A hydrogen-oxygen cycle engine. The hydrogen-oxygen cycle engine comprises a cylinder assembly, a hydrogen supply assembly, an oxygen supply assembly, a cycling medium assembly, an atomized water assembly, a condensate water recovery assembly and a control system. Said engine has the advantages of reasonable structural design, high automation degree, no carbon emission, etc., and can thoroughly solve the problem of environmental pollution. Also provided is a using method for the engine.

A method is provided for monitoring the operation of intake valves of an internal combustion engine, where at least one or more cylinders of the engine have more than one intake valve, and adapted to operate in different modes where at least one of the intake valves for a particular cylinder can be selectively activated, or deactivated so as not to open during a firing sequence for the cylinder. The method includes a) monitoring the intake manifold air pressure; b) during a time window with respect to the intake phase for said respective cylinder, determining the condition of whether the manifold pressure drops by a threshold or to a particular threshold level; and c) determining the functionality of the intake valves dependent on the outcome of step b).

A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle includes commanding a sliding camshaft actuator to perform a valve step shift, and monitoring an actuator's pin position during the valve step shift command. At least one crank angle is measured when the actuator pin position reaches or exceeds at least one predetermined pin position threshold and at least one remedial action is performed when the actuator pin position does not correlate to the at least one measured crank angle.

A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle includes commanding a sliding camshaft actuator to perform a valve step shift, and monitoring an actuator's pin position during the valve step shift command. At least one crank angle is measured when the actuator pin position reaches or exceeds at least one predetermined pin position threshold and at least one remedial action is performed when the actuator pin position does not correlate to the at least one measured crank angle.

Disclosed are two-valve, split-layout engine cooling systems, methods for making and method for operating such cooling systems, engine coolant valve assembly configurations, and vehicles equipped with an active thermal management system for cooling select powertrain components. A disclosed thermal management system includes a radiator for cooling coolant fluid, and a coolant pump for circulating coolant fluid received from the radiator. A set of conduits fluidly connect the coolant pump to an engine block, a cylinder head, and an exhaust manifold. Another set of conduits fluidly connect the engine block, cylinder head, and exhaust manifold to the radiator, coolant pump, and one or more oil heaters. A first valve assembly is operable to regulate coolant flow between the coolant pump and the radiator. A second valve assembly is operable to regulate coolant fluid flow, individually and jointly, between the engine block, cylinder head, exhaust manifold, radiator, coolant pump, and oil heater(s).

A valve motion measurement assembly is provided for a cylinder valve of an internal combustion engine provided with a valve stem and with a valve head. The valve motion measurement assembly includes a valve position sensor, a supporting bracket provided with at least one sensor seat for the valve position sensor, and a sensor target element configured to be coupled to the valve stem at a distance from the valve head to follow the motion of the cylinder valve. The valve position sensor interacts with the sensor target element for determining the position of the cylinder valve.

A sensor casing includes a lower case and an upper case that is fixed to an upper part of the lower case. A valve body includes an upper body including an accommodation space in which a sensor casing is disposed and a lower body in which an oil passage is formed. The upper body includes a stopper that prevents downward movement of the oil pressure sensor along a central axis. The sensor casing includes an engagement portion that engages with the stopper to retain the oil pressure sensor in the accommodation space.

Methods and systems are described for detecting valve actuation faults in internal combustion engines operating in a skip fire operational mode. In one aspect, for each skip fire working cycle, an expected exhaust pressure is determined for a time period corresponding to a potential exhaust event. One or more exhaust gas pressure sensors are then used to measure an actual exhaust pressure during the potential exhaust period. The actual exhaust pressure is compared to the expected exhaust pressure to determine whether a valve actuation fault has occurred. A variety of valve actuation faults can be identified using the described approach. In some embodiments pressure sensors are deployed in the runners of the exhaust manifold.

The invention relates to a method for simulating malfunctioning solenoid valves for an internal combustion engine by influencing an activation time and a deactivation time of the solenoid valve. A current with a specified modifiable current strength flows through the solenoid valve in order to achieve an opening and closing process. The closing process is forced after the current supplied to the solenoid valve is activated at the activation time, and the opening process is forced after the current supplied to the solenoid valve is deactivated at the deactivation time. The current is applied with a charging current strength prior to the activation time for the duration of a charging phase, and after the activation time, the current is increased to peak current strength and subsequently reduced to a holding current strength. Furthermore, after the deactivation time, the current strength is reduced to a deactivation current strength, and after a delay, the current strength (I) increases again as a result of induction. A variation of the value and/or duration of the current strength and/or an application of an additional magnetic force is used to simulate a premature activation, a delayed activation, a premature deactivation, and/or a delayed deactivation.

A sensor casing includes a lower case and an upper case that is fixed to an upper part of the lower case. A valve body includes an upper body including an accommodation space in which a sensor casing is disposed and a lower body in which an oil passage is formed. The upper body includes a stopper that prevents downward movement of the oil pressure sensor along a central axis. The sensor casing includes an engagement portion that engages with the stopper to retain the oil pressure sensor in the accommodation space.