JPH0126495Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a switching device for an air outlet of an air conditioner for a vehicle, particularly a bus.

(Prior art) Conventionally, air conditioners for vehicles, especially buses, are divided into two modes: vent mode and foot mode.
Cooling mode that requires cooling when turned ON (drive),
There is a so-called ventilation mode in which outside air is introduced when the outside temperature is relatively low.

The foot mode is a mode in which the hot water valve is opened to heat the heater core to perform heating. These two modes can be switched as appropriate depending on changes in the temperature inside the vehicle or changes in the set temperature, but when it is necessary to increase the temperature inside the vehicle during cooling (vent mode). (When the temperature inside the vehicle does not rise and cannot be controlled by simply stopping the air conditioner) Open the hot water valve and switch the air outlet to the lower air outlet. Immediately after switching the air outlet, cold air came out from the lower air outlet, which was uncomfortable. In addition, when it is necessary to lower the temperature inside the vehicle during heating (hood mode) (when the temperature cannot be lowered by simply closing the hot water valve), outside air is introduced, and the compressor is turned on (driven) as necessary. When the air outlet was switched to the upper air outlet, warm air came out from the upper air outlet, which was uncomfortable immediately after switching the air outlet. That is, each
Immediately after switching, the air conditioning feeling was extremely poor. The reason for this is that the heat capacity of the duct in the bus air conditioner is large, and the temperature of the blowing air does not change immediately even when switching is performed. As a countermeasure for this, as shown in Japanese Patent Application No. 1987-4617, in the ventilation mode provided between the heating mode and the cooling mode, in the ventilation mode closer to the cooling mode, air is blown from the upper air outlet. In the ventilation mode, which is closer to the heating mode, the problem is resolved by configuring the system so that air is blown out from the lower air outlet.

(Problems to be Solved by the Invention) However, since the upper and lower air outlets are selected even in the ventilation mode, there is a drawback that the control system is complicated.

Therefore, the purpose of this invention is to improve the air conditioning feeling when switching the air outlets without using an air outlet switching selection mode during ventilation.

(Means to solve the problem) The gist of this invention is to turn the compressor on and off.
a heating means that controls a hot water valve to adjust the heating capacity; an air outlet switching device that selects between an upper air outlet and a lower air outlet in the vehicle interior; Electric signals from both the temperature detection means for detecting the temperature and the temperature setting means for setting the temperature to a desired temperature are input, and output signals corresponding to the electric signals are used to control the capabilities of the cooling means and heating means and to control the air outlet. and arithmetic processing means for controlling switching, and a delay means for causing the switching operation of the outlet switching device to operate later than when the mode signal is switched.

(Function) Therefore, when switching between vent mode and foot mode, the blowout switching operation is activated later than when the mode signal is switched, so that the air remaining in the duct in the previous mode can be discharged, and the air can be discharged upward. The air blown out when the lower air outlet is switched is blown out at the required temperature and does not cause discomfort.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIGS. 1 and 2, an air conditioning unit 1 of a vehicle air conditioner includes a condenser 3 that constitutes a refrigeration cycle and a blower 4 that sends air to the condenser 3 on the left side of the top surface of a frame 2. Furthermore, an evaporator 5 and a heater 6 using engine cooling water, which constitute a refrigeration cycle, are arranged. The evaporator 5 is controlled by turning on and off a compressor, and the heater 6 is controlled by opening and closing a hot water valve. Both are arranged inside a case 7, and the top surface of the case 7 communicates with the interior of the vehicle from the floor surface (not shown). are doing.

The blowers 8, 8 have their suction sides communicated with the inside of the case 7, and their outlet sides communicated with the vehicle interior 15 via ducts 9, 9. The ducts 9,9 are both branched into two, and at the branch point there is a switching door 10 for selecting the wind outlet and an actuator 1 for moving the switching door 10.
An air outlet switching device 15 consisting of 1 is provided. A control example of this outlet switching device 15 will be explained below. One of the branched ducts 9a extends up the side wall of the vehicle 14 and communicates with an upper outlet 12 provided on the shoulder of the ceiling, and conditioned air is blown out from the upper outlet 12 during the vent mode. be.

Further, the other duct 9b has a lower air outlet 13.
Conditioned air is blown out from the lower air outlet 13 during the hood mode.

In FIG. 3, a basic configuration diagram of the air conditioning control including the outlet switching device is shown. First, the room temperature sensor 2
0, the outside air temperature is detected by the outside air sensor 21, and the set temperature is detected by the temperature setting device 22 as a resistance value, and the multiplexer 2
3. Input to the microcomputer 25 via the A/D converter 24, and the microcomputer 2
5, the calculation process is performed as appropriate. Based on this arithmetic processing, the compressor drive circuit 27 controls the drive of the compressor 26, the hot water valve drive circuit 29 controls the opening and closing of the hot water valve 28 to drive the heater, and the blower controls the rotation speed of the blower 30. The drive circuit 31 includes an air mix door drive circuit 33 for controlling the air mix door 32, and an air outlet switching drive circuit 3 for controlling the air outlet switching device 15.
4, respectively, as appropriate.

The switching of the switching door 10 of the outlet switching device 15 is as follows:
This is done by a mode signal for mode setting,
The mode signal is generally obtained by calculation from the composite resistance value of the vehicle interior temperature, outside air temperature, and set temperature, or the deviation between the vehicle interior temperature and the set temperature, and in this embodiment, two mode settings are used. It is becoming.

In the above configuration, if it is currently in foot mode and it is determined to switch to vent mode,
First, hot water valve 28 is closed. Furthermore, if necessary, the signal is output to a compressor drive circuit 27 to drive the compressor 26. At this time, it is output to the delay means 35, and as shown in FIG. 4, it is output to the blow-off switching drive circuit ₃₄ from a time _t2 delayed by several tens of seconds from the closing time t1 of the hot water valve 28, for example. The switching door 10 is switched to the vent mode side.

Conversely, when switching from vent mode to foot mode, the compressor drive circuit 27
A stop signal is output to the compressor 26.
At the same time, an open signal is output to the hot water valve drive circuit 29, and the hot water valve 28 is opened. Further, the output is simultaneously outputted to the delay means 35, and after being appropriately delayed from the start of driving the compressor 26, is outputted to the outlet switching drive circuit 34.
The switching door 10 is switched to the foot mode side.

Therefore, the switching of the switching door 10 is performed with an appropriate time delay from the switching point of the mode signal, so that the temperature of the air blown out from each outlet increases or decreases, and the temperature of the air blown out from each outlet increases or decreases. There is no discomfort caused by wind blowing from the strands.

In this embodiment, the delay means 36 is explained as an independent circuit, but it goes without saying that the delay means 36 may be implemented by an arithmetic processing means inside the microcomputer 25.

(Effects of the invention) As described above, according to this invention, by delaying the switching of the air outlet due to mode change from the time of switching the mode signal, it is possible to lower or increase the temperature inside the duct. There is no longer any need to worry about uncomfortable temperature air being blown out from the outlet.

In addition, since the ventilation mode is a vent mode in which air is blown only from the upper air outlet, the control system can be simplified.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an embodiment of this invention, Figure 2 is a plan view showing an embodiment of this invention.
This figure is a sectional view of the same as above, FIG. 3 is a configuration diagram of an electric circuit of this invention, and FIG. 4 is an operation explanatory diagram showing a control example of this invention. 5... Evaporator, 6... Heater, 12... Upper outlet, 13... Lower outlet, 15... Outlet switching device, 20... Room temperature sensor, 21... Outside air sensor,
22...Temperature setting device, 25...Microcomputer, 35...Delay means.

Claims (1)

[Scope of claim for utility model registration] A cooling means that adjusts the cooling capacity by turning the compressor ON and OFF, a heating means that controls the hot water valve and adjusts the heating capacity, and an upper air outlet and a lower air outlet in the passenger compartment. Electrical signals are input to both the air outlet switching device that switches and selects the temperature, the temperature detection means that detects the temperature inside the vehicle, and the temperature setting means that sets the temperature to a desired temperature. A calculation processing means for controlling the capacity of the cooling means and the heating means and controlling the switching of the air outlet, and a delay means for causing the switching operation of the air outlet switching device to operate later than when the mode signal is switched. An air outlet switching device for a vehicle air conditioner, characterized in that: