阅读说明：本技术 一种基于标准电磁阀和示波器的电流参数校准系统及方法 (Current parameter calibration system and method based on standard electromagnetic valve and oscilloscope ) 是由 孙新新 张建斌 张琪 于 2020-05-13 设计创作，主要内容包括：本发明涉及一种电流参数的校准系统与方法,特别是一种基于标准电磁阀和示波器的电流参数校准系统及方法。实现了专测设备的准确校准,设备上电后,专测设备、标准电磁阀、采样电阻、程控电源形成闭合回路,采样电阻上的电流即为标准电磁阀电流。通过示波器采集采样电阻两端的电压,得到电压曲线；根据欧姆定律,计算得到电流曲线,通过分析,得到稳态电流值,即为标准电流,和被测电流值进行对比,实现校准。(The invention relates to a current parameter calibration system and method, in particular to a current parameter calibration system and method based on a standard electromagnetic valve and an oscilloscope. Accurate calibration of the special equipment is achieved, after the equipment is powered on, the special equipment, the standard electromagnetic valve, the sampling resistor and the program control power supply form a closed loop, and the current on the sampling resistor is the current of the standard electromagnetic valve. Collecting voltages at two ends of the sampling resistor through an oscilloscope to obtain a voltage curve; according to ohm's law, a current curve is obtained by calculation, a steady-state current value, namely a standard current, is obtained by analysis, and is compared with a measured current value to realize calibration.)

1. The utility model provides a current parameter calibration system based on standard solenoid valve and oscilloscope which characterized in that: the device comprises a standard electromagnetic valve, a sampling resistor, a program-controlled power supply, a calibration cable, an oscilloscope and a GPIB controller;

the program control power supply, the special equipment to be calibrated, the calibration cable, the standard electromagnetic valve and the sampling resistor are sequentially connected to form a closed loop; the standard electromagnetic valve is an electromagnetic valve actually tested by the special equipment to be calibrated;

the calibration cable is a multi-core cable, and the number of cores corresponds to the number of channels of the special equipment to be calibrated;

the oscilloscopes are connected in parallel at two ends of the sampling resistor and are used for collecting voltage waveforms at two ends of the sampling resistor;

and the GPIB controller is respectively connected with the oscilloscope and the programmable power supply.

2. The standard solenoid and oscilloscope-based current parameter calibration system according to claim 1, wherein: one cable core of the calibration cable is a common cable core, one end of a sampling resistor is connected with the standard electromagnetic valve, and the other end of the sampling resistor is connected with one end of the common cable core;

the other end of the common cable core is connected with the negative end of the program-controlled power supply through the negative end of each calibration channel;

one end of each of the other cable cores can be connected with the positive end of the programmable power supply through the positive end of each channel; the other ends of the remaining cable cores can be connected with standard solenoid valves.

3. The standard solenoid and oscilloscope based current parameter calibration system according to claim 2, wherein: the sampling resistor is a precision resistor.

4. A method for realizing calibration by using the current parameter calibration system based on the standard solenoid valve and the oscilloscope as described in any one of claims 1 to 3, which is characterized by comprising the following steps:

step one, initialization

Controlling an oscilloscope to initialize; controlling the programmable power supply to output the required voltage;

step two, data acquisition

Acquiring voltage values at two ends of the sampling resistor by using an oscilloscope to obtain a voltage curve and storing the voltage curve;

step three, data processing

Step 3.1, processing the obtained voltage curve, and calculating according to an ohm law to obtain a corresponding current curve; analyzing according to the current curve to obtain time information and a standard current steady-state value;

and 3.2, comparing the steady state value of the standard current with the measured value displayed by the special equipment to be calibrated to realize calibration.

5. The method of calibration according to claim 4, wherein: the required voltage is 28V.

Technical Field

The invention relates to a current parameter calibration system and a method, in particular to a current parameter calibration system based on a standard electromagnetic valve and an oscilloscope.

Background

With the development of missile and carrier rocket technology, the requirements on lightening, quick response and high reliability of an electromagnetic valve for controlling the opening and closing of an engine are more and more outstanding. The bullet/arrow power system realizes multiple times of starting of the engine by means of multiple times of opening and closing of the electromagnetic valve, and the success or failure and performance level of the engine work are determined by the reliability and performance of the electromagnetic valve. The electromagnetic valve is extremely important in engines started for multiple times, particularly in attitude control engines, and repeated starting and pulse operation of the engine are realized just by adopting the electromagnetic valve. In order to ensure the reliability and performance of the electromagnetic valve, the steady-state current parameters of the electromagnetic valve need to be measured, the steady-state current parameters can be measured by using a satellite propulsion subsystem universal unit test device (for short, a special test device) developed by some research institute in the Shanghai, and the steady-state current parameters of the electromagnetic valve need to be calibrated before the device is used for measuring the steady-state current parameters of the electromagnetic valve.

However, since the current measuring module of the special-purpose equipment adopts the MOS transistor, the special-purpose equipment is damaged if a direct calibration method is adopted, and therefore, the calibration cannot be performed by adopting the direct calibration method.

Disclosure of Invention

In order to realize accurate calibration of the special equipment, the invention provides a current parameter calibration system based on a standard electromagnetic valve and an oscilloscope. After the equipment is electrified, the special equipment, the standard electromagnetic valve, the sampling resistor and the program control power supply form a closed loop, and the current on the sampling resistor is the current of the standard electromagnetic valve. Collecting voltages at two ends of the sampling resistor through an oscilloscope to obtain a voltage curve; according to ohm's law, a current curve is obtained by calculation, a steady-state current value, namely a standard current, is obtained by analysis, and is compared with a measured current value to realize calibration.

The technical scheme of the invention is to provide a current parameter calibration system based on a standard electromagnetic valve and an oscilloscope, which is characterized in that: the device comprises a standard electromagnetic valve, a sampling resistor, a program-controlled power supply, a calibration cable, an oscilloscope and a GPIB controller;

the program control power supply, the special equipment to be calibrated, the calibration cable, the standard electromagnetic valve and the sampling resistor are sequentially connected to form a closed loop; the standard electromagnetic valve is an electromagnetic valve actually tested by the special equipment to be calibrated;

the calibration cable is a multi-core cable, and the number of cores corresponds to the number of channels of the special equipment to be calibrated;

the oscilloscopes are connected in parallel at two ends of the sampling resistor and are used for collecting voltage waveforms at two ends of the sampling resistor;

and the GPIB controller is respectively connected with the oscilloscope and the programmable power supply.

Furthermore, one cable core of the calibration cable is a common cable core, one end of the sampling resistor is connected with the standard electromagnetic valve, and the other end of the sampling resistor is connected with one end of the common cable core;

the other end of the common cable core is connected with the negative end of the program-controlled power supply through the negative end of each calibration channel;

one end of each of the other cable cores can be connected with the positive end of the program-controlled power supply through the positive end of each channel; the other ends of the remaining cable cores can be connected with standard solenoid valves.

Further, the sampling resistor is a precision resistor.

The invention also provides a method for realizing calibration by using the current parameter calibration system based on the standard electromagnetic valve and the oscilloscope, which comprises the following steps:

step one, initialization

Controlling an oscilloscope to initialize; controlling the programmable power supply to output the required voltage;

step two, data acquisition

Acquiring voltage values at two ends of the sampling resistor by using an oscilloscope to obtain a voltage curve and storing the voltage curve;

step three, data processing

Step 3.1, processing the obtained voltage curve, and calculating according to an ohm law to obtain a corresponding current curve; analyzing according to the current curve to obtain time information and a standard current steady-state value;

and 3.2, comparing the steady state value of the standard current with the measured value displayed by the special equipment to be calibrated to realize calibration.

Further, the required voltage is 28V.

The invention has the beneficial effects that:

1. according to the invention, a standard electromagnetic valve and a sampling resistor are connected in series in a loop of special test equipment, the current of the standard electromagnetic valve is obtained by collecting the voltage at two ends of the sampling resistor, and the current of the standard electromagnetic valve is compared with the measured current value displayed on an upper computer, so that calibration is realized. The adopted standard electromagnetic valve is the electromagnetic valve actually tested by the special equipment, so that the current curve is not different from the actual working current curve; the circuit structure is simple, and the test process is convenient.

2. According to the invention, the standard electromagnetic valve is introduced into the calibration device, so that a current curve is finally obtained and is closer to an actual working current curve, and the calibration result is more accurate.

3. The sampling resistor adopted by the invention is a precision resistor, and has no influence on a current loop;

4. the current parameter calibration device is simple, feasible and effective in structure, can realize current parameter calibration only by providing a standard electromagnetic valve, a sampling resistor, an oscilloscope, a GPIB controller, a program control power supply, a special calibration cable, a computer and upper computer software, and has popularization value.

Drawings

FIG. 1 is a block diagram of a current parameter calibration system based on a standard solenoid valve and an oscilloscope according to the present invention.

Detailed Description

The following describes in detail the embodiments of the present invention, such as the components, the mutual positions and connection relationships between the respective parts, the functions and operation principles of the respective parts, with reference to the drawings and the embodiments.

As can be seen from fig. 1, the current parameter calibration system based on the standard electromagnetic valve and the oscilloscope in this embodiment mainly includes the standard electromagnetic valve, a sampling resistor, the oscilloscope, a GPIB controller, a program-controlled power supply, a dedicated calibration cable, a computer, and upper computer software. The special equipment to be calibrated comprises 50 sampling channels, the special calibration cable is a multi-core cable, the number of the cores of the multi-core cable corresponds to the number of the sampling channels, and one of the cores of the multi-core cable is a common core.

The program control power supply, the special equipment to be calibrated, the calibration cable, the standard electromagnetic valve and the sampling resistor are sequentially connected to form a closed loop; the specific loop is as follows: the positive end of programmable power supply can be connected with the one end of special calibration cable through the positive end of each sampling passageway that awaits measuring, and the other end of special calibration cable can be connected with standard solenoid valve, and standard solenoid valve is connected with sampling resistor one end, and sampling resistor's the other end is connected with the one end of public cable core, and the other end of public cable core is connected with the negative terminal of each sampling passageway, and the negative terminal and the programmable power supply negative terminal of each sampling passageway are connected.

The oscilloscopes are connected in parallel at two ends of the sampling resistor and are used for collecting voltage waveforms at the two ends of the sampling resistor;

the GPIB controller is used for controlling the communication between the computer and the program control power supply and the oscilloscope;

and the computer is used for sending a control instruction to the program-controlled power supply and the oscilloscope.

Sending an instruction to control the oscilloscope to initialize; and sending a command to control the programmable power supply to output the required voltage, wherein the voltage in the embodiment is 28V.

Controlling an oscilloscope to collect voltage values at two ends of the sampling resistor to obtain and store a voltage curve corresponding to a corresponding target point;

calling a data processing program, processing the obtained voltage curve, and calculating according to ohm's law to obtain a corresponding current curve; analyzing according to the current curve to obtain time information and a standard current steady-state value;

and comparing the standard current steady-state value with the measured current value of the special-purpose equipment to realize the calibration of the corresponding channel.

The special equipment comprises 50 sampling channels, and through the process, different sampling channels are connected into each loop, so that calibration of the 50 channels is sequentially realized, and finally calibration of the special equipment is realized.