A cooling apparatus comprises a first cooling conduit branching off from a downstream side connection conduit to cool the cylinder head, a second cooling conduit branching off from the downstream side connection conduit, is provided in parallel with the first cooling conduit, an intermediate cooling
A cooling apparatus comprises a first cooling conduit branching off from a downstream side connection conduit to cool the cylinder head, a second cooling conduit branching off from the downstream side connection conduit, is provided in parallel with the first cooling conduit, an intermediate cooling conduit being connected to the first and second cooling conduits, is provided with an EGR cooler, a third cooling conduit running from a connection point of the intermediate cooling conduit and the first cooling conduit to an upstream side connection conduit, a fourth cooling conduit running from a connection point of the intermediate cooling conduit and the second cooling conduit to the upstream side connection conduit, and a changeover valve for adjusting the flow resistance of the second cooling conduit. And the direction of coolant flow in the intermediate cooling conduit is changed over by operating the changeover valve.
대표청구항▼
1. A cooling apparatus for an engine that comprises a cooling path through which coolant flows to circulate by a coolant pump for cooling an engine main body and a device to be cooled, the cooling path comprising a downstream side connection conduit that is connected to a downstream side of the cool
1. A cooling apparatus for an engine that comprises a cooling path through which coolant flows to circulate by a coolant pump for cooling an engine main body and a device to be cooled, the cooling path comprising a downstream side connection conduit that is connected to a downstream side of the coolant pump, an upstream side connection conduit that is connected to an upstream side of the coolant pump, a first cooling conduit that branches off from the downstream side connection conduit and cools at least one portion of the engine main body, a second cooling conduit that branches off from the downstream side connection conduit and is provided in parallel with the first cooling conduit, an intermediate cooling conduit that is connected to the first cooling conduit and to the second cooling conduit and is provided with the device to be cooled, a third cooling conduit that runs from a position of connection of the intermediate cooling conduit and the first cooling conduit to the upstream side connection conduit, and a fourth cooling conduit that runs from a position of connection of the intermediate cooling conduit and the second cooling conduit to the upstream side connection conduit,the cooling apparatus further comprising:a flow resistance regulation device provided in any one of the first cooling conduit, the second cooling conduit, the third cooling conduit, and the fourth cooling conduit,to regulate flow resistance, the flow resistance regulation device making, by a motion of the flow resistance regulation device, a change of direction in which coolant flows in the intermediate cooling conduit is changed over between a first direction from the first cooling conduit towards the second cooling conduit, and a second direction from the second cooling conduit towards the first cooling conduit, anda changeover valve as the flow resistance regulation device, andwherein the flow resistances of the first cooling conduit, the second cooling conduit, the third cooling conduit and the fourth cooling conduit are set so that coolant flows in the intermediate cooling conduit in the first direction when the changeover valve provided in the first cooling conduit or in the fourth cooling conduit is at a valve opening position. 2. A cooling apparatus for an engine that comprises a cooling path through which coolant flows to circulate by a coolant pump for cooling an engine main body and a device to be cooled, the cooling path comprising a downstream side connection conduit that is connected to a downstream side of the coolant pump, an upstream side connection conduit that is connected to an upstream side of the coolant pump, a first cooling conduit that branches off from the downstream side connection conduit and cools at least one portion of the engine main body, a second cooling conduit that branches off from the downstream side connection conduit and is provided in parallel with the first cooling conduit, an intermediate cooling conduit that is connected to the first cooling conduit and to the second cooling conduit and is provided with the device to be cooled, a third cooling conduit that runs from a position of connection of the intermediate cooling conduit and the first cooling conduit to the upstream side connection conduit, and a fourth cooling conduit that runs from a position of connection of the intermediate cooling conduit and the second cooling conduit to the upstream side connection conduit,the cooling apparatus further comprising:a flow resistance regulation device provided in any one of the first cooling conduit, the second cooling conduit, the third cooling conduit, and the fourth cooling conduit,to regulate flow resistance, the flow resistance regulation device making, by a motion of the flow resistance regulation device, a change of direction in which coolant flows in the intermediate cooling conduit is changed over between a first direction from the first cooling conduit towards the second cooling conduit, and a second direction from the second cooling conduit towards the first cooling conduit, anda changeover valve as the flow resistance regulation device, andwherein the flow resistances are set so that coolant flows in the intermediate cooling conduit in the second direction when the changeover valve provided in the second cooling conduit or in the third cooling conduit is at the valve opening position. 3. The cooling apparatus according to claim 1, further comprising an electronic control unit including a computer for implementing a computer program and configured to receive input from a plurality of sensors located on the engine, the electronic control unit programmed to: operate the flow resistance regulation device; anddetermine an anomaly of the flow resistance regulation device on the basis of correlation between operation to the flow resistance regulation device and change of temperature or of pressure within the intermediate cooling conduit. 4. The cooling apparatus according to claim 1, wherein the engine main body includes a cylinder head and a cylinder block,the device to be cooled is an EGR cooler, andthe first cooling conduit cools the cylinder head while the second cooling conduit cools the cylinder block. 5. The cooling apparatus according to claim 2, further comprising an electronic control unit including a computer for implementing a computer program and configured to receive input from a plurality of sensors located on the engine, the electronic control unit programmed to: operate the flow resistance regulation device; anddetermine an anomaly of the flow resistance regulation device on the basis of correlation between operation to the flow resistance regulation device and change of temperature or of pressure within the intermediate cooling conduit. 6. The cooling apparatus according to claim 2, wherein the engine main body includes a cylinder head and a cylinder block,the device to be cooled is an EGR cooler, andthe first cooling conduit cools the cylinder head while the second cooling conduit cools the cylinder block.
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이 특허에 인용된 특허 (5)
Cattani, Luis Carlos; Popadiuc, Peter; Melhem, Bashar Y.; Zielke, Martin R., Adaptive EGR cooling system.
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