JPH0532121A - Air conditioners for electric vehicles - Google Patents

Abstract

PURPOSE:To prevent an electric automobile from stall before getting to the destination by actuating air-conditioner. CONSTITUTION:For sensing the air-conditioning output, a control device 4 is furnished with a DC current sensing part 10, or a battery voltage sensing part 11, or both of them plus a power consumption calculating/sensing part 12. Further an air-conditioning output limiting part 13 is istalled to restrict the air- conditioning output by sinking the revolving speed of a motor-driven compressor when the sensed air-conditioning output exceeds the allowable value, and also is installed an allowable value altering part 9 to alter the allowable value in accordance with the residual capacity of battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an electric vehicle equipped with an electric compressor.

[0002]

2. Description of the Related Art A conventional air conditioner of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. Hei 2-231221. In the air conditioner disclosed in Japanese Unexamined Patent Publication No. 2-231221, the rotational speed of the electric compressor is reduced so that drivability is not impaired when the vehicle is accelerated.

[0003]

Since the electric vehicle is driven by a battery as a power source, the distance that can be traveled by one charge depends largely on the battery capacity. Therefore, the remaining traveling distance during traveling depends on the remaining battery capacity.
In addition, the electric compressor for an air conditioner uses the same battery as the power source, so if you do not limit the output of the air conditioner according to the remaining capacity of the battery in some way, the remaining capacity of the battery will be reduced by operating the air conditioner. However, there was a problem in that the vehicle was much better than expected, and the car stopped and stopped before reaching the destination. The present invention solves the above problems, and an object of the present invention is to prevent the vehicle from stopping and getting stuck by the time the vehicle reaches its destination by operating the air conditioner.

[0004]

In order to solve the above-mentioned problems, an air conditioner for an electric vehicle according to the present invention comprises an electric compressor having a motor driven by an electric input,
A control device for controlling at least the compressor rotation speed according to environmental conditions inside and outside the vehicle, and a drive device for driving the electric compressor according to a control signal from the control device are provided, and the control device includes a battery to the drive device. A direct current detector for detecting a direct current supplied to the air conditioner, and an air conditioner output for limiting the output of the air conditioner by lowering the rotation speed of the electric compressor when the current detected by the direct current detector exceeds an allowable value. A limiting unit and a DC current allowable value changing unit that changes the DC current allowable value according to the remaining capacity of the battery are provided, or a battery voltage detecting unit that detects a battery voltage, and the battery voltage detecting unit detects the battery voltage. Air conditioner that limits the output of the air conditioner by lowering the rotation speed of the electric compressor when the voltage drops below the allowable value A force limiting unit and a battery voltage allowable value changing unit for changing the allowable value of the battery voltage according to the remaining capacity of the battery, or a direct current detecting unit, a battery voltage detecting unit, and the battery voltage detecting unit. A power consumption calculation detection unit for calculating and detecting power consumption from the detected voltage and the current detected by the DC current detection unit, and an electric motor when the power consumption detected by the power consumption calculation detection unit exceeds an allowable value. An air conditioner output limiting unit that limits the output of the air conditioner by lowering the rotation speed of the compressor, and a power consumption allowable value changing unit that changes the allowable value of the power consumption according to the remaining capacity of the battery are provided.

[0005]

The present invention has a direct current,
Alternatively, the output of the air conditioner is detected from the battery voltage or DC current and battery voltage, and when the allowable value is exceeded, the electric compressor speed is reduced to limit the output of the air conditioner, and the allowable value is adjusted according to the remaining capacity of the battery. Since it has been changed, the car will not stop and get stuck by the time you reach your destination.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner for an electric vehicle according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an electric vehicle Western air conditioner according to an embodiment of the present invention. As shown in the figure, the battery 1 is not only the power source for the traveling motor 2 but also the power source for the electric compressor 3 for air conditioning. Further, the control device 4 controls various air conditioning actuators 6 based on signals from various sensors 5 such as a vehicle interior temperature sensor and a vehicle exterior temperature sensor, and also outputs a control signal of the electric compressor 3 to the drive device 7 to drive the electric compressor. 3 is driving. The battery remaining amount detecting means 8 detects the remaining battery capacity by monitoring the current, voltage, power, etc. output from the battery, for example, and outputs a signal to the control device 4.

FIG. 2 shows the relationship between the mileage of an electric vehicle and the remaining capacity of the battery.
If the air conditioner is not operated, it is possible to drive 200 km. Here, when the heat load is large and the air conditioner is operated at 3.0 kW without output limitation, the traveling distance is about 140 km,
For example, if the distance to the destination is longer than that, the car will stop halfway. So, for example,
Air conditioner output is 3.0kw until battery remaining capacity is 20kwh (point A), battery remaining capacity is 10kwh
Up to (point B), set the air conditioner output to 1.5kw, and if the remaining battery capacity is less than 10kwh, set the air conditioner output to 0
Then, the destination can be reached as shown in FIG.

The above control operation will be described with reference to a control flow chart in the control device 4 shown in FIG. 3. When the remaining battery power is 20 kwh or more, the allowable power consumption value changing unit 9 sets the allowable value to 3 kwh ( In step 101), the allowable value is set to 1.5 kwh when the remaining battery capacity is less than 20 kwh and 10 kwh or more (step 102), and the allowable value is set to 0 kwh when the remaining battery capacity is less than 10 kwh (step 103). And the direct current detection unit 10,
The DC current detected by the battery voltage detector 11 and the battery voltage are input (steps 103 and 104), and the power consumption is calculated by the power consumption calculation detector 12 (step 105). Next, the power consumption is compared with the allowable value (step 106). If the power consumption is larger than the allowable value, the air conditioner output limiting unit 13 reduces the compressor rotation speed until the power consumption becomes smaller than the allowable value (step 107). )
Control.

[0010]

As described above, according to the air conditioner for an electric vehicle of the present invention, an electric compressor having a motor driven by an electric input and a control for controlling at least the compressor rotation speed according to the environmental conditions inside and outside the vehicle. Device,
A controller for driving the electric compressor in accordance with a control signal from the control device, wherein the control device detects a direct current supplied from the battery to the drive device; Air conditioner output limiter that limits the output of the air conditioner by lowering the rotation speed of the electric compressor when the current detected by the detector exceeds the allowable value, and changes the allowable value of the DC current according to the remaining capacity of the battery Is there a DC current allowable value changing unit?
Alternatively, a battery voltage detection unit that detects a battery voltage, and an air conditioner output limiting unit that reduces the rotation speed of the electric compressor to limit the output of the air conditioner when the voltage detected by the battery voltage detection unit becomes smaller than an allowable value. A battery voltage allowable value changing unit for changing the allowable value of the battery voltage according to the remaining capacity of the battery, or a DC current detecting unit, a battery voltage detecting unit, and a voltage detected by the battery voltage detecting unit. And a power consumption calculation detection unit that calculates and calculates power consumption from the current detected by the DC current detection unit, and the rotation speed of the electric compressor when the power consumption detected by the power consumption calculation detection unit exceeds an allowable value. Lower limit to limit the output of the air conditioner and the allowable value of the power consumption according to the remaining capacity of the battery. Since there is provided a power allowance changing unit that changes by actuating the air conditioner can be a car before going to the destination to prevent the jamming stopped.

[Brief description of drawings]

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

FIG. 2 is a characteristic diagram showing the relationship between the remaining capacity of the battery and the mileage.

FIG. 3 is a flowchart showing a control flow in the control device.

[Explanation of symbols]

1 battery 2 Running motor 3 Electric compressor 4 control device 5 sensors 6 actuators 7 Drive 8 Battery level detection means 9 Permissible power consumption change unit 10 DC current detector 11 Battery voltage detector 12 Power consumption calculation detector 13 Air conditioner output limiter

Claims (3)

[Claims] 1. An electric vehicle equipped with a traveling motor, a battery for supplying electric power to the traveling motor, and a battery remaining amount detecting means for detecting the remaining capacity of the battery, which is driven by an electric input. An electric compressor having a built-in motor, a control device that controls at least the rotation speed of the electric compressor according to environmental conditions inside and outside the vehicle, and a drive device that drives the electric compressor according to a control signal from the control device. However, a DC current detection unit that detects a DC current supplied from the battery to the drive unit in the control device, and the electric compressor when the current detected by the DC current detection unit exceeds an allowable value. To limit the output of the air conditioner by lowering the number of revolutions of the Direct current threshold value changing unit and the electric motor-vehicle air-conditioning system provided with the change according to the remaining capacity of the detected battery by remaining amount detecting unit. 2. An electric vehicle equipped with a traveling motor, a battery for supplying electric power to the traveling motor, and a battery remaining amount detecting means for detecting the remaining capacity of the battery, and driven by an electric input. An electric compressor having a built-in motor, a control device that controls at least the rotation speed of the electric compressor according to environmental conditions inside and outside the vehicle, and a drive device that drives the electric compressor according to a control signal from the control device. Then, the control device detects the battery voltage and the battery voltage detection unit, and when the voltage detected by the battery voltage detection unit becomes smaller than an allowable value, the rotation speed of the electric compressor is reduced to output the air conditioner. Air conditioner output limiter that restricts the Electric car air-conditioning apparatus provided with a battery voltage allowable value changing unit that changes depending on the remaining capacity of the detected battery by means. 3. An electric vehicle equipped with a traveling motor, a battery for supplying electric power to the traveling motor, and a battery remaining amount detecting means for detecting the remaining capacity of the battery, and driven by an electric input. An electric compressor having a built-in motor, a control device that controls at least the rotation speed of the electric compressor according to environmental conditions inside and outside the vehicle, and a drive device that drives the electric compressor according to a control signal from the control device. In the control device, a battery voltage detection unit that detects the voltage of the battery, a DC current detection unit that detects a DC current supplied from the battery to the drive unit, and a detection by the battery voltage detection unit. Power consumption calculation detection for calculating and detecting power consumption from the measured voltage and the current detected by the DC current detector An air conditioner output limiting unit that limits the output of the air conditioner by lowering the rotation speed of the electric compressor when the power consumption detected by the power consumption calculation detecting unit exceeds the allowable value, and the allowable value of the power consumption. An air conditioner for an electric vehicle, comprising: an allowable power consumption value changing unit that changes the remaining capacity of the battery detected by the remaining battery amount detecting unit.