Cooling device for engine
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United States of America Patent
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Jun 19, 2012
Grant Date -
Oct 15, 2009
app pub date -
Feb 25, 2009
filing date -
Apr 11, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cooling device for an engine including a radiator circulation flow channel, a heater circulation flow channel, a bypass circulation flow channel, a valve, and a pump. The channels merge in the thermostat and form a common flow channel between the thermostat and the engine. The pump is provided in the common flow channel. At a start of a warm-up period and during the warm-up operation, circulation is substantially stopped by the thermostat, cooling water circulation is actuated in the bypass circulation flow channel, and an opening degree of the electronically controlled valve is gradually increased from a minimum as the cooling water temperature rises. The electronically controlled valve is not completely closed even when closed, and is open to a certain degree from an initial stage of the warm-up period, thereby causing part of the cooling water to flow in the bypass circulation flow channel.
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