MULTI-CYLINDER INTERNAL COMBUSTION ENGINE AND METHOD FOR OPERATING A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
First Claim
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1. A method, comprisingoperating a multi-cylinder internal combustion engine with applied ignition, in which an odd number n of cylinders is arranged in line;
- andduring partial-load operation when engine load is below threshold, enabling a partial cutoff of the cylinders, the partial cutoff comprising operating each cylinder only intermittently such that each cylinder is fired and cut off in turn at an interval of (2*720°
CA)/n.
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Abstract
A method for partial cylinder cutoff is provided. The method comprises operating a multi-cylinder internal combustion engine with applied ignition, in which an odd number n of cylinders is arranged in line, and during partial-load operation when engine load is below threshold, enabling a partial cutoff of the cylinders, the partial cutoff comprising operating each cylinder only intermittently such that each cylinder is fired and cut off in turn at an interval of (2*720° CA)/n.
51 Citations
20 Claims
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1. A method, comprising
operating a multi-cylinder internal combustion engine with applied ignition, in which an odd number n of cylinders is arranged in line; - and
during partial-load operation when engine load is below threshold, enabling a partial cutoff of the cylinders, the partial cutoff comprising operating each cylinder only intermittently such that each cylinder is fired and cut off in turn at an interval of (2*720°
CA)/n. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi-cylinder internal combustion engine, comprising:
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an odd number n of cylinders (n≧
3), arranged in line;an applied ignition system; a fuel system for delivering fuel to the cylinders; and a controller having computer-readable instructions stored therein, the instructions executable to; during partial-load operation when engine load is below threshold, enable a partial cutoff of the cylinders, the partial cutoff comprising operating each cylinder intermittently such that each cylinder is fired and cut off in turn at an interval of (2*720°
CA)/n, wherein each cylinder is cut off through deactivation of the applied ignition. - View Dependent Claims (12, 13, 14, 15)
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16. A method, comprising:
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operating an engine having an odd number of cylinders; at greater output, spark igniting directly injected fuel in all cylinders, with each cylinder firing only once every two crankshaft rotations in a first firing order; and at lower output, spark igniting directly injected fuel in all cylinders, with each cylinder firing only once every four crankshaft rotations in a second, different firing order. - View Dependent Claims (17, 18, 19, 20)
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Specification