The “Electronic Variable Orifice” (EVO) steering system was introduced by General Motors. The vehicle’s computer monitored vehicle speed and steering wheel action to activate and deactivate a solenoid on the steering pump that controlled fluid flow to the steering gear.
What is the electronic variable orifice?
E.V.O. stands for Electronically Variable Orifice. This component is controlled by an electronic control module that reduces fluid pressure from the power steering pump to the steering gear at highway speeds. Improved high speed handling and road feel is the result.
Where is the actuator solenoid mounted in an electronic variable orifice Evo steering system?
The electronic variable orifice (EVO) power steering pump is a conventional power steering pump with a power steering (PS) solenoid actuator mounted to the outlet port. When the driving conditions require less hydraulic fluid, a flow control valve restricts the flow of the fluid.
What causes steering malfunction?
Pump malfunctions, fluid leaks, blocked hoses, contamination of power steering fluid, or worn power steering belts are some specific factors that can contribute to steering system failure.
What is variable assisted steering?
Variable assist power steering is a system where the level of assist varies according to the vehicle’s speed. For example, with a ford variable-assist power steering, the car requires less assist and effort to steer while the speed increases.
What is variable ratio power steering?
Variable-ratio steering
Variable-ratio steering is a system that uses different ratios on the rack in a rack and pinion steering system. At the center of the rack, the space between the teeth are smaller and the space becomes larger as the pinion moves down the rack.
What does a power steering control valve do?
The power steering control valve directs fluid where to go when you turn the steering wheel. For example, when you turn the wheel to the right, the power steering control valve rotates so pressure is applied to the correct side of the cylinder, so your vehicle goes in the right direction.
Where is the control valve located in a rack and pinion power steering system?
Once your left front tire has been removed, you should see the power steering control valve. It’s usually attached to the center pitman arm, right above the steering box.
Which of the following is a steering component?
A motor vehicle’s steering system contains the following basic parts: Steering wheel, Steering shaft and Column, Tie rods, rack, idler arms, Pitman arm, and drag or center link.
Can speed sensor affect power steering?
This way you have the best of both worlds! The speed sensing steering enables power steering to continue to function at high speeds but allows for you to have more control when driving at highway speeds.
What is EVO on rack and pinion?
E.V.O. stands for Electronically Variable Orifice. This component is controlled by an electronic control module that reduces fluid pressure from the power steering pump to the steering gear at highway speeds. Improved high speed handling and road feel is the result.
How do I fix the EPS problem in my car?
This issue with the EPS light can also be caused if you have recently had to jump-start your car, or you’ve disconnected the battery. Occasionally, the problem can be fixed by simply turning your vehicle off and on again.
Is it OK to drive without power steering?
You can drive a car without power steering, but the steering will be more noticeable difficult. In addition, driving without power for extended hours will cause severe damages to your steering system, making it more expensive to repair.
How do I know if my rack and pinion or power steering pump is bad?
The symptoms of a bad steering pump include:
Your Car Makes a Whining Noise Any Time You Turn the Wheel. Your Car’s Steering Wheel Is Slow to Respond. Your Car’s Steering Wheel Is Stiff. Your Car Makes Squealing Noises When You Turn the Key in the Ignition. Your Car Makes Groaning Noises.
How do I know if my car has variable ratio steering?
To identify a variable-assist power steering, you may try doing a visual search. You can start that by studying the hydraulic power assist if that uses a droop flow pump. If this pump stays in the same place even with an accelerated engine RPM, that means your vehicle is aided with variable-assist power steering.
What are advantages of variable ratio steering and variable assist power steering?
As a vehicle’s speed increases, less effort and assist are needed to steer the wheels. Variable-rate steering, by comparison, applies more assist at low speed when it is needed most and reduces assist at higher speeds when it is needed least.
What are the advantages of variable ratio steering?
The advantage of an electronically controlled variable gear ratio Steering Assembly is that it adjusts to the ideal steering condition for whatever the car’s speed happens to be.
