ADSORPTION AMOUNT SENSOR

摘要

PROBLEM TO BE SOLVED: To accurately detect the amount of hydrocarbon adsorption and amount of moisture adsorption to the zeolite of a hydrocarbon adsorbing device even while an engine is operating. SOLUTION: A hydrocarbon adsorption amount sensor 10 for detecting the amount of hydrocarbon adsorption to the zeolite 12 of a hydrocarbon adsorbing device 4 to adsorb hydrocarbon in exhaust gases by zeolite is provided with both a plurality of electrodes 13 and 13 provided opposite to each other in the vicinity of the hydrocarbon adsorbing device 4 to carry zeolite and a sensor circuit to detect the amount of hydrocarbon absorption by a parameter which indicates changes in at least one of the resistance value and electrostatic capacitance Cs between the plurality of electrodes 13 and 13.