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Steering Position Sensors: Keeping on Track Fresno CA

On the Ford VAPS system, the control module ignores the steering inputs as long as the driver is making relatively slow steering motions (less than 90 degrees of rotation per second). But if the driver turns sharply or swerves, the control module reacts by reducing current to the cutout solenoid to increase assist.

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Steering Position Sensors: Keeping on Track

The steering position sensor's basic function is to monitor the driver's steering inputs. This includes the angle of the steering wheel and/or the rate at which the driver is turning the wheel. The information may be used to vary hydraulic pressure in a variable-assist power steering system, or by a stability control system to improve handling, braking and traction under changing driving conditions.

EARLY APPLICATIONS
On early Ford systems, the steering sensor functioned only as a rotation sensor. It did not measure the angle of the steering wheel, but only the rate at which the steering wheel was being turned by the driver.

Most of these early generation steering sensors were optical sensors with photo diodes inside that read evenly spaced slits in a disc attached to the steering column. Turning the steering wheel to either side generated a pulse signal that went to a steering control module.

On the Ford VAPS system, the control module ignores the steering inputs as long as the driver is making relatively slow steering motions (less than 90 degrees of rotation per second). But if the driver turns sharply or swerves, the control module reacts by reducing current to the cutout solenoid to increase assist.

On later versions of the Ford VAPS system that appeared on the Ford Probe, the steering sensor also measured the actual angle of the steering wheel. At speeds below 6 mph or when the steering wheel was turned more than 45 degrees off-center, the VAPS system deli...

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