JPH0343845Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) This invention relates to an exhaust air control device in an air conditioning system of a vehicle, and more specifically to an exhaust air control device for keeping the head and feet of an occupant warm during heating mode. (Prior Art) In a conventional vehicle air conditioning system, as described in, for example, Japanese Utility Model Application Publication No. 58-168906, the ceiling duct installed in the passenger compartment is separated from the cooling unit, and the ceiling duct is separated from the cooling unit. There is known a structure in which an introduction fan can be disposed in the ceiling duct only when the mode is the bi-level mode, so that the ceiling duct functions simply as an outside air introduction duct. (Problem to be solved by the invention) However, in the above-mentioned air conditioning system, for example, during heating, only warm air is blown out from the floor duct installed on the floor. The atmosphere around the occupants inside becomes only warm air, which violates the so-called comfort principle of keeping the head cold and feet warm.Especially when the vehicle is a large bus and the occupants remain seated for a long period of time, There was a problem in that the passenger's discomfort was likely to increase. The object of this invention is to ensure comfortable living by keeping the head cold and feet warm during heating. (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a floor duct arranged on the floor of the vehicle interior, a ceiling duct arranged on the ceiling of the vehicle interior, and a ceiling duct arranged on the ceiling of the vehicle interior. An air conditioning duct that supplies hot air to the floor duct and the ceiling duct, an outside air introduction fan that sends outside air to the ceiling duct, a drive device that drives the outside air introduction fan, and a room temperature detection that detects the temperature inside the vehicle interior. means for determining whether a detected temperature detected by the room temperature detecting means is equal to or higher than a predetermined value; The drive device is operated to increase the amount of outside air introduced, and when the detected temperature does not reach a predetermined value, the drive device is operated so that the outside air introduction fan rotates at a low speed to reduce the amount of outside air introduced. (Function) When the temperature inside the vehicle does not reach a predetermined value, the outside air introduction fan rotates at a low speed to slightly lower the temperature of the warm air supplied from the ceiling duct into the vehicle interior.
Additionally, when the temperature inside the vehicle exceeds a predetermined value, the outside air introduction fan rotates at high speed, and the proportion of outside air supplied to the ceiling duct increases significantly, increasing the temperature of the warm air supplied from the ceiling duct into the vehicle interior. The temperature drops significantly, and the warm air is blown out from the ceiling duct into the passenger compartment. (Embodiment) Fig. 1 shows an embodiment of this invention. For example, an inside air inlet 2 and an outside air inlet 3 are installed on the upstream side of an air conditioning duct 1 installed in the body of a large bus.
are each formed with an opening, and an inside/outside air switching door 4 is provided at the branching part of both the inlets 2, 3, and an evaporator 5 is arranged downstream of this inside/outside air switching door 4. . The piping path of this evaporator 5 includes an expansion valve 7, a liquid tank 8, a condenser 9, and two compressors 1.
0, 11 etc. are arranged, each compressor 1
0 and 11 are designed to be driven by a sub-engine 12. Further, a preheater 14 with a built-in hot water pump, a hot water valve 15, and two heater cores 16 and 17 are installed in the engine cooling water piping 13 of the sub-engine 12, and both heater cores 16 and 17 are used for air conditioning. Air mix doors 18 and 1 are disposed downstream of the evaporator 5 in the duct 1, and air mix doors 18 and 1 are provided near both heater cores 16 and 17.
9 are provided respectively. Further, a blower fan 19 is disposed downstream of the heater cores 16 and 17 in the air conditioning duct 1, and the drive shaft of a fan motor 20 that drives the blower fan 19 is also connected to the sub-engine 12 via a pulley 21. On the other hand, this sub-engine 12 is connected to a fan motor 20 via a driving electromagnetic clutch 21A. Further, the air conditioning duct 1 on the downstream side of the blower fan 19 communicates with a floor duct 23 disposed along the floor below the seat 22 of the vehicle interior. A plurality of air outlets 23a are formed in this floor duct 23. Further, the air conditioning duct 1 communicates with a ceiling duct 24 arranged along the ceiling of the vehicle interior.
This ceiling duct 24 has a plurality of air outlets 24a.
On the other hand, an outside air introduction fan 25 is attached to the upstream end of the ceiling duct 24. Further, an airflow adjustment door 25A is attached to the downstream side of the outside air introduction fan 25, and the floor duct 23 can be closed or opened by operating an actuator to be described later. FIG. 2 shows a circuit for driving the outside air introduction fan 25.
The driving fan motor is two fan motors 25.
The contacts of the first and second relays 26, 27 are connected to both motors 25a, 25b, respectively.
27 is adapted to selectively switch between normally closed contacts 26a, 27a and normally open contacts 26b, 27b in response to the output of a control device (judgment means) 28 constituted by, for example, a microcomputer. In addition,
A fan starting relay switch 29 is provided between the control device 28 and the fan motor 25a.
The drive device includes fan motors 25a, 25b, first and second relays 26, 27, and a fan starting relay switch 29. Further, a motor 30 as an actuator of the airflow adjustment door 25A is connected to the control device 28, and this motor 30 is connected to the contacts 31a, 31b, 32 of the two relays 31, 32.
By opening and closing a and 32b, forward rotation, reverse rotation, or stopping can be performed. Here, the control device 28 is the vehicle interior temperature setting device 3.
3. Calculation control is performed to obtain a comprehensive signal for air conditioning by receiving outputs from a vehicle interior temperature sensor (room temperature detection means) 34, an outside temperature sensor 35, and the like. Next, the operation of the exhaust air control device will be explained. For example, when the air conditioning system is operated in heating mode in winter (the sub-engine 12 is stopped and the compressors 10 and 11 are also stopped), each air outlet 2 of the floor duct 23
While warm air is being discharged from 3a, the fan start relay switch 29 is turned on, and the temperature is set according to the output of the vehicle interior temperature sensor 34, that is, the temperature detected by the vehicle interior temperature sensor 34, and the setting of the vehicle interior temperature setting device. A general signal for air conditioning is calculated by the control device 28 according to the temperature, etc., and the control device 28
Based on the output of , contacts 26 of relays 26 and 27
The connection state of a, 26b, 27a, and 27b is switched, and cold air is discharged from each outlet 24a of the ceiling duct 24 according to this connection state. In other words, when the detected temperature has not reached a predetermined value and the normally closed contacts 26a and 27a are closed, the fan motors 25a and 25b are connected in series and the voltage applied to each motor 25a and 25b becomes small.
The air volume is also small. Conversely, when the detected temperature is higher than a predetermined value, the airflow becomes larger due to parallel connection. Note that in the above description, the adjustment of the exhaust air from the outlet 24a of the ceiling duct 24 is performed in stages solely by setting the rotational speed of the outside air introduction fan 25, but the opening degree of the adjustment door 25A is not shown. By appropriately adjusting the actuator, it is possible to adapt to the delicate feeling of the occupant. Here, the adjustment door 25A closes the floor duct 23 in the cooling mode. The following table describes in further detail other aspects of the operation of the embodiments described above.

[Table] In the above table, the symbol P indicates automatic start or automatic stop, the symbol Q indicates the rotation speed, and R indicates the rotation state.
S indicates the classification column of the on/off state of the electromagnetic clutch, and r ₁ , r ₂ , r ₃ , r ₄ are each, for example,
Indicates 1700rpm, 1500rpm, 1300rpm, 1100rpm, Hi is high speed, Lo is low speed, MH is medium high speed,
ML indicates medium and low speeds. (Effects of the invention) As described above, according to this invention, when the temperature inside the vehicle does not reach a predetermined value, the outside air introduction fan rotates at a low speed to reduce the temperature of the warm air supplied from the ceiling duct into the vehicle interior. Slightly lower. Additionally, when the temperature inside the vehicle exceeds a predetermined value, the outside air introduction fan rotates at high speed, and the proportion of outside air supplied to the ceiling duct increases significantly, increasing the temperature of the warm air supplied from the ceiling duct into the vehicle interior. The temperature drops significantly, and the warm air is blown out from the ceiling duct into the passenger compartment. Therefore, it is possible to obtain a head-cooling and foot-heating effect that corresponds to the cabin temperature, and it is possible to ensure comfortable living during heating.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the air conditioning system of this invention, and FIG. 2 is a circuit diagram showing an embodiment of the invention. 1...Air conditioning duct, 23...Floor duct, 24...
...Ceiling duct, 25...Outside air introduction fan, 25
a, 25b...drive fan, 28...control device (determination means), 34...vehicle interior temperature sensor (room temperature detection means).

Claims (1)

[Scope of claim for utility model registration] A floor duct arranged on the floor of a vehicle interior, a ceiling duct arranged on the ceiling of the vehicle interior, and an air conditioner that supplies warm air to the floor duct and the ceiling duct. a duct, an outside air introduction fan that sends outside air into the ceiling duct, a drive device that drives the outside air introduction fan, a room temperature detection means that detects the temperature inside the vehicle interior, and a temperature detected by the room temperature detection means that is set to a predetermined value. determining means for determining whether or not the detected temperature is equal to or higher than a predetermined value; when the detected temperature is equal to or higher than a predetermined value, the driving device is operated so that the outside air introduction fan rotates at high speed to increase the amount of outside air introduced; When the detected temperature does not reach a predetermined value, the drive device is operated so that the outside air introduction fan rotates at a low speed to reduce the amount of outside air introduced.