A continuously variable valve duration (CVVD) system includes a controller configured to determine whether a learning value existing in the CVVD system is required to be verified during one of a hardware abnormality, a learning value abnormality, and a motor voltage abnormality. In particular, the controller performs a learning value verification control using a rotation detection value and switches from a learning value verification control to a re-learning control when re-learning is required.

A type II valve train assembly that selectively opens first and second intake valves and first and second exhaust valves is provided. The valve train assembly includes an intake rocker arm assembly and an exhaust rocker arm assembly. The valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation. The exhaust rocker arm assembly includes a first exhaust rocker arm, a second exhaust rocker arm and an engine brake exhaust rocker arm. A first exhaust HLA is associated with the first exhaust rocker arm. A second exhaust HLA is associated with the second exhaust valve. An exhaust actuation assembly selectively actuates to alter travel of the first and second exhaust HLAs to change a state of cylinder deactivation between activated and deactivated.

A cam phasing system is provided. In some non-limiting examples, the cam phasing system includes a planetary actuator having a first sun gear, a first set of planet gears meshed to and arranged circumferentially around the first sun gear, a first ring gear meshed with the first set of planet gears, and a second sun gear. The second sun gear is rotationally fixed. The planetary actuator further includes a second set of planet gears meshed to and arranged circumferentially around the second sun gear, a second ring gear meshed with the second set of planet gears, and an input shaft rotationally coupled to the first sun gear for rotation therewith. Rotation of the input shaft rotates the first ring gear relative to the second ring gear.

An internal combustion engine comprises a crankshaft, at least one camshaft adjustable electromechanically by an actuating gearing, an engine control unit, and a camshaft control unit for controlling an actuating motor which operates the actuating gearing. The engine control unit is linked to a device for detecting the angular position of the crankshaft, and the camshaft control unit is linked to the engine control unit. A device for detecting a reference position of the camshaft and a device for detecting the angular position of the shaft of the actuating motor are provided as sole mechanisms for detecting the angular position of the camshaft. The camshaft control unit is designed to determine the phase angle of the camshaft in relation to the crankshaft on the basis of the information items provided by said devices in combination with the detected angular position of the crankshaft and the transmission ratio of the actuating gearing.

An actuation transmission apparatus for actuating a component of a switchable valve train device of an internal combustion engine includes: a shaft rotatable by an actuation source; a contacting element for contacting the component of the switchable valve train device; and a biasing device for biasing the contacting element rotationally with respect to the shaft; wherein, in use, the biasing device becomes biased by the shaft when the actuation source rotates the shaft when the actuation source attempts to actuate the component of the switchable valve train device, via the contacting element, when the component of the switchable valve train device is not able to be actuated, whereby the biasing device is configured to cause the contacting element to actuate the component of the switchable valve train device when the component of the switchable valve train device becomes actuatable again.

A valve mechanism includes a valve, a camshaft, an intermediate swing arm located between a cam and the valve, a lift regulating mechanism and a roller assembly. The cam drives the valve to move by means of the intermediate swing arm. The roller assembly is supported by the cam, an eccentric wheel of the lift regulating mechanism and an intermediate swing arm roller. A peripheral surface of the eccentric wheel includes a lift regulating section having a start point and an end point, a maximum lift point of the lift regulating section is located between the start point and the end point, and the lift regulating section is divided into a first section which is convex and a second section having at least a part thereof concave.

A continuously variable valve duration (CVVD) system includes a controller configured to determine whether a learning value existing in the CVVD system is required to be verified during one of a hardware abnormality, a learning value abnormality, and a motor voltage abnormality. In particular, the controller performs a learning value verification control using a rotation detection value and switches from a learning value verification control to a re-learning control when re-learning is required.

An electric motor (2) has a base motor module (3) and an electronic module (18) which is electrically and mechanically connected to the base motor module (3) and comprises an electronics housing (12). The base motor module (3) comprises a flange plate (8) which forms an interference fit with the electronics housing (12). The flange plate (8) may have an opening (36) with a circumferential collar (39) which engages in a fastening passage (35) of the electronics housing (12) and forms the interference fit with the electronics housing (12).

An internal combustion engine comprises a crankshaft, at least one camshaft adjustable electromechanically by an actuating gearing, an engine control unit, and a camshaft control unit for controlling an actuating motor which operates the actuating gearing. The engine control unit is linked to a device for detecting the angular position of the crankshaft, and the camshaft control unit is linked to the engine control unit. A device for detecting a reference position of the camshaft and a device for detecting the angular position of the shaft of the actuating motor are provided as sole mechanisms for detecting the angular position of the camshaft. The camshaft control unit is designed to determine the phase angle of the camshaft in relation to the crankshaft on the basis of the information items provided by said devices in combination with the detected angular position of the crankshaft and the transmission ratio of the actuating gearing.

A valve timing adjustment device includes a driving-side rotatable body and a driven-side rotatable body. The driving-side rotatable body is configured to be rotated about a rotational axis synchronously with a drive shaft and includes a sprocket portion and a housing portion. The sprocket portion is configured to receive a drive force transmitted from the drive shaft. The housing portion is shaped in a tubular form and is formed separately from the sprocket portion. The driven-side rotatable body is configured to be rotated about the rotational axis synchronously with a driven shaft.