Patent ID: 9581077
Date: 2017-02-28
CPC Classifications: F01L,F02B,F02D,F02M,Y02T

Claim:
1. A variable combustion system for an internal combustion engine, comprising: a variable valve actuation control mechanism configured to control an internal EGR amount to a combustion chamber of an internal combustion engine; a variable mechanical compression ratio control mechanism configured to control a mechanical compression ratio in the combustion chamber; and a control device configured to switch a combustion form of a mixture in the combustion chamber of the internal combustion engine to any one of compression self-ignition combustion and spark ignition combustion and to control the variable valve actuating control mechanism and the variable mechanical compression ratio control mechanism, wherein the control device suppresses mechanical compression ratio change control by the variable mechanical compression ratio control mechanism and carries out internal EGR amount change control by the variable valve actuating control mechanism on a preferential basis in a first operating region in which the compression self-ignition combustion is carried out, and the control device suppresses the internal EGR amount change control by the variable valve actuating control mechanism and carries out the mechanical compression ratio change control by the variable mechanical compression ratio control mechanism on a preferential basis in a second operating region in which the spark ignition combustion is carried out.