806, the first cars powered by an internal combustion engine running on fuel gas appeared, Benz PatentMotorwagen,
  7. 7. FOUR-WHEEL STEERING SYSTEM
  8. 8. INTRODUCTION  What is 4WS?  How does it work?
  9. 9. Why Four-wheel Steering (4WS) System?
  10. 10. Types Mechanical Hydraulic Electro-Hydraulic
  11. 11. Mechanical 4WS System Inside a rear-steering gear box is a simple planetary gear setup
  12. 12. Hydraulic 4WS System Simple Hydraulic 4WS System
  13. 13. Electro-hydraulic 4WS System An Electronically & Hydraulically controlled 4WS System using a Stepper motor & Control yoke
  14. 14. Actual 4WS  Rack and pinion front steering, hydraulically controlled  Rear-steering shaft  Vehicle speed sensors  Steering-phase control unit  Centering lock spring  Solenoid valve
  15. 15. Fail-safe measures  Hydraulic failure  Electrical failure  Positioning of the wheels
  16. 16. Advantages of 4WS  Speed can be varied Slow  Medium Improved maneuverability Fast
  17. 17. • Better handling in tight corners • Better parking • Stability is increased 4WS 2WS
  18. 18. Application
  19. 19. Conclusion  Advantageous to 2WS  Complex and expensive  Cost may drop as the system becomes common
  20. 20. THANK YOU

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