JPH0717241A - Revolution controller for engine accessory - Google Patents

Abstract

PURPOSE:To get vehicle acoustic vibration performance without a feeling of physical disorder for a crew and further, secure coolness by making up for the shortage of the flow rate of a refrigerant at regulation control of tolerable revolution of a compressor, in a revolution controller for an engine accessory where the revolution control of a compressor and the flow rate control of a flower fan. CONSTITUTION:This controller is provided with a compressor revolution control means i, which performs the revolution control of an air compressor to regulate the revolution of an air compressor to a tolerable revolution set value, setting the tolerable revolution of the air compressor from the air quantity of a blower fan and the revolution of an engine, and a blower fan air quantity control means j, which increases the quantity of air of the blower at regulative control of the tolerable revolution of an air compressor c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation speed control device for an engine accessory driven by an engine mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, as an air-conditioning engine accessory system, for example, a system described in JP-A-4-362413 is known.

According to this conventional source, when a target temperature is set by a balance control dial, a target air volume is determined according to a signal from each sensor or the like, and a blower fan air volume (blower fan motor rotation speed) is set so as to attain this target flow rate. ) Is controlled steplessly.

As the compressor control, ON / OFF control of the compressor is performed according to the selected switch (air conditioner, economy, defrost) and the outside air temperature.

[0005]

However, in the above-mentioned conventional engine accessory system, since the air conditioner compressor is directly driven by the engine, an excessive refrigerant flow rate is produced at times other than during maximum cooling. As a result, the cooling capacity becomes excessive, and as a result, extra power required for the compressor is required, which is disadvantageous in terms of power and fuel consumption. In addition, the air conditioner compressor is frequently turned on,
The OFF control is performed by the magnet clutch, but the operating noise when the magnet clutch is ON impedes the quietness of the vehicle interior.

[0006] Therefore, as a plan to solve such a problem, there is a plan to use an air conditioner compressor as a compressor that can be driven at a free rotation speed regardless of engine rotation by a variable rotation speed motor.

In this case, the compressor rotation speed that determines the refrigerant flow rate is variably controlled so that the suction temperature sensor detection value in the refrigeration cycle (post-evaporator sensor temperature) becomes a constant value. .

However, if the compressor rotation speed control and the blower fan air flow rate control are controlled independently of each other, there arises a problem that the noise caused by the rotation of the compressor makes the passenger feel uncomfortable.

That is, in the transition section from the cool-down (the state of operating with the maximum refrigerant flow rate and the maximum air volume) to the steady state (the state of operating with the minimum refrigerant flow rate and the minimum air volume), the compressor rotation speed and the The blower fan air volume changes independently from the maximum value to the minimum value. Normally, the rotational speed of the compressor and the air volume of the blower fan have a very large effect on the noise performance in the passenger compartment.In particular, the rotational speed of the compressor is variably controlled regardless of the engine rotational speed, so it is given to passengers. The impact is great.

The present invention has been made in view of the above problems. A first object of the present invention is to provide a rotation speed control device for an engine auxiliary machine in which both compressor rotation speed control and blower fan air volume control are performed. The purpose is to obtain vehicle sound and vibration performance that does not make the passenger feel uncomfortable.

In addition to the first object, the second object is to make up for the feeling of coolness by compensating for the shortage of the refrigerant flow rate during the control of the allowable rotation speed of the compressor.

[0012]

In order to achieve the above first object, the engine speed control device for an engine accessory according to the first aspect of the present invention comprises:
A means for controlling the air compressor speed by setting the allowable speed of the air conditioner compressor from the blower fan air volume and the engine speed, and regulating the air conditioner compressor speed to the allowable speed setting value.

That is, as shown in the claim correspondence diagram of FIG. 1, an air conditioner compressor c capable of being driven by a variable speed motor a at a free rotation speed regardless of the rotation of an engine b and an air control control In an engine accessory system having a blower fan d whose air volume is controlled, an engine rotational speed detection means e for detecting the rotational speed of the engine b, and a blower fan air volume detection means f for detecting the air volume of the blower fan d. , A compressor speed target value calculating means g for calculating a target speed value of the air conditioner compressor c based on necessary information, and an allowance of the air conditioner compressor c for suppressing the vehicle sound vibration level to a permissible level or less by the blower fan air volume and the engine speed. The compressor allowable rotation speed setting means h for setting the rotation speed and the air conditioner compressor If the rotation speed target value is allowable rotational speed setting value or more, characterized in that it and a compressor rotational speed controller i to define the air-conditioner compressor rotational speed target value in the allowable rotational speed setting value.

In order to achieve the above-mentioned second object, in the engine auxiliary machine rotation speed control device of the second invention, in the engine auxiliary machine rotation speed control device according to claim 1, the air conditioner is controlled by the compressor rotation speed control means i. It is characterized in that a blower fan air volume control means j is provided for controlling the blower fan air volume to be increased at the same time when the control for regulating the compressor rotation speed to the allowable rotation speed setting value is being performed.

[0015]

The operation of the first invention will be described.

When the operation of the air conditioner is started by turning on the air conditioner switch or the like, in the compressor allowable rotation speed setting means h, the vehicle sound is generated by the blower fan air quantity from the blower fan air quantity detecting means f and the engine speed from the engine rotation speed detecting means e. The permissible rotation speed of the air conditioner compressor c is set so that the vibration level is below the permissible level.

On the other hand, the compressor speed target value calculating means g calculates the target speed value of the air conditioner compressor c based on the necessary information. As the compressor rotation speed target value that determines the refrigerant flow rate, for example, the target value is calculated so that the after-evaporator sensor temperature in the refrigeration cycle becomes a constant value.

In the compressor rotation speed control means i, when the air conditioner compressor rotation speed target value is less than the allowable rotation speed set value, the rotation speed of the air conditioner compressor c is obtained so as to obtain the compressor compressor rotation speed target value. Is controlled and the air conditioner compressor rotation speed target value is equal to or higher than the allowable rotation speed setting value, the rotation speed of the air conditioner compressor c is controlled by defining the air conditioning compressor rotation speed target value as the allowable rotation speed setting value.

Therefore, by controlling the rotation speed of the air conditioner compressor c to the allowable rotation speed set by the blower fan air volume and the engine rotation speed,
The blower fan noise and the compressor noise are linked with each other, and the engine noise and the compressor noise are linked with each other, so that the vehicle sound and vibration performance is not uncomfortable for the occupant.

The operation of the second invention will be described.

When the compressor rotation speed control means i is performing control to regulate the air conditioner compressor rotation speed to the allowable rotation speed set value, the blower fan air volume control means j
At the same time, control is performed to increase the blower fan air flow rate.

Therefore, when controlling the air conditioner compressor rotation speed to the allowable rotation speed setting value, the flow rate of the refrigerant discharged from the air conditioner compressor c will be slightly insufficient due to noise emphasis, but this will decrease the cooling capacity of the passenger. The decrease in coolness is compensated by increasing the blower fan air flow.

[0023]

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

First, the structure will be described.

FIG. 2 is a diagram showing an engine accessory system of an automobile to which the engine speed control device for the engine accessory of the embodiment of the present invention is applied.

In FIG. 2, 1 is an engine, 2 is a positive displacement hydraulic pump, 3 is a tank, 4 is a pump suction passage, 5 is a proportional solenoid variable throttle, 6 is a pump discharge passage, 7 is a hydraulic motor (variable rotation speed). (Corresponding to motor a), 8 is a motor return path,
9 is an air conditioner compressor, 10 is a blower motor, 11
Is a blower fan, 12 is an auxiliary system controller, 1
3 is an air conditioner switch, 14 is a mode switch, 15 is a balance control dial, 16 is an inside air sensor, 17
Is an outside air sensor, 18 is a solar radiation sensor, 19 is a suction temperature sensor, 20 is an engine speed sensor (corresponding to engine speed detecting means e), and 21 is a compressor speed sensor.

The hydraulic motor 7 is a motor driven by oil discharged from the positive displacement hydraulic pump 2 operated by the engine 1. The rotation speed of the hydraulic motor 7 is proportional to the proportional solenoid variable throttle 5 provided in the pump suction passage 4. By providing a variable displacement pump function for varying the amount of discharged oil by controlling the throttle amount of No. 1, it is possible to drive the engine 1 at any rotational speed regardless of the rotation. That is, the rotation speed control of the air conditioner compressor 9 rotated by the hydraulic motor 7 is
This is performed by feeding back a compressor rotation speed sensor signal from the compressor rotation speed sensor 21 to control the throttle amount of the proportional solenoid variable throttle 5.

In the blower motor 10, when the target air volume is determined based on the input information, the motor rotation (= fan air volume) is controlled steplessly by changing the base current to the fan control amplifier. Fan air volume control is performed. Therefore, the blower fan air volume is detected by the magnitude of the base current to the fan control amplifier (corresponding to the blower fan air volume detection means f).

The air conditioner switch 13 is a switch operated when an air conditioner is required.

According to the required cooling capacity, the mode switch 14 can select, for example, a standard mode in which a normal cooling capacity is obtained or an economy mode in which the cooling capacity is suppressed.

The balance control dial 15 is
This is a temperature setter for the passenger to set a desired passenger compartment temperature.

The inside air sensor 16, the outside air sensor 17, and the solar radiation sensor 18 measure the inside air temperature, the outside air temperature, and the amount of solar radiation, respectively.

The suction temperature sensor 19 detects the post-evaporator sensor temperature used for calculating the air conditioner compressor rotation speed target value NCO.

Next, the operation will be described.

[Compressor Rotation Speed and Blower Air Volume Control Operation] FIG. 3 is a flow chart showing the flow of compressor rotational speed and blower air volume control operation processing performed by the auxiliary system controller 12, and each step will be described below.

After starting the operation of the engine 1 in step 30,
The control is started at the same time when the air conditioner switch 13 is turned on.

In step 31, the initial value of the compressor speed NC of the air conditioner compressor 9 is set to NC = K.

In step 32, the air conditioner switch 13
Is determined to be OFF, and the control is ended when the air conditioner switch 13 is OFF.

At step 33, the set temperature TSET and the inside air sensor 1 are set by the balance control dial 15.
6, inside air temperature T from outside air sensor 17, solar radiation sensor 18
The target blowing air temperature TAO is calculated by the following first equation using R, the outside air temperature TAM, and the solar radiation amount TS.

TAO = A.TSET-B.TR-D.TAM-E.TS + F (1) Here, A to F are coefficients.

At step 34, the switch signal from the mode switch 14 confirms whether the standard mode or the economy mode is selected.

At step 35, the target blown air temperature T
The blower airflow target value IFANO is calculated based on the AO, the selection mode, and the blower airflow map shown in FIG.
The compressor rotation speed target value NCO is calculated (corresponding to the compressor rotation speed target value calculation means g) on the basis of the target blowing air temperature TAO, the selection mode, and the compressor rotation speed target value calculation method table shown in FIG.

Here, the blower air amount target value IFANO is
As shown in FIG. 4, the blower air volume is set to HI (maximum value) during the cooldown of the standard mode, the target blown air temperature TAO is set to the intermediate temperature range, and the blower air volume is set to LO (minimum value).

The compressor speed target value NCO is shown in FIG.
As described in, the target blowing air temperature TAO is set to the maximum number of revolutions NCMAX1 and NCMAX2 in the low temperature range, and when the target blowing air temperature TAO is in the intermediate temperature range to the high temperature range, the post-evaporator sensor temperature TOUT is T1 (when the standard mode is selected. ) Or T2 (T2>T1; when economy mode is selected) is set.

In step 36, the allowable compressor rotational speed NCMAX is calculated by the following second equation using the current blower fan air volume IFAN and the engine rotational speed NENG (corresponding to the allowable compressor rotational speed setting means h).

NCMAX = (AB-NENG) -IF
AN + C ・ NENG Compressor allowable speed NCM calculated by this formula
The characteristic diagram of AX is as shown in the characteristic diagram of FIG. 6, and the engine speed NENG (Neng1>Neng2> Neng3
The higher the> Neng4), the larger the permissible rotational speed, and the larger the blower fan air volume IFAN, the larger the permissible rotational speed. However, compressor allowable speed NCM
AX has an upper limit value.

At step 37, it is judged if the compressor rotation speed target value NCO calculated at step 35 is equal to or more than the compressor allowable rotation speed NCMAX calculated at step 36.

At step 38, the blower fan air flow rate IF
It is determined whether AN is less than or equal to the blower air flow target value IFANO.

At step 39, the NCO at step 37
<NCMAX, that is, target compressor rotation speed value NCO
Does not reach the compressor permissible rotation speed NCMAX, the compressor rotation speed NC is set to the compressor rotation speed target value NCO, the compressor rotation speed is controlled to obtain this compressor rotation speed NC, and the blower fan air volume IFAN is set to the blower air volume. Target value IFANO
And the blower motor rotation speed control for obtaining the blower fan air volume IFAN is performed.

At step 40, NCO at step 37
≧ NCMAX and IFAN> IF in step 38
ANO, that is, the compressor rotation speed target value NCO is equal to or higher than the compressor allowable rotation speed NCMAX, and the blower fan air volume IFAN is the blower air volume target value IFANO.
When it is judged to be larger than the above, the compressor speed N
C is set to the compressor allowable rotation speed NCMAX, the compressor rotation speed control is performed to obtain this compressor rotation speed NC, and the blower fan air volume IFAN is set.
Is set to an air volume that is the current blower fan air volume IFAN plus a predetermined air volume ΔI, and the blower motor speed control is performed to obtain this blower fan air volume IFAN.

At step 41, the NCO at step 37
≧ NCMAX and IFAN ≦ IF in step 38
ANO, that is, the compressor rotation speed target value NCO is equal to or higher than the compressor allowable rotation speed NCMAX, and the blower fan air volume IFAN is the blower air volume target value IFANO.
When it is determined that it is below, the compressor speed N
C is set to the compressor allowable rotation speed NCMAX, the compressor rotation speed control is performed to obtain this compressor rotation speed NC, and the blower fan air volume IFAN is set.
Is set to an air volume obtained by adding a predetermined air volume ΔI to the blower air volume target value IFANO, and the blower motor speed control is performed to obtain this blower fan air volume IFAN.

The steps 37 to 41 correspond to the compressor rotation speed control means i and the blower fan air volume control means j.

[During Air Conditioner Operation with NCO <NCMAX] When the air conditioner is operating and the compressor revolution speed target value NCO does not reach the compressor allowable revolution speed NCMAX, step 33 → step 34 → step in the flowchart of FIG. 35 → step 36 → step 3
The flow proceeds from 7 to step 39.

Then, in step 39, the compressor rotation speed control for obtaining the compressor rotation speed target value NCO and the blower motor rotation speed control for obtaining the blower air volume target value IFANO are performed.

That is, the compressor revolution speed target value NC
When O does not reach the compressor permissible rotation speed NCMAX, the compressor rotation speed target value NCO and the blower air flow target value IFANO obtained in step 35 are obtained because the air conditioner operating condition has no noise problem. Control and blower motor rotation speed control are performed, and both controls are independent of each other.

[During Air Conditioner Operation with NCO ≧ NCMAX] When the air conditioner is operating and the compressor rotation speed target value NCO is greater than or equal to the compressor allowable rotation speed NCMAX, step 33 → step 34 → step in the flowchart of FIG. 35 → step 36 → step 3
7 → step 38 → step 40 (or step 4
The procedure goes to 1).

In steps 40 and 41, the compressor rotation speed control is performed to define the rotation speed to the compressor allowable rotation speed NCMAX regardless of the magnitude of the compressor rotation speed target value NCO.

Therefore, the compressor rotation speed control is defined by the compressor allowable rotation speed NCMAX by the blower fan air volume IFAN and the engine rotation speed NENG, and the blower fan noise and the compressor noise are linked, and the engine noise and the compressor noise are Therefore, the sound and vibration performance of the vehicle is not uncomfortable for the passengers. For example, in an operating situation where the engine speed is low and the engine noise is low, if the compressor speed is set to a high speed in response to a cooling request, the compressor operating noise will be heard by the occupant, which will be uncomfortable.

In steps 40 and 41,
In both cases, the blower motor rotation speed control is performed to increase the blower fan air volume by a predetermined air volume ΔI.

Therefore, when controlling the rotation speed of the air conditioner compressor 9 to the compressor allowable rotation speed NCMAX, the flow rate of the refrigerant discharged from the air conditioner compressor 9 becomes a little short due to noise emphasis, but this cooling capacity lowers. Blower fan 11 is the feeling of coolness for passengers
It will be compensated by increasing the air volume from.

Next, the effect will be described.

(1) In the engine speed control device for an engine accessory, in which both the compressor speed control and the blower fan air flow rate control are performed, the compressor allowable speed NC based on the blower fan air flow rate IFAN and the engine speed NENG
Since MAX is set and the air compressor rotational speed control is performed to regulate the rotational speed of the air conditioner compressor 9 to the compressor permissible rotational speed NCMAX, the vehicle sound and vibration performance can be obtained without causing the occupant to feel uncomfortable.

(2) Since the control is performed to increase the blower fan air flow rate by the predetermined air flow rate ΔI at the same time when the control for defining the rotation speed of the air conditioner compressor 9 to the compressor allowable rotation speed NCMAX is performed by the compressor rotation speed control. The cooling feeling can be ensured by compensating for the shortage of the refrigerant flow rate during the control of the allowable rotation speed of the air conditioner compressor 9.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

For example, in the embodiment, the example in which the hydraulic motor is applied as the variable rotation motor is shown, but an example in which an electric motor or the like capable of variably controlling the rotation speed is used may be used.

[0066]

As described above, according to the present invention as set forth in claim 1, in the rotation speed control device for the engine accessory in which both the compressor rotation speed control and the blower fan air flow rate control are performed, the blower fan air flow rate is provided. Since the allowable rotation speed of the air conditioner compressor is set from the engine rotation speed and the engine rotation speed, and the air compressor rotation speed control that regulates the air conditioner compressor rotation speed to the allowable rotation speed setting value is performed,
It is possible to obtain an effect that the vehicle sound and vibration performance can be obtained so that the occupant does not feel uncomfortable.

According to a second aspect of the present invention, in the engine speed control device for an engine accessory according to the first aspect, the compressor speed control means regulates the air conditioner compressor speed to an allowable speed set value. In addition to the above effect, since the blower fan air flow rate control means for controlling the blower fan air flow rate at the same time is provided,
The effect that the lack of the refrigerant flow rate can be compensated for and the cool feeling can be secured at the time of the allowable rotation speed regulation control of the compressor is obtained.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram showing a rotation speed control device for an engine accessory according to the present invention.

FIG. 2 is a diagram showing an engine accessory system of an automobile to which a rotation speed control device for an engine accessory of an embodiment is applied.

FIG. 3 is a flowchart showing a flow of compressor rotation speed and blower air volume control operation processing performed by an accessory system controller of the embodiment apparatus.

FIG. 4 is a blower airflow map diagram for obtaining a blower airflow target value.

FIG. 5 is a compressor rotation speed target value calculation method table for calculating a compressor rotation speed target value.

FIG. 6 is a compressor allowable rotation speed characteristic diagram with respect to a blower air volume using the engine rotation speed as a parameter.

[Explanation of symbols]

 a variable speed motor b engine c air conditioner compressor d blower fan e engine speed detection means f blower fan air volume detection means g compressor speed target value calculation means h compressor allowable speed setting means i compressor speed control means j blower fan air volume Control means

Claims (2)

[Claims] 1. An engine accessory system having an air conditioner compressor capable of being driven by a variable speed motor at a free rotation speed regardless of engine rotation, and a blower fan whose air volume is controlled in accordance with air control control. In the engine rotation speed detection means for detecting the rotation speed of the engine, the blower fan air flow rate detection means for detecting the air flow rate of the blower fan, and the compressor rotation speed for calculating the rotation speed target value of the air conditioner compressor based on necessary information. Target value calculation means, compressor permissible rotation speed setting means for setting the permissible rotation speed of the air conditioner compressor to keep the vehicle vibration level below the allowable level by the blower fan air volume and engine speed, and the air conditioner compressor rotation speed target value is the permissible rotation speed If it is above the set value, the air conditioner compressor A rotation speed control device for an engine accessory, comprising: compressor rotation speed control means that regulates a rotation speed target value to an allowable rotation speed setting value. 2. The engine auxiliary machine rotation speed control device according to claim 1, wherein when the compressor rotation speed control means controls the air conditioner compressor rotation speed to be an allowable rotation speed set value, the blower is simultaneously operated. A rotation speed control device for an engine accessory, comprising a blower fan air volume control means for performing control for increasing a fan air volume.