초록 ▼

The performance of a gas-fueled unthrottled internal combustion engine is improved by optimizing excess air ratio (lambda) in the engine. Lambda is optimized by selecting automatically and continuously the optimum fraction of cylinders firing (OFF) as a function of engine operating parameters, elimi

The performance of a gas-fueled unthrottled internal combustion engine is improved by optimizing excess air ratio (lambda) in the engine. Lambda is optimized by selecting automatically and continuously the optimum fraction of cylinders firing (OFF) as a function of engine operating parameters, eliminating the fuel charge from one or more cylinders to obtain firing in the OFF, and distributing the unused fuel to the OFF, thereby decreasing lambda in the firing cylinders to an optimum level. OFF may be calculated according to mathematically derived and empirically weighted equations, or obtained with reference to suitable look-up tables. In addition, optimum lambda and OFF may be adjusted to take into account the effects of exhaust gas recirculation (egr), engine speed, and/or engine timing. Further lambda adjustment can be performed by suitable control of egr, ignition timing, and/or turbo air bypass (TAB).

대표청구항

A method of optimizing the excess air ratio (llllOPT); then (C) determining a number (M) of cylinders that the firing of which must be skipped to produce said OFF, M being less than N; and then (D) eliminating a firing and fueling cycle in said M number of cylinders only.

A method of optimizing the excess air ratio (llllOPT); then (C) determining a number (M) of cylinders that the firing of which must be skipped to produce said OFF, M being less than N; and then (D) eliminating a firing and fueling cycle in said M number of cylinders only.