JP2002079825A - Vehicular air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular air conditioner which prevents degradation of travelling performance and fuel consumption without impairing air conditioning performance. SOLUTION: The vehicular air conditioner forming one potion of a refrigerating cycle and provided with a compressor 2 capable of being driven by an engine 6 and a motor 5, comprises cooling load detecting means 12 for detecting a cooling load of the air-conditioner; engine operational state detecting means 13 for detecting an operational state of the engine 6; and motor control means 10 for outputting a signal to the motor 5 so that the compressor 2 is driven by both of the engine 6 and the motor 5, when the cooling load is judged to be larger than a given value by the cooling load detecting means 12 or when the engine 6 is judged by the engine operational state detecting means 13 to require acceleration not less than a given value.

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 provided with a hybrid compressor having a drive system using a driving engine and an electric motor, and more particularly to drive control of the hybrid compressor.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of environmental protection, research and production of a hybrid vehicle that switches between a gasoline engine and an electric motor in accordance with driving conditions and an idle stop vehicle that stops the engine when stopped at a traffic light or the like. However, many air conditioners of hybrid vehicles and idle stop vehicles are equipped with an electric motor for driving the compressor so that the compressor can be driven even when the engine is stopped. However, this motor is usually mounted only for driving the compressor when the engine is stopped, and the compressor is mainly driven by the engine during traveling.

[0003] Further, there is disclosed a technique for preventing the deterioration of the running performance by disconnecting the compressor and the engine when the vehicle is accelerating so that the engine output can be used for accelerating the vehicle (for example, see Japanese Patent Application Laid-Open No. H11-157556). : JP-A-59-13
No. 0725).

[0004]

However, as described above, when the compressor is always driven by the engine during traveling, the load on the engine is large when the vehicle is accelerated or when the cooling load of the air conditioner is high. As a result, the driving performance and the fuel efficiency are deteriorated. Also, JP-A-59-13
In the method of disconnecting the compressor from the engine during acceleration as in the invention disclosed in Japanese Patent No. 0725, there is a problem that the compressor is intermittently driven, the air-conditioning performance is deteriorated, and the comfort in the vehicle compartment is impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle air conditioner that prevents deterioration of running performance and fuel efficiency and does not impair air conditioning performance.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a vehicle air conditioner which constitutes a part of a refrigeration cycle and includes a traveling engine and a compressor which can be driven by an electric motor. A cooling load detecting means for detecting a cooling load of the air conditioner, an engine operating state detecting means for detecting an operating state of the engine, and a case where the cooling load detecting means determines that the cooling load is larger than a predetermined value, or If the engine operation status detecting means determines that an acceleration request equal to or more than a predetermined value has been made to the engine, a signal is output to the motor so that the compressor is driven by both the engine and the motor. And a motor control means (claim 1).

[0007] According to this, the compressor is driven by both the engine and the motor when the vehicle is accelerating or the cooling load is high. With the assistance of the driving force of the motor, the load on the engine can be reduced, so that the deterioration of the running performance and the fuel efficiency can be prevented, and the compressor continues to be driven, so that the air conditioning performance can be maintained at a high level. . Further, as data for determining the cooling load, the high pressure of the refrigeration cycle (the pressure in the region from the compressor discharge port to the expansion valve inlet), the outside air temperature, the amount of solar radiation, the vehicle interior temperature, and the like can be considered.

Further, the motor control means calculates a target rotation speed when driving the motor based on detection signals from the cooling load detection means and the engine operation status detection means. The motor rotation speed calculation means may set the rotation speed of the motor to be lower than the rotation speed of the engine (claim 2).

[0009] According to this, an electric quantity such that the rotation speed is lower than that of the engine is input to the motor. If the rotation speed of the motor is higher than the rotation speed of the engine, the load on the motor becomes large, and an excessive amount of current flows into the motor, resulting in damage to the motor. Can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a vehicle air conditioner according to the present invention. The vehicle air conditioner includes a hybrid compressor 1, a traveling engine 6, a motor control means 10, a cooling system. A load detecting unit 12 and an engine operating state detecting unit 13 are provided.

The hybrid type compressor 1 forms a part of a refrigeration cycle (not shown) and includes a compressor section 2 for compressing a refrigerant circulating through the refrigeration cycle, and a pulley and a shaft. A transmission means 3 for transmitting to the section 2; a magnet clutch 4 controlled by predetermined control means for connecting and disconnecting the transmission means 3; and a vehicle-mounted battery (not shown) connected to the compressor section 2 via a shaft or the like. ) And is controlled by a control signal from a motor control means 10 described later. As a result, the compressor unit 2 includes the engine 6 and the motor 5
It can be driven by the two systems of driving methods.

The motor control means 10 includes a microcomputer having an I / O port, a CPU, a memory, etc.
An A / D converter which converts each input signal, and outputs a control signal to the motor 5 based on input signals from a cooling load detecting means 12, an engine operating state detecting means 13, and the like, which will be described later. It is. The motor control means 10 includes a motor rotation speed calculation means for calculating a rotation speed of the motor 5 when driving the motor 5 based on signals from the cooling load detection means 12 and the engine operation status detection means 13. 11 are included.

The cooling load detecting means 12 detects data such as the high pressure of the refrigeration cycle (the pressure in the region from the compressor discharge port to the expansion valve inlet) detected by various sensors and the like, the outside air temperature, the amount of solar radiation, the vehicle interior temperature, and the like. The degree of the cooling load applied to the air conditioner is determined based on the above, and necessary data is output to the motor rotation speed calculating means 11. The engine operating condition detecting means 13 determines the operating condition of the engine 6 based on a detection signal from a sensor or the like which is installed in the engine 6 and detects a rotation speed, a rotation torque, an accelerator opening, and the like of the engine. The data is output to the motor rotation speed calculation means 11.

Hereinafter, an example of control by the motor control means 10 will be described with reference to flowcharts shown in FIGS. FIG. 2 shows an example of control performed based on the cooling load. First, it is determined whether or not the engine 6 is driven (step 100), and when it is determined that the engine 6 is driven. Then, according to the signal from the cooling load detecting means 12, the outside air temperature Tamb is higher than 30 ° C., or the high pressure Pd of the refrigeration cycle is 15 kgf /
It is determined whether it is larger than cm ² (step 10
1).

In step 101, the outside air temperature T
If it is determined that amb is higher than 30 ° C. or the high pressure Pd of the refrigeration cycle is higher than 15 kgf / cm ² , the rotation speed Ne of the engine 6 is determined by the signal from the engine operation status detecting means 13. Detect (Step 1
02) Then, the target rotation speed Nm (rpm) of the motor 5 when driving the motor 5 is calculated by the motor rotation speed calculation means 11 from the equation of Nm = Ne-50 (step 103). After that, the remaining battery charge Gbatt becomes 5
It is determined whether it is more than 0% (step 104). If it is determined that the remaining battery charge Gbatt is more than 50%, the motor control means 10 rotates at the calculated rotation speed Nm. An electric quantity is output to the motor 5 in order to perform the process (step 105).

If it is determined in step 100 that the engine 6 is not operating, in step 101, the outside air temperature Tamb is not higher than 30 ° C. and the high pressure Pd of the refrigeration cycle is 15 kgf / cm. ^Two
When it is determined that the remaining battery charge Gbatt is not larger than 50%, or when it is determined in step 104 that the remaining battery charge Gbatt is less than 50%, the process exits the control routine and returns to the main control routine or the like.

In the above control, the data for judging the degree of the cooling load includes the outside air temperature Tamb and the high pressure Pd.
Although these upper limits are set to 30 ° C. and 15 kgf / cm ² , they are not limited to these and should be changed as appropriate. For example, as other data for determining the cooling load, the amount of solar radiation, the temperature in the vehicle compartment, and the like can be considered.

FIG. 3 shows an example of control performed based on a request for acceleration of the vehicle. First, it is determined whether or not the engine 6 is driven (step 200), and the engine 6 is driven. Then, it is determined whether or not the accelerator opening α is larger than 70% based on a signal from the engine operating condition detecting means 13 (step 2).
01).

If it is determined in step 201 that the accelerator opening α is greater than 70%, the rotational speed Ne of the engine 6 is detected based on a signal from the engine operating condition detecting means 13 (step 202). Then, the motor 5 is calculated by the motor rotation speed calculating means 11.
The target rotation speed Nm (rp
m) is calculated from the equation Nm = Ne-50 (step 2).
03). Thereafter, it is determined whether or not the remaining battery charge Gbatt is greater than 50% (step 204).
If it is determined that batt is more than 50%, the motor control means 10 outputs an electric quantity to the motor 5 to rotate at the calculated rotation speed Nm (step 205).

In step 200, when it is determined that the engine 6 is not running, in step 201, it is determined that the accelerator opening α is not larger than 70%, and in step 204, If it is determined that the remaining battery charge Gbatt is less than 50%, the process exits from this control routine and returns to the main control routine or the like.

According to the above control, when the vehicle is subjected to a high load on the engine during acceleration or a high cooling load, the motor is driven and the compressor unit 2 is driven.
Is driven by both the engine 6 and the motor 5. Since the load on the engine 6 can be reduced by the assist of the driving force of the motor 5, deterioration of traveling performance and fuel efficiency can be prevented, and the air conditioning performance can be maintained high.

The motor 5 is supplied with an electric quantity such that the rotation speed is lower than that of the engine 6. If the rotation speed of the motor 5 becomes higher than the rotation speed of the engine 6, the load on the motor 5 becomes large, and a current exceeding an allowable amount flows into the motor 5 to cause the motor 5 to be damaged. Such a problem can be prevented.

[0024]

As described above, according to the present invention, the hybrid compressor can be used for the engine and the motor when the vehicle with a high load on the engine is accelerated or under a high cooling load. Since both are driven and the load on the engine is reduced, it is possible to prevent deterioration in running performance and fuel efficiency, and to maintain high air conditioning performance.

Further, by inputting an electric quantity to the motor such that the rotation speed is lower than that of the engine, the load on the motor can be reduced, so that damage to the motor can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a vehicle air conditioner of the present invention.

FIG. 2 is a flowchart illustrating an example of control performed based on a cooling load in the vehicle air conditioner of the present invention.

FIG. 3 is a flowchart showing an example of control performed based on a vehicle acceleration request in the vehicle air conditioner of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hybrid type compressor 2 Compressor part 3 Transmission means 4 Magnet clutch 5 Motor 6 Engine 10 Motor control means 11 Motor rotation speed calculation means 12 Cooling load detection means 13 Engine operation status detection means

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Claims (2)

[Claims] 1. An air conditioner for a vehicle, comprising a part of a refrigeration cycle and having a compressor driven by an engine for traveling and an electric motor, a cooling load detecting means for detecting a cooling load of the air conditioner, An engine operating condition detecting means for detecting an operating condition of the engine; and a case where the cooling load detecting means determines that the cooling load is larger than a predetermined value, or the engine operating condition detecting means accelerates the engine over a predetermined amount. A motor control unit that outputs a signal to the motor so that the compressor is driven by both the engine and the motor when it is determined that the request is made. . 2. A motor rotation speed calculating means for calculating a target rotation speed when driving the motor based on detection signals from the cooling load detecting means and the engine operating condition detecting means. 2. The vehicle air conditioner according to claim 1, wherein the motor rotation speed calculation unit sets the rotation speed of the motor to be lower than the rotation speed of the engine. 3.