Altitude compensated vacuum regulating valve

Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type

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123117A, 137109, 251 614, G05D 700

Patent

active

039331660

ABSTRACT:
An altitude compensated vacuum control system for regulating the vacuum servo mechanism of an internal combustion engine of the type having a distributor with a vacuum servo controlled advance mechanism incorporating a positive stop for maximum spark advance, a carburetor to provide a source of vacuum to operate said vacuum servo mechanism and a vacuum control valve assembly for regulating the vacuum servo mechanism of said distributor. The vacuum control valve assembly receives a spark port vacuum signal from the carburetor to maintain a predetermined vacuum spark advance as the engine begins to accelerate. Upon attaining the predetermined vacuum spark advance and at a given speed, the control assembly becomes operative to sum the initial first predetermined level vacuum signal to a secondary altitude compensated vacuum source signal, which is a function of an engine operating parameter, thereby causing the vacuum servo spark advance mechanism in the distributor to obtain a maximum spark advance by moving to a positive stop within the distributor. This full vacuum advance is maintained independent of the degradation of the vacuum signals as a result of changes in altitude, provided the spark port signal is greater than the full vacuum spark advance signal.

REFERENCES:
patent: 3157168 (1964-11-01), Sterner et al.
patent: 3491735 (1970-01-01), Walker
patent: 3698366 (1972-10-01), Gropp
patent: 3780713 (1973-12-01), Julian

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