CN221173660U

CN221173660U - High-precision engine temperature acquisition device

Info

Publication number: CN221173660U
Application number: CN202323025073.XU
Authority: CN
Inventors: 高强; 王君阳
Original assignee: Shaanxi Qianshan Avionics Co Ltd
Current assignee: Shaanxi Qianshan Avionics Co Ltd
Priority date: 2023-11-09
Filing date: 2023-11-09
Publication date: 2024-06-18
Anticipated expiration: 2033-11-09

Abstract

The utility model relates to a high-precision engine temperature acquisition device which mainly comprises an instrument amplifier, a front end matching resistor, a filter capacitor, a thermistor, a front end constant current source, a reference source, an AD converter and a CPU. The instrument amplifier and the front end matching resistor and the filter capacitor of the instrument amplifier can collect millivolt-level voltage signals output by a thermocouple at the source end of the engine; the thermistor and the front constant current source can realize cold end compensation temperature acquisition of the high-precision engine temperature acquisition device; the reference source can be used for the CPU to carry out voltage acquisition error adjustment; all the voltage signals are sent to a CPU to realize calculation output after analog-to-digital conversion is completed by an AD converter. The utility model can improve the acquisition precision of the engine temperature and is used for improving the engineering application effect.

Description

High-precision engine temperature acquisition device

Technical Field

The utility model belongs to the technical field of avionics, and particularly relates to a high-precision engine temperature acquisition device.

Background

The engine is used as a core power component of the equipment, and the health condition of the engine is related to the integrity and usability of the equipment. Generally, a measurable engine temperature is selected in combination with engine speed or throttle conditions to provide an engine health assessment. Therefore, reliable and accurate engine temperature acquisition is particularly important.

Disclosure of utility model

The purpose of the utility model is that: the high-precision engine temperature acquisition device can improve the acquisition precision of the engine temperature and is used for improving the engineering application effect.

The technical scheme of the utility model is as follows: in order to achieve the above object, a high-precision engine temperature acquisition device is provided, which comprises an instrument amplifier and a front end matching resistor and a filter capacitor thereof, a thermistor and a front end constant current source thereof, a reference source, an AD converter and a central processing unit (Central Processing Unit, CPU for short); the instrument amplifier and its front end matching resistor and filter capacitor, the thermistor and its front end constant current source and reference source are respectively and electrically connected with AD converter, and the AD converter is connected with CPU by means of communication.

In one possible embodiment, the meter amplifier and its front-end matching resistor and filter capacitor can collect millivolt-level voltage signals output by the thermocouple at the source end of the engine.

In one possible embodiment, the thermistor and its front end constant current source enable cold end compensated temperature acquisition of the high precision engine temperature acquisition device.

In one possible embodiment, the reference source is used by the CPU for voltage acquisition error adjustment.

In one possible embodiment, all the voltage signals are sent to the CPU to realize calculation output after analog-to-digital conversion is completed by the AD converter.

In one possible embodiment, the CPU is configured to receive the digital signal from the AD converter, calculate the digital signal, and output the calculated digital signal.

In one possible embodiment, a high precision engine temperature acquisition device is applied to an engine apparatus employing a thermocouple to sense a difference in cold and hot end temperatures for potential output.

The utility model has the beneficial effects that: the utility model provides a high-precision engine temperature acquisition device, which can bring the following beneficial effects:

1. The method is not limited to a fixed hardware platform, and has a general popularization effect;

2. The temperature of engine equipment which adopts a thermocouple to induce the temperature difference of the cold end and the hot end to carry out potential output can be accurately collected and output;

the accurate acquisition of the engine temperature can assist a user to effectively evaluate the health of the engine by combining the states of the engine speed or the throttle and the like;

The accurate collection of the engine temperature can avoid misjudgment of the health state of the engine.

Drawings

FIG. 1 is a hardware platform framework of the present utility model.

The device comprises a 1-resistor, a 2-capacitor, a 3-instrumentation amplifier, a 4-constant current source, a 5-thermistor, a 6-reference source, a 7-AD converter and an 8-CPU.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model is not limited to a fixed hardware platform carrier, but should be provided with at least two parts, namely an acquisition interface circuit and a CPU circuit, see FIG. 1.

In FIG. 1, the 1-resistor and the 2-capacitor form an RC filter circuit, and together with the 3-instrumentation amplifier, form a millivolt signal acquisition circuit. The voltage output by the thermocouple is a millivolt signal of 0-100 mV, belongs to a weak signal and is easily influenced by a back-end circuit, and in order to avoid interference, a front-end amplification mode is adopted by an instrument amplifier.

In fig. 1, a 4-constant current source and a 5-thermistor form a cold end temperature output circuit. The 4-constant current source outputs constant current to the 5-thermistor, and the characteristic of the 5-thermistor is that the resistance of the 5-thermistor changes along with the change of the ambient temperature, so that the voltage related to the change of the ambient temperature is output to the back-end circuit.

In fig. 1, a 6-reference source is used to generate a reference voltage source that is provided to a 7-AD converter. In general, a dedicated reference voltage source can obtain higher precision than a reference source built in an A/D converter, so that the 7-AD converter can ensure higher precision.

In fig. 1, a 7-AD converter is used to convert the front-end voltage signal into a digital signal for output to an 8-CPU.

In fig. 1, the 8-CPU obtains the actual output value of the 6-reference source from the 7-AD converter, and calculates the compensation coefficient a from the actual output value and the theoretical output value of the 6-reference source. And 8-CPU performs compensation calculation and summation on the thermocouple output voltage and the cold end temperature output voltage according to the compensation coefficient a, and outputs the engine temperature corresponding to the voltage value to the outside according to the k graduation table.

The foregoing is merely a detailed description of the utility model, which is not a matter of routine skill in the art. However, the scope of the present utility model is not limited thereto, and any changes or substitutions that can be easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. The protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The high-precision engine temperature acquisition device is characterized by comprising an instrument amplifier, a front end matching resistor, a filter capacitor, a thermistor, a front end constant current source, a reference source, an AD converter and a CPU; the instrument amplifier and its front end matching resistor and filter capacitor, the thermistor and its front end constant current source and reference source are respectively and electrically connected with AD converter, and the AD converter is connected with CPU by means of communication.

2. The high-precision engine temperature acquisition device according to claim 1, wherein the instrument amplifier and the front end matching resistor and the filter capacitor thereof can acquire millivolt-level voltage signals output by a thermocouple at a source end of an engine.

3. The high-precision engine temperature acquisition device according to claim 2, wherein the thermistor and the front constant current source thereof realize cold end compensation temperature acquisition of the high-precision engine temperature acquisition device.

4. A high precision engine temperature acquisition device according to claim 3, wherein the reference source is used for voltage acquisition error adjustment by the CPU.

5. The high-precision engine temperature acquisition device according to claim 4, wherein all voltage signals are subjected to analog-to-digital conversion by the AD converter and then sent to the CPU to realize calculation output.

6. The high-precision engine temperature acquisition device according to claim 5, wherein the CPU is used for calculating and outputting after receiving the digital signal from the AD converter.