Cruise control method

摘要

A method of controlling an engine in a motor vehicle includes opening a throttle to an increased angle when conditions for fuel cut cycling are met. More specifically, when cruise control is on, the motor vehicle is moving downhill, and the current speed drops below a target speed, the engine control unit may choose to increase the angle of the throttle while maintaining fuel cut. Under other interrupting events, the engine control unit may choose to resume fueling control or reduce the throttle angle.

主权项

1. A method for controlling a motor vehicle, the method comprising:
receiving operating information, the operating information including fuel cut information, cruise control information, vehicle speed information and roadway slope information; determining that the motor vehicle is operating in a fuel cut mode, wherein the motor vehicle comprises a plurality of fuel injectors and a plurality of cylinders and the fuel cut mode comprises commanding the plurality of fuel injectors to cut off fuel to the plurality of cylinders; determining that the motor vehicle is traveling on a downwardly sloped roadway; determining that the motor vehicle is operating in a cruise control mode; determining a current vehicle speed; retrieving a target vehicle speed; maintaining the motor vehicle in the fuel cut mode and increasing a throttle angle opening when the current vehicle speed is less than the target vehicle speed to reduce engine braking and increase the current vehicle speed; and determining if the current vehicle speed is equal to or greater than the target vehicle speed and resuming normal throttle operation upon a determination that the current vehicle speed is equal to or greater than the target vehicle speed.