Methods and system for operating skipped cylinders to provide secondary air

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United States of America Patent

PATENT NO 11635004
APP PUB NO 20220333509A1
SERIAL NO

17233271

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Abstract

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Methods and systems are provided for providing secondary air to an exhaust system during catalyst warm-up. In one example, a method may include, during a cold start condition, operating an engine with a first number of cylinders unfired and a remaining number of cylinders fired during an engine cycle, opening an intake valve of an unfired cylinder of the first number of cylinders during an expansion stroke of the unfired cylinder, and opening an exhaust valve of the unfired cylinder during a compression stroke of the unfired cylinder. In this way, the unfired cylinders may provide the secondary air to the exhaust system during a stroke that increases mixing of the secondary air with burned exhaust gas from fired cylinders, thus increasing exotherm production in the exhaust system to increase a temperature of the catalyst.

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Patent Owner(s)

Patent OwnerAddress
FORD GLOBAL TECHNOLOGIES LLC1 AMERICAN ROAD FL4 DEARBORN MI 48126-2701

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Glugla, Chris Paul Macomb, US 186 2682
Kiwan, Rani Canton, US 48 55
VanDerWege, Brad Plymouth, US 11 15

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