A measuring method and measuring circuit for pt1000 temperature sensor
A temperature sensor and measurement circuit technology, applied in the direction of temperature measurement, heat measurement, thermometer application in motors, etc., can solve the problem of temperature measurement error increase, and achieve the effect of simplifying circuit design
Active Publication Date: 2018-09-11
HENAN DIESEL ENGINE IND
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The matching sensor measurement circuit is also an important link that affects the measurement accuracy and other factors. At present, the detection circuit of PT1000 and PT100 platinum resistance temperature sensors mostly adopts the method of Whiston bridge sampling and operation amplification and then A / D conversion. The error between the design value and the actual value of the power supply voltage of the mode bridge and the reference voltage of the A / D converter will cause the temperature measurement error to increase
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[0050] The present invention is described in conjunction with accompanying drawing and specific embodiment:
[0051] Such as figure 1 , 2As shown, a measurement circuit for PT1000 temperature sensor, including: system external temperature sensor PT1000 acquisition input circuit Part_A, 8 selection 1 multiplexing electronic switch circuit and precision operational amplifier, the 8 selection 1 multiplexing The input terminal Sa-Sb of the electronic switch circuit is connected to the output terminal of the acquisition input circuit Part_A of the external temperature sensor PT1000 of the system; the output terminal Da-Db of the 8-choice 1 multiplexing electronic switch circuit is connected to the input terminal of the precision operational amplifier.
[0052] The acquisition and input circuit Part_A of the external temperature sensor PT1000 of the system is composed of a temperature sensor PT1000 electrically connected with a resistance-capacitance filter circuit.
[0053] The 8...
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The invention belongs to the technical field of diesel engine monitoring, and discloses a measurement method and a measurement circuit for a PT1000 temperature sensor. The circuit involved in the method comprises an external system temperature sensor acquisition input circuit Part_A, an 8-to-1 multiplexing electronic switching circuit and a precision operational amplifier, wherein the input end Sa-Sb of the 8-to-1 multiplexing electronic switching circuit is connected with the output end of the external system temperature sensor acquisition input circuit Part_A; and the output end Da-Db of the 8-to-1 multiplexing electronic switching circuit is connected with the input end of the precision operational amplifier. According to the measurement method and the measurement circuit, the problem of an error in temperature measurement due to a difference between design values and actual values of power supply voltage of the sensor and reference voltage of an A / D converter is solved; the error can be controlled within + / - 1 DEG C within the temperature measurement range of 0 to 200 DEG C, so that the requirement of a diesel engine monitoring system on the measurement precision of a temperature signal of such media as cooling water and lubricating oil can be met, and the circuit design is simplified.
Description
technical field [0001] The invention belongs to the technical field of diesel engine monitoring. It mainly relates to a measurement method and a measurement circuit for a PT1000 temperature sensor used for measuring medium temperature signals such as diesel engine cooling water, lubricating oil, and intake air. The invention can also be popularized and applied to monitoring systems of other power equipment. Background technique [0002] Temperature signal measurement is a commonly used technical means in industrial automation control. The types of temperature sensors selected vary according to factors such as application occasions, temperature measurement range, accuracy requirements, application costs, and diesel engine power levels. At present, the temperature sensors commonly used in diesel engine monitoring include Cu50, PT100, PT1000, etc., and there are certain differences in their working characteristics, manufacturing process, and cost. Compared with Cu50 sensor, PT...
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IPC IPC(8): G01K7/21
CPCG01K7/21G01K2205/00G01K2205/02G01K2219/00
Inventor 杨迅
Owner HENAN DIESEL ENGINE IND