JPS5948222A - Controller of car air conditioner - Google Patents

Abstract

PURPOSE:To contrive reduction of a power burden, by providing an adjusting device increasing an idling speed to a value larger than a basic speed by receiving an electric input signal. CONSTITUTION:A first adjusting device 2 increasing an idling speed is provided and an electric controller 11 practicing an increase of the idling speed by interlocking with big capacity selection of a second adjusting device 16 adjusting capacity of the compressor 1 in two steps is provided. As the idling speed is increased only when it is required corresponding to the capacity of the compressor as mentioned above, a power burden of an internal combustion engine is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is equipped with an internal combustion engine as a driving motive power, and obtains driving force for a refrigerant compressor of an air cooling system through a disconnectable coupling device from the internal combustion engine. This relates to a car air conditioner control device applied to a car air conditioner used as a car air conditioner. The aim is to appropriately control the rotational speed.

Conventionally, a typical car air conditioner control device has a refrigerant compressor that is connected intermittently via a coupling device, and is configured to operate the air cooling device intermittently. in this case,
When the compressor is in operation, a negative mechanical force is applied to the internal combustion engine, so in conjunction with the energization of the coupling device, it acts on the mixture supply device of the internal combustion engine to reduce the idle speed to 1W.
The so-called idle up mechanism (-J additionally installed)
are ′ and π.

The applicant has developed a variable capacity compressor that adjusts the refrigerant discharge capacity per stroke, thereby increasing the
・In addition to obtaining a cooling effect 315 of the main slope, it is intended to reduce fluctuations in the power load of the internal combustion engine. A bypass passage is provided on the wall of this variable displacement compressor, for example, to a variable shell that selects the capacity in two stages. By opening and closing, the compression stroke length can essentially be changed in two stages, and this two-stage adjustable compressor uses one solenoid valve to electrically adjust the capacity. Only -C has good advantages.

By the way, for example, when the above-mentioned two-stage adjustment type compressor is adopted, if the idle rotational speed is set to lVf (lVf) when the coupling device is energized and connected according to the above-mentioned typical prior art, the compressor will have a small capacity. If the compressor is operated at a high speed, it does not require a large cooling effect (there is no need to increase the rotational speed of the compressor that much), and even though the power load on the compressor itself is small, the idle speed is higher than necessary. Increase the speed・U
This results in a situation where the fuel consumption of the internal combustion engine (1) is wasted.

The present invention has been made in view of the above-mentioned problems.By increasing the idle rotation speed only when necessary in accordance with the capacity of the compressor, the power load on the internal combustion engine can be reduced. An object of the present invention is to provide a car air control device.

In the embodiments of the present invention described below, a first FIF4 section device for increasing the idle rotational speed is provided (), and the increase in the idle rotational speed is controlled by adjusting the capacity of the compressor in two stages.
The present invention is characterized by the provision of an electrical control device which operates in conjunction with the large capacity selection of the No. 12 regulating device.

The electric control circuit uses the control circuit that controls the variable capacity compressor as it is, and applies the output signal from the control circuit to the "j" - (dollar rotational speed increase adjustment device) through a special connection circuit. It is composed of

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In the accompanying drawing showing the overall configuration of this apparatus, reference numeral 1 is a variable capacity type refrigerant pressure tIiI machine, which is equipped with a machine 1142 for adjusting the refrigerant discharge capacity per stroke in two stages. Adjuster tF ¥2 is this compression z1! When the solenoid valve t provided in the bypass passage (not shown) is deenergized and closed, the compressor 1 is brought to full capacity (first capacity), and the solenoid valve is energized.
When C is opened, it is configured to have a capacity (second capacity) of '1'. Reference numeral 3 denotes a coupling device, which is a so-called electromagnetic clutch, which, when energized, couples the rotational force of an output shaft of an internal combustion engine (not shown) to the compressor 1 via a V-bell 1-.

To explain an air cooling system including a compressor 1, the refrigerant discharged from the compressor 1 is
The refrigerant circulates through the receiver 5, the expansion valve 6, and the J-turbator 7, returns to the compressor ta1, and then circulates through the C-cycle (refrigeration cycle), compresses and expands during this circulation process, and removes the heat of vaporization in the evaporator lake 7. Possibly evaporator 7
Reduce the surface and ambient temperature of the

The evaporator 7 is arranged horizontally in the air conditioning unit 8 (9J), and a blower device 9 is energized by an electric motor 10.
is generated and placed in the airflow towards the cabin.

The air conditioning units 1 and 8 act as a cooling device as shown, but if necessary, by providing an air mix type heating amount adjustment mechanism on the downstream side of the evaporator 8, it can be used as a temperature adjustment device with a dehumidifying function. can.

In this apparatus, a variable capacity compressor 1 is provided with an electric control circuit 11 so that its capacity can be adjusted according to the degree of cooling of the evaporative turbine.

For this purpose, the electric control circuit 11 is connected to a temperature sensor 12 that responds to the temperature of the air blown from the evaporator 7 (the surface temperature may be used if necessary), and in response to the detection signal of the temperature sensor 12, the connecting device 3 is attached. a first output signal S1 that is energized or deenergized; and a second output signal S2 that indicates the stage of the compressor capacity.
Outputs . The temperature sensor 12 is made of a resistance element, such as a thermistor, which has FAA degree dependence, and the electric control circuit 11 supplies voltage to the resistance element to generate a voltage across a plurality of preset J+i; 'l' voltages. The first output signal S1 and the second output signal S2 are generated by comparing the first output signal S1 and the second output signal S2. i'+ in the electric control circuit 11:
Although the electrical processing such as f[ is omitted, it can be realized using ordinary electronic technology.

Therefore, the electric control circuit If detects that the detection signal of the temperature sensor 12 is at the minimum level of 111.4 degrees of the evaporator tough.
When the set value indicating the temperature (e.g. O'C to 4°C) is lower than 1, the first output signal Sl is deenergized and
If the voltage is rising, the first output voltage S1 is energized.

In addition, the electric control circuit 17611 detects that the detection signal of the temperature sensor 9'12 indicates that the temperature of the evaporator trough is set to 1 [αj; , the second output signal S2 is activated, and when it is 1- higher than that, the second output signal S2 is deactivated.

For this reason, comparing the operation of the variable displacement compression till l with the degree of cooling of the evaporator 7, if the temperature of the evaporator trough rises above the intermediate rapid temperature, the coupling device 3 is energized and the adjusting mechanism Since the solenoid valve 2 is deenergized, the compressor 1 is operated at full capacity and cools the evaporator 7 at its maximum capacity. When the temperature of the evaporative lake 7 is higher than the reference temperature and higher than the lowest base temperature, the coupling device 3 is energized and the solenoid valve of the adjustment mechanism 2 is energized. Therefore, compressor 1 is operated at half capacity, and evaporator 7
is cooled at medium capacity. Furthermore, when the temperature of the evaporator lake 7 falls below the minimum JJ5i1% temperature, the coupling device 3 is deenergized and disconnected from the internal combustion engine, and the evaporator 7 stops its cooling action.

Power is supplied to the electric control circuit 11 from an on-vehicle DC battery 13 via a switch 14 that is linked to a key switch and a switch 15 that is linked to an operating switch of a car air conditioner.

Next, a description will be given of the regulating device for raising the idle rotational speed of the internal combustion engine above the thread bottom rotational speed. 16 is a flow rate adjustment valve, which is disposed in the bypass passage 11Pl l 7 that bypasses the thrower I valve of the internal combustion engine (not shown). ing. The opening degree of the adjustment valve 16 is determined by a link mechanism 18B that moves 10 degrees in response to the displacement of the output rotor I' of the negative actuator 18.The negative actuator 18 is a known diaphragm actuator. , the position of the output lot can be sucked by one step from the specified value (extended state).

Therefore, when the output terminal is at the fixed position C, the flow rate regulating valve 16 is at its base opening, and the idle rotational speed of the internal combustion engine is (bottom rotational speed -C).

The negative pressure actuator 18 has a solenoid valve 2 in the middle of the path of the negative pressure conduit 19.
0, and when the electromagnetic valve 20 is energized to open, the output rond is sucked, and the flow rate of the bypass passage is increased by opening the flow rate adjustment valve 16 to a predetermined degree from the base state or every time it is opened. The rotational speed of the idler 1' can be increased to a predetermined speed.

Reference numeral 21 denotes a connection circuit which allows the output signal of the electric control circuit 11 to be sent to the coupling device W3 and the adjustment mechanism 2, and also connects the solenoid valve 19 with a predetermined condition ('I gives a J-energization, de-energization signal. In other words, the energizing circuit of the electromagnetic block 19 is connected at the node CI to the transmission line of the first output signal S1 that determines the energization and deenergization of the coupling device 3, and is connected to the transmission line of the first output signal S1, which determines the energization and deenergization of the coupling device 3, and is a normally closed relay. They are connected via a contact 22.The relay contact 22 is opened by the energization of a relay coil 23.
The relay coil 23 is connected in parallel with the second output signal S2 so as to be energized and deenergized by the same line 1!1. Note that the connection circuit 21 can be housed together with the electric control circuit 11 in a common electric circuit package.

The structural feature of this device is that the output signal of the electric control circuit 1rδit generates a first output signal S1 and a second output signal S.
2, the coupling device 3 is switched on and off, and the capacity of the compressor 1 is adjusted in two stages, and at the same time, the coupling device 2 is energized by the connecting circuit 21, and the articulation mechanism 2 is switched off as much as possible to reach its full capacity. The idling rotational speed is increased by energizing and energizing the solenoid valve 19 only under conditions where the relay contact 22 is closed.

To explain in more detail, the temperature is -1! When the degree of cooling detected by the switch 12 indicates a sufficiently cooled state, the coupling device 3 is de-energized by the first output terminal Sl, and in this case, the electromagnetic valve 1-19 is also de-energized, so that the A.I. 1 nil rotation speed is base rotation j8I! There is degree-C.

When the degree of cooling is intermediate -C, the rC+1 output signal S1 energizes the coupling device 3, or at the same time the second
The output signal S2 is J,su,il! lI 4 & l戊I1
1'j 2 solenoid valve is energized, compressor ■ is half-1'))
It is operated with a capacity of

In this case, the relay coil 23 is also energized and the relay contact 22
Since the solenoid valve 10 is opened, the solenoid valve 10 remains deenergized. Therefore, IJ soil 1 degree is 1 degree! , (five (J
The upper nail remains.

Next, when the degree of cooling is completely insufficient, the second output signal S2 is deenergized while the coupling device ♂3 (=J is activated by the f(j l output signal S1), and the adjustment ti11. IM 2
Since the solenoid valve of
be driven. In this case, since the relay coil 23 is deenergized, the relay contact 22 is closed, and therefore the solenoid valve 19 is energized. Therefore, the opening degree of the flow rate regulating valve 1G is opened to the set opening degree by the negative pressure actuator (8), and the idle rotational speed of the internal combustion engine is increased.

In the embodiment described above, the electric control circuit 11 has the highest temperature and intermediate temperature. 1 (of course it is possible to set the steresis by r% in the temperature setting).

In addition, in the three major embodiments, OJ variable displacement compressor binding (i
Although the description has been given of a case in which the liI adjustment mechanism reaches full capacity when deenergized, the present invention can also be applied to a device which attains full capacity when energized. For example, in the configuration shown in FIG. 1, if the C1 adjustment mechanism 2 has full capacity when energized, the relay contact 22 is a normally open contact that closes when the relay coil 23 is energized. good.

Further, in the present invention, how much the capacity is reduced is not critical to the present invention, and it goes without saying that it can be set to an appropriate value. Also, the control parameter for adjusting the capacity is Evaporake 7's IX! A means that responds not only to the evaporation pressure, such as a pressure switch, but also to the air temperature in the cabin or the outside air, may be used. Depends on your AA degree-U.
) and C also J, i.

1. In the present invention, 1, 11, II.
By linking a J-type compressor and a stepwise increase in idle rotational speed, a simple configuration can be realized and excellent effects can be achieved.

[Brief explanation of the drawing]

The attached drawings show the entire embodiment of the present invention (1"η configuration 121. 1...Compression 1H 1.2...Adjustment 1X 11X (EB
2 regulating device), 3... Connecting device, 7... Evaporation lake, 11... 7h air control circuit, 16... Flow rate regulating valve (second, 11.1-eye and device), 18 ...Negative pressure actuator, 21・If: 4;,'a Open circuit attorney Takashi Okabe

Claims (2)

[Claims] (1) A car air conditioner applied to a car air conditioner that is equipped with an internal combustion engine as the driving engine and obtains the driving force of the refrigerant compressor of the ζ air cooling system from the internal combustion engine through an intermittent connection AA device. a first adjusting device which increases the idle rotational speed of the internal combustion engine to a value greater than the base rotational speed by receiving an electric human power signal; - a 20th) adjusting device for changing and adjusting the refrigerant discharge capacity per stroke of the compressor described in C1iil, and electrically controlling the selection of the capacity of the second adjusting device and the connection and disconnection of the connecting device; Does the compressor operate in conjunction with a predetermined capacity? an electric control device that controls the first adjustment device to increase the idle rotational speed when the idling speed is increased. (2) the first regulating device comprises an electro-mechanical converter acting on the air-fuel mixture supply mechanism of the internal combustion engine; Claim 1 comprising a connection circuit adapted to transmit a capacitance selection signal of said second Section 661 device under conditions in which a device energization signal is present.
The car air conditioner control device described in .