JPH0628324Y2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an air conditioner for an automobile, and more particularly to a load generated when the mode of a mix door, an intake door or a ventilation door is switched. The present invention relates to a fan control device that reduces the rotation speed of a fan motor according to fluctuations.

(Prior Art) Generally, an automobile is provided with an air conditioner that automatically controls the temperature in the passenger compartment to a temperature required by an occupant.

A general type of this air conditioner is shown in FIG. 5, and is configured as follows.

The main body of the air conditioner forming the air flow passage is composed of an intake unit 1, a cooler unit 2 and a heater unit 3, and the respective units are connected in series.

The intake unit 1 is composed of an intake door 6 that adjusts the ratio of the inside air and the outside air of the air taken into the vehicle interior, and a fan 5 that is driven by a fan motor 4. The cooler unit 2 compresses the refrigerant. An evaporator 7 connected to the compressor 9 via a refrigerant pipe 8 is installed. The heater unit 3 includes a heater core 11 for heating the air passing through the cooler unit 2, a mix door 12 for guiding all or part of the air cooled by the cooler unit 2 to the heater core 11, and a mix door 12
A vent outlet 13, a differential outlet 14, and a foot outlet 15 are provided to blow out the air mixed by the above into each part in the vehicle compartment. The vent outlet 13 and the differential outlet 14 are provided.
Doors (not shown) are provided at the respective outlets of the foot outlet 15 and the foot outlet 15.

On the other hand, the intake door 6 is driven by the intake door actuator 16, and the mix door 12 is driven by the mix door actuator 21. The intake door 6 is provided at each of the vent outlet 13, the differential outlet 14 and the foot outlet 15. The open door is driven by the mode door actuator 17. Further, the compressor 9 is provided with a magnet clutch 10 that transmits the power of the engine (not shown) to the compressor 9, and the fan motor 4, the magnet clutch 10, the intake door actuator 16, the mode door actuator 17, and the mix door actuator 21 are Various sensors 19 provided inside and outside the vehicle compartment, a control panel 20 provided inside the vehicle compartment, and a mixed door actuator 2
P which is provided in 1 and detects the opening degree of the mix door 12
Based on signals from the BR 22 and the like, the control device 23 automatically controls the rotation speed of the fan motor 4, the on / off of the magnet clutch 10, the opening degree of the mix door 12, and the like.

Further, FIG. 6 shows a schematic configuration diagram of the periphery of a control device that controls the opening degree of each door and the rotation speed of the fan motor 4 installed in the air conditioner body, and has the following configuration. Has been done.

As shown in the figure, an input interface 29 provided in the control device 23 is provided with a PBR 22 for detecting the opening degree of the mix door 12 and a control panel 20 provided in the vehicle interior. PTC 20a for setting the control temperature of the vehicle and the outside air sensor 2 for detecting the temperature outside the vehicle compartment
4, an inside air sensor 25 that detects the temperature inside the vehicle, an insolation sensor amplifier 27 that amplifies the detection signal of the insolation sensor 26 that detects the amount of insolation, and an intake air temperature sensor 28 that detects the temperature of the air passing through the evaporator 7. Are connected, and the detection signals output from these sensors are input respectively. Then, in the input interface 29, based on the signals sent from the various sensors 19, the mix door opening calculation unit 30 that calculates the operation amount of the mix door actuator 21, and the operation of the intake door actuator 16 and the moded actuator 17. A mode selection unit 31 that calculates the amount and an air volume calculation unit 32 that calculates the rotation speed of the fan motor 4 are connected to each other.

Then, the mix door opening calculation unit 30 controls the opening of the mix door 12 based on the detection signals of the various sensors 19 input via the input interphase 29.

Further, in the mode selection unit 31, the input interface 29
Based on the detection signals of the various sensors 19 input via the and the signals output from the mix door opening degree calculation unit 30,
The intake door actuator 16 and the mode door actuator 17 are operated, and as shown by characteristic lines I and II in FIG. 7, the vent outlet 13, the differential outlet 14 and the foot outlet 15 are set in accordance with the opening of the mix door 12. The doors provided at the respective outlets are driven to set the outlet mode, and the opening degree of the intake door 6 is changed.

Further, in the air volume calculation unit 32, the input interface 29
The fan motor 4 is driven based on the calculated rotation speed of the fan motor 4 based on the detection signals of the various sensors 19 input via the.

(Problems to be solved by the invention) However, in such a conventional control device 23,
The fan motor 4 is adapted to rotate at a rotation speed calculated based only on the signal output from the input interface 29.

Therefore, when the rotation speed of the fan motor 4 is high, the intake door 6, the mix door 12, the vent outlet 13,
When the door provided at each of the differential outlet 14 or the foot outlet 15 is driven, the drive load on the door is increased as compared to when the rotation speed of the fan motor 4 is low. Therefore, the intake door actuator 16, A large driving load is applied to the mode door actuator 17 and the mix door actuator 21.

In order to eliminate such inconvenience, Japanese Patent Publication No. 61-46, 3
Japanese Patent Laid-Open No. 44-44 discloses a technique in which the operation of the fan motor is stopped or coasted to reduce the operating load of the actuator at the rotational position where the intake door or various air distribution doors are greatly affected by the wind pressure.

However, according to this technique, regardless of the rotation speed of the fan motor, the rotation speed of the fan motor is reduced when the intake door or various air distribution doors have a predetermined opening degree, and therefore It has such drawbacks. For example, when the rotation speed of the fan motor is slow and the operating load of the actuator is small, or when the wind pressure (ram pressure) of the air that is naturally introduced along with changes in the running state of the vehicle is low, that is, the vehicle speed is slow. As in the case,
Even if the load on the intake door or various air distribution doors is small and it is not necessary to reduce the speed of the fan motor, the fan motor is stopped or inertially driven uniformly, so the air conditioning feeling in the vehicle interior is deteriorated. There is a risk of inviting.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide an air conditioner for an automobile that efficiently controls intake doors, mix doors, and air distribution doors.

[Constitution of device]

(Means for Solving the Problems) The present invention for achieving the above-mentioned object is to introduce an air into an air flow passage of an air conditioner and to blow the air into a passenger compartment, and an air flow. In an automobile air conditioner including an actuator that drives a door disposed in a road, a load detection unit that detects a load of the actuator and a load of the actuator that is detected by the load detection unit have a predetermined value. When it is above, it is characterized by having an air blowing amount control means for reducing the air blowing amount of the air blowing means.

(Operation) Next, the operation of the present invention will be described based on the block diagram of the main part of the control device according to the present invention shown in FIG.

According to the figure, the air blowing amount of the air blowing unit is calculated based on the signal output from the load detecting unit that detects the loads of the intake door actuator and the mode door actuator, and these air blowing amounts are calculated based on the calculated air blowing amount. Prevent actuator overload.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a schematic configuration diagram of the periphery of the control device according to the present invention, which is configured as follows. As shown in the figure, the PBR 22 for detecting the opening degree of the mix door 12 is provided in the input interface 29 provided in the control device 23, and the PBR 22 provided in the control panel 20 provided in the vehicle interior is provided in the vehicle interior. PTC20 to set control temperature
a, an outside air sensor 24 that detects the temperature outside the vehicle compartment, an inside air sensor 25 that detects the temperature inside the vehicle compartment, a solar radiation sensor amplifier 27 that amplifies the detection signal of the solar radiation sensor 26 that detects the amount of solar radiation, and an evaporator 7. An intake air temperature sensor 28 for detecting the temperature of passing air, and a mode door actuator 1
7 and the intake door actuator 16 are connected to ammeters 33 as load detecting means for detecting the values of currents flowing at the time of turning, respectively, and the detection signals output from these sensors are input respectively. Then, in the input interface 29, the mix door opening calculation unit 30 that calculates the operation amount of the mix door actuator 21 based on the signals sent from the various sensors 19, and the operation of the intake door actuator 16 and the mode door actuator 17. The mode selection unit 31 for calculating the air volume and the air volume calculation unit 32 for the air volume control unit for calculating the rotation speed of the fan motor 4 as the air blowing unit are respectively connected. The mix door opening calculation unit 30 is connected to the mode selection unit 31 and the air volume calculation unit 32, and the mode selection unit 31 is connected to the air volume calculation unit 32.

Then, the mix door opening degree calculation unit 30 controls the opening degree of the mix door 12 based on the detection signals of the various sensors 19 input via the input interface 29.

In the mode selection unit 31, the input interface 2
The intake door actuator 16 and the mode door actuator 17 are actuated based on the detection signals of the various sensors 19 input via 9 and the signals output from the mix door opening degree calculation unit 30, and the characteristic line I, As shown in II, according to the opening of the mix door 12, the doors provided at the vent outlet 13, the differential outlet 14 and the foot outlet 15 are driven to set the outlet mode, The opening degree of the intake door 6 is changed.

Further, in the air volume calculation unit 32, the input interface 2
The fan motor 4 based on the detection signals of the various sensors 19, the signals output from the mix door opening calculation unit 30, and the signals output from the mode selection unit 31 that are input via 9
Calculate the rotation speed of, and based on the calculated rotation speed,
The fan motor 4 is driven.

Then, the control device 23 configured as described above uses the fan motor 4, based on the operation flowchart shown in FIG.
The intake actuator 16, the mode door actuator 17, and the mix door actuator 21 are controlled.

Step 1 A signal from the mix door opening calculation section 30 to activate the mix door actuator 21, and a mode selection section 3
When at least one of the signals for operating the intake door actuator 16 or the mode door actuator 17 from 1 is input to the air volume calculation unit 32 as the air volume control means, the ammeter as the load detection means connected to each actuator is used. Current value flowing to each actuator;
I is input to the air volume calculation unit 32, respectively.

Since the actuator is a DC motor, the current value; I flowing through the actuator increases substantially in proportion to the load when it is overloaded.

Step 2 The air flow rate calculation unit 32 compares the current value; I with the minimum current value; Imin indicating the overload of the actuator. If the current value; I is greater than the minimum current value; Imin, the process proceeds to step 3, and if the current value; I is less than the minimum current value; min, the process proceeds to step 5.

Step 3 The fact that the current value; I is larger than the minimum current value; Imin means that the actuator is overloaded. Therefore, the air flow calculation unit 32 indicates that the current value; I is the minimum current value; I.
While feeding back the current value; I so as not to exceed the value of min, the rotation speed of the fan motor 4 as the blowing means is calculated, and a signal for driving the fan motor 4 is output based on the calculated rotation speed. To do.

Step 4 Next, the air flow rate calculation unit 32 determines that the current value; I and the minimum current value; I
Compare min. And the current value; I is the minimum current value;
When it is smaller than Imin, the process proceeds to step 5, and when the current value; I is larger than the minimum current value; Imin, the process proceeds to step 3.

Step 5 Each actuator has completed its operation, and the air volume calculation unit 32
Performs normal control for calculating the rotation speed of the fan motor 4 based on the signal output from the input interface 29.

As described above, in this embodiment, the fan motor control is performed by increasing / decreasing the value of the current flowing to the actuator. However, as another embodiment, in FIG. 4, instead of the ammeter 33 shown in FIG. A torque sensor (not shown) for detecting torque is connected to the input interface 29, and an operation flowchart is shown when fan motor control is performed by increasing or decreasing the torque signal; T of the actuator.

The difference between this other embodiment and the above-mentioned embodiment is that a torque sensor is used instead of the ammeter 33 as the load detecting means, and a timer (not shown) is provided. In particular, by providing a timer, the actuator is operated and the fan motor 4 is normally controlled after a lapse of a predetermined time. Further, this time is set to be longer than the half cycle time of the actuator.

As described above in detail, in the present embodiment, the rotation of the fan motor is controlled steplessly while feeding back the current value or the torque signal, but whether the rotation of the fan motor is uniformly reduced or stopped. Alternatively, it may be controlled stepwise.

Further, although the present embodiment is configured by the microcomputer, it may be configured by an electronic circuit or the like as long as the same operation as in the present embodiment is performed.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the rotation speed of the fan motor is calculated based on the signal output from the load detection means that detects the load on the intake door actuator and the mode door actuator. Since the fan motor is driven in this manner, the load can be limited so that the actuator is not overloaded, the actuator can be protected, and the durability of the actuator can be improved. Furthermore, since the change in the amount of air blown by the fan is minimized, it is possible to provide an air conditioner that operates stably.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a control device according to the present invention, and FIG. 2 is a schematic configuration diagram around the control device according to the present invention.
3 and 4 are operation flowcharts of the control device according to the present invention, FIG. 5 is a schematic configuration diagram of a general automobile air conditioner, and FIG. 6 is a schematic configuration diagram of a conventional control device peripheral,
FIG. 7 is a diagram for explaining the operation of the mode selection unit of the control device shown in FIG. Fan motor (blowing means) ... 4, intake door ... 6, intake door actuator ... 16, mode door actuator ... 17, air volume calculation unit (air volume control means) ... 32, ammeter (load detection means) ... 33.

Claims (1)

[Scope of utility model registration request] 1. An air blower (4) for introducing air into an air flow passage of an air conditioner to blow the air into a vehicle compartment, and an actuator for driving a door arranged in the air flow passage. And a load detecting means (3) for detecting the load of the actuator,
3) and when the load of the actuator detected by the load detecting means (33) is equal to or more than a predetermined value,
An air conditioner for a vehicle, comprising: an air volume control means (32) for reducing the air flow rate of the air blow means (4).