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Mode transition control scheme for internal combustion engines using unequal fueling

  • US 6,360,713 B1
  • Filed: 12/05/2000
  • Issued: 03/26/2002
  • Est. Priority Date: 12/05/2000
  • Status: Expired due to Term
First Claim
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1. A mode transition method for controlling torque produced by an internal combustion engine, the engine having a plurality of cylinders, an exhaust system containing one or more emission aftertreatment devices, and an engine controller operably connected to the engine for controlling the relative air-fuel ratio supplied to the cylinders, the method comprising the steps of:

  • operating at least one cylinder at a lean relative air-fuel ratio in response to an indication of desired torque; and

    operating at least one other cylinder at a rich relative air-fuel ratio to reduce emissions which would otherwise be caused by operating said at least one cylinder at said lean relative air-fuel ratio.

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