JPS58122213A - Air-conditioner for automobile - Google Patents

Abstract

PURPOSE:To improve the comfortableness both of a drivers seat and an assistant's seat by a method wherein the down stream part of an evaporator is divided respectively into air passages for a driver's seat and an assistant's seat, wherein each is provided with temperature regulator, and the temperature on the driver's seat side is lowered and that on the assistant's seat side is raised by a half of the difference between the flow-off air temperature of both seats. CONSTITUTION:The arithmetic control circuit 16 operates the target blow-off air temperature TA, the flow-off air temperatures at both seats TAR, TAL by the use of the open air temperature To, the room temperature Tr, the solar heat quantity ST, the preset temperature in the car room and the difference DELTAT between the temperature on the driver's seat and on the assistant's seat. At this time, TAR is designated to be lower by one half of DELTAT than TA, TAL is designated to be higher by one half of DELTAT than TA so that the difference between the blow-off air temperatures on both seats makes DELTAT. The apertures of the air mixing dampers 11, 13 are controlled by these designated blow-off air temperatures TAR, TAL. The fan 6 is controlled through the fan speed controller 30 so as to meat the target blow-off air temperature TA. In this structure, secure air-conditioning is kept in the car room to give comfortable conditions for the driver's and assistant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for a vehicle, and an object of the present invention is to provide an air conditioner that can set and blow air to a lower temperature only on the driver's seat side.

Conventional vehicle air conditioners typically blow out air conditioned air at the same temperature from left and right outlets on the driver's seat side and the passenger seat side, respectively. However, from the standpoint of vehicle safety, it is desirable to blow air-conditioned air at a temperature slightly lower than that of the passenger in the passenger seat for a nervous driver who is concentrating on driving operations. When blowing out conditioned air at the same temperature on the left and right sides like in a conventional air conditioner, the air velocity distribution near the heater core varies depending on the position of the air mix damper.
There is a considerable difference in the air outlet temperature between the driver's seat and the passenger's seat depending on the hot water distribution inside the heater core.
The height of this humidity difference is completely irregular, and the air outlet temperature on the driver's seat side becomes higher depending on the position of the air mix damper, or the air outlet temperature on the passenger's seat side becomes higher, and the air outlet temperature on the driver's seat side does not always reach the desired temperature. It was not possible to set the temperature to a low level and blow out the air.

The present invention solves the above-mentioned problems by providing a vehicle air conditioner having the configuration described in the claims, and is a state in which the air outlet temperature on the driver's seat side is lowered by a desired temperature than the air outlet temperature on the passenger seat side. This is an air conditioner for a vehicle that can be set to emit air.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a vehicle air conditioner according to the present invention, in which an outside air inlet 2 for taking in air from outside the vehicle and an inside air inlet 3 for taking in air from inside the vehicle are provided at the upstream end of the ventilation duct. These inlet ports 2 and 3 can be selectively switched by an inside/outside air switching damper 4. Immediately downstream of the inlet ports 2 and 3, a fan 5 is provided for blowing air sucked in through the inlet ports 2 and 3, and this fan 5 is rotationally driven by a fan motor 6. An evaporator 7, which is a cooling heat exchanger, is provided downstream of the fan 5, and forms a refrigeration cycle together with a compressor, a condenser, etc. (not shown). Furthermore, a partition plate 8 is inserted downstream of the evaporator 7 to divide the inside of the ventilation duct 1 into left and right halves, and divides the inside of the ventilation duct 1 into a right side ventilation passage 9 and a left side ventilation passage 10. There is.

Temperature adjustment mechanisms are provided in the left and right ventilation passages 9 and 10, respectively. It is composed of an air mix damper 11 that divides the air flow flowing through the right side ventilation passage 9 into two, and a heater core 12 that is a heating heat exchanger that heats one of the divided air flows, and the air flow is divided by the partition plate 8. The airflow flowing from upstream in the right side ventilation passage 9 is divided by the air mix damper 11 into a first airflow that is heated through the heater core 12 and a second airflow that bypasses the heater core 12. The air is mixed again on the downstream side of the air mix damper 11 to adjust its blowing temperature. That is, by changing the opening degree of the air mix damper 11 and adjusting the distribution ratio of the first and second air flows, the blowing temperature of the right side ventilation passage can be freely controlled. Further, the temperature control mechanism on the left side ventilation passage 10 is an air mixer, and as with the right side ventilation passage 9, the temperature adjustment mechanism on the left side ventilation passage 10 is controlled by adjusting the distribution ratio of the air flow by changing the opening degree of the air mix damper 13. The blowout temperature can be freely controlled. In addition, in the case of the illustrated example, the heater core 12
A single wide core is used that crosses the left and right ventilation passages 9 and 10, and the left and right sides of this core are used separately as heater cores dedicated to each ventilation passage. Engine cooling water (not shown) is supplied to the heater core 12 in a circulating manner as a heater heat source.

The air mix damper 11 is a damper actuator 1
4, and the air mix damper 13 is independently controlled to open and close by a damper actuator 15, and each damper actuator 14, 15 is separately commanded and controlled by an arithmetic control circuit 16, which will be described later.

A heater outlet 17, a vent outlet 18, and a defroster outlet 19 for the driver's seat side (right side), which blow out air-conditioned air into the vehicle interior, are opened in the most downstream device of the right side ventilation passage 9 of the ventilation duct 1. These air outlets 17, 18, 19
are selectively opened and closed by dampers 20 and 21, respectively.

Similarly, a heater outlet 22, a vent outlet 23, and a defroster outlet 24 for the passenger seat side (left side) are opened at the most downstream position of the left side ventilation passage 10 of the ventilation duct 1. The outlets 22, 23, 24 are dampers 25,
26, each of which is selectively opened and closed. Dampers 20 and 25 are supported coaxially, and dampers 21 and 26
are coaxially supported, and are controlled to open and close by damper actuators 27 and 28 that rotate their respective support shafts. Therefore, the left and right heater outlets 17 and 22, the left and right vent outlets 18 and 23, and the left and right defroster outlets 1
Reference numerals 9 and 24 respectively close or open the left and right sides at the same time. The damper actuators 27 and 28 are commanded and controlled by an arithmetic control circuit 16, which will be described later.

The left and right heater outlets 17 and 22 are generally provided below the instrument panel of an automobile, and are structured to blow out heating air toward the feet of left and right occupants seated. In addition, the left and right vent outlets 18.23 are generally provided on the left and right sides of the front of the instrument panel, and are structured to blow out conditioned air toward the upper bodies of the occupants on the driver's seat side and the passenger's seat side. There is.

These heater outlets 17, 22 and vent outlets are opened and closed.

Further, the left and right defroster outlets 19.24 blow air toward the front window of an automobile (not shown) to prevent fogging of the window.

This defroster outlet 19.24 is connected to the damper 21°26
selectively opened/closed or partially opened.

The arithmetic control circuit 16 is a circuit that controls each damper actuator 14, 15° 27, 28 according to instructions from the temperature setting device 29, and also controls a fan motor speed control device 30 that rotationally drives the fan motor 6. Generally, a microcomputer is used.

The temperature setting device 29 is provided on an air conditioning operation panel inside the vehicle interior, and is used to determine the humidity setting of the air conditioning inside the vehicle interior.

The arithmetic control circuit 16 includes an outside air sensor 31 that detects the outside air temperature To, and an inside air sensor 3 that detects the vehicle interior temperature Tr.
2. 'I'o and 'rr from the solar radiation sensor 33 that detects the solar radiation amount ST into the vehicle interior.

ST signal is input. The arithmetic control circuit 16 receives the outside temperature 〒01, the vehicle interior humidity Tr1, and the solar radiation ST, and adjusts the temperature of the vehicle interior to the air conditioning set temperature 'I'sm according to the following formula.
A target blowout temperature TA for maintaining the temperature at 'r is calculated.

TA - to 1-'I'5ET- to 2-T, - to 3-'I
', -4-8T10... (1) (However, 4 and C are constants for L target air outlet temperature TAB, and target air outlet temperature TA of the left air outlet, which is the air outlet on the passenger seat side.
L is calculated according to the following equations (2) and (9), respectively.

TAB -TA-△T/2 ・・・・・・・(2
)TAL ”””i'Aten△'I'/2...
・・・・・・(3) (However, △T is the desired temperature difference between the left and right outlets) 'I'ARjTA from the above formulas (2) and (3)
After determining L, the arithmetic control circuit 16 sets the damper actuators 14 and 15 that open and close the air mix dampers 11 and 13 to TAR and TAL, respectively, so that the blowout temperatures on the driver's seat side and the passenger seat side become TAB and TAL, respectively. A damper opening signal corresponding to TAL is given, and air mix damper 1 is
1 and 13 are moved to the opening position that provides the above-mentioned TAR=TAL. Further, the calculation control circuit 16 calculates the optimum fan speed corresponding to the target blowing temperature TA,
Based on the result, a control signal is output to the fan speed control device 30.

The fan speed control bag N 30 is composed of a well-known device such as a variable resistance device or a pulse speed control device, and controls the fan motor 6 so that the fan 5 reaches an optimum fan speed based on a control signal inputted from the arithmetic control circuit 16. It controls the

Fig. 2 shows a characteristic curve 1 showing the relationship between the target blowout temperature TA and the fan motor voltage v1 that provides the optimum fan speed.
Give an example. The relationship between TA and Vl is expressed by the following equation (4).

Vl −F (TA) −−−−−, −
(4) (However, F (x) indicates a function) The device of the present invention having the above configuration operates as described below, and realizes an air conditioning state having a desired temperature difference ΔT between the left and right outlet temperatures.

First, the calculation control circuit 16 reads the outside air sensor 31, the outside air temperature To1, the interior flow rate Tr%, and the amount of solar radiation ST, and calculates the target blowout temperature TA based on the above-mentioned equation (1).

Then, the target air outlet temperature TAB of the right air outlet, which is the driver's seat side air outlet, and the target air outlet temperature TAL, which is the passenger seat side air outlet, are calculated using the above-mentioned equation (2) r u).

Next, the damper opening degrees (damper positions) of the air mix damper 11 for the right side and the air mix damper 13 for the left side are adjusted so that the air outlet temperature of the right side air outlet and the air outlet temperature of the left side air outlet respectively become the target air outlet humidity TARITAL. ) is calculated. Now, the damper adjustment of the air mix damper 11 on the right side is SR1, and the patent characterized by the damper opening degree of the air mix damper 13 on the left side is SL = 02 (Th, h)...
...(6) (where G1-(x) and G2(X) represent functions). In addition, G1(x)
The specific functional form of and 02(X) is the shape of ventilation duct 1.

It is determined by the structure etc.

After determining the damper opening degrees sR and sL, the arithmetic control circuit 16 issues a command to the damper actuator 14 for the right side and the damper actuator 15 for the left side, and sets the air mix dampers 11 for the right side to the damper opening degree sB. , and set the air mix damper 13 for the left side to the damper opening degree sL. Furthermore, the arithmetic control circuit 16 operates so that the fan 5 rotates at the optimum fan speed corresponding to the target blowing temperature TA.
A control signal is provided to fan speed controller 30.

As a result, the fan speed control bag @30 applies a fan motor voltage v1 according to equation (4) (see the characteristic curve in FIG. 3) to the fan motor 6, and controls the fan 5 to the optimal fan speed at that time.

As a result of the above control, from the right side outlet, for example, the right side vent outlet 18, the outlet temperature TAR = 'I'A - △T/2
Air is blown toward the driver, and from the left vent outlet 23, which is the left outlet, the air is blown at a temperature TAL =
Air of TA10Δ'I'/2 is blown toward the front passenger seat occupant, and the blowing temperature on the driver's seat side is always kept lower than that on the passenger seat side by a set temperature difference ΔT. This temperature difference△
Of course, T can be freely changed to a desired value, but △T is not input from the temperature setting device 29;
It may be automatically set to a constant value from the beginning.

A flowchart of the operations described above is shown in FIG.

In the above operation description, the difference between the air outlet temperature TAB of the driver's seat side air outlet and the air outlet temperature TAL of the passenger seat side air outlet TAL TAR = △T, but if △T = O,
As with conventional air conditioners, it is also possible to easily set the left and right air outlet temperatures to be the same.

Conventional air conditioners have only one air mix damper, so there is a difference in the blowout temperature between the driver's seat and the passenger's seat due to the air flow velocity distribution near the temperature control mechanism, and this temperature difference is due to the air mix damper. If the opening degree changed, the driver's seat side would become higher or the passenger seat side would become higher, but according to the device of the present invention, when set to △T-0, even if the opening degree of the air mix damper changes. The blowout temperature on the driver's seat side and the passenger's seat side can be made exactly the same.

Therefore, for drivers who are sensitive to driving and require an air conditioner temperature slightly lower than that of the passenger seat passenger, it is possible to blow air at a desired temperature lower than the passenger seat side air blowing temperature. This is highly effective in providing comfortable air-conditioning conditions for both the driver and passenger seats. Furthermore, according to the present invention, due to a change in the opening degree of the air mix damper during air conditioning control, the air outlet temperature on the driver's seat side may become higher than the air outlet temperature on the passenger seat side, or the air outlet temperature on the passenger seat side may become higher than the air outlet temperature on the driver's seat side. This eliminates the need for air conditioning to become too expensive, and is highly effective in accurately achieving and maintaining the required air conditioning conditions.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the relationship with the structure of the vehicle air conditioner according to the present invention, and FIG. 3 is a flowchart of the operation of the device according to the present invention. 1:i[[Duct, 5:Fan, 6:Fan motor, 7
: Evaporator, 8: Partition plate, 9: Right side ventilation duct, 10:
Left side ventilation duct, 11: Air mix damper, '12: Heater core, 13: Air mix damper, 16: Arithmetic control unit, 17, 22: Left and right heater outlets, 18, 23:
Left and right vent outlets, 19, 24: Left and right defroster outlets, 30: Temperature setting device, 31: Outside air sensor, 32:
Inside air sensor, 33: solar radiation sensor, To=outside air temperature, Tr
= Vehicle interior temperature, ST: solar radiation, TSET: air conditioning set temperature, △T: difference in outlet temperature between left and right outlets, TA: target outlet temperature, TAR: outlet temperature at right outlet, 'I'AL: left outlet Outlet air temperature. (19) JP-A-58-122213 (6) Figure 2-) Figure 3

Claims (1)

[Claims] The inside of the ventilation duct on the downstream side of the evaporator is divided into two by a partition plate into a right side ventilation passage and a left side ventilation passage, and a temperature control mechanism consisting of an air mix damper and a heater core is installed in each of the left and right ventilation passages. At the most downstream end of the right side ventilation duct, various outlets are opened to blow out the air conditioned air to the driver's seat side, and at the most downstream end of the left side ventilation duct, the air conditioned air is blown out to the passenger side. Various outlets of the air outlet are opened, and the outside air sensor detects the outside air temperature, the inside air sensor detects the inside temperature of the car, the solar radiation setting device detects the amount of solar radiation into the inside of the car, and the outside air flow rate. , interior humidity 2
The target air temperature to obtain the air conditioning set temperature is determined based on the amount of solar radiation, and in order to make the air temperature on the driver's side lower by △T than the air air temperature on the passenger side, the air air temperature on the driver's side is determined. The opening degree of the air mix damper in the right side ventilation passage to be adjusted is set to 1/1 of the blowout temperature difference ΔT below the target blowout temperature.
The opening degree of the air mix damper in the left ventilation passage that adjusts the air outlet temperature on the passenger seat side is set to 1/2 of the air outlet temperature difference ΔT than the target air outlet temperature. An air conditioner for a vehicle, comprising: an arithmetic control circuit that sets the air outlet temperature to be higher by 2.