The ventilator-equipped engine is configured to: guide a blow-by gas generated in a crankcase to an intake passage through an inside of a cylinder head, an inside of a head cover, and a pressure regulating valve; and to directly introduce fresh air into an internal space of the cylinder head by providing a fresh air introduction passage that extends across the intake passage and the cylinder head.

A method of monitoring the usage of an internal combustion engine is provided. The method comprises performing an engine monitoring routine using a local monitoring device directly attached to an internal combustion engine. The engine monitoring routine includes generating a plurality of data points representative of the crankcase pressure of the internal combustion engine using a pressure sensor of the local monitoring device, processing the generated data points to determine a first value representative of a firing frequency of the internal combustion engine, generating an aggregated summary of the internal combustion engine usage based on the first value, and transmitting identification data for the local monitoring device and the aggregated summary from the local monitoring device to a remote application. The remote application processes the transmitted aggregated summary based on the transmitted identification data to determine engine speed usage data for the internal combustion engine.

A crankcase ventilation system is provided for an internal combustion engine that includes a crankcase. An internal combustion engine including such a system is also provided.

Methods and systems are provided for diagnosing the functioning of a variable displacement oil pump. In one example, a method may include commanding a change in displacement of the variable displacement oil pump during a vehicle keyed-off condition and diagnosing a degradation of the oil pump based on a corresponding change in an estimated crankcase pressure.

Flow control devices herein have a housing defining a plurality of parallel conduits. The first conduit has a normally closed check valve defined to open under a first preselected pressure differential controlling flow through the first conduit in a first direction of flow. The second conduit has a normally neutral check valve defined to open under a second preselected pressure differential in a second direction of flow that is opposite the first direction of flow. The third conduit defines a restriction profile, i.e., has a restrictor, having a third preselected pressure differential. The flow control devices are included as part of an engine system, more specifically a crankcase ventilation breach detection system.

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 time for which a rotation second-order component of a fluctuation waveform of the intake flow rate is equal to or more than a threshold over a predetermined period of time and determines the abnormality of the breather line when the accumulated value is less than a predetermined accumulation threshold.

An engine oil tiller cap for monitoring an internal combustion engine comprises: a processor; and a sensor module comprising a pressure sensor configured to sense crankcase pressure of the internal combustion engine and to output data representative of the sensed crankcase pressure to the processor. The engine oil filler cap is configured to provide a housing for the processor. The processor is configured to determine a value representative of the firing frequency of the internal combustion engine based on the output data.

A method and system for engine monitoring comprises a plurality of monitoring devices. A master monitoring device is provided which acts as a communication hub for one or more subsidiary monitoring devices. The master monitoring device is incorporated in or directly attached to the internal combustion engine and functions to sense a characteristic of the internal combustion engine. The monitoring device is configured to transmit data representative of the sensed characteristic to a remote application running on a remote device.

Systems, apparatuses, and methods are provided for implementing a system for providing a breather for a reservoir. The system includes a breather including a housing a dehumidifying element therein. The system further includes an operational sensor positioned within the housing, the operational sensor configured to output a sensor signal indicative of a measured operational parameter of the breather, and an expansion pack coupleable to the housing, the expansion pack is configured to receive the sensor signal indicative of the measured operational parameter and to transmit at least one of the measured operational parameter or a representation thereof. The system includes a control unit communicatively coupleable to the expansion pack having a processor, a display unit, and a storage. The processor executes a control application configured to receive the at least one of the measured operational parameter or representation thereof.

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.