JPS63227942A - Room cooling device for vehicle - Google Patents

Abstract

PURPOSE:To permit room cooling in a car to be effectively performed, by increasing an idling speed of a running engine, which serves also for a driving source of a refrigerant compressor for a refrigerating cycle, when a vehicle of bus or the like detects its door to be placed in an opening condition. CONSTITUTION:A blower switch 25 is in a closed condition, and if a room cooling switch 26 is turned on, a device controls a relay coil 31 to be electrified through a control circuit 30, conducting an electric current to an electromagnetic clutch 4 and an electric-motor driven fan 6. In this way, the device, placing the electromagnetic clutch 4 in an on-condition, drives a refrigerant compressor 3 by an engine 1. Under this condition, a vehicle stops, and if an idling speed of the engine 1 decreases to a predetermined value or less, the device increases the speed of the engine 1 to the first idle-up speed through an idle-up function unit 14. Next the device, if a door for getting on and off is detected to be opened by an opening and closing switch 28, increases the engine speed to the second idle speed through an idling speed increasing means 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle cooling system driven by a vehicle running engine, and is particularly applicable to vehicles such as route buses where the entrance/exit door is opened and closed many times or is open for a long time. It is suitable for use.

[Prior Art] In a cooling system in which a refrigerant compressor is driven by a driving engine, when the cooling system operates during idling, the idling speed of the engine decreases, so the refrigerant compression capacity of the refrigerant compressor decreases. The cooling capacity of the air conditioner is insufficient, and the load on the engine increases due to the drive of the refrigerant compressor, which can easily cause engine stalling.Furthermore, since the amount of charge in the battery is small when idling, the balance between charging and discharging the battery is in the discharge range. There are problems such as easy battery drain.

In order to solve these problems, conventional vehicle cooling systems have been provided with an idle-up device that increases the idling speed of the engine when the cooling system is in operation.

[Problems to be solved by the invention] However, in vehicles such as route buses, where the door is opened and closed many times or the door is open for a long time, when the door is opened, the cold air inside the passenger compartment is It is equipped with an interstitial point where the air is discharged more outside the vehicle, reducing the cooling effect inside the vehicle. this]81
In order to solve one problem, it is possible to increase the idle-up rotation speed, but in order to operate the transmission smoothly when starting the vehicle, there is a limit to the idle-up rotation speed, and it is necessary to increase the idle-up rotation speed beyond that limit. It had the problem of not being able to increase the idle speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling device that can increase cooling capacity when a door is opened without interfering with the operation of a transmission when the vehicle starts.

[Means for Solving the Problems] The present invention provides a refrigeration cycle including a refrigerant compressor driven by a vehicle running engine, an open state detection means for detecting an open state of a door, and an idling rotation speed of the engine. A technical means is adopted comprising an idling speed increasing means for increasing the idling speed, and a control circuit for operating the idling speed increasing means when the open state detecting means detects the open state of the door.

[Function] According to the present invention having the configuration described in item 1, when the door of the vehicle is in the open state while the air conditioner is in operation, when the open state detection means detects that the door is in the open state, the control circuit adjusts the idling rotation speed. The raising means is activated, and the idling speed of the engine is increased. As a result, the refrigerant compression capacity of the refrigerant compressor increases, and the cooling capacity of the refrigeration cycle increases. On the other hand, when the vehicle starts, the door is closed and the idling speed of the engine decreases, so that the gear change operation of the transmission can be performed smoothly.

[Effects of the Invention] According to the present invention, the cold air discharged from the door to the outside of the vehicle can be supplemented to sufficiently cool the interior of the vehicle, and the smooth operation of the transmission when the vehicle is started is not hindered.

[Example] Next, an explanation will be given based on an example in which the vehicle cooling device of the present invention is applied to a route bus.

FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle cooling system according to the present invention.

The engine 1 is used for driving a route bus, and is also used for driving a refrigerant compressor 3 forming a part of a refrigeration cycle 2.

The refrigerant pressure &i machine 3 controls the rotation of the engine 1 using an electromagnetic clutch 4.
transmitted by. The electromagnetic clutch 4 transmits the rotation of the engine 1 to the refrigerant compressor 3 as necessary, and stops or drives the refrigerant compressor 3. The refrigerant compressor 3 sucks and compresses the refrigerant in the refrigeration cycle 2, and the gaseous refrigerant made high temperature and high pressure by compression is sent from the refrigerant compressor 3 to the condenser 5.

The condenser 5 is for discharging the heat of the refrigerant to the outside, and the condenser 5 is equipped with an electric fan 6 for promoting the heat dissipation effect of the condenser 5. The refrigerant is cooled here to become a liquid refrigerant and flows into the receiver 7.

The receiver 7 separates the inflowing refrigerant into a gas phase refrigerant and a liquid phase refrigerant, and discharges only the liquid phase refrigerant. The liquid refrigerant discharged from the receiver 7 is cut off when passing through the expansion valve 8!
8 expands, becomes a mist of refrigerant, and flows into the evaporator 9.

The refrigerant that has flowed into the evaporator 9 absorbs heat from the outside, evaporates, and cools the surrounding air. The refrigerant that has evaporated into a gaseous state is sent to the refrigerant compressor 11 and the cold tofu compressor 3, and the above cycle is repeated.

The evaporator 9 is disposed within a ventilation duct 11 that generates an air flow toward the vehicle interior 10. This ventilation duct 1
Upstream of the air conditioner 1, there is provided an inside/outside air switching means for selecting air inside the vehicle interior or outside the vehicle interior using an inside/outside air switching damper 12. Between this internal/external air switching means and the evaporator 9,
A blower motor 1 that generates airflow toward the vehicle interior 10
3 is provided.

On the other hand, the engine 1 has an idle-up function 1 that increases the rotation speed of the engine 1 to a first idle-up rotation speed R8 that does not interfere with smooth operation of the transmission when the vehicle starts.
4 is provided. As shown in FIG.
a first negative pressure actuator 18 that drives the lever 16 with negative pressure guided from the intake pipe 17;
When energized, the first negative pressure actuator 18
a first negative pressure switching valve 19 that supplies atmospheric pressure to the first negative pressure actuator 18 when de-energized;
It is composed of.

In addition, the engine 1 is equipped with an engine 1 with a speed setting that keeps the idling speed of the engine 1 at a level that sufficiently cools the interior of the vehicle, even when the bus vehicle is stopped, the passenger door is opened, and the cold air inside the vehicle is released from the passenger door. 2. Idling rotation speed increasing means 20 is provided to increase the idle rotation speed to R2. This idling speed increasing means 20 has the same configuration as the idle up function 14, and as shown in FIG. Operated by pressure,
A second negative pressure actuator 21 that drives this lever 16
, the second negative pressure actuator 21 is energized.
and a second negative pressure switching valve 22 that supplies atmospheric air to the second negative pressure actuator 21 when de-energized.

A blowout air temperature sensor 23 is installed downstream of the evaporator 9 to detect the temperature of the cold air obtained by passing through the evaporator 9. Further, an inside air temperature sensor 24 is provided in the vehicle interior 10 to detect the temperature of the vehicle interior 10.

The control panel of the vehicle includes a blower switch 25 that is a power switch for the blower motor 13, a cooling switch 26 for operating the refrigeration cycle 2, and a switch 25 for operating the refrigeration cycle 2.
There is an indoor temperature setting resistor 21 for setting the temperature of the room.

The passenger door of the bus vehicle is opened and closed by an opening/closing switch 28. In this embodiment, the opening/closing switch 28 is used as an open state detection means for detecting the open state of the passenger door.

Further, the engine 1 is equipped with a rotation speed detection means 29 that detects the rotation speed of the engine 1.

electromagnetic clutch 4, electric fan 6, first negative pressure switching valve 19,
The second negative pressure switching valve 22 is energized and controlled by the control circuit 30 . This control circuit 30, as shown in FIG. Use as input signal. Note that the electromagnetic clutch 4 and electric fan 6 described in 1.1-
is connected to the relay contact 32 of the relay coil 31 and is controlled by the control circuit 30.
It operates depending on the energization state of the In addition, 33 shown in the figure shows a power supply, and 34 shows a fuse.

The control circuit 30 is configured such that the relay coil 31 is energized and the idling speed of the engine 1 is a predetermined speed R0.
When the pressure decreases to , the first negative pressure switching valve 19 is energized. Further, the control circuit 30 energizes the second negative pressure switching valve 22 when the relay coil 31 is in the energized state and the open/close switch 28 is in the open state.

The cooling device of this embodiment having the above configuration operates as follows.

When the vehicle occupant turns on the blower switch 25, the blower motor 13 is energized and operates. Then, the air inside the vehicle or outside the vehicle, which is set by the inside/outside air switching damper 12, passes through the evaporator 9 and is transferred to the interior of the vehicle 10.
The air is discharged and air is blown.

With the blower switch 25 turned on, the air conditioner switch 26
When the control circuit 30 is turned on, the control circuit 30 is activated and controls the relay coil 31 to be energized according to the outlet air temperature sensor 23, the inside air temperature sensor 24, and the room temperature setting resistor 27. When relay coil 31 is energized, relay contact 32 is closed, and electromagnetic clutch 4 and electric fan 6 are energized. When the electromagnetic clutch 4 is energized, the engine 1 is connected to the refrigerant compressor 3.
The rotation of the refrigerant compressor 3 is transmitted, and the refrigerant compressor 3 is driven. When the refrigerant compressor 3 is driven, the refrigeration cycle 2 is activated and the air flowing through the ventilation duct 11 is cooled as it passes through the evaporator 9.

Next, based on the solid line A of the time chart shown in FIG.
Explain the operation.

The vehicle stops with the relay coil 31 energized,
At time t1 shown in FIG. 4, when the idling speed of the engine 1 drops below the predetermined speed R9, the control circuit 30
The first negative pressure switching valve 19 is energized by the operation, and the idling speed of the engine 1 increases to the first idling up speed R.
，It rises to the point where it becomes idle and deaf. Then, the refrigerant compression capacity of the refrigerant compressor 3 increases compared to the state in which idle-up is not performed, and the cooling capacity of the refrigeration cycle 2 increases.

When the opening/closing switch 28 opens the passenger door at time L2, the switch 28 closes and the signal is sent to the control circuit 30.
The second negative pressure switching valve 22 is energized by the operation of the control circuit 30, and the idling speed of the engine 1 increases to the second idling speed R2. Then, the refrigerant compression capacity of the refrigerant compressor 3 further increases. Therefore,
The airflow passing through the evaporator 9 is further cooled, supplementing the cold air discharged from the passenger door to the outside of the vehicle interior, and can sufficiently cool the vehicle interior 10.

When the passenger door is closed at time t3, the control circuit 30 stops energizing the second negative pressure switching valve 22, and the rotational speed of the engine 1 decreases to the first idle-up rotational speed R□. Therefore, the transmission can be operated smoothly when starting the vehicle.

Of course, even if the door is opened or not, if the temperature in the vehicle interior 10 is below the set temperature, the power to the relay coil 31 is cut off, and the engine 1 Since the rotational speed of the engine falls to the predetermined rotational speed R6, idle error 1 is not performed.

Note that the broken line B in FIG. 4 indicates the engine rotation speed when the cooling operation is not performed.

In this embodiment, an open/close switch for the passenger door is used as the open state detection means for detecting the open state of the door, but a mechanical sensor that closes or opens a circuit when the door is opened, an optical sensor, etc. that detects the open state may also be used. May be used.

Although this embodiment is applied to a route bus, it may also be applied to other vehicles such as a sightseeing bus or a passenger car.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of this embodiment, Fig. 2 is a schematic diagram of the idling rotation speed increasing means and idle up function, Fig. 3 is an electric circuit diagram for controlling the energization fli of this embodiment, and Fig. 4 The figure is a time chart for explaining the operation. In the diagram 1...Engine 2...Refrigerating cycle 3.
... Refrigerant compressor 14 ... Idle up function 20
...-Idling speed increase means 28...Open 11
1 switch 30...control circuit

Claims (1)

[Scope of Claims] 1) A refrigeration cycle equipped with a refrigerant compressor driven by a vehicle running engine, an open state detection means for detecting an open state of a door, and an idling speed for increasing the idling speed of the engine. when the number increasing means and the open state detecting means detect the open state of the door,
A cooling device for a vehicle, comprising a control circuit for operating the idling speed increasing means.