Compensated open-loop control of oxygen sensor heater

Compensated open-loop control of oxygen sensor heater

An oxygen sensor heater control determines heater activation based on an open-loop control parameter and a correction factor that compensates for part-to-part variability. Following a cold start where the heater temperature can be reliably estimated, the engine controller predicts the resistance of...

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1. Verfasser: SMITH JAMES CRAIG
Format: Patent
Sprache:eng
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INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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creator SMITH JAMES CRAIG
description An oxygen sensor heater control determines heater activation based on an open-loop control parameter and a correction factor that compensates for part-to-part variability. Following a cold start where the heater temperature can be reliably estimated, the engine controller predicts the resistance of the heating element and heater circuit at the desired operating temperature of the sensor, and computes the correction factor for heater activation based on the predicted resistance values and nominal resistance values. At least one predicted value is stored in non-volatile memory, and used to compute the correction factor following a warm or hot start of the engine.
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subjects INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
title Compensated open-loop control of oxygen sensor heater
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