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Athrottle position sensor (TPS) is asensor used to monitor the throttle body valve position for the ECU of an engine. The sensor is usually located on thebutterfly spindle/shaft, so that it can directly monitor the position of the throttle. More advanced forms of the sensor are also used. For example, an extra "closed throttle position sensor" (CTPS) may be employed to indicate that the throttle is completely closed. Someengine control units (ECUs) also control the throttle position byelectronic throttle control (ETC) or "drive by wire" systems, and if that is done, the position sensor is used in afeedback loop to enable that control.[1]
Related to the TPS are accelerator pedal sensors, which often include awide open throttle (WOT) sensor. The accelerator pedal sensors are used inelectronic throttle control or "drive by wire" systems, and the most common use of a wide open throttle sensor is for thekick-down function onautomatic transmissions.
Modern day sensors are non contact type. These modern non contact TPS includeHall effect sensors,inductive sensors,magnetoresistive and others. In thepotentiometric type sensors, a multi-finger metal brush/rake is in contact with a resistive strip,[2] while the butterfly valve is turned from the lower mechanical stop (minimum air position) to WOT, there is a change in the resistance and this change in resistance is given as the input to the ECU.
Non contact type TPS work on the principle ofHall effect or inductive sensors, or magnetoresistive technologies, wherein generally the magnet or inductive loop is the dynamic part which is mounted on the butterfly valve throttle spindle/shaft gear and the sensor & signal processing circuit board is mounted within the ETC gear box cover and is stationary. When the magnet/inductive loop mounted on the spindle which is rotated from the lower mechanical stop to WOT, there is a change in the magnetic field for the sensor. The change in the magnetic field is sensed by the sensor and the voltage generated is given as the input to the ECU. Normally a two polerare-earth magnet is used for the TPS due to their highCurie temperatures required in the under-hood vehicle environment. The magnet may be of diametrical type, ring type, rectangular or segment type. The magnet is defined to have a certain magnetic field that does not vary significantly with time or temperature.
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