JPH0692133A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To quickly remove a blur of a glass in the periphery of a cabin as necessary for an occupant. CONSTITUTION:An air conditioner unit 3 is arranged in a part of a ceiling in a cabin 2. Air introduced into a duct 4 by a blower 5 is cooled or heated through an evaporator 7 and a heater core 8. Hot air is blown out from front surface blow ports 15, 15. A hot air duct 17, where formed right/left surface blow ports 17a, 17b and a rear surface blow port 17c, is arranged in the periphery of the air conditioner unit 3 and opened/closed by blow port opening/closing dampers 18, 18. When a side rear antiblur switch 28a is operated, an air conditioner control circuit 27 opens the dampers 18, 18 to also increase a blow amount of air of the blower 5 in accordance with a program, and hot air is blown out from also the right/left surface blow ports 17a, 17b and the rear surface blow port 17c, to quickly remove a blur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner suitable for construction of agricultural tractors and wheel loaders, and industrial vehicles.

[0002]

2. Description of the Related Art Conventionally, in a vehicle of this type, a driver's seat is provided with glass windows on the front, rear, left and right sides to improve the visibility of the entire circumference and to improve safety and workability. Is configured. Since the vehicle compartment is configured in this way, the air conditioner is generally provided on the ceiling of the vehicle compartment.

In this case, the conditioned air blown from the air conditioner is blown toward the front glass during heating and toward the upper half of the occupant during cooling, such as during winter. Even if the passenger compartment is easily fogged, it is possible to remove the fog on the windshield.

[0004]

However, in the above-mentioned one, although the windshield of the passenger compartment can be cleared of fog, since it is not blown toward the left and right and the rear glass, the glass other than the windshield is not blown. There was a problem that the fogging on the surface could not be removed quickly.

Therefore, in the past, for example, the actual Kaihei 4-60 was used.
A vehicle air conditioner as disclosed in Japanese Patent No. 710 has been considered. That is, this one is provided with a blowing duct that blows cold air or warm air toward the glass around the passenger compartment, and blows hot air not only to the front glass but also to the rear and left and right glass. , The haze is removed.

However, in some cases, even if it is desired to first remove only the fog on the front glass and then to remove the fog on the left and right and the rear glass as necessary, the conventional construction has such front, rear, left and right glass surfaces. Since the hot air is always blown toward the front, there is a problem that the fog on the windshield cannot be quickly removed.

The present invention has been made in view of the above circumstances, and an object thereof is to quickly remove the fogging on the front glass in the vehicle compartment and, if necessary, also remove the fogging on the left, right, and rear surfaces of the glass. An object of the present invention is to provide an air conditioning system for a vehicle capable of performing the above.

[0008]

DISCLOSURE OF THE INVENTION The present invention is for a vehicle in which air blown into a duct by a blower is heated by a heating means and blown out from a front air outlet toward a front glass of a vehicle compartment. An air conditioner is intended, and a peripheral surface outlet for blowing out the air heated by the heating means toward the peripheral surface glass excluding the front surface of the vehicle interior,
An outlet opening / closing means for opening / closing the peripheral surface outlet, an outlet opening / closing switch provided in the vehicle compartment, and the surroundings by driving the outlet opening / closing means in an operating state of the outlet opening / closing switch. It is characterized in that it is configured by providing a control means for opening the surface outlet and increasing the amount of air blown by the air blower.

[0009]

According to the vehicle air conditioner of the present invention, when the air outlet opening / closing switch is not operated, the air heated by the heating means is blown from the front air outlet toward the front glass of the vehicle compartment, The interior of the vehicle will be heated and the fog on the windshield will be removed. When the user operates the air outlet opening / closing switch as necessary, the control means drives the air outlet opening / closing means to open the ambient air outlet and increases the air blowing amount of the air blowing device. To control. As a result, the air heated by the heating means is blown out from the front air outlet and is also blown out from the peripheral air outlet toward the peripheral surface glass, and the air is blown out without lowering the blowing speed. Therefore, it becomes possible to quickly remove the fogging of the peripheral surface glass.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an air conditioner for a tractor will be described below with reference to the drawings. 1 (a) and 1 (b) schematically show the overall configuration. A vehicle interior 2 in which a driver's seat of a tractor 1 is installed is provided in a state of being surrounded by glass windows on four sides including doors. ing. The air conditioning unit 3 is arranged between the roof 2a and the ceiling 2b of the passenger compartment 2.

In this air conditioning unit 3, a blower 5 as an air blower is arranged on the rear side of the duct 4 and sucks air from the outside of the duct 4 and blows it to the downstream side (left side in the drawing) of the duct 4. It is supposed to do. An evaporator 7 of a refrigeration cycle 6 (see FIG. 2), which will be described later, is arranged on the downstream side of the blower 5 in the duct 4, so that the air circulated from the upstream side is cooled here and sent to the downstream side. It has become.

A heater core 8 as a heating means is arranged on the downstream side of the evaporator 7. This heater core 8
Is configured such that the cooling water of the drive engine 9 disposed inside the tractor 1 is circulated through the circulation path 10 and the hot water valve 11 (see FIG. 2).
The cooling water heated by (see FIG. 2) is used as a heat source to heat the air.

Further, on both sides of the heater core 8, cold air passages 12, 12 for bypassing the cold air sent from the evaporator 7 are formed. This cold air passage 12,1
The air mix dampers 13 and 13 for controlling the amount of cold air passing through the air mix dampers 2 and 3 are respectively arranged in the air conditioner 2, and the evaporator 7 is controlled by adjusting the opening degree of the air mix dampers 13 and 13. The cooled air passing through is distributed, and the temperature of the air sent to the downstream side is adjusted by appropriately adjusting the ratio of the air passing through the heater core 8 and the air passing through the cool air passages 12, 12. There is.

Cold air outlets 14, 14 are provided on the downstream side of the air mix dampers 13, 13 and the duct 4 is provided.
Front air outlets 15 and 15 for blowing hot air located at the tip of the
Is provided. The cold air outlets 14, 14 are arranged so as to blow out the conditioned air sent from the blower 5 toward the upper half of the occupant A in the passenger compartment 2, and the front air outlets 15, 15 are arranged.
Is arranged so as to blow out the conditioned air sent from the blower 5 toward the front glass 2c in the passenger compartment 2.

The cold air outlets 14 and 14 and the front air outlets 15 and 15 are the outlet switching dampers 16 and 16, respectively.
It is designed to be opened by switching. That is, the outlet switching dampers 16, 16 are, as described later,
In the cooling mode, the front outlets 15, 15 of the duct 4
It is driven so as to block the path leading to, and is driven so as to block the cold air outlets 14 in the heating mode.

A warm air duct 17 connected to both ends of the tip of the duct 4 is arranged on the outer peripheral portion of the air conditioning unit 3 so as to be adjacent to the inner peripheral wall of the passenger compartment 2. The warm air duct 17 is provided with left and right side air outlets 17a and 17b as long-range air outlets that are opened in a long shape in order to blow hot air toward the left and right side surfaces of the vehicle compartment 2. Along with this, there is provided a rear surface outlet 17c as a peripheral outlet that is formed in a long shape to blow out warm air toward the rear glass 2d.

Air outlet opening / closing dampers 18, 18 as air outlet opening / closing means are provided at the two connecting portions of the hot air duct 17 and the duct 4, respectively. It is designed to be opened and closed.

FIG. 2 shows a system diagram of the refrigeration cycle 6 and the hot water cycle 20. In this figure, the refrigeration cycle 6 is rotated by the drive engine 9 via the transmission mechanism 21 and the electromagnetic clutch 22. Driven compressor 23, condenser 24, receiver 25,
The expansion valve 26 and the evaporator 7 described above are connected by a refrigerant passage, and heat is exchanged with the air passing through the evaporator 7 by a well-known operation to cool the air. In addition, as described above, the hot water cycle 20 circulates the cooling water heated by the driving engine 9 to the heater core 8 via the circulation path 10 and the hot water valve 11, and exchanges heat with the air blown by the blower 5. It is designed to go and heat.

An air conditioning control circuit 27 for performing air conditioning control
Is configured to include a microcomputer and the like, and a program for air conditioning control is stored in advance. The air conditioning control circuit 27 has a function as a control means, and drives the servo motor 19 in response to a setting input from the air conditioning control panel 28 (see FIG. 1) provided in the driver's seat to drive the air outlet. Open / close damper 18
The opening / closing of the blower 5 is controlled, and the air flow rate of the blower 5 is set. In addition, the air conditioning control panel 28
Is provided with a side and rear anti-fog switch 28a as an outlet opening / closing switch.

In this case, the air conditioning control circuit 27 uses the blower 5
The servo motor 19 is controlled by a circuit as shown in FIG. That is, one terminal of the blower motor 5a of the blower 5 is the positive terminal of the battery (not shown) +
It is connected to B and the other terminal is grounded through a driving npn transistor 5b. The power supply input terminal of the air conditioning control circuit 27 is connected to the positive electrode terminal + B of the battery, the output terminal P1 is connected to the base of the transistor 5b, and the output terminal P2 is connected to the common connection point of the blower motor 5a and the transistor 5b. The output terminal P2 is an output terminal for directly applying the full voltage to the blower motor 5a without passing through the transistor 5b to set the blown air amount to the maximum.

The power supply terminal of the servomotor 19 is connected to the positive electrode terminal + B of the battery, and the two control input terminals are connected to the output terminals P3 and P4 of the air conditioning control circuit 27. The servomotor 19 is adapted to open and close the outlet opening / closing damper 18 in response to a drive signal from the air conditioning control circuit 27. An air-conditioning control panel 28 is connected to the input terminal A of the air-conditioning control circuit 27 so that operation signals can be input from the side and rear anti-fog switches 28a.

Next, the operation of this embodiment will be described with reference to FIG. Note that, here, when the air conditioning operation is in the heating mode, the occupant controls the air conditioning control panel 28.
The control when the side and rear anti-fog switches 28a are turned on by operating the will be mainly described, and the details of the air conditioning control of the vehicle interior 2 by the air conditioning control circuit 27 will be omitted.

First, when the heating mode is set from the air conditioning control panel 28 by the operation of the passenger A in the passenger compartment 2, the air conditioning control circuit 27 sets the heater core 8 of the hot water cycle 20.
In order to perform the heating operation with the hot water circulated in the air, the air mix damper 13 is drive-controlled to set the heating mode. Then, the air-conditioning control circuit 27 outputs a control signal for instructing the rotation speed from the output terminal P1 according to the setting of the blow rate of the blower 5, and controls the collector current of the transistor 5b to drive the blower 5 at the set rotation speed. To perform the blowing operation.

When the air conditioning operation is performed in this way, the warm air generated in the air conditioning unit 3 is blown downward from the front air outlet 15 toward the front glass 2c. As a result, the interior of the passenger compartment 2 is heated and the front glass 2
The haze of c is removed.

When the glass in the passenger compartment 2 is easily fogged, such as in winter, not only the front glass 2c, but also the left and right side glasses and the rear glass 2d are fogged and the visibility of the surroundings deteriorates, which hinders work. May come. In such a case, it is necessary to quickly remove the fog, and the side and rear anti-fog switches 28a of the air conditioning control panel 28 are turned on.

Then, the air-conditioning control circuit 27 controls the antifogging according to the flow chart shown in FIG. That is, since the air conditioning control circuit 27 is set to the heating mode and the side and rear anti-fog switches 28a are turned on, "Y" is selected in steps S1 and S2.
ES "and proceeds to step S3.

The air conditioning control circuit 27 then proceeds to step S
At 3, the drive signals are output from the output terminals P3 and P4 to the servo motor 19 to control the blower opening / closing damper 18 to be in the open state, and then the process proceeds to step S4, and the blower motor 5
In order to increase the rotation speed of a, the output terminal P2 outputs a control signal for increasing the air flow rate to the base of the transistor 5b.

As a result, the heated conditioned air is blown out from the front air outlets 15, 15 and is also sent to the warm air duct 17 side through the air outlet opening / closing dampers 18, 18, so that the left and right surfaces The air is also blown out from the air outlets 17a and 17b and the rear air outlet 17c. in this case,
Even if the number of air-conditioning air outlets increases and the overall outlet area increases, the amount of air blown by the blower 5 also increases at the same time. Therefore, the outlets 15, 15, 17a, 17
The blowing speed of the conditioned air blown out from b and 17c does not decrease, and it is possible to quickly remove the fog on the glass surface around the passenger compartment 2.

As a result, the heated conditioned air can be sufficiently blown up to the feet of the occupant A, so that the air-conditioned state in the passenger compartment 2 can be kept in a comfortable state of "head cold foot heat".

According to the present embodiment as described above, the air conditioning control circuit 27 causes the warm air duct 1 to operate in response to the operation of the side and rear anti-fog switches 28a of the air conditioning control panel 28.
Since the heated air-conditioning air is sent to 7 to blow out warm air to the front, rear, left and right glass surfaces of the passenger compartment 2, the occupant A defrosts the front glass 2c as necessary, or It becomes possible to select whether to perform anti-fog on the entire glass surface, and it becomes possible to flexibly respond to the state of the vehicle interior 2.

In the above embodiment, the case where the hot air is blown from the left and right side air outlets 17a and 17b and the rear air outlet 17c in the heating mode to prevent the fog is described, but the cold air is blown in the cooling mode. You may choose to put it out.

[0032]

As described above, according to the vehicle air conditioner of the present invention, the air outlet for the peripheral surface is provided to be openable / closable by the air outlet opening / closing means, and the control means operates the operating state of the air outlet opening / closing switch. Since the air outlet opening / closing means is driven to open the peripheral surface air outlet and the amount of air blown by the air blower is increased, if the air outlet opening / closing switch is operated as required by the occupant, the heating means is opened. The air heated by is blown out from the front air outlet, and even if it is directed from the ambient air outlet toward the peripheral surface glass, it will be blown out without lowering the blowing speed, and the surrounding surface glass will be fogged. It also has an excellent effect that it can be quickly removed.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an embodiment of the present invention,
(A) is a cross-sectional plan view, (b) is a vertical side view

FIG. 2 System diagram of refrigeration cycle and hot water cycle

FIG. 3 is an electrical configuration diagram of a main part.

FIG. 4 is a flowchart of a control program

[Explanation of symbols]

1 is a tractor (vehicle), 2 is a passenger compartment, 2c is a front glass,
2d is a rear glass (surrounding glass), 3 is an air conditioning unit, 4 is a duct, 5 is a blower (blower), 5a is a blower motor, 5b is an npn transistor, 8 is a heater core (heating means), 12 is a cold air passage, 13 is an air mix damper, 14 is a cold air outlet, 15 is a front air outlet, 16 is an outlet switching damper, 17 is a hot air duct, 17a, 17b.
Are left and right side air outlets (peripheral surface air outlets), 17c are rear surface air outlets (peripheral surface air outlets), 18 is an air outlet opening / closing damper (air outlet opening / closing means), 19 is a servomotor, and 27 is an air conditioning control circuit. (Control means), 28 is an air conditioning control panel, 2
8a is a side and rear anti-fog switch.

Claims (1)

[Claims] 1. An air conditioner for a vehicle, wherein air blown into a duct by a blower is heated by a heating means and blown out from a front air outlet toward a front glass of a vehicle compartment. A peripheral surface outlet for blowing out the air heated by the heating means toward the peripheral surface glass excluding the front surface, an outlet opening / closing means for opening / closing the peripheral surface outlet, and the vehicle interior A blower opening / closing switch provided in the air blower opening / closing switch, and a control means for driving the blower outlet opening / closing means in the operating state of the blower opening / closing switch to open the peripheral surface blower and increasing the air flow rate of the blower. An air conditioner for a vehicle, comprising: