Integrated heat management system of vehicle
An integrated heat management system for a vehicle includes an air conditioner configured to cool or heat a passenger compartment using a refrigerant, a water-cooled cooling device configured to cool a specific device using the refrigerant of the air conditioner, and an air conditioning load change preventing unit configured to prevent a sudden change in an air conditioning load of the air conditioner when turning on or off the water-cooled cooling device with respect to the air conditioner.
1. An integrated heat management system for a vehicle, comprising:
an air conditioner configured to cool or heat a passenger compartment using a refrigerant;
a water-cooled cooling device configured to cool a specific device using the refrigerant of the air conditioner; and
an air conditioning load change preventing unit configured to prevent a sudden change in an air conditioning load of the air conditioner when turning on or off the water-cooled cooling device with respect to the air conditioner,
wherein the air conditioner includes a first refrigerant line configured to cool or heat the passenger compartment, a second refrigerant line configured to divert a part of the refrigerant in the first refrigerant line, an expansion valve installed in the second refrigerant line, a refrigerant-cooling water heat exchanger installed in the second refrigerant line, a cooling water circulation line configured to transfer cold energy of the refrigerant to a the specific device using the refrigerant-cooling water heat exchanger and a water pump configured to circulate cooling water through the cooling water circulation line,
wherein the air conditioning load change preventing unit includes a control unit configured to differently control operation timings of the expansion valve and the water pump when the water-cooled cooling device is turned on or off with respect to the air conditioner,
wherein the water-cooled cooling device is a water-cooled battery cooling device configured to cool a battery,
wherein the expansion valve is a battery cooling expansion valve having a shut-off function, and the control unit is configured to differently control the operation timings of the expansion valve and the water pump according to a temperature of the battery and a temperature of the cooling water in the cooling water circulation line when the water-cooled battery cooling device is turned on or off with respect to the air conditioner, and
wherein when the air conditioner is operating in the air conditioner mode and the water-cooled battery cooling device is in operation, the control unit comes into a primary release mode to turn off the water pump if the temperature of the battery is equal to or lower than a third battery reference temperature which is lower than a first battery reference temperature or if the temperature of the cooling water in the cooling water circulation line is equal to or lower than a second cooling water reference temperature which is lower than the first cooling water reference temperature, and then comes into a secondary release mode to reduce the rotation speed of the compressor of the air conditioner and to close the battery cooling expansion valve to stop cooling of the battery if a predetermined time is elapsed after entry into the primary release mode.
2. The system of claim 1 , wherein the control unit executes control such that, when coming into the secondary release mode, an operation of reducing the rotation speed of the compressor of the air conditioner and an operation of closing the battery cooling expansion valve are sequentially performed with a predetermined time lag between.
3. An integrated heat management system for a vehicle, comprising:
an air conditioner configured to cool or heat a passenger compartment using a refrigerant;
a water-cooled cooling device configured to cool a specific device using the refrigerant of the air conditioner; and
an air conditioning load change preventing unit configured to prevent a sudden change in an air conditioning load of the air conditioner when turning on or off the water-cooled cooling device with respect to the air conditioner,
wherein the air conditioner includes a first refrigerant line configured to cool or heat the passenger compartment, a second refrigerant line configured to divert a part of the refrigerant in the first refrigerant line, an expansion valve installed in the second refrigerant line, a refrigerant-cooling water heat exchanger installed in the second refrigerant line, a cooling water circulation line configured to transfer cold energy of the refrigerant to a the specific device using the refrigerant-cooling water heat exchanger and a water pump configured to circulate cooling water through the cooling water circulation line,
wherein the air conditioning load change preventing unit includes a control unit configured to differently control operation timings of the expansion valve and the water pump when the water-cooled cooling device is turned on or off with respect to the air conditioner,
and wherein the water-cooled cooling device is a water-cooled battery cooling device configured to cool a battery,
wherein the expansion valve is a battery cooling expansion valve having a shut-off function, and the control unit is configured to differently control the operation timings of the expansion valve and the water pump according to a temperature of the battery and a temperature of the cooling water in the cooling water circulation line when the water-cooled battery cooling device is turned on or off with respect to the air conditioner,
wherein a first battery reference temperature is predetermined,
wherein a second battery reference temperature is determined,
wherein a first cooling water reference temperature is determined, and
wherein when the air conditioner is operating in an air conditioner mode regardless of cooling of the passenger compartment and the water-cooled battery cooling device is in operation, the control unit comes into the primary release mode to turn off the water pump if the temperature of the battery is equal to or lower than a third battery reference temperature or if the temperature of the cooling water in the cooling water circulation line is equal to or lower than a second cooling water reference temperature, and then comes into the secondary release mode to turn off the compressor of the air conditioner and to close the battery cooling expansion valve to stop cooling of the battery if a predetermined time is elapsed after entry into the primary release mode.
4. The system of claim 3 , wherein the control unit executes control such that, when coming into the secondary release mode, an operation of turning off the compressor of the air conditioner and an operation of closing the battery cooling expansion valve are sequentially performed with a predetermined time lag between.