JPS635922Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner that can heat or cool a vehicle interior more quickly or make the rotation noise of a fan motor quieter than during automatic control.

As a vehicle air conditioner, one shown in FIG. 1 is known. That is, the fan motor 10
The fan 11 is rotated by rotating the evaporator 20 from the air intake port 12.
Air is sent to and this air is cooled. This cooled air is passed through the air mix door 30.
There are two types: those that are discharged into the vehicle interior as they are, and those that are heated by the heater core 21 and then discharged into the vehicle interior. This air mix door 30 is driven by an actuator 31, and this actuator 31 is controlled by a valve 32 that introduces the negative pressure of the engine intake pipe and a valve 33 that opens to the atmosphere. In this way, mixdoor 3
The temperature inside the vehicle is controlled to a desired temperature by adjusting the opening degree of 0.

In addition, as described above, the temperature-controlled air flows from the floor duct 40 to the footwells of the vehicle interior, and then to the vent duct 50.
It is discharged from the defrost duct 60 to the defrost nozzle upwardly into the vehicle interior.

In vent mode, only the vent door 51 opens, in bilevel mode, the floor door 41 and vent door 51 open, in heater mode, the floor door 41 and defrost door 61 open, and in defrost mode, only the defrost duct 61 opens. It's becoming like that.

Note that 42, 52, and 62 are actuators for opening and closing the door, and 43, 53, and 63 are solenoid valves. Further, 22 is a compressor, 34 is an opening sensor for the air mix door 30, and 35 is a slide switch that is linked to the position of the air mix door 30.

FIG. 2 is a block diagram showing air volume control. The set temperature To set by the room temperature setting device 71,
The room temperature Tr detected by the room temperature sensor 72, the outside temperature Ta detected by the outside temperature sensor 73, and the water temperature Tw detected by the engine coolant temperature sensor 74 are sent to the A/D converter 81. It is then digitized. This digital value is stored in the memory of the blower voltage calculation circuit 82.

When the fan switch 90 is set to "auto", the position determiner 91 determines this state, the temperature (To-Tr) is calculated by the blower voltage calculation circuit 82, and the result is Based on this, the motor voltage control circuit 83 generates a voltage that produces the air volume determined by the characteristic curve on the left side of FIG.
outputs.

On the other hand, when the fan switch 90 is set to manual, a signal instructing the air volume Hi, Low, and between them is sent to the blower voltage calculation circuit 92 via the position determiner 91. Then, depending on the voltage determined by the motor voltage control circuit 83, the fan motor 10 rotates according to the characteristic curve shown on the right side of FIG.

In this manner, during automatic control, the air volume with respect to the temperature difference (To-Tr) is as shown in the characteristic curve on the left side of FIG. 3. Here, the maximum air volume Hi is set to be large enough that the sound of the fan motor 10 is not noticeable, and the minimum air volume Low is set to be small enough to control the temperature inside the vehicle. Also, during manual control, for the same reason, the maximum air volume Hi and minimum air volume Low are the same as those during automatic control. As a result, during manual control, there is an effect that the motor noise is not noticeable even when the air volume is set to the maximum, and a predetermined air conditioning is possible even when the air volume is set to the minimum.

However, in some cases, even if the motor noise becomes a little louder when the air volume is at its maximum, the user may still feel the need to increase the heating or cooling. However, this requirement is not met because it is not possible to raise the upper limit of the air volume during both automatic control and manual control. Furthermore, in some cases, even if air conditioning is not sufficiently achieved at the lowest air volume, it may be desirable to reduce the motor noise. However, this requirement is not met because the lower limit of the air volume cannot be lowered either during automatic control or manual control.

Therefore, the present invention aims to heat or cool the vehicle interior more quickly than under automatic control, or to make the rotation noise of the fan motor quieter. The rotation speed can be set faster than the maximum rotation speed of the fan motor during automatic control, and the minimum rotation speed of the fan motor during manual control is set lower than the minimum rotation speed of the fan motor during automatic control. A first calculation method that calculates the rotation speed of a fan motor based on a sensor signal during automatic control of a vehicle air conditioner and outputs it within a preset control range. and a second arithmetic circuit that outputs the rotational speed of the fan motor during manual control, which is set according to the operating position of the fan switch, in a control range wider than the control range of the first arithmetic circuit.
The present invention is characterized in that it is comprised of an arithmetic circuit, and a control circuit that controls the rotational speed of the fan motor based on the outputs of the first and second arithmetic circuits.

With this configuration, during automatic control, the first calculation circuit outputs a signal within a preset control range based on the sensor signal to the control circuit, and the control circuit controls the fan based on this signal. The rotational speed of the motor is controlled, and on the other hand, during manual control, the second arithmetic circuit sends a signal with a wider control range than the first control circuit to the control circuit according to the operating position of the fan switch. The control circuit controls the rotation speed of the fan motor based on this signal.

Therefore, by selecting between automatic control and manual control, the control range of the fan motor rotational speed can be changed, thereby making it possible to solve the above-mentioned problems.

The present invention will be described in detail below based on embodiments shown in the accompanying drawings. FIG. 4 is a block diagram showing one embodiment of the present invention. This embodiment differs from the embodiment shown in FIG. 2 in that the fan switch 93 has a wide range of manual air volume adjustment. That is, the blower voltage calculation circuit 94 controls the average voltage applied to the fan motor 10 even lower than before when the fan switch 93 is Low, and controls the average voltage applied to the fan motor 10 when the fan switch 93 is Hi. The average voltage applied is controlled to be higher than that of the conventional method.

As a result, as shown in Fig. 5, the air volume when the fan switch 93 is set to Hi during manual control is greater than the maximum air volume during manual control, and when the fan switch 93 is set to Hi during manual control.
The air volume when set to Low is lower than the minimum air volume during automatic control. Therefore, when the fan switch 93 is set to Hi during manual control,
Although the sound of the fan motor 10 becomes louder, heating or cooling becomes stronger, and the temperature inside the vehicle can be quickly adjusted to a desired value. Further, when the fan switch 93 is set to Low during manual control, the sound of the fan motor 10 can be reduced even if air conditioning is not performed sufficiently. Further, since the amount of air and the rotational speed of the fan 11 are in a proportional relationship, increasing or decreasing the amount of air means making the rotation of the fan 11 faster or slower, respectively.

As described above, the present invention enables the maximum rotational speed of the fan motor during manual control of a vehicle air conditioner to be set higher than the maximum rotational speed of the fan motor during automatic control, and also enables the maximum rotational speed of the fan motor during manual control. Since the minimum rotational speed of the fan motor can be set to be slower than the minimum rotational speed of the fan motor during automatic control, it is possible to heat or cool the passenger compartment faster than during automatic control, or to reduce the rotation of the fan motor. You can make the sound even quieter.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional vehicle air conditioner;
Fig. 2 is a block diagram showing air volume control, Fig. 3 is a characteristic diagram of a conventional device, Fig. 4 is a block diagram showing air volume control in an embodiment of the present invention, and Fig. 5 is a characteristic diagram of the above embodiment. be. 10...Fan motor, 11...Fan, 71
... Room temperature setting device (sensor), 72 ... Room temperature sensor (sensor), 82 ... Blower voltage calculation circuit (first calculation circuit), 83 ... Motor voltage control circuit (control circuit), 90, 93 ... Fan switch, 92...
...Blower voltage calculation circuit, 94...Blower voltage calculation circuit (second calculation circuit).

Claims (1)

[Scope of utility model registration request] A first calculation circuit that calculates the rotation speed of a fan motor based on a sensor signal during automatic control of a vehicle air conditioner and outputs the rotation speed within a preset control range; and a first calculation circuit that is set according to the operating position of a fan switch. a second arithmetic circuit that outputs the rotation speed of the fan motor during manual control in a control range wider than the control range of the first arithmetic circuit; An air conditioner for a vehicle, comprising a control circuit that performs control based on output.