JPH0687317A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To apply a heating made to the inside of a vehicle cabin to keep the head cool and the feet warm in an air conditioner for a tractor. CONSTITUTION:An air conditioning unit 13 is arranged in the ceiling 12b in the cabin 12 of a vehicle. The air sucked through a blower 15 is blown downward into the cabin 12 from a supply part 24 through an evaporator 17 and a heater core 18. When the blowing rate of the blower 15 is reduced, an air conditioning control circuit 38 reduces the opening angle of a damper to reduce the opening degree of the supply part 24. Accordingly, even if the blowing rate is reduced, this constitution can prevent the blowing speed of conditioned air from lowering and can blow hot air to the feet of the operator A. The cabin 12 can be kept a head cool and the feet warm condition, providing a comfortable state.

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, wheel loaders and the like, and industrial vehicles.

[0002]

2. Description of the Related Art In the construction of agricultural tractors, wheel loaders, etc., and industrial vehicles, the passenger compartment in which the driver's seat is installed is very small. Due to the wide field of view, the space for arranging the air conditioner is greatly restricted. In such a vehicle, for example, FIG.
As shown in (a), the air conditioning unit of the air conditioner 1 is usually arranged on the ceiling 2a of the upper part of the vehicle compartment 2 or the like, and the cool air and warm air outlets 3 are provided on the ceiling 2a of the vehicle compartment 2. I am trying. Thereby, the conditioned air of cold air or warm air blown from the air outlet 3 of the ceiling portion 2a is blown toward the feet of the occupant A.

[0003]

By the way, the air conditioner 1
Since the speed of the conditioned air blown out from the blower outlet 3 is usually in proportion to the air blowing amount of the air blowing device 4, when the air blowing amount of the air blowing device 4 is large in the air conditioning unit of the air conditioning device 1 as described above. Since the speed of the conditioned air blown out from the air outlet 3 is also increased, it is possible to sufficiently reach the feet of the occupant A in the passenger compartment 2.

However, when the amount of air blown by the air blower 4 is reduced, the velocity of the conditioned air blown out from the outlet 3 is also reduced as shown in FIG. 7 (b), and as a result, the conditioned air reaches the feet of the passenger A. Cannot be reached. Therefore, the conditioned air reaches only the vicinity of the upper half of the occupant A, and the air conditioning state in the passenger compartment 2 is destroyed due to the change in the blown air amount.

In this case, when heating the passenger compartment 2, it is preferable that the occupant A is controlled to have "head cold foot heat" as the air conditioning state. That is, since warm air tends to move upward, it is intended to form a "head cold foot heat" state by blowing warm air, which is conditioned air, to the feet of the occupant A as much as possible.

However, when the amount of air blown by the air blower 4 is small as described above, the speed of the warm air blown out from the blowout port 3 decreases and the warm air does not reach the feet of the occupant A. There is a problem that warm air is sent directly to the upper half of A and it becomes impossible to create a comfortable air-conditioning environment that causes "head cold foot heat".

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to reliably reach warm feet in the passenger compartment even when the amount of air blown by the air blower is small. An object is to provide a vehicle air conditioner capable of forming a comfortable air conditioning environment.

[0008]

SUMMARY OF THE INVENTION An air conditioner for a vehicle according to the present invention includes a blower for sucking air inside or outside a vehicle into a duct, and a blower provided in the duct for blowing air from the blower. Heating means for heating, a blower outlet provided in the ceiling of the vehicle compartment for blowing out the air heated via the heating means downward, and an opening amount of which is adjustable at the blower outlet. The opening amount adjusting means and the control means for controlling the opening amount adjusting means so as to reduce the opening amount of the air outlet in response to the decrease in the amount of air blown by the air blower. It is characterized by

[0009]

According to the vehicle air conditioner of the present invention, when the air inside the vehicle interior or outside the vehicle interior is sucked into the duct by the air blower, it is blown from the outlet as the hot air heated by the heating means. Become. At this time, when the amount of air blown by the air blower is large, the control means controls the opening amount setting means so that the amount of airflow at the air outlet is increased. The opening amount setting means is drive-controlled so as to be small. As a result, even if the amount of air blown is small, it is possible to prevent the blowing speed of the warm air from the outlet from decreasing, allowing the warm air to reach the feet of the occupants sufficiently, and to improve the air conditioning environment in the passenger compartment by using the "head cold foot heat". Can be held in a comfortable state.

[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 FIGS. 1 (a) and 1 (b) schematically show the entire configuration. A vehicle interior 12 in which a driver's seat of a tractor 11 is installed is provided in a state of being surrounded by glass windows on four sides including doors. ing. The air conditioning unit 13 is arranged between the roof 12a and the ceiling 12b of the passenger compartment 12.

In this air conditioning unit 13, the duct 1
A blower 15 as an air blower is disposed on the rear side of the duct 4, and air is sucked from the outside of the duct 14 and blown to the downstream side (left side in the drawing). The evaporator 17 of the refrigeration cycle 16 (see FIG. 2), which will be described later, includes the duct 14
It is arranged on the downstream side of the blower 15 inside, and the air circulated from the upstream side is cooled here and sent to the downstream side.

A heater core 18 as a heating means is arranged downstream of the evaporator 17. In the heater core 18, the cooling water of the drive engine 19 arranged inside the tractor 11 is circulated by the circulation path 20 and the hot water valve 21 (see FIG. 2).
(Refer to FIG. 4), and the air is heated by using the cooling water heated by the vehicle engine 19 as a heat source.

Further, on both sides of the heater core 18, cold air passages 22 and 22 through which the cold air sent from the evaporator 17 is bypassed are formed. This cold air passage 2
2, 22 are respectively provided with air mix dampers 23, 23 for controlling the amount of cold air passing therethrough, and the evaporators are adjusted by adjusting the opening degrees of the air mix dampers 23, 23. The cooled air passing through 17 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 18 and the air passing through the cool air passages 22 and 22. Has become.

Two air outlets 24, 24 are formed at the tip of the duct 14 to blow out the conditioned air downward, and the two air outlets 24, 24 are passed through the heater core 18 and the cold air passages 22, 22 to be mixed. Air-conditioned air is blown out.

On the rear side of the duct 14, the passenger compartment 12
An inside air introduction port and an outside air introduction port for sucking air from inside and outside are formed, and an inside air introduction port filter 25 and an outside air introduction port filter 26 are provided respectively. Then, any one of the inside air introduction port and the outside air introduction port is opened by the switching operation of the inside / outside air switching damper 27, and the blower 15 responds to the switching operation of the inside / outside air switching damper 27. The air in the passenger compartment 12 is sucked through the inside air inlet through the filter 25, and the air outside the passenger compartment 12 is sucked through the outside air inlet through the filter 26.

FIG. 2 shows a system diagram of the refrigeration cycle 16 and the hot water cycle 28. In this figure, the refrigeration cycle 16 is rotationally driven by the engine 19 via the transmission mechanism 29 and the electromagnetic clutch 30. The compressor 31, the condenser 32, the receiver 33, the expansion valve 34, and the evaporator 17 described above are connected by a refrigerant passage, and by a well-known operation, heat is exchanged with the air passing through the evaporator 17 for cooling. To get the effect. In addition, the warm water cycle 28,
As described above, the cooling water heated by the driving engine 19 is circulated to the heater core 18 via the circulation path 20 and the hot water valve 21, and heat is exchanged with the air blown by the blower 15 to obtain a heating effect. It has become.

The air outlet 24 described above is specifically opened by two dampers 36 as an opening amount adjusting means rotatably provided on the air outlet grill 35 as shown in FIG. The amount is adjusted. In this case, the damper 36 is driven by the servo motor 37,
The opening angle θ is adjusted.

Air conditioning control circuit 38 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 38 has a function as a control means, and drives and controls the servo motor 37 as described later according to the setting input from the air-conditioning control panel 39 provided in the driver's seat. 15
It is designed to set the air flow rate.

Next, the operation of this embodiment will be described with reference to FIGS. Note that, here, the control when the air conditioning operation is in the heating mode and the occupant operates the air conditioning control panel 39 to change the blown air amount will be described, and the explanation is omitted, but the air conditioning control circuit 38 is described.
In accordance with the temperature setting of the air-conditioning control panel 39, the air-conditioning control program (not shown) controls the air conditioning in the passenger compartment 12.

That is, first, when the temperature setting or the heating mode is set by the air conditioning control panel 39, the air conditioning control circuit 38 performs the heating operation with the hot water circulated to the heater core 18 by the hot water cycle 28 so as to perform the heating operation. 23 is driven and controlled to set the heating mode. Then, the air conditioning control circuit 38 outputs a control signal for instructing the rotation speed according to the setting of the blown air amount P of the blower 15,
The blower 15 is driven at a set rotation speed to perform a blowing operation. At this time, the air conditioning control circuit 38 causes the outlet grill 35
For the opening angle θ of the damper 36 of
Output a control signal to and set. In this case, the opening angle θ of the damper 36 is set based on the result calculated in the same manner as the setting in the program described later.

When the air conditioning operation is performed in this way, the warm air generated by the air conditioning unit 13 is blown out from the outlet 24 toward the feet of the occupant A. At this time, the velocity of the warm air blown out from the air outlet 24 is adjusted as described below so as to be equal to or higher than a predetermined velocity, so that the warm air reaches the foot portion of the occupant A, which is comfortable. An air-conditioned space is formed.

Then, in such a state, when the occupant A is set to change the blowing rate P of the warm air which is the conditioned air, the air conditioning control circuit 38 follows the program of the flowchart shown in FIG. The following control is performed. That is, the air-conditioning control circuit 38 starts the program when the air-conditioning control panel 39 is operated, and first determines in step S1 whether or not the air flow rate P is changed. Return to the air-conditioning control program, and if "YES" is determined, the process proceeds to step S2.

The air conditioning control circuit 38 then proceeds to step S
In step 2, the opening angle θ of the damper 36 is calculated for the set air flow rate P. At this time, the opening angle θ of the damper 36
Controls the blow rate V from the blow outlet 24 to be constant with respect to the set blow rate P. For example, the relationship is as shown in FIG.

That is, FIG. 5 shows a correlation in which the opening angle θ of the damper 36 is increased according to the set air flow rate P as the air flow rate P is reduced. This indicates that the air outlet 24 is controlled so that the opening amount increases as the blown air amount P decreases.

Next, the air conditioning control circuit 38 proceeds to step S3.
Blower 15 so that the air flow rate P is set to
A control signal is output to control the rotation speed, and when the process proceeds to step S4, the control signal is output to the damper servo motor 37, and the damper 36 is driven so that the opening angle θ obtained in step S2 is obtained. As a result, the opening amount of the blowout port 24 becomes appropriate, and the blowout speed V of the air blown by the blower 15 from the blowout port 24 is controlled to be always constant.

This suppresses the decrease in the velocity of the air blown from the outlet 24 as the amount of blown air P decreases, by reducing the opening amount, and as a result, By controlling the opening amount of the air outlet 24, the amount of air passing through the unit area is controlled to be substantially constant, and the air passage speed is controlled to be constant.

As a result, for example, even when the blower amount P by the blower 15 of the air conditioning unit 13 is large as shown in FIG. 6A, the blower 15 also blows air as shown in FIG. 6B. Even when the air volume P is small, the blowing speed V of the warm air blown out from the air outlet 24 is controlled so as to be always constant. Therefore, even when the air blowing volume P of the blower 15 is small, the conditioned air is kept at the feet of the passenger A. Will be able to send enough.

As a result, the warm air blown from the air outlet 24 can be always sent to the feet without staying in the vicinity of the upper body of the occupant A, so that the air condition of "head cold foot heat" can be maintained and the passenger compartment can be kept. The inside of 12 can be made a comfortable air-conditioning environment.

According to this embodiment, the air-conditioning control circuit 38 reduces the opening angle θ of the damper 36 in response to the decrease in the blown air amount P of the blower 15, thereby opening the air outlet 24. As a result, the velocity V of the conditioned air blown out from the air outlet 24 can always be maintained at a certain level or higher, and as a result, warm air is always supplied to the occupant A regardless of the blowing amount P of the blower 15. It can be delivered to the feet, so that the interior of the vehicle compartment 12 can be maintained in a comfortable air-conditioning environment of "head cold foot heat".

In the above embodiment, the damper 36
The opening angle θ of the blower 15 is set to have a linear relationship as shown in FIG. 5 according to the blown air amount P of the blower 15. However, the present invention is not limited to this. You may set so that (theta) may be changed in steps.

Further, in the above embodiment, the outlet 24
Although the opening amount is set by controlling the opening angle θ of the two dampers 36, the present invention is not limited to this, and for example, one damper may be used.

[0032]

As described above, according to the vehicle air conditioner of the present invention, the air outlet is provided with the opening amount adjusting means for adjusting the opening amount, and the control means reduces the air blowing amount by the air blowing device. In response to this, control is performed so that the opening amount of the air outlet is made small, so even if the air flow rate is small, it is possible to prevent the blowing speed of the hot air from the air outlet from decreasing, and It becomes possible to reach the passenger's feet sufficiently, and the excellent effect that the air-conditioning environment in the passenger compartment can be maintained in a comfortable state of "head cold foot heat" is exhibited.

[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 a perspective view of an outlet grill.

FIG. 4 is a flowchart of a damper opening angle control program.

FIG. 5 is a correlation diagram between the damper opening angle and the air flow rate.

FIG. 6 is an operation explanatory view for explaining a blowout state of conditioned air,
(A) when the air flow is large, (b) when the air flow is small

FIG. 7 is a view corresponding to FIG. 6 for explaining a conventional example.

[Explanation of symbols]

11 is a tractor (vehicle), 12 is a passenger compartment, 13 is an air conditioning unit, 14 is a duct, 15 is a blower (blower), 16
Is a refrigeration cycle, 17 is an evaporator, 18 is a heater core (heating means), 19 is a vehicle engine, 23 is an air mix damper, 24 is an outlet, 28 is a hot water cycle, 3
5 is an outlet grille, 36 is a damper (opening amount adjusting means),
37 is a servo motor, 38 is an air conditioning control circuit, and 39 is an air conditioning control panel.

Claims (1)

[Claims] 1. A blower device for sucking air inside or outside the vehicle compartment into a duct, a heating unit arranged in the duct for heating air sucked by the blower device, and a ceiling portion inside the vehicle compartment. A blower outlet for blowing the air heated by the heating means downwardly, an opening amount adjusting means provided at the blower outlet so as to adjust the opening amount, and an air blowing amount by the blower. The air conditioner for a vehicle, comprising: a control unit that controls the opening amount adjusting unit so as to reduce the opening amount of the air outlet in response to a decrease in