JPH10258631A - Air-conditioning control device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control heating temperature favourable by detecting an indoor heat load, computing a necessary heat load for heating in accordance with this detected value and set temperature and setting target temperature of hot water in accordance with this-computed heat load. SOLUTION: A heat load in a car room is detected by an indoor load detector 31. Thereafter, a heating required heat load required for heating is computed in accordance with the detected value and a temperature set value set at a setting temperature input part 21 and target temperature which is controlling temperature of hot water is set in accordance with this value on a hot water temperature control device 23. That is, the hot water temperature control device 23 controls temperature of hot water so that this computed required heat load is given by hot water. The hot water temperature control device 23 controls a heater control part 15b of a hot water heater 15 so that temperature of hot water becomes target temperature while monitoring temperature of hot water in accordance with a detected value from a water temperature sensor 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning control device for air-conditioning the interior of an electric or hybrid electric vehicle, and more particularly to an air-conditioning control device using a hot-water type heating device.

[0002]

2. Description of the Related Art As an air-conditioning control device for air-conditioning the interior of an automobile, there is known an air-conditioning control device using a hot-water heating device for heating using hot water. As shown in FIG. 8, the hot water heating apparatus includes a hot water heat exchanger 11 that exchanges heat between hot water and air to generate hot air, a circulation pump 13 that circulates hot water, and a hot water heating device that heats hot water. And a vessel 15. The air-conditioning control device further includes a water temperature sensor 17 for detecting the temperature of the hot water, a switch SW for activating the hot water heating device, a hot water temperature control device 23 for controlling the hot water heating device, in addition to the hot water heating device, Blower 2 for generating hot air flow
7 is provided. The hot water temperature controller 23 controls the temperature of hot water, that is, the temperature of hot air, by controlling the hot water heater 15 based on a predetermined target temperature.

In the air-conditioning control device configured as described above, the occupant turns on the switch SW to activate the hot water type heating device. At this time, the temperature of the hot water is heated by the hot water heater 15 so as to reach a constant target temperature irrespective of the temperature in the vehicle interior. For example, as shown in FIG.
It is heated to a target temperature of 70 ° C. The heated hot water is circulated in the circulation path 25 by the circulation pump 13, and heat-exchanges with the air flowing in the air conditioning duct 29 in the hot water heat exchanger 11, so that the heated hot water flows in the air conditioning duct 29. Is generated, sent out into the vehicle interior, and heated.

[0004]

However, the target temperature, which is the control target of hot water, is set on the assumption that the outside air temperature is low in winter or the like, that is, a case where the heating capacity is extremely required. Further, as described above, the target temperature of the hot water in the air conditioning control device is set to a predetermined temperature regardless of the temperature in the vehicle interior. For this reason, hot water is used even in the middle of spring or autumn, when the temperature in the cabin is high, and when heating is used in a case where heating capacity is not so required,
The temperature is controlled to be high as in the case where the heating capacity is very required. Therefore, during heating when the heating capacity does not require much, unnecessary power is consumed by heating the hot air unnecessarily to a high temperature, and high-temperature hot air is blown out. There was a problem of feeling uncomfortable.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an electric vehicle or hybrid electric vehicle which suitably controls a heating temperature based on a state of a heat load in a passenger compartment. An object of the present invention is to provide a vehicle air conditioning control device suitable for a vehicle.

[0006]

According to a first aspect of the present invention, there is provided a vehicle air-conditioning control device having hot water heating means for heating hot water to a target temperature, and exchanging heat between the heated hot water and air. In an air conditioning control device including a hot water heating device that generates hot air used for heating, a set temperature input unit that inputs a temperature set value of the hot air, and a hot water temperature detection unit that detects a temperature of the hot water, A heat load detecting means for detecting a heat load, which is the amount of heat in the vehicle cabin; and a heat load required for heating is calculated from the heat load detected by the heat load detecting means and the temperature set value. And a hot water temperature control means for setting the target temperature based on the heat load and controlling the hot water heating means based on the target temperature and the temperature of the hot water detected by the hot water temperature detection means.

In the first air conditioning control apparatus for a vehicle, the heat load detecting means includes an outside air temperature detecting means for detecting a temperature of the outside air, a vehicle interior temperature detecting means for detecting a temperature in the vehicle interior, A solar radiation detecting means for detecting the amount of solar radiation to be irradiated.

[0008] In the first vehicle air conditioning control device, the control means may change a voltage supplied to the hot water heating means according to the target temperature.

In the first vehicle air conditioning control device, the control means compares the temperature of the hot water detected by the hot water temperature detecting means with the target temperature, and determines that the temperature of the hot water is higher than the target temperature. When the temperature of the hot water is lower than the target temperature, the hot water heating unit may be stopped, and when the temperature of the hot water is lower than the target temperature.

[0010] A second automotive air-conditioning control device according to the present invention has hot water heating means for heating hot water to a target temperature, and exchanges heat between the heated hot water and air to generate hot air used for heating. An air-conditioning control device provided with a hot-water heating device that generates the temperature of the hot water, a hot-water temperature detecting means for detecting the temperature of the hot water, an outside-air temperature detecting means for detecting the temperature of the outside air, and an outside air detected by the outside-air temperature detecting means. A hot water temperature control means for controlling the hot water heating means based on the target temperature and the hot water temperature detected by the hot water temperature detection means.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a vehicle air-conditioning control apparatus according to an embodiment of the present invention.

Embodiment 1 FIG. 1 is a vehicle air-conditioning control device according to the first embodiment (hereinafter, referred to as an “air-conditioning control device”).
It is a block diagram of. The air-conditioning control device of the present embodiment is different from the conventional air-conditioning control device shown in FIG. 8 in that a set temperature input unit 21 for setting the temperature of hot air and an indoor heat load are further detected for a hot water temperature control device 23. An indoor heat load detector 31 is provided. Here, the hot water heater 15
Has a heater section 15a that generates heat when energized, and a heater control section 15b that controls energization to the heater section 15a. Hereinafter, the operation of the air conditioning control device will be described in detail.

In the air-conditioning control device according to the present embodiment, first, the heat load in the vehicle compartment is detected by the indoor heat load detector 31.
Here, the heat load is a heat amount. For example, the heat load in the vehicle interior is a value obtained by converting the temperature in the vehicle interior into a heat amount. Next, the hot water temperature control device 23 calculates a heating load required for heating, which is a heating load necessary for heating, based on the detection value from the indoor heat load detector 31 and the temperature set value set by the set temperature input unit 21. I do. For example, the higher the cabin temperature and the outside air temperature,
Also, the heat load in the vehicle compartment increases as the amount of solar radiation increases, and the heat load required for heating is calculated by calculating the difference between the heat load based on the temperature set value and the heat load in the vehicle compartment.

Therefore, if the difference between the heat load in the vehicle compartment and the heat load based on the temperature set value is small, the required heat load is small, and if the difference is large, the required heat load is large. The hot water temperature controller 23 sets a target temperature, which is a control temperature of the hot water, based on the value of the heat load required for heating.
That is, the hot water temperature control device 23 controls the temperature of the hot water so that the calculated required heat load is given by the hot water. FIG. 2 shows the relationship between the heating load required for heating and the target temperature of the hot water. As shown in FIG.
Sets the target temperature of the hot water higher as the heating load required for heating increases. The hot water temperature control device 23 includes a water temperature sensor 17
The heater controller 15b of the hot water heater 15 is controlled such that the temperature of the hot water becomes the target temperature while monitoring the temperature of the hot water based on the detected value from the control unit. As described above, the air conditioning control device of the present embodiment detects the indoor heat load, calculates the required heat load from the heat load and the temperature set value, and calculates the target temperature of the hot water based on the required heat load. In order to set the temperature, the hot water temperature is controlled to a suitable temperature according to the temperature condition in the vehicle compartment, and thereby comfortable heating for the occupant is performed. Further, since the temperature of the hot water is suitably controlled, wasteful power consumption can be reduced.

FIG. 3 shows an example of the thermal load detector 31. Here, an indoor temperature sensor 31a for detecting the temperature of the vehicle interior, a solar radiation sensor 31b for detecting the solar radiation, and an outdoor air temperature sensor 31c for detecting the temperature of the outdoor air are provided by the heat load detector 31.
It consists of: Therefore, the hot water temperature control device 23 of the air conditioning control device shown in FIG. 3 calculates the heat load required for heating from the vehicle interior temperature, the outside air temperature, the amount of solar radiation, and the temperature set value. For example, it is assumed that the higher the temperature in the vehicle interior and the temperature of the outside air, and the greater the amount of solar radiation, the greater the thermal load in the vehicle interior, and the difference between the thermal load in the vehicle interior and the thermal load based on the temperature set value is calculated. The required heat load for heating is thereby calculated.

FIG. 4 shows a heater section 15a of the hot water heater 15.
5 is a flowchart showing control of the voltage supplied to the power supply. In FIG. 4, first, a set temperature is input from the set temperature input unit 21 (S1), and a vehicle interior heat load is input from the vehicle interior heat load detector 31 (S2). The required heat load for heating is calculated from the set temperature and the heat load in the vehicle interior (S3). A target temperature T which is a control target temperature of the hot water based on the heating required heat load.
t is set (S4). At the same time, the hot water temperature Tw is input by the water temperature sensor 17 (S5). The target temperature Tt and the hot water temperature Tw are compared (S6), and the target temperature Tt is compared with the hot water temperature Tw.
If it is higher, the input voltage to the heater 15a is increased (S7). On the other hand, when the target temperature Tt is equal to the hot water temperature Tw, the input voltage to the heater 15a is held as it is (S8). Also, as a result of the comparison in step S6,
When the target temperature Tt is lower than the hot water temperature Tw, the heater unit 1
The input voltage of 5a is reduced (S9). As described above, by changing the voltage input to the heater unit 15a based on the heating load required for heating, the temperature of the hot water can be adjusted to a suitable temperature without controlling the energization / interruption of the input voltage to the heater unit 15a. Can control.

FIG. 5 shows a heater 15a of the hot water heater 15.
3 is another flowchart showing the control of the voltage supplied to the power supply. In FIG. 5, first, the set temperature is input from the set temperature input unit 21 (S11), and the indoor heat load is input by the indoor heat load detector 31 (S12). The required heat load for heating is calculated from the set temperature and the heat load in the vehicle compartment (S13).
A target temperature Tt, which is a control target temperature of the hot water, is set based on the required heating heat load (S14). Next, the hot water temperature Tw is input by the water temperature sensor 17 (S15). The hot water control temperature Tt and the hot water temperature Tw are compared (S16), and when the target temperature Tt is equal to or higher than the hot water temperature Tw, the hot water heater 15 is stopped (S17). As a result of the comparison in step S16, when the target temperature Tt is lower than the hot water temperature Tw, the hot water heater 15 is operated (S18). As described above, the application of the voltage input to the hot water heater 15 based on the temperature of the hot water /
Even if the cutoff is controlled, the temperature of the hot water can be controlled to a suitable temperature.

Embodiment 2 FIG. FIG. 6 shows a block diagram of an air conditioning control device according to the second embodiment. The air-conditioning control device according to the present embodiment is different from the conventional air-conditioning control device shown in FIG. 8 in that an outside air temperature sensor 31c for detecting the temperature of the outside air is provided as a heat load detection unit in the hot water temperature control device 23. . The hot water temperature control device 23 changes the target temperature of the hot water in the hot water heater 15 based on the detection value from the outside air temperature sensor 31c. FIG. 7 shows the relationship between the outside air temperature and the target temperature of the hot water at this time. That is, in the hot water temperature control device 23, the target temperature is set such that the target temperature of the hot water decreases as the outside air temperature increases. As described above, the temperature of the hot water is controlled to a suitable temperature in accordance with the temperature state outside the vehicle compartment, so that comfortable heating for the occupant is performed.
Further, since the temperature of the hot water is suitably controlled, wasteful power consumption can be reduced.

[0019]

According to the first air conditioning control apparatus of the present invention, the indoor heat load is detected, and the heat load required for heating is calculated based on the detected value and the set temperature. Since the target temperature of the hot water is set to a suitable temperature based on the load, power consumption can be reduced and comfortable heating according to the temperature state of the vehicle interior can be realized.

According to the second air conditioning control device of the present invention, the outside air temperature is detected, and the target temperature of the hot water is set to a suitable temperature based on the outside air temperature. Comfortable heating according to the temperature outside the vehicle compartment can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of an air conditioning control device according to a first embodiment.

FIG. 2 is a diagram showing a relationship between a heating load required for heating and a hot water control temperature in the air conditioning control device according to the first embodiment.

FIG. 3 is a block diagram of an air conditioning control device including a vehicle interior temperature detector, a solar radiation amount detector, and an outside air temperature detector for detecting an indoor heat load.

FIG. 4 is a flowchart showing first control of the hot water temperature control device.

FIG. 5 is a flowchart showing a second control of the hot water temperature control device.

FIG. 6 is a block diagram of an air conditioning control device according to a second embodiment.

FIG. 7 is a diagram illustrating a relationship between an outside air temperature and a hot water control temperature in the air conditioning control device according to the second embodiment.

FIG. 8 is a block diagram of a conventional air conditioning control device.

FIG. 9 is a diagram showing a temperature change of hot water in a conventional air conditioning control device.

[Explanation of symbols]

11 hot water heat exchanger 13 circulating pump 15
Hot water heater, 15a: heater section, 15b: heater control section, 17: water temperature sensor, 21: set temperature input section,
23 hot water temperature control device 25 circulation path 27
... blower, 29 ... ventilation duct, 31 ... indoor heat load detector, 31a ... indoor temperature sensor, 31b ... solar radiation sensor, 31c ... outside air temperature sensor, SW ... switch.

Claims (5)

[Claims] 1. An air-conditioning control having a hot water heating device for heating hot water to a target temperature, and a hot water heating device for generating hot air for heating by exchanging heat between the heated hot water and air. In the apparatus, a set temperature input unit for inputting a temperature set value of the hot air, a hot water temperature detecting unit for detecting a temperature of the hot water, a heat load detecting unit for detecting a heat load that is a heat amount in the vehicle compartment, A heat load required for heating is calculated from the heat load detected by the heat load detection means and the temperature set value, the target temperature is set based on the heat load required for heating, and the target temperature and the hot water temperature are set. An air-conditioning control device for a vehicle, further comprising: a hot water temperature control means for controlling the hot water heating means based on the temperature of the hot water detected by the detection means. 2. The air-conditioning control device according to claim 1, wherein the heat load detecting means detects an outside air temperature, a vehicle interior temperature detecting means detects a temperature of a vehicle interior, and a vehicle interior temperature detecting means. An air-conditioning control device for a vehicle, comprising: a solar radiation amount detecting unit configured to detect a solar radiation amount applied to a room. 3. The air-conditioning control device according to claim 1, wherein the control unit changes a voltage supplied to the hot water heating unit according to the target temperature. 4. The air conditioning control device according to claim 1, wherein the control unit compares the temperature of the hot water detected by the hot water temperature detection unit with the target temperature, and determines that the temperature of the hot water is the target temperature. In the above case, the hot water heating unit is stopped, and when the temperature of the hot water is lower than the target temperature, the hot water heating unit is activated. 5. An air-conditioning control comprising a hot water heating device for heating hot water to a target temperature, and a hot water heating device for generating hot air for heating by exchanging heat between the heated hot water and air. In the device, hot water temperature detecting means for detecting the temperature of the hot water, outside temperature detecting means for detecting the temperature of the outside air, and setting the target temperature based on the temperature of the outside air detected by the outside temperature detecting means, An air-conditioning control device for a vehicle, further comprising a hot water temperature control means for controlling the hot water heating means based on the target temperature and the temperature of the hot water detected by the hot water temperature detection means.