JPH03295714A - Intake door controller of air conditioner for automobile - Google Patents

Abstract

PURPOSE:To enable control of air conditioner with high accuracy by preliminarily mapping the actual outside air introducing rate corresponding to each position of an intake door, and correcting the position of intake door so that the rate obtained from the map becomes the aimed outside air introducing rate. CONSTITUTION:A termal load is computed by a means 100 compute the aimed outside air introducing rate with a means 200 based thereon. The position of an intake door is detected by a means 300, and based on the data map of the actual outside introducing rate varying according to the position of intake door, the actual outside air introducing rate is computed with a means 400 based on the detected position of intake door. Further the position of intake door is determined by a means 500 so that the computed results may correspond to the computation result of the means 200, and based on the output the intake door is drive-controlled by a means 600.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling the drive of an intake door used in an automobile air conditioner so as to obtain a target outside air introduction rate.

(Prior Art) As a control device for an intake door, linear control as disclosed in, for example, Japanese Unexamined Patent Publication No. 63-222918 is well known. This method determines the target mixing ratio of outside air intake and inside air intake from a predetermined condition discrimination table based on the evaporator blowout temperature and the operating state of the cooling cycle. It is designed to be adjusted according to your ability.

(Problem to be Solved by the Invention) However, since the above device assumes that the opening degree of the intake door matches the outside air introduction rate, accurate control is not possible as long as the amount of intake outside air is proportional to the position of the intake door. However, in reality, due to the layout of the air conditioner and the structure of the air conditioner itself, the actual outside air introduction rate, that is, the amount of outside air sucked in, does not necessarily change linearly. This had the drawback that it caused errors in the air conditioning, making it impossible to perform highly accurate air conditioning control. Furthermore, the degree of the error varies depending on the type of vehicle or when the characteristics of the blower unit, for example, are changed in design. Therefore, it is desired that the intake door control device be configured to easily cope with variations in vehicle types and design changes. Ta.

Also, even if the opening degree of the intake door is the same, if the vehicle speed is high, the intake outside air volume will be larger than if it is small, and if the window glass is open than if it is closed. In the conventional technology in which the opening degree of the intake door directly corresponds to the outside air introduction rate, an amount of outside air that is different from the predetermined amount of intake outside air that is originally required is introduced into the air conditioning duct, which causes the inconvenience of fluctuations in the blowout air volume. be.

Therefore, in this invention, in order to fill the gap between the target intake outside air amount and the actual intake outside air amount, highly accurate and stable air conditioning control is performed by correcting the position of the intake door, and furthermore, the The object of the present invention is to provide an intake door control device for an automobile air conditioner that can easily cope with fluctuations and design changes.

(Means for Solving the Problems) The gist of the present invention is, as shown in FIG. an intake door that changes the introduction ratio of the heat load, a heat load calculation means 100 that calculates a heat load based on at least the temperature inside and outside the vehicle interior and a set temperature inside the vehicle interior, and a heat load calculation means 100 that calculates a heat load based on the calculation result of the heat load calculation means 100. target outside air introduction rate calculation means 200 for calculating a target outside air introduction rate; intake door position detection means 300 for detecting the position of the intake door; an actual outside air introduction rate calculation means 400 that calculates the outside air introduction rate on the data map from the position of the intake door detected by the intake door position detection means 300 based on the data map of the outside air introduction rate; The calculation result of the means 400 is calculated by the target outside air introduction rate calculation means 2.
an intake door position determining means 500 for determining the position of the intake door so as to match the calculation result of 00; and an intake door drive control means 600 for driving and controlling the intake door based on the output of the intake door position determining means 500. The goal is to have the following.

(Function) Therefore, the actual outside air introduction rate calculation means calculates the actual outside air introduction rate corresponding to the position of the intake door from the data map of the actually measured nonlinear outside air introduction rate, and makes sure that this matches the target outside air introduction rate. Since the position of the intake door is corrected by the intake door position determining means, the originally targeted intake air volume can be accurately obtained. In addition, by replacing only the data map, intake door control corresponding to each car model or design change can be easily performed, and if the data map is created taking into account changes in vehicle speed and window opening/closing, changes in vehicle speed and A stable intake amount of outside air can be obtained regardless of whether the window is opened or closed, and therefore the above object can be achieved.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the automobile air conditioner is provided with an intake device 2 at the most upstream side of an air conditioning duct 1, and this intake device 2 has an intake door 5 disposed at a part where an inside air population 3 and an outside air population 4 are separated. and this intake door 5
By operating the position X using the actuator 6, the ratio of inside air and outside air to be introduced into the air conditioning duct 1 can be varied. Note that the position ) is 0%.

The blower 7 sucks air into the air conditioning duct 1 and blows it downstream. Behind the blower 7, an evaporator 8 and a heater core 9 are provided.

Further, an air mix door 10 is provided in front of the heater core 9, and by adjusting the opening degree of the air mix door 10 with an actuator 11, the heater core 9
The ratio of air passing through the heater core 9 to air bypassing the heater core 9 is adjusted. Furthermore, the downstream side of the heater core 9 is divided into a defrost outlet 12, a vent outlet 13, and a heat outlet 14, which open into the vehicle compartment 15, and mode doors 16a, 16b are provided in the divided portions.

16c is provided, and the mode doors 16a, 16b.

The blowout mode can be switched by operating the actuator 16c.

The actuator 17, blower 7, and mode doors 16a, 16b, and 16c are each controlled based on output signals from a drive circuit (not shown), and these drive circuits are controlled by a microcomputer (not shown). It is connected. These drive circuits and microcomputer constitute a control unit 1-18 together with an A/D converter and a multiplexer (not shown).

This control unit includes a vehicle interior temperature sensor 20 for detecting the temperature inside the vehicle interior. An outside air temperature sensor 219 that detects the outside air temperature.A solar radiation sensor 22 that detects the amount of solar radiation. Temperature setting device 23 for setting the target temperature in the vehicle interior. A position detection sensor 24 is connected to detect the position of the intake door 5, and these output signals are selected by the multiplexer and input to the A/D converter, where they are converted into digital signals. After that, it is input into the microcomputer.

In FIG. 3, an example of the control operation of the intake door 5, which is controlled by the microcomputer of the control unit 18, is shown as a flowchart, and this will be explained below with reference to this flowchart.

The microcomputer starts this control from a start step 50, and in the next step 52, the detection value of the vehicle interior temperature sensor 20, the detection value of the R2 outside air temperature sensor 21, the detection value TAMI, the detection value of the solar radiation sensor 22, the temperature Signal input processing is performed to input the setting value T3ET set by the setting device 23 + the detection value X of the position detection sensor 24, etc.

Then, in step 54, among the input signals, a signal related to various factors of heat load, ie, a set temperature in the vehicle interior TSETr, a temperature in the vehicle interior T8. Based on the outside air temperature TA and the amount of solar radiation QSLIII, for example, the heat load T is calculated using equation (11).

T=A・(TSET-25)-B・(TR-25)-C
- (TA, IB-25) D-QsuH0E... (11) Here, A-E represents an arithmetic constant.

After the heat load T is calculated in step 54, step 5
Proceed to step 6, where the target outside air introduction rate θ' of the intake device is determined based on the heat load T so that the characteristic diagram of the same step can be obtained. This target outside air introduction rate θ° is a parameter that represents the amount of outside air sucked into the so-called air conditioning duct 1. In this embodiment, when the heat load is extremely small, θ゛ is decreased (to eliminate the outside air intake amount). 0%), when the heat load is extremely large, θ' is increased to allow only outside air to be taken in (100%).In a predetermined intermediate region, as the heat load increases, θ' linearly increases from 0% to 100%. It's about to change.

In step 58, a characteristic selection signal m used in the next step 60 is formed, and in step 60, an actual outside air introduction rate θ is calculated based on the position X of the intake door 5 and the characteristic selection signal m. Ru. Specifically, the actual outside air introduction rate θ for each position of the intake door 5 is sampled in advance in an experiment, this is mapped as shown in the same step, and this map is used from the actually measured intake door position WX. This determines θ.

Even if the intake door position I,Kz.

K1. ...). The characteristic selection signal m described above is used to select the characteristic line that best matches the current situation from among the plurality of characteristic lines.For example, when driving at high speed and the window glass is open, Since the outside air introduction rate .theta. increases, in the data map shown in step 60, KI (m) is formed in advance based on detection signals such as vehicle speed.

In step 62, the difference (θ゛-θ) between the target outside air introduction rate θ° calculated in step 56 and the actual outside air introduction rate θ calculated in step 60 is within a predetermined range (θ
゛−〇≦IP1). Here, P is a small arbitrary constant, and ideally it is preferably zero.

In this step 62, when θ°-〇 is within a predetermined range, that is, when θ' and θ are approximately equal, the position of the intake door 5 is in a state where the target outside air amount is approximately obtained. If so, proceed to step 66;
The intake door 5 is stopped. Also, θ°−θ〉
In the case of P, the actual outside air introduction rate θ is smaller than the target outside air introduction rate θ', so the intake door 5 is driven in the outside air introduction direction to increase the actual outside air introduction rate θ, so that θ becomes θ°.
(step 64). Conversely, θ°−θ<
-p, the actual outside air introduction rate θ is larger than the target outside air introduction rate θ゛, so the intake door 5 is driven in the inside air introduction direction to reduce the actual outside air introduction rate θ, so that θ becomes θ.
' (step 68).

After steps 64 to 68, the routine shifts to another air conditioning control routine, and then the above-described processing is performed again from step 50.

Therefore, considering the case where the target outside air introduction rate θ' is set to a certain value α based on the heat load, according to the conventional method, this α directly represents the position of the intake door 5, so it is not possible to actually The outside air intake rate θ does not match the outside air intake rate θ, and the amount of outside air for the official changes due to changes in vehicle speed, etc., but according to this embodiment, in order to obtain the actual outside air introduction rate θ of α, the intake door position is corrected, so even if the vehicle speed etc. fluctuate, a constant amount of outside air can be obtained for the official.

Furthermore, even if the structure of the air conditioner differs or the layout of the air conditioner differs depending on the vehicle model, it is possible to accurately obtain the target outside air intake rate simply by changing the data map.

In this embodiment, the target outside air introduction rate θ' is determined based on the heat load T, but any method may be used to calculate θ'. In addition, although the characteristic line of the data map is selected by the characteristic selection signal m, even if such a selection means is not provided and the same control is performed using one basic characteristic line, it is still somewhat difficult compared to the conventional method. This allows for highly accurate intake door control.

(Effects of the Invention) As described above, according to the present invention, the actual outside air introduction rate corresponding to each position of the intake door is mapped in advance, and the actual outside air introduction rate obtained from this map is the target outside air introduction rate. By correcting the position of the intake door so that the originally targeted amount of outside air is accurately introduced into the air conditioning duct, highly accurate air conditioning control can be performed.

In addition, even if there is a change in the car model or the design of the air conditioner,
Tuning is easy as only the data map needs to be replaced. Furthermore, if the data map itself is calculated in advance, taking into consideration not only differences in the structure and layout of the air conditioner, but also fluctuation factors such as vehicle speed and opening/closing of windows, it is possible to It also has the advantage of being able to maintain a constant intake amount of outside air even when the air conditioner is in use, allowing stable air conditioning control.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing the present invention, Fig. 2 is a schematic configuration diagram of an automotive air conditioner according to the invention, and Fig. 3 is a flowchart showing an example of the control operation of the intake door by the microcomputer of the control unit in the same. be. l...Air conditioning duct, 3...Inside air inlet, 4...Outside air inlet, 5...Intake door, 100...Heat load calculation means, 200...Target outside air introduction rate calculation means, 300
... Intake door position detection means, 400 ... Actual outside air introduction rate calculation means, 500 ... Intake door position determination means, 600 ... Intake door drive control means.

Claims (1)

[Scope of Claims] An intake door that is provided at a part where an inside air inlet and an outside air inlet of an air conditioning duct are separated and changes the introduction ratio of inside air and outside air; a target outside air introduction rate calculation means for calculating a target outside air introduction rate based on the calculation result of the heat load calculation means; and detecting the position of the intake door. an intake door position detection means; and a data map of an actual outside air introduction rate that changes according to the position of the intake door determined in advance. and determining the position of the intake door so that the calculation result of the actual outside air introduction rate calculation means matches the calculation result of the target outside air introduction rate calculation means. An intake door drive control means for an automobile air conditioner, comprising: an intake door position determining means; an intake door drive control means for driving and controlling the intake door based on an output of the intake door position determining means; .