Abstract: An abnormality diagnosis apparatus for diagnosing abnormality of a secondary air supply assembly includes an abnormality diagnosing unit, an air-fuel ratio learning/correcting unit, a learning degree computing unit, and a prohibition unit. The abnormality diagnosing unit diagnoses abnormality of the secondary air supply assembly based on an output of the air-fuel ratio detecting unit. The air-fuel ratio learning/correcting unit learns variation of an air-fuel ratio control system of the engine and corrects variation of an air-fuel ratio based on a result of learning the variation of the air-fuel ratio control system. The learning degree computing unit computes a learning degree, by which the air-fuel ratio learning/correcting unit learns the variation of the air-fuel ratio control system. The prohibition unit prohibits the abnormality diagnosis or makes a diagnostic result invalid when the learning degree is equal to or less than a predetermined value.

Abstract: An abnormality diagnosis apparatus for diagnosing abnormality of a secondary air supply assembly includes an abnormality diagnosing unit, an air-fuel ratio learning/correcting unit, a learning degree computing unit, and a prohibition unit. The abnormality diagnosing unit diagnoses abnormality of the secondary air supply assembly based on an output of the air-fuel ratio detecting unit. The air-fuel ratio learning/correcting unit learns variation of an air-fuel ratio control system of the engine and corrects variation of an air-fuel ratio based on a result of learning the variation of the air-fuel ratio control system. The learning degree computing unit computes a learning degree, by which the air-fuel ratio learning/correcting unit learns the variation of the air-fuel ratio control system. The prohibition unit prohibits the abnormality diagnosis or makes a diagnostic result invalid when the learning degree is equal to or less than a predetermined value.

Abstract: A supercharging pressure controller of an internal combustion engine estimates time to execute a process of bringing power supplied to an assist motor to zero based on delay characteristics of actual emission energy immediately before actual supercharging pressure reaches target supercharging pressure. The supercharging pressure controller sets a gradient of a power gradual reduction waveform in a power gradual reduction control period at a gradient for bringing the power supplied to the assist motor to zero at the estimated time. Thus, the power supplied to the assist motor gradually reduces at the predetermined gradient over time finally to zero at the estimated time. The assist motor is turned off while the actual supercharging pressure follows the target supercharging pressure, without wastefully consuming electric energy.

Abstract: As the integral value of power obtained by integrating supply power to the three-phase stator coil of an assist motor with respect to time becomes larger, a motor temperature becomes higher. Then, the integral value of power obtained by integrating supply power to the three-phase stator coil of the assist motor with respect to time is detected and when this detected integral value of power is equal to or larger than a first determination value, supply power to the three-phase stator coil of the assist motor is limited. Then, when this detected integral value of power is equal to or larger than a second determination value, supply power to the three-phase stator coil of the assist motor is stopped.

Abstract: A supercharging pressure controller of an internal combustion engine estimates time to execute a process of bringing power supplied to an assist motor to zero based on delay characteristics of actual emission energy immediately before actual supercharging pressure reaches target supercharging pressure. The supercharging pressure controller sets a gradient of a power gradual reduction waveform in a power gradual reduction control period at a gradient for bringing the power supplied to the assist motor to zero at the estimated time. Thus, the power supplied to the assist motor gradually reduces at the predetermined gradient over time finally to zero at the estimated time. The assist motor is turned off while the actual supercharging pressure follows the target supercharging pressure, without wastefully consuming electric energy.

Abstract: As the integral value of power obtained by integrating supply power to the three-phase stator coil of an assist motor with respect to time becomes larger, a motor temperature becomes higher. Then, the integral value of power obtained by integrating supply power to the three-phase stator coil of the assist motor with respect to time is detected and when this detected integral value of power is equal to or larger than a first determination value, supply power to the three-phase stator coil of the assist motor is limited. Then, when this detected integral value of power is equal to or larger than a second determination value, supply power to the three-phase stator coil of the assist motor is stopped.