Control system for variable-cylinder internal combustion engine

Details Control system for variable-cylinder internal combustion engine Control system for variable-cylinder internal combustion engine

2006-09-12

2006-09-12

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

Reexamination Certificate

active

07104244

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 (#1to #3,and #4to #6) are put in operation, and a partial-cylinder operation mode in which some (#1to #3) of the plurality of cylinders are deactivated. During the partial-cylinder operation mode, the control system1calculates 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 (steps10to13), 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 (step14).

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