JPH02241820A - Control device for car air conditioner - Google Patents

Abstract

PURPOSE:To prevent the unnecessary rise of the engine rotating speed by adjusting the engine rotating speed, and adjusting the power generation quantity of an AC generator within the preset range based on the required rotating speed of a compressor and the power generation quantity control signal when performing air conditioning during idling with an electric compressor. CONSTITUTION:The motor 14a of an electric compressor 14 is driven by the excitation from an AC generator 12 driven by an engine 11. In this case, the required rotating speed of the motor 14a is determined by the first control circuit 13 based on the room temperature set by a setter 18 and the room temperature detected by a detector 16. The power generation quantity of the AC generator 12 is controlled by the second control means based on the excitation state of the motor 14a from the first control circuit 13 and the required rotating speed. An actuator 11e is controlled by an idle-up controller 17 which is the third control means based on the engine rotating speed and the throttle opening detected by detectors 11f and 11c respectively, and the inflow quantity of a mixture is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle or dual-use device that uses a so-called electric compressor having a built-in motor, and particularly to a control device for such a vehicle air conditioner.

(Prior art) Generally, in a vehicle air conditioner that uses an electric compressor,
Based on the electricity supplied from the alternator driven by the engine, the motor is driven to compress the refrigerant, thereby air conditioning the room. ing. In this type of vehicle air conditioner,
The rotation speed of the electric compressor is controlled according to the indoor temperature. That is, the drive current applied to the electric compressor is adjusted based on the inspection room temperature and the preset indoor temperature, thereby controlling the rotation speed of the electric compressor.

By the way, a so-called idle-up device is conventionally known that detects the rotational speed of a vehicle engine and controls the rotational speed of an engine in an idling state to a predetermined rotational speed.

In a vehicle equipped with such an idle-up device, when idling, the rotational speed of the alternator is a certain rotational speed depending on the predetermined idle-up amount and engine load, so the amount of power generation decreases significantly, and as a result, the motor It may not be possible to increase the rotation speed to the required rotation speed. In other words, the required refrigeration capacity cannot be obtained.

For this reason, conventionally, the power generation capacity of the generator is increased to increase the amount of power generation. Boo 9-ratio of engine and alternator!
and operate the alternator at a large speed increase ratio to increase the amount of power generated during idling. Increases the engine speed during idling to increase the amount of power generated during idling. Measures are being taken.

(Problem to be solved by the invention) By the way, when the generation capacity of a generator is increased as in the past, the generator itself naturally becomes larger, and as a result,
A large installation space must be secured around the engine. Furthermore, since the weight of the generator itself increases, the parts needed to install the generator are larger.
There is a problem in that its strength must also be increased.

On the other hand, when operating an alternator with a large speed increase ratio,
It is necessary to increase the durability and allowable rotation speed of the generator during high-speed rotation, and furthermore, when the engine speed increases, the amount of power generation must be reduced to a specified level by limiting the field current of the generator. If it is lowered below this level, there is a problem that the efficiency of the generator will be greatly reduced, and as a result, power will be wasted in the engine.

Furthermore, when the engine speed is increased during idling, if the cooling load is small, the engine speed is increased needlessly, resulting in a problem in that fuel efficiency and drivability deteriorate.

An object of the present invention is to provide a control device for a vehicle air conditioner that can obtain the necessary refrigerating capacity during idling without increasing the size of the generator.

Another object of the present invention is to provide a control device for a vehicle air conditioner that does not waste engine power.

(Means for Solving the Problems) According to the present invention, there is provided an electric compressor equipped with an electric motor mounted on a vehicle, and the electric motor is driven by electricity from an alternator driven by the engine of the vehicle. A rotation speed detector for detecting the rotation speed of the engine, and an opening for detecting the opening degree of a throttle that adjusts the amount of air-fuel mixture flowing into the engine. a temperature detector, an actuator for adjusting the inflow amount of the air-fuel mixture, a temperature detector for detecting the indoor temperature of the vehicle, based on a preset set indoor temperature and the detected indoor temperature. The required number of rotations of the electric motor is determined, and the flow Th to the electric motor is determined based on the required number of rotations.
The amount is 21! ! a first control means for controlling the amount of power generated by the alternator based on the energization state of the electric motor from the first control means and the required rotation speed; The engine rotation speed, the opening detection signal, the required rotation speed, and the power generation amount control signal from the second control means are input, and a third control means controls the actuator to adjust the inflow amount of the air-fuel mixture. A vehicle air conditioner characterized by having a control means is obtained.

(Function) In the present invention, a so-called electric compressor with a built-in motor is used in a vehicle air conditioner. It is driven by

When performing indoor air conditioning, the first control means determines the required rotation speed of the electric motor based on a preset indoor temperature and a detected indoor temperature detected by a temperature detector. Then, the amount of electricity supplied to the generator is controlled according to this required rotation speed.

On the other hand, the second control means adjusts the amount of power generated by the alternator in accordance with the required rotation speed and the amount of current supplied to the electric motor.

Further, the third control means calculates the required engine speed based on the detected engine speed, the detected opening signal, the required speed, and the power generation control signal, and controls the actuator according to the calculated engine speed. control the amount of drive. That is, the third control means grasps the power generation state of the generator, and determines whether the rotational speed of the electric compressor is excessive or insufficient based on the required rotational speed. Then, based on this, the power generation capacity of the alternator is determined, and the engine speed is adjusted within a predetermined setting range.

In this way, in the present invention, the actual engine rotation speed is adjusted based on the detected engine rotation speed, the detected opening signal, the required rotation speed, and the power generation amount control signal. This not only makes it possible to obtain the necessary refrigeration capacity during idling without increasing the size of the generator, but also prevents engine power from being wasted.

(Example) Hereinafter, the present invention will be explained by referring to Example "C".

Referring to FIG. 1, an alternator 12 is connected to a vehicle engine 11 via a belt (not shown), and the alternator 12 is connected to a first control circuit 13. 1st
The control circuit 13 includes a first controller (motor drive circuit, not shown) and a power generation amount control circuit (second controller, not shown).
The first 1.18 circuit 13 is connected to the electric compressor 14 and the field wire (not shown) of the alternator 12.

The electric compressor 14 includes a DC brushless morph (hereinafter simply referred to as a motor) 14a, and a scroll type compression section 14b connected to the motor 14a. )15b.

It is connected to a refrigerant circuit 15 including an expansion valve 15c5 and an evaporator 15d. In the vehicle interior, an evaporator outlet air temperature detector 16 is arranged at the outlet of the evaporator 15d, and the evaporator outlet air temperature detector 16 is connected to the first control circuit 13.

On the other hand, a mixing pipe 11a that supplies air-fuel mixture to the engine 11 has a throttle valve llb for adjusting the amount of air-fuel mixture.
Further, a throttle opening sensor llc for detecting the opening of the throttle valve llb is attached. Also, a bypass pipe l is provided in parallel with the mixing pipe 11a.
id is provided, and a variable stroke actuator lie for adjusting the opening degree of the bypass pipe lid is disposed on the bypass pipe lid. Further, an engine rotation speed sensor llf for detecting the rotation speed of the engine 11 is attached to the engine 11.

The first control circuit 13 is connected to a third control circuit (hereinafter referred to as an idle-up controller) 17, and this idle-up controller 17 includes the above-mentioned throttle opening sensor 11C1 variable stroke type actuator 11e.
1 and an engine rotation speed sensor llf are connected.

First control circuit 13 and idle up controller 1
7 is connected to a setting device 18, and from this setting device 18, the set indoor temperature, the engine speed during idling, etc. are set, as will be described later. Furthermore, a neutral position detection sensor 19 for detecting the neutral position of the transmission is provided in the vehicle transmission.
is arranged, and this neutral position detection sensor 19 is connected to the idle up controller 17.

To air condition the inside of the vehicle while the vehicle is running, press the air conditioning switch 2.
0 is turned on. As a result, the first controller detects the indoor temperature setting from the setting device 18 and the indoor temperature sensor (not shown).
The required rotational speed of the electric compressor 15 is determined based on the detected indoor temperature from the sensor and the evaporator outlet temperature from the outlet air temperature detector 16.

Furthermore, the required current value is determined based on the required rotation speed, and the DC drive current is applied to the motor 1 according to this required current value.
Give to 4a. This drives the motor 14a, and compressed refrigerant is discharged from the electric compressor 14 to the refrigerant circuit 15, thereby performing air conditioning.

The second controller then adjusts the field current of the alternating current generator 12 according to this required rotation speed, thereby adjusting the amount of power generation. The alternating current from the alternator 12 is applied to the motor drive circuit. On the other hand, the above required rotation speed and the second
The power generation amount control signal of the controller is given to the idle up controller 17. Furthermore, the detected throttle opening from the throttle opening sensor 11C and the detected engine speed from the engine speed sensor llf are input to the idle up controller 17.

By the way, a plurality of engine speeds in an idling state are set in the idle up controller 17 from the setting device 18. That is, from the setting device 18, a first engine speed setting value (EN2, which corresponds to the maximum allowable engine speed) and a second engine speed setting value (EN2, which is lower than the first engine speed setting value) are input. A third engine speed setting value (EN3, which is an engine speed lower than the second engine speed setting value and corresponds to the lowest allowable engine speed) is set.

Here, referring also to FIG. 2, when the engine is idling, the idle up controller 17 adjusts the detected engine speed (EN) to the first engine speed setting value (EN
If EN≦EN1, it is further checked whether the detected throttle opening (α) is less than or equal to the throttle opening setting value (α0). α≦
If α0, the neutral position detection sensor 19 checks whether the transmission is in the neutral position, and if it is in the neutral position, the power generation amount control state from the power generation amount control circuit is grasped, and the required rotation speed is determined from the required rotation speed. The engine speed increase control is performed when it determines that the power generation state is at the maximum at the current engine speed and that the required speed is greater than the actual speed. Output a signal.

The variable stroke actuator 11e adjusts the opening degree of the bypass pipe lid based on the engine speed increase control signal to increase the engine speed (first idle up control). This increases the amount of power generated by the alternator 12. In other words, the drive current from the motor drive circuit is increased. At this time, the engine speed is controlled with the first engine speed setting value (ENI) as the upper limit. on the other hand,
The actual rotation speed above is the required rotation speed, and
When the amount of power generation is limited by the li amount control circuit, a rotation speed reduction control signal is output. The variable stroke actuator lie adjusts the opening degree of the bypass pipe lid based on the rotation speed reduction control signal to lower the engine rotation speed (first idle up control). This reduces the amount of power generated by the alternator 12. At this time, the engine speed is controlled using the third engine speed setting value (EN, ) as the lower limit. If the transmission is not in the neutral position, idle up controller 1
7 controls the engine speed between the second engine speed setting value (EN2) and the third engine speed setting value (EN3) (second idle up control). In other words,
If the transmission is not in the neutral position, the engine speed is kept low to avoid dangerous situations when starting or decelerating, and in the case of A/T vehicles, the load on the handbrake and torque converter is reduced. It is something. . This engine speed range is the second
This is an engine rotation speed range defined by a third engine rotation speed setting value (EN2) and a third engine rotation speed setting value (EN3).

On the other hand, if the engine speed (EN) exceeds the first engine speed setting value (ENl), that is, EN>E
N, or the throttle opening (α) exceeds the throttle opening setting value (α0), that is, α>α. If so, the idle up controller 17 determines that the vehicle is not in the idling state and stops the idle up control described above. Furthermore, even in the idle-up control state, even if it is determined that there is sufficient capacity of the alternator based on the required rotation speed and the control signal from the power generation control circuit, the third engine rotation speed setting value (EN, ), a variable stroke actuator is used to prevent the engine speed from decreasing.
control ie. This prevents the engine speed from decreasing unnecessarily and prevents deterioration of drivability.

Although the above-described embodiments have been described using a fuel injection engine as an example, the present invention can be similarly applied to a carburetor engine.

When applied to a carbureted engine, as shown in FIG. 3, a throttle valve 11b is connected to the accelerator 21 via a wire cable 21a. Further, a variable stroke actuator], 1e is connected to the throttle valve llb as shown in the figure. Further, the accelerator 21 includes a throttle opening sensor 11.
c is attached. The idle up controller 17 is connected to a throttle opening sensor 11C1, a variable stroke actuator 11e1, and an engine rotation speed sensor lif. The operation of the idle up controller 17 and the like is the same as in the embodiment shown in FIG.

(Effects of the Invention) As explained in (-2), in the present invention, when an electric compressor is used and air conditioning is performed during idling, the Since the engine speed is adjusted within the set range and the amount of power generated by the alternator is adjusted, the engine speed does not increase unnecessarily during idling.In other words, the load on the electric compressor is reduced. The engine will be driven at a rotational speed that produces the amount of power generated according to f.As a result, the capacity of the alternator only needs to be set to a capacity commensurate with normal driving, and the alternator can be made larger. In addition, the necessary refrigerating capacity can be obtained during idling.

Furthermore, drivability can be improved without wasting engine power.

Further, in this embodiment, a scroll type compressor and 17 are used, but any other type is applicable, and it goes without saying that a DC generator may also be used as the generator.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment in which a control device for a vehicle refrigeration system according to the present invention is applied to a fuel injection engine;
FIG. 2 is a flowchart for explaining the operation of the control device shown in FIG. 1, and FIG. 3 is a block diagram showing a part of an embodiment in which the control device for a vehicle refrigeration system according to the present invention is applied to a carburetor engine. It is. 11...engine, 12...alternator, 13...
- First control circuit, 14... electric compressor, 15...
・Refrigerant circuit, 16... Evaporator outlet temperature detector, 17・
... Idle up controller, 18... Setting device,
One...neutral position detection sensor. I Figure 3

Claims (1)

[Claims] 1. It is used in a vehicle air conditioner which has an electric compressor equipped with an electric motor mounted on the vehicle, and the electric motor is driven by electricity from an alternator driven by the engine of the vehicle. a rotation speed detector for detecting the rotation speed; an opening degree detector for detecting the opening degree of a throttle for adjusting the amount of air-fuel mixture flowing into the engine; and an opening degree detector for adjusting the amount of air-fuel mixture flowing into the engine. a temperature detector for detecting the indoor temperature of the vehicle, a required rotation speed of the electric motor based on a preset indoor temperature and the detected indoor temperature, and based on the required rotation speed. a first control means for adjusting the amount of current supplied to the electric motor; and a power generation amount of the alternator is controlled based on the state of conduction of electricity to the electric motor from the first control means and the required rotation speed. A second control means receives the detected engine rotational speed, the opening detection signal, the required rotational speed, and the power generation amount control signal from the second control means, controls the actuator, and controls the air-fuel mixture. A control device for a vehicle air conditioner, comprising: third control means for adjusting an inflow amount of air.