Abstract: A method for controlling a direct-injection gasoline engine during regeneration of a lean NOx trap disposed in an exhaust path of the engine includes determining the current air-fuel ratio and comparing the current air-fuel ratio to a lean limit air-fuel ratio. Transitions from lean stratified engine operation to rich homogenous engine operation are delayed until the current air-fuel ratio reaches the lean limit air-fuel ratio.

Abstract: A method and system for detection of continuous single cylinder misfire, by more completely analyzing an estimated periodic sequence of reference period signals, and comparing the periodic sequence with a sample corresponding to an immediately prior revolution, is offered. Data occurring periodically, with a period of one revolution, are eliminated, whereas signals associated with a period of one engine cycle are enhanced. This comprises measuring a sequence of engine reference periods corresponding to a single engine revolution. Transient noise is removed. A first difference is calculated, and a disturbance sequence is estimated, correlatable to a single engine cycle. A difference is calculated and compared to a threshold. The threshold comprises an array of calibrated values, determined based upon engine operating speed and engine load.

Abstract: A vehicle has multiple electrical propulsion systems. Torque is split among the various propulsion systems to meet a variety of requirements and limitations including operator demand, vehicular traction limits, electric machine torque capabilities, machine efficiency operating points and available electrical power.