Paint flow control interface
AssigneeGeneral Motors Corporation
InventorNorman J. Weigert
Life of this patent
Estimating the term…
Abstract
Paint flow control interface circuitry for passing electrical signals across a paint booth barrier including a feedback signal indicating a paint flow parameter from a parameter transducer within the paint booth, includes passive resistive intrinsically safe barrier circuit elements coupled with buffer circuitry for minimizing the voltage drop across the interface circuitry. Light filtering of the buffer circuitry output signal with minimum filter lag yields an accurate indication of the paint flow parameter with high signal to noise ratio and minimum signal lag, for application in closed-loop paint flow control. Additional transducer voltage supply signal feedback provides for closed-loop voltage supply control across the interface circuit.
Claims11
In a paint flow control system including a controller outside a paint booth and an applicator and transducer within the paint booth, the controller for issuing a paint flow control command for controlling paint flow to the applicator in response to a transducer output signal indicating a predetermined paint flow parameter, an interface circuit for passing electrical signals into and out of the paint booth, comprising:
- a passive resistive intrinsically safe barrier element (ISB) having an input terminal electrically connected to a transducer output terminal for receiving the transducer output signal and having an output terminal;
- and
- a buffer having an input terminal electrically connected to the ISB output terminal and having an output terminal, the buffer for minimizing voltage drop of the transducer output signal across the interface circuit;
- the buffer output terminal providing an output signal for application to the controller for paint flow control.
Dependencies are inferred from the claim text.