Method to operate an internal combustion engine

摘要

A method to operate a vehicle equipped an internal combustion engine and a transmission coupled to drive wheels. The vehicle is equipped with a parking brake and has an electronic control unit with memory and the engine in fluid communication with an exhaust aftertreatment system. The method includes the steps of determining whether the engine is operating in idle mode for a predetermined period of time; determining whether NOx emissions exceed a predetermined level after the predetermined period of time; and limiting the engine speed not to exceed a predetermined engine speed until an operator engages the parking brake and engages an engine ignition switch.

主权项

1. A method to operate a vehicle equipped with an internal combustion engine and a transmission coupled to drive wheels; said vehicle further equipped with a parking brake and having an electronic control unit with memory; said engine in fluid communication with an exhaust aftertreatment system; comprising:
determining whether said engine is operating in idle mode for a predetermined period of time; determining whether NOx emissions exceed a predetermined level after said predetermined period of time; limiting said engine speed not to exceed a predetermined engine speed until an operator engages said parking brake and engages an engine ignition switch.