Systems and methods for performing closed-in-bore diagnostics for a hybrid vehicle are presented. In one example, select operating conditions may be evaluated before closed-in-bore diagnostics may be initiated. In addition, charging of one or more batteries may be reduced to ensure that an engine throttle may operate with a small opening amount to evaluate the presence or absence of sludge in the engine throttle.

A control method for an internal combustion engine including: setting a target valve opening degree of the first throttle valve in accordance with a load, sensing a valve opening degree of the second throttle valve, judging whether or not the valve opening degree of the second throttle valve is an opening degree on a closing side relative to a predetermined set valve opening degree, and correcting the valve opening degree of the first throttle valve to the opening degree on the closing side relative to the target valve opening degree when it is judged that the valve opening degree of the second throttle valve is the opening degree on the closing side relative to the predetermined set valve opening degree.

A throttle valve abnormality determination device includes a permission/rejection determination unit configured to determine whether or not to permit a sticking determination of a throttle valve. The determination unit is configured to prohibit the sticking determination if a first temperature, which is a temperature in a passage through which intake air flows, is less than or equal to a freezing temperature at which the throttle valve may be frozen when an engine is started and, after prohibiting the sticking determination, permit the sticking determination if an integrated value of a heat amount conversion value based on a second temperature, which is a temperature in the passage, and an intake air amount exceeds a threshold value when the second temperature is greater than or equal to a de-freezing temperature at which a frozen portion of the throttle valve is de-frozen.

Methods and systems are provided for detecting throttle obstructions in a vehicle. In one example, after engine start up, throttle icing condition resulting from the throttle capturing ice fragments originally formed within a charge air cooler or an intake passage upstream of throttle, may be detected. Responsive to detecting the throttle icing condition, the throttle may be adjusted to a fully open position independent of accelerator pedal position, and maintained at the fully open position for a threshold duration while maintaining a desired torque, to release the captured ice fragments from the throttle.

An electrically-operated actuator rotates a valve toward its closing side or opening side. A valve urging part urges the valve from a fully-closed position toward the opening side. An ACT control part controls the electrically-operated actuator to drive. A set load of the valve urging part is smaller than a set load that is capable of returning the valve from a fully-closed position to an intermediate position only by urging force of the valve urging part. When a position of the valve at time of turning off an IG switch for stopping operation of an internal-combustion engine is on the closing side of the intermediate position, the ACT control part shifts the valve to the intermediate position by the electrically-operated actuator after the IG switch is turned off.

Systems and methods for determining the presence or absence of deposits that may accumulate within a compressor recirculation valve positioned in parallel with a turbocharger compressor are presented. The systems and methods adjust actuators to maintain engine operation such that it may be more difficult for a driver to become aware that a compressor recirculation valve diagnostic is being executed.

Methods and systems are provided for detecting throttle obstructions in a vehicle. In one example, after engine start up, throttle icing condition resulting from the throttle capturing ice fragments originally formed within a charge air cooler or an intake passage upstream of throttle, may be detected. Responsive to detecting the throttle icing condition, the throttle may be adjusted to a fully open position independent of accelerator pedal position, and maintained at the fully open position for a threshold duration while maintaining a desired torque, to release the captured ice fragments from the throttle.

Systems and methods for determining the presence or absence of deposits that may accumulate within a compressor recirculation valve positioned in parallel with a turbocharger compressor are presented. The systems and methods adjust actuators to maintain engine operation such that it may be more difficult for a driver to become aware that a compressor recirculation valve diagnostic is being executed.

Systems and methods for determining the presence or absence of deposits that may accumulate within a compressor recirculation valve positioned in parallel with a turbocharger compressor are presented. The systems and methods adjust actuators to maintain engine operation such that it may be more difficult for a driver to become aware that a compressor recirculation valve diagnostic is being executed.