A motor controller includes a temperature sensor configured to detect a temperature of a motor. An intermittent operation circuit allows the motor to intermittently operate at a rotation speed up to a phase before the motor reaches a rated rotation speed when it is detected that the motor temperature is at a low temperature range. The intermittent operation circuit includes a position fixing circuit configured to allow a constant electric current to flow through stator coils and to fix the motor in a stopped state. The intermittent operation circuit further includes a forced commutation circuit that allows the motor to rotate at a rotation speed up to the start-up rotation. The position fixing circuit allows the constant electric current to have a greater value as the temperature detected by the temperature sensor is lower, and allows the position fixing circuit and the forced commutation circuit to operate alternately.

The evaporated fuel processing device may include a pump unit including a pump body configured to pump out evaporated fuel generated in a fuel tank to an intake passage, and a pump controller configured to drive the pump body; and a controller configured to cause the pump controller to control the pump body. When an index related to a temperature of the pump unit exceeds a predetermined range, the controller may restrict the driving of the pump body.

A leakage detector for fuel vapor treatment device is configured to diagnose a leakage of a fuel vapor in a vapor path based on an internal pressure change of the vapor path with the vapor path functioning as a closed space. The leakage detector performs the leakage diagnosis of the vapor path by correcting the effect of the pressure of the fuel vapor with regards to the internal pressure change. The leakage detector comprises a vaporization promoting device and is configured to determine whether the fuel vapor in the gas space of a fuel pump has reached a saturated state.

Methods and systems are provided for diagnosing leaks in a fuel system. In one example, a method may include monitoring a fuel level in a vehicle fuel tank of the fuel system during refueling and indicating degradation of the vehicle fuel tank and/or a bellows coupled to the vehicle fuel tank based on the monitored fuel level. In some examples, indicating the degradation may further be based on a rate of fuel supplied to the vehicle fuel tank during the refueling and/or a vehicle fuel economy. In this way, degradation to the vehicle fuel tank and the bellows may be passively determined with minimal specialized components in the fuel system.

Methods and systems are provided for reducing evaporative emissions from a vehicle. In one example, the vehicle may include a system for capturing emissions including a plurality of vacuum ports coupled to a vacuum source. The plurality of vacuum ports may be disposed in vehicle components prone to emitting hydrocarbon vapors and activation of the vacuum source draws the vapors from the vehicle components to a fuel canister where the evaporative emissions are stored until the fuel canister is purged.

A fuel tank isolation valve (FTIV) and methods of operation are provided. The FTIV includes first and second solenoid valves with the movable valve member of one of the solenoid valves seating against a movable valve member of the other one of the solenoid valves. One of the solenoid valves may be refueling valve allowing for evacuation of fuel vapor during refueling operations as well as to allow for purging high vapor pressure within the fuel tank. One of the solenoid valves may be a proportional valve used to control the flow of fuel vapor to an intake manifold of an operating internal combustion engine as well as to reduce a vacuum generated within the fuel tank.

Methods and systems are provided for reducing a potential for release of undesired evaporative emissions to atmosphere for vehicles that rely primarily on an electric-only mode of operation for vehicle propulsion. In one example, a method may include in response to a vehicle-on request via a driver of a vehicle, maintaining off a fuel pump that supplies a fuel to a set of port fuel injectors, and re-pressurizing the set of port fuel injectors via operation of the fuel pump based on a predicted engine-start request during a drive cycle following the vehicle-on request. In this way, escape of fuel from pressurized port fuel injectors may be reduced or avoided during engine-off conditions, which may reduce opportunity for release of undesired evaporative emissions to atmosphere.

A ventilation flow rate regulator for a pressurised tank of a vehicle. The regulator includes a body including a gas inlet and a gas outlet, and at least one restrictor mounted movably relative to the body. The restrictor is mounted to reduce a cross-section of at least one path of a gas flow proceeding from the inlet to the outlet, when a flow rate at the inlet is greater than a predetermined threshold. The regulator is arranged so that the cross-section remains non-zero irrespective of a flow rate.

A charge forming device includes a housing having an inlet chamber in which a supply of fuel is received, a vent passage communicating with the inlet chamber and a throttle bore with an inlet through which air is received, a throttle valve carried by the housing with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore, a vent valve. The vent valve is carried by the housing and has a valve element that is movable between an open position wherein fluid may flow from the inlet chamber through the vent passage and a closed position where fluid is prevented or inhibited from flowing out of the inlet chamber through the vent passage, the vent valve being electrically actuated, and wherein the vent valve is actuated as a function of a pressure within the inlet chamber or the vent passage.

A vapor fuel processing device may comprise a canister for absorbing vapor fuel, a purge pipe, a purge control valve, a pump, a pressure sensor, and a determination unit. The purge control valve may switch between a communicated state in which the canister and the intake pipe are communicated and a cutoff state in which communication between the canister and the intake pipe is cut off. The pump may be provided on the purge pipe upstream of the purge control valve. The pressure sensor may be provided between the purge control valve and the pump. The determination unit may determine a state of a purge path by comparing a first detected value of the pressure sensor detected when the pump is driven with the purge control valve in the cutoff state with a first reference value and then comparing a second detected value of the pressure sensor detected when the pump is driven with the purge control valve in the communicated state with a second reference value.