JPH081934Y2 - Automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an air conditioner for an automobile, and more particularly to an air conditioner for an automobile capable of adjusting idle-up when an engine is idle.

[Conventional technology]

Conventionally, in a vehicle equipped with an automobile air conditioner (air conditioner, hereinafter referred to as an air conditioner),
When the air conditioner is turned on, the compressor that sucks and compresses the refrigerant gas to make it high temperature and high pressure becomes a load on the engine. Therefore, when the engine speed is low, the engine is stalled by idling up when the air conditioner is turned on.

When adjusting the idle-up speed of this air conditioner while the engine is under load (both the air conditioner compressor and the idle up device are on), the summer temperature remains adjusted in winter due to the atmospheric temperature during adjustment. In addition, there is a problem that the number of rotations becomes low because the load on the air conditioner becomes larger in the summer. Therefore, recently, the idle up adjustment is performed in a no-load state in which a load such as a compressor is not applied to the engine, and the idle speed is adjusted to the expected summer speed to improve the summer air conditioner effectiveness.

Then, in order to adjust the idle-up rotation speed when the air conditioner is turned on under no load, the following two methods are currently implemented.

(1) Turn on the air conditioner switch → disconnect the wiring of the compressor → adjust idle up → return the wiring of the compressor to its original state.

(2) Turn off the air conditioner switch → Connect the idle up valve pipe in the same way as when the air conditioner is turned on → Adjust idle up → Return the pipe to its original position.

It should be noted that normal idle adjustment must be performed before adjusting the idle-up rotation speed when the air conditioner is turned on in the above-mentioned no-load state. This normal idle adjustment method is performed as follows in an internal combustion engine provided with an electronically controlled fuel injection device (EFI), for example. Shorting the inspection terminal (T terminal) → Idle ignition timing adjustment (eg 10 ° BTD
C) → Adjust idle bypass flow rate (idle speed) → Open T terminal.

[Problems to be solved by the device]

However, the idle-up adjustment method when the air conditioner is turned on in the no-load state described above involves wiring and piping changes in any of the methods.Therefore, the wiring and piping must be restored after the idle-up adjustment. However, problems such as incorrect wiring and incorrect piping, forgetting to return the wiring and piping, and the like may occur, and secondary problems such as engine stall, idle hunting, and lack of cooling performance may occur.

The present invention solves the problems of the conventional idle-up adjusting method in the no-load state when the air conditioner is turned on, and makes it possible to adjust the idle state easily and accurately when the air-conditioner is turned on without changing wiring or piping. It is an object of the present invention to provide an air conditioner for an automobile capable of performing idle-up adjustment.

[Means for solving the problem]

The automotive air conditioner of the present invention that achieves the above-mentioned object guides a part of the fresh air on the upstream side of the throttle valve to the downstream side of the throttle valve according to the opening degree of the adjusting screw when the operation signal is input. Bending idle flow rate adjusting means, drive means for outputting an operation signal to the idle flow rate adjusting means and the compressor of the air conditioner when the switch of the air conditioner is on, and a check terminal turned on when adjusting the idle speed. When the inspection terminal is on, a compressor operation prohibiting unit that prohibits the operation of the compressor even when the switch of the air conditioner is on is provided.

[Action]

According to the vehicle air conditioner of the present invention, when the switch of the air conditioner is turned on with the inspection terminal short-circuited, the load such as the compressor is not connected to the engine,
The intake flow rate control mechanism that guides a part of the fresh air on the upstream side of the throttle valve to the downstream side of the throttle valve is in the same state as when the air conditioner is turned on. Therefore, it is possible to adjust the idle-up when the unloaded air conditioner is turned on.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the structure of an embodiment of the air conditioner for a vehicle of the present invention. In the figure, 1 is a compressor of a core controller, 2 is an air conditioner amplifier for driving the compressor 1, 3 is an air conditioner switch, and 4 is an engine control unit (ECU), which are components of the air conditioner. In addition, in this embodiment, the ECU 4
Is provided with an inspection terminal (T terminal) 5, and a relay 7 that is turned on and off by a drive circuit 6 is provided between the compressor 1 and the air conditioner amplifier 2.

On the other hand, a throttle valve 8 is provided in the intake passage 9 of the internal combustion engine 10, and an air cleaner 11 is provided upstream of the throttle valve 8. The clean side of the air cleaner 11 and the downstream side of the throttle valve 8 are connected by a pipe 12, and an idle up valve 20 for opening and closing the pipe 12 is provided in the middle of the pipe 12. The idle up valve 20 is composed of, for example, an upper casing 21 and a lower casing 22 with a diaphragm 23 sandwiched between them.
In the diaphragm chamber 25 between the diaphragm 23 and the diaphragm 23, a spring 24 for urging the diaphragm 23 toward the lower casing 22 is installed, and the lower casing 22 is attached to the tip of a rod 26 protruding from the diaphragm 23. A valve body 27 that opens and closes the pipe 12 is provided. Reference numeral 28 is an adjusting screw for adjusting the flow rate of air flowing through the pipe 12.

The idle-up valve 20 configured as described above is opened by the diaphragm 23 moving toward the upper casing 21 side against the spring 24 when the intake pipe negative pressure is introduced into the diaphragm chamber 25. The pipe 12 is made to communicate, and when the atmospheric pressure is introduced into the diaphragm chamber 25, the valve 12 is closed by the urging force of the spring 24 to shut off the pipe 12. Therefore, in the vicinity of the idle up valve 20, the diaphragm chamber 25
An electromagnetic three-way valve 30 for switching between the intake pipe negative pressure and the atmospheric pressure, which is guided to, is provided, and the diaphragm chamber 25 of the idle up valve 20 is provided with a switching port 31 of this electromagnetic three-way valve 30 via a pipe 14.
It is connected to the. In addition, the remaining 2 of this electromagnetic three-way valve 30
Of the two connection ports, one connection port 32 is connected to the downstream side of the throttle valve 8 in the intake passage 9 via the pipe 13, and the other connection port 33 is connected to the atmosphere. Further, the solenoid 34 of the electromagnetic three-way valve 30 is connected to the air conditioner amplifier 2. When the air conditioner switch 3 is off, the solenoid 34 of the electromagnetic three-way valve 30 is not energized from the air conditioner amplifier 2, and the electromagnetic three-way valve 30 is connected to the passage shown by "black"-"black" in the figure so that the idle-up valve is opened. Atmospheric pressure is introduced into the diaphragm chamber 25 of 20. When the air conditioner switch 3 is turned on, the solenoid 34 of the electromagnetic three-way valve 30 is energized from the air conditioner amplifier 2 so that the electromagnetic three-way valve 30 "White" -Idle up valve with the passage shown in "white" communicating
The intake pipe negative pressure is introduced into the diaphragm chamber 25 of 20 through the pipes 13 and 14.

In the vehicle air conditioner thus configured, normal idle-up when the air conditioner is turned on is performed as follows. That is, when the air conditioner switch 3 is turned on, the air conditioner amplifier 2 receives the ON signal and energizes the compressor 1 and the electromagnetic three-way valve 30. Then, the solenoid three-way valve
30 "white"-"white" communicate, so idle up valve
Intake pipe negative pressure is introduced into the diaphragm chamber 25 of 20 through the pipes 13 and 14, the idle up valve 20 is opened, and the pipe 12 is communicated. As a result, the fresh air on the clean side of the air cleaner 11 is passed through the pipe 12 as bypass air to the internal combustion engine 10
Is inhaled and the idle up is performed.

ECU4 when performing no-load idle up adjustment in this state
The operation procedure will be described with reference to the flowchart showing the idle adjustment routine of FIG. This routine may be executed in the main routine.

In step 201, it is first determined whether the T terminal 5 is on. When the T terminal 5 is on (YES), the routine proceeds to step 202, and when the T terminal 5 is off (NO), the routine proceeds to step 203.
In step 202, the fuel cut prohibition signal is output,
This is done to prevent the no-load adjustment of the air conditioner when the engine speed becomes high and the fuel is automatically cut when the idle switch (LL) is on in the idle state. Is. On the other hand, in step 203, it is determined whether or not the other air conditioner no-load condition is satisfied. When the other air conditioner no-load condition is satisfied (YES), the process proceeds to step 204, and the other air conditioner no-load condition is determined. If not established (NO), this routine ends. Then, in step 204, a compressor cut signal is output in order to perform idle adjustment of the air conditioner under no load.

The operation of the ECU 4 will be described with reference to FIG. When the air conditioner switch 3 is on, the compressor 1 and the electromagnetic three-way valve 30 are energized by the air conditioner amplifier 2, so the compressor 1 rotates and becomes a load of the internal combustion engine 10, and the electromagnetic three-way valve 30 idles the intake pipe negative pressure to an idle up valve. Since it is led to 20, the idle up valve 20 is opened and the fresh air on the upstream side of the throttle valve 8 is bypassed to the downstream side of the throttle valve 8 through the pipe 12. When the T terminal 5 is short-circuited in this state, the ECU 4 detects that the T terminal 5 is turned on and outputs a compressor cut signal to the drive circuit 6. The drive circuit 6 receiving the compressor cut signal turns on the relay 7 to cut off the power supply from the air conditioner amplifier 2 to the magnet clutch of the compressor 1. As a result, the compressor 1 is turned off.

Therefore, in this state, the air conditioner is turned on and the compressor 1 is turned off even in the idle-up state, so the no-load idle-up rotation speed adjustment screw is adjusted.
Adjustable at 28.

If the idle adjustment is performed in the following procedure, the normal idle adjustment and the idle-up adjustment when the air conditioner in the no-load state is turned on can be performed at the same time. That is, (1)
If the idle adjustment is performed in the order of turning on the T terminal 5, (2) adjusting the idle ignition timing, the number of revolutions, (3) turning on the air conditioner switch 3, (4) adjusting the idle up, and (5) turning off the T terminal 5. The normal idle adjustment and the idle-up adjustment when the air conditioner is turned on under no load can be performed at the same time. At this time, the adjustment speed is adjusted so that the idle speed when the air conditioner is on, which is required in summer, is obtained, and after the idle adjustment is performed in advance, the T terminal 5 is turned on and the compressor 1 is turned off, and the no-load idle-up speed is adjusted. (About 1300 to 1500rp
m).

Although the relay 7 and its drive circuit 6 are used as means for turning off the compressor 1 when the air conditioner switch 3 is on in the above-described embodiment, the compressor cut signal from the ECU 4 is input to the air conditioner amplifier 2. In this way, the compressor 1 may be cut by the circuit provided in the air conditioner amplifier 2 according to the compressor cut signal.

[Effect of device]

As described above, according to the vehicle air conditioner of the present invention, the idle-up speed of the air conditioner in the no-load state can be adjusted simultaneously with the normal idle adjustment.
There is an effect that it is possible to save the trouble for the adjustment, and it is possible to prevent the secondary trouble because the wiring and the pipe for the adjustment are not attached and detached.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing the configuration of an automobile air conditioner of the present invention, and FIG. 2 is a flow chart showing the operation of the ECU of FIG. 1 ... Compressor, 2 ... Air conditioner amplifier, 3 ... Air conditioner switch, 4 ... ECU, 5 ... Inspection (T) terminal,
6 ... Drive circuit, 7 ... Relay, 8 ... Throttle valve,
9 ... Intake passage, 10 ... Internal combustion engine, 12, 13, 14 ... Piping,
20 …… idle up valve, 30 …… electromagnetic three-way valve.

Claims (1)

[Scope of utility model registration request] 1. An idle flow rate adjusting means for guiding a part of fresh air upstream of a throttle valve to a downstream side of the throttle valve according to an opening degree of an adjusting screw when an operation signal is input, and an air conditioner. When the switch is ON, the drive means for outputting an operation signal to the idle flow rate adjusting means and the compressor of the air conditioner, the inspection terminal that is turned on when adjusting the idle speed, and the air flow control device when the inspection terminal is ON. An air conditioner for a vehicle, comprising: compressor operation prohibiting means for prohibiting operation of the compressor even when a switch of the conditioner is turned on.