Patent ID: 9441518
Filing Date: 2016-09-13
CPC Classification: F01N,Y02A,Y02T,Y10T

Claim Text:
1. A system comprising: a diaphragm pump having a suction port and a discharge port; a urea suction line fluidly coupling a urea supply to the suction port; a urea discharge line fluidly coupled to the discharge port; a recirculation line fluidly coupling the urea discharge line to the urea suction line; an exit valve operationally coupled to the urea discharge line downstream of the recirculation line; a flow regulator operationally coupled to the recirculation line; an injector valve operationally coupled to the urea discharge line downstream of the exit valve; a controller comprising: a prime loss module structured to interpret a prime loss condition of the diaphragm pump; and a flow regulator operation module structured to provide a flow regulator command in response to the prime loss condition; and a valve control module structured to selectively provide an exit valve command and an injector command in response to the prime loss condition, wherein the flow regulator is responsive to the flow regulator command, and wherein the exit valve is responsive to the exit valve command and the injector valve is responsive to the injector command, the exit valve command configured to selectively close the exit valve for a predetermined time in response to the prime loss condition and the injector command configured to selectively close the injector valve for a predetermined time in response to the prime loss condition.