Methods and systems for controlling engine shutdown in a vehicle

Abstract

Methods and systems are provided for controlling engine shutdown in a vehicle. One example method includes, after discontinuation of combustion and during engine spin down, reducing cylinder air charge while maintaining intake manifold pressure above a threshold value.

Description

【Technical field】 [0001] The present invention relates to a method and system for controlling engine shutdown in a vehicle. 【Background technique】 [0002] During operation of a motor vehicle, it may be necessary to stop the vehicle for a period of time, for example at a traffic light (hereinafter "temporary stop"). Some vehicles can be run during a temporary stop by idling the engine within the engine system. Other vehicles can stop the engine (even without a driver request to shut down the engine) during temporary stops to reduce fuel consumption. For example, the vehicle may shut down the engine by shutting down the fuel supply and / or ignition to allow the engine speed to drop to a standstill. The engine can then be automatically restarted once conditions indicate that the driver intends to start the vehicle. [0003] One example method of controlling engine stopping during such a temporary stop is described in US Patent 4,515,124. This patent describes a system and a...

AI Technical Summary

Problems solved by technology

Instead, the engine may then be fully rev-down and utilize a restart from stop, which may create a sufficient delay in providing vehicle launch relative to the driver's request.

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