F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/38, 123/43,
F02D 19/02 (2006.01) F02D 19/06 (2006.01) F02M 21/04 (2006.01) F02B 43/00 (2006.01)
Patent
CA 1276263
SYSTEM FOR CONTROLLING MASS FLOW RATES OF TWO GASES Abstract of the Disclosure A control system for internal combustion engines, including a first conduit for the flow of intake air, and a second conduit for the flow of natural gas to be mixed with the air for combustion. The flow of the air is variable over a range of mass flow rates during operation of the engine and an air mass sensor is positioned to sense the mass flow rate in the first conduit and generate a first flow rate signal indicat- ing the mass flow rate. A natural gas mass sensor is position- ed to sense the mass flow rate of the gas in the second conduit and to generate a second flow rate signal indicating the mass flow rate of the natural gas. The first and second flow rate signals are compared in an electronic controller that generates a control signal if the first and second flow rates vary from a predetermined ratio. The ratio is selected to provide a subs- tantially stoichiometric ratio of air and natural gas. A valve is provided to adjustably control the flow rate of the natural gas in response to the control signal to maintain the preselect- ed ratio. A sensor and shutoff valve are also provided for terminating the flow of the natural gas when its pressure falls below a predetermined pressure, allowing immediate flow of gasoline to the engine, thus assuring smooth, continued opera- tion of the vehicle. A throttle body has a natural gas distri- bution ring in the throat of the body and provides a curtain flow of gas.
525672
Miller Kenneth E.
Smith David H.
Airsensors Inc.
Ridout & Maybee Llp
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