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US 10,851,701 B2Granted
Engine cooling system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNaoya Kawamoto, Rihito Kaneko, Hirokazu Ando, Yusuke Niwa
Life of this patent
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Abstract
An engine cooling system includes a coolant circulation path, which circulates coolant between the water jacket and the radiator of an internal combustion engine, a pump, a control valve, which is provided in the coolant circulation path, and a controller. The controller executes a warming-up promotion control and a pressure relaxation control. In the pressure relaxation control, the controller controls the aperture ratio of the radiator port such that the lower the temperature of the radiator, the lower becomes the engine rotational speed at which the aperture ratio of the radiator port is increased.
Claims8
An engine cooling system comprising:
- a coolant circulation path, which circulates coolant between a water jacket and a radiator of an internal combustion engine;
- a pump, which is provided in the coolant circulation path and operates in conjunction with rotation of an output shaft of the internal combustion engine;
- a control valve, which is provided in the coolant circulation path and has a housing having a radiator port connected to the radiator and a valve body accommodated in the housing, the control valve being configured such that an aperture ratio of the radiator port changes in a range from 0% to 100% by movement of the valve body inside the housing;
- and a controller configured to control the control valve, wherein the controller is configured to execute a warming-up promotion control for setting the aperture ratio of the radiator port to 0% when warming-up of the internal combustion engine is not completed, and a pressure relaxation control executed during the warming-up promotion control, the pressure relaxing control reducing pressure in the coolant circulation path by increasing the aperture ratio of the radiator port when the engine rotational speed is equal to or higher than a predetermined engine rotational speed even if warming-up of the internal combustion engine is not completed, as compared with a case where the engine rotational speed is less than the predetermined engine rotational speed, and the controller is configured to control the aperture ratio of the radiator port in the pressure relaxation control such that as the temperature of the radiator decreases, engine rotational speed at which the aperture ratio of the radiator port is increased also decreases.
1 more element
An engine cooling system comprising:
- a coolant circulation path, which circulates coolant between a water jacket and a radiator of an internal combustion engine;
- a pump, which is provided in the coolant circulation path and operates in conjunction with rotation of an output shaft of the internal combustion engine;
- a control valve, which is provided in the coolant circulation path and has a housing having a radiator port connected to the radiator and a valve body accommodated in the housing, the control valve being configured such that an aperture ratio of the radiator port changes in a range from 0% to 100% by movement of the valve body inside the housing;
- and
- a controller configured to control the control valve, wherein
- the controller is configured to execute
- a warming-up promotion control for setting the aperture ratio of the radiator port to 0% when warming-up of the internal combustion engine is not completed, and
- a pressure relaxation control executed during the warming-up promotion control, the pressure relaxing control reducing pressure in the coolant circulation path by increasing the aperture ratio of the radiator port when the engine rotational speed is equal to or higher than a predetermined engine rotational speed even if warming-up of the internal combustion engine is not completed, as compared with a case where the engine rotational speed is less than the predetermined engine rotational speed, and
- the controller is configured to control the aperture ratio of the radiator port in the pressure relaxation control such that when the temperature of the radiator is lower than a threshold value as compared with a case in which the temperature of the radiator is equal to or higher than the threshold value, the engine rotational speed at which the aperture ratio of the radiator port is increased becomes lower.
6 more elements
Dependencies are inferred from the claim text.