Patent ID: 8818687
Filing Date: 2014-08-26
Classification: F02B,F02D,F02P,Y02T

Abstract:
1. A control apparatus of an internal combustion engine including a valve closing timing adjusting mechanism that adjusts a closing timing of an intake valve of the internal combustion engine, a mechanical compression ratio adjusting mechanism that adjusts a mechanical compression ratio of the internal combustion engine, and an ignition mechanism that ignites an air-fuel mixture in a combustion chamber of the internal combustion engine, the control apparatus comprising: a reference state determining unit that, according to an operation state of the internal combustion engine, determines a reference timing of the intake valve closing timing to be within a region where the timing is retarded toward a retard angle side from an intake bottom dead center by 90° crank angle or more or to be within a region where the timing is advanced toward an advance angle side from the intake bottom dead center by 90° crank angle or more, determines a reference value of the mechanical compression ratio to be within a region of 20 or more, and determines a reference timing of the ignition timing for igniting the air-fuel mixture to be within a region around a region immediately before an intake top dead center; and a control unit that respectively controls the valve closing timing adjusting mechanism and the mechanical compression ratio adjusting mechanism which allows an actual timing of the closing timing of the intake valve to agree with the reference timing of the closing timing, and which allows an actual value of the mechanical compression ratio to agree with the reference value of the mechanical compression ratio, in order to adjust a cylinder intake air quantity that is a quantity of intake air into the combustion chamber at the closing timing of the intake valve with adjusting an actual compression ratio of the internal combustion engine, and also controls the ignition mechanism which allows the ignition timing to agree with the reference timing of the ignition timing, wherein the control unit controls, in a transient operation state, when the actual value of the actual compression ratio obtained from the actual timing of the closing timing of the intake valve and the actual value of the mechanical compression ratio is shifted from the reference value of the actual compression ratio obtained by the reference timing of the closing timing of the intake valve and the reference value of the mechanical compression ratio, and the actual value of the actual compression ratio falls within a range between a predetermined lower limit value and a predetermined upper limit value, the ignition timing to be a timing different from the reference timing of the ignition timing, not to be the reference timing of the ignition timing, wherein the control unit controls, in a transient operation state, when the actual value of the mechanical compression ratio is greater than the reference value of the mechanical compression ratio, the ignition timing to be a timing at a retard angle side from the reference timing of the ignition timing in case where the actual value of the actual compression ratio is not more than the predetermined upper limit value, while the ignition timing is controlled to be a timing at a retard angle side from the reference timing of the ignition timing, or to be the reference timing of the ignition timing, and the actual timing of the closing timing of the intake valve is controlled to be a timing closer to a top dead center from the reference timing of the closing timing, in case where the actual value of the actual compression ratio is greater than the predetermined upper limit value, in order to control the actual value of the actual compression ratio to be not more than the predetermined upper limit value.