Blow-by gas humidity estimation device and blow-by gas humidity estimation method

摘要

PROBLEM TO BE SOLVED: To estimate blow-by gas humidity. A blow-by gas humidity estimating apparatus 100 in an internal combustion engine 1 uses a fuel combustion moisture obtained by dividing a moisture concentration of exhaust gas recirculation gas, a moisture concentration of intake air, and a moisture amount generated by combustion of fuel by an exhaust flow rate. It is configured to execute a first step of calculating the water content of the blow-by gas based on the concentration and a second step of estimating the humidity of the blow-by gas based on the water content of the blow-by gas. .. [Selection diagram] Figure 1