Valve control device

A valve control device comprising:

• a valve unit disposed in a cooling water circuit to increase or decrease a flow rate of cooling water to an internal-combustion engine and to start or stop circulation of cooling water to a radiator and a heater core, wherein
• the valve unit having
• a valve object and
• a housing that houses the valve object,
• the housing has
• a heater passage to communicate with the heater core,
• a bypass passage to communicate with a channel bypassing the heater core and the radiator, and
• a radiator passage to communicate with the radiator,
• the valve object is configured to rotate to start or stop circulation of the cooling water to the heater passage, the bypass passage and the radiator passage,
• when an open degree of the heater passage is in a fully opened position, the valve object is configured to change an open degree of the bypass passage and an open degree of the radiator passage to be in inverse proportion in a state while the heater passage is maintained in the fully opened position by the valve object.

A valve control device for a cooling water circuit through which cooling water of an internal-combustion engine circulates to a radiator, and a heater core, the valve control device comprising:

• a valve unit disposed in the cooling water circuit to increase or decrease a flow rate of cooling water to the internal-combustion engine and to start or stop circulation of cooling water to the radiator and the heater core;
• and
• a control part which controls operation of the valve unit, wherein
• the valve unit has
• a valve object, and
• a housing that houses the valve object,
• the housing has
• a first passage defined in the housing to communicate with a first channel connected to the heater core, and a first opening defined at an inner circumference side of the first passage,
• a second passage defined in the housing to communicate with a second channel bypassing the heater core and the radiator, and a second opening defined at an inner circumference side of the second passage, and
• a third passage defined in the housing to communicate with a third channel connected to the radiator, and a third opening defined at an inner circumference side of the third passage,
• the valve object has a plurality of valve holes passing through in a radial direction, and is configured to rotate to start or stop circulation of the cooling water to the first passage, the second passage or the third passage, and
• when the first opening and one of the valve holes fully overlap with each other so that the first opening is in a fully opened position, rotation of the valve object provides a configuration such that when one of an overlap ratio between the second opening and another one of the valve holes and an overlap ratio between the third opening and another one of the valve holes increases, the other of the overlap ratio between the second opening and another one of the valve holes and the overlap ratio between the third opening and another one of the valve holes decreases while the first opening is maintained in the fully opened position.

A valve control device comprising:

• a valve unit disposed in a cooling water circuit to increase or decrease a flow rate of cooling water to an internal-combustion engine and to start or stop circulation of cooling water to a radiator and a heater core, wherein
• the valve unit having
• a valve object and
• a housing that houses the valve object,
• the housing has
• a heater passage to communicate with the heater core,
• a bypass passage to communicate with a channel bypassing the heater core and the radiator, and
• a radiator passage to communicate with the radiator,
• the valve object is configured to rotate to start or stop circulation of the cooling water to the heater passage, the bypass passage and the radiator passage,
• when an opening degree of the heater passage is in a fully opened position, the valve object is configured to change an opening degree of the bypass passage and an opening degree of the radiator passage such that when one of the opening degree of the bypass passage and the opening degree of the radiator passage increases, the other of the opening degree of the bypass passage and the opening degree of the radiator passage decreases in a state while the heater passage is maintained in the fully opened position.