JPH05126650A - Temperature measuring device - Google Patents

Abstract

PURPOSE:To convert the detected value into proper temperature information by combining the inherent sensor identifying elements for each type of temperature sensors, judging the type with a judgment section, and calculating the temperature of the measured portion based on the sensor current and the type judged result with a temperature arithmetic section. CONSTITUTION:The voltage inherent to the type of thermistors 1A, 1B is outputted to sensor identifying output terminals Dc1, Dc2 by the combination of voltage-dividing resistors R2A, R3A or R2B, R3B of module sections 2A, 2B combined with the thermistors 1A, 1B. The voltage is fed to a judgment section 4 through a multiplexer 8 and an A/D converter 6. The conversion factor between the detected value and the actual temperature of the thermistors 1A, 1B is calculated from the voltage. A temperature arithmetic section 5 sets the conversion factor in response to each thermistor. When the temperature is changed, the voltage of temperature detecting output terminals Dt1, Dt2 is changed, and it is inputted to the arithmetic section 5 through a multiplexer 9 and an A/D converter 7. The arithmetic section 5 calculates the temperature of the measured portion with the preset conversion factor, and the temperature is displayed on a display section 10 in response to each thermistor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for measuring the temperatures of a plurality of portions to be measured by a plurality of temperature sensors.

[0002]

2. Description of the Related Art Conventionally, in this type of temperature measuring device, different types of temperature detecting elements are used as appropriate, but due to the different types of temperature detecting elements, the conversion between the detected value and the actual temperature is performed. Since the coefficients etc. are different, it was necessary to specify the type of temperature detection element to be applied in advance, or to input the information on the type to the temperature calculation unit when the temperature detection element was connected. .

[0003]

However, in the above-mentioned temperature measuring device, there is a possibility that information about the type of the temperature detecting element may be forgotten to be input or may be erroneously set.
There is a problem that the detected value is not converted into accurate temperature information.

An object of the present invention is to provide a temperature measuring device in which the type of connected temperature detecting element is discriminated and the detected value is converted into accurate temperature information.

[0005]

In order to solve the above-mentioned problems, the present invention provides a temperature sensor which is an electric element and changes the energization value between both ends of the element according to the temperature of the measured portion. A temperature sensor identification element that is an electrical element connected between both ends of the temperature sensor and that is related to the energization value and is a value unique to the type of each temperature sensor, and a temperature based on the energization value between both ends of the temperature sensor identification element. The temperature sensor includes a discriminating unit that discriminates the type of the sensor discriminating element, and a temperature calculating unit that calculates the temperature of the measured portion based on the value related to the energization value across the temperature sensor and the discrimination result of the discriminating unit.

[0006]

According to the present invention, the temperature sensor identification element having a unique value is combined with each temperature sensor for each type of temperature sensor, and the type of the temperature sensor is discriminated by the discriminating unit to calculate the temperature. The unit calculates the temperature of the measured portion based on the value related to the energization value of the temperature sensor and the determination result of the determination unit.

[0007]

1 is a block diagram of a temperature measuring apparatus showing an embodiment of the present invention.

Numerals 1A and 1B are thermistors as temperature sensors for detecting the temperature of the portion to be measured, and the resistances RtA and RtB between both ends change depending on the temperature. 2A and 2B are module parts used in combination with the thermistors 1A and 1B, and the DC control voltage Vcc terminal thereof is the thermistor 1A and 1B.
1B, the ground potential GND terminal is connected to the other ends of the thermistors 1A and 1B via voltage dividing resistors R1A and R1B to form a current path for temperature detection, and the Vcc terminal and GND. A voltage dividing resistor R2A, R3A or R2B,
R3B is connected to form a current path for identifying the temperature sensor. Dt1 and Dt2 are temperature detection output terminals for extracting the potentials at the other ends of the thermistors 1A and 1B, and Dc1 and DC2 are temperature sensor identification output terminals for extracting the potential at the connection point between the voltage dividing resistors R2A, R3A or R2B, R3B. is there. The resistors R2A, R3
A, R2B and R3B form temperature sensor identification elements, and the mutual ratio of their resistance values is set uniquely to the type of thermistors 1A and 1B.

Reference numeral 3 denotes a measuring device unit, a discriminating unit 4 for discriminating the type of a temperature sensor discriminating element by a common microcomputer, a temperature arithmetic unit 5 for computing the temperature of the measured portion, and a temperature sensor discriminating output. A / D voltage of terminals Dc1 and DC2
A / D converter 6 for conversion and temperature detection output terminals Dt1, D
A / D converter 7 for A / D converting the voltage of t2, and each A / D converter
Multiplexers 8 and 9 for switching and connecting the temperature sensor identification output terminals Dc1 and DC2 and the temperature detection output terminals Dt1 and Dt2 to the D converters 6 and 7 in real time, and the calculated receivers. It comprises a display unit 10 for displaying the temperature of the measuring unit and a power supply unit 11 for supplying the power supply voltage and the control voltage Vcc of each of these units.

Next, the operation of the above configuration will be described.

The voltage dividing resistors R2A, R3A or R of the module parts 2A, 2B which form a pair with the thermistors 1A, 1B.
Depending on the combination of 2B and R3B, the temperature sensor identification output terminal Dc1,
A voltage specific to the type of the thermistor 1A or 1B is output to DC2. The respective voltages are sequentially sent out in real time to the A / D converter 6 by the multiplexer 8, converted into digital values and given to the discriminating section 4. The discriminating section 4 calculates conversion factors of the detected value corresponding to the thermistor 1A or 1B and the actual temperature from the respective voltages. The temperature calculator 5 receives the conversion coefficient and sets the conversion coefficient corresponding to the type of each thermistor 1A or 1B. When the temperature of the portion to be measured changes, the resistances RtA and RtB across the thermistors 1A and 1B change, and the voltages at the temperature detection output terminals Dt1 and Dt2 change accordingly. Each of the voltages is sequentially A by the multiplexer 9 in real time.
It is sent to the / D converter 7, converted into a digital value, and given to the temperature calculation unit 5. The temperature calculation unit 5 calculates the temperature of the measured portion based on the respective voltages and the respective conversion factors set previously. The temperature is displayed on the display unit 10 in association with each thermistor 1A, 1B.

When the temperature measuring device of this embodiment is applied to the temperature control of refrigeration equipment, for example, the assembly of the temperature sensor (thermistor 1A or 1B etc.) and the module part 2A or 2B etc. is condensed. Refrigerant inlet, evaporator refrigerant inlet,
Since it is necessary to attach to many parts such as the refrigerant outlet of the evaporator, the number of the assembly becomes large. Even in such applications, connect these assemblies to the multiplexers 8 and 9,
Similarly, it is dealt with by sequentially performing and displaying each operation in real time.

[0013]

As described above, according to the present invention, a temperature sensor identification element having a unique value for each type of temperature sensor is combined with each temperature sensor, and the discriminating section determines whether the temperature sensor is used. Since the type is determined and the temperature of the measured portion is calculated based on the detection value of the temperature sensor and the determination result of the determination unit, the detected value is calculated according to the type of the connected temperature detection element. Converted to appropriate temperature information.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature measuring device showing an embodiment of the present invention.

[Explanation of symbols]

1A, 1B ... Thermistor, 2A, 2B ... Module part,
4 ... Judgment part, 5 ... Temperature calculation part, 6, 7 ... A / D converter,
R2A, R3A, R2B, R3B ... Dividing resistors.

Claims (1)

[Claims] 1. A temperature sensor which forms an electrical element and changes an energization value between both ends of the element according to a temperature of a measured portion, and an electrical element connected between both ends of the temperature sensor and related to the energization value. That is, the temperature sensor identification element having a value unique to the type of each temperature sensor, a determination unit that determines the type of the temperature sensor identification element based on the energization value between both ends of the temperature sensor identification element, and the temperature sensor A temperature measuring device comprising: a temperature calculation unit that calculates a temperature of a measured part based on a value related to an energization value between both ends and a determination result of the determination unit.