Internal-combustion engines – Cooling – Automatic coolant flow control
Reexamination Certificate
2007-09-11
2007-09-11
Cronin, Stephen K. (Department: 3747)
Internal-combustion engines
Cooling
Automatic coolant flow control
C123S041440, C123S041330, C123S041290
Reexamination Certificate
active
11334045
ABSTRACT:
In a cooling and heating device for an internal combustion engine having a main coolant pump supplying coolant to the engine and a coolant return line with a return flow control unit which directs the coolant return flow to the main coolant pump selectively via a large cooling circuit, in which an air/fluid cooler is arranged, or via a small cooling circuit bypassing the air/fluid cooler, an oil/coolant heat exchanger is provided for heating or cooling a flow of oil, the flow of coolant through the oil/coolant heat exchanger being controlled by means of a coolant flow control unit directing the flow through the oil/coolant heat exchanger only after a predefined coolant temperature has been reached so that, below this temperature, no heat is extracted from the coolant by the oil/coolant heat exchanger and rapid heating of the internal combustion engine is ensured.
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Lütze Roland
Sass Heiko
Bach Klaus J.
Daimler-Chrysler AG
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