Inventors:
Timothy J. Farrow - Fort Collins CO, US
Barry T. Brinks - Fort Collins CO, US
Assignee:
Woodward Governor Company - Fort Collins CO
International Classification:
F02B 43/00
Abstract:
A trim system for controlling an equivalence ratio in a fuel system is provided. The fuel system includes an air duct, a mixer disposed in the air duct, and a converter. The mixer has a reference pressure port and an air valve vacuum port. The converter has an outlet port and a bias port. The trim system comprises the mixer, the converter, a balance line, one or more orifices, and first and second trim valves. The outlet port is operably coupled to the mixer to deliver vaporized fuel to the mixer. The balance line is operably coupled to the reference pressure port, the bias port, and the air valve vacuum port. The balance line provides pressure to the bias port. The first and second trim valves are disposed in the balance line and operable such that the equivalence ratio in the fuel system is controlled.