Series parallel heated oxygen sensor heater control
First Claim
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1. A circuit for applying power to multiple heaters of a heated exhaust gas oxygen sensor including:
- a first parallel configuration of multiple heaters;
a serial configuration that reduces the power in a heater to 1/4 that of said first parallel configuration; and
further including a switching means to change the coupling of the said multiple heaters from the parallel to the serial configuration.
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Abstract
This invention teaches a series parallel heated oxygen sensor control wherein a parallel portion is used to apply heat to the oxygen sensor during warm-up and a series portion is used to apply heat to the oxygen sensor afterwards so that about one quarter of the amount of power is applied after warm-up.
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Citations
2 Claims
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1. A circuit for applying power to multiple heaters of a heated exhaust gas oxygen sensor including:
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a first parallel configuration of multiple heaters; a serial configuration that reduces the power in a heater to 1/4 that of said first parallel configuration; and further including a switching means to change the coupling of the said multiple heaters from the parallel to the serial configuration. - View Dependent Claims (2)
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Specification