JPS61105205A - Air conditioning device for car - Google Patents

Abstract

PURPOSE:To prevent heated air from blowing against a rider by restraining the opening of an air mix door to be less than a certain value and fixing the speed of rotation of a blower at a low rate when the captioned system is set at a blow out mode in which said air mix door opens a heater-core side passage and air is blown out toward the face part of said rider. CONSTITUTION:An air conditioning device adjusts the rate of air which passes through a heat core 7 in an air conditioning duct 1, by means of an air mix door 10, and selects the blow-out mode of air which is blown out from the air conditioning duct 1 into a car room, through a blow-out mode selecting means 20. When a blow-out mode in which air is blown out toward the face part of a rider, is selected by the means 20 and as the selection is detected by a mode detecting switch 21, the opening of the door 10 is restrained to be less than a certain value through an opening restraining means 100. At the same time, when an air mix door switch 14 detected that the door 10 opened a passage on the heater core 7 side, a blower 5 is fixed to be a low rate through a low-rate fixing means 200.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an air mix type automobile air conditioner, and particularly relates to control of a blower and an air mix door.

(Prior art) As this type of air conditioner for automobiles, for example,
As shown in Publication No. 8-22711, when the blowout mode is set to the vent or pie level where air is blown toward the passenger's face, the opening degree of the air mix door is regulated so that it does not reach the full heat position. This is well known. This is because - when the temperature inside the vehicle is lower than the outside air temperature, such as in the middle of spring or autumn, heated air passes through the heater core and is blown into the occupant's face, causing discomfort through the air mix door. This is to avoid this by regulating the opening of the valve.

(Problem to be Solved by the Invention) However, in the above conventional example, the rotation speed of the blower increases to about a medium speed within the range where the opening degree of the air mix door is regulated. Even though we took great pains to restrict the opening of the air mix door to suppress the rise in the temperature of the blown air, the relatively high temperature air hit the occupants' faces relatively quickly, making it worse than before. There was a problem in that it was accompanied by a sense of pleasure.

Therefore, an object of the present invention is to provide an air conditioner for an automobile that can significantly improve the passenger feeling by regulating the opening of the air mix door and fixing the rotation speed of the blower at a low speed. It is said that

(Means for Solving the Problems) As shown in FIG. The proportion of air passing through the air mix door 10 is regulated by the air mix door 10. If this air mix door 10 opens the passage on the heater core 7 side, the air mix door switch 1
Detected by 4. Further, a blowout mode selection means 20 is provided for selecting a blowout mode of the air blown into the passenger compartment from the air conditioning duct 1, and the blowout mode selection means 20 selects a blowout mode for blowing air toward the face of the occupant. If so, it is detected by the mode detection switch 21. When there is an output from the mode detection switch 21, the opening degree of the air mix door 10 is regulated by the opening degree regulating means 100, and outputs from both the air mix door switch 14 and the mode detection switch 21 are output. If the blower 5 has a low speed fixing means 200
The speed is fixed at low speed.

(Function) Therefore, when the vent mode or pie level mode is selected by the blowout mode selection means 20, the opening degree of the air mix door 10 is restricted by the opening degree regulating means 100, and maximum heating is not achieved. In this case, when the air mix door 10 opens the passage on the side of the heater core 7, the rotation speed of the blower 5 is fixed at a low speed by the low speed fixing means 200, so that the occupant's face receives almost no heated air. Therefore, it is possible to achieve the above-mentioned task without having to be affected.

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

In Fig. 2, an inside air population 2 and an outside air population 3 are formed in the form of two branches on the most upstream side of the air conditioning duct 1, and an inside/outside air switching door 4 is provided at the divided part, and this outside air switching door 4 is provided at the divided part. The air to be introduced into the air conditioning duct 1 is selected by the door 4 between inside air and outside air.

The blower 5 is for sucking air into the air conditioning duct 1 and blowing it to the downstream side, and an evaporator 6 and a heater core 7 are arranged on the downstream side of the blower 5.

The evaporator 6 constitutes a cooling cycle together with a compressor (not shown), etc., and is designed to cool the air passing therethrough.The temperature of the evaporator 6 or the temperature of the air passing through the evaporator 6 is detected by the mode sensor 8. . Furthermore, the heater core 7 is inserted into a hot water cycle in which engine cooling water circulates and heats the air passing through it. When the temperature is below a predetermined value, this water temperature switch 9 is closed.

An air mix door 10 is provided in front of the heater core 7, and this air mix door 10 adjusts the ratio of air passing through the heater core 7 to air bypassing the heater core 7 according to its opening degree e. The actuator 1 is connected to an electric actuator 12 via the
2, it is rotated from full cool positions F, C, where the passage on the heater core 7 side is completely closed, to full heat positions F, H, where the passage on the heater core 7 side is completely opened. The actuator 12 includes a potentiometer 13 that detects the opening degree of the air mix door 7, and a potentiometer 13 that detects the opening degree of the air mix door 7.

The air mix door switch 14 is closed when the door is slightly opened toward the heat side.

The downstream side of the air conditioning duct 1 is divided into a vent outlet 15, a heat outlet 16, and a defrost outlet 17, which open into the vehicle interior, and a mode door 18, 19 is installed in the divided part.
are provided, and such air outlets 15 to 17 and mode door 1 are provided.
8.19 constitutes a mode selection means 20, which allows the mode selection means 20 to select the blowing mode of the air blown into the vehicle interior. That is, when the vent outlet 15 is opened as shown in the figure, the mode door 18 is in a vent mode in which air is blown out to the passenger's face.
When the vent outlet 15 and the heat outlet 16 are set to the intermediate position and the vent outlet 15 and the heat outlet 16 are half-opened, air is blown out to both the passenger's face and feet.
When only the defrost outlet 17 is opened, air is blown out to the occupant's feet in a heat mode, and when the defrost outlet 17 is opened, air is blown out toward the inner surface of the windshield. For example, a mode detection switch 21 is provided at a portion where the mode door 18 contacts the air conditioning duct 1, and this mode detection switch 21 is closed when the vent mode is set.

In FIG. 2, the blower 5 and the air mix door 10
The control unit 22 has a microcomputer 23, and the microcomputer 23 includes a central processing unit CPU and a read-only memory ROM.

It is well known per se, having a random access memory RAM, an input/output device Ilo, etc. The microcomputer 23 receives information from a vehicle interior temperature sensor 24 that detects the temperature inside the vehicle, an outside air temperature from an outside air sensor 25 that detects the temperature of the outside air, and solar radiation that detects the amount of solar radiation entering the vehicle interior. Analog electrical signals corresponding to the amount of solar radiation from the sensor 26, the detected temperature from the mode sensor 8, the set temperature from the temperature setting device 27 for setting the temperature inside the vehicle, and the opening degree from the potentiometer 13 are sent by the multiplexer 28. The signal is selected, converted into a digital electrical signal by the A/D converter 29, and inputted.

Also, A, port and A of this microcomputer 23
2 port has the water temperature switch 9. The on/off signals from the air mix door switch 14 and mode detection switch 21 are sent to the buffer 30a.

°ζ is input via 30b. That is, for the water temperature switch 9. A series circuit 32 consisting of an air mix door switch 14, a mode detection switch 21, and a diode 31 is connected in parallel, and the signal at the connection point is input to port A of the microcomputer 23 via a buffer 30a. air mix door switch 1
4 and the mode detection switch 21 is inputted to the A2 port of the microcomputer 23 via the buffer 30b. Therefore, when the water temperature switch 9 is closed (when the water temperature in the hot water cycle is below a predetermined value), or when the air mix door switch 14 and the mode detection switch 21 are closed (the air mix door is opened to the heat side). When the mode detection switch 21 is closed (when the mode detection switch 21 is in the vent mode), the input signal of the A2 port becomes "0". becomes.

Then, in this microcomputer 23, a control signal for controlling the rotation speed of the blower 5 is determined based on the input signal, and is outputted to the D/A converter 33.
is converted into an analog signal via the power transistor 34 and amplified by the power transistor 34 to control the energization of the blower 5. The signal is outputted to a drive circuit 35, amplified by the drive circuit 35, and controlled to energize the actuator 12.

In FIG. 4, an example of the control operation of the microcomputer 23 is shown as a flowchart, and the microcomputer 23 starts execution of processing from a start step 36 when a main switch (not shown) is turned on, and then performs the next judgment step. In step 37, it is determined whether or not the input signal of the A2 port is O''. If it is determined in this determination step 37 that A2=0, the process proceeds to opening degree regulation step 38, and in this step 38, the air The opening degree of the mix door 10 is controlled to be equal to or less than e1.That is, as shown by the dotted line in FIG.
, the opening degree of the air mix door 10 is adjusted according to the heat load T, but if the heat load T is T or more, the opening degree of the air mix door 10 is kept constant at el. Make it.

This means that if A2=0, the mode detection switch 21
is closed and in vent mode, and the air mix door 10 is set to full heat position F, H.

This step is to prevent the air heated by the heater core 7 from being blown out toward the passenger's face if the opening is opened to the maximum extent. has been done.

On the other hand, according to the judgment step 37, A2=0 is not determined, that is,
If it is determined that A2=1, the routine advances to normal control step 39. In this step 39, as shown by the solid line in FIG. 5, the opening restriction is canceled and the air mix door 10 is changed from the full cool position wF, C, to the full cool position gF in the entire range of heat load T.

It is made to change according to the heat load T up to H6.

When the processing in steps 38 and 39 is completed, the process proceeds to the next determination step 40, and in this step 40, it is determined whether the input signal of the A1 boat is "0" or not. A by this determination step 40.

If it is determined that = 0, the process proceeds to low speed fixing step 41;
In step 41, the rotational speed of the blower 5 is fixed at a low speed, as shown by the dotted line in FIG. This is A
If I=0, the water temperature switch 9 is closed and the temperature of the engine cooling water is low, and the heating capacity of the heater core 7 is small, or the air mix door 10 opens the passage on the heater core 7 side in the vent mode. In this case,
When the rotation speed of the blower 5 is increased, cold air is blown out to the feet of the occupant, or hot air is suddenly blown out toward the occupant's face, giving a bad feeling (and preventing this feeling from getting worse). This step 40
This constitutes the low speed fixing means 200 shown in FIG.

On the other hand, if it is determined in step 40 that A is not 0, that is, A is 1, the process proceeds to automatic control step 42. In this step 42, as shown by the solid line in FIG. 5, the blower 5 is adjusted to be symmetrical with respect to the heat load To that balances the capacity of the air conditioner.
This is to control the rotation speed of the motor.

In the above embodiment, as described above, the series circuit 32 including the air mix door switch 14 and the mode detection switch 21 is connected in parallel with the water temperature switch 9 to constitute an input circuit to the control unit 22. By attaching and detaching the circuit 32 externally, there is an advantage that it becomes easy to correspond to the grade of automobiles. That is, if the series circuit 32 is removed, the process of step 38 is simply omitted since Az"" is always 1. If the water temperature switch 9 is connected to the control unit 22, this series circuit Depending on whether or not 32 is connected, the opening regulation function can be provided or not provided, and in either case, the hardware and software in the control unit 22 can be used in common, and the circuit It can be used for general purposes.

In the above embodiment, the opening degree of the air mix door 10 is restricted only in the vent mode, but the opening degree may be similarly restricted even in the high level mode. The mode detection switch 21 also serves as an operation switch when the mode door 19 is moved by an actuator.

(Effects of the Invention) As described above, according to the present invention, when the air mix door opens the passage on the heater core side and is set to the blowout mode in which air is blown toward the passenger's face, The opening degree of the air mix door is regulated below a predetermined value, and the rotation speed of the blower is fixed at a low speed.
In such a case, the heated air can be prevented from hitting the occupant, and the feeling of the occupant can be improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an air conditioner for an automobile according to the present invention, Fig. 2 is a block diagram showing the main body of an air conditioner for an automobile in an embodiment of the invention, and Fig. 3 is a block diagram showing the main body of an air conditioner for an automobile according to an embodiment of the invention. FIG. 4 is a block diagram showing the control unit, FIG. 4 is a flowchart showing the control operation of the microcomputer in the control unit, and FIG. 5 is a characteristic diagram showing the control characteristics of the blower and air mix door in the same. DESCRIPTION OF SYMBOLS 1...Air conditioning duct, 5...Blower, 7...Heater core, 10...Air mix door, 14...Air mix door switch, 20...Blowout mode selection means,
21...Mode detection switch, 100...Opening degree regulating means, 200...Low speed fixing means. Patent applicant: Diesel Equipment Co., Ltd. Q) Ma Figure 4 Figure 5 O Thick ← Heat load (T) - + - Small

Claims (2)

[Claims] 1. An air conditioning duct, a blower and a heater core placed in the air conditioning duct, an air mix door that adjusts the proportion of air passing through the heater core by the degree of opening, and an air mix door that detects when the air mix door opens a passage toward the heater core. a blowout mode selection means for selecting a blowout mode for air blown into the passenger compartment from the air conditioning duct; and a blowout mode for blowing air toward the passenger's face by the blowout mode selection means. a mode detection switch that detects that the mode detection switch is activated, an opening regulating means that regulates the opening degree of the air mix door when the output of the mode detection switch is detected, and an opening regulating means that regulates the opening degree of the air mix door when the output of the mode detection switch is output. An air conditioner for an automobile, comprising: low speed fixing means for fixing the blower at a low speed when the blower is operated at a low speed. 2. The air mix door switch and the mode detection switch are connected in series to form a series circuit, and this series circuit is connected in parallel with a water temperature switch that detects the water temperature to the heater core. 1. The air conditioner for an automobile according to item 1.