Honda Motor Co., Ltd.

Michael Neisen

Kenji David Matsuura

A method is provided for adjusting a fuel composition estimate. The method generally uses a non-fuel related property to determine fuel composition. In some cases the method can be used after refueling and when the engine is operating without the benefit of oxygen sensor data, which can include evaluating data not based on characteristics of the fuel or exhaust from its combustion, such as engine torque variations while using the fuel. The method can include monitoring estimated engine torque to determine whether first variations in engine torque exceed a threshold, and, if so, modifying the previous estimate of fuel composition prior to the refueling event by a pre-determined amount.

Method of adjusting a fuel composition estimate

A method and system for managing temperatures in an exhaust system of a motor vehicle is disclosed. The method includes a step of predicting an overheat condition of a catalyst and a seal mat included in a catalytic converter. The method also includes a step of selecting a fuel enrichment map to determine a fuel delivery amount based on a predicted overheat condition. The method and system further includes providing a fuel enrichment map for an overheat condition of a catalyst that includes fuel delivery amounts that are less than fuel delivery amounts included in a fuel enrichment map for an overheat condition of a seal mat.

Method for managing temperatures in an exhaust system of a motor vehicle

An air-fuel ratio sensor early activation feedback system and method includes an air-fuel ratio sensor for measuring an air-fuel ratio in an exhaust gas generated by an internal combustion engine and a heater for heating the air-fuel ratio sensor. A controller activates the heater prior to startup of the engine based on prior startup times for the engine.

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Ostrander, OH, United States of America

Michael Neisen