JPH0310922A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To improve comfortability of air conditioning by providing a cooling control door and a hot air flow control door on each cold air passage and each hot air passage, taking the place of an air mix door provided on each temperature control passage, and independently controlling the blow out air temperature and the blow-out speed at each blow-out passage. CONSTITUTION:In the duct casing 1 of an air conditioner, a circulating interior air suction port 1a, an outer air introducing port 1b, an upper part cold air passage 1c, an upper part hot air passage 1d, a lower part cold air passage 1e, a lower part hot air passage 1f, a differential duct 1g, a bent duct 1h, and a floor duct 1i are respectively provided. An upper part cold air control door 6 is at the upper part cold air passage 1c, an upper part hot air control door 7 is at the upper part hot air passage 1d, a lower part cold air control door 8 is at the lower part cold air passage 1e, and a lower part hot air control door 9 is at the lower part hot air passage 1f respectively provided. In operating the air conditioner, deviations between the control target values computed with a control circuit 33 and the actual blow-out temperature and the actual blow-out speed are searched, and actuators 13-16 driving respective control doors 6-9 are controlled against the deviations so as to be close to zero.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner for an automobile, and more particularly to an air conditioner for an automobile suitable for making the temperature and airflow distribution inside a car comfortable.

(Prior art) As an air conditioner for automobiles, the conventional
The one disclosed in Japanese Patent No. 364 is known.

According to this proposal, air mix doors provided in a plurality of temperature control passages are configured to independently adjust the temperature of the air blown out from the temperature control passages.

[Problem to be solved by the invention]

According to the above-mentioned conventional technology, there is no arrangement for air volume distribution to each outlet, and when one air mix door operates, if the position of the other air mix door is fixed, the cold air passage and the hot air passage are divided. A phenomenon occurs in which the blowout temperature changes because the ratio of inflowing air changes. Therefore, when one air mix door is activated, the other air mix door must also be activated in order to maintain the blowout temperature downstream of the other air mix door.
As a result, there was a problem in that the distribution of the amount of blowing air changed. An object of the present invention is to enable independent adjustment of the air temperature and air volume blown out from a plurality of air outlets, thereby optimizing the temperature and airflow distribution inside the vehicle.

[Means to solve the problem]

In order to achieve the above object, each pair of cold air passage and hot air passage is provided with a cold air control door and a hot air control door, respectively.
In addition, a temperature detector and a wind speed detector are installed at each outlet to be controlled.

[Effect]

The blowout temperature and blowout air speed detected by the temperature detector and wind speed detector installed in the temperature control passageway connected to the outlet where the cold air passageway and the hot air passageway meet are fed back and adjusted to the target value (set value). The mixing ratio of cold air volume and hot air volume, and the mixed air volume are adjusted using the cold air control door and the hot air control door.

As a result, the temperature and speed (air volume) of the air blown out from each outlet can be adjusted independently, without being influenced by the adjustment results of other outlets.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automotive air conditioner (hereinafter referred to as an air conditioner) according to the present invention will be described below with reference to the drawings. 1st
An embodiment of the present invention is shown in the figure. 1 is a duct casing that encloses the components of the air conditioner, 2 is a blower motor, 3 is an evaporator, 4 is a heater core, 5 is an outside air introduction door, 6 is an upper cold air control door, 7 is a lower hot air control door, 8 is a 9 is a lower cold air control door, 9 is a lower hot air control door, and 10 is a vent and differential distribution door.

11 is a floor ventilation door, 12 is an outside air introduction door control actuator, 13 is an upper cold air control door actuator, 14 is an upper hot air control door actuator, 15 is a lower cold air control door actuator, and 16 is a lower hot air control door. actuator.

17 is a vent/differential air distribution door actuator, and 18 is a floor air distribution door actuator. In addition, 1a is an inside air circulation inlet, 1b is an outside air introduction port, 1c is an upper temperature control cold air bypass passage (hereinafter referred to as an upper cold air passage), and 1d is an upper temperature control hot air introduction passage (hereinafter referred to as an upper hot air passage). ), 1
Reference numeral 1 denotes a cold air bypass passage for lower temperature control (hereinafter referred to as a lower cold air passage).

11 is a hot air introduction passage for lower temperature control (hereinafter referred to as a lower hot air passage), 1g is a def duct, 1h is a vent duct, 11
are floor ducts, each of which is equipped with a discharge port. Next, the configuration of a control device for organically controlling an air conditioner according to this embodiment will be explained.

19 is a differential outlet temperature sensor, 20 is a differential outlet air speed sensor,
21 is a vent air temperature sensor, 22 is a vent air speed sensor, and 23 is a floor air temperature sensor.

24 is a floor blowout wind speed sensor, 26 is an upper room temperature sensor,
27 is a lower room temperature sensor, 27 is an outside air sensor.

28 is a solar radiation sensor, 29 is a temperature setting device, 30 is a mode setting device, a stop switch 30a, an auto switch 30
b, a differential switch 30c, and the like. Further, 31 is a fan rotation control circuit, 32 is a compressor magnetic clutch, 33 is a control circuit including a microcomputer, 34
is an A/D converter that converts analog signals into digital signals, and includes outlet temperature sensors 19, 21, 23, and wind speed sensor 20.
°22.24, room temperature sensor 25, 26, outside air sensor 26
, solar radiation sensor 27, are sequentially converted into digital signals. The control circuit 32 includes a single-chip microcomputer that executes software digital arithmetic processing according to a predetermined air conditioning control program, constitutes an arithmetic processing means, and operates at several megahertz (MHz).
) crystal oscillator 35. is connected to the power source, and is activated by receiving a stabilized voltage from a stabilized power supply circuit (not shown) that generates a stabilized voltage based on the power supply from the on-vehicle battery. Then, through the calculation processing of the control circuit 32, a command signal for operating the upper cold air control door 6 and the upper hot air control door 7 so that the upper air blowing temperature and wind speed become the preset target air blowing temperature and wind speed, and the lower blowing air temperature are generated. A command signal is generated to operate the lower cold air control door 8 and the lower hot air control door 9 so that the air flow reaches the preset target blowout temperature and air speed. The control circuit 33 including this microcomputer is a read only memory (Read only memory) that stores an air conditioning control program that defines the calculation procedure for generating the command signal.
OM ) and a central processing unit (
Central Processing Unit:c
pu'''f and a memory that temporarily stores various data related to the arithmetic processing of this CPU and can be read by the CPU.
ry: RAM), the main parts are a clock generation section that generates reference clock pulses for the above various calculations with a crystal oscillator 35, and an input/output (Ilo) circuit section that adjusts input and output of various signals. One-chip large-scale integrated circuit (
It is manufactured by LSI. Next, the operation of this embodiment will be explained. The actuator 12 operates the outside air introduction door 5 to determine whether the air to be introduced into the air conditioner is outside or inside, the blower motor 2 blows the air, the evaporator 3 dehumidifies and cools it, and then the upper cold air control door 6 opens the upper cold air passage 1c. The upper hot air control door 7 adjusts the amount of air passing through the upper hot air passage 1d, and the temperature and amount of air blown out from the upper part is adjusted. The air and the amount of air passing through the lower hot air passage 1f are adjusted by the lower hot air control door 9, and the temperature and amount of air blown out from the lower part are controlled. The air is blown into the car from the vent outlet of II, and the lower air is blown out of the floor outlet of II to make the inside of the car comfortable.

Figure 2 shows the air flow in each mode of air mIa according to the present invention, and (a) air conditioner mode, (b) pie level mode, and (c) heater mode are automatically switched according to the level of each blowout temperature. This is an auto mode, and (d) differential mode is a manual mode that is arbitrarily selected by the occupant. Figure 3 shows a control circuit 33 based on the air conditioning control program.
2 is a calculation flowchart showing calculation processing of FIG. First, the arithmetic processing by this control circuit 33 will be explained. Now, in a car equipped with this device, when the vehicle starts driving, the microcomputer in the control circuit 33 is activated by receiving the stabilized voltage from the stabilized power supply circuit, and the microcomputer in the control circuit 33 is activated.
The calculation process of the air conditioning control program is executed at a cycle of 5ec. That is, the calculation process of the air conditioning program is started from the start step 101 in FIG. 3, and the signal input step 1 is started.
Proceed to 02. In this signal input step, upper room temperature sensor 25, lower room temperature sensor 26. Outside air sensor 27, solar radiation sensor 28, outlet temperature sensors 19, 21, 23, wind speed sensor 2
0, 22, 24. Then, each signal passed through the A/D converter 34 is memorized and the process proceeds to the next target outlet temperature calculation and target outlet air speed calculation step 103. The control target value and the outlet temperature sensor are calculated and determined by the 0th order 103 target value calculation step, which calculates the target outlet temperature and the target outlet air velocity based on the input signals of each sensor input and stored.

Then, the deviation between the actual air outlet temperature detected by the wind speed sensor and the actual air outlet air speed is calculated.Next, the process proceeds to step 105 of calculating a control signal, and the cold air control door actuator is operated so that the deviation calculated in 104 approaches zero. 6.8 and a control signal for operating the hot air control door actuator 7.9. In the next step 106, if the target outlet temperature is out of the specified value range, a determination is made to forcibly fix the outlet, and the process proceeds to the first step 107.

Each actuator is actuated based on the calculation results in steps 105 and 106. The above calculation flowchart shows a specific example of the calculations of the sixth order 103, 104, 105 and 1 judgment that can be applied to the temperature control and speed control of the air blowing out from each outlet.

First, the target outlet temperature is determined by the outside temperature, the amount of solar radiation, and the amount of sunlight.

It is determined by the temperature inside the vehicle and the thermal characteristics of the vehicle to which it is applied. Now, if the upper target outlet temperature is Tdou and the lower target outlet temperature is Tdo Q, Tdou and TdoΩ are determined by the following equations (1) and (2).

Tdo Q = f * (T a ) + CΔTram
However, considering ΔT Ru = T sou T )tuΔTR:
Tso - THt ... (2) ... (3) ... (4) TsOu = T S (T a -25)
'=(5)Tsoz=Ts-(Ta
25) ``'(6) Here, f(a): Target air temperature relative to outside air temperature ZC: Solar radiation amount Tsou: Upper vehicle interior control target temperature Tso*: Lower vehicle interior control target temperature A, B, C, D are vehicle The correction coefficient is shown below.

A specific example of the target outlet temperature determined as described above is shown in FIG. To control the blowout temperature, the target blowout temperature Tdou, T
The difference between do Q and Tdu and Td12 detected by the outlet temperature sensors 19, 21.23, ΔTdu, and ΔTdQ
The upper cold air door control actuator 13
Then, the upper hot air door control actuator 14, the lower cold air door control actuator 15, and the lower hot air door control actuator 16 are operated. Next, a method of controlling the blowing wind speed will be explained. The principle of the wind speed sensor used in an air conditioner according to the present invention is that when wind is applied to a heating element, the temperature of the developing body decreases, and the wind speed is determined from the amount of temperature fluctuation.

The heat transfer coefficient α of the thermistor during restrained convection is as follows (7
) can be expressed by the formula.

a=avb...(7)
On the other hand, when the temperature is 04 Ta and the temperature of the thermistor for wind speed measurement is Tth, the amount of heat released by the thermistor is expressed by the following equation.

Q=Eα(Tvh Tt)...
-(8) Also, since all of the power consumption of the thermistor is converted into heat, Q can be expressed by the following equation.

Q = Vth I −
(9) Therefore, from equations (7), (Ill), and (9), the wind speed around the outlet wind speed sensor can be determined from the following equation.

In the case of wind speed control, the state of the heat load on the vehicle is detected by the outside air sensor 27 and the solar radiation sensor 28, as in the case of outlet temperature control.
Based on these, the target blowing air speed is determined, and the upper cold air control door actuator 13, the upper hot air control door actuator 14, and the lower The cold air control door actuator 15 and the lower warm air control door actuator 16 are controlled. Here, since the outlet temperature and the outlet air speed are controlled by the same actuator, it is necessary to prioritize the outlet temperature control and the outlet air speed control. It is experientially effective to control the blowout temperature. As described above, according to the air conditioner according to the present invention, the outlet temperature and outlet air speed are feedback-controlled by the outlet temperature sensor and the outlet air speed sensor provided at each outlet, so that they are not influenced by other outlet controls. Moreover, all the actuators do not require position detection sensors, which has the advantage of simplifying the structure and improving reliability.

〔Effect of the invention〕

According to the present invention, the temperature and air velocity of each outlet can be controlled independently, so that the temperature and airflow distribution inside the vehicle can be optimized. In addition, the temperature blown out from each outlet can be adjusted independently without detecting the position, and the temperature and wind speed are feedback-controlled by thermistor, so all detection methods are non-contact, and no installation adjustment is required. This has the effect of making it easier to ensure quality when retrofitting puller options, etc.

[Brief explanation of drawings]

1@ is a schematic diagram showing an embodiment of the automotive air conditioner according to the present invention, FIG. 2 is an air flow diagram of the embodiment shown in FIG. 1, FIG. 3 is a control flow diagram, and FIG. It is a target blowing temperature characteristic diagram which shows an example of target blowing temperature. 1c... Upper cold air passage, 1d... Upper warm air passage, 1
a...Lower cold air passage, 1□...Lower warm air passage, 4.
...Heater core, 6...Upper cold air control door, 7...
Upper hot air control door, 8...Lower cold air control door, 9...
・Lower hot air control door, 19, 21. 23...Blowout temperature sensor, 20°Answer 3 0 4th cause B warehouse【'';4K('c) a 0 1σ 2σ 0 0 5σ 21t''i!L /l('(-2

Claims (1)

[Claims] 1. A plurality of cold air passages that bypass the heater core, a plurality of hot air passages provided downstream of the heater core, and a plurality of air mixes for adjusting the ratio of air flowing into these passages. An air conditioner consisting of a door and a duct that independently guides the conditioned air adjusted by the air mix door to a plurality of outlets, inputs signals from an outside air sensor, room temperature sensor, solar radiation sensor, and temperature setting device. and a control circuit that processes these data and generates an output signal;
In an air conditioner for an automobile, comprising a control device comprising an output means for adjusting the operation of the air conditioner based on an output signal of the control circuit, instead of an air mix door provided in each temperature control passage, An air conditioner for an automobile characterized in that a cold air control door and a hot air control door are provided for each cold air passage and each hot air passage. 2. In the air conditioner for an automobile according to claim 1, the outlet for discharging conditioned air is provided with at least two sets of temperature detectors and wind speed detectors, and input signals from the detectors are calculated. What is claimed is: 1. An air conditioner for an automobile, comprising: an arithmetic processing unit and a door operating device that operate a cold air control door and a hot air control door based on the processing results.