JPH0452094Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vehicle air conditioner that prevents unpleasant warm air from being blown out from an upper air outlet in a vehicle interior.

(Prior Art) Conventionally, as a vehicle air conditioner that prevents uncomfortable warm air from being blown out from the upper air outlet in the vehicle interior, the applicant of the present application proposed the system disclosed in Japanese Patent Application Laid-Open No. 58-22711.
There is something disclosed in the publication No.

In this vehicle air conditioner, when the upper air outlet is selected as the air outlet mode in the vehicle interior, such as in bi-level mode, the maximum heating state is limited, especially when the air outlet mode is manually selected. The opening degree of the mixer door toward the heating side is uniformly restricted, thereby preventing the blowing of warm air that would make the occupants uncomfortable and improving the feeling of the occupants.

(Problem to be solved by the invention) However, in the above-mentioned air conditioner, the outlet temperature is controlled by regulating the maximum opening degree of the mix door during manual operation, so the distribution upstream of the mix door is When the air temperature is high, there is a risk that high temperature air may be blown out from the upper air outlet (vent outlet). That is, when the vent outlet is selected during manual operation, the mix door is set to the maximum regulation value B (50%) on the cool side, as shown in Figure 4 (the mix door is set to 0).
50%), but as shown in Figure 5, when the temperature T _{n of} the air passing through the evaporator on the upstream side of the mix door is, for example, T _n = 0°C, the blowout temperature T _O is approximately 25°C. However, for example, if the air temperature T _n is 10°C during _{recirculation} (recirculation of internal air), the blowout temperature will be 35°C, and air at an uncomfortable temperature will be blown onto the occupant's face.

Therefore, in the present invention, the above problem is solved by changing the preset regulation value of the mix door opening according to the temperature inside the duct, at least when the mode of blowing from the upper outlet is selected. The purpose is to

(Means for Solving the Problems) The vehicle air conditioner of the present invention includes at least a vehicle interior temperature sensor that detects the temperature inside the vehicle interior, a duct sensor that detects the temperature of the air that has passed through the evaporator in the duct, Equipped with a temperature setting device to arbitrarily set the temperature inside the vehicle, the opening degree of the mixer door is automatically controlled based on the output signals from these sensors and the temperature setting device, while each blowing mode can be selected by manual operation. In a vehicle air conditioner that regulates the opening degree of the mixer door, when at least the mode in which air is blown from the upper air outlet is selected by manual operation among the air blowing modes, the air conditioner controls the opening degree of the mixture door. The structure includes a regulation value determining means for determining a regulation value of the mix door opening based on the deviation between the blowout regulation temperature and the temperature detected by the duct sensor.

(Function) Therefore, when the mode in which air is blown out from the upper air outlet is selected by manual operation as the air blowing mode in the vehicle interior, the temperature is set based on the deviation between the preset target blowing regulation temperature and the temperature detected by the duct sensor. Since the regulation value for the intake door opening is determined by the regulation value determining means, the regulation value for the intake door opening is changed in accordance with the temperature of the air that has passed through the evaporator. High-temperature air is not blown out from the air outlet, and discomfort on the occupant's face can be prevented.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 shows a schematic configuration of an automotive air conditioner 10. As shown in FIG. First, the air conditioner 10 will be described. The most upstream side of the duct 12 is equipped with an intake door 15 that switches between an inside air inlet 13 and an outside air inlet 14. Inside this duct 12, a blower 16 and an evaporator 17 are installed in order from the upstream side. , Mixdoor 1
8. A heater core 19 is disposed, and a vent outlet 2 communicating with the vehicle compartment 20 is provided on the most downstream side of the duct 12.
1. A defroster outlet 22 and a heat outlet 23 are provided. These vent outlet 21 and defroster outlet 22 are switched by a switching door 24 for mode switching, and the heat outlet 23 is
It is opened and closed by a switching door 25.

The intake door 15 is driven by a motor actuator 33 to switch intake between outside air and vehicle interior air. The blower 16 is operated by a drive circuit (blower drive means) 35 and sucks and introduces air into the duct 12 through the intake door 15 . The evaporator 17 includes a compressor 26 that compresses and circulates refrigerant, a condenser 27, a receiver tank 28, an expansion valve 29, and a cooler 30.
It consists of The cooler 30 is driven by a pulley 31 to which power from an engine 41 is transmitted via a magnetic clutch 32. The air introduced by the blower 16 passes through the evaporator 17 and is cooled.

Furthermore, engine cooling water is passed through the heater core 19, thereby heating the air that has passed through the evaporator 17. The ratio of air passing through the heater core 19 is set by the opening degree of the mix door 18, and the mix door 18 is driven by a motor actuator 37. Each switching door 24, 25 for mode switching is driven by a motor actuator 39, selects the vent outlet 21, the defroster outlet 22, and the heat outlet 23, and sends conditioned air into the vehicle interior 20. do.

Furthermore _, a potentiometer ₅₁ detects the opening degree _θ A vehicle interior temperature sensor 54 that detects the interior temperature _tr is disposed upstream of the mixer door 18 and is connected to the evaporator 17.
A duct sensor 55 that detects the air temperature Tm at point A that has passed through the 11, and a manual switch 58 for manual operation switching of the air conditioner is connected to the control circuit 11.

Further, the control circuit 11 includes an I/O port,
It consists of a microcomputer with a CPU, memory, etc. In the case of AUTO, a total signal (control signal) T is calculated based on each data input from the A/D converter 42, and each control signal based on this total signal T is used to control the drive circuit 34.
control to switch the intake door 15, control the drive circuit 36 to operate the cooler 30 via the magnetic clutch 32, control the drive circuit 38 to control the opening degree of the mix door 18, The blowout mode is automatically set by controlling the circuit 40 to switch the switching doors 24 and 25. Further, by turning on the manual switch 58, switching between inside and outside air and blowing mode can be performed manually.
Further, when the vent outlet 21 is selected as the blowout mode by the manual switch 58, the limit value determining means for determining the limit value for the opening degree of the mix door 18 is constituted by the above-mentioned microcomputer.

Next, air volume control of the air conditioner will be explained based on the flowcharts shown in FIGS. 2 and 3.
2 shows a main routine for air conditioning control, and FIG. 3 shows a subroutine for mix door control.

First, when the air conditioner is started, air conditioning control starts according to the main routine, and in step _P1 , each register of the microcomputer and
Initial setting of data in the RAM is performed, and in step _P2 , a total signal T for controlling the entire air conditioner is calculated. Next, in step _P3 . Based on the data from the solar radiation sensor 52, the total signal T is corrected according to the solar radiation _tS . In addition, in step _P4 , data T _n from the duct sensor 55 and the mix door 18 are
_{The blowout temperature T F is} calculated based on _the opening _{degree θ} The intake door 15 to be switched, the compressor 26, etc. are controlled.

_As shown in FIG _. 3 _, the mix door control _is performed in _{step P501} by inputting the detection signals _θ And the on/off signal of the manual switch 58 is read. Then _, in step _{P502 , the} opening _{degree θ} Based on the signal, it is determined whether the air conditioner is automatic (AUTO) or manual. If automatic, the motor actuator 37 is driven by the drive circuit 38 in step _P504 , and the mix door 18 is set to the calculated value _θ The air conditioning is automatically controlled to maintain the set temperature inside the vehicle.
The control characteristics of the mix door 18, blower 16 and compressor 26 in this case are shown by solid lines in FIG.

If the mode is not automatic in step _P503 , that is, in the case of manual mode, step _P505 determines whether the blowout mode is a mode in which the air is blown from the upper blowout port 21, and step _P506 determines whether or not the blowout mode is a mode in which air is blown out from the upper blowout port 21. ), and if it is not both the vent mode and the bi-level mode, the process proceeds to step _P504 , where the mix door 18 is set to the calculated value _θX as in the automatic mode.

If it is in vent mode at step P ₅₀₅ ,
In step _P506 , the opening degree of the mixer door 18 is determined by calculating α ₁ = K ₁ (T _F - T _n ) using the preset blowout regulation temperature T _r , the air temperature T _n at point A, and the coefficient K ₁ . The regulation value α ₁ is calculated and determined by the regulation value determining means, and in step P ₅₀₇ , the drive circuit 38 and motor actuator 37 are driven so that the mix door 18 reaches the regulation value α ₁ , thereby changing the opening degree. settings are made. Therefore, for example, if K ₁ =2 and T _r =25°C, then T _n =
At 0°C, the regulation value _of the opening degree _θ In addition, when T _n = 10℃, the regulation value _of the mixer door opening _θ This makes it possible to always match the air outlet temperature to the target regulation temperature _TF , thereby eliminating the discomfort felt by the occupants due to high temperature air outlet.

In addition, if it is not the vent mode at step _P505 , it is determined whether the mode is bilevel mode at step _P508 , and if it is the bilevel mode, the mix door opening degree is adjusted using the coefficient _K2 at step _P509. The regulation value α ₂ is calculated and the step
At _P510 , similarly to the above, the mixture door opening limit value is set to _α2 , making it possible to eliminate the discomfort of the occupant.

(Effect of the invention) As explained above, according to the invention, when the blowout mode is selected by manual operation to blow out from the upper blowout port, the preset target blowout regulation temperature and the detected temperature of the duct sensor Since the opening limit value of the mixture door is determined by the limit value determining means based on the deviation from It is possible to prevent an increase in air temperature and avoid causing discomfort to the occupants.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a schematic diagram of an air conditioner, FIG. 2 is a main flowchart of the air conditioner, and FIG. 3 is a flowchart of mix door control. FIG. 4 is a diagram showing the control characteristics of the mix door, and FIG. 5 is a diagram showing the characteristics of the blowout temperature. 18...Mitsudoor, 20...Car interior, 21...
...Top air outlet, 54...Interior temperature sensor, 55
...Duct sensor, 56 ...Mode sensor, 57
... Temperature setting device, 58 ... Manual switch,
α ₁ , α ₂ ... Regulation value for mixer door opening.

Claims (1)

[Scope of utility model registration request] At least a vehicle interior temperature sensor that detects the temperature inside the vehicle, a duct sensor that detects the temperature of the air that has passed through the evaporator in the duct, and a temperature setting device that arbitrarily sets the vehicle interior temperature, and each of these sensors In a vehicle air conditioner, the opening degree of the mixer door is automatically controlled based on the output signal from the temperature setting device, and the opening degree of the mixer door is regulated when each blowout mode is manually operated. If at least the mode in which air is blown from the upper air outlet is selected by manual operation among the air blowing modes,
An air conditioner for a vehicle, comprising a regulation value determining means for determining a regulation value for the mixture door opening based on a deviation between a preset target blowout regulation temperature and a temperature detected by the duct sensor.