JPS6310324Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention aims to simplify operation of a speed control device for a fan motor in a vehicle air conditioner, and to adapt to changes in the interior environment of a vehicle. The purpose is to perform speed control that can respond quickly.

(Prior art) Conventionally, the speed control of a fan motor used in a vehicle air conditioner has been described, for example, in U.S. Pat.
As disclosed in the publication, the voltage applied to the motor is changed by operating a lever slide or rotary switch located on the instrument panel of the driver's seat to change the value of the resistance connected to the motor. This is done by letting people know.

The number of switching stages is generally 3 or 3, and the passenger sets the lever slide or rotary switch to the position that provides the air volume closest to the desired air volume, and then selects the desired cabin interior. You will get air conditioning.

(Problem that the invention aims to solve) However, the environment inside the vehicle interior is sensitive to the influence of the outside world, and especially when the vehicle is running in a city, the hot water circulation due to the decrease in engine speed Due to the occurrence of a decrease in the amount of refrigerant, a decrease in the amount of refrigerant circulated, or a stoppage of the circulation, the environment in the interior space of the vehicle changes particularly significantly. To be more specific, the state of the air in the vehicle interior, such as temperature and humidity, is directly influenced by the outside world as described above, and also fluctuates greatly due to the opening and closing of various doors of the air conditioner. do.

Therefore, in order to maintain a constant environment in the vehicle interior, the occupant must frequently operate the aforementioned lever slide or rotary switch (because the number of setting stages is small, the frequency of operation inevitably increases).
It is necessary to control the speed of the fan motor,
This lever slide or rotary switch is
When performing frequent operations, there is a problem in that the operability is poor, and the occupants may feel that these frequent operations are troublesome.

Furthermore, since the voltage applied to the motor is set using the voltage drop caused by the resistance, power is wasted due to this resistance, which goes against energy conservation. There was also this problem.

Therefore, the present invention has been developed to provide a vehicle air conditioner that can control the speed of a fan motor with a simple operation, is highly operable, and can also effectively utilize the electric power supplied to the motor. An object of the present invention is to provide a speed control device for a fan motor in a device.

[Structure of the idea]

(Means for Solving the Problems) To achieve the above object, the present invention provides a speed control device for a fan motor in a vehicle air conditioner equipped with a drive device that supplies electric power to the fan motor from a power source. first and second switches; an oscillator that outputs pulses at a predetermined frequency;
A counter that counts the pulses output from the oscillator, and when the first or second switch is operated, the counter should count up or down the pulses output from the oscillator within a predetermined range. A counter control circuit that outputs a signal, a pulse output unit that outputs a pulse with a pulse width corresponding to the count value of the counter, and a switching unit that controls power supplied to the fan motor using the pulse output from the pulse output unit. The device is characterized by comprising a device.

(Operation) The fan motor speed control device configured as described above operates as follows.

When the passenger presses the first switch, while the switch is pressed, the pulses output from the oscillator are counted up by the counter while being controlled by the counter control circuit, and the pulse output means receives the count value of this counter. A pulse with a pulse width corresponding to 1 is applied to the switching element, and the power supplied to the fan motor is gradually increased.

On the other hand, when the passenger presses the second switch, the counter counts down in the opposite way to the above, and the electric power supplied to the fan motor is gradually reduced.

Therefore, when adjusting the air volume, the crew should
All you have to do is press either the first switch or the second switch, and the number of adjustment stages is greater than that of conventional switches, making it easier to obtain the desired air volume. This means that the number of operations for adjustment can be reduced.

Furthermore, since the power supplied to the fan motor is controlled by the switching operation of the switching element, it is possible to effectively utilize the power.

Note that since the counter control circuit described above operates to suppress the count value of the counter within a certain range, the electric power supplied to the fan motor always changes within a certain range.

(Example) The present invention will be described in detail below based on an example shown in the accompanying drawings.

FIG. 1 is a circuit diagram showing an embodiment of a speed control device according to the present invention. In this figure, push button type switches are used as the first and second switches.
Both SU and SD are placed at appropriate positions on the instrument panel (not shown). This switch SU,
One end of the SD is connected to the power supply VC, and the other end is connected to the AND gate 21 and 22.
Each is connected to an OR gate 11. This OR
The output of the gate 11 is input to the AND gate 12, and the AND gate 12 is further equipped with an oscillator (hereinafter referred to as "OSC") that generates appropriate pulses.
13 pulse outputs are also connected to be input. Next, the output of the AND gate 12 is input to the IN terminal of the counter 14, and the MD terminal of the counter 14 is connected to the other end of the switch SD. The counter 14 has four output terminals OA to OD, and has a function of outputting the counted value as a 4-bit binary code. Further, the counter 14 is of an up-down type, and when the MD terminal is at the "L" level, it counts up the input pulse at the IN terminal, and when the MD terminal is at the "H" level, the IN terminal is input Count down the pulse. Note that when the count value reaches the maximum (15), a NAND gate 23 is provided as an input to the AND gate 21 in order to prevent up-counting even if there is an input pulse to the IN terminal, and this input is connected to the counter 14 and the pulse output means. It is assumed that the oscillation modulator 15 is connected to a certain oscillation modulator 15.
Also, when the count value reaches the minimum 0, the IN
An OR gate 24 is provided as one input of the AND gate 22 in order to prevent the counter from downcounting even if there is an input pulse to the terminal. these
AND gates 21, 22, NAND gate 23 and
The OR gate 24 constitutes a counter control circuit.

Next, the output terminals OA to OA of this counter 14
OD is connected to input terminals IA to ID of an oscillation modulator 15, respectively, and an output terminal OP of this oscillation modulator 15 is connected to the base of a transistor 16, which is a switching element. Oscillation modulator 1
Numeral 5 has a function of modulating the pulse width in accordance with the output value of the counter 14 and outputting the modulated pulse width.

The collector of the transistor 16 mentioned above is connected to a power supply VC via a fan motor 18 whose rotational speed is controlled, and the emitter is connected to ground via a switch 17.

Note that the OSC 13, counter 14, and oscillation modulator 15 are connected to the power supply VC and ground as appropriate to be driven. OR gate 1
1. The same applies to the AND gate 12 although it is not shown.

Next, the overall operation of the above embodiment will be explained based on the time chart shown in FIG.

First, when the switch 17 is turned on, the transistor 16 becomes conductive and the fan motor 18 is energized and rotates. Assuming that the value of the counter 14 is "10", the state will be at time T0 in FIG. 2. Next, at time T1, the passenger presses the switch SU to increase the air volume, that is, the rotational speed of the fan motor 18. Assuming that this state continues until time T2, during this time the OR gate 1
1's output becomes "H" level, AND gate 1
2 outputs the pulse shown in FIG. 2 (E). On the other hand, since the MD terminal of the counter 14 is at the "L" level, the counter 14 performs up-counting based on the output pulse of the AND gate 12. That is, the count value increases as "10", "11", "12", and "13", and becomes "14" at time T2, and the output terminal OA is "L" and the other output terminals OB, OC, OD becomes “H” level. (See Figure 2 F, G, C, R). Therefore, the width of the output pulse of the oscillation modulator 15 gradually increases from time T1 to T2, and therefore the conduction time of the transistor 16 also increases. That is, since the electric power supplied to the fan motor 18 gradually increases, the rotational speed increases (see FIG. 2).

Next, in order to reduce the rotational speed of the fan motor 18, the passenger presses the switch SD at time T3.
Assume that this state continues until time T4. During this period, the output of the OR gate 11 becomes "H" level, and the pulse shown in FIG. 2E is output from the AND gate 12. On the other hand, since the MD terminal of the counter 14 becomes "H" level, the AND gate 12
The counter 14 counts down by the output pulse. In other words, the count value is
"14", "13", "12", "11", "10", "9", "
8'' and becomes ``7'' at time T4, and the output terminal OD becomes ``L'' level (FIG. 2 F, G,
(See H, L). Therefore, the width of the output pulse of the oscillation modulator 15 gradually becomes smaller from time T3 to T4, and therefore the conduction time of the transistor 16 also becomes shorter. In other words, since the electric power supplied to the fan motor 18 gradually decreases,
The rotational speed will decrease (see Figure 2).

To summarize the above operations, when the passenger wants to increase the air volume, he/she can hold down the switch SU for a time corresponding to the degree of increase, and when he/she wants to decrease the air volume, he/she only has to hold down the switch SU for a time corresponding to the degree of decrease. Just keep pressing the switch SD. As mentioned above, the counter 14 counts up to the maximum value, but does not count beyond that, so even if the switch SU is pressed, the air volume does not increase.
The same applies to the down count. Therefore, an inappropriate operation such as sudden change from the minimum air volume to the maximum air volume is not performed, and the air volume can be controlled continuously and satisfactorily.

[Effect of idea]

As described above, the present invention provides the first speed control device for a fan motor in a vehicle air conditioner.
and a second switch, an oscillator that outputs pulses of a predetermined frequency, a counter that counts the pulses output from the oscillator, and when the first or second switch is operated, the counter a counter control circuit that outputs a signal for up-counting or down-counting pulses output from an oscillator within a predetermined range; a pulse output means that outputs a pulse having a pulse width corresponding to the count value of the counter; and the pulse output. a switching element for controlling the electric power supplied to the fan motor by means of pulses outputted from the means, the value of the counter is increased by pressing the first switch, and the value of the counter is increased by pressing the second switch. Since the value of the counter is decreased and the ON time of the switching element is changed according to the value of the counter, the speed of the fan motor can be set to a desired speed by a simple operation, and Its operability will also be improved.

Furthermore, since the electric power supplied to the fan motor is controlled by the switching operation of the switching element, the effective use of the supplied electric power can be maximized.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a speed control device for a fan motor in a vehicle air conditioner according to the present invention, and FIG. It's a chat. SU...first switch, SD...second switch, VC...power supply, 13...oscillator, 14...counter, 15...oscillation modulator (pulse output means), 16...transistor (switching element) ), 18...fan motor, 21, 22...
AND gate (counter control circuit), 23...
NAND gate (counter control circuit), 24...
OR gate (counter control circuit).

Claims (1)

[Claims for Utility Model Registration] A speed control device for a fan motor in a vehicle air conditioner equipped with a drive device that supplies electric power to the fan motor from a power source, comprising: first and second switches; and a pulse of a predetermined frequency. an oscillator that outputs an oscillator; a counter that counts pulses output from the oscillator; and a counter that counts pulses output from the oscillator within a predetermined range when the first or second switch is operated. a counter control circuit that outputs a signal to count or down-count; a pulse output means that outputs a pulse with a pulse width corresponding to the count value of the counter; and a pulse output from the pulse output means that supplies the fan motor with the pulse output. 1. A speed control device for a fan motor in a vehicle air conditioner, comprising a switching element for controlling electric power.