Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1976-07-29
1977-12-13
Myhre, Charles J.
Internal-combustion engines
Cooling
Automatic coolant flow control
123 4149, 236 35, F01P 702
Patent
active
040623297
ABSTRACT:
A variable speed fan drive mechanism for an engine coolant system control by temperature and fan speed signals. The mechanism includes a hydrostatic pump-motor unit (hydrostatic transmission) powered by the engine, for transmitting power to the fan. Mechanical signals related to coolant temperature and fan speed are supplied to a comparator mechanism that delivers a mechanical output control signal. The output control signal is magnified and applied as a control force to vary the displacement of the pump in the hydrostatic unit. The comparator mechanism has the effect of negating engine speed as a control force. Thus, high engine speeds (that would tend to produce unduly large hydraulic flows through the pump-motor circuit) are reflected in high fan speed signals fed into the comparator mechanism, which produces a "corrected" output signal that appropriately reduces pump dislacement to thus reduce the fan speed to low energy consumption levels.
REFERENCES:
patent: 2594460 (1952-04-01), Lauck
patent: 3182912 (1965-05-01), Weisenbach
patent: 3359831 (1967-12-01), Scheiter
patent: 3483852 (1969-12-01), Newman et al.
patent: 3710765 (1973-01-01), Dorsch
patent: 3942486 (1976-03-01), Kirchner
Dolinar Andrew M.
Edelberg Nathan
McRae John E.
Myhre Charles J.
Taucher Peter A.
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