Patent ID: 7587268
Filing Date: 2009-09-08
Classification: F01L,F02D,Y02T

Abstract:
1. A control system for an internal combustion engine that is configured to be capable of changing an intake air amount by changing operating characteristics of an intake valve, using a first variable valve-actuating mechanism, and a second variable valve-actuating mechanism having a lower response speed than a response speed of the first variable valve-actuating mechanism, comprising: operation amount-detecting means for detecting an amount of operation of the second variable valve-actuating mechanism with respect to the intake valve; first control input-calculating means for calculating a first control input for controlling the first variable valve-actuating mechanism based on the detected amount of operation of the second variable valve-actuating mechanism; load parameter-detecting means for detecting a load parameter indicative of load on the engine; demanded acceleration degree parameter-calculating means for calculating a demanded acceleration degree parameter indicative of a degree of acceleration demanded of the engine; output priority-type calculation means for calculating a second control input for controlling the second variable valve-actuating mechanism, based on the detected load parameter with priority to an output of the engine; fuel economy priority-type calculation means for calculating the second control input based on the load parameter with priority to fuel economy of the engine; and selection means for selecting one of said output priority-type calculation means and said fuel economy priority-type calculation means for calculating the second control input, according to the calculated demanded acceleration degree parameter.