Abstract: An engine system is provided, including an engine, a circulation system that circulates coolant through a water jacket, and a controller. The circulation system includes a radiator passage including a heat exchanger, a bypass passage, a flow rate control device, and a thermally-actuated valve. The engine has a spark plug that forcibly ignites an air-fuel mixture. The engine switches between a first combustion in which the air-fuel mixture combusts without the forcible ignition, and a second combustion in which the air-fuel mixture combusts by the forcible ignition. The controller is electrically connected to the flow rate control device, and when the engine performs the first combustion, the controller controls the flow rate control device to adjust the flow rate of the coolant flowing through the water jacket according to the engine load, by closing the radiator passage and adjusting the flow rate of the coolant flowing through the bypass passage.

Abstract: An engine system is provided, including an engine having a water jacket, a circulation system that circulates coolant through the water jacket, and a controller. The circulation system includes a radiator passage including a heat exchanger, a bypass passage bypassing the heat exchanger, a flow rate control device, and a thermally-actuated valve connected to the radiator passage and that opens to allow the coolant to pass through the heat exchanger. When an engine load is below a first load, the controller controls the flow rate control device to adjust the coolant flow rate flowing through the water jacket according to the load, by closing the radiator passage and adjusting the coolant flow rate flowing through the bypass passage. When the load is above the first load, the controller controls the flow rate control device so that the coolant flows through each of the radiator passage and the bypass passage.

Abstract: An engine cooling system is provided, which includes a water jacket through which coolant flows, a heat exchanger that cools the coolant, a first bypass passage that bypasses the heat exchanger and recirculates the coolant to the water jacket, a radiator passage that recirculates the coolant to the water jacket via the heat exchanger, and a flow control device that is installed at a location where a coolant passage branches into the first bypass passage and the radiator passage and performs a water flow control to adjust a coolant amount flowing into the water jacket by adjusting a coolant amount flowing through the first bypass passage. A thermally-actuated valve connected with the radiator passage via a second bypass passage is provided to the first bypass passage, and when this valve opens, the coolant flowing through the first bypass passage flows into the radiator passage through the second bypass passage.

Abstract: An engine cooling system is provided, which includes a water jacket through which coolant flows, a heat exchanger that cools the coolant, a bypass passage that bypasses the heat exchanger and recirculates the coolant to the water jacket, a first radiator passage that recirculates the coolant to the water jacket via the heat exchanger, a flow control device installed at a location where a coolant passage branches into the bypass passage and the first radiator passage, a second radiator passage that bypasses the flow control device and is connected to the first radiator passage, and a thermally-actuated valve installed in the second radiator passage. The flow control device performs a water flow control to adjust a coolant amount flowing into the water jacket by adjusting a coolant amount flowing through the bypass passage. The coolant flows into the first radiator passage through the second radiator passage, when the valve opens.

Abstract: An engine cooling system is provided, which includes a water jacket through which coolant flows, a heat exchanger that cools the coolant, a first bypass passage that bypasses the heat exchanger and recirculates the coolant to the water jacket, a radiator passage that recirculates the coolant to the water jacket via the heat exchanger, and a flow control device that is installed at a location where a coolant passage branches into the first bypass passage and the radiator passage and performs a water flow control to adjust a coolant amount flowing into the water jacket by adjusting a coolant amount flowing through the first bypass passage. A thermally-actuated valve connected with the radiator passage via a second bypass passage is provided to the first bypass passage, and when this valve opens, the coolant flowing through the first bypass passage flows into the radiator passage through the second bypass passage.

Abstract: An engine system is provided, including an engine having a water jacket, a circulation system that circulates coolant through the water jacket, and a controller. The circulation system includes a radiator passage including a heat exchanger, a bypass passage bypassing the heat exchanger, a flow rate control device, and a thermally-actuated valve connected to the radiator passage and that opens to allow the coolant to pass through the heat exchanger. When an engine load is below a first load, the controller controls the flow rate control device to adjust the coolant flow rate flowing through the water jacket according to the load, by closing the radiator passage and adjusting the coolant flow rate flowing through the bypass passage. When the load is above the first load, the controller controls the flow rate control device so that the coolant flows through each of the radiator passage and the bypass passage.

Abstract: An engine cooling system is provided, which includes a water jacket through which coolant flows, a heat exchanger that cools the coolant, a bypass passage that bypasses the heat exchanger and recirculates the coolant to the water jacket, a first radiator passage that recirculates the coolant to the water jacket via the heat exchanger, a flow control device installed at a location where a coolant passage branches into the bypass passage and the first radiator passage, a second radiator passage that bypasses the flow control device and is connected to the first radiator passage, and a thermally-actuated valve installed in the second radiator passage. The flow control device performs a water flow control to adjust a coolant amount flowing into the water jacket by adjusting a coolant amount flowing through the bypass passage. The coolant flows into the first radiator passage through the second radiator passage, when the valve opens.

Abstract: An engine system is provided, including an engine, a circulation system that circulates coolant through a water jacket, and a controller. The circulation system includes a radiator passage including a heat exchanger, a bypass passage, a flow rate control device, and a thermally-actuated valve. The engine has a spark plug that forcibly ignites an air-fuel mixture. The engine switches between a first combustion in which the air-fuel mixture combusts without the forcible ignition, and a second combustion in which the air-fuel mixture combusts by the forcible ignition. The controller is electrically connected to the flow rate control device, and when the engine performs the first combustion, the controller controls the flow rate control device to adjust the flow rate of the coolant flowing through the water jacket according to the engine load, by closing the radiator passage and adjusting the flow rate of the coolant flowing through the bypass passage.

Abstract: A cooling structure of a multi-cylinder engine is provided. The engine has cylinders and a cylinder block formed with a cylinder bore wall. The cooling structure includes a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall, a water pump for feeding a coolant to the water jacket, an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing the coolant to the water jacket, and a spacer member accommodated inside the water jacket. The spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body. The dividing wall extends in a circumferential direction at a position opposing the introduction port.

Abstract: An air conditioner for a vehicle includes a casing, a cooling heat exchanger, a cooling temperature adjusting portion, a dew-point detector, a target temperature determining portion, and a cooling temperature control portion. The cooling heat exchanger is arranged in the casing to cool air to be blown into a vehicle compartment. The cooling temperature adjusting portion adjusts a cooling temperature of air cooled at the cooling heat exchanger such that the cooling temperature approaches a target cooling temperature of the cooling heat exchanger. The dew-point detector detects a dew-point temperature of air flowing to the cooling heat exchanger. The target temperature determining portion determines the target cooling temperature to be a first target temperature lower than the dew-point temperature by a standard degree, and temporarily to be a second target temperature lower than the first target temperature.

Abstract: A vehicle air conditioner includes a cooling heat exchanger arranged in a casing, a compressor control portion which controls a compressor such that a cooling temperature at the cooling heat exchanger approaches a target cooling temperature, and a dryness determination portion which determines whether an outer surface of the cooing heat exchanger is dry or not based on a humidity in the casing. A target temperature determination portion determines the target cooling temperature to be any one of target temperatures including a first target temperature that is lower than a dew-point temperature in the casing, when the dryness determination portion determines that the cooling heat exchanger is not dry. The target temperature determination portion determines the target cooling temperature to be any one of the target temperatures other than the first target temperature, when the dryness determination portion determines that the cooling heat exchanger is dry.

Abstract: A cooling structure of a multi-cylinder engine is provided. The engine has cylinders and a cylinder block formed with a cylinder bore wall. The cooling structure includes a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall, a water pump for feeding a coolant to the water jacket, an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing the coolant to the water jacket, and a spacer member accommodated inside the water jacket. The spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body. The dividing wall extends in a circumferential direction at a position opposing the introduction port.

Abstract: A cooling device of a multi-cylinder engine circulates a coolant from a water pump through water jackets of a cylinder head and a cylinder block. The cooling device includes a main jacket of the water jacket of the cylinder head, formed around combustion chambers, an exhaust jacket of the water jacket of the cylinder head, communicating to the main jacket and formed on an opposite side of exhaust ports to the combustion chambers, a circulation system for suppressing that the coolant flows through the main jacket in an engine cold start, by circulating the coolant through the water pump and the exhaust jacket, and a convection suppressor for suppressing that the coolant flows into the main jacket from the water jacket of the cylinder block in the engine cold start, by suppressing a convection of the coolant inside the water jacket of the cylinder block.

Abstract: When there is no occupant in seats other than a driver seat during a foot mode, an air-conditioning controller executes a single seat concentration mode to prevent blowing of warm air to a passenger seat and a backseat by closing foot outlets on a passenger seat side and a backseat side. In this case, in order to maintain an air volume blown from the foot outlet on a driver seat side when the controller changes the mode from the normal foot mode to the single seat concentration mode, the controller sets a blower level to be lower than in the case of the normal foot mode with respect to the same target blown air temperature.

Abstract: A vehicle air conditioner includes a cooling heat exchanger arranged in a casing, a compressor control portion which controls a compressor such that a cooling temperature at the cooling heat exchanger approaches a target cooling temperature, and a dryness determination portion which determines whether an outer surface of the cooing heat exchanger is dry or not based on a humidity in the casing. A target temperature determination portion determines the target cooling temperature to be any one of target temperatures including a first target temperature that is lower than a dew-point temperature in the casing, when the dryness determination portion determines that the cooling heat exchanger is not dry. The target temperature determination portion determines the target cooling temperature to be any one of the target temperatures other than the first target temperature, when the dryness determination portion determines that the cooling heat exchanger is dry.

Abstract: An air conditioner for a vehicle includes a casing, a cooling heat exchanger, a cooling temperature adjusting portion, a dew-point detector, a target temperature determining portion, and a cooling temperature control portion. The cooling heat exchanger is arranged in the casing to cool air to be blown into a vehicle compartment. The cooling temperature adjusting portion adjusts a cooling temperature of air cooled at the cooling heat exchanger such that the cooling temperature approaches a target cooling temperature of the cooling heat exchanger. The dew-point detector detects a dew-point temperature of air flowing to the cooling heat exchanger. The target temperature determining portion determines the target cooling temperature to be a first target temperature lower than the dew-point temperature by a standard degree, and temporarily to be a second target temperature lower than the first target temperature.

Abstract: A vehicle air conditioner includes a casing, an inside/outside air switching portion, a cooling heat exchanger, a dew-point detector, and a target temperature determining portion. The casing defines a passage through which air to be blown into a vehicle compartment passes. The inside/outside air switching portion switches between inside air and outside air modes. The cooling heat exchanger is arranged in the casing to cool air. The dew-point detector detects a dew-point temperature of air flowing to the cooling heat exchanger. The target temperature determining portion determines a target cooling temperature of the cooling heat exchanger to be lower than the dew-point temperature before a base time elapses, and maintains the target cooling temperature at a target cooling temperature that is set at the elapse of the base time after the base time elapses, in the inside air mode.

Abstract: An air conditioner includes a cooling heat exchanger configured to cool air, and a wet-state detection sensor attached to an air outlet surface of the cooling heat exchanger to detect a wet state of the air outlet surface due to condensation water. The air outlet surface of the cooling heat exchanger is tilted by an angle with respect to a horizontal direction or is perpendicular to the horizontal direction, and the wet-state detection sensor is arranged at a position in an upper half area of the air outlet surface in a direction perpendicular to the horizontal direction. Alternatively, the wet-state detection sensor is arranged at a position of the air outlet surface in a high-temperature area in which the temperature is higher than an average temperature of the air outlet surface. In this case, the high-temperature area may be positioned within the upper half area of the air outlet surface.

Abstract: When there is no occupant in seats other than a driver seat during a foot mode, an air-conditioning controller executes a single seat concentration mode to prevent blowing of warm air to a passenger seat and a backseat by closing foot outlets on a passenger seat side and a backseat side. In this case, in order to maintain an air volume blown from the foot outlet on a driver seat side when the controller changes the mode from the normal foot mode to the single seat concentration mode, the controller sets a blower level to be lower than in the case of the normal foot mode with respect to the same target blown air temperature. Thus, an electric power consumed by an electric motor of a blower can be reduced, thereby realizing energy saving.

Abstract: An air-conditioning device for a vehicle includes a blower and an estimating portion. The blower is disposed in an air-conditioning case, and performs a dry control for a heat exchanger arranged in a passenger compartment of the vehicle by sending air. The blower uses one of power supplied from an external power source, power supplied from the battery having residual quantity equal to or larger than a predetermined quantity, or power supplied from an in-vehicle solar cell, while the vehicle is parked. The estimating portion estimates an approximate elimination of odor generated from the heat exchanger by starting the sending of air, and stops the blower based on the estimation.