The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

A valve control device controls an actuator for operating a valve based on a signal indicating a degree of opening of the valve and a signal indicating starting of an engine for which the valve. The valve control device includes a fully closed learning processing unit configured to learn a seated position at which a valve body is seated on a valve seat whenever the engine is started on the basis of the startup signal and the degree-of-opening signal, and a target value setting unit configured to set a soft-landing initiation position when the valve body is seated based on the seated position and set a target value with the valve body is decelerated from the soft-landing initiation position, and the valve body is seated at a predetermined seating speed. A control driving unit is configured to generate a drive signal based on the target value and the degree-of-opening signal.

An EGR valve includes a valve seat in a flow passage of a housing, a valve element seatable on the valve seat, a rotary shaft to open or close the valve element, a motor and a speed reducing mechanism, a return spring urging the valve element in a valve closing direction, and an opening-degree sensor to detect an opening degree of the valve element. An electronic control unit (ECU) diagnoses abnormality due to lodging of foreign matter between the valve seat and the valve element during full close. When driving the motor to urge the valve element in the valve closing direction during full close of the valve element, the ECU determines the EGR valve to be abnormal because of lodging of foreign matter if a difference between a value detected by the opening-degree sensor and a predetermined reference value is larger than a first determination value.

A system includes an electronic fuel injection system of an engine, the electronic fuel injection system including an electronic governor control unit for controlling various functions of the engine.

A wastegate opens and closes the flow path of a bypass passage that bypasses the turbine of a forced-induction device. A processor changes the drive current for the electric actuator in a stepwise manner from a state where the wastegate is stationary in a given standstill position. The amount of change in the drive current that is made until the wastegate is determined to be moved is learned as a learning value. A requested drive current for moving the wastegate to a target opening degree is corrected based on the learning value.

A valve control device includes a drive circuit for supplying a drive signal to an actuator adjusting an opening degree of a valve via a prescribed transmission line, generates a PWM signal on the basis of a target opening degree supplied from the outside and a sensor signal that indicates a real opening degree of the valve, and supplies the PWM signal to the drive circuit. The valve control device includes a disconnection detection unit which detects, on the basis of the PWM signal and a monitor signal of the drive signal, whether the transmission line is disconnected.

A variable compression ratio internal combustion engine is provided with a variable compression ratio mechanism in which a mechanical compression ratio of the internal combustion engine changes in accordance with a rotational position of a control shaft, a low compression ratio side stopper, a high compression ratio side stopper, a sensor for detecting a rotational position of a drive shaft of an actuator, and an arm press-fitted onto the drive shaft. Relative rotation between the arm and the drive shaft occurs when a torque exceeding an upper-limit torque has been applied. The drive shaft or the control shaft is caused to move to restriction positions restricted by the respective stoppers, and then a diagnosis on the presence or absence of the relative rotation is executed, based on the detected values at the respective restriction positions.

The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

An electric waste gate valve control device controls a waste gate valve provided in a waste gate passage that bypasses a portion between an upstream and a downstream of a turbine driven by exhaust of an engine and opening/closing the waste gate passage by an electric actuator. The electric waste gate valve control device includes: a position sensor that detects a position of the waste gate valve; an actuator controller that controls the electric actuator such that an opening degree of the waste gate valve becomes a target opening degree; and a fully closed position learning unit that performs fully closed position learning to acquire the position of the waste gate valve at a time when the electric actuator is driven to bring the waste gate valve into a fully closed state.

A method of controlling a continuously variable valve timing system, may include determining whether there is an error of a position of a cam, performing a passive control based on a value learned about a position of the cam during previous driving when it is determined that there is an error of the position of the cam, determining whether a motion of the continuously variable valve timing system is stopped while the passive control is performed based on the value learned about the position of the cam during the previous driving, learning the stopping position of the continuously variable valve timing system when it is determined that the motion of the continuously variable valve timing system is stopped, and learning a position for limp-home of the continuously variable valve timing system and then controlling the continuously variable valve timing system to the learned position for the limp-home.