Importance

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Abstract

Disclosed is a supercharging device for a vehicle engine, for use in construction machines, etc., that has high acceleration performance, that is compactly made but provides high output, and that provides good engine braking efficiency, and a method for controlling such a supercharging device. A vehicle engine of the present invention, on which is mounted a mechanical supercharger that is driven by mechanical means using an output of the engine, comprises: a differential planetary gear device (10), which is connected to the vehicle engine (1) and which has differential limiting means (L) for distributing power that is produced by the vehicle engine for driving a mechanical supercharger (40) and for driving; and the mechanical supercharger (40), which is to be driven by the differential planetary gear device (10). When the vehicle is at a halt and when the vehicle is to move, a brake (36) is applied to a power transmission system (20) of the vehicle to increase total power output by the engine (1) by using the differential planetary gear device (10); the power output is directed to the mechanical supercharger (40) to rotate the mechanical supercharger (40); the brake (36) is released upon receipt of a start command; the engine power output is distributed by the differential planetary gear device (10) for driving the mechanical supercharger (40) and for propelling the vehicle; and the vehicle is propelled and accelerated.

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First Claim