Control system for variable-cylinder internal combustion engine
First Claim
1. A control system for a variable-cylinder internal combustion engine which is operated by switching an operation mode between an all-cylinder operation mode in which all of a plurality of cylinders are put in operation and a partial-cylinder operation mode in which some of the plurality of cylinders are deactivated, comprising:
- load-detecting means for detecting load on the engine;
first switching determination means for determining that the operation mode should be switched to the all-cylinder operation mode, when the detected load on the engine is larger than a first reference value, during the partial-cylinder operation mode;
degree-of-continuation parameter-calculating means for calculating a degree-of-continuation parameter indicative of a degree of continuation of a state where the load on the engine is within a predetermined range of load between the first reference value and a second reference value smaller than the first reference value, during the partial-cylinder operation mode;
second switching determination means for determining based on the calculated degree-of-continuation parameter whether or not the operation mode should be switched to the all-cylinder operation mode; and
switching execution means for executing switching from the partial-cylinder operation mode to the all-cylinder operation mode based on results of determinations by said first switching determination means and said second switching determination means.
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Accused Products
Abstract
A control system for a variable-cylinder internal combustion engine, which is capable of attaining excellent fuel economy by executing a partial-cylinder operation mode as long as possible, while suppressing vibration and noise during the partial-cylinder operation mode. A control system switches the operation mode of a variable-cylinder internal combustion engine between an all-cylinder operation mode in which all of a plurality of cylinders (#1 to #3, and #4 to #6) are put in operation, and a partial-cylinder operation mode in which some (#1 to #3) of the plurality of cylinders are deactivated. During the partial-cylinder operation mode, the control system 1 calculates a degree-of-continuation parameter SDTQCSNH indicative of a degree of continuation of a state where detected load TQECMDF on the engine is within a predetermined range of load between a first reference value TQCSNH and a second reference value TQCSEH smaller than the first reference value (steps 10 to 13), and determines whether or not the operation mode should be switched to the all-cylinder operation mode, based on the degree-of-continuation parameter SDTQCSNH (step 14).
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Citations
5 Claims
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1. A control system for a variable-cylinder internal combustion engine which is operated by switching an operation mode between an all-cylinder operation mode in which all of a plurality of cylinders are put in operation and a partial-cylinder operation mode in which some of the plurality of cylinders are deactivated, comprising:
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load-detecting means for detecting load on the engine;
first switching determination means for determining that the operation mode should be switched to the all-cylinder operation mode, when the detected load on the engine is larger than a first reference value, during the partial-cylinder operation mode;
degree-of-continuation parameter-calculating means for calculating a degree-of-continuation parameter indicative of a degree of continuation of a state where the load on the engine is within a predetermined range of load between the first reference value and a second reference value smaller than the first reference value, during the partial-cylinder operation mode;
second switching determination means for determining based on the calculated degree-of-continuation parameter whether or not the operation mode should be switched to the all-cylinder operation mode; and
switching execution means for executing switching from the partial-cylinder operation mode to the all-cylinder operation mode based on results of determinations by said first switching determination means and said second switching determination means. - View Dependent Claims (2, 3, 4, 5)
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Specification