A low-pressure loop EGR device for an engine with a supercharger, EGR passage, and EGR valve. An ECU controls the EGR valve to fully close, the intake valve to fully open, and the throttle valve to open at a sonic opening degree during deceleration and fuel cut-off. The ECU obtains an actual opening degree of the throttle valve based on the detected intake amount and a predetermined reference formula of valve passing flow rate. The ECU performs correction control of the throttle valve based on a throttle opening degree correction value learned from a difference of the actual opening degree and the predetermined opening degree. The ECU obtains an actual opening degree of the intake valve similarly to the above, and performs correction control of the intake valve based on an intake opening degree correction value learned by the difference between the actual opening degree and the predetermined opening degree.

A method for controlling engine torque in a vehicle during a default throttle condition includes determining whether a throttle of the engine is in a default throttle condition, determining whether the engine is producing more torque than desired if the throttle of the engine is in the default throttle condition, and applying an accessory load to the engine if the engine is producing more torque than desired in the default throttle condition.

Techniques for learning endstop position(s) of an actuator for a wastegate valve include detecting a learn condition and, in response to detecting the learn condition, performing a learn procedure for the actuator endstop position(s). The learn procedure includes commanding the actuator to a desired position past the endstop position corresponding to a fully-closed wastegate valve while rate-limiting a velocity of the actuator. When the difference reaches its maximum allowed value and the velocity falls below a fraction of its rate limit, the endstop position is learned. When the wastegate valve is requested open, the actuator is then controlled using the learned endstop position. Reference stiffness for a fully-closed wastegate valve could be obtained, and subsequent stiffness checks could then be periodically performed and, if less than the reference stiffness, a duty cycle of the actuator could be increased during open-loop control.

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.

To provide controller and control method for internal combustion engine that can suppress motor built in actuator from overheating when waste gate valve is controlled to near fully closed position or fully opened position, and can suppress from causing deterioration of fuel efficiency by consuming large power wastefully even in light load operation region in which pressure of exhaust gas is low relatively. A controller for internal combustion engine calculates basic operating amount for bringing real opening degree close to target opening degree; calculates an operating amount obtained by performing upper limitation of basic operating amount by first limit value, as final operating amount, in case of supercharging driving state; and calculates an operating amount obtained by performing upper limitation of basic operating amount by second limit value smaller than first limit value, as final operating amount, in case of non-supercharging driving state.

A prime mover control device of a work vehicle equipped with a torque converter includes: a speed ratio calculation unit that calculates a speed ratio of the torque converter; and a rotational speed limit unit that, when a speed ratio falls within a preset speed ratio range, limits a maximum rotational speed of the prime mover to be lower as compared with a maximum rotational speed set when a speed ratio falls without the preset speed ratio range. When a state in which the speed ratio calculated by the speed ratio calculation unit falls within the preset speed ratio range is maintained for a predetermined time period, the rotational speed limit unit changes a maximum rotational speed of the prime mover to a higher maximum rotational speed than the limited maximum rotational speed limited to be lower by the rotational speed limit unit.

A vehicle comprises an engine, a throttle body including a passage section and a throttle valve, and a throttle valve controller which controls opening or closing of the throttle valve, wherein the throttle valve controller includes: a memory section which contains therein a medium output control command such that the medium output control command continues to be stored in the memory section in a state in which electric power supply to the throttle valve controller is ceased, the medium output control command indicating an opening degree of the throttle valve, corresponding to a preset medium output range, and wherein the throttle valve controller controls opening or closing of the throttle valve, in accordance with the medium output control command read from the memory section, when an engine output meets a medium output condition in which the engine output is controlled to fall into the medium output range.

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.

Various methods for operating a wastegate are provided. In one example, a method of controlling a linked valve actuator system comprises adjusting the actuator near an end stop based on a learned uncertainty end stop region, the region based on operating conditions.

An evaporated fuel processing apparatus is provided with an initializer configured to increase a step number with which a stepping motor is rotated in a valve closing direction, when there is an initialization request for the blocking valve and tank pressure of the fuel tank is in a predetermined pressure range near atmospheric pressure, in comparison with when the tank pressure is out of the predetermined pressure range.