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Steering > Power Assited Steering > Flashcards

Power Assited Steering Flashcards

1
Q

Why is power assisted steering needed?

A

Because of increased loads on steered wheels

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2
Q

What are some examples of increased loads on steering wheels?

A

Additional weight of large power trains

Change in steering geometry design

Wider section tyres

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3
Q

What requirements must PAS meet?

A

Must be Fail safe- must be able to retain control in an emergency

Assistance proportional to the effect applied

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4
Q

What are the 3 components required with a rack and pinion PAS?

A

Pump and reservoir (integral PRV)

Control valve

Ram cylinder

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5
Q

How is the hydraulic pump driven?

A

By a belt of the engine complete with reservoir and filter

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6
Q

What is the operation of PAS when travelling in a straight line?

A

Pump supplies oil to the control valve that connects to the pinion

Control is in the neutral position

Fluid returns to reservoir

No PAS

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7
Q

What is the operation when turning?

A

Pump supplies oil to the control valve that connects the pinion

Control valve is in the turn position

Fluid pressurises one side of the piston m

Ram moves turning the wheels

Displaced fluid returns to the pump reservoir via a control valve ?

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8
Q

What valve allows displaced fluid to return to the pump reservoir?

A

Control valve

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9
Q

What is situated in the steering box to relive excessive pressure?

A

Pressure relief valve

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10
Q

What controls the outlet and inlet of the oil ?

A

Rotary control valve (spool valve)

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11
Q

At low rpm (e.g parking) power assistance is what?

A

High

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12
Q

High rpm (cruising) power assistance is what?

A

Reduced giving driver more of a feel

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13
Q

What does the control valve do?

A

Reduce pump pressure at predetermined speed

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14
Q

What are the maintenance for the PAS?

A

Check oil level
Leaks
Check condition and routing of all pipes
Drive belt condition and tension

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15
Q

What causes noisy power assisted steering?

A

Low fluid level

Slack drive belt

Malfunctioning control valve

Internal worm pump

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16
Q

What are the causes of inadequate steering assistance?

A 
Low fluid level
Slack drive belt 
Kinks in hydraulic hoses
Malfunctioning control valve 
Malfunctioning relief valve 
Internally worn pump
Worn ram cylinder
17
Q

What causes excessive steering kick back?

A

Air in system

18
Q

What causes steering judder towards locks

A

Low fluid level
Slack drive belt
Malfunctioning control valve

Steering (5 decks)

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