Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1992-01-13
1992-11-24
Kamen, Noah P.
Internal-combustion engines
Cooling
Automatic coolant flow control
165 39, F01P 702
Patent
active
051653770
ABSTRACT:
A system is provided for operating a fan to move air past a heat exchanger. The fan is driven by hydraulic fluid supplied from a pressure compensated pump. Such fluid driven fan systems are commonly utilized on industrial vehicles and on stationary engines having fluid type systems. The system controllably operates the fan at relatively high speed in response to the temperature of least one of the fluid coolant and hydraulic fluid being greater than respective first and second predetermined upper temperature values, and controllably operates the fan at a second relatively slow speed in response to the temperature of each of the fluid coolant and hydraulic fluid being less than respective first and second predetermined lower temperature values. The system also controllably continues to operate the fan at the instant fan speed in response to the temperature of at least one of the fluid coolant and hydraulic fluid being between the respective first and second predetermined upper and lower temperature values and to neither of the fluid coolant and hydraulic fluid temperatures being greater than the respective first and second predetermined upper temperature values.
REFERENCES:
patent: 3465538 (1969-09-01), Wunder
patent: 4066047 (1978-01-01), Vidakovic et al.
patent: 4223646 (1980-09-01), Kinder
patent: 4479532 (1984-10-01), Watanabe
patent: 4487255 (1984-12-01), Bianchetta et al.
patent: 4798177 (1989-01-01), Oomura et al.
patent: 4823744 (1989-04-01), Omura
Caterpillar Inc.
Kamen Noah P.
Yee James R.
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