JPH06206424A - Heat pump type air-conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To prevent a hunting and make the temperature in the car room reach an objective value accurately by operating the rotation frequency at the starting of control depending on the ambient condition inside and outside the car room, and operating the starting time of reducing the rotation frequency depending on the difference between the temperature in the car room and the object temperature, and its rate of change. CONSTITUTION:When a heating operation is carried out by an air-conditioning device including a compressor 1 driven by an engine, for example, the rotation frequency at the starting time of heating is decided according to the ambient condition inside and outside a car room. Then, the difference between the temperature inside the car room and an objective temperature, and the relation with its rate of change are found, and when it satisfies the condition, it is transferred to a control to reduce the rotation frequency. When the difference is large and the rate of change is small for example, the rotation frequency fixation is maintained. After it is transferred to the control to reduce the rotation frequency, the rotation frequency is decided depending on the temperature difference and its rate of change, and the relation of the rotation frequency and the rate of change of the temperature difference. Consequently, a hunting can be prevented, and the temperature in the car room is focused in the objective temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for automatically controlling the temperature inside a vehicle by heating and cooling the vehicle with a heat pump.

[0002]

2. Description of the Related Art In a conventional fuel-driven vehicle air conditioner, for example, as shown in the concrete structure of FIG. After the heat is radiated to the air outside the vehicle compartment by the exchanger 2 and the air blower 3 for the outdoor heat exchanger to condense and liquefy the refrigerant, the refrigerant is guided to the indoor heat exchanger 5 via the refrigerant expansion device 4, and the indoor air blower is supplied. The air blown by 6 was evaporated while cooling and the air-cooling action was performed.

The heating function is to stop the compressor 1 and let the engine cooling water (warm water) flow through the heater core 15 to heat the air blown by the indoor blower 6.

The temperature of the air blown from the vehicle interior air outlets 10, 11, 12 is adjusted by adjusting the opening of the mix damper 16 arranged in the ventilation duct 20.
This is performed by adjusting the amounts of warm air flowing through the heater core 15 and cold air bypassing the heater core 15.

Further, the automatic adjustment of the passenger compartment temperature is performed by, for example, FIG.
As shown in FIG.
1, the vehicle interior temperature sensor 22, the solar radiation amount sensor 23, the set temperature input device 24 calculates the mix damper opening degree, and outputs it to the mix damper adjusting actuator 27. Here, the calculation is the sum of the basic mix damper opening based on the vehicle exterior temperature and the corrected mix damper opening based on the difference between the vehicle interior temperature and the target temperature as shown in FIG.

On the other hand, a heat pump type air conditioner for driving a compressor by an electric motor, for example, an air conditioner for an electrically driven automobile is shown in FIG.
Shown in. The cooling action is similar to the above, but since there is no cooling water (warm water) for the engine in the heating device, the four-way switching valve 7 is used downstream of the compressor 1 to reverse the refrigerant flow path, and the indoor heat exchanger is used. After heating the air blown by the indoor air blower 6 to condense and liquefy the refrigerant, the refrigerant is guided to the outdoor heat exchanger 2 via the refrigerant expansion device 4, where the air outside the vehicle is cooled. At the same time, heat pump heating is performed in which the refrigerant absorbs heat and evaporates. Therefore, since there is no mix damper like the air conditioner for a fuel-driven automobile, the blow-out temperature is adjusted by controlling the electric motor driving device 9 that drives the electric motor 8 to adjust the rotation speed of the compressor 1. Become. In addition, switching between heating and cooling is performed by the four-way switching valve 7
Is performed by switching the refrigerant flow path.

[0007]

In the heat pump type air conditioner, it is necessary to change the conventional method of adjusting the mix damper opening from the conventional method of adjusting the rotational speed of the compressor 1 for the automatic adjustment of the vehicle interior temperature. . Further, in the conventional method of adjusting the mix damper opening, which is the sum of the basic mix damper opening and the corrected mix damper opening based on the difference between the vehicle interior temperature and the target temperature, the vehicle may be affected by variations in the performance of the air conditioner. The indoor temperature will be stable with some error from the target temperature.

Therefore, an object of the present invention is to provide a heat pump type air conditioner for a vehicle, which is different from the conventional one and automatically adjusts the temperature inside the vehicle.

[0009]

In order to solve the above-mentioned problems, the present invention provides, as a first means, a rotation speed for maintaining and maintaining the vehicle interior temperature at a target temperature based on at least the vehicle interior and exterior environmental conditions. Equipped with a control device that calculates and outputs, the control device calculates the number of revolutions at the time of control start based on the environmental conditions inside and outside the vehicle, and the start time of lowering the number of revolutions is the difference between the vehicle interior temperature and the target temperature and its change rate. And the rotation speed thereafter is calculated based on the relationship between the difference and the change rate thereof and the rotation speed and the change rate of the difference.

In order to solve the above-mentioned problems, the present invention uses the first means to calculate the time when the rotational speed starts to decrease based on the environmental conditions inside and outside the vehicle.

In order to solve the above problems, the present invention provides, as a third means, a control device for calculating and outputting a rotational speed for maintaining and maintaining a vehicle interior temperature at a target temperature based on at least the vehicle interior and exterior environmental conditions. The control device, when the difference between the vehicle interior temperature and the target temperature is equal to or greater than a predetermined value, sets the rotation speed between the basic rotation speed based on the environmental condition outside the vehicle interior and the corrected rotation speed based on the difference between the vehicle interior temperature and the target temperature. If the difference between the vehicle interior temperature and the target temperature is equal to or less than a predetermined value, the sum is calculated based on the relationship between the difference and the change rate thereof and the rotational speed and the change rate of the difference.

In order to solve the above-mentioned problems, the present invention provides a fourth means, in which the PID of the difference between the vehicle interior temperature and the target temperature is determined when the difference between the vehicle interior temperature and the target temperature is equal to or less than a predetermined value in the third means. Proportion / Integral / Derivative
total / Differentiation)) control.

[0013]

According to the first means of the present invention, the rotational speed at the time of control start is calculated based on the environmental conditions inside and outside the vehicle, so that the blowout temperature at start can be determined according to the heat load and comfort. it can. Further, the lowering timing of the rotation speed is calculated on the basis of the relationship between the difference between the vehicle interior temperature and the target temperature and the change rate thereof, and the rotation speed is calculated from the difference and the change rate thereof and the rotation speed and the change rate of the difference. Since the calculation is performed on the basis of the relationship, it is possible to prevent the vehicle interior temperature from reaching the target temperature, such as hunting, and to accurately reach the target temperature.

According to the second means of the present invention, in the first means of the present invention, the time when the rotational speed starts to be reduced is calculated based on the environmental conditions inside and outside the vehicle, so that the vehicle speed can be increased according to the heat load. The indoor temperature can accurately reach the target temperature.

According to the third means of the present invention, when the difference between the vehicle interior temperature and the target temperature is greater than or equal to a predetermined value, the rotational speed is set to the difference between the basic rotational speed based on the environmental conditions inside and outside the vehicle and the vehicle interior temperature and the target temperature. Since it is the sum of the corrected rotational speed based on the above, it becomes easy to adjust the blowout temperature change and the passenger compartment temperature change according to the comfort level. On the other hand, when the difference between the vehicle interior temperature and the target temperature is less than or equal to a predetermined value, the calculation is performed based on the relationship between the difference and the change rate thereof and the rotational speed and the change rate of the difference, so that the vehicle interior temperature accurately reaches the target temperature. Can be made.

According to the fourth means of the present invention, in the third means of the present invention, when the difference between the passenger compartment temperature and the target temperature is less than a predetermined value, PID control of the difference between the passenger compartment temperature and the target temperature is performed. Therefore, like the third means, the vehicle interior temperature can be accurately reached to the target temperature.

[0017]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a vehicle heat pump type air conditioner according to an embodiment of the present invention. Here, the difference from the configuration diagram of the conventional heat pump type air conditioner for a vehicle shown in FIG. 8 is that in the embodiment of the present invention, the vehicle outside temperature required to automatically adjust the vehicle interior temperature as compared with the conventional example shown in FIG. The point is that a sensor 21, a vehicle interior temperature sensor 22, a solar radiation sensor 23, a set temperature input device 24, and a control device 25 are added.

In the case of heating, the four-way switching valve 7 is set as shown by the solid line in FIG. The discharged refrigerant is guided to the indoor heat exchanger 5 by the compressor 1. Next, the air blown by the indoor blower 6 is heated to condense and liquefy the refrigerant.
The air carried to the outdoor heat exchanger 2 and blown by the outdoor heat exchanger air blower 3 is cooled and evaporated.

In order to automatically adjust the vehicle interior temperature, the controller 25 is controlled by the controller 25 based on information from the vehicle exterior temperature sensor 21, the vehicle interior temperature sensor 22, the solar radiation sensor 23, and the set temperature input device 24. Is calculated and output to the motor drive device 9.

FIG. 2 shows an air conditioning operation diagram according to the first embodiment of the present invention for heating. The operation is as follows.

The number of rotations at the time of starting the heating is determined by the environmental conditions inside and outside the vehicle. For example, it is determined to be high when the vehicle exterior temperature is low, and low when the vehicle exterior temperature is relatively high and the heating heat load is small. Then, in FIG. 2, up to point A is fixed.

Here, when the difference between the vehicle interior temperature and the target temperature and the rate of change thereof are checked and the requirements are satisfied, the control is shifted to lower the rotation speed. For example, if the difference is large but the rate of change is large, the control shifts to control to reduce the rotational speed to prevent hunting, and if the difference is large and the rate of change is small, the rotational speed is kept fixed.

After shifting to the control for lowering the rotational speed, the rotational speed is determined based on the relationship between the difference and the change rate thereof and the rotational speed and the change rate of the difference. For example, if the difference is large and the rate of change is large, and the rate of change for the rotational speed adjustment is small,
Further, reduce the rotation speed. If the rate of change with respect to the rotation speed adjustment is large, the rotation speed is not reduced.

As described above, hunting is prevented and the vehicle interior temperature is accurately reached to the target temperature. In addition, when calculating the time to start lowering the rotation speed based on the environmental conditions inside and outside the vehicle,
For example, if the vehicle exterior temperature is low, the control for lowering the rotation speed is delayed to accelerate the vehicle interior temperature drop. When the outside temperature of the vehicle is relatively high and the heating heat load is small, the control for lowering the rotation speed is accelerated, and a comfortable feeling is maintained without maintaining an unnecessarily high blowout temperature.

FIG. 3 shows an air conditioning operation diagram according to the second embodiment of the present invention for heating. The operation is as follows.

At the beginning of heating when the difference between the vehicle interior temperature and the target temperature is large, the sum of the basic rotation speed and the corrected rotation speed is set. For example, it is determined by the air conditioning operation specification diagram shown in FIG. When the vehicle interior temperature is still low and the difference between the vehicle interior temperature and the target temperature is large, the corrected rotational speed is large and the sum of the basic rotational speed is large.
As the vehicle interior temperature rises, the difference between the vehicle interior temperature and the target temperature decreases, so that the rotation speed decreases as shown in FIG. This way of lowering can be changed by the characteristic of the corrected rotation speed in FIG. For example, if the inclination is increased, the temperature rise in the vehicle interior can be accelerated.

When the difference between the vehicle interior temperature and the target temperature becomes less than a predetermined value, the difference and the rate of change thereof and the relationship between the rotational speed and the rate of change of the difference are determined, so that the same operation as in the first embodiment is performed. Becomes

When the difference between the vehicle interior temperature and the target temperature becomes equal to or less than a predetermined value, the same applies to the PID control of the difference between the vehicle interior temperature and the target temperature.

For example, the difference may be calculated from the difference between the passenger compartment temperature and the target temperature, the derivative, and the integral, and the rotation speed at the time of shifting to the PID control may be used as the start to calculate the change and the sum may be calculated.

Various arrangements, numbers, and configurations of heat exchangers can be applied within the scope of the gist of the present invention. In the above embodiment, the cooling is described, but the same applies to the heating. Also, although only the outside temperature of the vehicle is used as the determining factor of the basic rotation speed, the set temperature, the amount of solar radiation, etc. may be included. The corrected rotation speed has a linear characteristic with respect to the difference between the vehicle interior temperature and the target temperature, but may have a curved line or a characteristic of several lines using the vehicle exterior temperature or the like as a parameter.

[0032]

According to the first means of the present invention, the rotational speed at the time of control start is calculated based on the environmental conditions inside and outside the vehicle, so the blowout temperature at start is determined according to the heat load and comfort. be able to. Further, the lowering timing of the rotation speed is calculated on the basis of the relationship between the difference between the vehicle interior temperature and the target temperature and the change rate thereof, and the rotation speed is calculated from the difference and the change rate thereof and the rotation speed and the change rate of the difference. Since the calculation is performed on the basis of the relationship, it is possible to prevent the vehicle interior temperature from reaching the target temperature, such as hunting, and to accurately reach the target temperature.

According to the second means of the present invention, in the first means of the present invention, the time when the rotational speed starts to be reduced is calculated based on the environmental conditions inside and outside the vehicle, so that the vehicle speed can be increased according to the heat load. The indoor temperature can accurately reach the target temperature.

According to the third means of the present invention, when the difference between the vehicle interior temperature and the target temperature is equal to or more than a predetermined value, the rotational speed is set to the basic rotational speed based on the environmental conditions inside and outside the vehicle and the difference between the vehicle interior temperature and the target temperature. Since it is the sum of the corrected rotational speed based on the above, it becomes easy to adjust the blowout temperature change and the passenger compartment temperature change according to the comfort level. On the other hand, when the difference between the vehicle interior temperature and the target temperature is less than or equal to a predetermined value, the calculation is performed based on the relationship between the difference and the change rate thereof and the rotational speed and the change rate of the difference, so that the vehicle interior temperature accurately reaches the target temperature. Can be made.

According to the fourth means of the present invention, in the third means of the present invention, when the difference between the passenger compartment temperature and the target temperature is less than a predetermined value, PID control of the difference between the passenger compartment temperature and the target temperature is performed. Therefore, like the third means, the vehicle interior temperature can be accurately reached to the target temperature.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle heat pump type air conditioner according to an embodiment of the present invention.

FIG. 2 is an air conditioning operating characteristic diagram according to the first embodiment of the present invention.

FIG. 3 is an air conditioning operating characteristic diagram according to a second embodiment of the present invention.

FIG. 4A is an air conditioning operation specification diagram according to a second embodiment of the present invention, and FIG. 4B is a same air conditioning operation specification diagram.

FIG. 5 is a configuration diagram of a conventional air conditioner for a vehicle driven by a fuel engine.

FIG. 6 is a block diagram of a conventional automatic air conditioner for a vehicle driven by a fuel engine.

FIG. 7 (a) is an air-conditioning operation specification diagram of a conventional automatic air-conditioning system for a vehicle driven by a fuel engine, and (b) is an air-conditioning operation specification diagram of the same.

FIG. 8 is a configuration diagram of a conventional vehicle heat pump type air conditioner.

[Explanation of symbols]

 1 Compressor 2 Outdoor heat exchanger 3 Blower for outdoor heat exchanger 4 Refrigerant expansion device 5 Indoor heat exchanger 6 Indoor blower 7 Four-way switching valve 8 Electric motor 24 Set temperature input device 25 Control device 26 Engine 27 For adjusting mix damper Actuator

Claims (4)

[Claims] 1. A heat pump type air conditioner for a vehicle in which blow-out temperature can be adjusted by adjusting the number of revolutions of a compressor, for maintaining the temperature inside the vehicle at a target temperature based on at least the environmental conditions inside and outside the vehicle. A control device for calculating and outputting the rotation speed is provided, and the control device calculates the rotation speed at the time of control start based on the environmental condition inside and outside the vehicle compartment, and sets the start time of the rotation speed as the difference between the vehicle interior temperature and the target temperature. A heat pump type air conditioner for a vehicle, characterized in that it is calculated on the basis of the relationship with the change rate, and the number of revolutions thereafter is calculated on the basis of the relationship between the difference and the rate of change and the relationship between the number of revolutions and the rate of change of the difference. apparatus. 2. The heat pump type air conditioner for a vehicle according to claim 1, wherein the time when the rotation speed starts to be reduced is calculated based on the environmental conditions inside and outside the vehicle. 3. A heat pump type air conditioner for a vehicle, in which the blowout temperature can be adjusted by adjusting the number of revolutions of a compressor, in order to maintain the temperature inside the vehicle at a target temperature based on at least the environmental conditions inside and outside the vehicle. The control device includes a control device that calculates and outputs the rotation speed, and when the difference between the vehicle interior temperature and the target temperature is a predetermined value or more, the control device determines the rotation speed based on the environmental conditions inside and outside the vehicle, the basic rotation speed, the vehicle interior temperature, and the target temperature. When the difference between the vehicle interior temperature and the target temperature is less than or equal to a predetermined value, it is calculated based on the relationship between the difference and its change rate, and the relationship between the rotational speed and the change rate of the difference. Characteristic vehicle heat pump type air conditioner. 4. The heat pump type air conditioner for a vehicle according to claim 3, wherein when the difference between the vehicle interior temperature and the target temperature is less than a predetermined value, PID control of the difference between the vehicle interior temperature and the target temperature is performed.