| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaporation leak check system capable of checking evaporation leak with high accuracy regardless of a size of a reference orifice.SOLUTION: An ECU 80 includes reference pressure detecting means controlling a switch valve 60 to connect a tank passage 51 and an atmospheric air passage 53, rotating a motor 40, and detecting a pressure detected by a pressure sensor 81 as a reference pressure Pr, and checking means controlling the switch valve 60 to connect the tank passage 51 and a pump passage 52, rotating the motor 40, and checking evaporation leak from a fuel tank 2 on the basis of a pressure Pt detected by the pressure sensor 81 in a state that the inside of the fuel tank 2 is decompressed, and the reference pressure Pr. Further the ECU 80 can rotate the motor 40 while switching "motor characteristic 1" in which the motor 40 is rotated with a prescribed first rotational frequency s1, and "motor characteristic 2" in which the motor 40 is rotated with a second rotational frequency s2 larger than the first rotational frequency s1. |
