Abstract: A rotary machine control apparatus includes: a current detector detecting an alternating current flowing through a rotary machine and outputting a current detection value; a power converter supplying power to the rotary machine by applying an AC voltage based on a voltage command value; a current controller adjusting the voltage command value so that the current detection value matches a current command value; an estimator obtaining a magnetic-flux estimation value that is an estimation value of an amplitude of a magnetic flux vector in the rotary machine; and a magnetic flux controller adjusting the current command value so that the magnetic-flux estimation value matches a set magnetic-flux command value in a start-up control period from when the rotary machine is put in a state where the rotary machine rotates by inertia after interruption of power supply of the power converter until the power supply is resumed.

Abstract: A rotary machine control apparatus includes: a current detector detecting an alternating current flowing through a rotary machine and outputting a current detection value; a power converter supplying power to the rotary machine by applying an AC voltage based on a voltage command value; a current controller adjusting the voltage command value so that the current detection value matches a current command value; an estimator obtaining a magnetic-flux estimation value that is an estimation value of an amplitude of a magnetic flux vector in the rotary machine; and a magnetic flux controller adjusting the current command value so that the magnetic-flux estimation value matches a set magnetic-flux command value in a start-up control period from when the rotary machine is put in a state where the rotary machine rotates by inertia after interruption of power supply of the power converter until the power supply is resumed.

Abstract: An engine misfire detection device such that an engine misfire state can be accurately detected is obtained. The engine misfire detection device includes an engine rotational speed change amount detector that detects an engine rotational speed change amount, an engine rotational speed change amount threshold setter that sets a threshold with respect to the rotational speed change amount, and a misfire detector that compares the rotational speed change amount and the threshold, carries out a misfire determination on the engine when the rotational speed change amount exceeds the threshold, and carries out a misfire detection, wherein the misfire detector prohibits the misfire determination when a switching between a differentially locked state and an unlocked state is carried out.

Abstract: An engine misfire detection device such that an engine misfire state can be accurately detected is obtained. The engine misfire detection device includes an engine rotational speed change amount detector that detects an engine rotational speed change amount, an engine rotational speed change amount threshold setter that sets a threshold with respect to the rotational speed change amount, and a misfire detector that compares the rotational speed change amount and the threshold, carries out a misfire determination on the engine when the rotational speed change amount exceeds the threshold, and carries out a misfire detection, wherein the misfire detector prohibits the misfire determination when a switching between a differentially locked state and an unlocked state is carried out.

Abstract: An estimation unit estimates a q-axis induced-voltage estimation value and estimation torque of a PM motor. An adder adds a torque command and a first command together. The first command is calculated at a first command generation unit based on the estimation torque. A further adder adds a q-axis voltage command and a second command together. The second command is calculated at a second command generation unit based on the q-axis induced-voltage estimation value. The first and second command generation units compensate a control delay in a current control system including a current control unit and an estimation delay in the estimation unit for the estimation torque and an estimation induced voltage of the PM motor, and thereby a lack of the q-axis voltage command in a high frequency range is compensated, reducing a torque ripple effectively over a wide range of speed up to a high speed range.

Abstract: A motor control device includes an electric power converter for generating three-phase voltages based on voltage instruction-values, and for supplying them to a motor; an induced-voltage estimation unit for estimating an induced voltage of the motor, based on the voltage instruction-values and electric current feedback values; a dead-time disturbance-voltage compensation unit; and a dead-time disturbance compensation-voltage modification unit for compensating a dead-time disturbance voltage(s) generated in the electric power converter, based on a fundamental wave component of an estimated induced voltage.

Abstract: A motor control device includes an electric power converter for generating three-phase voltages based on voltage instruction-values, and for supplying them to a motor; an induced-voltage estimation unit for estimating an induced voltage of the motor, based on the voltage instruction-values and electric current feedback values; a dead-time disturbance-voltage compensation unit; and a dead-time disturbance compensation-voltage modification unit for compensating a dead-time disturbance voltage(s) generated in the electric power converter, based on a fundamental wave component of an estimated induced voltage.

Abstract: An estimation unit estimates a q-axis induced-voltage estimation value and estimation torque of a PM motor. An adder adds a torque command and a first command together. The first command is calculated at a first command generation unit based on the estimation torque. A further adder adds a q-axis voltage command and a second command together. The second command is calculated at a second command generation unit based on the q-axis induced-voltage estimation value. The first and second command generation units compensate a control delay in a current control system including a current control unit and an estimation delay in the estimation unit for the estimation torque and an estimation induced voltage of the PM motor, and thereby a lack of the q-axis voltage command in a high frequency range is compensated, reducing a torque ripple effectively over a wide range of speed up to a high speed range.

Abstract: A fuel injection control apparatus of an internal combustion engine having reduced erroneous determination and delay of discriminating/updating a gear position and thus having improved accuracy of its gear position information. The apparatus has a gear position sensor for detecting a gear position; a vehicle speed pulse sensor for detecting a vehicle speed pulse; an engine speed sensor for detecting an engine speed; first gear position calculator for determining a gear from data from the gear position sensor; second gear position calculator for determining a gear on the basis of data from the vehicle speed pulse sensor and data from the engine speed sensor; and gear position selector for deciding a gear position on the basis of the logical product of the gear position determined by the first gear position calculator and the gear position determined by the second gear position calculator.

Abstract: A fuel injection control apparatus of an internal combustion engine having reduced erroneous determination and delay of discriminating/updating a gear position and thus having improved accuracy of its gear position information. The apparatus has a gear position sensor for detecting a gear position; a vehicle speed pulse sensor for detecting a vehicle speed pulse; an engine speed sensor for detecting an engine speed; first gear position calculating means for determining a gear from data from the gear position sensor; second gear position calculating means for determining a gear on the basis of data from the vehicle speed pulse sensor and data from the engine speed sensor; and gear position selecting means for deciding a gear position on the basis of the logical product of the gear position determined by the first gear position calculating means and the gear position determined by the second gear position calculating means.

Abstract: A fuel injection apparatus for an engine includes various sensors (10), a control unit (20) and an injector (30). The control unit (20) includes a basic fuel injection quantity arithmetic means for determining a basic injection quantity conforming to the operation state, a data map (21) holding data for determining a regulating correction quantity in accordance with specific engine parameters (Th, Ne), and a correcting arithmetic means for determining the injection quantity by correcting the basic injection quantity with the data. The data map (21) includes plural areas for holding the data. Intermediate areas holding no data are provided between two adjacent data holding areas. The correcting arithmetic means includes a search means for determining interpolation data corresponding to the intermediate area through interpolation based on the data stored in two adjacent areas. The injection quantity for the intermediate area is determined by correcting the basic injection quantity with the interpolation data.

Abstract: A fuel injection apparatus for an engine includes various sensors (10), a control unit (20) and an injector (30). The control unit (20) includes a basic fuel injection quantity arithmetic means for determining a basic injection quantity conforming to the operation state, a data map (21) holding data for determining a regulating correction quantity in accordance with specific engine parameters (Th, Ne), and a correcting arithmetic means for determining the injection quantity by correcting the basic injection quantity with the data. The data map (21) includes plural areas for holding the data. Intermediate areas holding no data are provided between two adjacent data holding areas. The correcting arithmetic means includes a search means for determining interpolation data corresponding to the intermediate area through interpolation based on the data stored in two adjacent areas. The injection quantity for the intermediate area is determined by correcting the basic injection quantity with the interpolation data.