Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1995-11-03
1997-05-20
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 23, 361 30, H02H 318
Patent
active
056317964
ABSTRACT:
An electric vehicle control system which maintains good driving performance under normal conditions, and can cut off driving current upon malfunction of a microcomputer before restarting. A setting circuit of a comparing and operating circuit has a set signal fixed to V2 if an accelerator pedal is released. If a microcomputer malfunctions to drive an inverter absent a depression of the accelerator pedal, a current flows from a battery and a battery current sensor generates an output signal n. If this value exceeds V2, a comparator is turned on, which also turns on a transistor to energize a relay and disconnects an inverter drive signal s to break the power supply from an inverter to the ac motor. Upon disconnection, an alarm lamp is lit to issue an alarm to the driver. The disconnection is held by a delay circuit until the power is reset.
REFERENCES:
patent: 4371824 (1983-02-01), Gritter
patent: 4500820 (1985-02-01), Noto et al.
Matsudaira Nobunori
Naito Shotaro
Obara Sanshiro
Yoshihara Shigeyuki
Gaffin Jeffrey A.
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Medley Sally C.
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