Method and system for vehicle stop/start control

Abstract

The method provides a method and a syetem for vehicle stop / start control. A method and a system are presented for improving performance of a vehicle operating in a cruise control mode where a controller adjusts torque output from a vehicle to maintain vehicle speed within a desired range. The methods and systems include adapting a vehicle dynamics model and a vehicle fuel consumption map that provide input to nonlinear model predictive controller.

Description

technical field [0001] The present description generally relates to methods and systems for controlling automatic stopping of internal combustion engines. Background technique [0002] Vehicles may include engines that automatically stop (eg, do not spin and burn fuel) in the event of low driver demand torque or power. By stopping the engine, fuel consumption and engine emissions can be reduced. The engine may stop when the vehicle is stopped at a traffic light or when the vehicle is waiting for passengers to arrive. However, to further reduce fuel consumption and engine emissions, it may be desirable to stop the engine when the vehicle is coasting (eg, traveling on a road when the vehicle's engine is not delivering positive torque to accelerate or maintain vehicle speed). However, if the engine restarts immediately after being stopped due to a change in driver demand torque or power, there may be no benefit to stopping the engine because fuel consumption and engine emissi...

AI Technical Summary

Problems solved by technology

However, if the engine restarts immediately after being stopped due to changes in driver demand torque or power, there may be no benefit to stopping the engine because fuel consumption and engine emissions may increase if the engine is stopped for a short period of time

Also, stopping and restarting the engine may annoy vehicle occupants as they may notice noise and vibrations that may be caused during engine stopping and starting

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