Abstract: A system and a method are capable of cooling a high voltage battery capable of maintaining a heat generation level of the high voltage battery in an optimal state by controlling a cooling fan motor on the basis of information on ignition of a vehicle and information on an operation of an air conditioner, when an error is generated in controller area network (CAN) communication with a battery management system (BMS).

Abstract: A cooling system for a vehicle includes: an engine cooling circuit circulating a coolant to an engine mounted in the vehicle; an electronics cooling circuit circulating the coolant to an electrical equipment and a motor mounted in the vehicle; a reservoir tank connected to the engine and the motor and respectively compensating the coolant to the engine cooling circuit and the electronics cooling circuit; and a control valve connected to a first connection pipe connected to the reservoir tank and selectively connected to the engine cooling circuit and the electronics cooling circuit depending on a temperature change of the coolant during a cold driving mode or a warm driving mode of the vehicle to control a flow of the coolant.

Abstract: The invention relates to a cooling module (10) of a vehicle air conditioning system in particular for trucks, having a fan (12) which has an air inlet (14) and an air outlet (16) and generates an air flow in an air flow direction (18) from the air inlet (14) to the air outlet (16), a condenser (20) which can be flowed through bidirectionally for liquefying a refrigerant of the vehicle air conditioning system, which condenser (20) has an air flow cross section (A1) and is arranged so as to be adjacent to the air outlet (16) of the fan (12), wherein the air flow cross section (A1) has a first part cross section (22) and a second part cross section (24) which is different from the first part cross section (22), wherein the air outlet (16) of the fan (12) is assigned exclusively to the first part cross section (22) and loads the latter in the air flow direction (18) with the entire air flow of the fan (12), and wherein the second part cross section (24) can be flowed through during operation of the fan (12) selec

Abstract: A controller-implemented method for controlling a fan drive of a machine having a transmission is provided. The controller-implemented method may include generating a default fan speed for controlling the fan drive based on one or more operating conditions associated with the machine, generating an override fan speed based on one or more operating conditions associated with the transmission, and controlling the fan drive according to the override fan speed at least partially during calibration of the transmission.

Abstract: There is provided an exhaust heat recovery structure that may suppress boiling of coolant in a heat exchanger. The exhaust heat recovery structure includes a first pipe, a second pipe, a valve and a thermostat. Exhaust gas from an engine flows in the first pipe. The second pipe branches from the first pipe and a heat exchanger that exchanges heat between the coolant and exhaust gas is provided at the second pipe. The valve is provided at the first pipe or the second pipe. The valve adjusts a flow amount of exhaust gas flowing into the second pipe by opening and closing. The thermostat is equipped with a heat-sensing portion that is disposed inside the heat exchanger. When the temperature of the heat-sensing portion is high, the thermostat opens or closes the valve to reduce the flow amount of exhaust gas flowing into the second pipe.

Abstract: A vehicle including a cooling fan that is rotatably coupled to an electric motor that is electrically powered by a DC power source via an inverter is described. A method for controlling the cooling fan includes monitoring, via a first controller, a vehicle speed, and selecting a preferred operating state for the electric motor based upon the vehicle speed. The preferred operating state includes one of a first command associated with controlling the cooling fan to force air through the cooling system, a second command associated with a fan brake request, and a third command associated with an energy recovery mode. A discrete message from the first controller is communicated to an inverter controller, wherein the discrete message is based upon the preferred operating state for the electric motor. The inverter controller controls the inverter to control the electric motor in response to the discrete message.

Abstract: A coolant control system of a vehicle includes an adjusting module that: (i) receives an engine output coolant temperature measured at a coolant output of an internal combustion engine; (ii) adjusts the engine output coolant temperature based on a reference temperature to produce a first adjusted coolant temperature; (iii) receives an engine input coolant temperature measured at a coolant input of the internal combustion engine; and (iv) adjusts the engine input coolant temperature based on the reference temperature to produce a second adjusted coolant temperature. The coolant control system also includes a difference module that determines a difference between the first and second adjusted coolant temperatures. The coolant control system also includes a pump control module that controls a coolant output of a coolant pump based on the difference between the first and second adjusted coolant temperatures.

Abstract: A method for operating an engine compartment fan for an engine compartment of a motor vehicle, in which at least one component, in particular for the drive of the motor vehicle, is situated, including the following: ascertaining a present engine compartment temperature as a function of a thermal energy input into the engine compartment and a thermal energy discharge out of the engine compartment; and activating the engine compartment fan as a function of the ascertained present engine compartment temperature.

Abstract: A control method for a vehicle provided with a water-cooling intercooler apparatus, includes: detecting a coolant temperature of the water-cooling intercooler apparatus; detecting a rotation speed and a power consumption amount of an electric water pump (EWP) included in the water-cooling intercooler apparatus; calculating an efficiency value of the water-cooling intercooler apparatus based on the detected coolant temperature and air temperatures at an inlet and an outlet of an intercooler, respectively, included in the water-cooling intercooler apparatus; and determining whether the water-cooling intercooler apparatus is in a failure state based on the detected coolant temperature, the detected rotation speed and power consumption amount, and the calculated efficiency value.

Abstract: A thermal management system for an engine includes a radiator in fluid communication with the engine, a fan operable to provide air flow through the radiator, and a shutter assembly positioned on an opposite side of the radiator from the fan and being adjustable to control the air flow through the radiator. The radiator includes a first radiator section and a second radiator section, the first and second radiator sections each having a fore end and an aft end, respectively, wherein the first radiator section and the second radiator section converge at the respective fore ends and define an angle therebetween.

Abstract: A valve (10) for the temperature-dependent control of at least one hydraulic load includes a valve housing (12) with a tank connection (T), a working connection (A), and a supply connection (P). A control piston (30) controls the connections (A, P, T), is moveable in the valve housing (12) and is preloaded by a working spring (74). A thermal element (62) can be supplied with a fluid at a specifiable temperature (TFIuid) and is actively coupled to the control piston (30). The control piston can be moved by control pressure present at the supply connection (P). The thermal element (62) interacts with the working spring (74) such that the thermal element causes a temperature-dependent change of the preload force acting on the control piston (30).

Abstract: In an embodiment, a processor includes a fuzzy thermoelectric cooling (TEC) controller to: obtain a current TEC level associated with the processor; obtain a current fan power level associated with the processor; fuzzify the current TEC level to obtain a first fuzzy fan level; fuzzify the current fan power level to obtain a second fuzzy fan level; determine a new TEC power level based at least in part on the first fuzzy fan level, the second fuzzy fan level, and a plurality of fuzzy rules; and provide the new TEC power level to a TEC device associated with the processor, where the TEC device is to transfer heat from the processor to a heat sink. Other embodiments are described and claimed.

Abstract: A fan clutch assembly includes several features. A first feature relates to a lubrication passage that runs through the clutch package and has a return collection passage that extends through the operating piston. As a result, pitot tubes employed behind the piston may not be necessitated. Additionally, an anti-tamper device may be installed on the lead screw body to prevent adjustment of the fan hub and unintentional adjustment of the load carried on various bearings contained within the fan clutch assembly. Additionally, to position the speed sensor appropriately, a transfer shaft is provided that extends from the fan hub and/or lead screw back to the backside where a sensor is provided. This transfer shaft can be adjusted to precisely locate the sensor target relative to the sensor.

Abstract: An Emergency Portable Adjustable Engine-fan Assembly (fan clutch) Lock-in device, for emergency use, when engine-fan assembly (fan clutch) fails, and vehicle, large semi-truck trailer(s) combinations are forced to stop because engine oil and coolant immediately stop being properly cooled, and cannot move on own power until repaired; this device when installed allows vehicle to drive with own engine power to nearest safe-haven or repair facility.

Abstract: An air-cooled heat exchanger (ACHE) for cooling process fluids used in an industrial process. In one embodiment, the ACHE is configured as a forced-draft ACHE. A support structure supports the forced draft ACHE above grade. A tube bundle is supported by the structure and is configured to receive process fluids used in an industrial process. A plenum is connected to the support structure, positioned beneath the tube bundle and configured to direct air-flow through the tube bundle. A fan is supported by the support structure and positioned beneath the plenum. Rotation of the fan produces an air-flow that is directed through the tube bundle by the plenum. A fan drive system is supported by the support structure, positioned beneath the fan and comprises a permanent magnet motor comprising a motor casing, a stator and a rotatable shaft, the rotatable shaft being connected to the fan.

Abstract: A self-propelled construction device, in particular a soil compactor, includes a turbocharged diesel engine with a first radiator arrangement for cooling charge air and a second radiator arrangement for cooling a cooling liquid and/or hydraulic oil, with a first radiator fan being allocated to the first radiator arrangement and a second radiator fan being allocated to the second radiator arrangement and the first radiator fan and the second radiator fan being able to be operated essentially independently from each other.

Abstract: A method for controlling a fan. The method includes determining an actual air flow over an engine of a vehicle at a current time, and determining a necessary air flow over the engine for maintaining an appropriate engine coolant temperature. The actual air flow is associated with the vehicle traveling in a first direction. The method further includes estimating a future air flow over the engine that is associated with the vehicle travelling in a second direction. The method also includes controlling a fan operating characteristic based on the actual, necessary, and future air flows.

Abstract: A drive train cooling arrangement for motor vehicles has a first cooling circuit and a second cooling circuit and has a pump arrangement, by means of which coolant can be fed to the first and the second cooling circuit. The pump arrangement has a bidirectional pump, which has a first pump port and a second pump port and which can be driven by a pump electric motor. The first pump port is connected to the first cooling circuit, wherein the second pump port is connected to the second cooling circuit. A coolant volume flow which is provided for at least one of the first and the second cooling circuit can be adjusted by changing the rotational speed of the pump electric motor.

Abstract: An engine system having a coolant control valve may include a cylinder block configured with cylinders, a cylinder head sitting on top of the cylinder block and comprising exhaust ports and intake ports configured to lead to the cylinders, an Exhaust Gas Recirculation (EGR) cooler, a heater core, an oil cooler, or a radiator through which coolant circulates, and a coolant control valve configured to control a coolant supplied to the cylinder block, a coolant discharged from the cylinder block through the cylinder head, and a coolant supplied to the EGR cooler, the heater core, the oil cooler, or the radiator.

Abstract: A system and method of operating a cooling system for a vehicle engine, wherein one or more motors are operable to rotate one or more fans. Each of the one or more motors is controlled by a motor controller associated with the motor, in response to a control signal received from a system controller and an enable signal received from the vehicle. The motor controller operates the motor at a speed based upon the control signal if the control signal is received, and operates the motor at a predetermined speed if the control signal is not received but the enable signal is received.

Abstract: A method for operating a cooling fan of a vehicle including detecting at least one of a battery charge of a battery of the vehicle and a state of engagement of an air conditioning system of the vehicle and rotating the cooling fan in a direction to expel air from an engine compartment of the vehicle based on at least one of a detected battery charge of the battery or a detected state of engagement of the air conditioning system.

Abstract: There is provided a motor controller including: a voltage generator that generates a voltage applied to a motor; a temperature detector that detects a temperature of a circuit; a rotation speed detector that detects a rotation speed of the motor; and a voltage controller that controls the voltage generator so as to generate a voltage of a duty ratio based on a speed instruction value, and that, in cases in which a temperature of an element configuring the circuit, computed based on the temperature of the circuit detected by the temperature detector, the rotation speed of the motor detected by the rotation speed detector, and a load of the circuit, reaches a predetermined threshold value or above, controls the voltage generator so as to generate a voltage of a duty ratio that is lower than the duty ratio based on the speed instruction value.

Abstract: A hydraulic fan drive for a cooling system of an internal combustion engine, in particular a diesel engine of a mobile working machine or a construction machine, is configured to be switched off for a short time or by way of a transition in dependence on a load of the internal combustion engine. A shut-off valve, which is arranged in a working line connecting a variable-displacement pump to a fan motor, is configured to switch off the fan drive. The fan drive is further configured to be switched off by rotational speed monitoring of the internal combustion engine.

Abstract: A motorcycle includes a body frame, an engine supported by the body frame, a radiator disposed in front of the engine, a radiator fan disposed between the engine and the radiator, a left frame cover disposed above the radiator, and an intake air temperature sensor mounted to the left frame cover. The radiator fan rotates clockwise as viewed from the front of the vehicle, and the intake air temperature sensor is positioned above a right end of the radiator as viewed from the front of the vehicle.

Abstract: A variable channel type fan clutch apparatus may include a storage chamber and an operation chamber in which oil may be collected, wherein a fan clutch rotor may be interposed between the storage chamber and the operation chamber, an oil circulatory channel which fluid-connects the storage chamber and the operation chamber to circulate the oil therethrough, and a variable value which may be located in the oil circulatory channel, wherein the variable value may be configured to close the oil circulatory channel when an engine may be stopped or when a fan clutch exceeds an operation temperature, and wherein the variable value may be configured to open the oil circulatory channel when the engine may be operated or when the fan clutch does not exceed the operation temperature.

Abstract: The present invention describes a construction machine with a drive unit and with a cooling system that comprises a fan. The fan is connected to the drive unit by means of a controllable viscous coupling, whereby the viscous coupling can be adjusted in such a way that a required fan rotational speed is set on the output side. The invention furthermore describes a method for the automatic fan rotational speed regulation for a cooling system in a construction machine.

Abstract: This document discloses an adaptive fan control system for controlling a fan that cools an engine of a machine. Many machines carry out repetitive tasks or work cycles. The cooling requirements of the engine vary for each portion or segment of a work cycle. The disclosed system includes a controller with a memory having a plurality of stored work cycle patterns. Using a variety of sensors, the system and controller identifies the work cycle that the machine is carrying out and, using one of the stored work cycle patterns, the system anticipates the cooling requirements of the machine as the machine progresses through the work cycle and the system proactively changes the fan speed for upcoming segments of the work cycle.

Abstract: A method for operating a materials handling vehicle includes activating the materials handling vehicle and performing a warm up cycle. During the warm up cycle, energy is provided to at least one valve within the materials handling vehicle so as to energize the valve without providing a working fluid to the valve. Providing energy to the at least one valve effects a heating of oil located within the at least one valve.

Abstract: A diagnostic system for a vehicle includes a comparison module, a disabling module, and a fault indication module. The comparison module indicates whether a temperature of engine coolant is less than a first predetermined temperature. The disabling module disables the comparison module until the temperature of the engine coolant is greater than a second predetermined temperature. The fault indication module diagnoses a fault in response to the comparison module indicating that the temperature of the engine coolant is less than the first predetermined temperature.

Abstract: A system includes a sump, a pump having a steady-state speed, a fluid component that receives the fluid from the fluid pump, and a controller. The controller detects a soak condition of the system in which the pump load is low as fluid is moved into vacated fluid passages. The steady-state speed of the pump is temporarily increased by adding a calibrated overspeed value to the steady-state speed, for a calibrated duration. The controller reduces the pump speed to the steady-state speed after the calibrated duration has elapsed. A method includes detecting the soak condition and temporarily increasing the steady-state speed via the controller by adding the calibrated overspeed value to the steady-state speed, for a calibrated duration, when the soak condition is detected. A control system includes a processor and storage medium having instructions embodying the method, with detection of the soak condition provided via measurement of fluid temperature.

Abstract: An inline fan reverser (100) and related method for clearing away debris from a radiator (20) by programmatically reversing a vehicle's radiator fan (30). The fan reverser (100) electrically connects, inline, with the conductors that normally drive the electric motor (32) that turns the fan (31) in order to pull cooling air through the radiator (20) The fan reverser (100) includes a microcontroller that initially clears the radiator (20) of debris by pushing or blowing for a short period of time (e.g. 10 seconds) and then enters a main loop where the fan reverser repeatedly transitions between a cooling phase and a cleaning phase. In the cooling phase, the reverser pulls air through the radiator for a long period of time (e.g. 10 minutes). In the cleaning phase, the reverser periodically clears the radiator (20) of debris by pushing or blowing for a short period of time (e.g. 10 seconds). The reverser also provides for short OFF periods (e.g.

Abstract: A work vehicle is disclosed including at least one hydraulic actuator that receives hydraulic fluid, and a cooling system that promotes improved warm-up of the hydraulic fluid by directing air from an engine compartment across the hydraulic fluid in a reverse direction to warm the hydraulic fluid.

Abstract: A work vehicle is provided with an engine, a traveling device driven by driving force from the engine to cause the work vehicle to travel, a first hydraulic pump driven by the driving force from the engine to discharge hydraulic oil, and a cooling device having a cooling fan driven by the hydraulic oil supplied by the first hydraulic pump to cool the engine, and a control unit. The control unit performs a normal cooling control in which an upper limit fan speed is determined based on an engine speed, and a cooling suppression control in which the upper limit fan speed determined based on the engine speed is suppressed to be less than the upper limit fan speed during the normal cooling control when a predetermined operation required to increase the engine speed is performed.

Abstract: A thermal system includes fluid-cooled devices, a controller, and a thermal loop or loops each having a cooling actuator and fluid passages. The controller executes device-specific control logic to arbitrate between cooling requests having different relative priorities. The controller receives raw speed requests and noise, vibration, and harshness (NVH) limits for each device, and processes the raw speed requests and NVH limits to determine a relative cooling priority for each device. The controller outputs a speed command to the actuator(s) for each thermal loop in order to cool the devices at a level required by the device having the highest relative cooling priority. A vehicle includes a traction motor, a transmission that is selectively connected to the traction motor, fluid-cooled devices each in electrical communication with the motor, and a controller configured to execute the arbitration method noted above.

Abstract: A cooling system has an engine heat exchanger in thermal communication with engine oil in an engine. A transmission heat exchanger is in thermal communication with transmission oil in a transmission. A pump has a pump inlet and a pump outlet. A valve assembly is in fluid communication with the pump outlet and has a first and a second position that at least partially establish different coolant flow modes through a plurality of coolant flow passages. The valve assembly has a first inlet that receives coolant that flows from the pump outlet, to an engine inlet, then through the engine to an engine outlet. The valve assembly has a second inlet that receives coolant that flows from the pump outlet and bypasses the engine. The valve assembly has a single outlet that directs coolant flow to at least one of the engine heat exchanger and the transmission heat exchanger.

Abstract: A vehicle comprising a motor-driven air conditioning system comprising a power control device for controlling the temperature in a space inside the vehicle, and an internal combustion engine equipped with a motor management system that is arranged for determining the energy expended by the internal combustion engine, which internal combustion engine is at the same time used for driving the air conditioning system, characterized in that the motor management system is connected to said power control device and arranged for adjusting the power supplied to the air conditioning system in dependence on the load on the internal combustion engine.

Abstract: A method for determining ambient air temperature outside of a vehicle with a sensor mounted on the vehicle, includes the steps of determining a road speed of the vehicle, comparing the determined road speed to a reference road speed value, if the determined road speed is below the reference road speed value, activating a device to move ambient air across the sensor, the ambient air being drawn from a location outside the vehicle, taking a temperature reading with the sensor, and, if the temperature reading is lower than a stored temperature value, storing the lower temperature reading as the ambient air temperature.

Abstract: A cooling system of a vehicle may include a high and low temperature radiators that cool a high and low temperature coolants respectively circulating an engine and passing a water cooled intercooler and a low exhaust gas recirculation cooler of a turbo charger, a cooling fan that blows air to the high temperature radiator and the low temperature radiator, a high temperature coolant pump that pumps the high temperature coolant, a low temperature coolant pump that pumps the low temperature coolant, and a control portion that controls the high temperature coolant pump, the low temperature coolant pump, and the cooling fan according to driving conditions of the vehicle and environmental conditions. A controlling method may include detecting driving conditions of the vehicle and environmental conditions, setting an operating target for the cooling system and/or a lubrication system, and determining operating conditions for the cooling system and/or the lubrication system.

Abstract: A method for controlling a hybrid powertrain system including an internal combustion engine includes controlling operation of the hybrid powertrain system in response to a preferred minimum coolant temperature trajectory for the internal combustion engine.

Abstract: A cooling system for a combustion engine (1) includes a pilot line (12) which has an inlet (12a) to receive coolant from a line (3) of the cooling system and a thermostat (6) a sensing element (6b) for monitoring the temperature of the coolant in the pilot line (12) and a valve (6a). A thermal device (13, 26, 31) in contact with the coolant in the pilot line (12) at a location upstream of the sensing element (6b). A control unit (15) estimates when it is appropriate to alter the coolant's operating temperature in the cooling system and, at such times, activates the thermal device (13, 26, 31) so that it warms or cools the coolant in the pilot line (12).

Abstract: A fan drive system is provided having a housing connected with a pulley. A fan shaft is rotatably mounted to the housing by a clutch. A piston actuates the clutch. A pressure tube is provided for delivering pressure to the piston. A valve controls pressure against the piston. A fixed shaft rotatably supports the housing and the pulley and has passages extending through the pulley. A base connects the support shaft to a vehicle structure. An oil plate has inlets and outlets with the shaft passages. The oil plate circulates the hydraulic fluid. A coolant plate is juxtaposed between the oil plate and the structure supporting the support shaft. The coolant plate has inlets and outlets for coolant from a remote cooler.

Abstract: A fan cooling system and method are provided to control fan speed for cooling vehicle motor components while minimizing power consumption by the fan and reducing engine fuel consumption for an engine partially powering the fan. The fan cooling system raises engine coolant temperature of a vehicle in motion to derive a fan speed demand so that fan speed may be reduced. The fan cooling system selects a maximum fan speed demand from one or more fan speed demands to command fan speed based on various sensed inputs, including engine coolant temperatures. The fan cooling system also improves cooling efficiency by incorporating slipheat protection for the fan so as not to overdrive the fan for cooling.

Abstract: Methods and systems are provided for reducing corrosion of a charge air cooler and preventing engine misfire due to condensate formation. In response to condensate forming in a charge air cooler, engine cooling fan operation is adjusted. Engine cooling fan operation may also be controlled in response to vehicle operating conditions.

Abstract: The present invention includes an engine mechanically coupled to a generator to provide mechanical power thereto and a housing assembly defining an interior space to at least partially enclose the engine and the generator. The housing has a first airflow path structured to provide cooling into the radiator and a second airflow path structured to provide cooling to at least one of the engine and the generator. A temperature sensor can be disposed within the housing and a variable speed fan can be in flow communication with at least one of the first airflow path and the second airflow path. Further, a controller may be in communication with the variable speed fan and the temperature sensor.

Abstract: Various methods and systems are provided for adjusting the speed of a cooling system fan. In one example, a method includes adjusting a speed of a cooling system fan based on ambient temperature, engine output, and a desired engine temperature.

Abstract: The invention reduces waste of flow volume of pressurized oil discharged from a hydraulic pump when the rotational speed of a cooling fan is increased to the target rotational speed. The target rotational speed of the cooling fan is set at a target rotational speed setting portion. An acceleration pattern for increasing the cooling fan to the target rotational speed is set at an acceleration pattern setting portion based on the rotational speed of the cooling fan, the target rotational speed set at the target rotational speed setting portion, and magnitude of force due to inertia of the cooling fan and the hydraulic motor. The rotational speed command value calculation portion controls the pressurized oil to be supplied to the hydraulic motor at a flow rate required. Thus, it is possible to reduce wasted relief flow volume.

Abstract: A user interface method for a terminal for a vehicle is provided. The terminal obtains position information to detect a point of a road. A road image of a driving direction is obtained, a lanes of the road represented on the obtained road image is recognized, and a point of a road and lane in which the vehicle having the terminal arranged therein is detected. A virtual road image regarding the recognized lanes is generated, and the generated virtual lanes are added to the road image of the driving direction of the vehicle, and displayed. Traffic information for each lane and surrounding information (i.e. lane closure, construction, accident, etc.) at the detected point of the relevant road are obtained, and the obtained information is displayed for each virtual lane.

Abstract: A cooling apparatus for a water-cooled engine includes a radiator that cools coolant that has been circulated in the engine; a radiator fan that delivers air to the radiator; a determination portion that determines whether the engine is operated under a high load; and a setting portion. If the determination portion determines that the engine is operated under a high load, the setting portion sets an operation rate of the radiator fan at a time point at which the determination portion determines that the engine is operated under a high load, to a value higher than a normal operation rate at the same coolant temperature as a coolant temperature at the time point.

Abstract: A method for controlling at least one fan (13) for the regulation of the cooling demand of at least two cooling elements (12) included in a drill rig (1), the cooling demand of each one of the cooling elements (12) being determined, that the determined cooling demands are weighted together and that the fan (13) is controlled based on the weighting together. The method is characterized in that at least one of the cooling elements is equipped with a safety thermostat (21), which, if required, prevents overcooling that the fluid is not allowed to circulate in the cooling elements. The invention also relates to a drill rig for the execution of the above-mentioned method.

Abstract: An air-conditioner ECU sets the maximum flowrate or a set flowrate which is less than the maximum flowrate as a required flowrate Vr based on outside air temperature when a DEF mode is selected, and requires that coolant be circulated (steps 100 to 110). Also, when the coolant temperature Tw during heating is between a set temperature TS3 and a set temperature TS1, circulation of coolant at the minimum flowrate is required (steps 134, 130, 132). When a blower fan is stopped when the coolant temperature is equal to or less than the set temperature TS3 and a fresh air mode is selected, the circulation of coolant at the minimum flowrate is required when the vehicle speed Sv is above a set vehicle speed (steps 134 to 146). Cool air is prevented from being blown out of an air outlet and heating of the coolant is promoted by suppressing the speed of an electric pump while maintaining the ability to prevent fogging.