JPH07285323A - Control driving device of electric compressor for automobile - Google Patents

Abstract

PURPOSE:To prevent the excess consumption of a battery, shorten the heating rise time at a low temperature, and smooth internal lubrication by exciting and heating a motor not to rotatively drive a compression section when the temperature in a compressor becomes a preset value or below while the electric compressor is stopped. CONSTITUTION:An inverter 5 converts the DC voltage from a battery 1 into the three-phase PWM AC voltage via the action of a switching element group 6 during the normal operation of an air conditioner, and an electric compressor 3 is driven at a variable rotational frequency. When the detected value of a temperature detecting means 7 of the stator winding becomes a prescribed value or below while the electric compressor 3 is stopped, the switching element group 6 is controlled in a pattern different from normal, and the voltage not rotating the electric compressor 3 is applied to a heating means 9 for heating. The temperature in the electric compressor 3 is correctly detected without being affected by the running wind, the excess power consumption of the battery 1 is prevented, the heating rise time is shortened at a low temperature, and the internal lubricating action can be made smooth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control drive device for an electric compressor for air conditioning of an automobile.

[0002]

2. Description of the Related Art A conventional technique of this type will be described with reference to the drawings.

In FIG. 6, the electric compressor 3 is driven by an inverter 5 which converts the DC voltage output from the battery 1 into a pseudo AC voltage. Inverter 5
Has a switching element group 6 and a heating means 9 for outputting a switching signal for driving and controlling the switching element group 6 in a predetermined pattern so that the compression section of the electric compressor 3 is not rotationally driven.

The ambient temperature of the electric compressor 3 detected by the temperature detecting means 7 is input to the heating means 9 as a compressor temperature signal 8.

The drive control means of the electric compressor 3 configured as above will be described when the ambient temperature of the electric compressor 3 is low.

This type of conventional technique is mainly used for room air conditioners, and is disclosed in, for example, Japanese Patent Publication No. 4-2859.

When the temperature detecting means 7 for detecting the ambient temperature of the electric compressor 3 outputs a compressor temperature signal 8 below a predetermined value to the heating means 9, the heating means 9 heats the electric compressor 3, so that the temperature is low. It is possible to shorten the heating start-up time and smoothly perform the lubricating action inside the compressor.

Further, in recent years, an air conditioner in which an electric compressor 3 is mounted on an automobile such as an electric automobile has been developed.

[0009]

However, as in the above-described structure, when the low temperature state is detected and heated at the ambient temperature of the electric compressor 3, the detected temperature is not the actual temperature inside the compressor. Because of the difference, it results in the use of extra heating power.

Further, unlike a room air conditioner, since the automobile itself moves, the ambient temperature of the electric compressor 3 is always affected by the traveling wind while the automobile is traveling, and varies greatly depending on the traveling place and traveling speed. . Therefore, the correct ambient temperature of the electric compressor 3 cannot be obtained, and extra heating power may be applied, or conversely, the heating power may be insufficient.

In the case of an electric vehicle, the power source is only the battery (storage battery) 1, and the battery 1 must drive the electric compressor 3 for air conditioning and the traveling motor 2. Therefore, if extra heating power is used for the electric compressor 3 for air conditioning, the traveling distance, which is the original purpose of the automobile, will be shortened, and in the worst case, the battery 1 will rise and the vehicle will not run. Was there.

The present invention solves the above-mentioned problems by detecting the temperature inside the compressor or the surface of the compressor, and heating the electric compressor 3 with a minimum required electric power when the temperature is low, so that the battery 1 An object of the present invention is to provide a control drive device for an electric compressor for an automobile, which prevents excessive power consumption, shortens the heating start-up time at low temperature, and smoothly lubricates the inside of the compressor.

During charging, the inside of the compressor, the surface of the compressor,
The temperature near the compressor is detected, and when the temperature is low, the electric compressor 3
(EN) A control drive device for an electric compressor for an automobile, which heats an electric compressor, shortens the heating rise time at low temperature, and smoothly lubricates the inside of the compressor without consuming the electric power of the battery 1. Has an aim.

[0014]

In order to solve the above problems, the present invention provides: (1) A temperature detecting means for detecting the internal temperature of the electric compressor is provided inside the electric compressor, and the electric compressor is provided. Is stopped, and when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value, the motor is energized so that the compression section of the electric compressor is not rotationally driven to heat the electric compressor. A heating means is provided.

(2) Temperature detecting means for detecting the surface temperature of the electric compressor is provided on the surface of the electric compressor, and the electric compressor is stopped and the temperature detected by the temperature detecting means is predetermined. A heating unit is provided to heat the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven when the value becomes less than or equal to the value.

(3) charging means for charging the battery,
Inside the electric compressor, temperature detection means for detecting the internal temperature of the electric compressor is provided, and the electric compressor is stopped,
And the battery is being charged by the charging means,
Moreover, when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value, a heating means is provided for heating the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven. It is a thing.

(4) charging means for charging the battery,
On the surface of the electric compressor, a temperature detecting means for detecting the surface temperature of the electric compressor is provided, and the electric compressor is stopped,
And the battery is being charged by the charging means,
Moreover, when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value, a heating means is provided for heating the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven. It is a thing.

(5) charging means for charging the battery,
In the vicinity of the electric compressor, a temperature detecting means for detecting a temperature near the electric compressor is provided, and the electric compressor is stopped,
And the battery is being charged by the charging means,
Moreover, when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value, a heating means is provided for heating the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven. It is a thing.

[0019]

According to the present invention, (1) a temperature detecting means for detecting the internal temperature of the electric compressor is provided inside the electric compressor, the electric compressor is stopped, and the temperature detected by the temperature detecting means is By providing a heating means for heating the electric compressor by energizing the motor so that the compression part of the electric compressor is not rotationally driven when it becomes a predetermined value or less, the electric compressor is not affected by the traveling wind. The internal temperature of the electric compressor can be accurately detected, and the electric compressor can be heated with the minimum necessary electric power.

(2) The surface of the electric compressor is provided with temperature detecting means for detecting the surface temperature of the electric compressor, the electric compressor is stopped, and the temperature detected by the temperature detecting means is below a predetermined value. When the temperature of the electric compressor becomes low, the motor is energized so that the compressor of the electric compressor will not be driven to rotate, and the heating means is installed to heat the electric compressor. It can be detected accurately and the electric compressor can be heated with the minimum required electric power.

(3) charging means for charging the battery,
Inside the electric compressor, temperature detecting means for detecting the internal temperature of the electric compressor is provided, and when the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means for heating the electric compressor, the electric compressor can be heated without consuming the electric power of the battery.

(4) Charging means for charging the battery,
Provided on the surface of the electric compressor is a temperature detecting means for detecting the surface temperature of the electric compressor, the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means for heating the electric compressor, the electric compressor can be heated without consuming the electric power of the battery.

(5) charging means for charging the battery,
Provided in the vicinity of the electric compressor is a temperature detecting means for detecting the temperature in the vicinity of the electric compressor, the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means for heating the electric compressor, the electric compressor can be heated without consuming the electric power of the battery.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control and drive system for an electric compressor for an automobile according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an electric vehicle according to an embodiment of the present invention. A battery 1 is a main battery of an electric vehicle and serves as a driving power source for a vehicle driving motor 2 and an air-conditioning electric compressor 3. Charging means 4
Is for charging the battery 1, and is adapted to be charged by using midnight power when parking at night, for example. During charging, a charging signal 10 is output to the heating means 9 in the inverter 5. At the time of normal air conditioning operation, the inverter 5 outputs the DC voltage from the battery 1,
The switching operation of the switching element group 6 converts the variable voltage into a three-phase PWM AC voltage having a variable frequency and drives the electric compressor 3 at a variable rotation speed. Further, inside the electric compressor 3, there is a temperature detecting means 7 constituted by, for example, a thermistor, a bimetal, a thermocouple thermometer, a pressure thermometer, or the like in order to detect the internal temperature. The temperature of the stator winding 11 is detected and the compressor temperature signal 8
Is output to the heating means 9 in the inverter 5. As for the internal temperature of the electric compressor 3, the same effect can be obtained even if the temperature of the suction port, the discharge port of the compression unit, the lubricating oil, the bearing, etc. is detected.

The heating means 9 receives the charging signal 10 and the compressor temperature signal 8 and, under predetermined conditions, controls the switching element group 6 in a pattern different from that during normal air-conditioning operation to perform electric compression. A voltage is applied so that the motor of the machine 3 does not rotate, electricity is applied, and heating is performed. The energization pattern at this time may be as shown in Japanese Patent Publication No. 4-2859.

FIG. 2 is a control flowchart in the heating means 9 while the electric compressor 3 is stopped. First, signal 10 during charging
If it is charging, it is determined whether it is being charged. If it is not charging, the battery 1 will be discharged, so heating is stopped (steps 101 and 104). Judge (steps 101, 1)
02).

When heating is in progress, it is compared whether the compressor temperature signal 8 has reached T1 (heat retention upper limit temperature). If it has reached, heating is stopped because it is not necessary to heat it anymore (step 103). , 104), and if not reached, heating is continued (steps 103, 105).

If heating is not in progress, it is compared whether the compressor temperature signal 8 is lower than T2 (heat retention lower limit temperature), and if it is lower, heating is required and heating is started (steps 106 and 107). If not, there is no need to heat it (steps 106 and 10
5). By controlling in this way, the electric compressor 3 can be kept warm even when the outside air temperature is low.
When the heating is started, the pressure difference can be made quickly and the blowout temperature can be raised quickly.

FIG. 3 shows the detected compressor surface temperature when the traveling wind hits the compressor after the electric compressor 3 is stopped and the temperature detecting means 7 is arranged on the surface of the electric compressor 3, It is a characteristic view showing the relationship between the actual internal temperature of the compression unit and the heating power.

FIG. 4 shows that after the electric compressor 3 is stopped,
The traveling wind hits the compressor, and the detected motor temperature when the temperature detecting means 7 is arranged on the stator winding 11 of the motor inside the electric compressor 3, the actual internal temperature of the compression section, and the heating It is a characteristic view showing the relationship of electric power.

As is apparent from FIGS. 3 and 4, when the temperature detecting means 7 is arranged on the surface of the electric compressor 3, the detected compressor surface temperature is affected by traveling wind rather than the compressor internal temperature. Therefore, it can be seen that the internal temperature of the compression unit is different from that of the actual compression unit, and therefore extra heating power is consumed for that.

Further, when the detected compressor surface temperature is compared with the compressor vicinity temperature, the vicinity temperature is more affected by the traveling wind than the surface temperature, and therefore, the difference from the actual internal temperature of the compression section is. It is getting bigger.

When the temperature detecting means 7 is arranged on the stator winding 11 of the motor inside the electric compressor 3, there is almost no difference between the detected motor temperature and the actual internal temperature of the compression section. It can be seen that the heating power has been reduced.

Here, in this air conditioner, the heating function (heat pump heating) by the electric compressor 3 is stopped even though the temperature outside the vehicle is low.
Generally, when the outside air temperature becomes extremely low (about -10 ° C. or lower), the heating efficiency of the heat pump heating becomes very poor. Since it is equipped with and is switched to it for heating, there is no problem with the heating function.

Further, in the control drive device for an electric compressor for an automobile according to the present invention, such as when parking at night, since the battery 1 is being charged is included in the necessary conditions for heating, the battery 1 is discharged. However, it is possible to prevent the vehicle from stopping.

FIG. 5 shows the internal structure of the electric compressor 3.

[0038]

As is apparent from the above description, the present invention is as follows: (1) Inside the electric compressor, temperature detecting means for detecting the internal temperature of the electric compressor is provided, and the electric compressor is stopped. When the temperature detected by the temperature detection means falls below a predetermined value, the motor is energized so that the compression part of the electric compressor is not driven to rotate, and heating means for heating the electric compressor is provided, so that the running wind The internal temperature of the electric compressor can be accurately detected without being affected by, and the electric compressor can be heated with the minimum amount of power required, thus preventing excessive power consumption of the battery and starting heating at low temperatures. Save time,
It is possible to provide a control drive device for an electric compressor for an automobile that smoothly lubricates the inside of the compressor.

(2) A temperature detecting means for detecting the surface temperature of the electric compressor is provided on the surface of the electric compressor, the electric compressor is stopped, and the temperature detected by the temperature detecting means is below a predetermined value. When the temperature of the electric compressor becomes low, the motor is energized so that the compressor of the electric compressor will not be driven to rotate, and the heating means is installed to heat the electric compressor. Since it can be detected accurately and the electric compressor can be heated with the minimum amount of power required, it prevents excessive power consumption of the battery, shortens the heating rise time at low temperature, and smoothes the lubricating action inside the compressor. It is possible to provide a control drive device for an electric compressor for an automobile, which is performed as described above.

(3) charging means for charging the battery,
Inside the electric compressor, temperature detecting means for detecting the internal temperature of the electric compressor is provided, and when the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means to heat the electric compressor, the electric compressor can be heated without consuming the electric power of the battery, which shortens the heating start-up time at low temperature and smoothes the lubrication inside the compressor It is possible to provide a control drive device for an electric compressor for an automobile, which is performed as described above.

(4) charging means for charging the battery,
Provided on the surface of the electric compressor is a temperature detecting means for detecting the surface temperature of the electric compressor, the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means to heat the electric compressor, the electric compressor can be heated without consuming the electric power of the battery, which shortens the heating rise time at low temperature and smoothes the lubricating action inside the compressor. It is possible to provide a control drive device for an electric compressor for an automobile, which is performed as described above.

(5) Charging means for charging the battery,
Provided in the vicinity of the electric compressor is a temperature detecting means for detecting the temperature in the vicinity of the electric compressor, the electric compressor is stopped, the battery is being charged by the charging means, and the temperature detected by the temperature detecting means is When it becomes less than a predetermined value, energize the motor so that the compressor of the electric compressor does not rotate,
By providing the heating means to heat the electric compressor, the electric compressor can be heated without consuming the electric power of the battery, which shortens the heating rise time at low temperature and smoothes the lubricating action inside the compressor. It is possible to provide a control drive device for an electric compressor for an automobile, which is performed as described above.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is a control flowchart in the heating means.

FIG. 3 is a characteristic diagram showing the relationship between the compressor surface temperature, the actual internal temperature of the compressor, and the heating power.

FIG. 4 is a characteristic diagram showing a relationship between a motor temperature, an actual internal temperature of a compression unit, and heating power.

FIG. 5 is an internal configuration diagram of the electric compressor

FIG. 6 is a configuration block diagram of a compressor drive device for a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Running motor 3 Electric compressor 4 Charging means 5 Inverter 6 Switching element group 7 Temperature detecting means 8 Compressor temperature signal 9 Heating means 10 Charging signal 11 Stator winding 12 Core 13 Compressing part T1 Thermal insulation upper limit temperature T2 Lower temperature limit

Claims (5)

[Claims] 1. A battery, an electric compressor which has a motor built therein, and which compresses a refrigerant for air conditioning, temperature detecting means for detecting an internal temperature of the electric compressor, and a DC voltage from the battery in the form of positive and negative pulse trains. And an inverter for converting the pseudo-AC voltage to drive the electric compressor, wherein the inverter has the electric compressor stopped and the temperature detected by the temperature detecting means is equal to or lower than a predetermined value. At times, a control drive device for an electric compressor for an automobile is provided with a heating unit that heats the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven. 2. A battery, an electric compressor which has a motor built therein and compresses a refrigerant for air conditioning, a temperature detecting means for detecting a surface temperature of the electric compressor, and a DC voltage from the battery in a positive and negative pulse train form. And an inverter for converting the pseudo-AC voltage to drive the electric compressor, wherein the inverter has the electric compressor stopped and the temperature detected by the temperature detecting means is equal to or lower than a predetermined value. At times, a control drive device for an electric compressor for an automobile is provided with a heating unit that heats the electric compressor by energizing the motor so that the compression section of the electric compressor is not rotationally driven. 3. A battery, a charging means for charging the battery, an electric compressor having a built-in motor for compressing a refrigerant for air conditioning, a temperature detecting means for detecting an internal temperature of the electric compressor, and the battery. The inverter includes an inverter that drives the electric compressor by converting a DC voltage from the DC voltage into a pseudo AC voltage in the form of positive and negative pulse trains, and the inverter has the electric compressor stopped and the battery is charged by the charging unit. Heating means for heating the electric compressor by energizing the motor so that the compression part of the electric compressor is not rotationally driven during charging and when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value. A control drive device for the electric compressor for automobiles provided. 4. A battery, a charging means for charging the battery, an electric compressor having a built-in motor for compressing a refrigerant for air conditioning, a temperature detecting means for detecting a surface temperature of the electric compressor, and the battery. The inverter includes an inverter that drives the electric compressor by converting a DC voltage from the DC voltage into a pseudo AC voltage in the form of positive and negative pulse trains, and the inverter has the electric compressor stopped and the battery is charged by the charging unit. Heating means for heating the electric compressor by energizing the motor so that the compression part of the electric compressor is not rotationally driven during charging and when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value. A control drive device for the electric compressor for automobiles provided. 5. A battery, a charging means for charging the battery, an electric compressor having a motor therein for compressing a refrigerant for air conditioning, a temperature detecting means for detecting a temperature in the vicinity of the electric compressor, and the battery. The inverter includes an inverter that drives the electric compressor by converting a DC voltage from the DC voltage into a pseudo AC voltage in the form of positive and negative pulse trains, and the inverter has the electric compressor stopped and the battery is charged by the charging unit. Heating means for heating the electric compressor by energizing the motor so that the compression part of the electric compressor is not rotationally driven during charging and when the temperature detected by the temperature detecting means becomes equal to or lower than a predetermined value. A control drive device for the electric compressor for automobiles provided.