Automatic engine stop-start system

  • US 5,653,659 A
  • Filed: 09/27/1995
  • Issued: 08/05/1997
  • Est. Priority Date: 09/27/1995
  • Status: Expired due to Term
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First Claim
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1. An automatic engine stop-start system which automatically stops an engine to reduce fuel consumption whenever an automatic stop condition is fulfilled and automatically starts said engine whenever an automatic start condition is fulfilled, comprising:

  • means for detecting a gearshift lever position of an automatic transmission;

    means for detecting an idling state where an accelerator pedal is not stepped on; and

    ,a transmission control unit generating a stop enable signal when said gearshift lever position is neutral;

    said automatic stop condition being dependent upon an engine rotating speed, a car speed, and the presence of said stop enable signal, and said automatic start condition being dependent upon the engine rotating speed, said gearshift lever position, and the presence of said idling state, said transmission control unit determining the presence of said automatic stop and start enable signals from rising or falling edges of the automatic stop and start enable signals.

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