JP3323097B2 - Air conditioner for hybrid vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a driving engine,
The present invention relates to an air conditioner for a hybrid vehicle that heats or cools a cabin of a hybrid vehicle equipped with a traveling motor and a battery that supplies power to the traveling motor.

[0002]

2. Description of the Related Art In recent years, hybrid vehicles have been proposed in which each operation is automatically controlled by combining a gasoline engine with a battery, a driving motor, a generator, and the like so as to optimize gasoline combustion efficiency. is there. In this hybrid vehicle, power is transmitted only by the driving motor by energizing the driving motor with a battery at the time of starting or running at low speed, power is transmitted only by the gasoline engine during normal driving, and the driving motor is connected by the gasoline engine during accelerated driving. Both powers of the gasoline engine are transmitted. Also, in the case of a hybrid vehicle, when the charged amount of the battery is small, the gasoline engine rotates the generator to charge the battery, so that there is no need for external charging.

[0003]

However, a hybrid vehicle is very fuel-efficient by stopping the gasoline engine when it is not necessary to run or charge the battery, but the gasoline engine is frequently started and stopped. When such a hybrid vehicle is equipped with an air conditioner (air conditioner) similar to a general engine-driven vehicle, the following problem occurs.

[0004] First, in winter, when the outside air temperature is low, the temperature of the cooling water for cooling the gasoline engine was difficult to rise. As a result, the temperature of the cooling water supplied to the heater core serving as a heat exchanger for heating provided in the duct cannot be maintained at a predetermined cooling water temperature (for example, 80 ° C.). Absent. That is, there is a problem that the heating capacity in the vehicle compartment of the hybrid vehicle is insufficient.

In summer when the outside air temperature is high, when the cooling heat exchanger provided in the duct is constituted by an evaporator of a refrigeration cycle, an electromagnetic clutch driven by a gasoline engine by a belt is in an on state. However, since the gasoline engine repeatedly starts and stops, the compressor also repeatedly starts and stops.
As a result, even if the air is cooled by the evaporator to cool the vehicle interior to a desired temperature, the air conditioner does not cool down easily and the air conditioner does not work. That is, there is a problem that the cooling capacity in the vehicle compartment of the hybrid vehicle is insufficient.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner for a hybrid vehicle which can improve the air-conditioning capacity of a vehicle interior of the hybrid vehicle. Another object of the present invention is to provide an air conditioner for a hybrid vehicle that can improve the heating capacity of the vehicle interior of the hybrid vehicle.

[0007]

According to the first aspect of the present invention, the target air temperature of the air blown into the vehicle interior from the air conditioning unit is determined, and the determined target air temperature controls the air conditioning in the vehicle interior. If the temperature needs to be performed, an operation request signal is output from the air conditioning control device to the engine control device. Therefore, regardless of the driving state of the hybrid vehicle detected by the driving state detecting means, the engine control device operates the driving engine to air-condition the vehicle interior of the hybrid vehicle. improves.

According to the second aspect of the present invention, it is necessary to determine the target blow-off temperature of the air blown into the passenger compartment from the duct of the air conditioning unit, and to use the determined target blow-off temperature to perform air conditioning of the passenger compartment. In the case of temperature, an operation request signal is output from the air conditioning control device to the engine control device. Therefore, the refrigerant is rotationally driven by the traveling engine, whereby the refrigerant is circulated through the cooling heat exchanger.
As a result, the amount of heat absorbed by the cooling heat exchanger increases, so that sufficiently cooled air is blown out of the duct into the vehicle interior when passing through the cooling heat exchanger. It can be cooled sufficiently.

According to the third aspect of the present invention, the engine control device operates the traveling engine, whereby the cooling water sufficiently warmed by the traveling engine is supplied to the heating heat exchanger in the duct. You. For this reason, the temperature of the cooling water supplied to the heat exchanger for heating rises, and the temperature of the cooling water is maintained at the predetermined cooling water temperature. As a result, the amount of heat released from the heating heat exchanger increases, so that sufficiently heated air is blown out from the duct into the passenger compartment when passing through the heating heat exchanger. It can be heated sufficiently.

According to the fourth aspect of the present invention, the target outlet temperature determining means determines the target temperature from the set temperature set by the temperature setting means, the inside air temperature detected by the inside air temperature detecting means, and the outside air temperature detected by the outside air temperature detecting means. Then, the target blow temperature of the air blown from the duct is determined. If the target outlet temperature determined by the target outlet temperature determining means is equal to or higher than the predetermined temperature and the cooling water temperature detected by the cooling water temperature detecting means is equal to or lower than the set cooling water temperature, an operation request signal is sent from the air conditioning control device to the engine control device. , The engine control device operates the traveling engine. Thereby, an effect similar to that of the second aspect is obtained.

According to the fifth aspect of the present invention, the cooling water temperature detected by the cooling water temperature detecting means is set to a higher temperature as the target blowing temperature determined by the target blowing temperature determining means becomes higher. When the temperature is equal to or lower than the water temperature, an operation request signal is output from the air-conditioning control device to the engine control device, so that the engine control device operates the traveling engine.
Thereby, an effect similar to that of the second aspect is obtained.

According to the present invention, when the operation of the blower is stopped, a stop request signal is output from the air conditioning control device to the engine control device. Stop the operation of. Thus, when the air conditioning in the vehicle compartment is unnecessary, the combustion engine for the traveling engine can be stopped to improve the combustion efficiency of the fuel used for the traveling engine. Also, billing
According to the invention described in Item 7, for example, the cooling water temperature detecting means
When the detected cooling water temperature is lower than the set cooling water temperature,
During warm-up control, which controls to stop operation,
That is, when the blower water temperature delay control is being performed, the blower
Even if operation is stopped, an operation request signal is sent from the air conditioning controller.
Is output to the engine control unit.
The engine activates the driving engine. By doing so,
The engine control device activates the driving engine.
Cooling water temperature rises quickly and cool air
It is not blown out of G.

According to the eighth aspect of the present invention, the target blowing is performed.
Target blowing of air blown into the cabin by temperature determining means
Determine the temperature. Then, it is determined by the target outlet temperature determining means.
The detected target outlet temperature is higher than the specified temperature and the cooling water temperature is detected.
If the cooling water temperature detected by the means is below the set cooling water temperature
Means that the operation request signal from the air conditioning control unit is
Is output to Therefore, the cooling water of the driving engine
Or use power to air-condition the interior of a hybrid vehicle
As a result, the air-conditioning capacity of the vehicle interior is improved.
For example, the refrigerant compressor is rotated by the driving engine.
Thereby, the refrigerant is circulated through the cooling heat exchanger.
Thereby, an effect similar to that of the second aspect is obtained.
Can be In addition, the engine for driving
The cooled water is supplied to the heating heat exchanger. By that
Thus, the same effect as that of the third aspect can be obtained.
Wear.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

1 to 12 show an embodiment of the present invention. FIG. 1 is a diagram showing a schematic configuration of a hybrid vehicle, and FIG. 2 is a diagram showing an overall configuration of an air conditioner for a hybrid vehicle. FIG. 3 is a diagram showing a control system of the air conditioner for a hybrid vehicle.

The air conditioner for a hybrid vehicle according to the present embodiment is for starting a running gasoline engine (hereinafter abbreviated as a running engine) 1, a running motor 2 including a motor generator, and a running engine 1, for example. Air-conditioning unit for air-conditioning the cabin of a hybrid vehicle 5 equipped with an engine starting device 3 including a starting motor and an ignition device, and a battery (nickel-metal hydride battery) 4 for supplying power to the traveling motor 2 and the engine starting device 3 An automatic air conditioner configured to automatically control the temperature in the vehicle cabin to always maintain a set temperature by controlling each air conditioner (actuator) 6 by an air conditioning control device (hereinafter referred to as an air conditioner ECU) 7. .

The traveling engine 1 is removably connected to the axle of the hybrid vehicle 5 so as to be detachable. The traveling motor 2 is removably connected to the axle of the hybrid vehicle 5 so that the traveling motor 2 is connected to the axle when the traveling engine 1 is not connected to the axle. The traveling motor 2 is configured to be automatically controlled (for example, inverter controlled) by a hybrid control device (hereinafter referred to as a hybrid ECU) 8. Further, the engine starting device 3 is configured to be automatically controlled by an engine control device (hereinafter referred to as an engine ECU) 9 so that the combustion efficiency of gasoline (fuel) is optimized. The engine ECU 9 controls the energization of the engine starter 3 to operate the driving engine 1 when the hybrid vehicle 5 normally travels and when the battery 4 needs to be charged.

The air-conditioning unit 6 corresponds to the air-conditioning unit of the present invention. The air-conditioning unit 6 has an air-conditioning duct 10 inside which forms an air passage for guiding conditioned air into the passenger compartment of the hybrid vehicle 5. The generated centrifugal blower 30, a refrigeration cycle 40 for cooling air flowing in the air conditioning duct 10 to cool the vehicle interior, and a cooling water for heating air flowing in the air conditioning duct 10 to heat the interior of the vehicle. It comprises a circuit 50 and the like.

The air-conditioning duct 10 is a hybrid vehicle 5
It is arranged on the front side in the passenger compartment of the vehicle. Air conditioning duct 1
The most upstream side (windward side) of 0 is a part constituting a suction port switching box (inside / outside air switching box), and has an inside air suction port 11 for taking in vehicle interior air (hereinafter referred to as inside air), and a vehicle outside air (hereinafter outside air). ) To take in the outside air.

Further, inside and outside air (suction port) switching dampers 13 are rotatably mounted inside the inside air suction port 11 and the outside air suction port 12. This inside / outside air switching damper 1
Reference numeral 3 is driven by an actuator 14 such as a servomotor to switch the suction port mode to an inside air circulation mode, an outside air introduction mode, or the like. The inside / outside air switching damper 13 constitutes inside / outside air switching means together with the suction port switching box.

Further, at the most downstream side (downwind side) of the air conditioning duct 10, a defroster (DEF) opening, a face (FACE) opening and a foot (FOOT) opening are formed at a portion constituting an air outlet switching box. Is formed. And
A defroster duct 15 is connected to the DEF opening, and a defroster (DEF) outlet 18 that mainly blows warm air toward the inner surface of the windshield of the hybrid vehicle 5 is provided at the most downstream end of the defroster duct 15. Is open.

A face duct 16 is connected to the FACE opening, and a face (FACE) outlet 19 for blowing mainly cool air toward the occupant's head and chest at the most downstream end of the face duct 16. It is open. Further, a foot duct 17 is connected to the FOOT opening, and a foot (FOOT) outlet 20 for mainly blowing warm air toward the feet of the occupant opens at the most downstream end of the foot duct 17. ing.

Two outlet switching dampers 21 are rotatably mounted inside each outlet. 2
Each of the outlet switching dampers 21 is driven by an actuator 22 such as a servomotor, and switches the outlet mode to a face (FACE) mode and a bi-level (B / L) mode.
Mode, foot (FOOT) mode, foot differential (F /
D) Switch to either mode or defroster (DEF) mode. The two outlet switching dampers 21 are:
An outlet switching means is formed together with the outlet switching box.

The centrifugal blower 30 has a centrifugal fan 31 rotatably housed in a scroll case integrally formed with the air conditioning duct 10, and a blower motor 32 for rotating the centrifugal fan 31. . And
The blower motor 32 controls the amount of air blown (the rotation speed of the centrifugal fan 31) based on a blower terminal voltage (hereinafter, referred to as a blower voltage) applied via a blower drive circuit 33.

The refrigeration cycle 40 is a compressor (corresponding to a refrigerant compressor of the present invention) 41 which compresses the refrigerant by being belt-driven by the traveling engine 1 and a condenser (refrigerant condenser) 42 which condenses and liquefies the compressed refrigerant. A receiver (liquid receiver, gas-liquid separator) 43 for separating the condensed and liquefied refrigerant into gas and liquid and flowing only the liquid refrigerant downstream; an expansion valve (expansion valve, decompression means) 44 for decompressing and expanding the liquid refrigerant;
An evaporator (refrigerant evaporator) 45 for evaporating and evaporating the refrigerant decompressed and expanded, and a refrigerant pipe or the like connecting these in an annular manner.

The evaporator 45 corresponds to the cooling heat exchanger of the present invention, and is disposed in the air-conditioning duct 10 so as to cover the entire air passage and cools the air passing therethrough. The indoor heat exchanger performs a cooling operation and an air dehumidifying operation for dehumidifying the air passing therethrough.
An electromagnetic clutch 46 is connected to the compressor 41 as clutch means for intermittently transmitting rotational power from the traveling engine 1 to the compressor 41. The electromagnetic clutch 46 is controlled by a clutch drive circuit 47.

Then, the electromagnetic clutch 46 is energized (ON).
At this time, the rotational power of the traveling engine 1 is transmitted to the compressor 41, the air cooling action is performed by the evaporator 45, and the energization of the electromagnetic clutch 46 is stopped (OF).
F), the traveling engine 1 and the compressor 41 are shut off, and the air cooling action by the evaporator 45 is stopped. Here, the condenser 42 is disposed in a location that is likely to receive traveling wind generated when the hybrid vehicle 5 travels, and has outdoor heat for exchanging heat between the refrigerant flowing inside and the outside air and traveling wind blown by the cooling fan 48. It is an exchanger.

The cooling water circuit 50 is a circuit for circulating cooling water heated by a water jacket of the traveling engine 1 by a water pump (not shown).
It has a thermostat (neither is shown) and a heater core 51. The heater core 51 corresponds to the heating heat exchanger of the present invention, in which cooling water for cooling the traveling engine 1 flows, and the cooling water is reheated using the cooling water as a heating heat source.

The heater core 51 is disposed downstream of the evaporator 45 in the air conditioning duct 10 so as to partially block the air passage. Heater core 51
An air mix damper 52 is rotatably mounted on the upstream side of the air. This air mix damper 52
Is driven by an actuator 53 such as a servomotor, and adjusts the ratio of the amount of air passing through the heater core 51 to the amount of air bypassing the heater core 51 depending on the stop position, thereby controlling the temperature of air blown into the vehicle interior. It acts as a blowing temperature adjusting means for adjusting.

Next, the configuration of the control system of this embodiment is shown in FIG.
A description will be given based on FIG. 3 and FIG. Air conditioner ECU7
, A communication signal output from the engine ECU 9, a switch signal from each switch on a control panel 60 provided on the front of the vehicle compartment, and a sensor signal from each sensor are input.

Here, each switch on the control panel 60 is, as shown in FIG.
An air conditioner (A / C) switch 61 for instructing the start and stop of the (compressor 41), a suction port changeover switch 62 for switching the suction port mode, and a temperature setting for setting the temperature in the passenger compartment to a desired temperature. A lever (corresponding to a temperature setting means of the present invention) 63, an air volume switching lever 64 for switching the air volume of the centrifugal fan 31, an air outlet switching switch for switching the air outlet mode, and the like.

The outlet switch is provided with F
FACE switch 65 for fixing to ACE mode, bi-level (B / L) switch 66 for fixing to B / L mode, foot (FOOT) switch 67 for fixing to FOOT mode, F / D A foot differential (F / D) switch 68 for fixing to the DEF mode and a defroster (DE for fixing to the DEF mode)
F) There is a switch 69 and the like.

Each sensor is, as shown in FIG. 3, an inside air temperature sensor (corresponding to the inside air temperature detecting means of the present invention) 71 for detecting the air temperature (inside air temperature) in the vehicle interior, and a sensor outside the vehicle interior. An outside air temperature sensor (corresponding to an outside air temperature detecting means of the present invention) 72 for detecting an air temperature (outside air temperature), a solar radiation sensor (insolation detecting means) 73 for detecting an amount of solar radiation radiated into a vehicle cabin, A post-evaporation temperature sensor (cooling degree detecting means) 74 for detecting the cooling degree, a water temperature sensor (corresponding to the cooling water temperature detecting means of the present invention) 75 for detecting the temperature (cooling water temperature) of the cooling water flowing into the heater core 51, and the like. There is. Among these, the thermistor is used specifically for the inside air temperature sensor 71, the outside air temperature sensor 72, and the water temperature sensor 75. And the temperature sensor 7 after evaporation
Reference numeral 4 denotes a post-evaporation temperature detecting means such as a thermistor for detecting the air temperature (post-evaporation temperature) immediately after passing through the evaporator 45.

A microcomputer including a CPU, a ROM, a RAM and the like (not shown) is provided inside the air conditioner ECU 7, and sensor signals from the sensors 71 to 75 are supplied to an A / A by an input circuit (not shown) in the air conditioner ECU 7. It is configured to be input to a microcomputer after being D-converted. In addition, air conditioner ECU
When the ignition switch of the hybrid vehicle 5 is turned on (ON), the DC power supply 7 is supplied from the battery 4 to operate.

Next, a control process of the air conditioner ECU 7 of the present embodiment will be described with reference to FIGS. Here, FIG. 5 is a flowchart showing a basic control process by the air conditioner ECU 7.

First, when the ignition switch is turned on (ON) and DC power is supplied to the air conditioner ECU 7, the routine of FIG. 5 is started, and each initialization and initialization are performed (step S1). Subsequently, a switch signal is read from each switch such as the temperature setting lever 63 (temperature setting means: step S2). Subsequently, sensor signals from the inside air temperature sensor 71, the outside air temperature sensor 72, the solar radiation sensor 73, the post-evaporation temperature sensor 74, and the water temperature sensor 75 are output to A.
The / D-converted signal is read (inside air temperature detecting means, outside air temperature detecting means: step S3).

Subsequently, the target blowing temperature (TAO) of the air to be blown into the vehicle compartment is calculated based on the following equation (1) stored in the ROM in advance (target blowing temperature determining means: step S4).

## EQU1 ## TAO = Kset × Tset−KR × TR−K
AM × TAM−KS × TS + C where Tset is the set temperature set by the temperature setting lever 63, TR is the inside air temperature detected by the inside air temperature sensor 71,
TAM is the outside air temperature detected by the outside air temperature sensor 72, TS
Is the amount of solar radiation detected by the solar radiation sensor 73. Also, K
set, KR, KAM, and KS are gains, and C is a correction constant.

Subsequently, the blower voltage (voltage applied to the blower motor 32) corresponding to the cooling water temperature (TW) detected by the water temperature sensor 75 is determined from the characteristic diagram (map, see FIG. 6) stored in the ROM in advance. To perform warm-up control (blower delay control). This warm-up control is executed in winter when the outside air temperature is low, or when the outlet mode is the B / L mode or the FOOT mode. When the cooling water temperature (TW) rises to, for example, 60 ° C. or more, R
A blower voltage (voltage applied to the blower motor 32: V) corresponding to the target blowout temperature (TAO) is determined from the characteristic diagram (map, see FIG. 7) stored in the OM (blowing amount determining means: step S5).

Here, in determining the blower voltage, OF
F indicates a position where the power supply to the blower motor 32 is stopped.
UTO indicates a position for automatically controlling the blower voltage of the blower motor 32, LO indicates that the minimum value of the blower voltage is applied to the blower motor 32 (minimum air volume), and ME indicates
Indicates a position where an intermediate value of the blower voltage is applied to the blower motor 32 (intermediate air volume), and HI indicates a position where the maximum value of the blower voltage is applied to the blower motor 32 (maximum air volume).

Subsequently, an inlet mode corresponding to the target outlet temperature (TAO) is determined from the characteristic diagram (map, see FIG. 8) stored in the ROM in advance (step S6). Here, in the determination of the suction port mode, the target air outlet temperature (TAO) is determined to be in the inside air circulation mode and the outside air introduction mode from a low temperature to a high temperature. The inside air circulation mode refers to the inside / outside air switching damper 13 shown in FIG.
This is a suction port mode in which the inside air is suctioned from the inside air suction port 11 by setting the position at a dashed line position. The outside air introduction mode is a suction port mode in which the inside / outside air switching damper 13 is set at the solid line position in FIG.

Here, the outlet mode is set by the FACE switch 65 and the B / L switch 6 on the control panel 60.
6. The outlet mode is set by one of the outlet switching switches of the FOOT switch 67, the F / D switch 68 and the DEF switch 69.

Subsequently, the target damper opening (SW) of the air mix damper 52 is calculated based on the following equation (2) stored in the ROM in advance (damper opening determining means: step S7).

SW = {(TAO-TE) / (TW-TE)} × 100 (%) TE is the post-evaporation temperature detected by the post-evaporation temperature sensor 74 and the cooling water temperature detected by the water temperature sensor 75. .

When it is calculated that SW ≦ 0 (%), the air mix damper 52 is controlled to a position (MAXCOOL position) where all the cool air from the evaporator 45 is bypassed from the heater core 51. Also, SW ≧ 1
When calculated as 00 (%), the air mix damper 52 is controlled to a position (MAXHOT position) where all of the cool air from the evaporator 45 passes through the heater core 51.
Further, when it is calculated as 0 (%) <SW <100 (%), the air mix damper 52 is connected to the evaporator 45.
A part of the cool air from the heater core 51 is passed through the heater core 51, and the rest of the cool air is controlled to a position where it is bypassed from the heater core 51.

Subsequently, E / GON request determination control is performed.
That is, the subroutine shown in FIG. 10 is called, and an engine operation request (E / GON) signal for requesting the start of the driving engine 1 is output to the engine ECU 9 or an engine stop requesting for stopping the driving of the driving engine 1. An engine operation request determination is made to determine whether to output a request (E / GOFF) signal (damper opening determination means: step S
8).

Subsequently, when the A / C switch 61 is ON, the operation state of the compressor 41 is determined. That is, the start and stop of the compressor 41 are determined based on the post-evaporation temperature (TE) detected by the post-evaporation temperature sensor 74 (step S9). Specifically, RO
As shown in the characteristic diagram (map, see FIG. 9) stored in M, when the post-evaporation temperature (TE) detected by the post-evaporation temperature sensor 74 is equal to or higher than the first frost formation temperature (for example, 4 ° C.), The energization control (ON) of the electromagnetic clutch 46 is performed so that the compressor 41 is started (ON), and the refrigeration cycle 40 is operated. That is, the evaporator 45 is operated (air cooling action).

When the post-evaporation temperature (TE) detected by the post-evaporation temperature sensor 74 is lower than a second frost formation temperature (for example, 3 ° C.) lower than the first frost formation temperature, the compressor 4
1 so that the operation of the electromagnetic clutch 46 is stopped (OFF).
Is controlled (OFF) to stop the operation of the refrigeration cycle 40. That is, the air cooling operation of the evaporator 45 is stopped.

Subsequently, control signals are output to the actuators 14, 22, 53, the blower drive circuit 33 and the clutch drive circuit 47 so that the control states calculated or determined in steps S5 to S9 are obtained. I do. Further, an engine operation request (E / GON) signal or an engine stop request (E / G
OFF) signal is output (step S10). And
In step S11, the control waits for a control cycle time t (for example, 0.5 to 2.5 seconds) and then proceeds to step S2.
It returns to the control processing of.

Next, the control process for determining the engine operation request will be described with reference to FIGS. Here, FIG.
0 is a flowchart showing a control process for determining an engine operation request. Note that the flowchart of FIG.
This is executed when the air volume switching lever 64 is set to the AUTO position.

First, it is determined whether or not the outlet mode is set to the B / L mode or the FOOT mode. That is, the B / L switch 66 or the FOOT switch 6
7 is determined to be pressed (step S2).
1). If the result of this determination is NO, step S24
Shifts to the control process. If the result of the determination in step S21 is YES, it is determined whether or not the blower delay control (warm-up control) is being performed (step S2).
2). If the result of this determination is YES, the engine EC
An E / GON signal is transmitted to U9 (step S2)
3). Then, the process exits this subroutine.

If the result of the determination in step S22 is NO, the blower motor 32 is turned off (= blowing amount is 0).
It is determined whether or not it has been performed (step S24). If the result of this determination is YES, an E / GOFF signal is transmitted to engine ECU 9 (step S25). Then, the process exits this subroutine.

On the other hand, if the decision result in the step S24 is NO, it is decided whether or not the target blowing temperature (TAO) determined in the step S4 in FIG. 5 is higher than a predetermined temperature (for example, 30 ° C.) (step S26). . If the result of this determination is NO, the process shifts to the control process of step S25, and an E / GOFF signal is transmitted to the engine ECU 9. Also,
If the determination result in step S26 is YES, it is determined whether the cooling water temperature (TW) detected by the water temperature sensor 75 is equal to or lower than a set cooling water temperature (TWS: for example, 75 ° C.) (step S27). If the result of this determination is NO, the process shifts to the control process of step S25, and an E / GOFF signal is transmitted to the engine ECU 9.

If the result of the determination in step S27 is YES
In the case of, the process shifts to the control process of step S23 to transmit an E / GON signal to the engine ECU 9. Here, the set cooling water temperature (TWS) of the cooling water temperature (TW) detected by the water temperature sensor 75 is, for example, 5 as shown in a characteristic diagram (map, see FIG. 11) stored in the ROM in advance.
Between 5 ° C. and 75 ° C., the temperature is set to increase as the target blowing temperature (TAO) determined in step S4 of FIG. 5 increases. In addition, the air volume switching lever 6
4 is not the AUTO position, but OFF position, LO position, M
When operated to either E position or HI position,
The flowchart of FIG. 10 is executed from the control processing of step S24.

Next, a control process of the engine ECU 9 of this embodiment will be described with reference to FIG. Here, FIG. 12 is a flowchart showing a basic control process by the engine ECU 9.

The engine ECU 9 receives sensor signals as operating state detecting means for detecting the operating state of the hybrid vehicle 5 and communication signals from the air conditioner ECU 7 and the hybrid ECU 8. As the sensors, an engine speed sensor, a vehicle speed sensor, a throttle opening sensor, a battery voltmeter, a coolant temperature sensor (all not shown), and the like are used. A CPU, a ROM (not shown),
A microcomputer including a RAM or the like is provided, and a sensor signal from each sensor is A / D converted by an input circuit (not shown) in the engine ECU 9 and then input to the microcomputer.

First, when the ignition switch is turned on (ON) and DC power is supplied to the engine ECU 9, the routine of FIG. 12 is started, and each initialization and initialization are performed (step S31). Subsequently, each sensor signal is read (step S32).

Subsequently, communication (transmission and reception) with the hybrid ECU 8 is performed (step S33). Subsequently, communication (transmission and reception) with the air conditioner ECU 7 is performed (step S34). Subsequently, on / off of the traveling engine 1 is determined based on each sensor signal (step S35). If the determination result is ON, a control signal is output to the engine starting device 3 including the starting motor and the ignition device so as to start (ON) the traveling engine 1 (step S36). After that, step S32
Return to

Further, the result of the determination in step S35 is OFF.
In this case, it is determined whether or not an E / GON signal requesting to start the traveling engine 1 has been received from the air conditioner ECU 7 (operation request signal determination means: step S37). If the result of this determination is NO, the air conditioner E
Since the E / GOFF signal has been received from the CU 7, the traveling engine 1
A control signal is output so as to stop (OFF) the operation of (Step S38). Thereafter, the process returns to step S32.

If the result of the determination in step S37 is YES
In the case of, the process shifts to step S36 to output a control signal to the engine starting device 3 to start (ON) the traveling engine 1. In the flowchart of FIG. 12, a stop request signal determining means for determining whether or not the E / GOFF signal is received from the air conditioner ECU 7 is provided. The process may shift to the control process of S38, and a control signal may be output to the engine starting device 3 so as to stop (OFF) the operation of the traveling engine 1.

[Operation of Embodiment] Next, the operation of the air conditioner for a hybrid vehicle according to this embodiment will be briefly described with reference to FIGS.

In this embodiment, the set temperature (Tset) set by the temperature setting lever 63, the inside air temperature (TR) detected by the inside air temperature sensor 71, the outside air temperature (TAM) detected by the outside air temperature sensor 72, and From the amount of solar radiation (TS) detected by the solar radiation sensor 73, the target outlet temperature (TA) of the air blown out from the outlet of the air conditioning duct 10 into the vehicle compartment
O) is determined.

When the target air temperature (TAO) determined by the air conditioner ECU 7 is lower than a predetermined temperature (for example, 30 ° C.), or when the cooling water temperature (TW) detected by the water temperature sensor 75 is equal to the set cooling water temperature (for example, If the temperature is higher than 0 ° C. to 75 ° C. (changed according to TAO), the traveling engine 1 is not started by the engine starting device 3 including the starting motor and the ignition device. Therefore, when it is not necessary to charge the battery 4 for supplying electric power to the traveling of the hybrid vehicle 5 or the traveling motor 2, and furthermore, it is not necessary to heat the vehicle interior, the operation of the traveling engine 1 is stopped. Thereby, the fuel efficiency of the hybrid vehicle 5 can be greatly improved.

When the target outlet temperature (TAO) is equal to or higher than a predetermined temperature (for example, 30 ° C.) and the cooling water temperature (TW) detected by the water temperature sensor 75 is equal to the set cooling water temperature (TWS: for example, 0 ° C. to 75 ° C.), the TAO In this case, the traveling engine 1 is started by the engine starting device 3. Therefore, since the compressor 41 driven by the belt by the traveling engine 1 can be started, the refrigeration cycle 40 can be operated.
Further, by operating the traveling engine 1, the temperature of the cooling water flowing back into the water jacket of the traveling engine 1 rises early, so that the temperature of the cooling water supplied to the heater core 51 becomes a predetermined cooling water temperature (for example, (About 80 ° C.).

For this reason, the air sucked into the air-conditioning duct 10 passes through the evaporator 45 at, for example, 4 ° C.
After being cooled to the extent, it is reheated (reheated) when passing through the heater core 51 and is blown into the vehicle interior.
As a result, the target outlet temperature (T
AO) can be easily made by each air-conditioning means, and the temperature in the passenger compartment can be quickly brought closer to the set temperature set by the occupant operating the temperature setting lever 63.

Further, the cooling water temperature (TW) detected by the water temperature sensor 75 is 4
When the temperature is lower than 0 ° C., as shown in the characteristic diagram of FIG. 6, the power supply to the blower motor 32 is stopped (OF) in order to prevent the cool air from blowing out from the air conditioning duct 10.
F). In such a case, since the blower motor 32 is turned off, if the driving engine 1 is not started, the cooling water temperature does not rise and the driving engine 1
Also does not lead to efficient driving conditions. Therefore, during such warm-up control, the traveling engine 1 is started even if the blower motor 32 is turned off.

[Effects of the Embodiment] As described above, in the air conditioner for a hybrid vehicle according to the present embodiment, the detected cooling water temperature (TW) is equal to or lower than the set cooling water temperature (for example, 75 ° C.) and is calculated. When the target outlet temperature (TAO) is equal to or higher than a predetermined temperature (for example, 30 ° C.), that is, even if the cooling water temperature is lower than a predetermined cooling water temperature (for example, 80 ° C.)
When it is necessary to heat the cabin of the hybrid vehicle 5, for example, regardless of whether the A / C switch 61 is ON or OFF, the B / L switch 66, the FOOT switch 67, and the F /
When the D switch 68 is pressed, the driving engine 1 can be operated instead of the driving motor 2 as a power source of the hybrid vehicle 5 even when the hybrid vehicle 5 starts or runs at low speed. Then, the traveling engine 1 is quickly warmed up, and the temperature of the cooling water warmed by the traveling engine 1 rises.

Therefore, the sufficiently heated cooling water flows into the heater core 51, and
Heat dissipation increases. As a result, the air sufficiently heated when passing through the heater core 51 is blown out from the FOOT outlet 20 of the air conditioning duct 10 into the vehicle interior, so that the vehicle interior of the hybrid vehicle 5 can be sufficiently heated. it can. Alternatively, when it is necessary to remove the fogging on the inner surface of the windshield of the hybrid vehicle 5, sufficiently heated air is blown out of the DEF outlet 18 of the air conditioning duct 10 into the vehicle interior. Fog can be quickly removed.

The air conditioner for a hybrid vehicle according to the present embodiment, when it is necessary to cool or dehumidify the cabin of the hybrid vehicle 5, for example, by using an A / C switch 6
When the hybrid vehicle 5 is turned on, the engine 1 can be operated even when the hybrid vehicle 5 starts or runs at a low speed. Thereby, the refrigerant is supplied into the evaporator 45. As a result, the amount of heat absorbed by the evaporator 45 increases, so that low-humidity air sufficiently cooled when passing through the evaporator 45 is blown into the vehicle interior from the FACE outlet 19 of the air conditioning duct 10 or the like. Therefore, the passenger compartment can be sufficiently cooled.

Alternatively, when it is necessary to dehumidify and heat the cabin of the hybrid vehicle 5, for example, the A / C switch 6
1 is ON and the F / D switch 68 or the DEF switch 69 is pressed, a part of the cool air blown out from the evaporator 45 is reheated by the heater core 51 and then the DEF outlet 18 of the air conditioning duct 10 is turned on. From inside the vehicle, the interior of the vehicle of the hybrid vehicle 5 can be dehumidified, and the windshield can be prevented from fogging.

In the air conditioner for a hybrid vehicle according to the present embodiment, when it is not necessary to air-condition the cabin of the hybrid vehicle 5, for example, the air volume switching lever 64 is turned on.
When the rotation speed of the centrifugal fan 31 is equal to or lower than the set rotation speed, for example, when the blower motor 32 is turned off by setting the FF position, the air conditioner ECU 7
From the E / GON signal to the engine ECU 9. Thereby, by stopping the operation of the traveling engine 1, it is not necessary to unnecessarily drive the traveling engine 1 at the time of starting, traveling at a low speed, or when the charge amount of the battery 4 is sufficient. Get better. Therefore, not only the amount of fuel used for the traveling engine 1 is reduced, but also the exhaust gas emitted from the hybrid vehicle 5 can be reduced, so that the hybrid vehicle 5 becomes a very low fuel consumption and low pollution vehicle.

Further, the air conditioner for a hybrid vehicle according to the present embodiment, when the cooling water temperature (TW) detected by the water temperature sensor 75 is equal to or lower than the set cooling water temperature (for example, 40 ° C.)
Turn off blower motor 32 to prevent cold air from blowing out
Blower delay time (for example, 30 seconds to
(5 minutes) to prevent the blowing of cool air.
During the warm-up control for turning off the vehicle 2, the traveling engine 1 is operated regardless of the operating state of the hybrid vehicle 5. Therefore, when the cooling water temperature is very low, such as in winter when the outside temperature is low,
Even if the blower motor 32 is turned off, it is possible to prioritize raising the cooling water temperature to a predetermined cooling water temperature over low fuel consumption and low pollution. As the warm-up control, there is blower delay control for turning off the blower motor 32 in order to prevent hot air from blowing out in summer when the outside air temperature is high.

[Other Embodiments] In the present embodiment, the present invention is applied to an air conditioner (automatic air conditioner) for a hybrid vehicle automatically controlled by an air conditioner ECU 7, but the present invention is applied to a hybrid vehicle controlled by a manual operation. It may be applied to an air conditioner (manual air conditioner). Further, the present invention may be applied to a hot water type heating device for a hybrid vehicle in which a blower and a heat exchanger for heating are arranged in the air conditioning duct 10. Further, the present invention may be applied to a cooling device for a hybrid vehicle in which a blower and a heat exchanger for cooling are arranged in the air conditioning duct 10.

In the present embodiment, the heater core 51 using cooling water as a heat source for heating is used as a heat exchanger for heating.
A condenser using the heat of condensation of the refrigerant as a heat source for heating may be used as the heat exchanger for heating. Further, the indoor heat exchanger may function as a condenser and the outdoor heat exchanger may function as an evaporator by reversing the flow direction of the refrigerant in the refrigeration cycle with a four-way valve or the like.

In the present embodiment, the set temperature Tset, the inside air temperature TR, the outside air temperature TA
Although the target outlet temperature TAO is calculated based on M and the solar radiation amount TS, the target outlet temperature determining means calculates the target outlet temperature TAO based on at least the set temperature Tset and the inside air temperature TR. Is also good. Further, the target outlet temperature TAO may be calculated based on at least the set temperature Tset, the inside air temperature TR, and the outside air temperature TAM. Further, the suction temperature of the air sucked into the evaporator 45 may be considered as the target blowing temperature TAO.

Here, in step S25 in FIG. 10, the target damper opening (SW) of the air mix damper 52 is set.
Is near MAXCOOL (for example, 20% or less) or MA
It is determined that the temperature is near XHOT (for example, 80% or more), and SW ≧ 80 which is desired to heat the vehicle interior
(%) Or SW ≦ 20 (%) for cooling the passenger compartment
At this time, an E / GOFF signal may be transmitted.

In the present embodiment, the calculated target blowing temperature T
When AO is equal to or higher than a predetermined temperature (for example, 30 ° C.) and cooling water temperature TW is equal to or lower than a set cooling water temperature (for example, 75 ° C.), E / G
Although the ON signal is transmitted to the engine ECU 9,
It may be determined whether to transmit the E / GON signal to the engine ECU 9 based on only the value of the target outlet temperature TAO. That is, when the outside air temperature TAM is lower than the first set value (for example, 15 ° C.), or when the A / C switch 6
B / L switch 66, FO regardless of ON / OFF of 1
When the OT switch 67 or the F / D switch 68 is pressed or the like, and heating of the vehicle interior is desired, when the target outlet temperature TAO is equal to or higher than a first predetermined temperature (for example, 30 ° C. to 50 ° C.), the cooling water temperature is increased. Regardless, the E / GON signal may be transmitted to the engine ECU 9.

When the outside air temperature TAM is equal to or higher than the second set value (for example, 25 ° C.), or when the A / C switch 61 is
N, and when the FACE switch 65 or the B / L switch 66 is pressed, for example, when cooling in the passenger compartment is desired, the target outlet temperature TAO is lower than the first predetermined temperature at the second predetermined temperature (for example, 0). When the temperature is equal to or lower than (.degree. C. to 10.degree. C.), the E / GON signal may be transmitted to the engine ECU 9 regardless of the cooling water temperature. Furthermore, the outside air temperature TAM
When the temperature is equal to or less than a set value (for example, 20 ° C.) or when the A / C switch 61 is turned on and the F / D switch 68 or D
When dehumidification and heating of the vehicle interior is desired, for example, when the EF switch 69 is pressed, the target outlet temperature TAO is set to a temperature between the first predetermined temperature and the second predetermined temperature (for example, 10 ° C. to 30 ° C.).
C), an E / GON signal may be transmitted to the engine ECU 9 regardless of the cooling water temperature.

In this embodiment, the air mix damper 52
The air mix temperature control method is adopted in which the target damper opening SW is changed to adjust the temperature of the air blown into the vehicle cabin, but the amount of hot water flowing into the heater core 51 is adjusted and the temperature of the air blown into the vehicle cabin is adjusted. A reheat type temperature control method for adjusting the temperature may be adopted. In the present embodiment, a receiver cycle is used as the refrigeration cycle 40, but an accumulator cycle may be used as the refrigeration cycle. Further, as the pressure reducing means, a capillary tube or an orifice may be used in addition to the expansion valve.

In the present embodiment, the water temperature sensor 75 for detecting the temperature of the cooling water flowing into the heater core 51 is used as the cooling water temperature detecting means, but the cooling water in the water jacket of the traveling engine 1 is used as the cooling water temperature detecting means. A water temperature sensor for detecting the temperature may be used. Further, the cooling water temperature detecting means may be attached to any part of the cooling water circuit 50 to detect the temperature of the cooling water passing through that part.

In this embodiment, the water pump for circulating the cooling water in the cooling water circuit 50 is driven to rotate by the traveling engine 1, but an electric water pump may be used as the water pump. . In this case, even when the cooling water temperature of the traveling engine 1 is equal to or higher than the set cooling water temperature (for example, 75 ° C.), the cooling water in the water pump is operated by operating the water pump.
1 and the radiator, it is possible to heat the vehicle interior and cool the traveling engine 1. Alternatively, the electromagnetic clutch 46 of the compressor 41 may be eliminated, and the traveling engine 1 and the compressor 41 may be directly connected.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a hybrid vehicle (an embodiment).

FIG. 2 is a schematic diagram illustrating an overall configuration of an air conditioner for a hybrid vehicle (embodiment).

FIG. 3 is a block diagram showing a control system of the air conditioner for a hybrid vehicle (embodiment).

FIG. 4 is a plan view showing a control panel (embodiment).

FIG. 5 is a flowchart showing basic control processing by the air conditioner ECU (embodiment).

FIG. 6 is a characteristic diagram showing a relationship between a target blowout temperature and a blower voltage (embodiment).

FIG. 7 is a characteristic diagram showing a relationship between a cooling water temperature and a blower voltage (embodiment).

FIG. 8 is a characteristic diagram showing a relationship between a target outlet temperature and a suction port mode (Embodiment).

FIG. 9 is a characteristic diagram showing an operating state of a compressor with respect to a post-evaporation temperature (embodiment).

FIG. 10 is a flowchart showing a control process for determining an engine operation request in FIG. 5 (embodiment).

FIG. 11 is a characteristic diagram showing a relationship between a target blowout temperature and a cooling water temperature (embodiment).

FIG. 12 is a flowchart showing basic control processing by an engine ECU (embodiment).

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 traveling engine 2 traveling motor 3 engine starting device 4 battery 5 hybrid vehicle 6 air conditioner unit (air conditioning unit) 7 air conditioner ECU (air conditioning control device, target outlet temperature determining means) 8 hybrid ECU 9 engine ECU (engine control device) 10 Air conditioning duct 30 Centrifugal blower 40 Refrigeration cycle 41 Compressor (refrigerant compressor) 45 Evaporator (Heat exchanger for cooling) 46 Electromagnetic clutch 50 Cooling water circuit 51 Heater core (Heat exchanger for heating) 60 Control panel 63 Temperature setting lever (Temperature) Setting means) 71 inside air temperature sensor (outside air temperature detecting means) 72 outside air temperature sensor (outside air temperature detecting means) 73 solar radiation sensor 74 post-evaporation temperature sensor 75 water temperature sensor (cooling water temperature detecting means)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takamitsu Matsuno 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tadashi Nakagawa 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation ( 56) References JP-A-6-286459 (JP, A) JP-A-1-240316 (JP, A) JP-A-5-221233 (JP, A) JP-A-9-233601 (JP, A) JP-A-7-52634 (JP, A) JP-A-7-215045 (JP, A) JP-A-57-130811 (JP, A) JP-A-58-140811 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B60H 1/32 625 B60H 1/08 621 B60H 1/00 B60H 1/32 623 B60H 1/00 101 B60H 1/08 F02D 45/00 310 B60H 1/32 622 B60L 11/00 B60K 9/00

Claims (8)

(57) [Claims] (A) an air conditioning unit provided in a hybrid vehicle equipped with a traveling engine and a traveling motor for performing air conditioning in a vehicle cabin by using cooling water or power of the traveling engine; and (b) An engine control device having operating state detecting means for detecting an operating state of the hybrid vehicle, and controlling start and stop of the driving engine in accordance with the operating state detected by the operating state detecting means; An air-conditioning control device that controls the operation and stoppage of the air-conditioning unit. The air-conditioning control device determines a target outlet temperature of air blown into the passenger compartment from the air-conditioning unit, and determines the determined target outlet temperature. When the temperature of the vehicle interior needs to be air-conditioned, the engine control device sends an operation request signal requesting that the traveling engine be operated. Outputs, the engine control unit, the air conditioning control device when the input of the operation request signals from the hybrid vehicle air conditioning apparatus characterized by operating the vehicle running engine. 2. The air conditioner for a hybrid vehicle according to claim 1, wherein the air conditioning unit includes a duct for sending air into a vehicle interior, and a blower for generating an air flow in the duct toward the vehicle interior. A refrigerant compressor that compresses a refrigerant by the power of the traveling engine; and a cooling unit that is disposed in the duct and exchanges heat between the refrigerant discharged from the refrigerant compressor and the air in the duct to cool the air. An air conditioner for a hybrid vehicle, comprising: a heat exchanger for a hybrid vehicle. 3. The air conditioner for a hybrid vehicle according to claim 2, wherein the air conditioning unit is disposed downstream of the cooling heat exchanger in the duct, and supplies cooling water of the traveling engine to a heat source. An air conditioner for a hybrid vehicle, comprising a heating heat exchanger for reheating air. 4. The air conditioner for a hybrid vehicle according to claim 3, wherein the air conditioning control device is configured to set a temperature in the vehicle compartment to a desired temperature, and a temperature of the inside air to detect a temperature in the vehicle compartment. Detecting means, an outside air temperature detecting means for detecting a temperature outside the vehicle compartment, a set temperature set by the temperature setting means, an inside air temperature detected by the inside air temperature detecting means, and an outside air temperature detected by the outside air temperature detecting means, A target blow-off temperature determining means for determining a target blow-off temperature of air blown from the duct; and a cooling water temperature detecting means for detecting a temperature of cooling water for the traveling engine, the target blow-off temperature determined by the target blow-off temperature determining means. When the temperature is equal to or higher than a predetermined temperature and the cooling water temperature detected by the cooling water temperature detecting means is equal to or lower than a set cooling water temperature, an operation request signal is output to the engine control device. Air conditioner for a hybrid vehicle, characterized by. 5. The air conditioner for a hybrid vehicle according to claim 4, wherein the air conditioning control device is configured to determine whether a cooling water temperature detected by the cooling water temperature detecting means is equal to a target blowing temperature determined by the target blowing temperature determining means. An air conditioner for a hybrid vehicle, which outputs an operation request signal to the engine control device when the cooling water temperature is lower than a set cooling water temperature set to a higher temperature as the temperature increases. 6. The air conditioner for a hybrid vehicle according to claim 2, wherein the air conditioning control device requests a stop of the operation of the engine when the operation of the blower is stopped. To the engine control device, wherein the engine control device stops the operation of the traveling engine when a stop request signal is input from the air conditioning control device. 7. The air conditioner for a hybrid vehicle according to claim 6, wherein the air conditioning control device sends an operation request signal to the engine control device when the operation of the blower is stopped during the warm-up control. An air conditioner for a hybrid vehicle characterized by output. 8. The method according to claim 1, wherein
2. The air conditioner for a hybrid vehicle according to item 1.
The air-conditioning control device is configured to control a target of air blown into the vehicle interior.
Target outlet temperature determining means for determining an outlet temperature, and a cooling water temperature for detecting a temperature of the cooling water for the traveling engine.
Detecting means for detecting the target outlet temperature determined by the target outlet temperature determining means.
A temperature equal to or higher than a predetermined temperature, and
When the cooling water temperature is lower than the set cooling water temperature, the engine control
C. outputting the operation request signal to a device.
Airbrid air conditioner for automobiles.