A leakage diagnosis device for an evaporative fuel treatment device includes a first vent valve, a second vent valve, and a pump. The first vent valve is configured to block a first atmospheric passage, which is a main passage of an atmospheric passage and connects a canister with an atmospheric opening. The second vent valve is configured to block a second atmospheric passage, which is a bypass passage of the first atmospheric passage and connects the canister with the atmospheric opening. The pump is provided on a side of the atmospheric opening relative to the second vent valve in the second atmospheric passage, and is configured to pressurize or depressurize the second atmospheric passage. A malfunction diagnosis device performs a malfunction diagnosis based on an output value of a pressure sensor, a current value of the pump, or an output value of an air-fuel ratio sensor.

Systems and methods for waking a controller from a sleep mode are described. In one example, the controller may be woke in response to an estimated amount of time that it will take for a temperature in an evaporative emissions system to be within a threshold temperature of ambient temperature.

A fuel vapor emissions control device includes: —an absorbent filter; —a purge circuit including: a pump equipped with an intake and with a delivery outlet; an upstream duct; and a downstream duct. The pump includes an intake chamber into which the intake opens. The upstream duct is connected by one of its ends to the absorbent filter and via the other of its ends opens into the intake chamber. The downstream duct includes a double tubular wall defining two separate conduits.

A compressor arrangement for an internal combustion engine, including a compressor which is located in a compressor housing and has a low pressure side and a high pressure side, and includes a vacuum supply device which has: a propellant channel which has a nozzle and is fluidically connected on one side via a propellant inlet connection to the high pressure side of the compressor and on the other side via a propellant outlet connection to the low pressure side of the compressor; and a vacuum channel opening into the propellant channel fluidically between the propellant inlet connection and the propellant outlet connection.

A leak hole determination device in an evaporated fuel processing system. The leak hole determination device includes: a first pressure detector for detecting a first pressure in a fuel tank; a second pressure detector for detecting a second pressure in a canister; and a leak hole determiner for determining whether a leak hole is present. The leak hole determiner determines, after a limit pressure timing subsequent to a depressurization operation for depressurizing an inside of the system, whether a leak hole is present by using a difference between a change speed of a first pressure detected by the first pressure detector and a change speed of a second pressure detected by the second pressure detector.

A dual path fuel vapor purge system is disclosed for an engine having a turbocharger or a super. The purge system includes a canister configured to collect fuel vapor from a fuel tank. A canister purge valve is provided downstream from the canister. An ejector valve receives fuel vapors from the canister through the canister purge valve. A first vapor purge path directs the fuel vapor to an intake manifold of the engine. A second vapor purge path directs fuel vapor to an air induction system. A check valve downstream from the ejector valve receives the fuel vapor from the ejector and supplies the fuel vapor to the air induction system. Boost flow opens the check valve when the air induction system is in operation to boost the engine and closes the check valve when the engine is in operation with normal aspiration or when a leak is detected.

The present disclosure provides a fuel vapor processing system. The system includes a tank passage, a canister, a purge passage, an air passage, a purge valve, a controller, a fuel vapor processing portion, a pressure sensor, a fuel refill detecting portion, and an abnormality detecting portion. The fuel refill detecting portion detects that fuel refill to the fuel tank is started or fuel refill to the fuel tank is being performed by executing a fuel refill detecting process. An abnormality detecting portion detects, by executing an abnormality detecting process, a clogged situation where the tank passage is clogged based on a signal from the pressure sensor received after the fuel refill detecting portion detected that the fuel refill to the fuel tank was started.

An engine device is provided with a fuel vapor processor comprising a first supply pipe configured to supply a vaporized fuel gas including fuel vapor generated in a fuel tank, to a downstream side of a compressor in an intake pipe; a first valve provided in the first supply pipe; a second supply pipe configured to supply the vaporized fuel gas to an upstream side of the compressor in the intake pipe; and a second valve provided in the second supply pipe. When a supercharger operates and the first valve is closed, the engine device performs abnormality diagnosis of the second valve, based on a control state of the second valve and a pressure in the fuel tank.

Methods and systems are provided for a fuel system. In one example, a method may include cleaning an orifice of an ELCM. The cleaning includes adjusting a position of a valve in a passage to fluidly couple a reference orifice of the ELCM to an intake manifold.

Methods and systems are provided for executing a leak test diagnostic of a variable volume fuel tank. In one example, a method includes diagnosing a presence of an absence of a leak in a bellows via actuating a bellows valve fluidly coupling the bellows to a vapor canister during a key-off event.