Speed control device used for electric automobiles and method therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 12, 1996
Grant Date -
N/A
app pub date -
Oct 14, 1994
filing date -
Dec 22, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speed control device automatically controlling the travelling speed of overspeeding electric automobiles so as to allow the automobile to travel safely. The speed control device having a mechanical brake and motor including an input circuit for setting an electric brake request value associated with the RPM (revolution per minute) of the motor, a maximum speed value, an electric brake limit value and a maximum current value of the motor, an RPM sensing circuit for sensing a current RPM of the motor to generate an RPM sensing signal, a current sensing circuit for sensing a current flow in the motor to generate a current sensing signal, and a controller for comparing the input values supplied from the input circuit and the maximum current value with the RPM sensing signal and the current sensing signal to provide a motor driving transistor with a control signal, so that the speed control device performs an electric auxiliary brake function in addition to the mechanical brake function, thereby improving the endurance of the mechanical brake system.
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