JPH04169321A - Control method of automatic air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To increase air conditioning effect of bi-level mode, in particular, for which turning is diffcult by calculating an aimed temperature of blown out air based at least on interior temperature, exterior temperature, and on a set temperature, and by determining a blowout mode according to the range of the aimed temperature of blown out air. CONSTITUTION:An aimed temperature TAO of air to be blown out is determined by a control unit 18 according to an expression TAO=K1TSET-K2TR-K3-TAM-K4TS +C, based on the information of interior temperature TR detected by a room temperature sensor 20, an exterior temperature TAM detected by an exterior sensor 21, the amount of solar radiation TS detected by a solar radiation sensor 22, and of a set temperature TSET set by a room temprerature setting part 19. When the aimed temperature of air to be blown out TAO is not less than a fixed level, a vent mode is selected and when it is not less than a first fixed level and less than a second fixed level which is larger than the first fixed level, a bi-level mode is selected, while a heat mode is selected when the aimed temperature is not less than the fixed level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of controlling an automatic air conditioner for a vehicle.

Conventional technology The required blowout temperature is determined by inputs from various sensors such as an outside air sensor that detects the outside temperature, a room temperature sensor that detects the indoor temperature, and a solar radiation sensor that detects the amount of solar radiation, as well as the room temperature setting unit that sets the target temperature. An air mix door opening method that calculates the opening degree of the air mix door from the required blowout temperature calculation means, the suction temperature calculation means based on input from the suction temperature sensor and the compressor operation detection sensor, and the required blowout temperature calculation means and the suction temperature calculation means. The indoor temperature is controlled to the temperature set by the indoor temperature setting device using a control amplifier consisting of a temperature calculation means and a comparison means for comparing the output of the air mix door opening degree calculation means and the input from the potentio balance register. Automatic air conditioners for vehicles have already been developed and are widely used (for example,
(See Publication No. 05218).

Problems to be Solved by the Invention Auto air conditioners have two normal modes: a heat mode in which only the lower outlet is opened and warm air is blown out to the passenger's feet, and a heat mode in which both the upper and lower outlets are opened to blow out relatively cold air. A so-called bi-level mode in which relatively warm air is blown towards the occupant's upper body and at the same time relatively warm air is blown towards the occupant's feet to keep the head cold and feet warm. It has three modes, but the middle range bi-level mode is difficult to handle. In other words, if there is sunlight, you will want cold wind from above even if the outside temperature is quite low (e.g. around 0℃), and if there is no sunlight, you will want cold air from above even if the outside temperature is in the middle range (e.g. 10 to 20℃). They tend to dislike the wind.

The present invention aims to deal with the bilevel mode, which is difficult to tune as described above.

Means for Solving the Problems The present invention includes at least a room temperature sensor that detects an indoor temperature TR and an outside air sensor that detects an outside air temperature TAM.
From the detected values of the sensors and the information on the set temperature TSET set in the room temperature setting section, set the target outlet air temperature TAO to TAO = +Ts[r- to 2TR- to 3TA14 +C
(However, K1, K2.K3 are coefficients, and C is a constant.) When the target air temperature TAO is less than the first predetermined value, cold air is blown toward the upper body of the occupant. When the target air temperature TAO is equal to or higher than a first predetermined value and less than a second predetermined value that is larger than the first predetermined value, relatively cold air is blown toward the upper body of the occupant. At the same time, a bilevel mode is set in which relatively warm air is blown toward the occupant's feet, and when the target air temperature TAG is equal to or higher than the second predetermined value, a heat mode is set in which warm air is blown toward the occupant's feet. In a vehicle auto air conditioner equipped with a control unit that performs control, the outside air temperature TAM of the above formula when in bilevel mode.
This mode is characterized in that the coefficient of 3 is made larger than in other modes, and the constant C is changed accordingly.

As a result of the above operations, it is possible to control the temperature in accordance with the expectations of the occupants, who want to quickly switch to the warm heat mode HEAT when the outside air temperature TAM is dropping and it is getting cold, and to quickly switch to the cool vent mode VENT when the outside air temperature TAM is rising. In addition, in order to bring about the same effect, it is possible to prevent the occurrence of mode hunting that tends to occur when the temperature range of the target blowout temperature TAO that is 1" B/L is narrowed to 4 to 5 degrees Celsius. .

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

In FIG. 1, 1 is an internal/external air switching shutter, 2 is a blower, 3 is an evaporator, and 4 is a heater core through which hot water flows after cooling the engine, and the air flow rate flowing through the heater core 4 and the air bypassing the heater core 4 are The ratio to the flow rate is variably controlled by the opening degree of the air mix shutter 5. 6 is a vent shutter, 7 is a heat shutter, 8 is a defrost shutter, 9 is an upper air outlet, 10 is a lower air outlet, and 11 is a defrost air outlet.

The inside/outside air switching shutter is a servo motor 12 for changing inside/outside air.
The air mix shutter 5 is opened and closed by the air mix servo motor 13, and the vent shutter 6, heat shutter 7, defrost shutter 8, etc. are switched by the air outlet switching servo motor 14. These servo motors 12, 13 and 14 are simply referred to as actuators.

15 is a blower relay for controlling blower 2 on and off, 1
Reference numeral 6 denotes a blower voltage control section including a power transistor or the like that variably controls the blower rotation speed by changing the voltage applied to the blower; 17 an extra high relay connected in parallel with the blower voltage control section 16; When the relay 17 is turned on, the blower voltage is at its highest.

Reference numeral 18 denotes a control unit, and the control unit 18 is provided with a room temperature setting section 19, which controls the indoor temperature TR detected by the room temperature sensor 20, the outside air temperature TAM detected by the outside air sensor 21, and the solar radiation detected by the solar radiation sensor 22. Based on the information on the amount Ts and the set temperature TSET set in the room temperature setting section 19, the target outlet air temperature TAO is set to TAO=KITSEI-, for example, by 2TR-KzTAT4-Ka.
Ts+C・・・・・・・・・・・・・・・ It is determined by the formula (1), and based on the determined value of TAO, the cooling operation is controlled, the blower voltage is controlled, and each shear 7 is controlled by various actuators. It automatically controls the indoor temperature to approach the set temperature T S [, however, in equation 1), K 1, K 2. K 3
．． K a is a coefficient and C is a constant.

FIG. 3 shows an example of how the control unit 18 controls the blower voltage and the outlet mode.

That is, the range A to C where the target air temperature TAo is on the negative side is cooling, the range D-F on the positive side is heating, and the blower voltage is Hi in the range A to B and the range E-F. C
-D range is controlled to change from Lo, and B-C and E-D (7) ranges are controlled to change continuously or stepwise from Hi to Lo.

The air outlet mode is upper air outlet 9 when TAO is in the range of A-C.
In the open state, the vent mode is set in which cold air is blown mainly toward the upper body of the occupant, and in the range C-D, both the upper outlet 9 and the lower outlet 10 are opened, and relatively cool air is directed toward the upper body of the occupant. At the same time, relatively warm air is blown toward the feet of the occupants to prevent head cold and feet heat, which is a so-called bilevel mode, and only the lower air outlet 10 is opened from the positive side of the C-D range to the D-F range. Heat (heating) that blows warm air to the feet of the passengers.
mode.

In addition, when the TAO is in the A-B range and F-H range, the inside/outside air switching shutter l is switched to internal air circulation to promote cool-down and warm-up, and in the B-C range and E-D range, the internal/external air switching shutter l is switched to internal air circulation. Control is carried out to switch the inside/outside air switching shutter 1 so as to take in both outside air so that a certain amount of ventilation can be achieved without reducing the heating and cooling effect too much, and to switch the inside/outside air switching shutter 1 to bring in outside air in the range C-D. conduct.

Further, the opening degree of the air mix shutter 5 is determined by calculation based on the evaporator outlet air temperature TE detected by the evaporator sensor 23 and the target outlet air temperature TAO.

In the above, in the present invention, the coefficient of the outside air temperature TAM in the equation (1) that determines the target outlet air temperature TAo by calculation in the bilevel mode is set to 3, which is larger than in other modes, and accordingly, in other modes This feature is characterized in that the constant C is changed so that no deviation occurs at the connection point with the .

That is, in the above equation (1), set temperature TSET is 25°C, solar radiation "rs" is O1, each coefficient K 1, K 2.K 3.K 4
5.1, 0.8, 0, and the constant C is io. When the outside air temperature TAM is between 0°C and 10°C, the coefficient of the outside air temperature TAM is 3 to 1.2, and the constant C is is 14, the outside air temperature T with the indoor temperature TR as a parameter
The target outlet air temperature TAG for AH can be expressed as shown in FIG.

In the above, in the conventional control method in which the coefficient 3 for the outside air temperature TAM is set to 0.8 over the entire range of the outside air temperature TAH, the transition occurs along the dotted line in Figure 2, and when the outside air temperature TAM is about -5°C, the heat The mode switches to HEAT. If it takes about 1 hour for the outside air temperature TAM to cool down from 10°C to -5°C, the bilevel mode B/L will be approximately 1 hour curve, whereas in this control method, the solid line in Figure 2 , and switches to heat mode HEAT when outside temperature TAM is 0℃, so bi-level mode B/L
This means that the time it takes to maintain the heat mode is only 40 minutes, which is approximately 40 minutes compared to 1 hour using the conventional control method, which increases the expectation (fee) of the occupants to switch to the warm heat mode HEAT quickly when the outside temperature TAM falls. ring).

Contrary to the above, when the outside air temperature TAM rises, the conventional control method shifts along the dashed line in FIG. 2 and switches to the vent mode VENT when the outside air temperature TAM is 15°C. In this control method, the outside air temperature TAM is 1
Since the vent mode VENT switches to the vent mode when the temperature is 0°C, the occupant's expectation (feeling) is to quickly switch to the cool vent mode VENT when the outside temperature TAM rises.
It can be adjusted to

By adopting the above-described control method, the present invention satisfies the expectations of the occupants to quickly switch to the warm heat mode HEAT when the outside air temperature TAM is decreasing and it becomes cold, and to quickly switch to the cool vent mode VENT when the outside air temperature TAM is rising. In order to not only make it possible to control the temperature according to the user's feeling, but also to bring about the same effect, the temperature range of the target blowing temperature TAO that becomes the level mode B/L is set to 4
Mode hunting, which tends to occur when the temperature is as narrow as ~5°C, can be prevented.

Effects of the Invention As described above, according to the present invention, at least the indoor temperature T
Equipped with a room temperature sensor that detects R and an outside air sensor that detects outside air temperature TAM, the target outlet air temperature T is determined from the detected values of the sensors and the information on the set temperature Ts set in the room temperature setting section.
AG to TAO=KITSET- to 2TR- to 3TAM
+G (where K1, K2, K3 are coefficients, C is a constant), and when the target outlet air temperature TAO is less than the first predetermined value, cool air is directed towards the upper body of the occupant. When the target air temperature TAG is equal to or higher than a first predetermined value and less than a second predetermined value that is larger than the first predetermined value, relatively cold air is blown toward the upper body of the occupant. At the same time, a bilevel mode is set in which relatively warm air is blown toward the occupant's feet, and a heat mode is set in which warm air is blown toward the occupant's feet when the target air temperature TAO is equal to or higher than the second predetermined value. In a vehicle auto air conditioner equipped with a control unit that performs control, when in bilevel mode, the coefficient of outside temperature TAM in the above formula is set to 3, which is larger than when in other modes, and the constant C is changed accordingly. By doing so, it becomes possible to control the temperature according to the expectations of the occupants, who want to quickly switch to the warm heat mode HEAT when the outside air temperature TAM is dropping and it is getting cold, and to quickly switch to the cool vent mode VENT when the outside air temperature TAM is rising. In addition, in order to bring about the same effect, the temperature range of the target blowout temperature TAO, which is the bilevel mode B/L, is set to 4 to 4.
This can prevent mode hunting, which tends to occur when the temperature is as narrow as 5° C., and can have a great practical effect.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention. Fig. 1 is an explanatory diagram showing a structural example of an automatic air conditioner device, and Fig. 2 shows an example of the indoor temperature T.
A characteristic diagram of the target outlet air temperature TAo with respect to the outside air temperature TAH with R as a parameter. FIG. 3 is a diagram showing an example of control characteristics of the blower voltage and outlet mode with respect to the target outlet air temperature TAG. 1...Inside/outside air switching shutter, 2...Blower, 3...
・Evaporator, 4... Heater core, 5... Air mix shutter, 6... Vent shutter, 7... Heat shear 7, 8... Defrost shutter, 12゜13.14... Actuator, 18... Control unit, 19... Room temperature setting section, 20... Room temperature sensor,
21... Outside air sensor, 22... Solar radiation sensor, 23.
... Ehaphorator sensor. that's all

Claims (1)

[Claims] At least a room temperature sensor that detects indoor temperature T_R and an outside air sensor that detects outside temperature T_A_M are provided, and the set temperature T set by the detected value of the sensors and the room temperature setting section is provided.
A target blowout air temperature T_A_O is determined from the information of _S_E_T using the following formula, and when the target blowout air temperature T_A_O is less than a first predetermined value, a vent mode is set in which cold air is blown toward the upper body of the occupant, and the above-mentioned Target outlet air temperature T_A_O
is greater than or equal to a first predetermined value and less than a second predetermined value greater than the first predetermined value, relatively cold air is blown toward the upper body of the occupant, and at the same time relatively warm air is blown toward the occupant's feet. Bi-level mode that blows out towards the target,
In a vehicle auto air conditioner equipped with a control unit that performs control to enter a heat mode in which warm air is blown at the feet of an occupant when the target blowout air temperature T_A_O is equal to or higher than the second predetermined value, the vehicle auto air conditioner is equipped with a control unit that performs control such that warm air is blown at the feet of an occupant. A method for controlling an auto air conditioner for a vehicle, characterized in that the coefficient K_3 of the outside air temperature T_A_M in the equation is made larger than in other modes, and the constant C is changed accordingly. T_A_O=K_1T_S_E_T-K_2T_R-K
_3T_A_M+C (However, K_1, K_2, K_3 are coefficients, and C is a constant.)