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Series parallel heated oxygen sensor heater control

  • US 5,637,786 A
  • Filed: 07/05/1995
  • Issued: 06/10/1997
  • Est. Priority Date: 07/05/1995
  • Status: Expired due to Fees
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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