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Heater controller for an oxygen sensor

  • US 20030213795A1
  • Filed: 05/14/2003
  • Published: 11/20/2003
  • Est. Priority Date: 05/15/2002
  • Status: Active Grant
First Claim
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1. A heater controller for controlling the duty of a heater for an oxygen sensor which detects concentration of oxygen in exhaust gas of a vehicle engine, said controller comprising:

  • a start detect section which detects whether said engine is started;

    a restart determination section which determines whether said engine is restarted; and

    a heater delay control section which operates to activate said heater after a predetermined delay time from startup of said engine and is set according to the engine coolant temperature;

    whereby said operation of said heater is executed when (1) said start detect section detects that said engine is started and (2) said restart determination section determines that said engine is not restarted.

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