Four Wheel Steering

Question 1

Why do modem cars have slight understeer?

Answer 1

Improve stability at high speeds

Question 2

What helps to improve the slip of tyres as well as reducing the turning circle?

Answer 2

Rear wheels steer in the opposite direction then the front wheels

Question 3

At high speeds the steering movements are subtle and turn in what direction?

Answer 3

The same direction and move in a crab like manner which improves stability

Question 4

At fast speeds what direction are the wheels moved?

Answer 4

Same direction

Question 5

At low speeds rear wheels are turned in what direction?

Answer 5

Opposite to the direction of the front wheels

Question 6

What are the advantages of a 4 wheel steering system?

Answer 6

Superior cornering ability

Improved steering responsiveness

High speed straight line stability

Improved lane changing manoeuvres

Smaller turning radios and tight space manoeuvrability at low speed

Question 7

What do 2 axles at the front of a vehicle do?

Answer 7

Share out and support the load

Question 8

What are the advantages of twin steered front axle over single axle?

Answer 8

Static payload and stress per axle is lessened

Road holding improved

A puncture of one of the tyres will not prevent the vehicle being safely steered to a standstill

Question 9

What are the 4 modes of steering?

Answer 9

Front wheel steer

Crab steer

Opposite phase steer

Rear wheel steer