System and method for controlling valve timing of an engine with cylinder deactivation
AssigneeFord Global Technologies, LLC
InventorsDavid Bidner, Gopichandra Surnilla, Jeff Doering
Life of this patent
Estimating the term…
Abstract
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
Claims18
A method for controlling an engine having at least a first and second cylinder, the method comprising:
- operating the first cylinder with a first ignition timing and a first amount of fresh air flow;
- and
- operating the second cylinder with a second ignition timing, more retarded than said first ignition timing, and a second amount of fresh air flow adjusted by an actuator to be different from said first amount of fresh air flow.
A method for controlling an engine having at least a first and second cylinder, the method comprising:
- during engine starting conditions, but after engine cranking operation, operating the first group of cylinders with a first ignition timing and a first amount of fresh air flow;
- and
- operating the second group of cylinders with a second ignition timing, more retarded than said first ignition timing, and a second amount of fresh air flow adjusted by an actuator to be different from said first amount of fresh air flow.
A computer readable storage medium having instructions encoded therein for controlling an engine having at least a first and second cylinder, the medium comprising:
- code for operating the first cylinder with a first ignition timing and a valve characteristic;
- and
- code for operating the second cylinder with a second ignition timing, more retarded than said first ignition timing, and a second valve characteristic different from said first valve characteristic.
A method for controlling an engine having at least a first and second cylinder, the method comprising:
- operating the engine in a first idle speed control mode with a first set-point idle speed, with at least the first cylinder operating with a first ignition timing and at least the second cylinder operating with a second ignition timing, more retarded than said first ignition timing;
- and
- operating the engine in a second idle speed control mode with a second set-point idle speed lower than said first, with at least the first and second cylinders operating with substantially the same ignition timing.
Dependencies are inferred from the claim text.