JPS629052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning control device suitable mainly for automobiles that integrally controls the temperature and air volume (air volume per unit time) of air blown into an air-conditioned area.

Conventional air conditioning control devices are configured to either keep the volume of blown air constant and vary the temperature, or to vary the volume and temperature of the air depending on the difference from the actual set temperature. Therefore, with conventional devices, it has not been possible to realize comfortable air conditioning depending on the season and day and night.

The present invention is designed to adjust to environmental conditions such as season, day and night, by determining the blowout air temperature after preferentially determining the blowout air volume mainly according to the outside air temperature and also according to the heat exchange capacity of the air conditioning function section. The purpose of this is to realize air conditioning control that changes the air volume and temperature accordingly.

Therefore, in order to achieve the above object, the present invention, as shown in FIG. 6, includes an air volume adjusting means provided in an air passageway for introducing conditioned air into the vehicle interior and adjusting the amount of air introduced; A heat exchanger disposed in a passageway for exchanging heat with air; a temperature adjustment means for adjusting the temperature adjustment effect of the air by the heat exchanger; and an outside air temperature detection means for detecting outside air temperature outside the passenger compartment. , heat exchange capacity detection means for detecting the heat exchange capacity of the heat exchanger that varies according to the outside temperature; based on the determined heat exchange capacity and the outside temperature detected by the outside temperature detection means, Air volume adjustment amount control means that determines the amount of air introduced into the vehicle interior and outputs the adjustment amount of the air volume adjustment means to obtain this amount of air introduction; and Temperature setting means that sets a target temperature within the vehicle interior. , room temperature detection means for detecting the actual temperature in the vehicle interior; necessary heat amount determination means for determining the necessary amount of heat to be released into the vehicle interior based on the target temperature and the vehicle interior temperature; and this necessary heat amount determination. and a temperature adjustment amount control means for outputting the temperature adjustment amount of the temperature adjustment means based on the required heat amount and the blown air volume respectively determined by the air flow adjustment amount control means.

The present invention will be described below with reference to embodiments shown in the accompanying drawings. This embodiment is an example in which the present invention is applied to a generally known automobile air conditioner using a cold air/warm air mixing method. An outside air suction port 1a for introducing outside air and an inside air suction port 1b for circulating inside air are provided on the upstream side of the air conditioner 1. Both suction ports are opened and closed by an inside and outside air damper 2. In the ventilation duct 1, toward the downstream side, there are a blower motor 3, an evaporator 4 forming part of the cooling cycle cc, a heater core 5 forming a part of the cooling water cycle HC of the engine EG, and the air passing through the heater core 5. Temperature control dampers (A/M dampers) 7 are arranged in order to adjust the ratio to the air passing through the bypass passage 6. At the most downstream part of the ventilation duct 1,
The temperature-controlled air inside the duct is transported to the upper part of the vehicle interior.
Upper and lower air outlets 1c and 1d for blowing air are provided at the lower part, and both air outlets are opened and closed by an air outlet damper 8.

In order to perform temperature control and various operation mode controls, the control device 10 receives various information signals, executes processing based on a preset control program, and operates the air conditioning function sections 1 to 8 described above. It commands electrically.

As a means for inputting various information signals to the control device 10, an inside temperature sensor 21 including a heat-sensitive resistor that generates an analog voltage signal Tr' corresponding to the temperature inside the vehicle interior, and an analog voltage signal corresponding to the temperature outside the vehicle interior.
Outside temperature sensor 2 including a heat-sensitive resistor that produces Tam′
2. Temperature setter 23 that includes a potentiometer that generates an analog voltage signal Tset' that corresponds to the set temperature (set position), and an opening sensor that includes a potentiometer that generates an analog voltage signal Ar' that corresponds to the opening degree of the temperature control damper 7. 24, cold air sensor 25 including a heat-sensitive resistor that generates an analog voltage signal Tc' corresponding to the air temperature near the downstream side of the cooler core 4, cooling water cycle
Water temperature sensor 2 that includes a heat-sensitive resistor that generates an analog voltage signal Tw′ according to the temperature of the cooling water in the HC piping
6, and a switch panel 11 that generates on/off signals by operating a group of switches such as operation, stop, and operation mode selection.

In addition, the engine EG is used as a means for operating functional elements according to electrical commands from the control device 10.
an electromagnetic clutch 31 that cuts off and continues the driving force from the cooling cycle cc to the cooling cycle cc; an electromagnetic valve 32 that closes the cooling water circulation path to the heater core 5 in the heating cycle HC;
and negative pressure actuators 33, 34, 35 controlled by electromagnetic valves that use engine negative pressure to open and close the internal and external air damper 2, temperature control damper 7, and outlet damper 8.
is provided. The display panel 12 displays the operating status of the air conditioner and the control device based on the output signal of the control device 10.

When the ignition switch 13 of the vehicle is turned on, the control device 10 is supplied with power from the vehicle battery 14 and becomes ready for operation. As shown in FIG. 2, the control device 10a includes a digital computer (microcomputer) 10a that performs information processing based on a preset control program, and analog input means 21, 22, 23, 24, 25, and 26. An analog input interface 10b that selectively converts voltage signals from analog to digital and inputs them to the computer 10a; a digital input interface 10c that formats the on/off signals of each switch from the switch panel 11 and inputs them to the computer 10a; A power amplifier circuit 10d that amplifies the operation command signals of the functional elements 31 to 35 output from the computer 10a, a clock generation circuit 10f for blower information processing, an interface 10e for controlling the rotational speed of the motor 3, a constant voltage circuit, and an ignition circuit. The computer 10a is comprised of an initialization circuit (none of which is shown) that starts the operation of the computer 10a immediately after the switch 13 is turned on.

As shown in FIG. 3, the rotational speed control interface 10e includes a latch circuit 41 that latches a binary signal 41a representing rotational speed data in synchronization with a timing signal 41b, and a latch circuit 41 that latches a binary signal 41a representing rotational speed data in synchronization with a timing signal 41b. Digital-analog conversion circuit (A/D conversion circuit) 4 converting into voltage signal 42a
2, and a triangular wave voltage signal 4 with a constant frequency and constant amplitude.
3a, and both voltage signals 42.
a, 43a to obtain a pulse train 44a with a constant frequency and a duty ratio proportional to the magnitude of the analog voltage signal 42a, and an amplifier circuit 45 which amplifies this pulse train 44a and applies it to the blower motor 3. consists of blower motor 3
The rotation speed is controlled by controlling the duty ratio of the energizing current.

Then, the control device 10 determines the temperature and air volume of the air blown into the vehicle interior from the air conditioning function section through arithmetic processing based on the control program of the computer 10a, and determines the rotational speed of the blower motor 3 and the air mix damper 7. Command and control the opening degree. Further, although detailed explanation will not be given, switching control of the inside/outside air switching damper 2 and the outlet switching damper 8, display control of the inside air temperature on the display panel 12, etc. are also performed.

FIG. 4 shows the flow of the control program of the computer 10a, and the apparatus is operated according to this control program which is repeated at a cycle of several tens of milliseconds.

When the ignition switch 13 is turned on, power supply to the electrical control system shown in FIG. 2 is started, and the computer 10a sets the arithmetic processing to an initial state in step 101 in response to a timing signal from an initialization circuit (not shown). At this time, data indicating the rotation speed of 0 is given to the interface 10e so that the rotation speed of the blower motor 3 becomes 0. Next, the on states of various switches on the switch panel 11 are inputted via the interface 10c. First, it is determined in determination step 102 whether the operation switch of the air conditioner is turned on, and if YES, the calculation process is branched to activation step 103. In the starting step 103, the electromagnetic clutch 31 is activated via the amplifier circuit 10d.
An operation command (energizing current) is given to the solenoid valve 32, and the heat exchangers (cooler core 3, heater core 5) start exchanging heat.

Next, in a data input step 104, the analog voltage signals Tr', Tam', Tset', Tc',
Tw', Ar' are transmitted via the interface 106 to digital data Tr, Tam, Tset, Tc, respectively.
Input as Tw, Ar. Next, it is checked in judgment step 10 whether the outside air temperature Tam is higher than a first set value, for example, 25 (°C), and if it is low (No), it is checked in step 106 and then a second set value, for example, 15 (°C), in judgment step 107. ℃), and eventually the outside temperature
It is determined at which stage Tam is classified into the first set value and the second set value. Outside temperature Tam
If the temperature is higher than 25°C, proceed to step 108. In this case, it is generally a high temperature environment from spring to autumn, but in step 108, an increase WK for increasing the air volume according to the outside temperature Tam is calculated. It is generally said that in high temperature environments, it is preferable to increase the air volume to give a feeling of cooling ^air . /h) is determined by the increase Wk. Increase Wk when higher than 35 (℃)
is fixed at 50 (m ³ /h). Next step 10
9, a proportionality coefficient kw that changes the air volume according to the heat exchange capacity is calculated. Since the surface temperature of the cooler core 3 gradually decreases after the electromagnetic clutch 31 is activated, the heat exchange capacity (cooling capacity) is insufficient for a while after the operation switch is turned on. Furthermore, when the outside air temperature is abnormally high or when the engine speed is low, the heat exchange capacity becomes insufficient and it is not possible to blow sufficiently low-temperature air into the passenger compartment. In such a case, the present invention compensates for the feeling of cooling by increasing the air volume. In this embodiment, the heat exchange capacity is monitored based on the air temperature after passing through the cooler core 3 (cold air temperature) Tc detected by the cooling sensor 25, and the coefficient Kw is increased as the cold air temperature Tc becomes higher than 5 (°C). let Note that when the cold air temperature is extremely high, hot air is blown out, giving a feeling of discomfort, so the coefficient Kw is made small when the temperature is, for example, 30°C or higher.

When the outside temperature Tam is below 25 (℃),
In step 106, the air volume increase Wk is set to 0, and when it is higher than 15 (°C), step 1
10, the proportionality coefficient Kw is calculated. 15 (℃)
A medium-temperature environment of 25 to 25 degrees Celsius is generally said to be the most comfortable temperature environment during spring and autumn, and in this embodiment, the proportionality coefficient Kw is only slightly changed in step 110 in accordance with the outside air temperature Tam. In low-temperature environments, generally from autumn to spring, when the outside air temperature is below 15 (°C), it is undesirable to blow out a large amount of cold air, and the present invention solves this problem by reducing the air volume in such cases. Avoid giving pleasure. In step 111 of this embodiment, a proportionality coefficient Kw is calculated according to the heat exchange capacity (heating capacity). That is, the temperature Tw of the cooling water flowing into the heater core 5 is detected by the water temperature sensor 26, and as the temperature Tw of the cooling water becomes lower than 60 (° C.), the proportionality coefficient Kw is proportionally decreased.

In steps 112 and 113, in order to stably control the cabin temperature, a basic air volume W _B having an air volume slope corresponding to the difference ΔT between the inside air temperature Tr and the set temperature Tset is calculated. This basic air volume W _B is represented by the air volume curve B in Figure 5, and is based on the outside air temperature.
It is set as the standard air volume when Tam is 25 (℃). In this example, the difference △T is ±2
(℃) or less, the maximum air volume Wmax is 180 (m ³ /h), and when it exceeds ±5 (℃), the maximum air volume Wmax = 350 (m ³ /h), ±2
(°C) to ±5 (°C).

Next, in step 114, the air volume W is determined based on the basic air volume W _B , the proportionality coefficient Kw, and the increased amount Wk. It is checked in a determination step 115 whether the determined air volume W exceeds the maximum capacity of the blower motor 3, that is, Wmax, and if it does, the air volume Wmax is fixed at the maximum air volume Wmax in a step 116.

Next, in steps 117 and 118, the temperature Tao of the blown air (corresponding to the opening degree of the air mix damper 7) is determined. First, in step 117, the necessary amount of heat Q to be blown into the passenger compartment is calculated according to control parameters such as the inside air temperature Tr, the set temperature Tset, and the outside air temperature Tam. This calculation is performed using the following equation, assuming that the air volume W is Wo.

Taoo=Kset・Tset−Kam・Tam −Kr・Tr+C Q=Kq・Wo (Taoo−Tr) However, Kset, Kam, Kr, Kq, C are constants,
Taoo is the temperature of the outlet air with respect to the tentative air volume Wo. Subsequently, in step 118, the blown air temperature Tao necessary to obtain the amount of heat Q by the determined air volume W is calculated by proportional calculation of Tao=Q/Kq·W+Tr. In steps 119 to 122, it is checked whether the calculated temperature Tao is within the capacity of the heat exchanger, and if it is higher than the maximum heating capacity of the heater core 5, for example 70 (℃).
It is fixed at 70 (°C), and when the cooling capacity of the cooler core is lower than 3 (°C), for example, it is fixed at 3 (°C).

In the next step 123, the moving direction of the air mix damper 7 is determined while referring to the damper opening degree Ar so that the blown air at the calculated and determined temperature Tao is generated on the downstream side of the ventilation duct 1, and the amplifier circuit An operation command (energizing current) is given to the negative pressure actuator 34 via 10d. Next step 124
In this case, the data indicating the air volume W is interface 1.
0e, and the rotational speed of the blower motor 3 is adjusted to produce the air volume W by the output pulse of the interface 10e. Following step 124,
The operation control of other air conditioning functions, temperature display, etc. are processed according to the control program based on the switch on the switch panel 11, and the process returns to judgment step 1.
02 and repeats the above-mentioned arithmetic processing. When the operation switch is released, stop step 1
25, a command signal is sent to the amplifier circuit 10d to stop the electromagnetic clutch 31 and electromagnetic valve 32. Further, data for setting the rotational speed to 0 is sent to the interface 10e, and the blower motor 3 is stopped.
Note that when the ignition switch 13 is opened, the electric control system including the computer 10a loses all control functions and stops air conditioning control.

By repeatedly executing the above-mentioned arithmetic processing, the cabin temperature (inside air temperature Tr) is set to the set temperature.
The amount of heat Q of the blown air is adjusted so as to approach Tset. The amount of heat Q is the amount of air blown out W and the temperature Tao
In particular, the air volume W is preferentially determined according to control parameters including the outside air temperature Tao and heat exchange capacity (cooling capacity Tc, heating capacity Tw),
The temperature Tao is determined accordingly. The air volume W is
When the outside air temperature Tao exceeds 25 (°C), the air flow rate is increased accordingly and determined according to the air volume curve shown in FIG. _5B1 . Temperature that further indicates cooling capacity
When Tc is high, the air volume W is further increased accordingly and is determined according to the curve shown in FIG. _5B2 . When the outside air temperature Tam becomes 25 (°C) or less, the adjustment of the air volume W according to the cooling capacity (Tc) is stopped. Alternatively, if the outside air temperature Tam is between 15 (℃) and 25 (℃), the temperature will decrease as the outside temperature Tam decreases, and if the outside air temperature Tam is 15 (℃) or less, the temperature Tw, which indicates the heating capacity, will decrease. If no, the air volume W is proportionally reduced and determined according to a curve as shown in FIG. 5C.

In this way, the air volume W is calculated based on the basic air volume W _B , and the outside air temperature Tam and the outside air temperature Tam are 25
By changing the heat exchange capacity (Tc, Tw) when the temperature is above (℃) or below 15 (℃), it gives a feeling of cool breeze in a high temperature environment and supplements the feeling of air conditioning, and also provides a feeling of heating in a low temperature environment. It is possible to prevent a detrimental increase in air volume and perform more comfortable air conditioning control in all seasons, day and night.

Note that the present invention is not limited to the above-mentioned embodiment, and can be implemented in other embodiments.

For example, FIG. 4 shows the method of the present invention shown in FIGS.
This shows an example of a control program executed by the air conditioning control device shown in the figure, and this control program can be modified as necessary. The function calculations in steps 108, 109, 110, and 111 follow the programmed calculation formulas as well as the data recorded in the memory (ROM) in matrix format.
Wk and Ww may be read as outside temperature data Tam, and heat exchange capacity data Tc and Tw may be read as addresses. Further, steps 105 to 114 may be replaced with a series of calculation formulas.

The air flow rate determination, heat amount determination, and temperature determination may be performed by employing an appropriate calculation formula instead of the above-mentioned calculation formula. Here, the amount of solar radiation, the amount of outside air, etc. may be added as control parameters in the calculation. Further, it goes without saying that the upper and lower limits of the air volume slope, maximum air volume, and heat exchange capacity are selected depending on the device.

In addition to a digital computer using a control program set in software, the method of the present invention may be implemented by performing analog or digital calculations in hardware.

The heat exchange capacity on the cooling side and the heating side is measured by a cold air sensor 25 and a water temperature sensor 26, respectively.In addition, one outlet temperature sensor is provided to measure the air temperature near the outlet in the ventilation duct 1, and the measured temperature is Detection may also be performed by

To adjust the weighting of the heat exchange capacity according to the outside air temperature, as mentioned above, the value of the outside air temperature is compared with the set value, and the heat exchange capacity is included in the control parameters according to the result. The control parameter may be obtained by multiplying a parameter indicating the heat exchange capacity by a proportionality coefficient set to vary depending on the heat exchange capacity.

As described above, in the present invention, it is possible to realize air conditioning control in which the distribution of air volume and temperature changes according to the environmental conditions such as season, day and night, and according to the heat exchange capacity, thereby achieving more comfortable air conditioning control. It has the excellent effect of being able to

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an example of an air conditioning control device to which the device of the present invention is applied, FIG. 2 is a block diagram showing the electrical control system of the device shown in FIG. 1, and FIG. FIG. 4 is a flowchart showing an example of a control program for operating the device according to the present invention, and FIG. 5 is an explanation of the operation, especially the determination of air volume. FIG. 6 is a temperature deviation ΔT vs. air volume W characteristic diagram for explaining the present invention, and FIG. 6 is a block diagram showing the configuration of the present invention. 3... Blower motor for air volume adjustment, 4, 5... Heat exchanger, 7... Air mix damper for temperature adjustment,
10...Control device, 21...Inside temperature sensor, 22
...Outside temperature sensor, 23...Temperature setting device.

Claims (1)

[Scope of Claims] 1. An air volume adjusting means provided in an air passage that introduces conditioned air into the vehicle interior and adjusting the amount of air introduced; and an air volume adjusting means provided in the air passage and performing heat exchange of the air. a heat exchanger; a temperature adjustment means for adjusting the air temperature adjustment effect of the heat exchanger; an outside temperature detection means for detecting outside air temperature outside the vehicle interior; and the heat exchanger that changes in accordance with the outside air temperature. a heat exchange capacity detection means for detecting a heat exchange capacity of the vehicle; determining an amount of air introduced into the vehicle interior based on the determined heat exchange capacity and the outside temperature detected by the outside temperature detection means; Air volume adjustment amount control means that outputs the adjustment amount of the air volume adjustment means to obtain this air introduction amount; Temperature setting means that sets the target temperature in the vehicle interior; Room temperature detection that detects the actual temperature in the vehicle interior. a necessary amount of heat determining means for determining the necessary amount of heat to be emitted into the vehicle interior based on the target temperature and the vehicle interior temperature; and a necessary amount of heat determined by the necessary amount of heat determining means and the air volume adjustment amount control means, respectively. An air conditioning control device for a vehicle, comprising: temperature adjustment amount control means for outputting a temperature adjustment amount of the temperature adjustment means based on the amount of heat and the amount of air blown.