four wheel steering system
TRANSCRIPT
Topics Covered
The History of the AutomobileIntroductionWhy Four-wheel Steering (4WS) System?Types
Mechanical Hydraulic Electro-hydraulic
Actual 4WS Fail-safe measures Advantages Application
Nicolas-Joseph
Nicolas-Joseph Cugnot demonstrated his fardier à vapeur ("steam dray"), an experimental steam-driven artillery tractor, in 1770 and 1771.
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.
Internal combustion engines
In 1806, the first cars powered by an internal combustion engine running on fuel gas appeared, Benz Patent-Motorwagen,
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