Air per cylinder determination systems and methods
First Claim
1. An engine control system of a vehicle, comprising:
- a cylinder control module that determines a target fraction of activated cylinders of an engine;
a first air per cylinder (APC) module that determines a first APC value based on an intake manifold pressure and an air temperature;
an adjustment module that determines an APC adjustment value based on the target fraction of activated cylinders;
wherein the first APC module determines a second APC value based on the first APC value and the APC adjustment value;
a second APC module that determines a third APC value based on a mass air flowrate (MAF) into the engine and the target fraction of activated cylinders;
a filter module that applies a filter to the third APC value to determine a fourth APC value;
an air state module that transitions an air state from a first state to a second state when an intake air pressure ratio is less than a predetermined value, a change in the intake air pressure ratio is less than a second predetermined value, a change in the target fraction of activated cylinders is zero, a change in the fourth APC value is less than a third predetermined value, and a change in an intake cam phaser position is less than a fourth predetermined value;
a learning module that adjusts a learn adjustment value at a first predetermined rate when the air state is in the second state and that does not adjust the learn adjustment value when the air state is in the first state;
an adjusting module that adjusts the second APC value based on the learn adjustment value to produce a fifth APC value; and
a fuel control module controls fuel injection based on the fifth APC value and a target air/fuel mixture.
1 Assignment
0 Petitions
Accused Products
Abstract
An engine control system of a vehicle includes a cylinder control module a first air per cylinder (APC) module, an adjustment module, and a fuel control module. The cylinder control module determines a target fraction of activated cylinders of an engine. The first APC module determines a first APC value based on an intake manifold pressure and an air temperature. The adjustment module determines an APC adjustment value based on the target fraction of activated cylinders. The first APC module also determines a second APC value based on the first APC value and the APC adjustment value. The fuel control module controls fuel injection based on the second APC value and a target air/fuel mixture.
313 Citations
14 Claims
-
1. An engine control system of a vehicle, comprising:
-
a cylinder control module that determines a target fraction of activated cylinders of an engine; a first air per cylinder (APC) module that determines a first APC value based on an intake manifold pressure and an air temperature; an adjustment module that determines an APC adjustment value based on the target fraction of activated cylinders; wherein the first APC module determines a second APC value based on the first APC value and the APC adjustment value; a second APC module that determines a third APC value based on a mass air flowrate (MAF) into the engine and the target fraction of activated cylinders; a filter module that applies a filter to the third APC value to determine a fourth APC value; an air state module that transitions an air state from a first state to a second state when an intake air pressure ratio is less than a predetermined value, a change in the intake air pressure ratio is less than a second predetermined value, a change in the target fraction of activated cylinders is zero, a change in the fourth APC value is less than a third predetermined value, and a change in an intake cam phaser position is less than a fourth predetermined value; a learning module that adjusts a learn adjustment value at a first predetermined rate when the air state is in the second state and that does not adjust the learn adjustment value when the air state is in the first state; an adjusting module that adjusts the second APC value based on the learn adjustment value to produce a fifth APC value; and a fuel control module controls fuel injection based on the fifth APC value and a target air/fuel mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An engine control method for a vehicle, comprising:
-
determining a target fraction of activated cylinders of an engine; determining a first air per cylinder (APC) value based on an intake manifold pressure and an air temperature; determining an APC adjustment value based on the target fraction of activated cylinders; determining a second APC value based on the first APC value and the APC adjustment value; determining a third APC value based on a mass air flowrate (MAF) into the engine and the target fraction of activated cylinders; applying a filter to the third APC value to determine a fourth APC value; transitioning an air state from a first state to a second state when an intake air pressure ratio is less than a predetermined value, a change in the intake air pressure ratio is less than a second predetermined value, a change in the target fraction of activated cylinders is zero, a change in the fourth APC value is less than a third predetermined value, and a change in an intake cam phaser position is less than a fourth predetermined value, adjusting a learn adjustment value at a first predetermined rate when the air state is in the second state; not adjusting the learn adjustment value when the air state is in the first state; adjusting the second APC value based on the learn adjustment value to produce a fifth APC value; and controlling fuel injection based on the fifth APC value and a target air/fuel mixture. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification