Abstract: In a motor driver of the present invention, voltage and current values measured by a voltage and current detector and a voltage value measured by a voltage detector are determined as first measurement results, in the state of turning on semiconductor switching elements connected between a positive terminal of a capacitor and motor coils. Voltage and current values measured by the voltage and current detector and a voltage value measured by the voltage detector are determined as second measurement results, in the state of, as to a group A, turning on a semiconductor switching element connected between the positive terminal of the capacitor and the motor coil, and as to a group B, turning on semiconductor switching elements connected between a negative terminal of the capacitor and the motor coil. The insulation resistance values are calculated between the motor coils of each group A or B and a ground.

Abstract: In a motor driver of the present invention, voltage and current values measured by a voltage and current detector and a voltage value measured by a voltage detector are determined as first measurement results, in the state of turning on semiconductor switching elements connected between a positive terminal of a capacitor and motor coils. Voltage and current values measured by the voltage and current detector and a voltage value measured by the voltage detector are determined as second measurement results, in the state of, as to a group A, turning on a semiconductor switching element connected between the positive terminal of the capacitor and the motor coil, and as to a group B, turning on semiconductor switching elements connected between a negative terminal of the capacitor and the motor coil. The insulation resistance values are calculated between the motor coils of each group A or B and a ground.

Abstract: It is an object of the invention to provide a structure for connecting a compressor wheel and a shaft, which structure is not easily broken when rotated at high speed. A male screw is provided on an outer surface of a projection formed on the center of a rear of the compressor wheel, and a male screw is provided on a shaft. The compressor wheel and the shaft are connected with each other by a sleeve having female screws provided at each end thereof. An engagement portion is provided between the compressor wheel and the shaft.

Abstract: It is an object of the invention to provide a structure for connecting a compressor wheel and a shaft, which structure is not easily broken when rotated at high speed. A male screw is provided on an outer surface of a projection formed on the center of a rear of the compressor wheel, and a male screw is provided on a shaft. The compressor wheel and the shaft are connected with each other by a sleeve having female screws provided at each end thereof. An engagement portion is provided between the compressor wheel and the shaft.

Abstract: A diesel engine with a supercharger, which hardly has an adverse effect on performance even if a fuel of inferior ignitability is used, is provided. For this purpose, the diesel engine includes a supercharger (1) for supplying pressurized supercharged air into a cylinder (31), and a heat exchanger, which is provided in a supercharged air passage from an outlet port of the supercharger to an inlet port of the cylinder, and the heat exchanger is a hybrid type of heat exchanger (2) including a first heat exchanger (2a) for carrying out heat exchange between the supercharged air from the outlet port of the supercharger and a first heat exchange medium, and a second heat exchanger (2b) for carrying out heat exchange between the supercharged air from an outlet port of the first heat exchanger and a second heat exchange medium having higher temperature than the first heat exchange medium.

Abstract: A diesel engine with a supercharger, which hardly has an adverse effect on performance even if a fuel of inferior ignitability is used, is provided. For this purpose, the diesel engine includes a supercharger (1) for supplying pressurized supercharged air into a cylinder (31), and a heat exchanger, which is provided in a supercharged air passage from an outlet port of the supercharger to an inlet port of the cylinder, and the heat exchanger is a hybrid type of heat exchanger (2) including a first heat exchanger (2a) for carrying out heat exchange between the supercharged air from the outlet port of the supercharger and a first heat exchange medium, and a second heat exchanger (2b) for carrying out heat exchange between the supercharged air from an outlet port of the first heat exchanger and a second heat exchange medium having higher temperature than the first heat exchange medium.

Abstract: A replicated controller and a fault recovery method therefor which can restore a faulty system to a normal state without interrupting operation of an equipment, even in an equipment controller performing processing with short operating periods.In a fault recovery method for a replicated controller, control data is divided into a plurality of blocks on the basis of dependency of the blocks, and a plurality of blocks are transferred in a sequential order of superiority of the dependency from the normally operating system to the faulty system in a period over a plurality of operating periods. BY this, even in an equipment controller performing processing at a short operating period, the system, in which failure is caused, can be restored into normal state without interrupting operation of the equipment.