US20120074236A1 - Control method of air conditioner in electrical vehicle - Google Patents
Control method of air conditioner in electrical vehicle Download PDFInfo
- Publication number
- US20120074236A1 US20120074236A1 US13/310,324 US201113310324A US2012074236A1 US 20120074236 A1 US20120074236 A1 US 20120074236A1 US 201113310324 A US201113310324 A US 201113310324A US 2012074236 A1 US2012074236 A1 US 2012074236A1
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- Prior art keywords
- heater
- temperature
- discharge temperature
- air
- conditioning system
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters
- B60H2001/2231—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters for proper or safe operation of the heater
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters
- B60H2001/224—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters automatic operation, e.g. control circuits or methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2246—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor
- B60H2001/225—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor related to an operational state of another HVAC device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2246—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor
- B60H2001/2256—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor related to the operation of the heater itself, e.g. flame detection or overheating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2259—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal
- B60H2001/2262—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal related to the period of on/off time of the heater
Definitions
- the present invention relates to a control method of an air conditioner, and more particularly, to a control method for an air conditioning system of an electric vehicle which prevents power from being consumed by a heater in the air conditioning system.
- the internal cabin temperature of the vehicles is controlled by a separate electric heater and an air-conditioning system.
- power that is consumed by the air-conditioning system of an electric-vehicle is greater than that of engine-driven vehicles because the air-conditioning system in electric vehicles requires power consumption for separately driving the electric heater and the air-conditioning system even when it is hot in summer in order to control the internal temperature of the vehicles.
- the air-conditioning systems in electric vehicles can and do greatly effect the driving range of the electric vehicles.
- the range can be increased by limiting the usage of the air-conditioning system by the user, this comes a cost to the occupant who might find themselves very uncomfortable especially on hot summer days.
- the present invention has been made in an effort to provide a control method of an air conditioner that can prevent power from being consumed by driving a heater in an air conditioner by determining whether one or more heater cut-off conditions are satisfied from a desired discharge temperature, a desired evaporator temperature, an evaporator temperature, and a heater discharge temperature, and then cutting off the heater in response to a determination that one or more of these conditions are satisfied.
- the present invention has been made in an effort to provide a control method of an air conditioner that can reduce power consumption by an air-conditioning system in the electric vehicle which is generated when a heater and an air conditioner are simultaneously operating by delaying operation of the heater when the air conditioner is in operation.
- An exemplary embodiment of the present invention provides a control method of an air conditioner, including determining, by a controller, whether either a desired discharge temperature from an air-conditioning system to maintain the internal cabin temperature of a vehicle at a desired internal temperature and a desired evaporator temperature that is an evaporator temperature satisfies a heater operating condition; controlling, by the controller, operation of the heater in accordance with temperature and traveling conditions of the vehicle to output the desired discharge temperature when the heater operating condition is satisfied; and cutting off operation of the heater when a measured heater discharge temperature of the heater is measured to be equal to or greater than a reference temperature or the heater discharge temperature is greater than the desired discharge temperature by a predetermined temperature or more when the heater is operated.
- the control method may further include re-determining whether at least the desired discharge temperature and the desired evaporator temperature satisfy the heater driving condition after the heater operation is cut off; and in response initiating operation of the heater when the heater operation condition is satisfied and the desired discharge temperature is a first temperature or less and the heater discharge temperature is a first predetermined amount T 1 , e.g., 15° C., lower than the desired discharge temperature.
- the heater when the heater operation condition is satisfied and the desired discharge temperature is above the first temperature, the heater may again be operated when the heater discharge temperature is lower than a second temperature. Additionally, when the desired evaporator temperature is a second predetermined amount T 2 , e.g., 2° C., higher than the current measured evaporator temperature or the desired discharge temperature is a third predetermined amount T 3 , e.g., 4° C. higher than the desired evaporator temperature, the heater driving condition may be determined to be satisfied.
- T 2 e.g., 2° C.
- the control method may further include an air-conditioning system driving determining and delaying step that keeps the heater “maxed out” for a predetermined time such that operation of the heater is performed after a predetermined time is passed when the air-conditioning system is being operated, as a result of determining whether the air-conditioning system is being operated after determining that a heater operating condition has been satisfied. Additionally, when it is determined that the air-conditioning system is not being operated the heater may then be controlled to operate in accordance with temperature and traveling conditions of the vehicle to output the desired discharge temperature when the heater operating condition is satisfied.
- the heater operation may be cut off when the heater discharge temperature is a predetermined temperature T 4 , e.g., 85° C., or more, which is a reference temperature, or the heater discharge temperature is larger than the desired discharge temperature by a predetermined temperature, T 5 , 20° C., or more, which is a predetermined temperature for cutting off power to the heater.
- a predetermined temperature T 4 e.g. 85° C., or more, which is a reference temperature
- the control method of an air conditioner prevents power from being consumed by operation of a heater in an air conditioning system of an electric vehicle by determining whether one or more heater cut-off conditions are satisfied based a desired discharge temperature, a desired evaporator temperature, an evaporator temperature, and/or a heater discharge temperature, and then cutting off the heater in response to this determination.
- the exemplary embodiments of the present invention can reduce the amount of power consumed by an air-conditioning system that is generated when a heater and an air conditioner are simultaneously operated by delaying operation of the heater while the air conditioner is in operation.
- FIG. 1A and FIG. 1B are flowcharts illustrating a control method of an air conditioner according to an exemplary embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of an air-conditioning system for illustrating the control method of an air conditioner shown in FIG. 1A and FIG. 1B .
- vehicle or “vehicular” or other similar term as used herein is inclusive of all electrically operated vehicles including fuel cell and hybrid vehicles and any configuration thereof in general, such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like. Further, this invention can also be modified to operate in fuel-computation vehicles as well. However, the examples below will be described with reference to an electric vehicle utilizing a battery as its main source of power.
- SUV sports utility vehicles
- an air-conditioning controller 110 is installed and configured to calculate a desired discharge temperature, T o , for discharged air from an air conditioning system 100 and a desired evaporator temperature, T eo , of a evaporator in air-conditioner (air con) 130 , in order for a driver to maintain a desired internal temperature within the cabin of the vehicle.
- Air-conditioning controller 110 performs a driving condition determining step S 1 that determines whether either the desired discharge temperature T o or the desired evaporator temperature T eo , which were previously calculated by the air-conditioning controller 110 , satisfy an operation condition for operating a heater within the air conditioning system 100 .
- the air-conditioning controller 100 in the exemplary embodiment may be a controller of an FATC (Full Automatic Temperature Control) that controls operation of electronic devices such as a heater 120 and the air-con 130 , which are each separate devices in the air conditioning system 100 , in accordance with the state and temperature of the vehicle which are supplied from various sensors (not shown) in the vehicle.
- FATC Full Automatic Temperature Control
- the air-conditioning controller 110 may determine that a heater driving condition has been satisfied, when, for example, the desired evaporator temperature T eo is T 2 degrees, e.g., 2° C., higher than the evaporator temperature T e measured from the evaporator in the air-con 130 or the desired discharge temperature T o is T 3 , e.g., 4° C., higher than the desired evaporator temperature T eo .
- the air-conditioning controller 110 may determine whether the desired evaporator temperature T eo is larger than a first value obtained by adding T 2 , e.g., 2° C., to the evaporator temperature T e (S 11 ) and determine that the heater driving condition is satisfied when the desired evaporator temperature T eo is larger than the first value obtained by adding T 2 , e.g., 2° C. to the evaporator temperature T e .
- the air-conditioning controller 110 may determine whether the desired discharge temperature T o is larger than a second value obtained by adding T 3 , e.g., 4° C., to the desired evaporator temperature T eo , when the desired evaporator temperature T eo is equal to or smaller than the first value obtained by adding T 2 to the evaporator temperature T e (S 12 ). If T o is not larger than a second value obtained by adding T 3 , e.g., 4° C., to the desired evaporator temperature T eo , the controller repeats steps (S 11 ) and (S 12 ) until one of the defined conditions are satisfied.
- a second value obtained by adding T 3 e.g., 4° C.
- the air-conditioning controller 110 determines that the heater operation condition has been satisfied when the desired discharge temperature T o is larger than the value obtained by adding, T 2 , e.g., 4° C., to the desired evaporator temperature T eo .
- heater 120 is kept turned off (S 5 ) and the controller repeats steps (S 11 ) or (S 61 ) and (S 12 ) or (S 62 ) until one of the heater operation conditions are satisfied.
- the controller may, in some embodiments like the one shown in FIG. 1A , additionally determine whether air-con 130 is currently being operated (S 21 ) and an air-con driving determining and delaying step (S 2 ) that keeps heater 120 stopped for a predetermined time in accordance with whether air-con 130 is driven is performed.
- a heater operation control step (S 3 ) that controls the operation of heater 120 in accordance with the temperature and traveling conditions of the vehicle is performed to output the desired discharge temperature T o .
- the air-conditioning controller 110 drives a timer t.
- the air-conditioning controller 110 determines whether a certain operational time has passed a predetermined time t o from timer t (S 23 ), and when the predetermined time t o of timer t has passed, a heater operating control step (S 3 ) that controls operation of heater 120 is performed by the controller 110 .
- the predetermined time t o may be set at 1 minute, for example.
- the heater driving control step (S 3 ) that controls driving of heater 120 may be performed after heater 120 is kept stopped for the predetermined time t o in which the temperature of the evaporator is led to be decreased by, e.g., reducing the operational RPM of a compressor of air-con 130 .
- the air-conditioning controller 110 controls the operation of heater 120 which may be embodied as a Positive Thermal Coefficient (PTC) heater so that the temperature of air supplied from air conditioning system 100 into the vehicle is controlled to become the desired discharge temperature To in accordance with the temperature of the internal/external air and conditions of the vehicle.
- the air-conditioning controller 100 controls the temperature of the air discharged from heater 120 by controlling a operation signal supplied to heater 120 in a PWM (Pulse Width Modulation) type arrangement in order to control the discharge temperature of air conditioning system 100 to the desired discharge temperature T o .
- PWM Pulse Width Modulation
- a heater cut-off determining step (S 4 ) is performed. This step (S 4 ), cuts off driving of heater 120 when the heater discharge temperature T p , which is continually increased by driven heater 120 , is greater than or equal to a reference temperature T 4 or when the heater discharge temperature Tp is greater than or equal at a predetermined temperature T 5 plus a desired discharge temperature T o .
- the air-conditioning controller 110 may determine whether the heater discharge temperature Tp is 85° C. or more, which is the reference temperature T 4 , in the heater cut-off determining step (S 41 ), and when it is determined that the heater discharge temperature Tp is T 4 or more, the heater is turned off (S 5 ) by turning off the heater (S 43 ) to prevent heater 120 from becoming overheated.
- the reference temperature T 4 may be set at different values in accordance with the driving characteristics of the air-conditioning system of vehicles and the environment in which the vehicle is currently or has previously been driving in.
- the air-conditioning controller 110 determines whether the heater discharge temperature Tp is greater than or equal to the desired discharge temperature T o plus T 5 (e.g., 20° C.), is the combination of which a predetermined temperature.
- the heater discharge temperature T p is greater than or equal to a value obtained by adding T 5 to the desired discharge temperature T o , the heater is turned off (S 5 ) by turning off the power supply to the heater (S 43 ) in order to prevent further power consumption from being generated by overheating the heater 120 .
- the controller may be configure to then perform the heater driving control step (S 3 ) that controls the desired discharge temperature To through the heater discharge temperature Tp by operation of the heater 120 .
- an operating condition re-determining step (S 6 ) that re-determines whether either the desired discharge temperature T o or the desired evaporator temperature T eo satisfies the heater operation conditions.
- the air-conditioning controller 110 determines whether the heater re-operation condition is satisfied, when the desired evaporator temperature T eo is T 2 (e.g., 2° C.) higher than the evaporator temperature T e or the desired discharge temperature T o is T 3 (e.g., 4° C.) higher than the desired evaporator temperature T eo .
- the air-conditioning controller 110 determines whether the desired evaporator temperature T eo is larger than a first value obtained by adding T 2 (e.g., 2° C.) to the evaporator temperature T e . Further, when the desired evaporator temperature T eo is greater than the first value obtained by adding T 2 (e.g., 2° C.) to the evaporator temperature T e , it is determined that the heater re-driving condition is satisfied, and a cut-off removal determining step (S 7 ) is performed. In doing so, the controller 110 determines whether the condition for removing cut-off of heater 120 is satisfied.
- T 2 e.g., 2° C.
- the air-conditioning controller 110 determines whether the desired discharge temperature T o is greater than a second value obtained by adding T 3 (e.g., 4° C.) to the desired evaporator temperature T eo , when the desired evaporator temperature T eo is equal to or less than the first value obtained by adding T 2 (e.g., 2° C.) to the evaporator temperature (S 62 ).
- T 3 e.g. 4° C.
- the air-conditioning controller 110 determines that the heater operating conditions are satisfied, and a cut-off removal determining step (S 7 ) is performed to determines whether the conditions for removing cut-off (turning on) of heater 120 is satisfied.
- the driving condition re-determining step (S 6 ) when it is determined that the heater driving condition is not satisfied, heater 120 is kept turned off (S 5 ), in a cut-off state.
- the desired discharge temperature T o is a T 6 (e.g., 64° C.) or less in the cut-off removal determining step (S 7 )
- the heater discharge temperature T p is T 1 (e.g., 15° C.) lower than the desired discharge temperature T o (S 71 ).
- the heater discharge temperature T p is less than a value obtained by adding T 1 (e.g., 15° C.) to the desired discharge temperature T o , it is determined that the heater cut-off removal condition is satisfied.
- the T 6 may be set to 64° C., for example. More specifically, temperature T 6 is a tuning value for the desired discharge temperature T o and may be set in accordance with the temperature control characteristics of the air conditioning system 100 .
- the heater 120 when the heater 120 is a PTC heater, the temperature is not increased immediately even if power is supplied, thus when the heater discharge temperature T p (measured now from heater 120 ) is less than the value obtained by adding T 1 (e.g., 15° C.) to the desired discharge temperature T o , the heater 120 may be turned back on (remove heater cut-off) (S 73 ) to easily control the discharge temperature from the air conditioning system 100 to the desired discharge temperature T o by allowing early for heating of the heater 120 .
- T 1 e.g. 15° C.
- the controller 110 determines whether the heater discharge temperature T p is less than or equal to T 7 (e.g., 84° C.) (S 72 ), and when the desired discharge temperature To is above T 6 and the desired discharge temperature T p is less than or equal to T 7 , it is determined that the cut-off removal condition is also satisfied.
- T 7 may be set to 84° C., for example.
- the heater 120 When the desired discharge temperature T o is greater than the T 6 , the heater 120 is operated earlier in comparison to when it is the T 6 or less, and when the heater discharge temperature T p is T 7 or less, it is determined that the heater cut-off removal condition is satisfied and the heater 120 is turned back on (S 73 ). When the cut-off of heater 120 is removed (i.e., the heater 120 is turned back on), the heater driving control step (S 3 ) that controls the operation of heater 120 is again operated so that the temperature of the air supplied into the vehicle becomes the desired discharge temperature T o .
- the present invention is able to prevent power from being consumed by operation of the heater 120 by turning off the heater 120 when certain temperature dependent and/or time dependent conditions are satisfied. These conditions are based on a desired discharge temperature T o , a desired evaporator temperature T eo , an evaporator temperature T e , and a heater discharge temperature T p . Further, the present invention can reduce the amount of power consumed by an air-conditioning system which is generated when a heater and an air conditioner are simultaneously operated by delaying operation of the heater when the air conditioner is in operation.
- the present invention may be embodied as computer readable media on a computer readable medium in an on-board computation unit containing executable program instructions executed by a processor.
- the computer readable mediums include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, and optical data storage devices.
- the computer readable recording medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
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Abstract
Description
- 1. Field of the Invention
- The present invention relates to a control method of an air conditioner, and more particularly, to a control method for an air conditioning system of an electric vehicle which prevents power from being consumed by a heater in the air conditioning system.
- 2. Description of Related Art
- Recently, along with the increase in interest in development of environmentally-friendly energy, electric vehicles that use batteries as an energy source have also been spotlighted in the vehicle industrial field. One of the noted problems with electric vehicles is that they have a shortened driving range. This means, that the consumer may only be able to drive the vehicle for a few hundred miles before the vehicle must be recharged at a charging station. Sometimes, these charging stations are not readily accessible to the consumer and thus the consumer is not able to travel long distances from his or her home where the charging stations are located. Accordingly, there is a consistent need to continually look for new ways to increase the total driving distance range for a battery in electric cars, due to the batteries limited accumulation of condensation.
- In electric vehicles, the internal cabin temperature of the vehicles is controlled by a separate electric heater and an air-conditioning system. In particular, power that is consumed by the air-conditioning system of an electric-vehicle is greater than that of engine-driven vehicles because the air-conditioning system in electric vehicles requires power consumption for separately driving the electric heater and the air-conditioning system even when it is hot in summer in order to control the internal temperature of the vehicles.
- Therefore, that the air-conditioning systems in electric vehicles can and do greatly effect the driving range of the electric vehicles. Although the range can be increased by limiting the usage of the air-conditioning system by the user, this comes a cost to the occupant who might find themselves very uncomfortable especially on hot summer days.
- The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
- The present invention has been made in an effort to provide a control method of an air conditioner that can prevent power from being consumed by driving a heater in an air conditioner by determining whether one or more heater cut-off conditions are satisfied from a desired discharge temperature, a desired evaporator temperature, an evaporator temperature, and a heater discharge temperature, and then cutting off the heater in response to a determination that one or more of these conditions are satisfied.
- Further, the present invention has been made in an effort to provide a control method of an air conditioner that can reduce power consumption by an air-conditioning system in the electric vehicle which is generated when a heater and an air conditioner are simultaneously operating by delaying operation of the heater when the air conditioner is in operation.
- An exemplary embodiment of the present invention provides a control method of an air conditioner, including determining, by a controller, whether either a desired discharge temperature from an air-conditioning system to maintain the internal cabin temperature of a vehicle at a desired internal temperature and a desired evaporator temperature that is an evaporator temperature satisfies a heater operating condition; controlling, by the controller, operation of the heater in accordance with temperature and traveling conditions of the vehicle to output the desired discharge temperature when the heater operating condition is satisfied; and cutting off operation of the heater when a measured heater discharge temperature of the heater is measured to be equal to or greater than a reference temperature or the heater discharge temperature is greater than the desired discharge temperature by a predetermined temperature or more when the heater is operated.
- The control method may further include re-determining whether at least the desired discharge temperature and the desired evaporator temperature satisfy the heater driving condition after the heater operation is cut off; and in response initiating operation of the heater when the heater operation condition is satisfied and the desired discharge temperature is a first temperature or less and the heater discharge temperature is a first predetermined amount T1, e.g., 15° C., lower than the desired discharge temperature.
- Furthermore, when the heater operation condition is satisfied and the desired discharge temperature is above the first temperature, the heater may again be operated when the heater discharge temperature is lower than a second temperature. Additionally, when the desired evaporator temperature is a second predetermined amount T2, e.g., 2° C., higher than the current measured evaporator temperature or the desired discharge temperature is a third predetermined amount T3, e.g., 4° C. higher than the desired evaporator temperature, the heater driving condition may be determined to be satisfied.
- The control method may further include an air-conditioning system driving determining and delaying step that keeps the heater “maxed out” for a predetermined time such that operation of the heater is performed after a predetermined time is passed when the air-conditioning system is being operated, as a result of determining whether the air-conditioning system is being operated after determining that a heater operating condition has been satisfied. Additionally, when it is determined that the air-conditioning system is not being operated the heater may then be controlled to operate in accordance with temperature and traveling conditions of the vehicle to output the desired discharge temperature when the heater operating condition is satisfied.
- For example, the heater operation may be cut off when the heater discharge temperature is a predetermined temperature T4, e.g., 85° C., or more, which is a reference temperature, or the heater discharge temperature is larger than the desired discharge temperature by a predetermined temperature, T5, 20° C., or more, which is a predetermined temperature for cutting off power to the heater.
- Advantageously, the control method of an air conditioner prevents power from being consumed by operation of a heater in an air conditioning system of an electric vehicle by determining whether one or more heater cut-off conditions are satisfied based a desired discharge temperature, a desired evaporator temperature, an evaporator temperature, and/or a heater discharge temperature, and then cutting off the heater in response to this determination. Further, according to the exemplary embodiments of the present invention can reduce the amount of power consumed by an air-conditioning system that is generated when a heater and an air conditioner are simultaneously operated by delaying operation of the heater while the air conditioner is in operation.
- The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description of the Invention, which together serve to explain certain principles of the present invention.
-
FIG. 1A andFIG. 1B are flowcharts illustrating a control method of an air conditioner according to an exemplary embodiment of the present invention. -
FIG. 2 is a block diagram showing the configuration of an air-conditioning system for illustrating the control method of an air conditioner shown inFIG. 1A andFIG. 1B . - It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
- In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.
- Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
- Exemplary embodiments of the present invention are described hereafter with reference to the accompanying drawings, for those skilled in the art to easily implement the present invention.
- It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of all electrically operated vehicles including fuel cell and hybrid vehicles and any configuration thereof in general, such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like. Further, this invention can also be modified to operate in fuel-computation vehicles as well. However, the examples below will be described with reference to an electric vehicle utilizing a battery as its main source of power.
- Referring to
FIGS. 1A , 1B, and 2, an air-conditioning controller 110 is installed and configured to calculate a desired discharge temperature, To, for discharged air from anair conditioning system 100 and a desired evaporator temperature, Teo, of a evaporator in air-conditioner (air con) 130, in order for a driver to maintain a desired internal temperature within the cabin of the vehicle. - Air-
conditioning controller 110 performs a driving condition determining step S1 that determines whether either the desired discharge temperature To or the desired evaporator temperature Teo, which were previously calculated by the air-conditioning controller 110, satisfy an operation condition for operating a heater within theair conditioning system 100. The air-conditioning controller 100 in the exemplary embodiment may be a controller of an FATC (Full Automatic Temperature Control) that controls operation of electronic devices such as aheater 120 and the air-con 130, which are each separate devices in theair conditioning system 100, in accordance with the state and temperature of the vehicle which are supplied from various sensors (not shown) in the vehicle. - For example, in the driving condition determining step S1, the air-
conditioning controller 110 may determine that a heater driving condition has been satisfied, when, for example, the desired evaporator temperature Teo is T2 degrees, e.g., 2° C., higher than the evaporator temperature Te measured from the evaporator in the air-con 130 or the desired discharge temperature To is T3, e.g., 4° C., higher than the desired evaporator temperature Teo. The air-conditioning controller 110 may determine whether the desired evaporator temperature Teo is larger than a first value obtained by adding T2, e.g., 2° C., to the evaporator temperature Te (S11) and determine that the heater driving condition is satisfied when the desired evaporator temperature Teo is larger than the first value obtained by adding T2, e.g., 2° C. to the evaporator temperature Te. - The air-
conditioning controller 110 may determine whether the desired discharge temperature To is larger than a second value obtained by adding T3, e.g., 4° C., to the desired evaporator temperature Teo, when the desired evaporator temperature Teo is equal to or smaller than the first value obtained by adding T2 to the evaporator temperature Te (S12). If To is not larger than a second value obtained by adding T3, e.g., 4° C., to the desired evaporator temperature Teo, the controller repeats steps (S11) and (S12) until one of the defined conditions are satisfied. In particular, the air-conditioning controller 110 determines that the heater operation condition has been satisfied when the desired discharge temperature To is larger than the value obtained by adding, T2, e.g., 4° C., to the desired evaporator temperature Teo. Alternatively, when it is determined that the heater operation condition is not satisfied,heater 120 is kept turned off (S5) and the controller repeats steps (S11) or (S61) and (S12) or (S62) until one of the heater operation conditions are satisfied. When it is determined that one of the heater operation conditions are satisfied in the driving condition determining step (S1), the controller then may, in some embodiments like the one shown inFIG. 1A , additionally determine whether air-con 130 is currently being operated (S21) and an air-con driving determining and delaying step (S2) that keepsheater 120 stopped for a predetermined time in accordance with whether air-con 130 is driven is performed. - First, when it is determined that air-
con 130 is not being operated (S21), a heater operation control step (S3) that controls the operation ofheater 120 in accordance with the temperature and traveling conditions of the vehicle is performed to output the desired discharge temperature To. When it is determined that air-con 130 is operated (S21), the air-conditioning controller 110 drives a timer t. The air-conditioning controller 110 determines whether a certain operational time has passed a predetermined time to from timer t (S23), and when the predetermined time to of timer t has passed, a heater operating control step (S3) that controls operation ofheater 120 is performed by thecontroller 110. The predetermined time to may be set at 1 minute, for example. - That is, when air-
con 130 is operated in conjunction with the air-con driving determining and delaying step/program (S2, the heater driving control step (S3) that controls driving ofheater 120 may be performed afterheater 120 is kept stopped for the predetermined time to in which the temperature of the evaporator is led to be decreased by, e.g., reducing the operational RPM of a compressor of air-con 130. - The air-
conditioning controller 110 controls the operation ofheater 120 which may be embodied as a Positive Thermal Coefficient (PTC) heater so that the temperature of air supplied fromair conditioning system 100 into the vehicle is controlled to become the desired discharge temperature To in accordance with the temperature of the internal/external air and conditions of the vehicle. The air-conditioning controller 100 controls the temperature of the air discharged fromheater 120 by controlling a operation signal supplied toheater 120 in a PWM (Pulse Width Modulation) type arrangement in order to control the discharge temperature ofair conditioning system 100 to the desired discharge temperature To. - While the heater is operating, a heater cut-off determining step (S4) is performed. This step (S4), cuts off driving of
heater 120 when the heater discharge temperature Tp, which is continually increased by drivenheater 120, is greater than or equal to a reference temperature T4 or when the heater discharge temperature Tp is greater than or equal at a predetermined temperature T5 plus a desired discharge temperature To. - For example, the air-
conditioning controller 110 may determine whether the heater discharge temperature Tp is 85° C. or more, which is the reference temperature T4, in the heater cut-off determining step (S41), and when it is determined that the heater discharge temperature Tp is T4 or more, the heater is turned off (S5) by turning off the heater (S43) to preventheater 120 from becoming overheated. The reference temperature T4 may be set at different values in accordance with the driving characteristics of the air-conditioning system of vehicles and the environment in which the vehicle is currently or has previously been driving in. - When it is determined that the heater discharge temperature Tp is less than the reference temperature T4 in step (S4), the air-
conditioning controller 110 then determines whether the heater discharge temperature Tp is greater than or equal to the desired discharge temperature To plus T5 (e.g., 20° C.), is the combination of which a predetermined temperature. When the heater discharge temperature Tp is greater than or equal to a value obtained by adding T5 to the desired discharge temperature To, the heater is turned off (S5) by turning off the power supply to the heater (S43) in order to prevent further power consumption from being generated by overheating theheater 120. - When the heater discharge temperature Tp is less than the reference temperature T4 and less than a value obtained by adding a predetermined temperature T5 to the desired discharge temperature To, the controller may be configure to then perform the heater driving control step (S3) that controls the desired discharge temperature To through the heater discharge temperature Tp by operation of the
heater 120. - In order to determine a cut-off removal condition for re-operating the
heater 120 when theheater 120 is turned off and kept turned off (S5) in (S4), an operating condition re-determining step (S6) that re-determines whether either the desired discharge temperature To or the desired evaporator temperature Teo satisfies the heater operation conditions. In the operation condition re-determining step S6, the air-conditioning controller 110 determines whether the heater re-operation condition is satisfied, when the desired evaporator temperature Teo is T2 (e.g., 2° C.) higher than the evaporator temperature Te or the desired discharge temperature To is T3 (e.g., 4° C.) higher than the desired evaporator temperature Teo. - In the driving condition re-determining step (S6), the air-
conditioning controller 110 determines whether the desired evaporator temperature Teo is larger than a first value obtained by adding T2 (e.g., 2° C.) to the evaporator temperature Te. Further, when the desired evaporator temperature Teo is greater than the first value obtained by adding T2 (e.g., 2° C.) to the evaporator temperature Te, it is determined that the heater re-driving condition is satisfied, and a cut-off removal determining step (S7) is performed. In doing so, thecontroller 110 determines whether the condition for removing cut-off ofheater 120 is satisfied. - The air-
conditioning controller 110 determines whether the desired discharge temperature To is greater than a second value obtained by adding T3 (e.g., 4° C.) to the desired evaporator temperature Teo, when the desired evaporator temperature Teo is equal to or less than the first value obtained by adding T2 (e.g., 2° C.) to the evaporator temperature (S62). Further, when the desired discharge temperature To is greater than the second value obtained by adding T3 (e.g., 4° C.) to the desired evaporator temperature Teo, the air-conditioning controller 110 then determines that the heater operating conditions are satisfied, and a cut-off removal determining step (S7) is performed to determines whether the conditions for removing cut-off (turning on) ofheater 120 is satisfied. - In the driving condition re-determining step (S6), when it is determined that the heater driving condition is not satisfied,
heater 120 is kept turned off (S5), in a cut-off state. When the desired discharge temperature To is a T6 (e.g., 64° C.) or less in the cut-off removal determining step (S7), it is determined whether the heater discharge temperature Tp is T1(e.g., 15° C.) lower than the desired discharge temperature To (S71). When the desired discharge temperature To less than or equal to T6 and the heater discharge temperature Tp is less than a value obtained by adding T1(e.g., 15° C.) to the desired discharge temperature To, it is determined that the heater cut-off removal condition is satisfied. The T6 may be set to 64° C., for example. More specifically, temperature T6 is a tuning value for the desired discharge temperature To and may be set in accordance with the temperature control characteristics of theair conditioning system 100. - Preferably, when the
heater 120 is a PTC heater, the temperature is not increased immediately even if power is supplied, thus when the heater discharge temperature Tp (measured now from heater 120) is less than the value obtained by adding T1(e.g., 15° C.) to the desired discharge temperature To, theheater 120 may be turned back on (remove heater cut-off) (S73) to easily control the discharge temperature from theair conditioning system 100 to the desired discharge temperature To by allowing early for heating of theheater 120. - When the desired discharge temperature To is greater than T6, the
controller 110 determines whether the heater discharge temperature Tp is less than or equal to T7 (e.g., 84° C.) (S72), and when the desired discharge temperature To is above T6 and the desired discharge temperature Tp is less than or equal to T7, it is determined that the cut-off removal condition is also satisfied. T7 may be set to 84° C., for example. - When the desired discharge temperature To is greater than the T6, the
heater 120 is operated earlier in comparison to when it is the T6 or less, and when the heater discharge temperature Tp is T7 or less, it is determined that the heater cut-off removal condition is satisfied and theheater 120 is turned back on (S73). When the cut-off ofheater 120 is removed (i.e., theheater 120 is turned back on), the heater driving control step (S3) that controls the operation ofheater 120 is again operated so that the temperature of the air supplied into the vehicle becomes the desired discharge temperature To. - Advantageously, the present invention is able to prevent power from being consumed by operation of the
heater 120 by turning off theheater 120 when certain temperature dependent and/or time dependent conditions are satisfied. These conditions are based on a desired discharge temperature To, a desired evaporator temperature Teo, an evaporator temperature Te, and a heater discharge temperature Tp. Further, the present invention can reduce the amount of power consumed by an air-conditioning system which is generated when a heater and an air conditioner are simultaneously operated by delaying operation of the heater when the air conditioner is in operation. - Furthermore, the present invention may be embodied as computer readable media on a computer readable medium in an on-board computation unit containing executable program instructions executed by a processor. Examples of the computer readable mediums include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, and optical data storage devices. The computer readable recording medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion.
- The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100088246A KR101210097B1 (en) | 2010-09-09 | 2010-09-09 | Driving method of air conditioner in electrical vehicle |
KR10-2010-0088246 | 2010-09-09 |
Publications (1)
Publication Number | Publication Date |
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US20120074236A1 true US20120074236A1 (en) | 2012-03-29 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/310,324 Abandoned US20120074236A1 (en) | 2010-09-09 | 2011-12-02 | Control method of air conditioner in electrical vehicle |
Country Status (4)
Country | Link |
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US (1) | US20120074236A1 (en) |
JP (1) | JP5824277B2 (en) |
KR (1) | KR101210097B1 (en) |
CN (1) | CN102434942B (en) |
Cited By (4)
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CN103557576A (en) * | 2013-10-15 | 2014-02-05 | 美的集团股份有限公司 | Method and system for controlling humidity of air conditioner |
CN105091239A (en) * | 2015-08-26 | 2015-11-25 | 珠海格力电器股份有限公司 | Air conditioner control method and air conditioner control system |
FR3101508A1 (en) * | 2019-10-01 | 2021-04-02 | Valeo Systemes Thermiques | Thermal management method, in particular for a motor vehicle, and associated control unit |
FR3101509A1 (en) * | 2019-10-01 | 2021-04-02 | Valeo Systemes Thermiques | Thermal management method, in particular for a motor vehicle, and associated control unit |
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KR101475793B1 (en) * | 2012-12-26 | 2014-12-30 | 한라비스테온공조 주식회사 | Air conditioning system for electric vehicle |
CN103453623A (en) * | 2013-09-13 | 2013-12-18 | 天津大学建筑设计研究院 | Water source heat pump air-conditioning system operating parameter optimization control method |
JP6383536B2 (en) * | 2013-12-09 | 2018-08-29 | カルソニックカンセイ株式会社 | Vehicle air-conditioning safety device and control method thereof |
KR101807061B1 (en) * | 2016-07-29 | 2017-12-08 | 현대자동차 주식회사 | Apparatus and method for plug-in hybrid electric vehicle |
CN110562009B (en) * | 2019-07-26 | 2021-03-16 | 浙江飞碟汽车制造有限公司 | Control method of air conditioner heater of electric automobile |
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CN105091239A (en) * | 2015-08-26 | 2015-11-25 | 珠海格力电器股份有限公司 | Air conditioner control method and air conditioner control system |
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Also Published As
Publication number | Publication date |
---|---|
KR20120026184A (en) | 2012-03-19 |
JP2012056562A (en) | 2012-03-22 |
KR101210097B1 (en) | 2012-12-07 |
CN102434942B (en) | 2016-02-10 |
JP5824277B2 (en) | 2015-11-25 |
CN102434942A (en) | 2012-05-02 |
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