JP5067306B2 - Vehicle air conditioning control device - Google Patents

Description

  The present invention relates to a vehicle air conditioning control device.

As a conventional vehicle air-conditioning control device, a cold storage material that stores cooling power when the compressor is driven is provided. There is one that lowers and increases sensible heat (hereinafter referred to as “cold storage amount”) (see, for example, Patent Document 1).
JP 2003-335128 A

  However, the above-described conventional vehicle air conditioning control device does not consider the engine power used to drive the generator, so that there is a problem that the fuel consumption is deteriorated.

  The present invention has been made paying attention to such conventional problems, and an object thereof is to suppress deterioration of fuel consumption while ensuring air conditioning performance.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this.

  The present invention is driven by a generator (21) that is driven by a crankshaft (11) to generate electric power, a capacitor (22) that stores electric power generated by the generator (21), and a crankshaft (11). The compressor (31) for compressing the refrigerant gas for air conditioning, the condenser (32) for cooling and condensing the refrigerant gas compressed by the compressor (31), and the electric power of the capacitor (22) A cooling fan (33) that is driven to forcibly suck in air to increase the cooling efficiency of the condenser (32), and an evaporation to cool the air by evaporating the refrigerant gas liquefied by the condenser (32). An air-conditioning control device for a vehicle comprising a cooler (37) and a cool storage material (37a) cooled by the evaporator (37), and an air volume determination means for determining an air volume of the cooling fan (33) S1, S21), cold storage amount estimation means (S2) for estimating the cold storage amount of the cold storage material (37a), and the compressor (31) so that the temperature of the evaporator (37) becomes the target temperature. Compressor control means (4) for controlling the discharge amount and, when the cold storage amount is smaller than a predetermined amount, a target temperature setting means during cold storage for setting the target temperature according to the air volume of the cooling fan (33) (S5, S25).

  According to the present invention, when the cold storage amount of the cold storage material is smaller than the predetermined amount, the target temperature of the evaporator is set according to the air volume of the cooling fan. That is, since the compressor is controlled according to the engine power used for driving the generator that generates the driving power for the cooling fan, the fuel efficiency can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a system schematic diagram of a vehicle air conditioner according to a first embodiment of the present invention.

  The vehicle air conditioner includes an engine 1, a power supply device 2, an air conditioner 3, and a controller 5.

  The engine 1 generates a driving force for rotating the wheels 13. A crank pulley 12 that rotates integrally with the crankshaft 11 is attached to one end of the crankshaft 11 of the engine 1.

  The power supply device 2 includes an alternator 21 that is driven by the power of the engine 1 to generate electric power, and a battery 22 that charges the electric power generated by the alternator 21.

  The alternator 21 is linked to the crank pulley 12 of the engine 1 by a belt 61 via an alternator pulley 23 provided at one end of the rotating shaft 22. An electromagnetic clutch 24 is interposed between the rotating shaft 22 and the alternator pulley 23. When the electromagnetic clutch 24 is engaged (turned on), the rotating shaft 22 of the alternator 21 rotates in synchronization with the crankshaft 11 of the engine 1. Thereby, the alternator 21 generates power. On the other hand, when the engagement of the electromagnetic clutch 24 is released (turned off), the rotating shaft of the alternator 21 rotates idly with respect to the crankshaft 11 of the engine 1 and power generation by the alternator 21 is not performed.

  The air conditioner 3 includes a compressor 31, a condenser 32, an electric cooling fan 33, an expansion valve 34, an air conditioning duct 35, an electric blower fan 36, and an evaporator 37.

  The compressor 31 is linked to the crank pulley 12 of the engine 1 by a belt 61 via a compressor pulley 39 provided at one end of the rotating shaft 38. An electromagnetic clutch 40 is interposed between the rotary shaft 38 and the compressor pulley 39. When the electromagnetic clutch 40 is engaged, the rotation shaft 38 of the compressor 31 rotates in synchronization with the crankshaft 11 of the engine 1. As a result, the compressor 31 sucks and compresses the refrigerant gas, and discharges the refrigerant gas having a high temperature and high pressure to the capacitor 32.

  The compressor 31 is, for example, a swash plate type variable capacity compressor capable of changing the discharge amount of the refrigerant gas. The compressor 31 is provided with a pressure control valve (not shown), and the controller 5 changes the internal swash plate angle by controlling the amount of current supplied to the electromagnetic coil provided in the pressure control valve. The discharge amount has been changed. The engine power required to drive the compressor 31 increases as the discharge amount increases.

  The condenser 32 cools and liquefies the high-temperature and high-pressure refrigerant gas sent from the compressor 31. The capacitor | condenser 32 is provided in the front surface of a radiator (not shown), and is cooled with driving | running | working wind.

  The electric cooling fan 33 is provided behind the radiator. The electric cooling fan 33 is driven by the electric power from the battery 22 when the vehicle is stopped or traveling at a low speed, forcibly sucking air, and increases the heat dissipation efficiency of the radiator. Further, when the air volume hitting the condenser 32 is insufficient, it is driven to forcibly suck in air, and the cooling efficiency of the condenser 32 is increased.

  The expansion valve 34 decompresses and expands the liquid refrigerant liquefied by the condenser 32 to form a low-temperature and low-pressure liquid refrigerant.

  The air conditioning duct 35 includes an air intake 35a for introducing outside air or inside air at one opening end, and a blowout port 35b communicating with the vehicle interior at the other opening end. An electric blower fan 36 and an evaporator 37 are provided inside the air conditioning duct 35.

  The electric blower fan 36 is driven by electric power from the battery 22 and blows the air sucked from the air intake port 35 a around the evaporator 37.

  The evaporator 37 evaporates liquid refrigerant that has been liquefied by the condenser 32 and has become low-temperature and low-pressure by the expansion valve 34, thereby removing heat from the air that passes around the evaporator 37 that is blown by the electric blower fan 36. Use cold air.

  Moreover, the evaporator 37 has accommodated between the tubes the cool storage material 37a using the heat of fusion when the phase changes from solid to liquid. The cool storage material 37 a is solidified by supplying the liquid refrigerant to the evaporator 37 and cooling the evaporator 37.

  The controller 5 is composed of a microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface).

  The controller 5 includes an evaporator temperature sensor 51 that detects the temperature of the evaporator 37, an indoor air temperature sensor 52 that detects the indoor temperature of the vehicle, an outdoor air temperature sensor 53 that detects the outside air temperature, and a solar radiation sensor 54 that detects the amount of solar radiation. Signals from various sensors are input.

  The controller 5 automatically stops the engine 1 if a predetermined engine stop condition is satisfied, for example, when the vehicle is stopped by waiting for a signal, and then restarts the engine 1 if a predetermined engine restart condition is satisfied. Idle stop control is implemented.

  Moreover, the controller 5 feedback-controls the discharge amount of the compressor 31 so that the temperature of the evaporator 37 cooled by the supply of the refrigerant gas becomes the target evaporator temperature in order to ensure the air conditioning performance.

  However, when the deceleration acceleration becomes too large during deceleration, it is necessary to decrease the deceleration acceleration by reducing the discharge amount of the compressor 31. Further, the compressor 31 cannot be driven during idle stop.

  Therefore, in this embodiment, in such a situation, the vehicle interior is cooled by the cold storage material 37a to ensure air conditioning performance.

  Here, what cools the regenerator material 37 a using the power of the engine 1 is a compressor 31 that discharges refrigerant gas and an alternator that generates electric power for the electric cooling fan 33.

  The electric cooling fan 33 is stopped when the vehicle speed increases and the condenser 32 can be sufficiently cooled only by the traveling wind. When the electric cooling fan 33 can be stopped, it is not necessary to drive the alternator 21 that generates electric power for driving the electric cooling fan 33.

  Therefore, when the cooling state is not required to drive the electric cooling fan 33, cooling the regenerator material 37a can suppress the deterioration of fuel consumption, and can efficiently cool the regenerator material 37a.

  Therefore, in the present embodiment, when the electric cooling fan 33 is stopped, the cool storage material 37a is cooled.

  FIG. 2 is a flowchart illustrating cold storage control of the vehicle air conditioner according to the present embodiment. The controller 5 executes this routine at a predetermined calculation cycle (for example, 10 ms) during operation of the engine.

  In step S1, the controller 5 determines whether or not the electric cooling fan 33 is stopped. The controller 5 shifts the process to step S2 when the electric cooling fan 33 is stopped, and shifts the process to step S4 when driven.

  In step S2, the controller 5 estimates the cold storage amount of the cold storage material 37a. The amount of cold storage can be calculated according to the evaporator temperature detected by the evaporator temperature sensor 51, the idle stop time, the time during which the discharge amount of the compressor 31 is reduced during deceleration, and the like. The longer the time during which the temperature of the evaporator 37 is lower than the solidification temperature of the cool storage material 37a, the greater the cool storage amount of the cool storage material 37a. On the other hand, the cool storage amount of the cool storage material 37a decreases as the idle stop time and the time during which the discharge amount of the compressor 31 is reduced during deceleration are longer.

  In step S3, the controller 5 determines whether or not the cold storage of the cold storage material 37a is completed. Specifically, the controller 5 determines whether or not the cold storage amount of the cold storage material 37a is larger than a predetermined amount, and determines that the cold storage is completed if it is larger than the predetermined amount. When it is determined that the cold storage of the cold storage material 37a has been completed, the controller 5 proceeds to step S4, and when it is determined that the cold storage is not completed, the process proceeds to step S5.

  In step S4, the controller 5 sets the target evaporator temperature to the normal target evaporator temperature. The normal target evaporator temperature is variably set according to the outside air temperature, the room temperature, the amount of solar radiation, and the like.

  In step S5, the controller 5 sets the target evaporator temperature to the target evaporator temperature during cold storage. The target evaporator temperature during cold storage is a predetermined temperature at which the cold storage material 37a is solidified and the evaporator 37 is not frozen.

  FIG. 3 is a time chart showing the operation of the cold storage control of the vehicle air conditioner according to the present embodiment. In the following explanation, in order to clarify the correspondence with the flowchart of FIG.

  When the vehicle speed becomes higher than the predetermined vehicle speed at time t1 (FIG. 3A), the controller 5 stops the electric cooling fan 33 (FIG. 3B). When the electric cooling fan 33 is stopped, the controller 5 estimates the cold storage amount of the cold storage material 37a (Yes in S1, S2), and determines whether or not the cold storage of the cold storage material 37a is completed (S3).

  Here, since the cold storage amount of the cold storage material 37a is smaller than the predetermined amount (maximum cold storage amount) (FIG. 3 (E)), the controller 5 sets the target evaporator temperature to the cold storage target evaporator temperature (FIG. 3 (C)). ; No in S3), the discharge amount of the compressor 31 is increased (FIG. 3D). Thereby, the temperature of the cool storage material 37a can be lowered | hung and the cool storage amount can be increased (FIG.3 (E)).

  When the cold storage amount of the cold storage material 37a becomes larger than a predetermined amount at time t2 (FIG. 3E), the controller 5 sets the target evaporator temperature to the normal target evaporator temperature (FIG. 3C; Yes in S3). ), The discharge amount of the compressor 31 is decreased (FIG. 3D).

  In the present embodiment, as the cold storage material 37a, the cold storage material 37a whose melting temperature is higher than the normal target evaporator temperature is used. The reason will be described below.

  In this embodiment, since the cold storage to the cold storage material 37a is performed at the time of high-speed traveling where the electric cooling fan 33 is stopped, it is necessary to maintain the cooling performance of the cold storage material 37a until the time of deceleration or idling stop. During low-speed running when the electric cooling fan 33 is driven, the target evaporator temperature is set to a normal target evaporator temperature that is higher than the cold-storage target evaporator temperature in order to suppress deterioration of fuel consumption.

  For this reason, if the normal target evaporator temperature is higher than the melting temperature of the cool storage material 37a, the cool storage material 37a melts during low-speed traveling, and the cooling performance of the cool storage material 37a can be maintained until deceleration or idle stop. become unable. Further, if the cooling power is maintained until deceleration or idling stop, even if the target evaporator temperature that can satisfy the air conditioning performance is higher than the melting temperature of the regenerator material 37a, the target evaporator temperature is set to the melting temperature of the regenerator material 37a. It must be set to the following, and fuel consumption deteriorates. Therefore, in the present embodiment, the regenerator material 37a whose melting temperature is always higher than the normal target evaporator temperature is used as the regenerator material 37a.

  In the present embodiment described above, when the electric cooling fan 33 is stopped, the discharge amount of the compressor 31 is increased and the target evaporator temperature is set to the target evaporator temperature during cold storage that is lower than the normal target evaporator temperature.

  Thereby, when the engine load is small, the cold storage material 37a can be stored cold, so that it is possible to ensure cooling performance during deceleration or idling stop while suppressing deterioration of fuel consumption.

  Further, as the cold storage material 37a, the cold storage material 37a having a melting temperature higher than the normal target evaporator temperature was used. Thereby, the cooling power of the cool storage material 37a stored at the time of high-speed travel where the electric cooling fan 33 stops can be maintained until deceleration or idling stop without deteriorating fuel consumption.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 4 and FIG. This embodiment is different from the first embodiment in that whether to store the cold storage material 37a is switched according to the air volume of the electric cooling fan 33. Hereinafter, the difference will be mainly described. In each of the following embodiments, the same reference numerals are used for portions that perform the same functions as those of the first embodiment described above, and repeated descriptions are omitted as appropriate.

  FIG. 4 is a flowchart illustrating cold storage control of the vehicle air conditioner according to the present embodiment.

  In step S21, the controller 5 determines whether or not the air volume of the electric cooling fan 33 is smaller than a predetermined amount. Specifically, the controller 5 determines whether or not the energization amount to the electric cooling fan 33 is smaller than a predetermined amount. If the air volume of the electric cooling fan 33 is smaller than the predetermined amount, the controller 5 proceeds to step S2, and if the air volume is larger than the predetermined amount, the controller 5 proceeds to step S3.

  About step S2-S4, since the process similar to 1st Embodiment is implemented, description is abbreviate | omitted.

  In step S25, the controller 5 sets the target evaporator temperature to the target temperature during cold storage. The target evaporator temperature during cold storage is variably set according to the air volume of the electric cooling fan 33.

  FIG. 5 is a diagram showing the relationship between the air volume of the electric cooling fan 33 and the target evaporator temperature during cold storage.

  As shown in FIG. 5, the target evaporator temperature during cold storage is set so as to decrease as the air volume of the electric cooling fan 33 decreases.

  According to the present embodiment described above, the same effect as that of the first embodiment can be obtained, and whether or not the cold storage material 37a is to be stored or not is switched according to the air volume of the electric cooling fan 33. The material 37a can be stored cold.

  Note that the present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  For example, in each of the embodiments described above, the regenerator material 37a is accommodated in the evaporator 37 and configured integrally with the evaporator 37. However, the regenerator material 37a is provided behind the evaporator, and the regenerator material 37a is regenerated by the cold air that has passed through the evaporator 37. May be.

It is a system schematic diagram of a vehicle air conditioner. It is a flowchart explaining the cool storage control of the vehicle air conditioner by 1st Embodiment. It is a time chart which shows the operation | movement of the cool storage control of the vehicle air conditioner by 1st Embodiment. It is a flowchart explaining the cool storage control of the vehicle air conditioner by 2nd Embodiment. It is the figure which showed the relationship between the air volume of an electric cooling fan, and the target evaporator temperature at the time of cool storage.

Explanation of symbols

1 Engine 5 Controller (Compressor control means)
11 Crankshaft 21 Alternator (generator)
22 Battery (capacitor)
31 Compressor
32 Condenser
33 Electric cooling fan (cooling fan)
37 Evaporator
37a Cold storage material 51 Evaporator temperature detection means S1 Air flow determination means S2 Cold storage amount estimation means S5 Cold storage target temperature setting means S21 Air flow determination means

Claims (4)

A generator driven by a crankshaft to generate electricity;
A battery for storing electric power generated by the generator;
A compressor that is driven by a crankshaft to compress refrigerant gas for air conditioning;
A condenser that cools and liquefies the refrigerant gas compressed by the compressor;
A cooling fan that is driven by the electric power of the capacitor and forcibly sucks air to increase the cooling efficiency of the condenser;
An evaporator that evaporates the refrigerant gas liquefied by the condenser and cools the air;
A regenerator material cooled by the evaporator;
A vehicle air conditioning control device comprising:
An air volume determining means for determining an air volume of the cooling fan;
Cold storage amount estimation means for estimating the cold storage amount of the cold storage material;
Compressor control means for controlling the discharge amount of the compressor so that the temperature of the evaporator becomes a target temperature;
When the cold storage amount is smaller than a predetermined amount, the cold storage target temperature setting means for setting the target temperature according to the air volume of the cooling fan;
An air conditioning control device for a vehicle, comprising: 2. The air conditioning control device for a vehicle according to claim 1, wherein the cold storage target temperature setting unit lowers the target temperature as the air volume of the cooling fan is smaller. 3. The vehicle air conditioning control device according to claim 1 or 2, wherein the target temperature is lower than a melting temperature of the cold storage material. Comprising an evaporator temperature detecting means for detecting the temperature of the evaporator;
The vehicle air conditioning control device according to any one of claims 1 to 3, wherein the cold storage amount estimation means estimates a cold storage amount of the cold storage material according to a temperature of the evaporator.

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