Ford Global Technolgoies, LLC

Ken John Behr

David Karl Bidner

Michael Igor Kluzner

Mark Thomas Linenberg

Jeff Robert Seaman

Has R Patel

Bob Roy Jentz

Air/fuel imbalance monitoring systems and methods for monitoring air/fuel ratio imbalance of an internal combustion engine are disclosed. In one embodiment, an oxygen sensor is sampled above cylinder firing frequency and a ratio of data from at least one window over a total number of windows is determined. The approach can be used to indicate imbalances between engine cylinders.

Air/fuel imbalance monitor using an oxygen sensor

A method of controlling fuel injection in an engine of a vehicle comprises reactivating fuel injectors based on release or decrease of driver braking during deceleration fuel shut off operation. According to another aspect, a method of controlling fuel injection in an engine of a vehicle comprises reactivating fuel injectors based on release or decrease of driver braking during deceleration fuel shut off; and increasing air flow to a cylinder before reactivation of fuel injectors in response to said release or decrease of driver braking to enhance torque response. The methods allow an engine to exit DFSO earlier by making use the brake input and effort, which provides time to reactivate the fuel injection and stabilize torque control prior to tip-in.

System and method to control fuel injector reactivation during deceleration fuel shut off

Growing community of inventors

Farmington Hills, MI, United States of America

Ken John Behr