JPS6323206Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blowout mode switching control device for a vehicle air conditioner, and particularly to means for setting a reference value for switching the blowout mode.

In general, a vehicle air conditioner such as that disclosed in JP-A No. 56-86815 is equipped with an evaporator 2, a heater core 3, an air mix door 4, and mode switching doors 6, 7 provided in an air conditioning duct 1, as shown in FIG. . The air mix door 4 and mode switching doors 6, 7 are driven by actuators 8, 9, 10. Reference numeral 11 denotes a control device consisting of, for example, a microcomputer, which calculates a total signal _f by calculating a setting signal T _D from a temperature setting device 12 and a signal tr from an inside air sensor 13 that detects the temperature inside the vehicle. , each drive circuit 14, 15 is controlled based on the magnitude of this total signal f, the opening degree of the air mix door 4 is controlled, and the mode switching doors 6, 7 are set to a foot blow mode, a defrost blow mode, and a face blow mode. mode. In addition, 21 is a foot air outlet, 22 is a defrost air outlet, 23
is the face outlet.

That is, for example, when the set temperature is increased, the overall signal f gradually increases, and the air mix door 4
The opening degree D gradually increases. For example, the total signal f
becomes f ₁ , f ₀₁ , f ₂ , f ₀₂ , the opening degree D becomes D ₁ , D ₀₁ ,
D ₂ and D ₀₂ . In this way, air mix door 4
As the opening degree increases, the mixing ratio of warm air gradually increases, so the temperature on the downstream side of the heater core 3 increases. On the other hand, the mode switching doors 6 and 7 can be used to switch from the face blow-off mode to the bi-level blow-out mode, from the bi-level mode to the foot blow-off mode, and in the opposite direction, that is, from the foot blow-off mode to the bi-level mode. The relationship between the temperature on the downstream side P of the heater core 3 and the opening degree D is shown in FIG. When the total signal f gradually increases and the opening degree D changes to gradually increase, the modes are switched according to the characteristic M. When the opening degree D becomes D ₀₁ and the temperature on the downstream side of the heater core 3 becomes t ₁ , the face blowing mode is switched to the bi-level mode,
Furthermore, when the opening degree further increases to D ₀₂ and the temperature on the downstream side P of the heater core 3 reaches t ₂ , the bilevel mode is switched to the foot blow mode.
Also, when the overall signal f gradually decreases from a large value and the opening degree D changes to become smaller, the opening degree D becomes D ₂ and the temperature on the downstream side P of the heater core 3 increases.
At t ₀₂ , the foot blow mode is switched to the bi-level mode, and when the overall signal f becomes smaller, the opening degree D becomes D ₁ , and the downstream temperature of the heater core 3 reaches t ₀₁ , the bi-level mode switches to the bi-level mode. The mode can be switched to partial blowout mode. In this way, the opening degree D
When the value changes from a small value to a large value, a shift (dead zone) S is given at each switching point. By providing the deviation S in this way, it is possible to improve the feeling on the passenger side, and it is also possible to prevent the mode switching door from swinging when the overall signal f changes up or down within the range of the deviation S.

In the control device 11, when the overall signal f gradually increases and reaches the reference value _f01 , the mode switching door is switched from the face blowing mode to the bi-level mode.
Further, the actuators 9 and 10 are controlled so as to switch from the bi-level mode to the foot blow mode when the total signal f reaches the reference value f ₀₂ . The actuators 9 and 10 are also operated so that when the overall signal f gradually decreases and reaches the reference value _f2 , the foot blow mode is switched to the bi-level mode, and when the total signal f becomes _f1 , the bi-level mode is switched to the face blow mode. It's about controlling. The control device 11 receives the overall signal f and each mode switching reference value f ₀₁ , f ₀₂ and f ₂ , f ₁
It can be said that it has a comparative control function. In this case, each of the reference values f ₀₁ , f ₀₂ , f ₂ , f ₁ is stored in advance in the readout memory ROM and masked.

However, conventional vehicle air conditioners
Depending on the model, the temperature change on the downstream side P of the heater core 3 with respect to the change in the opening degree D of the air mix door 4 is not uniform, and in some models,
When the opening degree D changes to become larger, the temperature on the downstream side of the heater core rises quickly, and in some models, the rise is slow. Therefore, if the above reference values f ₀₁ , f ₀₂ , f ₂ , f ₁ are stored in ROM and masked, there will be a difference between the mode switching timing and the switching temperatures t ₁ , t ₂ , t ₀₁ , t ₀₂ A misalignment will occur. For example, in a model where the temperature rise on the downstream side of the heater core 3 is gradual, the mode switching characteristic M changes as shown in M'.
Assuming that the face blowing mode is switched to the bi-level mode at the above reference value f ₀₁ , the temperature on the downstream side P of the heater core 3 at this time is the above switching temperature t ₁
If the temperature t ₁ ' becomes higher than the reference value f ₀₂ and it is assumed that the bilevel mode is switched to the foot blow mode at the reference value f 02 , then the downstream side P of the heater core 3 at this time
The temperature becomes t ₂ ′, which is lower than the switching temperature t ₂ . Similarly, even when the total signal f decreases from a large value, the mode is switched at a temperature t ₀₂ ' where the temperature on the downstream side of the heater core 3 is low. Further, in a model in which the temperature on the downstream side of the heater core 3 rises quickly with respect to the opening degree of the air mix door, the operation opposite to this case is performed.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks by outputting reference values for switching between the above-mentioned modes from a mode detection element provided outside the control device 11. Explain in detail.

FIG. 3 is a block diagram showing an embodiment of a blowout mode switching control device for a vehicle air conditioner according to the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals.

In this case, the setting signal from the temperature setting device 12
T _D and the signal _tr from the internal air sensor 13 are input to the control device 11 via the multiplexer 16 and the analog-to-digital converter 17 .

The control device 11 is composed of a central processing unit constituting a microcomputer, for example.
It has a storage device 30 consisting of a RAM (random access memory), and sets the stop position of the actuator 8 that drives the air mix door 4 by controlling the drive circuit 14 described above. The control device 11 also controls a mode switching door drive circuit 15, a compressor drive circuit 31, a blower, and the like.

32 is a magnetic detection element such as a Hall element that is linked to the air mix door 4, and two magnets 33 and 34 are placed on the movement trajectory of this element 32 as shown in FIG.
is provided. The element 32 may be provided in a link connecting the air mix door 4 and the actuator 8 or in a gear mechanism constituting the actuator, or may be attached to a duct in which the air mix door 4 is housed. The mounting positions of the magnets 33 and 34 are set in advance for each model so that an optimum mode switching reference value can be obtained according to the operating characteristics of the air mix door 4. A signal output when the magnetic detection element 32 detects magnetism is amplified by the operational amplifier 36 and then input to the control device 11. 37 is a potentiometer consisting of a variable resistor that detects the opening degree D of the air mix door 4;
It has a variable terminal linked to the air mix door 4, and its output signal is amplified by an operational amplifier 35 and input to the multiplexer 16.

Here, when the air mix door 4 is rotated from the full cooler mode side to the full heater mode direction and the element 32 sequentially detects the magnets 34 and 33, the control device 11 uses the output from the potentiometer 37 to control the air mix door at this time. A total signal corresponding to the opening degree of No. 4 is obtained, stored in the RAM 30, and used as a reference value for mode switching. For example, if the temperature characteristics of the air mix door 4 of a certain model of vehicle air conditioner are as shown in M' in FIG. Based on the output from the meter 37, the total signals f ₁ ′, f ₂ ′ corresponding to the opening degree D of the air mix door 4 at this time are obtained, and this is stored in the RAM 30, and thereafter, the signals f ₁ ′,
f ₂ ′ is used as the reference value for mode switching. In other words, the mounting positions of the magnets 34 and 34 are set in advance so that the most suitable mode switching reference values f ₁ ′ and f ₂ ′ for each model can be obtained at the assembly stage. be. In addition, the mode switching reference value when the air mix door 4 rotates from the full heater mode side to the full cooler mode side.
For f ₀₂ ′ and f ₀₁ ′, the value of the dead zone S is stored in the ROM in advance, and the value of this dead zone S and the reference value f ₁ ′,
f ₀₂ ′ and f ₀₁ ′ can be obtained from the calculation of f ₂ ′, and these values are stored in the RAM 30. Alternatively, the element 3 is placed at the position corresponding to this mode switching reference value f ₀₂ ′, f ₀₁ ′.
Other magnets detected in step 2 may also be attached.

Next, the operation of the blowing mode switching control device for the vehicle air conditioner of the present invention will be described with reference to the flow chart shown in FIG.

First, the blower for introducing inside and outside air is stopped, the air mix door 4 is moved to the full cooler mode and stopped, and from this state is moved to the full heater mode. Here, when the magnet 34 is detected, the switching reference value f ₁ ' is determined from the opening degree D ₁ ' (output of the potentiometer 37) of the air mix door 4 at this time, and this value is determined.
Store in RAM30. Next, when the magnet 33 is detected, the opening degree of the air mix door 4 at this time is determined.
A reference value f ₂ ' is obtained from D ₂ ' and is stored in the RAM 30. Next, switching reference values f ₀₁ ′ and f 02 ′ are determined from f _{1 ′} and f ₂ ′, and are stored in the RAM 30. Hereafter, the above
Mode switching reference values f ₁ ′, f ₂ ′, stored in RAM 30
The mode switching door is controlled based on f ₀₁ ′ and f ₀₂ ′.

These mode switching reference values f ₁ ′, f ₂ ′, f ₀₁ ′,
The setting operation of f ₀₂ ′ may be performed when the start switch or ignition switch of the vehicle air conditioner is turned on, or when a manually operated switch is separately provided and this switch is turned on. Further, in place of the elements 32, 33, and 34, reed switches, microswitches, photoelectric elements, etc. may be used.

Further, the position of the magnet 32 may be adjustable.

As explained above, according to the blowout mode switching control device for a vehicle air conditioner according to the present invention, a position detection element interlocked with the air mix door and a detected element provided in the movement range of this element are provided,
Since the overall signal when the position detection element detects the detected element is used as the mode switching reference value, it is possible to set the position of the detected element to the optimum position for each model in advance. , the blowout mode can be changed to suit the model of the aircraft, improving the feeling for the occupants.

[Brief explanation of the drawing]

Figures 1 and 2 are block diagrams and characteristic diagrams showing an example of a conventional vehicular air conditioner switching control device, and Figures 3 and 4 are illustrative of the vehicular air conditioner according to the present invention. A block diagram and a configuration diagram showing one embodiment of the switching control device, and FIG. 5 is a flowchart for explaining the operation of the blowout mode switching control device of the present invention. 1... Duct, 2... Evaporator, 3... Heater core, 4... Air mix door, 6, 7...
Mode switching door, 11...Control device, 12...Temperature setting device, 13...Inside air sensor, 32...Magnetic detection element, 33, 34...Magnet.

Claims (1)

[Claims for Utility Model Registration] (1) Control a blowout mode switching door by comparing at least a comprehensive signal that changes in response to a setting signal from a temperature setting device with a mode switching reference value; In a control device that sets the opening degree of an air mix door based on the size of
A position detection element interlocked with the air mix door and a detected element provided within the movement range of this element are provided, and the value of the overall signal when the position detection element detects the detected element is set as the mode switching reference value. 1. A blowout mode switching control device for a vehicle air conditioner. (2) The control device has a storage device, and the storage device stores the mode switching reference value given when the position detection element detects the detected element. A blowout mode switching control device for a vehicle air conditioner according to item 1.