Patent attributes
A leakage detecting device is connected to an evaporating fuel processing apparatus to detect leakage of evaporating fuel in a ventilation apparatus that includes an electric pump, a fuel tank, and a filter. The electric pump includes a pump portion and a motor portion. The pump portion is capable of generating at least one of pressurizing force and de-pressurizing force. The motor portion drives the pump portion. The filter absorbs fuel evaporating in the fuel tank. The leakage detecting device generates pressure difference between the inside of the ventilation apparatus and the outside of the ventilation apparatus in accordance with the pressurizing force and the de-pressurizing force generated using the electric pump to detect a leakage condition of the ventilation apparatus. The leakage detecting device includes a rotation speed controlling means that controls rotation speed of the motor portion at a predetermined rotation speed.
