Patent ID: 11951498
Assignee: GRACO MINNESOTA INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A spray gun system comprising:
a spray gun configured to distribute a mixture of air and fluid onto a working surface;
a pressure sensor fluidly connected to the spray gun, wherein the pressure sensor is configured to measure fluid pressure within the spray gun system; and
a controller electrically connected to the pressure sensor, wherein the controller is configured to:
receive a measured pressure from the pressure sensor;
calculate pressure error based on the measured pressure and a pressure set-point;
compare the pressure error to an error threshold;
increment an increment counter if the pressure error exceeds the error threshold;
determining that fluid is flowing through the spray gun based on the increment counter exceeding a count threshold;
perform, in response to determining that fluid is flowing through the spray gun based on the increment counter exceeding the count threshold, a flow control loop that adjusts the pressure set-point to achieve a target flow rate; and
perform a pressure control loop to adjust the fluid pressure within the spray gun system to achieve the pressure set-point.