Fuel vapor treatment apparatus

A fuel vapor treatment apparatus comprising:

• a fuel tank for a storage of fuel to be supplied to an internal combustion engine for a vehicle;
• a canister disposed to recover fuel evaporated from the fuel tank;
• a passage forming member defining a passage through which the fuel tank and the canister communicate with each other;
• a pressure-regulating valve provided in the passage forming member to connect or disconnect the fuel tank and the canister;
• an acceleration detector provided to detect an acceleration value of the vehicle;
• a controller which controls the pressure-regulating valve based on the acceleration value detected by the acceleration detector;
• and
• a vehicle speed detector provided to detect a vehicle speed, wherein the controller controls the pressure-regulating valve based on the vehicle speed detected by the vehicle speed detector;
• wherein
• the controller includes a vehicle-speed determination section configured to determine whether the vehicle speed detected by the vehicle speed detector is equal to or larger than a vehicle speed threshold, a first determination section configured to determine whether the acceleration value detected by the acceleration detector is larger than a first acceleration threshold, and a second determination section configured to determine whether the acceleration value detected by the acceleration detector is larger than a second acceleration threshold different from the first acceleration threshold,
• the controller causes the pressure-regulating valve to be opened, when the vehicle-speed determination section determines that the vehicle speed detected by the vehicle speed detector is equal to or larger than the vehicle speed threshold and when the first determination section determines that the acceleration value detected by the acceleration detector is larger than the first acceleration threshold, and
• the controller causes the pressure-regulating valve to be opened, when the vehicle-speed determination section determines that the vehicle speed detected by the vehicle speed detector is smaller then the vehicle speed threshold and when the second determination section determines that the acceleration value detected by the acceleration detector is larger than the second acceleration threshold.