5 results about "Crankcase ventilation system" patented technology

The invention relates to a jet pump for oil drainage in a crankcase ventilation system of an internal combustion engine, comprising - an inlet opening 3 for supplying oil from an oil separator of the internal combustion engine, - a propulsion nozzle 5 for supplying a propellant medium, - an outlet opening 6 for returning the oil to a cylinder head chamber 7 of the internal combustion engine, - a check valve 8 arranged at the inlet opening 3 to prevent backflow of oil, - wherein the check valve is designed as a diaphragm valve 8.

This application relates to the field of valve body technology and discloses a switching valve and a crankcase ventilation system. The switching valve includes: a housing containing a first chamber, a second chamber, and a communication port; a first interface, a second interface, and a third interface, wherein the first and second interfaces communicate with the first chamber, and the third interface communicates with the second chamber; a valve body assembly; a thermal spring; and a reset elastic assembly. The switching valve has a first state and a second state. The thermal spring is configured to heat up and deform when energized, with its second end moving away from its first end and driving the valve body assembly to move, causing the switching valve to switch from the first state to the second state. The thermal spring is configured to stop heating and recover its deformation after de-energization, and the reset elastic assembly causes the switching valve to switch from the second state to the first state. According to the embodiments of this application, the switching valve can connect to multiple ventilation pipes and can easily and correctly switch the connection relationship between the ventilation pipes.

A method for testing a crankcase ventilation system of an internal combustion engine comprising an internal combustion engine (1) with at least one combustion chamber (6) and a crankcase (9), a fresh gas line (10) for supplying fresh gas to the at least one combustion chamber (6), wherein a control valve (16) and, downstream of the control valve (16), a pressure sensor (26) are arranged in the fresh gas line (10), and a vent line (17) leading from the crankcase (9) to a section of the fresh gas line (10) located between the control valve (16) and the internal combustion engine (1), and comprising a shut-off valve (18a), is characterized in that during a starting process and / or during a stopping process of the internal combustion engine (1), the control valve (16) is set to a defined closed position and an actual pressure profile is determined by means of the pressure sensor (26) and compared with a target pressure profile.The pressure curve is compared to the position of the control valve (16) and the shut-off valve (18a) during a start or stop operation, whereby a faulty position of the shut-off valve (18a) is determined if the actual pressure curve deviates from the target pressure curve.

A jet pump for oil drainage in a crankcase ventilation system of an internal combustion engine, the jet pump including an inlet opening for supplying oil from an oil separator of the internal combustion engine, a driving nozzle for supplying a driving medium, an outlet opening for recirculation of the oil to a cylinder head chamber of the internal combustion engine, and a non-return valve arranged at the inlet opening to prevent a backflow of oil. The non-return valve is configured as a diaphragm valve.

This invention belongs to the field of automotive manufacturing technology and discloses a hydrogen engine and its control method, as well as a vehicle. The engine includes a crankcase ventilation system, a hydrogen scavenging system, and an ECU. An air filter is installed in the engine intake pipe. The crankcase injection pipe is connected to the engine intake pipe and the crankcase. Both a low-load outlet branch and a high-load outlet branch are connected in parallel to the crankcase outlet pipe and the engine intake pipe. A vacuum pump is installed on the high-load outlet branch. Hydrogen concentration sensors are respectively installed in the crankcase, on the crankcase outlet pipe, and on the intake manifold. A scavenging pipe is equipped with a scavenging pump and is connected to the hydrogen rail and the intake manifold. The low-load outlet branch is connected to the scavenging pipe. The crankcase ventilation system and the hydrogen scavenging system are electrically connected to the ECU. This invention monitors the engine hydrogen concentration. The vacuum pump delivers hydrogen from the crankcase and pipes into the cylinders for combustion. When the engine is stopped, it effectively scavenges and burns the hydrogen in the hydrogen rail, improving engine safety.