Motor vehicles – Power – Electric
Patent
1994-02-10
1996-05-07
Focarino, Margaret A.
Motor vehicles
Power
Electric
180 654, 320 1, B60L 720
Patent
active
055137180
DESCRIPTION:
BRIEF SUMMARY
DETAILED EXPLANATION OF THE INVENTION
1. Industrial Field of Utilization
This invention is utilized in devices which convert mechanical energy produced during braking of an internal combustion engine into electrical energy, store this electrical energy, and supply stored electrical energy to an auxiliary acceleration device when the internal combustion engine is to be accelerated, thereby generating mechanical energy. In particular, this invention is utilized in devices in which a rotary squirrel-cage polyphase induction machine is coupled to a rotary shaft of an internal combustion engine, and in which this squirrel-cage polyphase induction machine acts as an electric generator during braking and as an electric motor during acceleration. This invention is a device which is suited to being carried by a motor vehicle equipped with an auxiliary acceleration and auxiliary braking device.
2. Prior Art
The present applicant has disclosed an electric braking and auxiliary acceleration means for motor vehicles in PCT Publication No. WO88/O6107 (PCT Application No. PCT/JP88/00157). As shown in FIG. 12, this device is equipped with a squirrel-cage polyphase induction machine 2, the rotor of which is directly connected to internal combustion engine 1; storage battery circuit 3 for storing electricity; inverter circuit 4 which converts the DC voltage of this storage battery circuit 3 to an AC voltage of a frequency suitable for inducing a rotating magnetic field with a lower rotational speed than the axial rotational speed of squirrel-cage polyphase induction machine 2, and which gives this AC voltage to squirrel-cage polyphase induction machine 2, and which converts AC power from squirrel-cage polyphase induction machine 2 to DC power; and inverter control circuit 5 which generates control signals which set the frequency of the AC-side voltage of this inverter circuit 4. This inverter control circuit 5 includes means for generating control commands from the driver to suit the operation of the motor vehicle.
Squirrel-cage polyphase induction machine 2 is also fitted with rotation sensor 6, and signals from this rotation sensor 6 are given to inverter control circuit 5, to which information from storage battery circuit 3 relating to the charge condition of the storage battery is also input.
Capacitor 7 and semiconductor switching circuit 12 are connected to the output of inverter circuit 4. Resistor 11 is also connected to the output of inverter circuit 4, via semiconductor switching circuit 12. Resistor 11 is constituted in such manner that it dissipates any excess electrical energy which is generated by heavy braking of the vehicle and which cannot be regenerated.
Detection circuit 13 for detecting the output voltage of inverter circuit 4 is also connected to storage battery circuit 3 and semiconductor switching circuit 12, and current detector 15 is provided at resistor 11 for detecting changes in current. Switching control circuit 14 is connected to current detector 15, and controls semiconductor switching circuit 12 in accordance with its detection signals. Detection circuit 13 is connected to this switching control circuit 14.
When a motor vehicle equipped with this device brakes, energy generated by the braking is recovered and stored as electrical energy, and when such a vehicle accelerates, this stored electrical energy is converted to mechanical energy, thereby supplying auxiliary motive power to the internal combustion engine which drives the axle.
That is to say, the control circuit which controls the inverter does so in such a manner that in acceleration mode, in which the squirrel-cage polyphase induction machine is used as an auxiliary driving means for the internal combustion engine, the inverter circuit provides the squirrel-cage polyphase induction machine with a rotating magnetic field which has a rotational speed that exceeds the rotational speed of the internal combustion engine; while in deceleration mode, in which the squirrel-cage polyphase induction machine is used as a braking device for the
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Obata Atsuomi
Suzuki Takayuki
Focarino Margaret A.
Hino Jidosha Kogyo Kabushiki Kaisha
Mar Michael
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