Multi-cylinder internal combustion engine and method for operating a multi-cylinder internal combustion engine
AssigneeFord Global Technologies, LLC
InventorsMichael Tobergte, Carsten Weber, Kay Hohenboeken, Helmut Hans Ruhland, Bert Pingen
Life of this patent
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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.
Claims20
A multi-cylinder internal combustion engine, comprising:
- 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.
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.
A method, comprising:
- 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.
Dependencies are inferred from the claim text.