Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-03-12
1992-09-29
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
73116, 123494, F02P 515, F02D 4106
Patent
active
051506831
ABSTRACT:
A method and apparatus for determining the percentage of two different fluids having substantially different dielectric properties such as a gasoline/alcohol or a water/oil mixture. An inductive coil element immersed in the mixture exhibits a distributed capacitance level which is directly proportional to the dielectric constant of the fluid mixture surrounding the coil which, in turn, is directly proportional to the percentage of each fluid in the mixture. The loops of wire in the coil act as equivalent electrodes in creating a capacitance between each loop. The dielectric constant of a mixture will increase with the percentage of the higher dielectric fluid thus increasing the capacitance. An amplifier is constructed that oscillates at the resonant frequency of the LC circuit formed by the coil in the mixture. The resonant frequency decreases as capacitance increases. The subject invention includes a circuit which converts a frequency signal generated by energization of the coil to a voltage signal which, in turn, is sent to an engine controller. The output signal is used by the engine controller to selectively adjust the fuel ratio and the spark timing of the engine in accordance with the percentage of alcohol in the fuel mixture.
REFERENCES:
patent: 2772393 (1956-11-01), Davis
patent: 4187462 (1980-02-01), Haker et al.
patent: 4703732 (1987-11-01), Wireland et al.
patent: 4905655 (1990-03-01), Maekawa
patent: 4915084 (1990-04-01), Gonze
Depa Henry F.
Kopera John J. C.
Argenbright Tony M.
Chrysler Corporation
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