JPH04257644A - Control method of air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to allow indoor load to reach setting temperature swiftly irrespective of its magnitude by controlling the operation power based on the comparison between a forecasted operation time required for indoor air temperature to arrive at the setting temperature and setting operation hours. CONSTITUTION:An indoor temperature T is detected at a constant time interval DELTAtheta, the difference DELTAt between the current and previous detected values is divided by time interval DELTAtheta, thereby computing temperature change velocity V at that point of time. Required operation time THETA which arrives at setting temperature TS is computed by this temperature velocity V. A plurality of setting operation hours, tau1, tau2,...tauB (tau1>tau2, n stands for natural number), which arrive at the setting temperature TS is compared and switched over to select operation power, depending on the position of the required operation hour THETA. This construction makes it possible to force indoor load to arrive at the setting temperature swiftly and surely irrespective of magnitude.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control method for controlling indoor temperature in accordance with load conditions.

0002

[Prior Art] Conventionally, the capacity switching control of an air conditioner equipped with a compressor and using expansion and compression of refrigerant has been performed using a thermistor built into a wireless remote controller or an indoor air temperature detection thermistor at the indoor air inlet. Based on the detected indoor air temperature signal, normal air conditioners control the compressor on and off and switch the air flow rate of the indoor fan between high, medium, and low. In an air conditioner, this is done steplessly by controlling the rotational speed of the compressor and indoor fan.

FIG. 2 is a schematic diagram showing an example of the refrigeration cycle of a normal air conditioner. The outdoor unit A includes a compressor 1, a four-way valve 2 connected to the discharge side of the compressor 1, and
The outdoor heat exchanger 3 connected to the four-way valve 2, the capillary tubes 4, 4 connected to the outdoor heat exchanger 3, the check valve 5 connected to the capillary tubes 4, 4, and the check valve 5 bypassed. A capillary tube 6, a strainer 7, and an accumulator 8 connected to the suction side of the compressor 1 are arranged. An outdoor fan (not shown) and an indoor fan (not shown) are installed opposite the outdoor heat exchanger 3 and the indoor heat exchanger 11, respectively.

During cooling operation, as shown by the arrow F1, the gas refrigerant is compressed by the compressor 1 to become a high-pressure gas refrigerant, which is sent from the four-way valve 2 to the outdoor heat exchanger 3, where it is cooled and then passed through the capillary tube. The gas refrigerant is adiabatically expanded and liquefied in 4 and 4, and is sent to the indoor heat exchanger 11 from the liquid side piping 9 through the check valve 5 and the strainer 7, where it absorbs heat and evaporates, and is transferred from the gas side piping 10 to the low-pressure gas refrigerant. The air is sucked into the compressor 1 from the four-way valve 2 via the accumulator 8.

During heating operation, as shown by arrow F2, the gas refrigerant is compressed by the compressor 1 to become a high-pressure gas refrigerant, which is sent from the four-way valve 2 to the indoor heat exchanger 11 via the gas side pipe 10. It radiates heat and liquefies, and is sent from the liquid side piping 9 to the outdoor heat exchanger 3 via the strainer 7, capillary tube 6, and capillary tubes 4, 4, where it absorbs heat and evaporates. 2 is drawn into the compressor 1 via the accumulator 8.

As shown in FIG. 3, the capacity switching control of the air conditioner is such that the capacity is switched in accordance with the indoor air temperature, and is operated at high capacity during cooling operation, and when the indoor air temperature is low. When the temperature decreases and reaches a temperature (27 degrees Celsius) that is 2 degrees higher than the set temperature Ts (for example, 25 degrees Celsius), the capacity is switched from strong to medium, and the indoor air temperature further decreases to 1 degree higher than the set temperature Ts. High temperature (26 degrees Celsius)
When the temperature reaches the set temperature Ts (25 degrees Celsius), the capacity is switched from medium to weak, and when the temperature drops to the set temperature Ts (25 degrees Celsius), it switches to air-only operation, until the temperature reaches the set temperature Ts (24 degrees Celsius), which is one degree lower than the set temperature Ts. When the temperature drops, the operation is stopped, and when the indoor temperature rises from the stopped state when the temperature is lower than the set temperature Ts and reaches the set temperature Ts (25 degrees Celsius), ventilation starts, and the temperature (1 degree higher than the set temperature Ts) is started. When the temperature reaches 26 degrees Celsius), low capacity operation starts, and when the temperature reaches 2 degrees higher than the set temperature Ts (27 degrees Celsius), the capacity is switched from low to medium, and then 2 degrees higher than the set temperature Ts. When the temperature reaches 27 degrees Celsius, the ability switches from medium to strong. Here, during the ventilation operation, the compressor is turned off, and only the indoor fan is operated at low capacity, and when the operation is stopped, both the compressor and the indoor fan are turned off.

[0007]

[Problem to be Solved by the Invention] However, in the capacity switching control of the conventional air conditioner described above, the opening of the door,
Even when the indoor load is large, such as when the amount of solar radiation is large or when an indoor heater (heater, gas combustor, etc.) is used, the capacity changes from strong to medium or from medium to weak depending on the indoor air temperature T. As a result, the capacity will be reduced despite the large load, which may make it difficult to further reduce the indoor air temperature T to reach the set temperature Ts, and the capacity will be increased. When switching from medium to medium, or from medium to low, the capacity is reduced, so the indoor air temperature T rises due to the indoor load, and the capacity is switched from medium to high, or from low to medium, and from high to medium, or from low to medium. There was a problem in that the indoor air temperature T was difficult to reach the set temperature Ts because the capacity was only switched alternately between medium and low.

[0008] An object of the present invention is to provide a method for controlling an air conditioner that can quickly reach a set temperature regardless of the magnitude of the load in the room.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the air conditioner control method of the present invention detects the indoor air temperature T at fixed time intervals Δθ, and compares the previously detected indoor air temperature TA with the air conditioner control method of the present invention. The temperature change rate V at that point is calculated by dividing the difference Δt by the time interval Δθ, and the required operating time Θ required to reach the set temperature Ts at the calculated temperature change rate V is calculated. set temperature T
Multiple set operating times τ1, τ2 until reaching s
,...,τn (τ1 >τ2 >...>τn)
(n is a natural number), these multiple set operating times τ1
, τ2 ,..., τn, the required operating time Θ
By selecting and switching the operating capacity depending on the location of the room, the set temperature can be quickly and reliably reached regardless of the size of the load in the room.

0010

[Embodiment] An embodiment of the present invention will be explained based on the flowchart of FIG.
θ (for example, at 1-minute intervals), and by dividing the difference Δt (Δt=T−TA) from the previously detected indoor air temperature TA by the time interval Δθ, the temperature change rate V (V=Δt /Δθ) is calculated, and the required operating time Θ [Θ=(Ts −T)/V] required to reach the set temperature Ts at the calculated temperature change rate V is calculated.

[0011] In advance, a plurality of set operating times τ1, τ2, . . . are set as the operating time until the set temperature Ts is reached.
, τn (τ1 > τ2 >...>τn) (n is a natural number), and set operating time τm (1≦m≦
The operating ability is set to a plurality of stages (for example, strong, medium, weak, blowing air, and stop) in correspondence with the time range determined by n).

Compare the required operating time Θ calculated above with the set operating time τm, determine which set operating time τm the required operating time Θ is in, and determine which set operating time τm falls within the time range defined by the set operating time τm. This will switch to the driving ability that corresponds to the time range.

In this embodiment, n=4, and the set operating times τ1, τ2, τ3, τ4 (τ1 >
τ2 > τ3 = 0 > τ4),
The set operating time τ3 = 0 means that the time to reach the set temperature Ts is zero, that is, the set temperature Ts has been reached, and the set operating time τ4 < 0 means that the set temperature Ts has been exceeded (during cooling operation, the time to reach the set temperature Ts has not reached the set temperature Ts). In this state, the indoor air temperature T is at or above the set temperature Ts during the heating operation.

[0014] Here, the above-mentioned required operating time Θ is compared with the set operating times τ1, τ2, τ3, τ4, and if the required operating time Θ is Θ≧τ1, the required operating time Θ to reach the set temperature Ts is determined. is long and the difference Δt between the indoor air temperature T and the set temperature Ts at that point is large, or the temperature change rate V at that point is small, that is, the indoor air conditioning load is large. The harmonizer operates with high capacity.

[0015] If the required operating time Θ is τ1 > Θ≧τ2, the required operating time Θ has become shortened to some extent, and the difference Δt between the indoor air temperature T and the set temperature Ts at that point has become small, or This is a case where the temperature change rate V at that point is large, that is, the indoor air conditioning load is small.
The capacity of the air conditioner can be switched inside.

[0016] The required operating time Θ is τ2 >Θ≧τ3 (τ
3=0), the indoor air temperature T and the set temperature Ts
In this case, the indoor air temperature T will soon reach the set temperature Ts because the difference Δt between the two and can be switched to

[0017] The required operating time Θ is τ3 >Θ≧τ4 (τ
3=0, τ4 <0), this means that the indoor air temperature T matches the set temperature Ts or is slightly overshooting, and the capacity of the air conditioner is switched to blowing operation.

Furthermore, the required operating time Θ is Θ<τ4 (τ
4 <0), the indoor air temperature T is equal to the set temperature Ts
Since the air conditioner is in an overshoot state, the air conditioner is stopped.

As described above, the air conditioner control method of the present invention predicts the operating time Θ required for the indoor air temperature T to reach the set temperature Ts, and calculates the operating time Θ based on this predicted required operating time Θ. Since the operating capacity of the air conditioner is controlled, it is possible to ensure that the indoor air temperature T reaches the set temperature Ts, and the maximum value (
Here, by reducing τ1), the air conditioner can be operated at high capacity for a longer period of time, and the time required for the indoor air temperature T to reach the set temperature Ts can be shortened.

[0020] Also, the maximum value (τ1
), the operating characteristics of the air conditioner can be easily changed by changing the maximum set operating time (
If τ1) is made small, rapid automatic control will be performed, while if the maximum set operating time (τ1) is made large, gradual automatic control will be performed.

[Effects of the Invention] As described above, according to the air conditioner control method of the present invention, the operating time required for the indoor air temperature to reach the set temperature is predicted, and the predicted required operating time is set in advance. Since the operating capacity of the air conditioner is controlled by comparing it with the set operating time, it is possible to ensure that the indoor air temperature reaches the set temperature, and by reducing the maximum value of the set operating time, The increased capacity allows the air conditioner to run longer and shorten the time it takes for the indoor air temperature to reach the set temperature. In addition, by changing the maximum value of the set operating time, the operating characteristics of the air conditioner can be easily changed. When the set operating time is increased, gradual automatic control is performed.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the operation of the air conditioner control method of the present invention.

FIG. 2 is a schematic configuration diagram of a refrigeration cycle of a normal air conditioner.

FIG. 3 is a control characteristic diagram according to a conventional control method.

[Explanation of symbols]

1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Capillary tube 5 Check valve 6 Capillary tube 8 Accumulator 9 Liquid side piping 10 Gas side piping 11 Indoor heat exchanger

Claims (1)

[Claims] [Claim 1] Detect the indoor air temperature at regular time intervals, calculate the temperature change rate at that point, calculate the required operating time required to reach the set temperature at the calculated temperature change rate, and set it in advance. A control method for an air conditioner, characterized in that the operating capacity is selected and switched depending on which range of the plurality of set operating times the required operating time falls in, compared with the set operating time until reaching the plurality of set temperatures. .