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.

The disclosure concerns a method for vibration reduction in a compression ignition four- stroke internal combustion engine. The internal combustion engine comprises exhaust and intake valves controlled by exhaust and intake camshafts. The method comprises, when operating the internal combustion engine below a threshold rotational speed, steps of: changing a timing of the exhaust camshaft to advance closing of the exhaust valve, and - changing a timing of the intake camshaft to delay opening of the intake valve.

A method of predicting vehicle engine torque using an artificial neural network is provided. A data-based artificial neural network model is applied to more accurately calculate torque and reduce development costs for calibration and logics.

Methods and systems are provided for mitigating water ingestion in a variable displacement engine. In one example, a method for a vehicle may comprise: with an engine of the vehicle turned on, responsive to detection of a water wading condition through which the vehicle is passing, operating the engine in a variable displacement engine (VDE) mode with a reduced number of cylinders of the engine activated and any cylinders in excess of the reduced number of cylinders deactivated. In this way, water ingestion into the cylinders of the engine and the resulting combustion instability may be avoided during the water wading conditions.

A valve opening and closing timing control device includes a driving-side rotating body, a driven-side rotating body, a stopper configured to determine a mechanical limit of a displacement region of a relative rotation phase, a phase control mechanism configured to change the relative rotation phase, and a control unit configured to control the electric motor so as to displace the actual phase detected by a phase sensor. A limit phase at which the stopper reaches an abutting state is set in advance when rotation of the electric motor is stopped while the internal combustion engine operates. Upon executing stop control of stopping the internal combustion engine, except when the actual phase is already the limit phase, the control unit executes braking control of limiting the rotation of the electric motor by controlling an electric current to be supplied to the electric motor.

Engine controllers and control schemes are provided for managing engine state transitions requiring increased compressor pressure ratios in turbocharged engines. In some circumstances, turbo lag can be mitigated by initially transitioning the engine to an intermediate engine state that directly or indirectly increases airflow through the engine and turbocharger relative to what would be possible if the engine were immediately commanded to operate at the target engine state. After reaching a point where the desired torque is actually generated at the intermediate engine state, the operational settings are gradually reduced to the target effective firing density while increasing the operational compressor pressure ratio to the target compressor ratio.

When an engine is started, an ECU determines whether an inside of a cylinder is in a wet concerned state in which there is a concern about fuel wet, or the inside of the cylinder is in a liquid particle float state in which a large volume of floating liquid particle of fuel arise. On determination that it is in the wet concerned state, the ECU performs a first control for reducing an intake air amount as a control of an opening timing and a closing timing by using the variable valve device. On determination that it is in the floating liquid particle state, the ECU performs a second control for increasing an in-cylinder temperature as a control of the opening timing and the closing timing by using the variable valve device.

A stop control device for an internal combustion engine is structured that stops the engine in a state suitable for starting and that does not cause a crank angle to change after the engine is stopped. A four-cycle internal combustion engine includes an electric valve opening and closing timing control device that sets an opening and closing timing of either or both of an intake valve and an exhaust valve. Stop control of stopping the internal combustion engine is performed when a stop signal for stopping the internal combustion engine is acquired, and post-stop phase control of displacing the opening and closing timing of the valve opening and closing timing control device in either an advancing direction or a retarding direction is performed after the internal combustion engine is stopped by the stop control.

The present disclosure provides systems and methods to compensate for backlash within a cam phasing system. For example, compensating for backlash by commanding a predetermined amount of additional actuator movement to account for backlash within a cam phaser. According to some aspects, a spring is provided within a cam phaser to unidirectionally take up the backlash within the cam phasing system.

The present invention refers to a charge changing control device for a reciprocating engine, comprising at least one cam follower configured for being pivotably actuated around a pivot axis (P) upon rotational movement of a camshaft, and an adjustment unit configured for setting at least three different charge-changing modes of the device by translationally displacing the pivot axis relative (P) to a rotational axis (R) of the camshaft.