Engine system and method accounting for engine misfire
AssigneeFord Global Technologies, LLC
InventorJeff 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.
Claims11
A method for operating an engine having at least a first and second group of cylinders, the method comprising:
- operating in a first mode with the first group of cylinders combusting inducted air and injected fuel and the second group of cylinders inducting air and substantially no injected fuel;
- operating in a second mode with the second group of cylinders combusting inducted air and injected fuel and the first group of cylinders inducting air and substantially no injected fuel;
- operating in a third mode with both the first and second groups of cylinders combusting inducted air and injected fuel;
- monitoring cylinders in the first and second groups of cylinders for an engine misfire condition;
- and
- disabling said first mode if an engine misfire condition is detected in a cylinder of the first group and disabling said second mode if an engine misfire condition is detected in the second group.
A method for operating an engine having at least a first and second group of cylinders, the method comprising:
- operating in a first mode with the first group of cylinders combusting inducted air and injected fuel and the second group of cylinders inducting air and substantially no injected fuel;
- operating in a second mode with the second group of cylinders combusting inducted air and injected fuel and the first group of cylinders inducting air and substantially no injected fuel;
- operating in a third mode with both the first and second groups of cylinders combusting inducted air and injected fuel;
- monitoring cylinders in the first and second groups of cylinders for an engine misfire condition;
- and
- disabling said first mode if an engine misfire condition is detected in a cylinder of the first group and enabling operation in at least second and third modes, and disabling said second mode if an engine misfire condition is detected in a cylinder of the second group and enabling operation in at least said first and third modes.
A computer readable storage medium having instructions encoded therein for operating an engine having at least a first and second group of cylinders, the medium comprising:
- instructions for operating in a first mode with the first group of cylinders combusting inducted air and injected fuel and the second group of cylinders inducting air and substantially no injected fuel;
- instructions for operating in a second mode with the second group of cylinders combusting inducted air and injected fuel and the first group of cylinders inducting air and substantially no injected fuel;
- instructions for operating in a third mode with both the first and second groups of cylinders combusting inducted air and injected fuel;
- instructions for monitoring a cylinder in the first and second groups of cylinders for an engine misfire condition;
- and
- instructions for disabling said first mode if an engine misfire condition is detected in a cylinder of the first group and enabling operation in at least said second and third modes, and disabling said second mode if an engine misfire condition is detected in a cylinder of the second group and enabling operation in at least said first and third modes.
Dependencies are inferred from the claim text.