JPH07822Y2 - Inverter type air conditioner controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a control device for an inverter type air conditioner which is applied to control the blowout temperature of an inverter type air conditioner.

[Conventional technology]

FIG. 3 is a heating operation control block diagram of a conventional air conditioner, and the heating operation of the conventional example shown in FIG. 3 will be described. In FIG. 3, reference numeral 11 denotes an indoor controller, and a compressor (not shown) normally has a PID calculation unit 13 according to a deviation between an indoor-side intake air detection temperature Ta (hereinafter, referred to as a detection temperature Ta) and a set temperature SP _2. Then, the PID calculation is performed, the conversion result is converted by the conversion gain unit 14 into an inverter frequency corresponding to the calculated value, and the inverter driving unit 15 is instructed to be controlled by an inverter (not shown).

Further, in the case of controlling by the blowout temperature, the conversion gain unit 14 at the time of controlling by the indoor side intake air temperature Ta
The PID calculation value of is cleared (zero), and the PID calculation unit 12 calculates the PID according to the deviation between the detected temperature Th of the indoor heat exchanger (not shown) (hereinafter referred to as the detected temperature Th) and the set temperature SP _1. Then, the conversion gain section 14 converts the frequency into an inverter frequency corresponding to the calculated value, and the inverter drive section 15 is instructed to be controlled by an inverter (not shown).

[Problems to be solved by the device]

FIG. 4 is a diagram showing the result of controlling the inverter frequency and controlling the blowout temperature in the above-mentioned conventional example. In FIG. 4, FIG. 4 (a) shows a change with respect to time at the start of heating operation. Therefore, the detected temperature Th steadily rises with respect to the set temperature SP ₁ , and the indoor blowing temperature also rises accordingly. When the inverter frequency rises, the output
It operates at 100% of 100 Hz, decreases as the deviation decreases, and stabilizes after a certain period of time.

Further, in FIG. 4, FIG. 4 (b) shows a change with respect to time when the blowout temperature control function is operated during the normal heating operation (heating operation by the intake air temperature control). The deviation from the detected temperature Th with respect to the set temperature SP ₁ is large to some extent, but the value of the integral term in the PID calculation formula is the switching point P ₁
Since it is still small in the vicinity, the PID calculation value becomes small, and as a result, the inverter frequency decreases by H.

Then, after a while, the value of the integral term in the PID calculation formula becomes large, so that the inverter frequency starts rising.

To up to that result, returns to the inverter frequency of the switching point P ₁
Since the time detection temperature Th does not rise, the time T for reaching the set temperature SP ₁ becomes long and comfort is impaired.

Further, since the inverter frequency is excessively decreased by H, the fluctuation range of the inverter frequency is widened, and there is a problem that noise and vibration of the compressor are increased.

An object of the present invention is to provide a control device for an inverter type air conditioner that can solve the above conventional problems.

[Means for Solving the Problems]

The control device of the inverter type air conditioner according to the present invention calculates the deviation between the detected temperature and the set temperature of a predetermined part by PID, and adds the initial value from the initial value setting section to the calculated value in the conversion gain section. When a PID operation system switching command is issued during operation in an inverter type air conditioner control device that has a plurality of PID operation systems for the control system that converts the inverter frequency and drives the inverter A control system for setting the gain value of the inverter frequency of the conversion gain unit before switching as an initial value in the initial value setting unit is additionally provided.

[Action]

According to the present invention, an air conditioner that controls the inverter frequency by performing PID calculation has two or more systems of PID calculation units.
In the indoor controller composed of the initial value setting part of the calculated value and the conversion gain part, while the inverter frequency is being controlled using the PID calculating part of the first system,
When a command to switch to the PID calculation unit is issued, the gain value of the inverter frequency of the conversion gain unit that has been driven until now is sent to the initial value setting unit as the initial value. PID when switching from the normal heating operation that keeps the
Even if the value of the integral term in the equation is small, the inverter frequency during normal operation is secured, and the value of the proportional term in the PID equation is stepped according to the deviation between the set temperature SP ₁ and the detected temperature Th. Therefore, the inverter frequency rises rapidly and the detected temperature Th approaches the set temperature SP _{1 in a} short time.

〔Example〕

FIG. 1 is a control block diagram during heating operation according to an embodiment of the present invention, in which 1 is an indoor controller, 2 is a PID calculator, and 3 is
Is an initial value setting unit, 4 is a conversion gain unit, 5 is a PID calculation unit,
Reference numeral 6 indicates an inverter drive unit.

In FIG. 1, when the heating operation for controlling the indoor side intake air temperature to a constant level is started, depending on the deviation between the indoor side intake air detection temperature Ta (hereinafter, referred to as the detection temperature Ta) and the set temperature SP _2. Then, the PID calculation unit 5 performs PID calculation, and the conversion gain unit 4 converts the calculation result into an inverter frequency corresponding to the calculated value and instructs the inverter drive unit 6 to control it by an inverter (not shown).

The initial value C _{0 in} this case is zero due to the rise of normal heating operation, but in the conversion gain unit 4, the calculated value C ₂ + the initial value
The sum of C ₀ is converted into an inverter frequency and the inverter drive unit 6 is instructed.

Further, when the heating operation is started by controlling the blowing temperature at a constant level, the deviation between the set temperature SP ₁ and the detected temperature Th is calculated by the PID calculation unit 2 (calculation value C ₁ ) and the initial value setting unit 3 Initial value of
C ₀ is added and input to the conversion gain unit 4. The initial value C _{0 in} this case is zero because of the start-up operation.

Next, a case will be described in which the air temperature is switched to the constant control during the operation after the startup of the normal heating operation in which the intake air temperature is controlled to be constant.

First, the start-up operation is as described above. Now, when the blowout temperature is switched to a constant control while being driven at a certain inverter frequency, the input value C ₂ corresponding to the inverter frequency so far is input to the conversion gain unit 4, and the signal of the conversion gain unit 4 is input. C ₂ is input and set to the initial value setting unit 3 as the initial value C ₀ = C ₂ . Also, set temperature SP ₁ and detected temperature Th
Due to the deviation from the above, the calculated value C ₁ is added to the set initial value C ₀ from the PID calculation unit 2 and input to the conversion gain unit 4.

As a result, the inverter frequency is combined with the inverter frequency before the blowout temperature is switched to the constant control and the new inverter frequency which is PID-calculated after the blowout temperature is switched to the constant control and is sent to the inverter drive unit 6. It will be.

FIG. 2 illustrates the above with the passage of time. In FIG. 2, FIG. 2 (a) shows a heating start-up operation under constant blowout temperature control, and FIG. 2 (b) shows constant control of blowout temperature at a change point P ₁ during normal heating operation. Shows the case of switching to.

[Effect of device]

According to the present invention, the decrease in the inverter frequency (H in Fig. 4) that occurs when the blowout temperature is switched from the conventional normal heating operation to the constant control is eliminated, and the detected temperature Th is the set temperature.
The time T to reach SP ₁ is faster, the comfort is better,
Since the inverter frequency does not drop excessively and the fluctuation range of the inverter frequency becomes small, noise and vibration of the compressor can be minimized.

[Brief description of drawings]

FIG. 1 is a control block diagram during heating operation as one embodiment of the present invention, FIG. 2 is an operation characteristic diagram of one embodiment of the present invention, FIG. 3 is a conventional heating operation control block diagram, and FIG. [Fig. 4] is an operating characteristic diagram of a conventional example. 1 ... Indoor controller, 2 ... PID calculation unit, 3 ... Initial value setting unit, 4 ... Conversion gain unit, 5 ... PID calculation unit,
6 ... Inverter drive section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Iwaki, Izumi Izumi, Aichi Prefecture, Nishi-Kasugai-gun, Nishibiwajima-cho, Asahi-cho, 3-chome, Mitsubishi Heavy Industries, Ltd. (56) Reference JP-A-60-245956 (JP, A) )

Claims (1)

[Scope of utility model registration request] 1. A deviation between a detected temperature of a predetermined part and a set temperature is calculated.
The PID calculation system is added and the initial value from the initial value setting section is added to the calculated value, and the conversion gain section converts it to the inverter frequency and drives the inverter. In the control device of the inverter type air conditioner to be operated, when the switching command of the PID calculation system is issued during operation, the gain value of the inverter frequency of the conversion gain unit before switching is set in the initial value setting unit as an initial value. A control device for an inverter type air conditioner, which is provided with a control system.