JPH06234321A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To provide a vehicular air conditioner capable of performing zone air-conditioning without being a burden on the vehicle side from the viewpoint of installation cost. CONSTITUTION:Two package-type roof units 2, 3 each with a condensing unit 5 and a cleaning unit 6 integrally enclosed therein are installed on the vehicle roof of a bus. The respective roof units 2, 3 are provided with evaporator blowers 11a-11f for blowing air into the vehicle interior, and the respective evaporator blowers 11a-11f are independently controlled by an air-conditioning control device on the basis of temperature difference between the set temperature and the detected temperature of an internal air thermistor for detecting the vehicle interior temperature every air-conditioning zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof-mounted air conditioner for a vehicle, and is particularly suitable for use in a bus vehicle.

[0002]

2. Description of the Related Art In a large vehicle having a large passenger compartment such as a bus vehicle, when controlling the inside of the passenger compartment as a whole when controlling the inside of the passenger compartment, variations in solar radiation load, personnel load, etc. in each part of the passenger compartment may occur. However, it is difficult to maintain a constant temperature inside the vehicle. Therefore, the vehicle interior is divided into several zones (air-conditioning range), cooling units are distributed in each zone, and the air volume of each zone is individually controlled.
Alternatively, there is known a concept of zone air conditioning such as a method in which a damper is appropriately provided in the air conditioning duct and the air volume of each blowout grill is individually controlled by opening / closing the damper.

[0003]

However, in the case of performing zone air conditioning by each of the above methods, it is necessary to jointly design the air conditioner and the vehicle side. There is a cost burden on the body side.
A package-type rooftop-mounted air conditioner (see Japanese Patent Laid-Open No. 61-271117) is known, which is excellent in mounting on the vehicle side. However, in this package-type air conditioner, the temperature inside the passenger compartment is reduced. Only the left and right controls are performed, and the above zone air conditioning is not implemented. In particular, in a bus vehicle that is long in the front-rear direction, the heat load may differ between the front side and the rear side in the passenger compartment. Therefore, temperature control is performed not only on the left and right sides of the passenger compartment but also in the front-rear direction according to the heat load. There is a need. The present invention has been made based on the above circumstances, and an object thereof is to provide a vehicle air conditioner capable of performing zone air conditioning without incurring a cost burden on the vehicle side in terms of mounting.

[0004]

In order to achieve the above object, the present invention integrally houses a condensing unit having a refrigerant condenser, a cooling unit having a refrigerant evaporator, and a blowing means for blowing air into a vehicle interior. In the rooftop-mounted vehicle air conditioner including a package-type rooftop unit installed on the roof of a vehicle and a control unit that controls the amount of air blown by the blower unit, the rooftop unit includes:
A plurality of air conditioners are installed in the front-rear direction of the vehicle and specify the air conditioning range in the vehicle compartment that each rooftop unit covers in the front-rear direction of the vehicle, and the air blower supplies air to the left side of the vehicle interior within the air conditioning range. A left-side blower and a right-side blower for supplying air to the right side in the vehicle compartment, the control means,
It has a plurality of room temperature detecting means for detecting the vehicle interior temperature for each of the air-conditioning ranges on the left and right sides of the vehicle interior, and controls the air flow rates of the left side blower and the right side blower based on the detection signals of these room temperature detecting means. That is the technical means.

[0005]

In the vehicle air conditioner of the present invention having the above-described structure, a plurality of rooftop units installed in the front-rear direction of the vehicle specify and control the air-conditioning range in the front-rear direction of the vehicle. In each air-conditioning range, the left and right air temperature inside the vehicle compartment is controlled independently by controlling the air flow rates of the left and right air blowers based on the detection signals from the room temperature detection means provided on both the left and right sides of the vehicle interior. Can be controlled.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner of the present invention will be described. FIG. 1 is a schematic diagram of a package-type rooftop unit installed on the roof of a bus vehicle. The vehicle air conditioner of the present embodiment is mounted on the bus vehicle 1,
Refrigerant compressor (not shown) driven by a traveling engine (not shown), and package type first rooftop unit 2 and second rooftop that integrally house functional components other than this refrigerant compressor that constitute a refrigeration cycle The unit 3 and the air conditioner control device 4 (see FIG. 6) are provided. The rooftop units 2 and 3 house the condensing unit 5 and the cooling unit 6 in one unit case 7 and are installed in the front-rear direction on the roof of the bus vehicle 1 (FIG. 5).
reference). It should be noted that the first rooftop unit 2 installed on the front side of the bus vehicle 1 sets the air conditioning range in the front side of the vehicle interior, and the second rooftop unit 3 installed on the rear side of the bus vehicle 1 sets the rear side of the vehicle interior. Set as the air conditioning range. Condensing unit 5
Is composed of a refrigerant condenser 8 arranged on both left and right sides of the unit, a condenser fan 9 arranged in the central portion of the unit, and a receiver (not shown). The cooling unit 6 includes a refrigerant evaporator 10 arranged in the central part of the unit, and three evaporator blowers 11 (1) arranged to face the refrigerant evaporator 10.
1a to 11f), and a decompression device (not shown).

The unit case 7 includes a condenser fan 9
The intake 12 (see FIG. 5) for taking in the air blown to the refrigerant condenser 8 from the outside of the passenger compartment in accordance with the operation of the above, and the outlet 13 for discharging the air heated by the refrigerant condenser 8 to the outside of the passenger compartment (see FIG. 5). 5), an inlet 14 for introducing the air blown to the refrigerant evaporator 10 from the passenger compartment in accordance with the operation of the evaporator blower 11, and the air cooled by the refrigerant evaporator 10 to the passenger compartment. An outlet 15 is provided. The intake port 12 is opened in the upper part of the refrigerant condenser 8 arranged on both sides of the condenser fan 9, and the discharge port 13 is opened in the upper part of the condenser fan 9 arranged in the central part of the condensing unit 5. ing. The inlet 14 is the unit case 7
Is provided at the center of the bottom surface of the vehicle so as to extend in the vehicle width direction of the bus vehicle 1 and is opened in the vehicle compartment (see FIG. 3 and BB in FIG.
(Cross-section view along the line). The air outlets 15 are provided at one location on both sides of the bottom surface of the unit case 7 in the vehicle width direction of the bus vehicle 1, and are communicated with air conditioning ducts 16 extending in the front-rear direction of the bus vehicle 1 on both left and right sides inside the vehicle compartment. (See Figure 2
(A cross-sectional view taken along the line AA of FIG. 1). The air conditioning ducts 16 on both the left and right sides are provided with a partition plate 17 at the center of the vehicle compartment.
Independent air passages 16a, 16b, 16c, 16 partitioned by (see FIG. 4 and a sectional view taken along the line CC in FIG. 1)
Configure d. Further, each air conditioning duct 16 is appropriately provided with a blowout port 18 for blowing air into the vehicle interior.

The air conditioner control device 4 is provided with the inside air thermistors 19, 20, 21, 22 for detecting the temperature in the passenger compartment,
Based on the detected temperatures of the inside air thermistors 19 to 22 and the set temperature set by the air conditioner operation panel (not shown), the power transistors 23, 24, 25, 26, 27,
The input voltage to the evaporator blowers 11a to 11f is controlled via 28 to determine the air blowing amount (air blowing level) of each of the evaporator blowers 11a to 11f (see FIG. 6). The inside air thermistors 19 to 22 are provided corresponding to the four air conditioning zones in the vehicle compartment, one on each of the left and right sides on the front side and the rear side in the vehicle compartment, for a total of four. Each air-conditioning zone is an air-conditioning region that is specified by dividing the interior of the vehicle into a front side and a rear side with the partition plate 17 as a boundary, and further dividing it into left and right sides. In the present embodiment, in the air conditioning range on the front side of the passenger compartment, which is served by the first rooftop unit 2 installed on the front side of the bus vehicle 1, the right side with respect to the traveling direction is the first air conditioning zone and the left side is the second air conditioning zone. In the air conditioning range on the rear side of the passenger compartment, which is served by the second rooftop unit 3 installed on the rear side of the bus vehicle 1, the right side with respect to the traveling direction is called the third air conditioning zone, and the left side is called the fourth air conditioning zone. (See Figure 1).

The operation of the air conditioner controller 4 for controlling the evaporator blowers 11a to 11f based on the detection signals of the inside air thermistors 19 to 22 will be described below with reference to the flow chart shown in FIG. First, the detected temperature of the inside air thermistors 19 to 22 provided in each air conditioning zone is input (step 100), and the average room temperature of the entire passenger compartment is calculated from each detected temperature (step 101). Next, step 10
Based on the average room temperature calculated in 1 and the set temperature set on the air conditioner operation panel, the overall (all the evaporator blowers 11 of the rooftop unit) blow level is determined (step 1
02). Next, the temperature difference between the average room temperature calculated in step 101 and the temperature detected by each of the inside air thermistors 19 to 22 is read (step 103), and based on the temperature difference, both roof units 2 and 3 (air conditioning ducts) are read. The blower level of each of the evaporator blowers 11a, 11c, 11d, and 11f arranged on the 16th side) is determined (step 104), and the blown amount of each air conditioning zone is changed. The evaporator blowers 11a, 11c, 11d arranged on both sides of the rooftop unit,
The ventilation level of 11f is determined independently for each air-conditioning zone, and each of the evaporator blowers 11b and 11e arranged in the central portion of the rooftop unit has a step 102.
Operates according to the ventilation level determined in. For example, in the case of the first air conditioning zone, by operating the evaporator blower 11b arranged in the center at the air blowing level determined in step 102 and changing the evaporator blower 11a according to the air blowing level determined in step 104. The temperature of the first air conditioning zone can be brought close to the average room temperature.

[0010]

Since the vehicle air conditioner of this embodiment has a structure in which the package rooftop unit is installed on the roof of the vehicle, it has high versatility and bears the cost of mounting the vehicle on the vehicle side. There is no need to pay. By installing a plurality of rooftop units, zone air conditioning can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a package-type rooftop unit according to the present embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a perspective view of a package-type rooftop unit installed in a bus vehicle.

FIG. 6 is an electric circuit diagram according to the present embodiment.

FIG. 7 is a flowchart showing the operation of the air conditioner control device.

[Explanation of symbols]

 2 1st rooftop unit 3 2nd rooftop unit 4 Air conditioner control device (control means) 5 Condensing unit 6 Cooling unit 8 Refrigerant condenser 10 Refrigerant evaporator 11a, 11d Evaporator blower (right side blower) 11b, 11e Evaporator blower ( Blower means) 11c, 11f Evaporator blower (left blower) 19-22 Inside air thermistor (room temperature detection means)

Claims (1)

[Claims] 1. A package-type rooftop unit installed on a roof of a vehicle, which integrally houses a condensing unit having a refrigerant condenser, a cooling unit having a refrigerant evaporator, and a blowing unit for blowing air into a vehicle interior. In a rooftop-mounted air conditioner for a vehicle, comprising: a control unit that controls the amount of air blown by the blower unit, a plurality of rooftop units are installed in the front-rear direction of the vehicle, and the interior of each rooftop unit is served by the rooftop unit. While specifying the air conditioning range of the vehicle in the front-rear direction, the blower has a left blower that supplies air to the left side of the vehicle interior within the air conditioning range and a right blower that supplies air to the right side of the vehicle interior, The control means has a plurality of room temperature detecting means for detecting the vehicle interior temperature for each of the air-conditioning ranges on the left and right sides of the vehicle interior, and based on the detection signals of these room temperature detecting means. An air conditioner for a vehicle, characterized in that the air flow rates of the left side blower and the right side blower are controlled.