Abstract: Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

Abstract: Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

Abstract: Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

Abstract: Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

Abstract: A drive system. The drive system includes an engine configured to convert chemical energy into mechanical energy, an electronically-controlled air throttle configured to regulate air delivery to the engine, an electronically-controlled supercharger configured to selectively increase pressure of the air delivered to the engine, and a controller configured to variably engage the supercharger based on an operating parameter of the drive system.

Abstract: A method for determining airflow to a cylinder of an internal combustion engine, such airflow passing to the cylinder through an intake manifold. The method includes providing a model of the intake manifold, such model providing a relationship between expected output airflow from the intake manifold in response to airflow into the intake manifold; determining from the model the expected output airflow from the intake manifold from a previous commanded airflow into the intake manifold; determining a compensation airflow required for the input airflow to the intake manifold to drive the expected output from the intake manifold towards the desired cylinder airflow; and providing such compensation airflow to the intake manifold.

Abstract: A drive system. The drive system includes an engine configured to convert chemical energy into mechanical energy, an electronically-controlled air throttle configured to regulate air delivery to the engine, a supercharger configured to selectively increase pressure of the air delivered to the engine, and a supercharger diagnostic system configured to diagnose supercharger over-boosting or under-boosting.

Abstract: A method for determining airflow to a cylinder of an internal combustion engine, such airflow passing to the cylinder through an intake manifold. The method includes providing a model of the intake manifold, such model providing a relationship between expected output airflow from the intake manifold in response to airflow into the intake manifold; determining from the model the expected output airflow from the intake manifold from a previous commanded airflow into the intake manifold; determining a compensation airflow required for the input airflow to the intake manifold to drive the expected output from the intake manifold towards the desired cylinder airflow; and providing such compensation airflow to the intake manifold.

Abstract: An engine emissions diagnostic is disclosed that utilizes parameters correlating to catalyst temperature to identify when an indication of degraded performance may be generated.

Abstract: A drive system. The drive system includes an engine configured to convert chemical energy into mechanical energy, an electronically-controlled air throttle configured to regulate air delivery to the engine, an electronically-controlled supercharger configured to selectively increase pressure of the air delivered to the engine, and a controller configured to variably engage the supercharger based on an operating parameter of the drive system.

Abstract: A drive system. The drive system includes an engine configured to convert chemical energy into mechanical energy, an electronically-controlled air throttle configured to regulate air delivery to the engine, a supercharger configured to selectively increase pressure of the air delivered to the engine, and a supercharger diagnostic system configured to diagnose supercharger over-boosting or under-boosting.