KR960013869B1 - Crockerys volume feeler method and devices in washing machine for crockery - Google Patents

Abstract

The method and apparatus measures the quantity of dishes by multiple stages, and makes possible setting of washing conditions such as a washing or a rinsing time according to the quantity of dishes. The method includes measuring a time necessary to reach a reference temperature by driving a heater and a washing motor after finishing the supply of the washing water; comparing the measured time with references. If the time is under a 1st reference time, the quantity is determined as small, if between the 1st and 2nd reference time, as medium and if over the 2nd reference time, as large.

Description

Dish quantity detection method and device of dish washing dryer

1 is an internal block diagram of a general dish washing dryer.

2 is the administrative progress of a typical dish washing dryer.

3 is a block diagram of a tableware amount sensing device of the dish washing machine according to the present invention.

4 and 5 are diagrams showing the rate of temperature rise according to the amount of dishes and voltage.

Figure 6 is a flow chart for performing a dish amount detection method of the dish washing dryer according to the present invention.

7 is (a)-(c) is a voltage waveform diagram of each part of FIG.

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: display unit

3: power supply unit 4: load driving unit

5: temperature sensing unit 6: voltage sensing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dish washer dryer, and more particularly, to a method and apparatus for detecting a dish amount of a dish washer dryer, which detects the amount of dishes in multiple stages and sets washing conditions such as washing and rinsing time according to the amount of dishes.

1 shows an internal block diagram of a general dish washing dryer, and includes a microcomputer 1 for overall control of the system, a display unit 2 for displaying the progress of each stroke, the microcomputer 1, and other circuits. It is composed of a power supply unit (3) for supplying the necessary power, a load driving unit (4) for driving each load such as a heater or a motor, a temperature sensing unit (5) for detecting the water temperature during heating, 5) is composed of a temperature sensor TH, a current limiting resistor R1, and a voltage distribution resistor R2.

And the administrative progress in the dish washing dryer of this configuration is as shown in Figure 2, the water supply and drainage administration, the preliminary washing to wash and rinse with watered water, the rinse 1, 2, heated water to wash and It consists of a main rinse for rinsing, a heating rinse, and the like, and the required load is controlled by the microcomputer 1 in accordance with the progress of this stroke.

In other words, the water supply and drainage strokes up to the set water level and drains until all the water in the tub is drained. The pre-washing and rinsing 1 and 2 strokes spray the supplied water through the nozzle by driving the washing motor. Rinsing and rinsing are carried out and the stroke is carried out only for a fixed time.

The main washing process is to heat the water by driving the heater and the washing motor, and to spray the water at the same time to proceed with the washing with hot water, in which case the stroke is carried out until reaching a predetermined time and a predetermined temperature. At this time, the water temperature is detected by the temperature sensor (TH) of the temperature sensor (5).

In addition, heat rinsing, like the main washing, drives the heater to heat water, drives the washing motor, and sprays hot water to rinse the rinsing, and this process is performed until reaching a predetermined time and a predetermined temperature.

Therefore, the prior art as described above always proceeded each stroke for a predetermined time according to the set administrative progress, accordingly, the operation is always performed under the same conditions irrespective of the amount of dishes, so if there are many dishes, the washing is inadequate and there are few dishes. In this case, there was a problem in that over-washing consumes more time and power than necessary.

The present invention is to solve this problem, an object of the present invention is to detect the amount of tableware in multiple stages by measuring the time to reach the set temperature using the principle that the rate of increase in water temperature according to the power supply voltage and the amount of tableware The present invention provides a method and apparatus for detecting the amount of dishware in a dish washing dryer so that suitable washing conditions can be set according to skill.

In order to achieve the above object, the present invention provides a method for detecting a dish amount of a dish washing dryer, wherein a time for reaching a preset temperature by pre-executing a heater drive or driving a washing motor together with a heater drive after water supply is completed up to a set level. The amount of the dish in the dish washing dryer detects the amount of the dish in multiple stages by comparing the measured time with the reference time.

According to another aspect of the present invention, a dish washing dryer includes a temperature sensing unit for detecting a water temperature during heating, and comparing the amount of dishware to a multi-step by comparing a large and small value between a set temperature reaching time and a preset reference time by driving a washing motor. And a voltage sensing unit configured to detect a microcomputer and a power supply voltage supplied to the microcomputer so that the microcomputer can organically determine the amount of dishes according to the detected voltage. .

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram of a dish amount sensing device of the dish washing dryer according to the present invention. The voltage sensing unit 6 for sensing the power supply voltage supplied to the microcomputer 1 in the conventional apparatus of FIG. It is further provided, and the same reference numerals are used for the same parts as in the prior art.

The voltage sensing unit 6 is connected in parallel to a resistor R3 for voltage drop and the resistor R3, and a voltage divider resistor R4 for distributing an input voltage together with the resistor R3 and a voltage source. The cathode side is connected to (Vcc) and the anode side is connected to the resistors R3 and R4 to bypass the voltage D1, constant resistance (5V) or more, and the resistors R3 and R4. And a half-wave rectifying diode D2 having an anode side connected to the anode side of the diode D1, a smoothing capacitor C1, C2 connected in parallel to the diode D2, and a parallel to the capacitor C1. And a resistor R5 for discharging the voltage charged in the capacitors C1 and C2.

As described above, the principle of detecting the amount of dishware according to the present invention is as shown in FIGS. 4 and 5, the voltage is low and the heat generation amount of the heater is small, so that the water temperature will rise slowly. The more the more heat is lost to the tableware, the temperature of the water will rise slowly, and the less the tableware, the water temperature will rise quickly.

This first drives the required load of the microcomputer 1 in accordance with the administrative progress diagram of FIG.

In other words, the water supply and drainage process is to supply and drain water up to the set water level, the pre-cleaning is to wash the dishes by driving the washing motor for a set time. And the amount of tableware detection of the present invention is a method for measuring the time to reach the set temperature in the main washing section, which is to drive the heater and the washing motor after the water supply is completed in the main washing section according to the flow chart of FIG. Will be detected.

First, when the water temperature gradually increases and reaches the start temperature, time measurement is started. When the water temperature continues to increase due to the heating of the heater, the time measurement is stopped and the amount of dishes is determined.

At this time, the amount of dishes is determined in multiple stages by comparing the time from the start temperature to the set temperature and the set reference time.

That is, when the time t from the start temperature to the set temperature is smaller than the first reference time ref1, the amount of dishes is determined as a small amount, and the time t from the start temperature to the set temperature is the first reference time ref1. ) Is greater than or equal to and less than the second reference time (ref2), the amount of dishes is determined as an intermediate amount, and when the time (t) from the start temperature to the set temperature is greater than or equal to the second reference time (ref2), It is judged in large quantities. Here, the relationship between the second reference time ref2 and the first reference time ref1 is ref2ref1.

On the other hand, as shown in FIG. 4, since the rate of temperature rise is different according to the power supply voltage, the reference time to be set according to the voltage must also be different, and the detection of the power supply voltage is performed by the voltage detector 6.

That is, the power supply voltage as shown in FIG. 7A is distributed through the resistors R3 and R4, and the voltage drops through the resistor R3.

The voltage divided by the resistors R3 and R4, that is, the voltage of the node a (Fig. 7 (b)) is half-wave rectified through the diode D2, and the half-wave rectified voltage is converted into a capacitor ( C1) and C2 are smoothed as shown in FIG. 7C, and the microcomputer 1 reads the voltages charged in the capacitors C1 and C2 to determine the power supply voltage.

At this time, the amount of tableware is determined by changing the reference time according to the determined power supply voltage value, and the reference time according to the power supply voltage value is stored in the microcomputer 1 as a table. As described above, the present invention can set the appropriate washing conditions according to the amount of dishes by detecting the amount of dishes in multiple stages in consideration of the temperature rise rate according to the power supply voltage and the temperature rise rate according to the amount of dishes, thereby preventing over-washing or inadequate washing. This can reduce time or power consumption due to over-cleaning.

Claims (4)

In the dish washing method of the dish washing machine, after the water supply is completed up to the set level, the heater is pre-run or the washing motor is driven together with the heater to measure the time to reach the set temperature and compare the measured time with the reference time. The amount of tableware of the dish washing dryer, characterized in that for determining the amount of tableware in multiple stages. The method of claim 1, wherein when the time to reach the set temperature is less than the first reference time, a small amount of dishes is determined, and the time to reach the set temperature is greater than or equal to the first reference time and greater than the second reference time. And if the amount is small, determines that the amount of the dish is medium, and if the time to reach the set temperature is greater than or equal to the second reference time, the amount of the dish is determined as a large amount. In the dish washer dryer, a temperature sensing unit for detecting the water temperature during heating, the microcomputer to determine the amount of the dish in multiple stages by comparing the large and small of the set temperature reaching time by the washing motor drive and the preset reference time, and the And a voltage sensing unit configured to sense a power supply voltage supplied to the microcomputer and to organically determine the microcomputer amount of the microcomputer according to the sensed voltage value. 4. The voltage sensing device of claim 3, wherein the voltage sensing unit has a voltage drop connected to the first resistor in parallel with the first resistor, and a second resistor for voltage distribution for distributing the input voltage together with the first resistor, and a cathode at the voltage source. A half wave having a side connected, a first diode connected to the first and second resistors for bypassing a voltage higher than a predetermined voltage, and an anode side connected to the anode sides of the first and second resistors and a diode. A rectifying second diode, a smoothing first and second capacitor connected in parallel to the second diode, and a first capacitor for discharging a voltage charged in the first and second capacitors in parallel with the first capacitor. Dishwasher detection device of the dish washing dryer, characterized in that consisting of three resistors.