A blowby-gas reflux system 60 has: a blowby-gas reflux path 70; an atmospheric release mechanism 90 that releases, into the atmosphere, blowby gas Gb that has passed through an oil separator 80; and a control device 50. The control device 50 is provided with: a determination unit 51 that determines whether oil caulking occurs in a compressor 41 on the basis of the operating state of the compressor; and a control unit 51 that stops the release of the blowby gas into the atmosphere performed by the atmospheric release mechanism if the determination unit determines that oil caulking does not occur, and that causes the atmospheric release mechanism to release the blowby gas into the atmosphere if the determination unit determines that oil caulking occurs.

A device and a method for diagnosing a positive crankcase ventilation (PCV) breather line. The device includes: a crankcase pressure sensor that is installed on the PCV breather line including a front end connected to an intake line and a rear end connected to a crankcase and detects a pressure inside the crankcase; and a processor that diagnoses an abnormality of the PCV breather line based on the pressure of the crankcase.

An apparatus and method of determining the level of a liquid in a reservoir having curved surfaces is described, where the measuring device comprises a support having a radius of curvature conformable to the curvature of the reservoir. A float assembly is captivated to the support so that it may move freely in the vertical direction, but is constrained in rotation with respect to the support by compatible asymmetrical structural features. The float assembly includes an element that can be sensed by a sensor assembly that is positioned along the support over the length of the support encompassing the range of fluid levels to be measured.

An oil state detection device includes an index member, a lighting device that illuminates the index member, and a photographing device that photographs the index member through oil in a machine device.

An internal combustion engine includes on-off valves that configure a closed space by closing an internal space of a breather line, a pump that depressurizes or pressurizes the closed space, a pressure sensor that detects a pressure of the closed space, and an abnormality assessment element that assesses abnormality of the breather line. The abnormality assessment element assesses abnormality of the breather line based on a pressure change of the closed space in a case where the closed space is depressurized or pressurized by the pump.

An oil change system. The oil change system includes an evacuation system, a refill system, one or more sensors and a control circuit. The evacuation system includes a first quick connect fitting configured to mate with a quick connect valve of a vehicle. The refill system includes a second quick connect fitting configure to mate with the quick connect valve of the vehicle. The control circuit is coupled to the evacuation system, the refill system and the one or more sensors, and is configured to automatically identify the vehicle, determine a type, a viscosity and a volume of oil associated with the vehicle and control a volume of new oil added to the vehicle.

A system includes a valve actuation system, a pre-lubrication pump coupled to a lubrication circuit and configured to provide oil to the valve actuation system, a catalyst for receiving and treating exhaust gasses, and a controller. The controller is configured to identify an engine start request and determine whether the catalyst temperature is below a first threshold value. In response to determining that the catalyst temperature is below the first threshold value, the controller actuates the pre-lubrication pump to direct lubricant to the valve actuation system, controls the valve actuation system to deactivate at least one cylinder of an engine, and, subsequent to deactivating the at least one cylinder of the engine, cranks the engine.

A control device controls an internal combustion engine including: an elastic wave sensor arranged and configured to output a signal responsive to the strength of an acoustic emission wave produced at a sliding portion; and a variable oil pump. The control device is configured to execute an oil pressure control such that the oil pressure approaches a target oil pressure according to an engine operating condition. This oil pressure control includes a first pressure-increase processing executed where an AE correlation value correlated with the strength or occurrence frequency of the acoustic emission wave detected by the elastic wave sensor is greater than a first threshold value. The first pressure-increase processing increases the target oil pressure associated with a first engine operating condition present when the AE correlation value becomes greater than the first threshold value, as compared to when the AE correlation value is not greater than that.

A diagnostic system and method for a crankcase ventilation system of an engine having a boost system utilize a pressure sensor configured to measure a pressure in a make-up air (MUA) hose, a flow-limiting valve (i) fixedly attached to the induction system at a point upstream from the pressure sensor and proximate to an induction system end of the MUA hose and (ii) configured to limit flow through the MUA hose, and a controller configured to, in response to detecting the non-boost operating condition of the engine, obtain an initial pressure from the pressure sensor and then command the flow-limiting valve to close for a diagnostic period, during which monitor the pressure is monitored to determine a pressure drop from the initial pressure, and when the pressure drop fails to exceed a threshold during the diagnostic period, detect a malfunction indicative of a leaking or disconnected MUA hose.

A diagnostic system and method for a crankcase ventilation system of an engine having a boost system utilize a pressure sensor configured to measure a pressure in a make-up air (MUA) hose, a flow-limiting valve (i) fixedly attached to the induction system at a point upstream from the pressure sensor and proximate to an induction system end of the MUA hose and (ii) configured to limit flow through the MUA hose, and a controller configured to, in response to detecting the non-boost operating condition of the engine, obtain an initial pressure from the pressure sensor and then command the flow-limiting valve to close for a diagnostic period, during which monitor the pressure is monitored to determine a pressure drop from the initial pressure, and when the pressure drop fails to exceed a threshold during the diagnostic period, detect a malfunction indicative of a leaking or disconnected MUA hose.