JPH0731423U - Air conditioner control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an air conditioner control device that suppresses fluctuations in idle speed. A load detecting means 21 for detecting the load of the compressor 5 of the air conditioner is provided, and an operation switch 25 of the air conditioner is turned on according to the load of the compressor 5 detected by the load detecting means 21. An air conditioner control device comprising delay means 22 for changing a delay time provided between a time point and a start time of starting the compressor 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for an air conditioner (hereinafter simply referred to as an air conditioner) used in a vehicle or the like.

[0002]

[Prior art]

 In conventional air conditioner control devices, when the air conditioner operation switch is turned on when the engine is idle, the opening of the throttle valve that controls the intake air amount of the engine is increased to increase the idle speed and By starting the compressor of the air conditioner after a certain delay time from the time when the operation switch is turned on, it is possible to prevent the engine from stalling drastically and reducing idling speed at the start of air conditioner startup. (Japanese Utility Model Publication No. 61-25550)

[0003]

[Problems to be solved by the device]

 However, due to the presence or absence of clogging of the condenser in the refrigeration cycle, or in summer and winter when there is a significant difference in outside temperature, the operating capacity of the condenser changes and the load on the compressor changes. That is, in summer when the outside temperature is high, the working gas pressure of the compressor increases and the load of the compressor and so on increases, and the load of the engine also increases. When the delay time is set to a constant value, the rate of increase in engine speed within this delay time is almost the same, so the engine speed at the start of compressor startup is almost the same, and The decrease of the number becomes large. On the other hand, when the outside air temperature becomes low, the working gas pressure of the compressor drops, and the load on the compressor decreases, the load on the engine also decreases and the rotation speed after starting the compressor rises excessively. Therefore, there is a problem in that the engine speed increases or decreases depending on the magnitude of the compressor load, or if it is significant, engine stall occurs. The present invention aims to solve these problems.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides an air conditioner control device in which a delay time is provided between the ON time of the operation switch of the air conditioner and the start start time of the compressor of the air conditioner driven by the driving force of the engine. It is characterized in that a load detecting means for detecting the load of the compressor is provided, and a delay means for changing the delay time is provided according to the load of the compressor detected by the load detecting means.

[0005]

[Action]

 According to the above configuration, when the air conditioner switch is turned on, the engine speed increases due to the normal idle-up mechanism, but on the other hand, when the load of the compressor detected by the load detection means of the air conditioner compressor is large. Since the delay time from the switch-on time to the compressor start-up time can be set long, the increase in the engine speed within this delay time becomes high, and the engine speed at the time the compressor is started becomes higher. The decrease is suppressed. Further, when the load of the compressor is small, the delay time can be set to be short, so that the increase in the engine speed within the delay time is low, and the engine speed when the compressor is started is also low. Excessive rise is prevented.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a system in which the present invention is applied to an electronically controlled engine used in an automobile. The engine 1 is configured to calculate the amount of air taken into the combustion chamber from the intake pressure on the downstream side of the throttle valve 2 and the engine speed, and to supply the fuel according to the calculated amount of intake air through the injector. ing.

The compressor 5 of the air conditioner attached to the engine 1 is driven by the driving force transmitted from the crank shaft of the engine 1 via a V-belt or the like. An electromagnetic clutch 7 is provided between the compressors 5 and is controlled so that the electromagnetic coil of the electromagnetic clutch 7 is energized only when the air conditioner is operating to connect the pulley 6 side and the compressor 5. In order to increase the idle speed of the engine 1 when the air conditioner is in operation, a bypass passage 3 that bypasses the throttle valve 2 is provided, and an opening / closing valve 4 that opens and closes the passage 3 is provided in the bypass passage 3. ing. The compressor 5 is provided with a pressure pickup 8 for detecting the pressure of the working gas of the compressor, and the pressure signal a detected by this is applied to the load detecting means 21.

By the way, since the relationship between the gas pressure of the compressor of the air conditioner and the load applied to the compressor at this time is almost directly proportional, the signal a of the gas pressure detected by the pressure pickup 8 is the load detection means 21. Immediately after the application, the load of the compressor 7 is uniquely determined. The delay means 22 has a delay time T from the time when the air conditioner operation switch 25 is turned on to the time when the compressor 5 starts to operate as a delay time T, and a delay time T corresponding to the load of the compressor 5 is built in as a map. The delay time T corresponding to the load determined by the load detecting means 21 is read from the map and the delay time T is set. When the switch-on signal b is input to the delay means 22, the counter that counts up every predetermined time counts up until the preset delay time T is reached. The means 22 sends a signal e to the electromagnetic clutch 7 of the air conditioner to activate the compressor 5. Further, the switch state detecting means 23 determines whether the operation switch 25 is on or off, and when it is determined that the operation switch 25 is turned on, the switch state signal b is sent to each of the delay means 22 and the idle-up control means 24 described later. , C are sent. On the other hand, when the switch-on signal c is input to the idle-up control means 24, the idle-up control means 24 sets idle-up conditions such as when the engine 1 is idle and the air conditioner operation switch 25 is turned on. It is configured to determine whether or not it is satisfied, and when it is determined to be satisfied, send a signal d to the on-off valve 4 to open the on-off valve 4 arranged in the bypass passage 3.

With such a configuration, the operation of each part under control is shown in the time chart of FIG. That is, when the operation switch 25 of the air conditioner is turned on, the switch state detecting means 23 sends the switch-on signals b and c (FIG. 2 (A)) to the delay means 22 and the idle-up control means 24, When the engine 1 is idle, the idle-up control means 24 to which the signal c is input determines whether or not an idle-up condition such as the operation switch 25 being operated is satisfied. When it is determined that the idle-up condition is satisfied, the throttle The on-off valve 4 provided in the bypass passage 3 of the valve 2 is opened (FIG. 2 (B)) to open the bypass passage 3 and increase the idle speed of the engine 1. (Fig. 2 (D))

On the other hand, when the ON signal b of the operation switch 25 is input to the delay means 22, the counter provided in the delay means 22 starts counting up every predetermined time. At the same time, the working gas pressure of the compressor 5 is detected by the pressure pickup 8 arranged in the compressor 5 of the air conditioner, and the pressure signal a is applied to the load detecting means 21, and the load detecting means 21 detects the pressure value. The load value of the compressor corresponding to the above is determined, and the signal f of the load value is input to the delay means 22. The time corresponding to the input load value is read from the map, set as the delay time T, and the counter is counted up until the time T is reached. Then, when the count-up is completed, a start signal e (FIG. 2C) is sent to the electromagnetic clutch 7 to engage the electromagnetic clutch to start the compressor 5. That is, the air conditioner compressor 5 is started with a delay time T from the time when the operation switch 25 is turned on. The above is the case where the load of the compressor is large, but when the load is small, the delay time becomes T1 and the engine speed also becomes low as indicated by the broken line. In this embodiment, an example in which the idle-up is controlled by the opening / closing valve 4 provided in the bypass passage 3 of the throttle valve 2 of the electronic engine 1 is not limited to this, but the opening of the throttle valve of the carburetor engine is not limited to this. It is also possible to control the idle-up by increasing or decreasing a predetermined amount during idling.

[0011]

[Effect of device]

 The present invention has the following effects. When the operation switch of the air conditioner is turned on, the engine speed increases due to the normal idle-up mechanism, but the operating gas pressure of the compressor rises and the load on the compressor increases in summer when the outside temperature is relatively high. If it is large, the delay time from the switch-on time to the start of the compressor start can be set longer, and the increase in the engine speed within this time will be high, and the engine speed at the start of the compressor will be high. The decrease in the rotation speed is suppressed. On the other hand, when the outside air temperature is low, the working gas pressure of the compressor is low, and the load of the compressor is small, the delay time can be set short, so that the increase in the engine speed during this time is low and the compressor It also prevents the engine speed from rising excessively when the engine is started. In this way, since the delay time is changed according to the load of the compressor, it is possible to reduce the fluctuation of the engine rotation when the air conditioner is operated. As a result, it is possible to prevent the engine speed from rising or falling excessively, and to prevent the vehicle from running out and the engine stall.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a control system of an air conditioner.

FIG. 2 is a time chart showing the operation of each part under control.

[Explanation of symbols]

 5 Compressor 7 Electromagnetic Clutch 8 Pressure Pickup 21 Load Detection Means 22 Delay Means 23 Switch State Detection Means 24 Idle Up Control Means 25 Actuation Switches

Claims (1)

[Scope of utility model registration request] 1. An air conditioner control device in which a delay time is provided between a time when an air conditioner operation switch is turned on and a time when a compressor of an air conditioner driven by an engine driving force is started. The air conditioner control device is provided with a load detecting means for detecting the load, and a delay means for changing the delay time according to the load of the compressor detected by the load detecting means.