Abstract: A control unit for a rotary electric machine includes a first current command module, a second current command module, a change module, and a return module. The first module performs a first current command on a maximum efficiency characteristic line on a d-q plane thereby to drive the machine at a maximum efficiency. The second module performs a second current command on a switching line set at a retard angle side relative to the maximum efficiency characteristic line. The change module changes a control mode from a rectangular wave voltage phase control mode to an overmodulation current control mode when an operation point of the machine reaches the switching line. The return module returns the current command from the second command to the first command after performance of the second command for a predetermined period.

Abstract: An electronic control unit is disclosed. The electronic control unit includes: a resin board; a power device that is surface-mounted on the resin board; a microcomputer that is configured to control the power device; first heat radiation means for radiating heat, the first heat radiation means being disposed on an opposite side of the resin board from the power device; and first heat conduction means for conducting the heat generated by the power device to the first heat radiation means.

Abstract: An electronic control unit is disclosed. The electronic control unit includes: a resin board; a power device that is surface-mounted on the resin board; a microcomputer that is configured to control the power device; first heat radiation means for radiating heat, the first heat radiation means being disposed on an opposite side of the resin board from the power device; and first heat conduction means for conducting the heat generated by the power device to the first heat radiation means.

Abstract: An electronic control unit is disclosed. The electronic control unit includes: a resin board; a power device that is surface-mounted on the resin board; a microcomputer that is configured to control the power device; first heat radiation means for radiating heat, the first heat radiation means being disposed on an opposite side of the resin board from the power device; and first heat conduction means for conducting the heat generated by the power device to the first heat radiation means.

Abstract: In a power source circuit for supplying electric power of a battery, a capacitor is charged by the battery when an ignition switch and a power supply relay are closed. The power supply relay is opened after the ignition switch is closed. The charge voltage of the capacitor falls, if the power supply relay has no fixed-closure abnormality. The charge voltage of the capacitor does not fall, if the power supply relay has the fixed-closure abnormality. A microcomputer diagnoses the power supply relay with respect to its fixed-closure abnormality based on the charge voltage of the capacitor when the ignition switch and the power supply relay are operated to open.

Abstract: According to this invention, a coil assembly of an ignition coil device in which a core and primary and secondary coils are unitarily molded by an insulating molding material is provided with a through hole so that the rotary shaft of a distributor or the like in which the ignition coil device is assembled can penetrate through the ignition coil device in a direction perpendicular to the main magnetic fluxes of the coils.

Abstract: According to this invention, an ignition coil device is assembled so that a rotary shaft of a distributor or the like may penetrate therethrough in a direction parallel to the main magnetic fluxes produced by coils therein, wherein, a coil assembly in which a primary coil and a secondary coil are unitarily molded by an insulating molding material is formed in a doughnut-shape, and the whole periphery of the coil assembly is covered with a core is centrally provided with a through hole for inserting said rotary shaft therethrough.

Abstract: An ignition distributor for suppressing electromagnetic waves in an internal combustion engine wherein the distributor cap includes a material which functions to absorb electromagnetic waves radiated from the spark gap between the distributing electrode and the side terminal electrodes thereof. The cap may be formed of the material alone or with other materials or may be coated at its inside and/or outside surface with the material.