Metering Fuel by Compressibility.
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention pertains to a piston engine timed fuel injection system wherein highly compressed fuel, e.g. at 20,000 p.s.i., is temporarily stored in a chamber isolated from the pressure source. A flow valve is opened to permit part of the stored fuel to expand into the combustion space. Spring force closes the valve while the injection pressure is relatively high, e.g. about 3000 psi. Fuel injection pressure at beginning of the injection period may be very high, e.g. 20,000 psi., thereby promoting improved fuel atomization, shorter ignition delay, lower rate of pressure rise in the combustion space, smoother combustion, and lower peak pressure in the combustion chamber. By injecting fuel from an isolated chamber it is possible to accurately limit the quantity in accordance with compressibility factors.
- Reciprocating and Rotating Engines