SYSTEM AND METHOD FOR SELECTIVE CYLINDER DEACTIVATION
First Claim
Patent Images
1. A method, comprising:
- during a skip fire mode or skip fire mode transition,port injecting a first fuel quantity to an engine cylinder, the first fuel quantity based on a first, predicted air charge amount for the cylinder and lean of a desired air-fuel ratio; and
direct injecting a second fuel quantity to the cylinder, the second fuel quantity based on the first fuel quantity and a second, air charge amount for the cylinder.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments for operating an engine with skip fire are provided. In one example, a method comprises during a skip fire mode or during a skip fire mode transition, port injecting a first fuel quantity to a cylinder of an engine, the first fuel quantity based on a first, predicted air charge amount for the cylinder and lean of a desired air-fuel ratio, and direct injecting a second fuel quantity to the cylinder, the second fuel quantity based on the first fuel quantity and a second, calculated air charge amount for the cylinder.
50 Citations
20 Claims
-
1. A method, comprising:
during a skip fire mode or skip fire mode transition, port injecting a first fuel quantity to an engine cylinder, the first fuel quantity based on a first, predicted air charge amount for the cylinder and lean of a desired air-fuel ratio; and direct injecting a second fuel quantity to the cylinder, the second fuel quantity based on the first fuel quantity and a second, air charge amount for the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A method, comprising:
during a skip fire mode or a skip fire mode transition, injecting a first fuel quantity to a first engine cylinder, the first fuel quantity based on a first air charge amount for the first cylinder and a desired air-fuel ratio; and injecting a second fuel quantity to a second engine cylinder, the second fuel quantity based on the first fuel quantity and a second air charge amount for the first cylinder. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
18. A system, comprising:
-
an engine having a plurality of cylinders; a port fuel injection system to port inject fuel to each cylinder of the plurality of cylinders; a direct fuel injection system to direct inject fuel to each cylinder of the plurality of cylinders; a spark ignition system to initiate combustion in each cylinder of the plurality of cylinders, including one or more ionization sensors to detect occurrence of combustion events in the plurality of cylinders; and a controller including non-transitory instructions to; determine a commanded firing order of the engine during a skip fire mode, where at least a first cylinder of the plurality of cylinders is scheduled to be fired and at least a second cylinder of the plurality of cylinders is scheduled to be skipped; and during firing of the first cylinder, activate the port fuel injection system to port inject a first fuel quantity to the first cylinder during a first, earlier portion of an engine cycle, activate the direct fuel injection system to direct inject a second fuel quantity to the first cylinder during a second, later portion of the engine cycle, and activate the spark ignition system to initiate combustion in the first cylinder, where the first fuel quantity is lean of a first desired air-fuel ratio for the first cylinder that is based on an estimated air charge amount for the first cylinder, and the second fuel quantity brings on overall air-fuel ratio for the first cylinder to a second, desired air-fuel ratio for the first cylinder that is based on an updated air charge amount for the first cylinder. - View Dependent Claims (19, 20)
-
Specification