JPS5849843A - Controlling method of air conditioning equipment - Google Patents

Abstract

PURPOSE:To achieve a comfortable air conditioning by minimizing deviation of the room temperature from the set temperature. CONSTITUTION:Outputs from an operation input unit 1, a target temperature setting device 2 and a room temperature sensor 3 are inputted into a logical operation unit 4 comprising a temperature deviation detector 5, an initial speed setting device 6, an operation/stop signal generator 7, a temperature deviation change detector 8, a temperature deviation upper limit detector 9, a turning speed holding device 10 and a timer 11 to ensure that the rotational speed N of a motor 13 changes by a fixed range in response to variation of the room temperature T at a fixed rate through a motor operation controller 12. At the start of the operation, the room temperature T>TMAX. Therefore, the operation is started at the maximum speed NMAX and then, the speed N is lowered by a fixed range each time the room temperature T falls at a fixed rate after a time t0. In this way, the operation is continued at intrervals of t1...ti1. After the ti1 exceeds the specified time, the speed N is corrected by a value proportional to (T-TR) to bring the room temperature T close to the set value TR. Under such a condition, the operation continues for the time tj1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling an air conditioner equipped with an electric compressor capable of variable speed operation.

The conventional control method of this type is as shown in FIG.
A method in which the rotational speed N of the motor of the electric compressor is controlled to increase or decrease by a certain amount t every time l increases or decreases by a certain amount,
This method is commonly referred to as a proportional control method. In such a proportional control method, due to the balance between the air conditioning load and the air conditioning function, a bias phenomenon occurs in which the room temperature T deviates from the set temperature T l++ even if the operating condition is stable.

That is, when the air-conditioning load is small, the room temperature T1 is close to the set temperature Tm, and when the air-conditioning load is large, the room temperature T1 is controlled to the next point, which is p away from the set temperature Tm. Therefore, if TMAX in Figure 1 is set small, the rotational speed of the motor will change greatly in response to minute temperature changes, which may cause vibrations and noise of the compressor and shorten its life. It becomes more susceptible to the influence of noise signals.

As a means to summarize the above-mentioned drawbacks, temperature deviation T m
-T--Tya exists, there is a method of correcting the rotational speed of the motor by an amount proportional to the integral value of the temperature deviation in a direction to reduce the temperature deviation, that is, an integral control method. In this method, the rotational speed of the motor is increased or decreased in one direction as long as there is a temperature deviation, so even if the sign of the temperature deviation changes and the motor speed is corrected in the opposite direction, the If the sensitivity of the correction is poor, the temperature will exceed the set temperature, and the t or room temperature will fluctuate around the set temperature.On the other hand, if the sensitivity of the correction is good, the rotation speed at room temperature will fluctuate drastically. This may cause problems such as

In view of the above, an object of the present invention is to provide an air conditioner that reduces the deviation of the room temperature from the set value during operation and realizes comfortable air conditioning, in which the room temperature changes in a direction approaching the set temperature. The present invention is characterized in that, after the motor speed is corrected when the room temperature does not change toward the set temperature for a certain period of time, the motor speed is corrected by an amount proportional to the difference between the room temperature and the set temperature.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before explaining one embodiment of the present invention with reference to the drawings, the basic principle thereof will be explained below.

The rotational speed of the motor is N1.The room temperature at which N is determined is T.The newly measured room temperature5. Let them be T and N.

(1) When starting the electric motor, operate the electric motor at the rotational speed N determined by the engine current. Whether the rotational speed N is a fixed value or a value determined based on the room temperature T at the time of startup, as shown in FIG. 1, for example, the motor starts up exactly the same as the previous value when the motor was stopped. The value of this fixed time timer can be regarded as ``When the air conditioner is operated at a certain motor rotation speed, the air conditioning load and the air conditioning function are in balance and the room temperature does not change, that is, Ta shoulder g = Tm''. Select a value that approximates time.

(2) When the room temperature does not change, if the operation of the timer for a certain period of time has been completed, the current motor speed N is corrected by δF of the following equation and the timer is reset for a certain period of time.

a w -K * (T m' - Tm) However, K
1: Ratio measurement - number, Tl: Set temperature (3) When the room temperature changes in the direction approaching the set temperature, that is, if the following formula holds, then lT, M-T Otori 1<ITa''-Tm l Current electric motor The speed N is corrected by δ of the following equation and the timer is reset for a certain period of time.

'11-KP (T ;, '-Ta') (KP is a proportional constant) (4) When the room temperature changes in a direction away from the set temperature, that is, when the following formula holds l T -'-Tm l ＞l T −”−Tl 1
(a) If the timer is operating for a certain period of time, the current motor speed N is corrected by aw given by the following equation.

- Buy = Kp (T m' - T m Win) (Xu) If the fixed time timer has completed its operation, the current motor speed N is corrected by δy of the following equation and the fixed time timer is reset.

am = Kt (Tm'-Tm) As described above, when the room temperature changes so as to approach the set value, in step 11, the motor speed is increased or decreased in proportion to the amount of change. When the room temperature deviates from the set value and tie i is in operation for a certain period of time, the motor speed is increased or decreased in proportion to the amount of temperature change, as described above. If the room temperature is constant or the timer has completed its operation for a certain period of time, the electric motor is controlled proportionally (integral control) to the temperature deviation, which is the amount of room temperature deviation from the set value. It increases and decreases speed.

In this case, K! If Kp is set as follows, the motor speed increment corrected by the above-mentioned integral operation will be equal to or smaller than reduced. Also, when performing an integral operation on the set value of the timer for a certain period of time, ! 2j111
Since the conditions are selected such that the load and the air function are balanced and the room temperature does not change, the room temperature is balanced or nearly balanced near the set value. Therefore, as long as the air conditioning load does not change significantly during the control operation, the room temperature is maintained near the set value.

An embodiment based on the basic gAK described above will be described with reference to FIG.

In Fig. 2, reference numeral 1 indicates an operation input device for specifying operation/stop of the air-utilization device and continuous operation modes such as cooling and heating;
is a setting device that sets the target temperature in the room to be air-conditioned, and 3 is!
- Room temperature sensor consisting of a building star etc. 4 is a temperature deviation detector 5. A logic operation device 12 consisting of an initial speed setter 6, an operation/stop signal generator 7% temperature deviation change detector 8, a temperature deviation upper limit detector 9, an operating speed holder 10, and a timer 11.
1 is a motor operation controller, and 13 is an electric motor.

The operation of this embodiment based on the above-described configuration will be explained.

The operation input device 1 is used to control the operation mode such as cooling or heating, and the operation/stop of the air conditioner is controlled by the setting device 2. are respectively input to the logical arithmetic unit 4. Based on these inputs, the logic operation device 4 performs logic operations and outputs the operation/stop signal and speed signal of the electric motor 13 to the electric motor operation controller 12. According to these signals, the operation controller 12 operates the electric motor @13. performs operational control.

At the same time, the logical operation unit 4 also controls the drive of the blower and various valves of the air conditioner.

Next, the operation of each device of the logical operation device 4 will be explained in detail.

The temperature deviation detector 5 detects the set value of the setting device 2 and the room temperature sensor 3.
The measured temperature is compared with the room temperature, and the temperature deviation JT is converted into a digital value and held.

The initial speed generator 6 operates when the operation signal of the operation input device 1 changes from the stop side to the operation side P, and when the operation/stop signal generator 7 of the electric motor 13 first generates an operation signal of the electric motor. Then, using the output ΔT of the temperature deviation detector 5, the initial rotation speed of the electric motor is determined and set in the operating speed holder 10 according to the cooling/heating operation mode, for example, as shown in FIG.

In this case, since the initial rotation speed is set in the operating speed holder 10 only when the motor starts operating for the first time based on the operation signal, during subsequent intermittent operation of the motor, the initial rotation speed of the motor will be the same as that at the previous motor stop. The rotational speed will be at the time.

Electric motor operation/stop signal generated! 7 generates a stop signal for the electric motor 18 when the operation signal from the operation input device 1 is on the stop side. When the operation signal is on the operating side, the output signal l T m (-T--Tmj
is positive, the operating signal of the electric motor 13 is set to a constant value (T -
Tm) If it is too small, a stop signal will be generated.

The temperature deviation change detector 8 stores the output signal dT of the temperature deviation detector 5 when the output signal of the motor stop signal generator 7 changes to the operating side. , starts timer ll for a certain period of time. after that,
While the output signal of the operation stop signal generator 7 is on the operating side, the output signal ΔT of the temperature deviation detector 5 and the stored temperature deviation are detected at intervals as short as the set value of the timer for a certain period of time. Compare them, and if they match and the operation of the timer 11 has been completed for a certain period of time, an integral operation is performed to add ax;'-KtΔT to the speed data held in the operating speed holder 14', and The timer 11 is restarted for a certain period of time.

If the above two do not match, the temperature deviation JT-.

At the same time, check whether ΔT is approaching or away from the set temperature TmK. If it is approaching, it is proportional to the change in temperature deviation during the daytime, ΔT, -ΔT.
=rsv (IT, -r'1'I+" J k,
, A rotation speed 1fffl Holder 1 OK Performs proportional operation to add to the retained speed data, and also performs tie-11 for a certain period of time.
1 will restart.

(Above) When T1 is apart from Tm, if the timer 11 is operating for a certain period of time, the same proportional operation as above is performed. In this case, the timer 11 is not reset for a certain period of time, so the integration operation continues. If the fixed time timer ff1l has completed its operation, the same integration operation as above is performed, and at the same time, the four fixed time timers 11 are reset.

The temperature deviation change detector 8 detects the maximum speed when the speed obtained in the above speed correction operation exceeds a predetermined maximum speed, and the minimum speed when it falls below the minimum speed. It operates to keep the operating speed holder 10 constant.

The temperature deviation upper limit detector 9 is configured such that when the output signal of the operation stop signal generator 7 is in the operating example, the output signal ΔT of the temperature deviation detector S is a constant upper limit value TM&! - Longer than Tm,
For cooling, the electric motor 1 is determined according to the heating operation mode.
3 is set in the operating speed holder 10.

A speed signal is sent to the motor operation controller 12. Based on the results, the motor operation controller 12 starts the motor 13 using the operation signal generated by the operation stop signal generator 70, operates the motor 13 to stop using the stop signal, and operates the motor 13 to stop the motor 13 using the stop signal.
During operation, the speed of the electric motor 13 is controlled to match the operating speed specified by the operating speed holder 10.Next, the control operation in the present invention will be explained with reference to FIG. A, B, and C in the same figure represent changes in room temperature, "@s '1.
. . . indicates the state of change in motor speed and the duration of the same speed.

At the start of operation, since the room temperature T>'l'MmX, the electric motor starts operating at the maximum speed t0. This speed 1, ″”
(After t time has elapsed, the room temperature decreases by a certain amount from TMAx, and the motor speed also decreases by a certain amount to tl. After that, every time the room temperature decreases by a certain amount, the motor speed also decreases by a certain amount. Then Ll"'e tl...changes like the opening.

When the room temperature stops changing in the above conditions t and 'jl, in the conventional proportional control method, the motor operation controller is released, for example, when the room temperature changes, the actual temperature and the IC break! The quality of the insulation is improved, and the room temperature is maintained at a value higher than the set value Ts. When the present invention is applied in the state of one sip, that is, when the duration of one sip exceeds a predetermined value, the motor speed is corrected by an amount proportional to (TTm)K in the direction of bringing the room temperature T closer to the set value Tm, and the motor speed becomes t. Thereafter, as the room temperature decreases, the motor speed is reduced in the same way as above, and when the room temperature stops changing, the motor speed becomes t. In this period t, the motor speed is similarly corrected, resulting in the state t20. When this operation is repeated and the room temperature T matches the set value TmK,
1 motion - speed is t%.

The state will be as follows.　　　　.

When air conditioning load fluctuations and air conditioning function fluctuations occur due to changes in outdoor temperature, etc., the results appear in room temperature fluctuations. Even when this room temperature fluctuation occurs, according to the present invention, the room temperature T is always operated so as to approach the set value TmK, so the room temperature T is always set to the set value Tmt7t.
It is controlled to a position slightly shifted from B. Therefore, according to the present invention, comfort can be significantly improved compared to the conventional proportional control system.

The motor speed control operation in the present invention 1i111 is performed in particular to prevent the room temperature T from becoming too high, in other words, from falling below the set value T1. However, in the conventional and integral control methods, the room temperature T is finally made to match the set value Tm, but the speed control operation of the motor, especially switching from speed increase to deceleration or from deceleration to speed increase, takes advantage of the excessive speed of the room temperature TO. It is being done.

Therefore, according to the control operation of the present invention, it is possible to realize a more comfortable air-conditioned state because there is less vertical vibration in the room temperature.

As explained above, according to the present invention, it is possible to not only eliminate the unbalanced deviation of the room temperature in the conventional proportional control method, but also eliminate the vertical fluctuation of the room temperature in the conventional integral control method, and bring the room temperature to the target temperature. -11], comfort can be further improved.

[Brief explanation of the drawing]

Figure 1 shows 1l1 of the control method in the conventional proportional control system.
1 and 2 are block diagrams of a ratio control device to which the control method of the present invention is applied, and FIG. 3 is an explanatory diagram of the air conditioning state and the rotational speed control state of the electric motor according to the present invention. l...Operation input device, 2...Target temperature setting device, 3...
・Room temperature sensor, 4...Logic operation device, 5...Temperature deviation detector, 6...Initial speed setter, 7...Run/stop signal generator, 8...Temperature deviation change setter ,9...
Temperature deviation upper limit detector, 10... Operating speed holder, 11
...Timer, 12...Motor operation controller, 13...
·Electric motor. Part 1 Prisoner (Th 22nd)

Claims (1)

[Claims] The rotational speed of the motor of the electric compressor is controlled to increase or decrease by a certain amount t every time the room temperature increases by a certain degree t+. A control method for an air conditioner, comprising: correcting the motor speed by an amount proportional to the difference between the room temperature and the set temperature if the room temperature does not change in a direction approaching the set temperature for a certain period of time after correcting the motor speed.