Slow-run system and apparatus for gaseous fueled internal combustion engines
AssigneeGarretson Equipment Co., Inc.
InventorKeith H. Garretson
Life of this patent
Estimating the term…
Abstract
A slow-run system for gaseous fueled internal combustion engines, including gaseous fuel conversions of liquid fuel engines for alternate operation on either fuel, employs a valve having an inlet receiving gaseous fuel from between the primary regulator and zero pressure governor and an outlet emptying into the air cleaner assembly upstream of the liquid fuel carburetor or equivalent means. The valve is actuated through a connection into the engine air intake manifold or similar passage below the throttle such that the valve opens to supply gaseous fuel to the air cleaner assembly during slow-run when manifold vacuum is high and remains open throughout substantially all of the engine's operating range.
Claims15
In a system for operating an internal combustion engine on gaseous fuel, the system including gaseous fuel supply means, primary regulator means, zero pressure governor means and an arrangement for slow-run of the engine, the engine including an engine air supply passage having throttle means therein for varying the supply of mixed gaseous fuel and air to the engine, the primary regulator supplying gaseous fuel to the zero pressure governor at a pressure above that in the engine air supply passage and the zero pressure governor supplying gaseous fuel through first communicating means to the engine air supply passage upstream of said throttle means, wherein the slow-run arrangement comprises:
- valve means having an inlet and an outlet, the valve inlet receiving gaseous fuel at said pressure from the primary regulator through second communicating means, and the engine air supply passage above said throttle means receiving gaseous fuel from the valve outlet through third communicating means independent of the zero pressure governor and the first communicating means effective to prevent gaseous fuel pressure in the third communicating means from influencing operation of the zero pressure governor;
- control means responsive to operation of the engine effective to close the valve means when the engine is not operating and to open the valve means for supply therefrom of gaseous fuel to said air supply passage when the engine is operating;
- and adjusting means for varying the quantity of gaseous fuel delivered through the third communicating means to said air supply passage when the valve means is open as aforesaid.
Apparatus for use in a gaseous fuel conversion of a liquid fuel internal combustion engine for operation alternately on liquid or gaseous fuel in which the conversion includes gaseous fuel primary and secondary regulators and in which the engine includes an engine air intake assembly having means for supplying a mixture of air and liquid fuel to the engine and throttle means for varying the supply of mixed air and fuel to the engine, the primary regulator supplying gaseous fuel to the secondary regulator at a pressure above that in the engine air intake assembly and the secondary regulator supplying gaseous fuel through a first passage to the engine air intake assembly upstream of said throttle means, said apparatus comprising:
- a valve assembly including gaseous fuel inlet and outlet passages having respective inner and outer ends, the inner ends of the inlet and outlet passages communicating with each other, and a valve control passage having inner and outer ends, the outer end of the valve inlet passage being adapted for connection to a primary regulator of the foregoing nature to receive gaseous fuel therefrom at said pressure through a second passage for supply of gaseous fuel to the valve inlet passage, the outer end of the valve outlet passage being adapted for connection through a third passage to an engine air intake assembly of the foregoing nature for supply of gaseous fuel thereto, the third passage being isolated from the secondary regulator and the first passage in order to avoid gaseous fuel pressure in the third passage affecting delivery of gaseous fuel by the secondary regulator to the first passage, and the outer end of the valve control passage being adapted for connection to an engine air intake assembly of the foregoing nature downstream of said throttle means thereof, the valve assembly including valve operating means movable between a first position closing off communication between the inner ends of said valve inlet and outlet passages and a second position opening communication between said valve passages, means biasing the valve operating means to its first position, said operating means being responsive to below atmospheric pressure in said valve control passage to move the valve operating means against the biasing means to its second position, and means to adjust the cross-sectional area of one of said valve inlet and outlet passages at a location therealong.
Dependencies are inferred from the claim text.