Internal-combustion engines – Charge forming device – Heating of combustible mixture
Patent
1993-06-15
1995-05-02
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Heating of combustible mixture
F02M 3100
Patent
active
054110050
ABSTRACT:
A fuel heating system which employs an improved heat exchanger for reducing particulate emissions in diesel or kerosene fuel powered internal combustion engines. The fuel heating system encompasses an internal combustion engine having a fuel line, a cooling system having a coolant line, and the novel heat exchanger of this invention. The heat exchanger has a container for holding heated coolant to provide a heat source for the fuel. A helical fuel tube extends the length of the container, with its inlet and outlet ports located in close proximity at the same end of the container. The coolant inlet and outlet ports are located on opposite ends of the container, with the coolant inlet port located on the same end of the container as the fuel ports. The coolant outlet port is located at a higher elevation than the coolant inlet port to prevent air lock. The coolant ports are connected into the coolant system of the internal combustion engine, while the fuel ports are connected into the fuel line ultimately leading to the fuel injectors. The fuel reaches a maximum temperature of about 85.degree. F. which allows a reduction of particulate emissions of up to about 78%. An optional electric resistance heater may be used to heat fuel for starting a cold engine.
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Bohl Michael E.
Glass Robert A.
Cross E. Rollins
Macy M.
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