An abnormality determination apparatus for an internal combustion engine in which an intake passage upstream of a supercharger and a crankcase are connected by a breather line includes: an intake flow rate detection unit that detects an intake flow rate in the intake passage; and an abnormality determination unit that determines abnormality of the breather line. The abnormality determination unit accumulates a value calculated from a rotation second-order component of a fluctuation waveform of the intake flow rate over a predetermined period of time and determines the abnormality of the breather line when the accumulated value is less than a predetermined threshold.

An abnormality determination device of an internal combustion engine in which a breather line connects an intake-air path positioned upstream from a forced-induction system and a crankcase includes an intake-air flow rate sensor that detects an intake air flow rate in the intake-air path, a pressure sensor that detects a pressure in the breather line, and an abnormality determination unit that determines abnormality of the breather line. The abnormality determination unit compares the pressure and a threshold for each flow rate, integrates a number of times the pressure becomes the threshold or greater, and determines abnormality of the breather line when an integrated value becomes a predetermined value or greater within a predetermined time. The abnormality determination unit calculates a weight coefficient for each flow rate and assigns weights to a number of times the pressure becomes the threshold or greater by using the weight coefficient.

A cylinder head cover structure for an engine includes a cylinder head cover. The cylinder head cover includes a metal cover member forming one end of the cylinder head cover in an engine length direction and a portion adjacent to the one end, and a resin cover member forming a portion of the cylinder head cover other than the metal cover member. The metal cover member is provided with a cam angle sensor attachment to which a cam angle sensor is attached, the cam angle sensor detecting a rotational position of a camshaft of the engine.

A breather canister for a crankcase of an engine is provided. The breather canister may comprise: an outer housing and a diffuser. The outer housing may comprise a wall and a floor that cooperate to define an interior chamber, the outer housing comprising an inlet coupled to the floor and defining a first passageway. The diffuser may comprise a stem defining a second passageway, the stem being coupled with the inlet such that the passageway of the inlet and the passageway of the stem are in fluid communication with each other. The wall of the outer housing may define a vent aperture that is in fluid communication with the interior chamber. The diffuser may define an upper aperture and a lower aperture that are each in fluid communication with the passageway of the stem and the interior chamber.

Methods and systems are provided for enhancing crankcase ventilation in a boosted engine. During boosted conditions, a crankcase may be ventilated via vacuum generated at an aspirator coupled in a compressor bypass passage. However, when the aspirator is plugged, pressure in the crankcase may be relieved by flowing crankcase gases through an aspirator bypass passage.

An abnormality detection device for an engine system detects an abnormality in a fuel vapor pipe connected to an intake pipe of an engine at a portion upstream of a supercharger in a flow direction of intake air. The abnormality detection device includes an intake air temperature sensor and an abnormality detection portion. The intake air temperature sensor is fitted to the intake pipe on an upstream side of the supercharger in the flow direction of intake air and detects a temperature of intake air mixed with fuel vapor introduced into the intake pipe from the fuel vapor pipe. The abnormality detection portion detects an abnormality in the fuel vapor pipe according to a detection value of intake air detected by the intake air temperature sensor.

A system in one embodiment includes at least one cylinder, a supplemental boost supply, and a supply line. The at least one cylinder is configured for use in a reciprocating internal combustion engine, and includes a combustion portion and a crank portion on opposite sides of a piston. The at least one cylinder also includes an intake port and an exhaust port in fluid communication with the combustion portion. The supplemental boost supply is configured to provide a supplemental air supply to the combustion portion of the engine when the engine is idling to increase pressure in the combustion portion. The supply line couples the supplemental boost supply to the intake port.

The oil mist separator includes a separator case, a gas inlet portion, a gas outlet portion, a separating component and a wall portion. The separator case is formed with a gas flow path. The gas inlet portion introduces the blow-by gas into the separator case on one side of the gas flow path. The gas outlet portion discharges the blow-by gas out of the separator case on the other side of the gas flow path. The separating component is disposed in the separator case and located between the gas inlet and outlet portions to separate the oil mist from the blow-by gas when the blow-by gas flows along the gas flow path. The wall portion is erected on the bottom wall in the separator case and faces the gas outlet portion at a position leaning toward the gas outlet portion between the separating component and the gas outlet portion.

An automobile power system in a vehicle may include an intake pipe supplying external air to an engine supplying power to driving wheels, a canister connected with a fuel tank to absorb evaporation gas produced in the fuel tank, an active purging system compressing and supplying the evaporation gas absorbed in the canister to the intake pipe, a diverging line extending from the active purging system to the engine, a diverging valve mounted on the diverging line, and a starting motor rotating a crankshaft when the engine is started. In addition, the evaporation gas absorbed in the canister is supplied to the engine through the diverging line before the engine is restarted, and then the starting motor is operated.

An integrated heater and pressure sensor assembly for a positive crankcase ventilation (PCV) system for a vehicle internal combustion engine includes a heater assembly configured to fluidly couple a PCV/makeup air (MUA) line and a vehicle air induction system line, the heater assembly configured to heat fluid passing into and out of the PCV/MUA line, and a pressure sensor assembly integrated directly into the heater assembly, the pressure sensor assembly configured to sense pressure pulsations in the PCV/MUA line.