JP3104308B2 - Electric vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003]

Since an electric vehicle runs on a battery as a power source, the distance that can be run on a single charge largely depends on the battery capacity. Therefore, the remaining traveling distance during traveling depends on the remaining battery capacity.
Also, since the same battery is used for the electric compressor for the air conditioner, the output of the air conditioner must be limited according to the remaining capacity of the battery in some way. There was a problem that the car would stop and stop moving before going to the destination. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to prevent a car from stopping and becoming inoperable before going to a destination by operating an air conditioner.

[0004]

In order to solve the above 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 that controls at least the compressor rotation speed 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.
A DC current detection unit that detects a DC current supplied from the battery to the drive device, and reduces the rotation speed of the electric compressor when the current detected by the DC current detection unit exceeds an allowable value. An air conditioner output limiting unit that limits the output of the air conditioner, and a DC voltage allowable value changing unit that changes the allowable value of the DC current according to the remaining capacity of the battery, or a battery voltage detecting unit that detects the battery voltage, 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 detecting unit becomes smaller than an allowable value; and sets the allowable value of the battery voltage to the remaining capacity of the battery. Provide a battery voltage allowable value changing unit that changes according to, or a DC current detecting unit, a battery voltage detecting unit, A power consumption calculation detection unit that calculates and detects power consumption from the voltage detected by the battery voltage detection unit and the current detected by the DC current detection unit; and the power consumption detected by the power consumption calculation detection unit has an allowable value. An air conditioner output limiting unit that reduces the number of rotations of the electric compressor to limit the output of the air conditioner when it exceeds, 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. It is.

[0005]

According to the present invention, a DC current,
Alternatively, the output of the air conditioner is detected based on the battery voltage or the DC current and the battery voltage.When the output exceeds the allowable value, the rotation speed of the electric compressor is reduced to limit the output of the air conditioner, and the allowable value is set according to the remaining battery capacity. So that the car does not stop and get stuck before going to the destination.

[0006]

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

FIG. 1 shows an electric automatic transmission according to an embodiment of the present invention.
It is a block diagram of a structure of a vehicle air conditioner . As shown in the figure, the battery 1 is a power source for the traveling motor 2 and also a power source for the electric compressor 3 for air conditioning.
The control device 4 controls various air conditioning actuators 6 based on signals from various sensors 5 such as an in-vehicle temperature sensor and an out-of-vehicle temperature sensor, and outputs a control signal of the electric compressor 3 to a drive device 7 to output the electric compressor 3. 3 is driving. Further, the remaining battery level detecting means 8 detects the remaining battery level by monitoring, for example, the current, voltage, power, etc., output from the battery.
Output the signal.

FIG. 2 shows the relationship between the mileage of an electric vehicle and the remaining battery capacity.
When the air conditioner is not operated, it is possible to travel 200 km. Here, when the heat load is large and the air conditioner is operated at 3.0 KW with no output limitation, the traveling distance is more than 140 km ,
For example, if the distance to the destination is longer, the vehicle will stop halfway. So, for example,
Until the remaining battery capacity is 20 kWh (point A), the air conditioner output is set to 3.0 kW, and the remaining battery capacity is 10 kWh.
Until (point B), the air conditioner output is set to 1.5 kW, and if the remaining battery capacity becomes less than 10 kWh, the air conditioner output is set to 0.
Then, it is possible to reach the destination as shown in FIG. The destination shown in FIG. 2 is a 160 km
It is assumed that there is a point.

The 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 power consumption allowable value changing unit 9
The allowable value is set to 3 kwh (step 101). If the remaining battery level is less than 20 kWh and 10 kWh or more, the allowable value is set to 1.5 kWh (step 102). ( Step 102 ' ). And the DC current detector 1
0, the DC current detected by the battery voltage detector 11 and the battery voltage are input (steps 103 and 10).
4), the power consumption is calculated by the power consumption calculation detection unit 12 (step 105). Next, the power consumption is compared with the permissible value (step 106). If the power consumption is larger than the permissible value, the air conditioner output limiter 13 reduces the compressor rotation speed until the power consumption becomes smaller than the permissible value (step 107). ).

[0010]

As described above, the air conditioner for an electric vehicle according to the present invention has an electric compressor having a built-in motor driven by an electric input, and a control for controlling at least the number of rotations of the compressor according to the environmental conditions inside and outside the vehicle. Equipment and
A driving device that drives the electric compressor according to a control signal from the control device, a DC current detection unit that detects a DC current supplied from a battery to the driving device, and a DC current detection unit that detects the DC current. An air conditioner output limiting unit that limits the output of the air conditioner by reducing the number of revolutions of the electric compressor when the current exceeds the allowable value, and a DC current allowable value change that changes the allowable value of the DC current according to the remaining capacity of the battery. A battery voltage detector for detecting the battery voltage, and limiting the output of the air conditioner by lowering the rotation speed of the electric compressor when the voltage detected by the battery voltage detector becomes smaller than an allowable value. An air conditioner output limiter, and a battery voltage enabler for changing the allowable value of the battery voltage according to the remaining capacity of the battery. A value change unit, or a DC current detection unit, a battery voltage detection unit, and power consumption for calculating and detecting power consumption from the voltage detected by the battery voltage detection unit and the current detected by the DC current detection unit A calculation detection unit, an air conditioner output restriction unit that limits the output of the air conditioner by reducing the rotation speed of the electric compressor when the power consumption detected by the power consumption calculation detection unit exceeds an allowable value, Since the power consumption allowable value changing unit that changes the value in accordance with the remaining capacity of the battery is provided, by operating the air conditioner, it is possible to prevent the vehicle from stopping and becoming immobile before reaching the destination .

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram showing a relationship between a remaining battery capacity and a traveling distance.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Motor for running 3 Electric compressor 4 Control device 5 Sensor 6 Actuator 7 Drive device 8 Battery remaining amount detecting means 9 Power consumption allowable value changing unit 10 DC current detecting unit 11 Battery voltage detecting unit 12 Power consumption calculating detecting unit 13 Air conditioner Output limiter

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60H 1/32 B60H 1/22

Claims (3)

(57) [Claims] 1. An electric vehicle comprising a traveling motor, a battery for supplying power to the traveling motor, and a remaining battery level detecting means for detecting a remaining capacity of the battery, wherein the electric vehicle is driven by an electric input. comprising an electric compressor, and a control device for controlling the rotational speed of at least the electric compressor according to the vehicle interior outside of the environmental conditions, and a driving device for driving the electric compressor in accordance with a control signal from the control unit with a built-in that the motor and a DC current detector for detecting a DC current from said <br/> battery is supplied to the drive unit, the DC current detected by the detection unit current of the electric compressor when exceeding the allowable value An air conditioner output limiter for reducing the number of revolutions to limit the output of the air conditioner; In the detected DC current allowable value changing unit and the electric motor-vehicle air-conditioning system provided with the change according to the remaining capacity of the battery. 2. An electric vehicle comprising a traveling motor, a battery for supplying electric power to the traveling motor, and a battery remaining amount detecting means for detecting a remaining capacity of the battery, is driven by an electric input. comprising an electric compressor, and a control device for controlling the rotational speed of at least the electric compressor according to the vehicle interior outside of the environmental conditions, and a driving device for driving the electric compressor in accordance with a control signal from the control unit with a built-in that the motor a battery voltage detection unit that detects a voltage of the <br/> battery,
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 detecting unit becomes smaller than an allowable value; An air conditioner for an electric vehicle, comprising: a battery voltage allowable value changing unit that changes according to a remaining capacity of a battery detected by an amount detecting unit. 3. An electric vehicle comprising a traveling motor, a battery for supplying power to the traveling motor, and a battery remaining amount detecting means for detecting a remaining capacity of the battery, wherein the electric vehicle is driven by an electric input. comprising an electric compressor, and a control device for controlling the rotational speed of at least the electric compressor according to the vehicle interior outside of the environmental conditions, and a driving device for driving the electric compressor in accordance with a control signal from the control unit with a built-in that the motor a battery voltage detection unit that detects a voltage of the <br/> battery,
A DC current detection unit that detects a DC current supplied from the battery to the driving device; and calculates and detects power consumption from a voltage detected by the battery voltage detection unit and a current detected by the DC current detection unit. A power consumption calculation detecting unit, an air conditioner output limiting unit configured to reduce a rotation speed of the electric compressor to limit an output of the air conditioner when the power consumption detected by the power consumption calculation detecting unit exceeds an allowable value; An air conditioner for an electric vehicle, comprising: a power consumption allowable value changing unit that changes an allowable value of power according to a remaining capacity of a battery detected by the battery remaining amount detecting unit.