Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Patent
1998-11-24
1999-11-30
Shah, Kamini
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
702 45, 702 47, 36452817, 222 1, 222 55, G06F 138, B67D 508
Patent
active
059959096
ABSTRACT:
A fluid dispensing control for controlling the dispensing of a fluid by a metering valve through a nozzle onto a workpiece. An initial value of a flow characteristic of the fluid is determined that is correlated to the relationship between the flow rate of the fluid and nozzle pressure. Desired nozzle pressure values are periodically determined by evaluating a model of flow rate of the fluid through nozzle in response to the initial value of the flow characteristic and a desired flow rate value. Thereafter, the control provides command signals to the metering valve as a function of the desired nozzle pressures. A new value of the flow characteristic is determined as a function of the measured volume of fluid dispensed during the dispensing cycle to the measured nozzle pressure. During a subsequent dispensing cycle, the control determines the desired nozzle pressures by evaluating the model of flow rate of the fluid through the nozzle as a function of the new value of the flow characteristic. The process of reevaluating the flow characteristic over successive dispensing cycles as a function of measured volumes of fluid dispensed and measured nozzle pressures, and using those updated values to reevaluate the model of flow rate of fluid through the nozzle, is repeated.
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"Automotive Fuel Injection System, A technical Guide", by Jan P. Norbye, Motorbooks International, pp. 67-85, 103-106 no date.
Bretmersky Carl A.
Hall Robert C.
Klein Richard G.
Nordson Corporation
Shah Kamini
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