Engine system and method accounting for engine misfire
First Claim
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1. 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.
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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.
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Citations
11 Claims
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1. A method for operating an engine having at least a first and second group of cylinders, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A method for operating an engine having at least a first and second group of cylinders, the method comprising:
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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. - View Dependent Claims (7, 8, 9, 10)
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11. 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:
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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.
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Specification