Patent ID: 8302572
Filing Date: 2012-11-06
Classification: F01L,F02B,F02D,F02F,Y02T

Abstract:
1. An internal combustion engine with a variable valve gear, comprising: a first intake valve and a second intake valve for each cylinder, configured to be driven by a first intake cam and a second intake cam, respectively; and a cam phase change mechanism configured to vary at least the phase of the second intake cam, wherein the second intake cam is set such that the open period of the second intake valve is longer than that of the first intake valve, wherein if the second intake cam is controlled for the most delayed angle by the cam phase change mechanism, the open period of the second intake valve is delayed with respect to that of the first intake valve and the closing timing of the second intake valve is delayed to a timing closer to a top dead center of a compression stroke than to a bottom dead center of the compression stroke, and wherein if the second intake cam is controlled for the most advanced angle by the cam phase change mechanism, the closing timing of the second intake valve is set to a timing substantially coincident with that of the first intake valve, such that a one-side valve-open period during which only the second intake valve is open is provided in an initial stage of the open period of the second intake valve.