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US 10,890,102 B2Granted
Cooling apparatus of internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshiharu Hirata, Yuji Miyoshi, Tomohiro Shinagawa, Hiroyuki Sugihara
Life of this patent
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Abstract
A cooling apparatus of an internal combustion engine according to the invention controls an activation of a flow rate changing valve such that a block water flow rate proportion when an engine output is relatively large in a range of the engine output equal to or larger than a predetermine engine output, is larger than the block water flow rate proportion when the engine output is relatively small in the range of the engine output equal to or larger than a predetermine engine output.
Claims9
A cooling apparatus of an internal combustion engine, comprising:
- a head water passage formed in a cylinder head of the internal combustion engine, through which cooling water for cooling the cylinder head flows;
- a block water passage formed in a cylinder block of the internal combustion engine, through which the cooling water for cooling the cylinder block flows;
- a pump for supplying the cooling water to the head and block water passages;
- a flow rate changing valve for changing a cylinder head water flow rate proportion and a cylinder block water flow rate proportion, the cylinder head water flow rate proportion being a proportion of a flow rate of the cooling water supplied to the head water passage relative to a total water flow rate which is a sum of the flow rate of the cooling water supplied to the head water passage and the flow rate of the cooling water supplied to the block water passage, and the cylinder block water flow rate proportion being a proportion of the flow rate of the cooling water supplied to the block water passage relative to the total water flow rate;
- and
- an electronic control unit for controlling an activation of the flow rate changing valve on the basis of an engine output corresponding to an output of the internal combustion engine,
- wherein the electronic control unit is configured to:
- control the activation of the flow rate changing valve such that the block water flow rate proportion is relatively larger when the engine output is relatively larger in a range of the engine output equal to or larger than a predetermined engine output, as compared to the block water flow rate proportion when the engine output is relatively smaller in the range of the engine output equal to or larger than the predetermined engine output, and
- control the activation of the flow rate changing valve such that the block water flow rate proportion is relatively smaller when the engine output is relatively larger in a range of the engine output smaller than the predetermined engine output, as compared to the block water flow rate proportion when the engine output is relatively smaller in the range of the engine output smaller than the predetermined engine output.
6 more elements
Dependencies are inferred from the claim text.