Electric motor servo control system and method
This patent describes a system for maintaining the speed of a vehicle at a predetermined constant rate by controlling rotation of an electro-servo motor that is coupled to an element moveable between at least two positions by the servo motor for controlling the fuel-air mixture of the vehicle. The servo motor is responsive to a control current produced by a motor drive circuit to move the element. A means is included for interrupting the servo motor operation when the element is relatively immovable. The system comprises: element position indicating means operably coupled to the element for providing a signal having a value which varies with the position of the element; first circuit means for providing a first reference signal having a value representing when the element reaches a first extreme travel position, and for providing a second reference signal having a value representing when the element reaches a second extreme position of travel; and first comparator means operatively coupled to the element position indicating means and the first circuit means for comparing the value of the signal produced by the element position indicating means to the first reference signal and for providing a signal indicating whether the value of the signal from the element position indicating means exceeds the value of the first reference signal.
- Assignee:
- ARA Manufacturing Co. of Delaware, Inc., Grand Prairie, TX
- Patent Number(s):
- US 4656407
- OSTI ID:
- 6545814
- Resource Relation:
- Patent File Date: Filed date 14 Jun 1985
- Country of Publication:
- United States
- Language:
- English
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