Hall Effect Throttle

Understanding Dual Hall-Effect Throttle Assemblies

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More reliable sensor type/design - Hall effect devices used in motion sensing and motion limit switches can offer enhanced reliability in extreme environments. There are no contacting moving parts involved within the sensor or magnet, No idle validation circuit Eliminates throttle calibration requirements following a throttle or ECM replacement

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When electrons flow through a conductor, a magnetic field is produced. A sensor voltage is applied across two terminals and the third provides a voltage proportional to the current being sensed. Hall effect devices produce a very low signal level and thus require amplification. Many devices now sold as "Hall effect sensors" contain both the sensor described above and a high gain integrated circuit amplifier in a single package. Not a Dual Potentiometer

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Hall Voltage

Lines of Magnetism (Flux Lines)

eady

R Never

Hall Element/Device Applied Voltage

(Semiconductor)

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There are many different Hall effect throttle types available The following slide is intended to illustrate one possible type.

Inside a Hall Device

Movement of contains the shield The Hall effect device special VDC circuits that produce inversely disrupts the an magnetic proportional voltage and then amplify field and reduces the the small voltage into one that can be field strength seen by the used by the ECM. If we were to take a Hall effect measurement at thedevice. Hall element itself, the voltage would be reduced as the The shield is connected shield goes further into the magnetic field. to the throttle pedal.

4.75 0.25 0.75 1.25 2.50 3.25

ld

Fie

Hall Effect Element

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ic net Mag

Hall Effect Device

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Shield

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Primary sensor signal voltages 0.25 4.75 VDC Used by the ECM to determine throttle pedal position

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Spare sensor – rather than idle validation (set to a pre-determined throttle value) allows the vehicle to operate normally (slight derate) Second sensor signal is only half or the primary throttle voltage range (0.25 to 2.375 VDC) Why? Allows the ECM to determine a primary throttle sensor circuit issue when the primary and secondary voltage ratios do not match Must be wired on a different sensor supply & return than the primary throttle sensor

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No need to calibrate replacement throttle assembly Wrong throttle type (with idle validation) installed will generate a fault code Other Fault Codes