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Control device and control method for lean-burn engine

  • US 5,813,386 A
  • Filed: 03/28/1997
  • Issued: 09/29/1998
  • Est. Priority Date: 12/28/1993
  • Status: Expired due to Fees
First Claim
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1. A control device for a lean-burn engine, comprising:

  • load state detecting means for detecting a load state of the engine;

    intake air amount adjusting means for adjusting an amount of intake air supplied to the engine; and

    control means for controlling said intake air amount adjusting means according to the engine load state detected by said load state detecting means, so as to cause that change in the load state which permits a difference between output torques of the engine before and after switching to be reduced or canceled, when the switching is made from driving with a first air-fuel ratio which is set equal to a theoretical air-fuel ratio or on a fuel-rich side with respect thereto to driving with a second air-fuel ratio which is set on a fuel-lean side with respect to the theoretical air-fuel ratio, whereinsaid intake air amount adjusting means includes an intake flow rate control valve provided in an intake passage for introducing the intake air into a combustion chamber of the engine, andsaid control means controls the intake air amount of the engine towards an increasing side and temporarily delays ignition timing of the engine so as to be adapted for increase of the intake air amount, and then controls the ignition timing towards an advance side and controls air-fuel ratio towards a lean side.

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