Hall sensors respectively output a measurement signal, a voltage level of which changes according to a rotation position of an electric motor. A rotation signal generator of a drive circuit generates a rotation speed signal and a rotation direction signal of the electric motor based on the measurement signals. A control circuit generates control signals of the electric motor according to edges of output signals of the rotation signal generator. A signal corrector corrects an excess or a shortage of the edge of the signal at the time of starting the electric motor based on: the voltage levels of the rotation speed signal and the rotation direction signal at the time of turning off and the time of turning on of an electric power source; and a rotation direction of the electric motor at the time of starting thereof.

An actuation apparatus for actuating a component of a switchable valve train device of an internal combustion engine includes: a support body for mounting on a cylinder head cover of the internal combustion engine; an actuation lever mounted to the support body for pivotal movement of the actuation lever between a first position for actuation of the component and a second position for allowing de-actuation of the component; and a biasing means for urging the actuation lever from the second position towards the first position. In use, the biasing means becomes biased when an actuation source causes the actuation lever to pivot to the second position. When the actuation source attempts to actuate the component when the component is non-actuatable, the biasing means causes the actuation lever to pivot from the second position to the first position, thereby to actuate the component when the component becomes actuatable again.

A valve timing controller includes: a driving-side rotation member synchronously rotating with respect to a crankshaft of an internal combustion engine; a driven-side rotation member disposed coaxially with a rotation axis of the driving-side rotation member, and rotating integrally with a camshaft of the engine; a phase setting mechanism setting a relative rotation phase between the driving-side and driven-side rotation members; a brushless motor driving the phase setting mechanism; a control portion controlling the brushless motor by electrifying an inverter having three sets of arm portions having high-side and low-side switching elements connected to each other in series between a first power supply line and a second power supply line connected to a potential lower than a potential of the first power supply line; and a command information acquisition section acquiring holding command information indicating a command for holding a rotor of the brushless motor in a non-rotating state.

A valve timing controller includes: a driving-side rotation member synchronously rotating with respect to a crankshaft of an internal combustion engine; a driven-side rotation member disposed coaxially with a rotation axis of the driving-side rotation member, and rotating integrally with a camshaft of the engine; a phase setting mechanism setting a relative rotation phase between the driving-side and driven-side rotation members; a brushless motor driving the phase setting mechanism; a control portion controlling the brushless motor by electrifying an inverter having three sets of arm portions having high-side and low-side switching elements connected to each other in series between a first power supply line and a second power supply line connected to a potential lower than a potential of the first power supply line; and a command information acquisition section acquiring holding command information indicating a command for holding a rotor of the brushless motor in a non-rotating state.

An electro-mechanical variable valve mechanism includes a variable valve mechanism body, a latching pin arranged in front of the variable valve mechanism body, and an inner body arranged inside the variable valve mechanism body. The latching pin reciprocates in a longitudinal direction of the variable valve mechanism body and the inner body to latch the variable valve mechanism body and the inner body.

A system and associated methods for controlling valve motion in internal combustion engines provide a pulsing component for energizing a solenoid control valve in pulsatile fashion to cause a transient pressure change in a hydraulic network linking the control valve to a common, paired set of intake and exhaust main event deactivation mechanisms, which may be provided in respective valve bridges. The pressure change results in hydraulic deactivation of main event motion of the exhaust valve while avoiding deactivation of main intake event motion and thereby preserving intake main event valve motion, and supporting use of the intake main event motion for additional braking or other operations. The systems and methods are particularly suited for engine environments that employ cylinder deactivation (CDA) combined with high-power density (HPD) engine braking.

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 HLA's to change a state of cylinder deactivation between activated and deactivated.

The present invention discloses a hydraulic valve mechanism with variable valve opening times and an internal combustion engine, which can effectively implement a single-opening working mode, a two-opening working mode or a multi-opening working mode of a valve in the same working cycle, and can implement a rapid and stable switchover among various working modes according to working condition requirements of the internal combustion engine. A main structure thereof includes a housing, a valve cam including a main protrusion and at least one auxiliary protrusion, a hydraulic rotary valve having a hydraulic switch valve function, a hydraulic drive component, a valve drive component, and the like. Oil passages of the hydraulic drive component, the hydraulic rotary valve, and the valve drive component are in communication.

A valvetrain for an internal combustion engine has a camshaft that can be rotated in a direction of rotation around an axis of rotation, at least two cam pieces arranged on the camshaft which each have at least two cams for actuating a respective gas exchange valve and which are rotationally fixedly connected to the camshaft, and an actuator via which the cam pieces can be shifted in the axial direction of the camshaft. A first of the cam pieces has a first rib protruding outwardly from a first base body of the first cam piece in the radial direction of the camshaft and the second cam piece has a second rib protruding outwardly from a second base body of the second cam piece in the radial direction of the camshaft.

A control device and a control method for variable valve timing mechanism according to the present invention obtains a first measurement of a rotational phase based on a rotational angle of the motor, obtains a second measurement of the rotational phase based on a relative relationship between a rotational angle of the crankshaft and a rotational angle of the camshaft, calibrates the first measurement based on the second measurement, obtains a derivative term proportional to a rate of change in a deviation between the first measurement and a target value, reduces change in derivative term when calibrating the first measurement based on the second measurement, and controls the motor based on a manipulated variable including the derivative term.