JPH02220916A - Air conditioning system for automobile - Google Patents

Abstract

PURPOSE:To prevent the overheating of an engine by providing an air blowing means, auxiliary radiator common to heater unit, fresh air introducing port, and an exterior exhausting port, to switch over dampers when the engine is overheated, whereby the introduced fresh air may be exhausted out of a car through the heater unit. CONSTITUTION:When an air conditioning system is in, for example, heating mode, dampers 15 to 17 are positioned as shown in the figure by full line and a heater unit 6 and fan 14 are operated. Accordingly, the air is passed through an interior air inlet port 11 and a heater unit 6, in which it is heated, and exhausted in the interior of a car from an exhausting port 9. When it is in cooling mode, the dampers 15 to 17 are switched over to pass the air through a cooler unit 7. When an engine is overheated, it is switched over to the emergency cooling mode to switch over dampers 15 and 17 to the fresh air introducing line 12 open position and the exhausting line 13 open position, respectively, whereby the heater unit 6 is cooled by the introduced fresh air. Thus the overheating of the engine can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an air conditioning system for an automobile, and more particularly to an air conditioning system for an automobile having an overload prevention function.

(Prior Art) A conventional air conditioning system for an automobile has a basic configuration as shown in FIG. That is, the cooler unit d and the heater unit e are arranged in series in the middle of a ventilation path C that communicates the inside air intake port a and the inside air outlet s. Further, an outside air introduction path f is joined to the upstream side of the ventilation path C, and a blower fan g is arranged downstream of the merging position of the outside air introduction path f. Further, a damper h is provided near the confluence of the outside air introduction passages f to switch the ventilation route. Then, during cooling, heating, and dehumidification, the damper h is switched as shown by the solid line to flow the indoor air as indicated by the solid line, and at the same time, only the cooler unit d is used for cooling, only the heater unit e is used for heating, and the cooler unit d and the heater are used for dehumidification. This is done by simultaneously operating unit e. Furthermore, when outside air is introduced into the vehicle, the damper is switched to the state shown by the two-dot chain line, and the outside air is caused to flow into the state shown by the broken line.

In this way, the conventional air conditioning system has a configuration in which the cooler unit d and the heater unit e are installed in the same ventilation path C, and the wind that has passed through the ventilation path C can be discharged to the outside of the vehicle. Not yet.

For this reason, the heater unit e could not be used as an emergency auxiliary radiator in case of overheating.

(Problems to be Solved by the Invention) As described above, conventional air conditioning systems cannot contribute equally to engine cooling. For this reason, the radiator size had to be made large because the radiator size was set assuming all driving conditions and outside temperature conditions. In addition, despite this, there is a problem in that if a cooler or the like is used on a congested road in the summer, there is a high probability of overheating.

This invention was made based on the above-mentioned circumstances, and its purpose is to enable existing heater units to be used as auxiliary radiators, prevent overheating, and reduce the size of radiators or in vehicles with high heat loads. attempts to provide an automobile air conditioning system that can be used with the same radiator size as the base model.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a ventilation system that communicates an in-vehicle air intake with an in-vehicle air outlet and divides the midway portion into a heater unit accommodating portion and a cooler unit accommodating portion. a heater unit that also serves as an auxiliary radiator housed in the heater unit accommodating portion of the ventilation passage, an outside air introduction passage that joins the upstream side of the ventilation passage, and an exhaust passage that branches from the downstream side of the ventilation passage. and a blowing means provided downstream from the confluence point of the outside air introduction path for causing ventilation to pass through the heater unit accommodating section and the cooler unit accommodating section; a switching means for switching the ventilation path having dampers disposed near the branching part with the unit accommodating part and near the branching part of the exhaust passage, and when the engine starts to overheat, the switching means The ventilation path is switched to a path that takes in outside air from the outside air inlet, guides it to a heater unit that also serves as an auxiliary radiator, cools it, and releases the hot air to the outside of the vehicle through an exhaust path.

(Function) When the engine starts to overheat, this invention allows the switching means to change the ventilation path by taking in outside air from the outside air inlet, guiding it to a heater unit that also serves as an auxiliary radiator, and cooling the hot air through the exhaust path. It is possible to switch to a route where the water is released outside the vehicle through the air. This allows the existing heater unit to be used as an auxiliary radiator, which prevents overheating, and allows the use of the same radiator size as the base radiator for smaller radiators or vehicle models with high heat loads.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Figure 2 schematically shows the internal structure of the front side of a car. In the figure, 1 is an engine, and a radiator 3 is disposed in front of the engine 1, which is connected to the engine through a radiator hose 2. has been done. Further, a radiator fan 4 is arranged on the back side of the radiator 3, and is configured to forcibly guide wind to the radiator 3 for air cooling. In addition, a heater/cooler unit 8 housing a heater unit 6 and a cooler unit 7 of an air conditioning system 5, which will be described later, is arranged in the front grille, and the heat-exchanged air can be released from a discharge port 9 on the inside of the vehicle. There is.

Further, the heater unit 6 includes a radiator connected to the engine 1 via a heater hose 10, and the cooler unit 7 includes an evaporator for a cooling cycle (not shown). By operating an operation section (not shown), ON-OFF control can be performed independently. Note that since this point is well known, detailed explanation will be omitted.

FIG. 3 shows the basic configuration of the air conditioning system of the present invention.

In the figure, 10 is a ventilation passage that communicates the inside air intake 11 and the inside air outlet 9, and the middle part of this ventilation passage 10 is a heater unit accommodating part 10a that accommodates the heater unit 6.
It is divided into two parts: a cooler unit accommodating part 10b that accommodates the cooler unit 7;

Further, on the upstream side of the ventilation path 10, an outside air introduction path 12 with an outside air intake port 12a facing the outside of the vehicle is merged, and from the downstream side of the ventilation path 10, an outside air discharge port 1
The exhaust passage 13 with 3a facing outside the vehicle is in a branched state.

Further, on the downstream side of the confluence position of the outside air introduction path 12,
A fan 14 is provided as a ventilation means for blowing air through the heater unit housing section 10a and the cooler unit housing section 10b.

Further, a first damper 15 is provided near the confluence of the outside air introduction path 12, and a second damper 16 is provided near the branching portion between the heater unit accommodating portion 10a and the cooler unit accommodating portion 10b.
A third damper 17 is disposed near the branching portion of the air exhaust path 13, and constitutes a switching means 18 for switching the ventilation path.

Note that 20 shown in FIG. 2 is a temperature sensor attached to the vicinity of the back side of the radiator 3 or to a part of the engine.

Next, various operating states of the air conditioning system 5 configured as described above will be explained.

First, the operating state of the heating mode will be explained with reference to FIG. In this heating mode, the dampers 15 to 17 that switch the ventilation paths are in the solid line state in FIG. 3. Further, the heater unit 6 and the fan 14 are in an operating state.

As a result, air inside the vehicle is taken in from the interior air intake port 11 as shown by the solid arrow, warmed by passing through the heater unit 6, and then released from the interior discharge port 9. And it will heat up the inside of the car.

FIG. 4 shows the operating state in the cooling mode, and in this cooling mode, the dampers 15 to 17, which switch the ventilation paths, are in the state shown by the solid lines in FIG. Furthermore, the cooler unit 7 and fan 14 are in an operating state. As a result, air inside the vehicle is taken in from the interior air intake port 11 as shown by the solid arrow, cooled by passing through the cooler unit 7 , and then released from the interior discharge port 9 . Then, the inside of the car will be cooled.

FIG. 5 shows the operating state in the dehumidification mode, and in this dehumidification mode, the dampers 15 to 17, which switch the ventilation paths, are in the state shown by the solid line in FIG. Furthermore, the heater unit 6, cooler unit 7, and fan 14 are in operation. As a result, air inside the vehicle is taken in from the interior air intake port 11 as shown by the solid arrow, passes through both the heater unit 6 and the cooler unit 7, and then is discharged from the interior discharge port 9. The cooled air is then dehumidified by passing through the cooler unit 7, and the cooled air is warmed by the warmed air that passes through the heater unit 6, thereby dehumidifying the interior of the vehicle.

FIG. 6 shows the operating state in the outside air intake mode. In this outside air intake mode, the damper 1 that switches the ventilation path
5 to 17 are shown as solid lines in FIG. Further, the functions of the heater unit 6 and the cooler unit 7 are stopped, and only the fan 14 is operated. As a result, air from outside the vehicle is taken in from the outside air intake port 12a as shown by the solid line arrow, passes through the inactive cooler unit 7 without undergoing heat exchange, and then is discharged from the inside discharge port 9. Then, outside air will be brought into the car.

Further, FIG. 1 shows the operating state of the emergency cooling mode when the engine 1 tends to overheat. If engine 1 starts to overheat, such as during summer traffic jams,
This is detected by a temperature sensor 20 installed in the engine room, and the mode is switched to emergency cooling mode. During this emergency cooling, the dampers 15 to 17, which switch the ventilation paths based on the signal from the temperature sensor 20, are in the solid line state in FIG. 1.

Further, the heater unit 6 is activated to transfer heat from the engine 1, and the fan 14 is activated. As a result, air from outside the vehicle is taken in from the outside air intake port 12a as shown by the solid arrow, forced to cool the heater unit 6 to function as an auxiliary radiator, and then discharged from the exhaust passage 13 to the outside of the vehicle. The engine 1 is connected to a radiator 3 and a heater unit 6 that functions as an auxiliary radiator.
By cooling with both, overheating of the engine 1 is prevented.

Furthermore, in the past, the size of the radiator 3 was set assuming all driving conditions and outside temperature conditions, so the size of the radiator 3 had to be increased. Since the heater unit 6 can accordingly function as an auxiliary radiator, the radiator 3 can be made smaller accordingly, or the same radiator size as the base can be used in vehicle models with a high heat load.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the gist.

[Effects of the Invention] As detailed above, according to the present invention, an existing heater unit can be used as an auxiliary radiator, and it is possible to prevent overheating and to reduce the size of the radiator or to use it as a base for vehicle models with high heat loads. This has the effect of providing an automobile air conditioning system that can be used with the same radiator size as the one used.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention. Fig. 1 is an explanatory diagram showing the operating state of the emergency cooling mode when overheating is prevented, and Fig. 2 is a schematic illustration of the internal structure of the front side of the automobile. 3 schematically shows the basic configuration and is an explanatory diagram showing the heating mode operating state, FIG. 4 is an explanatory diagram showing the cooling mode operating state, and FIG. 5 is an explanatory diagram showing the dehumidifying mode operating state 6... Heater unit, 7... Cooler unit, 9... Vehicle inside outlet, 10... Ventilation duct, 10a
... Heater unit housing part, 10b... Cooler unit housing part, 11... Car interior air intake, 12...
・Outside air introduction path, 13...Exhaust path, 14...Blower means (fan), 15, 16.17...Damper, 18...
・Switching means. Figure 1 Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A ventilation passage that communicates between a car interior air intake and a car interior air outlet and whose midway portion is divided into a heater unit housing part and a cooler unit housing part, and an auxiliary radiator housed in the heater unit housing part of this ventilation passage. A dual-purpose heater unit, an outside air introduction passage that joins the upstream side of the ventilation passage, an exhaust passage that branches from the downstream side of the ventilation passage, and the heater unit that is provided downstream from the confluence point of the outside air introduction passage. A blowing means for causing ventilation to pass through the accommodating part and the cooler unit accommodating part, and near the confluence of the outside air introduction passage, near the branching part of the heater unit accommodating part and the cooler unit accommodating part, and near the branching part of the exhaust passage. A heater unit that also serves as an auxiliary radiator is provided with a switching means for switching the ventilation path, each having a damper arranged therein, and when the engine starts to overheat, the switching means changes the ventilation path to take in outside air from the outside air inlet. 1. An air conditioning system for an automobile, characterized in that the air conditioning system is configured such that the hot air is guided and cooled, and the hot air is switched to a path where the hot air is discharged outside the vehicle through an exhaust duct.