Electric vehicle speed control

Details Electric vehicle speed control Electric vehicle speed control

1984-09-07

1987-06-23

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318338, 318139, 318359, H02P 506, H02P 516

Patent

active

046755853

ABSTRACT:
The electric vehicle driven by a DC motor having a field winding. An electric resistance element can be switched into parallel circuit with the field winding to weaken the field and increase potential motor speed. A relay operates the switch, a Hall-effect switch responsive to motor rotation produces voltage pulses indicative of motor speed. A microcomputer counts pulses in a given time period to determine motor speed and compares the speed with that in the prior period to determine whether the motor speed is increasing or decreasing. The computer is programmed to operate the relay to close the switch as the motor speed increases above a first speed and to open the switch as motor speed subsequently decreases to a second speed lower than said first speed. The computer is programmed to respond to a third speed greater than the first speed to operate the relay to open said switch to prevent overspeed. The computer also responds to a fourth speed lower than the third speed and greater than the first speed to operate the relay to close the switch means subsequent to opening said switch at the third speed, thus restoring field weakening after the overspeed has been corrected.

REFERENCES:
patent: 3947738 (1976-03-01), Oliver
patent: 3950684 (1976-04-01), Peterson
patent: 3974429 (1976-08-01), Friend et al.
patent: 4019107 (1977-04-01), Dixon et al.
patent: 4131832 (1978-12-01), Cavil et al.
patent: 4189667 (1980-02-01), Boxer
patent: 4260937 (1981-04-01), Cavil et al.
patent: 4272707 (1981-06-01), Burgener et al.
patent: 4370603 (1983-01-01), Franz, Jr. et al.
patent: 4378517 (1983-03-01), Morton et al.
patent: 4430605 (1984-02-01), Arnold

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