Cooling device for internal combustion engine
First Claim
1. A cooling device for an internal combustion engine, the cooling device including a bypass passage that circulates cooling water for cooling the internal combustion engine to bypass a radiator, the cooling device comprising:
- an outflow temperature sensor that detects an outflow temperature of the cooling water flowing out from a cooling-water outlet of the internal combustion engine;
a flow control valve that adjusts a flow rate of the cooling water flowing in the bypass passage; and
a control device that controls the flow control valve to be open or closed, whereinthe control device, during a warming of the internal combustion engine, controls the flow control valve to be open or closed based on information about a change rate of the outflow temperature to prevent the change rate of the outflow temperature from decreasing to a minus value, after opening the flow control valve and starting a circulation of the cooling water in a route passing through the bypass passage,the control device opens the flow control valve to start the circulation of the cooling water in the route passing through the bypass passage when the outflow temperature becomes equal to or higher than a specified value during the warming of the internal combustion engine, andthe control device performs an open/close control routine to repeat;
closing the flow control valve when the information about the change rate of the outflow temperature becomes equal to or higher than a first threshold value; and
opening the flow control valve when the information about the change rate of the outflow temperature becomes equal to or lower than a second threshold value that is smaller than the first threshold value.
1 Assignment
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Accused Products
Abstract
A cooling device for an internal combustion engine has an outflow temperature sensor, a flow control valve, and a control device. The outflow temperature sensor detects an outflow temperature of the cooling water flowing out from a cooling-water outlet of the internal combustion engine. The flow control valve adjusts a flow rate of the cooling water flowing in a bypass passage. The control device controls the flow control valve to be open or closed. The control device, during a warming of the internal combustion engine, controls the flow control valve to be open or closed based on information about a change rate of the outflow temperature to prevent the change rate of the outflow temperature from decreasing to a minus value, after opening the flow control valve and starting a circulation of the cooling water in a route passing through the bypass passage.
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Citations
5 Claims
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1. A cooling device for an internal combustion engine, the cooling device including a bypass passage that circulates cooling water for cooling the internal combustion engine to bypass a radiator, the cooling device comprising:
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an outflow temperature sensor that detects an outflow temperature of the cooling water flowing out from a cooling-water outlet of the internal combustion engine; a flow control valve that adjusts a flow rate of the cooling water flowing in the bypass passage; and a control device that controls the flow control valve to be open or closed, wherein the control device, during a warming of the internal combustion engine, controls the flow control valve to be open or closed based on information about a change rate of the outflow temperature to prevent the change rate of the outflow temperature from decreasing to a minus value, after opening the flow control valve and starting a circulation of the cooling water in a route passing through the bypass passage, the control device opens the flow control valve to start the circulation of the cooling water in the route passing through the bypass passage when the outflow temperature becomes equal to or higher than a specified value during the warming of the internal combustion engine, and the control device performs an open/close control routine to repeat; closing the flow control valve when the information about the change rate of the outflow temperature becomes equal to or higher than a first threshold value; and opening the flow control valve when the information about the change rate of the outflow temperature becomes equal to or lower than a second threshold value that is smaller than the first threshold value. - View Dependent Claims (2, 3, 4, 5)
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Specification
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- Resources
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Current AssigneeDENSO Corporation
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Original AssigneeDENSO Corporation
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InventorsShikata, Yasuhiro
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Primary Examiner(s)Dallo, Joseph
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Assistant Examiner(s)Wang, Yi-Kai
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Application NumberUS15/117,307Publication NumberTime in Patent Office1,364 DaysField of Search123 411US Class CurrentCPC Class CodesF01P 2007/146 using valvesF01P 2025/32 Engine outcoming fluid temp...F01P 2037/02 startingF01P 7/16 by thermostatic controlF01P 7/165 characterised by systems wi...
