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A drive control apparatus for an automotive vehicle having an electric motor and an engine operated by combustion of a fuel, the drive control apparatus including a drive source selecting device for selecting an engine drive mode or a motor drive mode on the basis of a first value in the engine driv

A drive control apparatus for an automotive vehicle having an electric motor and an engine operated by combustion of a fuel, the drive control apparatus including a drive source selecting device for selecting an engine drive mode or a motor drive mode on the basis of a first value in the engine drive mode of a physical quantity relating to a condition of the engine and a second value of the same physical quantity reflecting energy conversion efficiencies of the electric motor, an electric generator and an electric energy storage device during an electricity generating mode. The physical quantity is preferably a fuel consumption amount by the engine. The drive control apparatus may also include an engine output determining device that optimizes the efficiency of the system by determining the output of the engine so as to power the vehicle and also provide surplus power to operate the electric generator and charge the electric energy storage device. An enlarging device may also be included to increase the output of the electric motor to prevent excessive charging of the electric energy storage device.

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[ What is claimed is:] [1.] A drive control apparatus for an automotive vehicle having an electric generator for generating an electric energy, an electric energy storage device for storing the electric energy generated by said electric generator, an electric motor operated as a first drive power so

[ What is claimed is:] [1.] A drive control apparatus for an automotive vehicle having an electric generator for generating an electric energy, an electric energy storage device for storing the electric energy generated by said electric generator, an electric motor operated as a first drive power source by said electric energy, and an engine operated as a second drive power source by combustion of a fuel, said apparatus having an engine drive mode in which the vehicle is driven by said engine, a motor drive mode in which the vehicle is driven by said electric motor, and an electricity generating mode in which said electric generator is operated by said engine to charge said electric energy storage device, said apparatus including drive source selecting means for selecting one of said engine drive mode, said motor drive mode and said electricity generating mode, depending upon a running condition of the vehicle, wherein said drive source selecting means selects one of said engine drive mode and said motor drive mode, on the basis of a first value in said engine drive mode of a physical quantity relating to a condition of said engine and a second value of said physical quantity reflecting energy conversion efficiencies of said electric generator, said electric motor and said electric energy storage device in said electricity generating mode, and according to a predetermined rule associated with said first and second values.