Vehicle speed control device
An apparatus is described for automatically limiting the speed of a vehicle powered by an internal combustion engine having a spark ignition system with an ignition coil, comprising: sensor means for generating a speed signal directly representative of the speed of the vehicle comprising a series of speed signal pulses having a pulse repetition frequency proportional to the speed of the vehicle; control means for converting speed signal pulses into a DC voltage proportional to the vehicle speed; means for comparing the DC voltage to a predetermined DC voltage having substantially zero AC components representative of a predetermined maximum speed and for generating a difference signal in response thereto; and means for generating a pulse-width modulated control signal responsive to the difference signal; power means responsive to the control signal for intermittently interrupting the ignition system.
- Assignee:
- NOV; NOV-87-051284; EDB-87-072558
- Patent Number(s):
- US 4648366
- OSTI ID:
- 6672605
- Resource Relation:
- Patent File Date: Filed date 6 May 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INTERNAL COMBUSTION ENGINES
CONTROL SYSTEMS
IGNITION SYSTEMS
VEHICLES
SPEED REGULATORS
ALTERNATING CURRENT
DIRECT CURRENT
ELECTRIC POTENTIAL
PULSES
SIGNALS
VELOCITY
CONTROL EQUIPMENT
CURRENTS
ELECTRIC CURRENTS
ENGINES
EQUIPMENT
HEAT ENGINES
330100* - Internal Combustion Engines