Current control method for an oxygen sensor heater
US6586711B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2001 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved control for the heater element of a motor vehicle engine exhaust gas oxygen sensor determines the temperature of the heater element and adjusts the heater element current by closed-loop control to minimize deviation of the heater element temperature from a desired heater temperature determined in relation to the desired oxygen sensor temperature. The heater temperature is calculated based on the heater element resistance, and the heater resistance is adaptively adjusted to account for sensor-to-sensor variation. The adaptive adjustment is updated based on a deviation of the measured heater element resistance from an expected value under predetermined calibration conditions at engine start-up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.