JP2964600B2 - Automotive air conditioners - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automotive air conditioner.

(Background technology)

Immediately after starting the operation of the air conditioner at the time of high temperature, especially in the summer, when parked under the scorching sun in a car, the warm air which had stayed in the ventilation duct until then blows out into the room, and it is very uncomfortable. is there. In such a case, since the evaporator is not sufficiently cooled, sweat, tobacco, and residual odor of the fragrance and the like adhering to the outer wall of the evaporator are included in the blown-out warm air. It is known to give. For this reason, in the related art, a blower (Blower: blower) is stopped until a predetermined time elapses, and blowing is started after the predetermined time elapses (for example, Japanese Utility Model Publication No. 47-42351) or a thermoswitch. It has been proposed that the blower be stopped until the evaporator reaches a predetermined temperature by the output of (1), and the evaporator be lowered to the predetermined temperature and start the post-ventilation (for example, Japanese Utility Model Publication No. 55-31466).

On the other hand, when the heater is used, the temperature of the cooling water is low immediately after the engine is started at a low temperature, particularly in winter, so that when the blower is operated, the cool air blows out and the cold increases further. Had to be stopped.

[Problems to be solved by the invention]

However, in any of the above cases, since the method of stopping the blower for a certain period of time is employed, air stays in the ventilation duct, and the air remains at a high temperature at a high temperature. However, at the time of low temperature, the staying air is kept low at the same time when the blower is operated.
There is a disadvantage that the blower is blown into the passenger compartment, and in order to prevent this, the blower cannot be operated for a relatively long time until the staying air is sufficiently heated or cooled by the heater or the evaporator. That is, there is a disadvantage that the air blowing into the room cannot be started.

[Object of the invention]

The object of the present invention is to improve the disadvantages of the conventional example, and to prevent the blowing of hot air immediately after the start of use of the air conditioner at a high temperature and the blowing of cool air immediately after the start of use of a heater at a low temperature, and in an appropriate state. It is an object of the present invention to provide an air conditioner for a vehicle which can shorten the time until the start of blowing air into a room.

[Means for solving the problem]

The present invention provides a blower unit in which an outside air introduction passage and an inside air introduction passage are provided on the suction side of a blower, an evaporator unit having one end connected to the blowout side of the blower unit, and another end connected to the evaporator unit. And a heater unit. The blower unit has an inside / outside air switching door.

Further, the heater unit, on the upstream side thereof, a heating region having a heater core for heating air from the evaporator unit, a bypass region for bypassing air from the evaporator unit, and a heating region for heating air from the evaporator unit. It has an air mix door for distributing to the bypass area, and, on the downstream side of the heater unit, a mixing area for mixing the air from the heating area and the air from the bypass area, and a plurality of communication sections connected to the downstream side of the mixing area. A vehicle interior air outlet; and a mode door for selecting a vehicle interior air outlet through which air in the mixing area is sent.

Furthermore, a first bypass passage communicating the heating region and the outside air introduction passage, and a second bypass passage communicating the bypass region and the inside air introduction passage are provided,
Each of the bypass passages has a first passage opening / closing door for switching the flow of air from the heating region between the first bypass passage and the mixing region, and the second passage for controlling the flow of air from the bypass region. A second passage opening / closing door for switching between the passage side and the mixing area side is provided, thereby achieving the object described above.

That is, at the stage immediately after the start of use of the heater at a low temperature, that is, at the stage before the heater core is sufficiently warmed, the first passage opening and closing is performed so that the air flow from the heating region is switched to the first bypass passage side. By operating the door, it is possible to prevent cold air from being blown out of the vehicle interior outlet, and at the stage immediately after the start of use of the air conditioner at high temperature, that is, at the stage before the air in the evaporator unit is sufficiently cooled, the bypass region By operating the second passage opening / closing door such that the flow of air from the vehicle is switched to the side of the second bypass passage, it is intended to prevent hot air from being blown out from the vehicle interior outlet.

Further, according to this configuration, in a state where the first passage opening / closing door is operated such that the flow of air from the heating area is switched to the first bypass passage side, the air taken in from the blower unit is The circulation operation such as taking in from the evaporator unit again through the evaporator unit and the overheating region and the first bypass passage is repeated, and during this time, the air in the ventilation duct is warmed. As a result, an appropriate heating operation can be started immediately as compared with a conventional automotive air conditioner in which the air is stopped in the ventilation duct. Similarly, in a state where the second passage opening / closing door is operated so that the flow of air from the bypass region is switched to the second bypass passage side, the air taken in from the blower unit is connected to the evaporator unit. The circulation operation such as being taken in from the blower unit again through the bypass area and the second bypass passage is repeated, and during this time, the air in the duct of the passage system is cooled, so that the blower is stopped at the start of operation. As a result, an appropriate cooling operation can be promptly started as compared with a conventional automotive air conditioner in which air stays in a ventilation duct.

Furthermore, first temperature detecting means for detecting the air temperature downstream of the heating area, second temperature detecting means for detecting the air temperature downstream of the evaporator, and
A first actuator for operating the first passage opening / closing door and a second actuator for operating the second passage opening / closing door are provided, and the first temperature detecting means detects an air temperature lower than a set temperature. During the detection, the drive of the first actuator is controlled so as to switch the flow of air from the heating area to the first bypass passage side, and the second temperature detection unit controls the air temperature higher than a set temperature. A preparatory operation for heating and cooling is provided by providing control means for driving and controlling the second actuator so as to switch the flow of air from the bypass region to the side of the second bypass passage while detecting the temperature. And automated proper cooling and heating operations.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The embodiment shown in FIG. 1 includes a blower unit 1 and
An evaporator unit 2 having one end (the left side in the drawing) connected to the blowing side (the right side in the drawing) of the blower unit 1 and a heater unit 3 connected to the other end (the right end in the drawing) of the evaporator unit 2.
And

The blower unit 1 includes a blower case 4
The blower case 4 has a blower 5 having a blower motor 5A housed therein. The blower case 4 is bifurcated and opened on the suction side (lower side in the figure) of the blower 5, one of which constitutes an inside air introduction passage 6 connected to a vehicle interior (not shown), and the other being outside the vehicle (not shown). The connected outside air introduction passage 7 is formed. In addition, an intake door 8 as an inside / outside air switching door is provided in the forked portion, and when the intake door 8 is at an inside air circulation position shown by a solid line in the drawing, the inside air introduction passage 6 side is opened, Further, the inside air is selected by closing the outside air introduction passage 7 side. When the inside air is at the outside air introduction position shown by the two-dot chain line in the figure, the inside air introduction passage 6 side is closed and the outside air introduction passage 7
Open the side and select the outside air. The intake door 8 is connected to the actuator 14 via a link mechanism (not shown).
A (see FIG. 2), this actuator 14A
For example, a known motor having a built-in motor, the intake door 8 is moved by the actuator 14A.

The evaporator unit 2 includes an evaporator case 9 and an evaporator 10 housed in the evaporator case 9. The evaporator case 9 has one end opening connected to the blower case 4 of the blower unit 1 and the other end opening connected to the case 11 of the heater unit 3. Also, evaporator 10
Is connected to a compressor 12 and other devices by piping to form a cooling cycle. The compressor 12 is connected to an engine (not shown) via a magnet clutch 13, and is controlled on / off (ON / OFF) by the magnet clutch 13. It has become so.

The heater unit 3 includes a heater case 11, a heating area in the heater case 11, that is, a heater core 15 housed in an upper half portion in the figure, and an air mixing door 16 provided near a front portion of the heater core 15. It is comprised including. The lower half of the heater case 11 is a bypass area. In the present embodiment, in the downstream side of the air mixing door 16 of the heater case 11, that is, in the mixing region where the air from the heating region and the air from the bypass region are mixed again, in the present embodiment, the heat outlet which is the vehicle interior outlet is provided. 17, a vent outlet 18 and a mode door 19 for switching the outlet. The heat core 15 forms a part of a cooling water circulation cycle in which the cooling water of the engine circulates, and is heated as the cooling water temperature increases. The air mix door 16 adjusts the mixing ratio of the air sent to the heater core 15 and the air bypassing the heater core 15 according to the opening degree. Then, the air mixed again in the mixing area located on the downstream side is blown into the vehicle interior from the vent outlet 18 or the heat outlet 17 according to the selection of the mode door 19. Here, similarly to the intake door 8, the air mix door 16 is also rotated by an actuator 14B via a link mechanism (not shown). In this embodiment, switching of the mode door 19 is performed by a so-called manual operation.

Further, in the present embodiment, the first bypass passage 21 that communicates the downstream side of the heating region where the heater core 15 of the heater unit 3 is located with the outside air introduction passage 7 and the bypass region in the lower half of the heater case 11 described above. And a second bypass passage 22 that communicates the downstream side of the inside air passage 6 with the inside air introduction passage 6. At the entrance of the first bypass passage 21, a first passage opening / closing door 23 for switching the flow of the air passing through the heating region having the heater core 15 between the bypass passage 21 side and the downstream mixing region side is provided. And the second bypass passage
A second passage opening / closing door 24 is provided at the entrance of the passage 22 to switch the flow of the air passing through the bypass region by bypassing the heater core 15 between the bypass passage 22 and the downstream mixing region. These passage opening / closing doors 23 and 24 are also rotated by a first actuator 14C and a second actuator 14D via a link mechanism (not shown). Further, in the vicinity of the downstream side of the evaporator 10, the evaporator 10 downstream of the air temperature T ₁ is the set temperature, for example, becomes 35 ° C. or less, the "ON (ON)" Temperature switch for outputting a signal (second temperature detection Means) 25, and in the vicinity of the downstream side of the heater core 15,
A temperature switch that outputs an “ON” signal when the downstream air temperature T ₂ exceeds a set temperature, for example, 20 ° C.
Temperature detecting means) 26 are provided.

Next, the control system of the present embodiment will be described with reference to FIG.

In this figure, a main controller 30 (including a microcomputer and the like) includes a blower switch (hereinafter, referred to as a blower switch).
"Blower SW" 31, Air conditioner switch (hereafter,
Signals from an “air conditioner SW” 32 and temperature switches 25 and 26 are input. Blower SW32
Commands the drive of the blower 5 and its rotation speed,
The SW 32 instructs driving of the compressor 12.

The main control device 30 performs a logical operation on signals from the blower SW31, the air conditioner SW32, and the temperature switches 25 and 26, amplifies the signals, and amplifies the signals via the blower motor 5A, the magnet / clutch 13 of the compressor 12, and the actuator drive circuit 33. The control signal is output to the controller.

FIG. 3 shows main control operations of main controller 30 in the present embodiment.

In the CPU (not shown) of the main control device 30, first, at the same time as the control starts, the blower SW31 and the "ON (ON) / OFF (OFF)"
(Step S101), and returns to the start when the blower SW31 is “OFF”, and when the blower SW31 is “ON”, the CPU determines “ON / OFF” of the air conditioner SW32 (S102). If the air conditioner SW 32 is “OFF”, it is determined that the heater is being used, and the process proceeds to step S 108, and a control signal is output to the actuator drive circuit 33 and the blower motor 5 A to fully open the heater and operate the blower 5. . Thereby, the air mix door 16 is moved to the position where the heater is fully opened (the position indicated by the two-dot chain line in FIG. 1), and the blower 5 is operated. Next, the CPU immediately determines “ON / OFF” of the temperature sensor 26,
The heater core 15 the temperature T ₂ of the downstream air is determined whether it exceeds the set temperature (S109). When the temperature T ₂ does not exceed the preset temperature, the process proceeds to step S110, first
Then, a predetermined control signal is output to the actuator drive circuit 33 to open the intake door 8 and select the outside air side (S105). This allows
The actuator 14A moves the intake door 8 to the outside air selection position, and the first passage opening / closing door 23 opens the first bypass passage 21 to block the air downstream of the heater core 15 (the position indicated by the solid line in FIG. 1). ). As a result, the air staying in the evaporator case 9 is released by the operation of the blower 5 to the outside air introduction passage 7.
After passing through the heater core 15 together with the air taken in from outside the vehicle via the outside, the air flows into the first bypass passage 21, and after passing through the bypass passage, together with outside air, the
After that, it passes through the evaporator case 9 again and passes through the heater core 15. In this way, the air is discharged from the evaporator case 9 → the heater core 15 → the first bypass passage 21 → the blower case 4 → the evaporator case 9
It is warmed up by the route. In this way, when the temperature T ₂ of the air downstream of the heater core 15 reaches the set temperature with the rise of the cooling water temperature, and the determination in step S109 becomes `` yes '', the CPU outputs a control signal to the actuator drive circuit 33, The first bypass passage 21 is closed. (S111).

On the other hand, if the determination in step S102 is YES, the CPU determines that the air core is being used and proceeds to step S103, in which the actuator drive circuit 33 and the blower motor 5A are operated to fully open the heater and operate the blower 5. Outputs control signal. As a result, the air mix door 16 is moved to the heater fully closed position (the position indicated by the solid line in FIG. 1), and the blower 5 operates. Next, in the CPU, the magnet clutch 1 of the compressor 12
And outputs the ON signal to start driving the compressor 12 to 3 (S104), immediately by judging "ON · OFF" temperature sensor 25, the evaporator 10 the temperature T ₁ of the downstream air reached the set temperature It is determined whether or not the temperature is lower than the set temperature. When the temperature T ₁ is not reached the set temperature, with opening the second bypass passage 22, and outputs to the actuator driving circuit 33 a predetermined control signal to selectively causing the room air by the intake door 8 (S106). Thereby, the intake door 8 is moved to the inside air selection position by the actuator 14A, and the second passage opening / closing door 24 opens the second bypass passage 22 to block the air downstream of the evaporator 10 (first position).
(The position shown by the solid line in the figure). As a result,
The air remaining in the evaporator case 9 passes through the evaporator 10 together with the air taken in from the vehicle interior through the inside air introduction passage 6 by the operation of the blower 5, and then the first air flows.
After passing through the bypass passage 21, the air is taken into the blower case 4 together with the inside air, and then passes through the evaporator case 9 again. In this way, the air is cooled through the path of the evaporator case 9 → the second bypass passage 22 → the blower case 4 → the evaporator case 9. In this way, the evaporator 10 downstream of the temperature T ₁ of the air reaches the set temperature as the temperature drop of the evaporator, when the determination in step S105 is "yes", the actuator drive circuit 3, CPU
Then, a control signal is output to 3 to close the second bypass passage 22 (S107).

In any of the above cases, after the set temperature is reached, warm air or cool air is blown from the heat outlet 17 or the vent outlet 18. After that, the same heating or cooling control as usual is performed.

As described above, according to the present embodiment, the evaporator case 9 is provided by using the first and second bypass passages 21 and 22.
Since the inside air is reheated during heating and recooled during cooling, in any case, the evaporator case 9 can be operated in a shorter time than in the conventional case where the blower is stopped for a certain period of time. The air in the appropriate heating temperature,
Until the cooling temperature can be reached, and until the temperature is reached, air is not blown out from the vehicle interior air outlet. The blowing of cold air immediately after the start of use of the hour heater can also be prevented. Further, when the blowout of the cool air from the vent outlet 18 is started when the air conditioner is used, the temperature of the evaporator is sufficiently lowered, and the odor source causing the odor is caught by the condensed water of the evaporator, so that the air is blown. There is no bad smell in the air.

In the above embodiment, the temperature switch detects that the temperatures T ₁ and T ₂ reach the set temperature, and the main controller opens and closes the first and second bypass passages based on the output signal of the temperature switch. Although the case of performing is exemplified, the present invention is not limited to this. For example, a timer circuit or the like that finds an approximate time to reach the set temperature in advance by experiment or the like and outputs a control signal after the elapse of the time has been found. It is also possible to use such a configuration that the blowing from the vehicle interior blowing outlet is started. Also, although it is somewhat troublesome, mode door 19
Similarly, the first passage opening / closing door is manually operated.
By operating the door 23 and the second passage opening / closing door 24, it is possible to carry out the intended purpose, that is, prevention of careless blow of cold air or hot air and early optimization of the temperature of heating or cooling. . In the above-described embodiment, the hot air outlet is typically exemplified by the heat outlet 17. However, in practice, it is desirable to provide a plurality of outlets such as a foot outlet and a defrost outlet.

[Effects of the Invention] As described above, according to the present invention, the first unit that connects the downstream side of the heating area of the heater unit with the outside air introduction passage is provided.
And a second bypass passage communicating between the downstream side of the bypass region of the heater unit and the inside air introduction passage, and the bypass passages allow the flow of air to flow into the respective inlets. The structure has a passage opening / closing door for switching between the side and the mixing area side of the heater unit. Therefore, when the heater is used, the evaporator unit using the first bypass passage,
The air staying in the ventilation passage such as a blower unit can be heated again.
By using the bypass passage, it is possible to re-cool the warm air remaining in the ventilation path, and in any case, compared to the conventional case where the blower is stopped for a certain period of time, The air in the ventilation passage can be brought to the appropriate heating temperature and cooling temperature, and, for example, the passage opening / closing door is controlled until the temperature of the blown air reaches a predetermined set temperature by microcomputer control as exemplified in the above embodiment. Is set on the side of the bypass passage, it is easy to stop blowing air from the vehicle interior outlet until the set temperature is reached. Therefore, it is possible to provide an unprecedented excellent automotive air conditioner that can prevent the blowing of hot air immediately after the start of use of the high-temperature air conditioner and the blowing of cool air immediately after the start of use of the low-temperature heater, which have conventionally been problems. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a control system of the embodiment of FIG. 1, and FIG. 3 is a flowchart showing a main control program of a main control device. It is. DESCRIPTION OF SYMBOLS 1 ... Blower unit, 2 ... Evaporator unit, 3 ... Heater unit, 5 ... Blower, 6 ... Inside air introduction passage, 7 ... Outside air introduction passage, 8 ... Intake door as inside / outside air switching door, 15 ... heater core, 16
…… Air mix door, 17… Heat outlet, which is a vehicle interior outlet, 18… Vent outlet, which is a vehicle interior outlet, 19
... A mode door, 21 a first bypass passage, 22 a second bypass passage, 23, 24 a passage opening / closing door.

Claims (2)

(57) [Claims] 1. A blower unit having an outside air introduction passage and an inside air introduction passage provided on the suction side of a blower, an evaporator unit having one end connected to the blowout side of the blower unit, and connected to the other end of the evaporator unit. The blower unit has an inside and outside air switching door,
The heater unit has, on its upstream side, a heating region having a heater core for heating air from the evaporator unit, a bypass region for bypassing air from the evaporator unit, and heating the air from the evaporator unit. An air mixing door that distributes the air from the heating area and the air from the bypass area, and a downstream side of the mixing area. A plurality of vehicle interior air outlets, and a mode door for selecting a vehicle interior air outlet for feeding air in the mixing area, wherein the air conditioner for a vehicle has a mode door for communicating the heating area with the outside air introduction passage. A first bypass passage, a second bypass passage communicating the bypass region with the inside air introduction passage, and A first passage opening / closing door for switching a flow of air from the heating region between the first bypass passage side and the mixing region side; and a flow passage of air from the bypass region to the second bypass passage side. And a second passage opening / closing door for switching to the mixing area side. 2. A first temperature detecting means for detecting an air temperature on a downstream side of the heating area, a second temperature detecting means for detecting an air temperature on a downstream side of the evaporator, and the first temperature detecting means. A first actuator for operating the passage opening and closing door and a second actuator for operating the second passage opening and closing door, and the first temperature detecting means detects an air temperature lower than a set temperature. During this time, the first actuator is drive-controlled so as to switch the flow of air from the heating area to the first bypass passage side, and the second temperature detecting means sets an air temperature higher than a set temperature. Control means for controlling the driving of the second actuator is provided to switch the flow of air from the bypass region to the side of the second bypass passage during detection. The automotive air conditioner according to claim 1, wherein