US 6,736,120 B2 · Method and system of adaptive learning for engine exhaust gas sensors

Abstract

A method is disclosed for controlling operation of an engine coupled to an exhaust treatment catalyst. Under predetermined conditions, the method operates an engine with a first group of cylinders combusting a lean air/fuel mixture and a second group of cylinders pumping air only (i.e., without fuel injection). In addition, the engine control method also provides the following features in combination with the above-described split air/lean mode: idle speed control, sensor diagnostics, air/fuel ratio control, adaptive learning, fuel vapor purging, catalyst temperature estimation, default operation, and exhaust gas and emission control device temperature control. In addition, the engine control method also changes to combusting in all cylinders under preselected operating conditions such as fuel vapor purging, manifold vacuum control, and purging of stored oxidants in an emission control device.

Claims10

Dependent claims

A system comprising:

an engine having a first and second group of cylinders;
a sensor coupled to at least one of said first and second groups;
a controller for operating the engine in a first mode with a mixture of air and substantially no injected fuel in the first combustion group and with air and injected fuel in the second combustion group, operating in second mode where both of said first and second groups combusts a mixture of air and injected fuel, and disabling adaptive learning of the sensor during said first mode and enabling said adaptive learning during the second mode.

Dependencies are inferred from the claim text.

Method and system of adaptive learning for engine exhaust gas sensors

Life of this patent

Method and system of adaptive learning for engine exhaust gas sensors

Life of this patent

Abstract

Claims10