A vehicle electric drive system and a hybrid engine-motor type vehicle drive system realizing simplification and miniaturization of electric parts and, moreover, reduction in cost while maintaining performances can be provided. A part 1 of wheels is driven by an engine. The wheels are driven by a mo
A vehicle electric drive system and a hybrid engine-motor type vehicle drive system realizing simplification and miniaturization of electric parts and, moreover, reduction in cost while maintaining performances can be provided. A part 1 of wheels is driven by an engine. The wheels are driven by a motor as necessary. The motor, a generator, and an accessory battery are connected to each other via a voltage step-up/step-down device. The voltage step-up/step-down device has a function of stepping up power of the battery and supplying the stepping up power to the motor, and a function of stepped down power of the generator and supplying the stepped down power to the battery and the accessories.
대표청구항▼
The invention claimed is: 1. An electric drive system for a vehicle, comprising: a generator driven with an engine for driving a vehicle; a vehicle-mounted battery used for accessories; and an electric motor for driving a vehicle, wherein said electric drive system is configured so that at least on
The invention claimed is: 1. An electric drive system for a vehicle, comprising: a generator driven with an engine for driving a vehicle; a vehicle-mounted battery used for accessories; and an electric motor for driving a vehicle, wherein said electric drive system is configured so that at least one of an output voltage of said generator and an output voltage of said battery can be stepped up to a motor-drive voltage to drive said electric motor. 2. Hybrid engine/motor type four-wheel drive system for driving either front wheels or rear wheels by an engine, and driving the other wheels by said electric drive system for a vehicle according to claim 1 as necessary. 3. An electric drive system for a vehicle, comprising: a generator driven by an engine for driving a vehicle; a vehicle-mounted battery used for accessories; and an electric motor for driving a vehicle, wherein a power supply for said electric motor is comprised of: said generator capable of outputting a motor-drive voltage for driving said electric motor by driving of said engine without a need for a dedicated motor-drive battery; and said vehicle-mounted battery for accessories capable of outputting said motor-drive voltage via a voltage step-up device. 4. An electric drive system for a vehicle, comprising: a generator driven by an engine for driving a vehicle; a vehicle-mounted battery used for accessories; and an electric motor for driving a vehicle, wherein said electric drive system is configured so that said vehicle-mounted battery is connected to a power line between said generator and said electric motor via a voltage step-up device, and a motor-drive power can be supplied to said electric motor by at least one of an output of said generator and an stepped up output of the vehicle-mounted battery. 5. An electric drive system for a vehicle in which some wheels are driven with an engine and others are driven with an electric motor, comprising: a battery for accessories mounted on a vehicle; and a generator driven by power of said engine, and serving as both of a drive power supply for said electric motor and a power supply for said accessories, wherein said electric motor and said generator are connected with said battery via a voltage step-up/step-down device, and said voltage step-up/step-down device has the following function: a function of stepping up power of said battery to supply said electric motor with the stepped up power in accordance with drive conditions; and a function of stepping down power of said generator to supply said battery and accessories with the stepped down power. 6. The electric drive system for a vehicle according to claim 5, wherein said voltage step-up/step-down device has the function of stepping up power of said battery to supply said electric motor with the stepped up power together with power output from said generator. 7. An electric drive system for a vehicle in which some wheels are driven with an engine and others are driven with an electric motor, wherein said electric motor is a motor/generator that drives with the supply of power from a generator driven by said engine or from an electric power storage device, during times of motoring, and generates regenerative power during times of regeneration, a power line between said electric motor and said electric power storage device is provided with a voltage step-up/step-down circuit, and said voltage step-up/step-down circuit is configured, according to vehicle conditions, to step up electric energy supplied as motor-drive power from said electric power storage device to said electric motor during times of motoring, and to step down regenerative power generated by said electric motor during times of regeneration to supply said electric power storage device with the stepped down power. 8. The electric drive system for a vehicle according to claim 7, wherein said voltage step-up/step-down circuit comprises: a choke coil and a capacitor for stepping up a voltage; and a semiconductor power element and a diode for switching operation of stepping up/stepping down the voltage in correspondence with motoring/regeneration of said motor by an instruction from a control unit, wherein said stepped up voltage or said stepped down voltage is controlled by performing a duty control on said semiconductor power element, and said electric power storage device is a battery used for accessories including a lamp load of the vehicle or a capacitor having capacity of accumulating voltage smaller than a motor-drive voltage for driving said electric motor. 9. The electric drive system for a vehicle according to claim 7, wherein the electric power storage device is connected to a power line between said electric motor for driving wheels and said generator as a drive power supply of said motor via said voltage step-up/step-down circuit, a control unit is also provided, which executes at least the following modes: a mode of supplying power of said electric power storage device stepped up by said voltage step-up/step-down circuit and power of said generator to said motor; a mode of stepping down power generated in said electric motor during times of regenerative braking of said electric motor by said voltage step-up/step-down circuit to supply said electric power storage device with the stepped down power, and a mode of stepping down power of said generator by said voltage step-up/step-down circuit to supply said electric power storage device with the stepped down power during times other than said motoring and regenerative braking modes, and said electric power storage device also functions as a battery of general accessories of the vehicle. 10. The electric drive system for a vehicle according to claim 7, wherein said electric power storage device is connected with a power line between said electric motor for driving wheels and said generator as a power supply of the motor via said voltage step-up/step-down circuit, and a change-over switch Sw for switching connection among said generator, said electric power storage device, and said electric motor is provided between a power line A between said electric motor and said generator, and a power line B connecting said power line A and said electric power storage device. 11. The electric drive system for a vehicle according to claim 7, wherein said electric motor is an AC motor or a DC motor controlled by an inverter. 12. An electric drive system for a vehicle in which some wheels are driven with an engine and others are driven with an electric motor, wherein said electric motor is a motor/generator that drives with the supply of power from a generator driven by said engine or from an electric power storage device, during times of motoring, and generates regenerative power during times of regeneration, said electric power storage device is one having a voltage level of accessories including a light load of the vehicle, and connected with a power line between said electric motor for driving wheels and said generator as a power supply of said motor via a voltage step-up/step-down circuit, and said voltage step-up/step-down circuit has a circuit configuration capable of switching the following voltage step-up operation and step down operation by a control signal: voltage step-down operation from a power line between said generator and electric motor toward said electric power storage device, and voltage step-up operation from said electric power storage device toward a power line between said generator and electric motor, and has a switching control means for executing the following modes: a mode of supplying power of said electric power storage device stepped up by said voltage step-up/step-down circuit and power of said generator to said electric motor; a mode of stepping down power generated in said electric motor during times of regenerative braking of said electric motor by said voltage step-up/step-down circuit to supply said electric power storage device with the stepped down power, and a mode of stepping down power of said generator by said voltage step-up/step-down circuit to supply said electric power storage device with the stepped down power during times other than said motoring and regenerative braking modes. 13. Hybrid engine/motor type vehicle drive system comprising an engine and an electric motor for driving wheels, wherein said vehicle drive system is configured so that said electric motor is driven by a battery to start a vehicle at the time of starting the vehicle, after that, rotational torque of said electric motor is transmitted to said engine, and an ignition system is operated without a need for making a starter operate, thereby starting the engine. 14. An electric drive system for a vehicle in which some wheels are driven with an engine and others are driven with an electric motor, comprising: a vehicle-mounted battery mounted on said vehicle; and a generator driven by power of said engine, and serving as both of a drive power supply for said electric motor and a power supply for accessories, wherein said generator has both of a self excitation function and a separate excitation function, and said the electric drive system is configured to switch between a self excitation mode and a separate excitation mode in accordance with drive conditions of said vehicle, in the separate excitation mode of said generator, to step up the power from said battery to supply a field winding of said generator with the stepped up power, and to drive said electric motor by generator output obtained by the stepped up power of said battery. 15. The electric drive system for a vehicle according to claim 14, wherein in the self excitation mode of said generator, when driving of said electric motor is requested and output voltage of said generator is at a voltage level of driving said electric motor, field current is passed to the field winding of said generator by an output of said generator, and the output of said generator is stepped down to a voltage level of accessories and used as a power supply of said accessories and said battery. 16. The electric drive system for a vehicle according to claim 14, wherein said electric motor drives with power supplied from said generator at the starting of the vehicle, said generator at this time is driven in said separate excitation mode and, when speed becomes predetermined speed or engine speed after starting, said generator is switched to the self excitation mode and functions as a power supply of accessories. 17. The electric drive system for a vehicle according to claim 14, wherein said electric motor drives with power supplied from said generator at the starting of the vehicle, said generator at this time is driven in said separate excitation mode, when speed of the vehicle becomes predetermined speed or engine speed after starting, said generator is switched to the self excitation mode and functions as a power supply of accessories, said electric motor drives with power supplied from said generator when the vehicle enters a hill climbing state, an output of said generator at this time is in said self excitation mode in which filed winding voltage necessary to drive said motor is obtained, and the power of said generator is stepped down and supplied to said battery and accessories. 18. An electric drive system for a vehicle in which some wheels are driven with an engine and others are driven with an electric motor, comprising: a vehicle-mounted battery mounted on said vehicle and having an accessory voltage level serving as a power supply of accessories; and a generator driven by power of said engine, and serving as both of a drive power supply for said electric motor and a power supply of said accessories, wherein said motor is a DC motor, and said generator and said battery are electrically connected to each other via a voltage step-up/step-down device, and said voltage step-up/step-down device has a function of stepping up power voltage of said battery to supply a field winding of said generator with the stepped up field current, and a function of supplying power output from said generator as it is or stepping down the power output from said generator to supply said battery and said accessories with the stepped down voltage in accordance with a driving conditions of the vehicle. 19. The electric drive system for a vehicle according to claim 18, further comprising a circuit device for maintaining output voltage of said voltage step-up/step-down device without being influenced by output voltage of said generator between an output portion of said voltage step-up/step-down device and an output portion of said generator. 20. The electric drive system for a vehicle according to claim 19, wherein said circuit device is a diode which is provided in an opposite direction when viewed from the output portion of said voltage step-up/step-down device to the output portion of said generator. 21. The electric drive system for a vehicle according to claim 18, wherein said electric drive system is configured so that said electric motor drives with power supplied from said generator at the time of starting, voltage of said battery is stepped up by said voltage step-up/step-down device to supply a field winding of said generator with the stepped up power at the time of starting, when speed of the vehicle becomes predetermined speed or engine speed after starting, said generator is switched to the self excitation mode, output of said generator is supplied as it is to said battery and said accessories via said voltage step-up/step-down device, said electric motor drives with power supplied from said generator when said vehicle enters a hill climbing state, an output of said generator at this time is in said self excitation mode in which filed winding voltage necessary to drive said motor is obtained, and the power of said generator is stepped up by said voltage step-up/step-down device to supplied said battery and accessories with the stepped down power. 22. The electric drive system for a vehicle according to claim 18, wherein said voltage step-up/step-down device has a choke coil, a smoothing capacitor, first and second switching elements, and an output capacitor, said first and second switching elements are connected in series and connected in parallel with said output capacitor, said first switching element is positioned between said choke coil and the field winding of said generator, said second switching element is in an LC circuit constructed by said choke coil and the smoothing capacitor, each of said first and second switching elements is connected in parallel with a bypass diode, said choke coil is connected to a power line connecting said first and second switching elements, and a switching element for motor, which is turned on/off by an instruction signal, is provided between said generator and armature winding of said electric motor. 23. The electric drive system for a vehicle according to claim 22, wherein said switching element for said electric motor is always in the on state when said first switch is off. 24. The electric drive system for a vehicle according to claim 23, wherein a mode of driving said electric motor is set at the time of starting of the vehicle and, at this time, said switch for motor is on, said first switching element is off, and said second switching element is repeatedly turned on/off. 25. The electric drive system for a vehicle according to claim 22, wherein in a mode in which said electric motor does not drive, said switch for motor is off, said first switching element is on, and said second switching element is off. 26. The electric drive system for a vehicle according to claim 22, wherein when the vehicle climbs and/or load on said battery is the maximum, said switch for motor is on, said first switching element is repeatedly turned on/off, and said second switching element is off. 27. An electric drive system for a hybrid engine/motor type vehicle in which either front wheels or rear wheels are driven with an engine and the other wheels of them are driven with an electric motor, comprising: a generator driven by said engine to generate electric power for driving said electric motor; a vehicle-mounted electric power storage device that outputs electric power at voltage levels used for accessories of the vehicle and that is capable of storing electric power from said generator by stepping down the electric power with a voltage step-down circuit; a voltage step-up/step-down circuit that is combined with a voltage step-up circuit and said voltage step-down circuit and that is electrically connected to said electric power storage device and an electric power line between said generator and said electric motor; a switching circuit switch-selectable one among at least a first circuit for supplying electric power from said generator to said electric motor by connecting electrically between said generator and said electric motor, a second circuit for stepping up electric power from said electric power storage device and supplying the stepped-up electric power to said electric motor by connecting electrically between said electric power storage device and said electric motor via said voltage step-up circuit, and a third circuit for stepping down electric power from said generator and supplying the stepped-down electric power to said electric power storage device by connecting electrically between said generator and said electric power storage device via said voltage step-down circuit. 28. The electric drive system for a hybrid engine/motor type vehicle according to claim 27, wherein an output voltage of said generator can be controlled variably by field current control. 29. An electric drive system for a hybrid engine/motor type vehicle in which either front wheels or rear wheels are driven with an engine and the other wheels of them are driven with a DC motor, comprising: a rectifier-equipped alternator that is driven by said engine to generate electric power for driving said DC motor; a vehicle-mounted electric power storage device that outputs electric power at voltage levels used for accessories of the vehicle and that is capable of storing electric power from said alternator by stepping down the electric power with a voltage step-down circuit; a DC-DC converter that is combined with a voltage step-up circuit and said voltage step-down circuit and that is electrically connected to said electric power storage device and an electric power line between said rectifier of said alternator and said DC motor; a switching circuit switch-selectable one among at least a first circuit for supplying electric power from said alternator to said DC motor via said rectifier by connecting electrically between said rectifier of said alternator and said DC motor, a second circuit for stepping up electric power from said electric power storage device and supplying the stepped-up electric power to said DC motor by connecting electrically between said electric power storage device and said DC motor via said voltage step-up circuit, and a third circuit for stepping down electric power from said alternator and supplying the stepped-down electric power to said electric power storage device by connecting electrically between said rectifier of said alternator and said electric power storage device via said voltage step-down circuit. 30. The electric drive system for a hybrid engine/motor type vehicle according to claim 29, wherein an output voltage of said alternator can be controlled variably by field current control. 31. An electric drive system for a hybrid engine/motor type vehicle in which either front wheels or rear wheels are driven with an engine and the other wheels of them are driven with an AC motor, comprising: an alternator which is driven by said engine to generate electric power for driving said AC motor; a vehicle-mounted electric power storage device which outputs at voltage levels used for accessories of the vehicle and that is capable of storing electric power from said alternator by stepping down the electric power with a voltage step-down circuit; a DC-DC converter that is combined with a voltage step-up circuit and said voltage step-down circuit and that is electrically connected to said electric power storage device and an electric power line between a rectifier of said alternator and an inverter for said AC motor; a switching circuit switch-selectable one among at least a first circuit for supplying electric power from said alternator to said AC motor via said inverter by connecting electrically between said rectifier of alternator and said inverter, a second circuit for stepping up electric power from said electric power storage device and supplying the stepped-up electric power to said AC motor by connecting electrically between said electric power storage device and said inverter via said voltage step-up circuit, and a third circuit for stepping down electric power from said alternator and supplying the stepped-down electric power to said electric power storage device by connecting electrically between said rectifier of said alternator and said electric power storage device via said voltage step-down circuit. 32. The electric drive system for a hybrid engine/motor type vehicle according to claim 31, wherein an output voltage of said alternator can be controlled variably by field current control.
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