JPH0127445Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention is for controlling the amount of air blown into the vehicle interior by adjusting the rotational speed of the blower in an automobile air conditioner.

(Prior Art) Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 57-107912, the rotation speed of a blower is determined according to a specific pattern according to the value of a comprehensive signal T corresponding to the air conditioning load in the vehicle interior. It is known to automatically control the air mix door position. The specific pattern is, for example, T ₁ of the total signal, as shown in FIG.
In the range of ≦T≦T ₂ , the rotation speed of the blower is fixed at a low speed, while the air mix door is changed according to the overall signal T, and as it deviates from the range of T ₁ ≦T≦T ₂ , it gradually increases to a high speed. The number of revolutions of the blower is increased.

(Problem to be solved by the invention) However, in the above fixed range T ₁ ≦ T ≦ T ₂ , even if the set temperature of the temperature setting device is changed, the rotation speed of the blower remains constant and the air volume does not change. Although the air load and air conditioning capacity are well-balanced, there is a drawback that the intentions of the occupants are not reflected, contrary to the expectations or common sense of the occupants that changing the settings will change the air volume.

Therefore, this invention eliminates the above-mentioned conventional drawbacks caused by the control characteristics of the blower, and is an automotive air conditioner that can provide an appropriate air conditioning feeling in accordance with the passenger's intentions without fundamentally changing the control characteristics of the blower. An object of the present invention is to provide an air volume control device.

(Means for Solving the Problems) The gist of this invention is to provide an air volume control device for an automobile air conditioner in which the rotation speed of the blower is constant within a predetermined heat load range. An automobile provided with a means for increasing the rotation speed of the blower using a change in the set temperature by a temperature setting device as a trigger signal when the rotation speed of the blower is at the constant rotation speed, and then gradually returning the rotation speed to the original constant rotation speed. It is in the air volume control device of the air conditioner.

(Function) Therefore, as shown in Figure 2, when the set temperature of the temperature setting device is changed at time t ₀ , the rotation speed of the blower is simultaneously increased rapidly, and then gradually returned to the original constant rotation speed. Therefore, when operating the temperature setting device, an appropriate change in air volume can be obtained, and therefore the above-mentioned problem can be achieved.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1a shows a first embodiment of this invention, which includes a signal detection circuit 1, an amplifier circuit 2,
It is composed of an output control circuit 3.

The signal detection circuit 1 inputs the output signal of the temperature setting device 4 and outputs the variation thereof as a substantially sawtooth wave signal, and includes resistors 5, 6, 7, 8, operational amplifiers 9, 10, diodes 11, 12, capacitor 1
3, 14, resistors 15, 16, field effect transistors 17, 18, and resistors 19, 20, and the circuit composed of the operational amplifier 9 and the field effect transistor 17 operates only when the input signal increases. The circuit composed of the operational amplifier 10 and the field effect transistor 18 outputs a single substantially sawtooth wave signal only when the input signal decreases, and the slope of the slope of the substantially sawtooth waveform is as follows.
They follow time constants determined by the combinations of capacitor 13 and resistor 15, and capacitor 14 and resistor 16, respectively.

The amplifier circuit 2 inputs the output signal of the signal detection circuit 1 and the output signal of the temperature setting device 4 and outputs a positive substantially sawtooth wave signal regardless of the increase or decrease of the temperature setting device 4. , 23, diode 2
4, 25, and operational amplifiers 26, 27.

The output control circuit 3 inputs the output signal of the amplification circuit 2 and inputs the output signal of the amplification circuit 2 to the operational amplifier 10 of the signal detection circuit 1.
The same circuit as the circuit consisting of the field effect transistor 18 is used in part to extract a substantially sawtooth wave signal, and this substantially sawtooth wave signal is transmitted to a constant rotation speed range of the blower (for example, as shown in FIG. 3). The output is performed only in the region T ₁ ≦T≦T ₂ ). This circuit consists of resistors 28, 29, 30, 31,
operational amplifier 32, comparators 33, 34, resistor 35,
Diodes 36, 37, capacitor 38, resistor 3
9, 40, field effect transistor 41, resistor 4
2, diodes 43, 44, and a resistor 45, an operational amplifier 32, and a field effect transistor 4.
1 is the same circuit as the operational amplifier 10 and field effect transistor 18 of the signal detection circuit 1. The circuit composed of comparators 33 and 34 constitutes a window comparator circuit, and as mentioned above, the total signal T
However, when T ₁ ≦T≦T ₂ , the output of the output control circuit 3 is set to “L” and the output of the substantially sawtooth wave signal is prohibited.

In the above configuration, when the blower (not shown) is operating in a constant rotation speed range, when the setting signal of the temperature setting device 4 is changed in the direction of increasing, the signal detection circuit 1 detects the operational amplifier 9 and A circuit including the field effect transistor 17 outputs a change in the input signal as a substantially sawtooth wave signal, which is converted into a positive substantially sawtooth wave signal by the operational amplifier 26 and input to the output control circuit 3. Ru. The output control circuit 3 converts the input signal into a substantially sawtooth wave signal with a predetermined time constant, and outputs the signal to a drive circuit (not shown). Therefore, since this approximately sawtooth wave control voltage is applied to the blower via a drive circuit (not shown), the rotation speed of the blower increases at the rising edge of the approximately sawtooth wave, and then increases exponentially. As the voltage decreases, the rotation speed also decreases and returns to the constant rotation speed before operating the temperature setting device 4. Furthermore, when the setting signal of the temperature setting device 4 is decreased, the polarity of the substantially sawtooth wave signal of the signal detection circuit 1 becomes opposite to that in the above case, but the input of the operational amplifier 27 is also opposite to that of the operational amplifier 26. , its output is also a positive substantially sawtooth signal, and the rest is the same as in the previous case.

A second embodiment is shown in FIG. It is composed of a signal detection amplification circuit 46 and an output control circuit 3, and the signal detection amplification circuit 46 includes a capacitor 47, resistors 48, 4
9, 50, 51, 52, operational amplifier 53, capacitor 54, diode 55, 56, resistor 57, 5
8 and a capacitor 59, and only the change in the input signal, that is, the change in the output voltage of the temperature setting device 4 is input to the operational amplifier 53 via the capacitor 47. Then, the signal amplified by the operational amplifier 53 is transferred to the resistor 58 and capacitor 5 on the output side.
9, the signal is converted into a substantially sawtooth wave signal and is input to the output control circuit 3.

(Effects of the invention) As described above, according to this invention, even if the blower is controlled in a constant rotation speed range, when the set temperature of the temperature setting device is changed, the rotation speed of the blower temporarily increases. Then, the rotation speed is gradually returned to a constant speed, so that the air conditioning feeling expected by the occupants can be obtained without disturbing the temperature balance in the cabin, and the temperature in the cabin can be quickly brought to the target temperature. This has the effect of making it possible.

[Brief explanation of the drawing]

Fig. 1a is a circuit diagram showing a first embodiment of this invention, Fig. 1b is a circuit diagram showing a second embodiment of the same, and Fig. 2 is a characteristic showing the control characteristics of the blower in the above embodiment. FIG. 3 is a characteristic diagram showing the control characteristics of a conventional blower and air mix door. 1...Signal detection circuit, 2...Amplification circuit, 3...
Output control circuit, 4... Temperature setting device, 46... Signal detection amplifier circuit.

Claims (1)

[Scope of utility model registration request] In an air volume control device for an automobile air conditioner that maintains a constant rotation speed of a blower within a predetermined heat load range, when the rotation speed of the blower is at the constant rotation speed, a change in the set temperature by a temperature setting device. An air volume control device for an air conditioner for an automobile, comprising means for increasing the rotational speed of the blower using a trigger signal, and then gradually returning the rotational speed to the original constant rotational speed.