JPH05193350A - Air-conditioner control device for automobile - Google Patents

Abstract

PURPOSE:To shorten the time of the stop or the output drop of a compresser in the case of the stop or the output drop of the compresser of an air- conditioner when an automatic transmission is operated in a range for running. CONSTITUTION:The operation status of a compresser is maintained until the lapse of a first prescribed time after the select operation start from the range for non-running to the range for running. When the first prescribed time is lapsed, the compresser is made off. The time shorter than the time spent upto the start of the action of a load to an engine after starting the fastening of an automatic transmission actually is set as the first prescribed time. Therefore, the operation time of the compresser can be lengthened without the generation of an engine stop and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner control device.

[0002]

2. Description of the Related Art As a conventional vehicle air conditioner control device, there is one disclosed in Japanese Patent Laid-Open No. 63-263127. In the case of a vehicle equipped with an air conditioner, if the selector device of the automatic transmission is operated from the N range to the D range while the air conditioner is operating, the automatic transmission is added to the load of the compressor of the air conditioner. The engine may stop due to the sudden load. In order to prevent this, in the above publication, when the selection operation is performed from the N range or the like to the traveling range such as the D range or the like, the operation of the compressor is immediately stopped or the output is reduced.

[0003]

However, in the conventional vehicle air conditioner control device as described above, when the selection operation from the N range to the D range is performed, the compressor of the air conditioner immediately stops. There is a problem that the compressor is stopped for a longer time than necessary. That is, even if a select operation is performed,
Although there is a time delay before the friction engagement element of the automatic transmission is actually engaged and the engine starts to be loaded, the compressor operation also stops during this time, and the function of the air conditioner is extra by this amount. Will be damaged. The present invention aims to solve such problems.

[0004]

The present invention solves the above problems by continuing the operation of the compressor for a predetermined time even if a select operation is performed. That is, as shown in FIG. 1, the vehicle air conditioner control device according to the present invention includes a select detection unit that detects that the select device of the automatic transmission is selected from the non-running range to the running range. The compressor operation limiting means for stopping the operation of the compressor of the air conditioner or reducing the output when a first predetermined time has elapsed since the select detecting means detected the select operation, and the select detecting means detects the select operation. And a compressor operation returning means for bringing the compressor into a normal output state when a second predetermined time has elapsed, and the friction engagement element of the automatic transmission is actually engaged from the selection operation for the first predetermined time. Is set to a time shorter than the time until the start of the Fastening is complete engine frictional engagement element of the transmission is set longer than the time until a stable state. Instead of the elapsed time from the selection operation, the start and end of the fastening can be detected from the change in the input shaft rotation speed associated with the fastening operation.

[0005]

When the first predetermined time elapses after the selection operation for enabling traveling is performed, the compressor of the air conditioner stops its operation or reduces its output. Since the first predetermined time is shorter than the time until the fastening operation of the automatic transmission is actually started, when the load of the automatic transmission starts to operate, the operation of the compressor is stopped or the output is reduced. Therefore, the engine will not stop. Since the compressor is operating until the first predetermined time elapses, the influence on the function of the air conditioner is reduced by this time. When the second predetermined time has elapsed, the compressor returns to the normal state.

[0006]

EXAMPLE As shown in FIG. 2, a control unit 1
A signal from the select position switch 12 is input to 0. The control unit 10 can output a signal for controlling the operation of the compressor 14 of the air conditioner. The control unit 10 controls the operation of the compressor 14 according to the control flow shown in FIG. That is, first, it is determined whether or not the compressor 14 is on (step 100), and if it is on, it is determined whether or not the select position of the select position switch 12 was the N or P range in the previous routine (step 102), If it is in the N or P range, it is determined whether or not it is in the range other than the P and N ranges in this routine (step 104). When the range other than the P range and the N range is set in this routine, that is, when the selection operation to the running range is performed, the timer T is started (at step 106). Then
It is determined whether or not the timer T has reached the first predetermined time T1 (108), and the compressor 14 is kept on until the T1 time elapses (112). On the other hand, T
When one hour has passed, it is determined whether the second predetermined time T2 has passed (at 110), and the compressor 14 is turned off until the second predetermined time T2 has passed (at 114). After the elapse of the second predetermined time T2, the compressor 14 is turned on again (step 112). After all, by the control shown in FIG.
The compressor 14 of the air conditioner is turned off during the first predetermined time T1 and the second predetermined time T2. As the first predetermined time T1, the select position switch 12
A time period (for example, about 1 second) is set from the time when the automatic transmission is switched to the time when the forward clutch of the automatic transmission is filled with hydraulic pressure and immediately before the engagement operation of the automatic transmission is actually started. Further, the second predetermined time T2 is set to a time (for example, about 5 seconds) until the automatic transmission is in a traveling state and a load is applied to the engine to bring the engine into a stable state. Therefore, the operation of the compressor 14 is stopped only while the load of the engine changes due to the selection operation. The above T1 and T2 times can be set as a function of the engine speed.

Next, a second embodiment shown in FIG. 4 will be described. When the select position switch 12 is switched from the N or P range to the traveling range in this routine (steps 100, 102, 104), the turbine rotation speed Nt (this is equal to the input shaft rotation speed to the automatic transmission). Is smaller than the first predetermined value N1 (at 120), and if Nt is greater than N1, the compressor 14 is kept on (at 112), while Nt
Is smaller than N1, Nt is the second predetermined value N2.
If it is smaller than (which is a value smaller than N1) (122), and if larger than N2 (that is, if Nt is between N2 and N1), the compressor 14 is turned off (114). On the other hand, when Nt is smaller than N2, the timer T is started (at step 106), and it is determined whether the timer has passed the third predetermined time T3 (at step 110).
The compressor 14 is turned off until 3 has passed (see 1
12), after the elapse of the third predetermined time T3, the compressor 14 is turned on (at step 114). The first predetermined value N1 is set to the rotational speed at which the frictional engagement element of the automatic transmission actually starts the engagement, and the second predetermined value N2 is the rotational speed at which the engagement of the frictional engagement element of the automatic transmission is completed. Is set,
The third predetermined time T3 is set to a time slightly longer than the time from the completion of the engagement of the frictional engagement elements of the automatic transmission to the stable state of the engine. After all, if the turbine rotational speed is lower than N1 when the select position switch 12 is switched to the traveling range by the above control, the compressor 14 is turned off. The off state of the compressor 14 is the third predetermined time T
It is held until 3 has passed.

Next, a third embodiment shown in FIG. 5 will be described. In the third embodiment, steps 130 and 132 are added to the second embodiment shown in FIG. That is, it is determined in step 130 whether the vehicle speed V is smaller than the predetermined value V0, and in step 132 it is determined whether the throttle opening TH is smaller than the predetermined value TH0, and the vehicle speed is smaller than the predetermined value. In addition, when the throttle opening is smaller than a predetermined value, the same control as that shown in FIG. 4 is performed. As a result, the control for turning off the compressor 14 is not performed during traveling and when the engine is in a sufficiently loaded state.

[0009]

As described above, according to the present invention, the compressor is not turned off until the load actually acts on the engine even if the select operation is performed, so that the engine is stopped. The air conditioner can be made to function as much as possible within the range that does not occur.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between components of the present invention.

FIG. 2 is a diagram showing an example of the present invention.

FIG. 3 is a diagram showing a control flow.

FIG. 4 is a diagram showing a control flow of the second embodiment.

FIG. 5 is a diagram showing a control flow of the third embodiment.

[Explanation of symbols]

 10 Control Unit 12 Select Position Switch 14 Compressor

Claims (3)

[Claims] 1. A select detecting means for detecting that a select device of an automatic transmission has been selected from a non-running range to a running range, and a first predetermined time after the select detecting means detects the select operation. Compressor operation limiting means for stopping the operation of the compressor of the air conditioner or decreasing the output when a predetermined time elapses, and a normal output of the compressor when a second predetermined time has elapsed since the select detecting means detected the select operation. The first predetermined time is set to be shorter than the time from the selection operation until the frictional engagement element of the automatic transmission actually starts the engagement. The second predetermined time is from the selection operation described above until the engagement of the friction engagement elements of the automatic transmission is completed and the engine becomes stable. Automotive air conditioner control device that is set to a time longer than the time. 2. A select detecting means for detecting that the select device of the automatic transmission has been selected from a non-traveling range to a traveling range, and an automatic transmission of the automatic transmission after the select detecting means detects the select operation. Compressor operation limiting means for stopping the operation of the compressor of the air conditioner or reducing the output when the input shaft rotation speed becomes lower than the first predetermined value, and the input shaft rotation speed of the automatic transmission is lower than the second predetermined value. And a compressor operation return means for bringing the compressor into a normal output state when a third predetermined time has elapsed from when the input shaft rotational speed has become smaller, and the first predetermined value of the input shaft rotation speed is the friction engagement element of the automatic transmission. Is set to the rotational speed at which the actual engagement is started, and the second predetermined value of the input shaft rotational speed is the rotational speed at which the engagement of the frictional engagement element of the automatic transmission is completed. Degree is set, and the third predetermined time is set to be longer than the time from the completion of the engagement of the friction engagement elements of the automatic transmission to the stable state of the engine. apparatus. 3. The compressor operation limiting means and the compressor operation returning means operate when at least one of a vehicle speed and an engine load is equal to or less than a predetermined value.
Alternatively, the vehicle air conditioner control device according to item 2.