Patent ID: 7900611

Claim:
A blow-by gas treatment apparatus for an internal combustion engine, which returns blow-by gas leaking out of a combustion chamber of the internal combustion engine into a crankcase, to an intake passage, and controls a gas flow rate of the blow-by gas on the basis of an engine operation state, the blow-by gas treatment apparatus comprising: a calculation part that calculates a total amount of oil carried from the crankcase into the intake passage by the blow-by gas based on the engine operation state from the start of the use of the internal combustion engine; a determination part that performs a determination process as to whether the total oil carried amount is greater or less than an optimum value at intervals of a predetermined operation period of the internal combustion engine; and a correction part that reduces the gas flow rate of the blow-by gas returned to the intake passage until next determination process is carried out when it is determined in the determination process that the total oil carried amount is greater than the optimum value, and that increases the gas flow rate until next determination process is carried out when it is determined in the determination process that the total oil carried amount is less than the optimum value.