Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: Methods and systems are provided for addressing pre-ignition that may be induced in response to actions taken to mitigate a cylinder misfire. An amount of engine load limiting applied may be adjusted to reduce the likelihood pre-ignition while also addressing component over-temperature issues. By limiting an engine load while shutting off fuel in a misfiring cylinder, and while combusting a lean air-fuel mixture in the remaining cylinders, pre-ignition induced by the misfire-mitigating lean combustion conditions can be reduced.

Abstract: A method and system for controlling an internal combustion engine system upon loss of a crankshaft position sensor signal produced by such system is provided. The method includes providing a control module having a central processing unit and a time processor unit associated with such central processing unit. The time processor unit has programmed into is a first code for operating the engine system in the presence of a proper crankshaft position sensor signal. The control module stores a second code for loading into the time processor unit to operate the engine system with the time processor unit upon detection of an improper crankshaft position sensor signal. Initially, the engine system is operated with the time processor unit executing the first code. The method monitors the crankshaft position signal for a fault. Upon detection of the fault, the method loads the second code into the time processor unit and operates the engine system with the time processor unit executing the second code.

Abstract: A method for determining engine position during engine starting is described wherein cylinder identification is determined based on either the absence or presence of a cylinder identification signal. The approach is used when it is determined that engine speed is large enough so that the cylinder identification signal can be recognized.

Abstract: A method and system for controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients caused by intake control device transitions. The method and system compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including cylinder air charge. An initial base desired fuel mass is determined based on the plurality of engine parameters. An initial transient fuel mass is also determined based on prior injection history which, in turn, is modified based on the transition of the intake control device for that cylinder. A desired injected fuel mass to be delivered to the cylinder is determined based on the initial base desired fuel mass and the initial transient fuel mass. These same calculations are then used to compensate for changes to the base desired fuel mass while the fuel injection is in progress, resulting in an updated desired injected fuel mass.

Abstract: A method for preventing reverse running of an internal combustion engine includes determining the operational state of the vehicle starter motor, determining whether a stall or imminent stall condition exists, and suspending operation of the engine based on the stall or imminent stall condition.

Abstract: A method for determining an operational state of a vehicle starter motor coupled to vehicle battery includes the steps of detecting a vehicle battery voltage, deriving an average vehicle battery voltage, and inferring the operational state of the starter motor based at least in part on a difference between the detected vehicle battery voltage and the average vehicle battery voltage.

Abstract: A method and system for controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients caused by intake control device transitions. The method and system compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including cylinder air charge. An initial base desired fuel mass is determined based on the plurality of engine parameters. An initial transient fuel mass is also determined based on prior injection history which, in turn, is modified based on the transition of the intake control device for that cylinder. A desired injected fuel mass to be delivered to the cylinder is determined based on the initial base desired fuel mass and the initial transient fuel mass. These same calculations are then used to compensate for changes to the base desired fuel mass while the fuel injection is in progress, resulting in an updated desired injected fuel mass.

Abstract: A method and system for controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients caused by intake control device transitions. The method and system compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including cylinder air charge. An initial base desired fuel mass is determined based on the plurality of engine parameters. An initial transient fuel mass is also determined based on prior injection history which, in turn, is modified based on the transition of the intake control device for that cylinder. A desired injected fuel mass to be delivered to the cylinder is determined based on the initial base desired fuel mass and the initial transient fuel mass. These same calculations are then used to compensate for changes to the base desired fuel mass while the fuel injection is in progress, resulting in an updated desired injected fuel mass.

Abstract: A method and system for determining and controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including cylinder air charge. An initial base desired fuel mass is determined based on the plurality of engine parameters. An initial transient fuel mass is also determined based on prior injection history for that cylinder. A desired injected fuel mass to be delivered to the cylinder is determined based on the initial base desired fuel mass and the initial transient fuel mass. These same calculations are then used to compensate for changes to the base desired fuel mass while the fuel injection is in progress, resulting in an updated desired injected fuel mass. Finally, the injection history for that cylinder is updated to account for the actual desired fuel mass delivered to the cylinder.

Abstract: A method and system for controlling fuel delivery to an individual cylinder of an internal combustion engine during engine cranking compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including engine temperature, inducted air mass per cylinder and number of engine intake events since cranking. A temperature of the engine stored at key-off is determined. A new puddle mass estimate for the cylinder is determined based on the decay ratio of the new puddle mass estimate to the prior puddle mass estimate stored before key-off utilizing the temperature of the engine stored at key-off. A desired fuel mass to be injected into the cylinder is then determined based on the new puddle mass estimate and the plurality of engine parameters.