Patent ID: 7513228
Filing Date: 2009-04-07
Classification: F01L,F02D,Y02T

Abstract:
1. An internal combustion engine, comprising: a variable lift and/or operating angle mechanism that variably controls a lift and/or operating angle of an exhaust valve in accordance with a driving condition of the engine; a variable phase mechanism that variably controls a phase of a lift center angle of the exhaust valve in accordance with the driving condition of the engine; a present position detecting section that detects a present operating position of each of the variable lift and/or operating angle mechanism and variable phase mechanism; and a controlling section that controls one of the variable lift and/or operating angle mechanism and the variable phase mechanism which operates normally such that an advance angle quantity of an exhaust valve closure timing from a top dead center becomes equal to or below a predetermined quantity when the other of the variable lift and/or operating angle mechanism and the variable phase mechanism has failed, wherein, in a case where the variable phase mechanism is fixed in a state where the phase of the lift center angle of the exhaust valve is relatively advanced, the controlling section, through the variable lift and/or operating angle mechanism, variably controls a valve lift quantity of the exhaust valve within a first variable range in which the advance angle quantity of the exhaust valve closure timing from the top dead center becomes equal to or below the predetermined quantity.