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Idle speed control system for automotive internal combustion engine

  • US 5,765,528 A
  • Filed: 07/15/1997
  • Issued: 06/16/1998
  • Est. Priority Date: 07/24/1996
  • Status: Expired due to Fees
First Claim
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1. An idle speed control system for an automotive internal combustion engine which has an intake/exhaust valve control system for electromagnetically operating an intake valve and an exhaust valve, said idle speed control system comprising:

  • target idling speed calculating means for calculating a target idling speed based on engine operating conditions; and

    valve timing changing means for changing an opening period of time of at least one of said intake valve and said exhaust valve so as to maintain the engine speed at said calculated target idling speed during idling.

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