CN103604953A - High-precision automobile diesel engine rotating speed instrument verification device - Google Patents

Abstract

The invention relates to a calibration device for a high-precision automobile diesel engine tachometer. The device is connected to the diesel engine tachometer. The calibration device includes a microprocessor subsystem and a diesel engine rotational speed signal simulation subsystem connected to each other. The diesel engine speed signal simulation subsystem is connected with the diesel engine tachometer; the microprocessor subsystem sends the control signal to the diesel engine speed signal simulation subsystem, and the diesel engine speed signal simulation subsystem generates a high-precision signal for simulating the operation of the diesel engine according to the control signal source, and provided to the diesel engine tachometer. Compared with the prior art, the present invention has the advantages of solving technical difficulties in calibrating diesel engine tachometers, realizing a fast, accurate and convenient calibrating process, and being affirmed and popularized for its excellent performance in practical applications.

Description

A calibration device for a high-precision automobile diesel engine tachometer

technical field

The invention relates to a calibration technology for a diesel engine tachometer, in particular to a calibration device for a high-precision automobile diesel engine tachometer.

Background technique

The application of diesel engines in the automotive field is very popular, and the number of uses is also very large. The diesel engine tachometer is the main instrument that reflects the current working state of the diesel engine. It directly monitors the operation of the diesel engine. The accuracy of the tachometer will affect the accurate judgment of the operating state of the diesel engine. Therefore, the calibration of the tachometer is a daily work.

With the rapid development of industrial technology, diesel engines have been widely popularized. Especially in driving devices and heavy-duty locomotives in extreme environments, diesel engines have become indispensable and important equipment. In order to use the diesel engine safely and effectively, an accurate diesel engine tachometer is a key link. In order to ensure the accuracy of the diesel engine tachometer, its calibration has become a top priority. The calibration instrument must first have a standard signal source. The signal provided must be very stable, high-precision, and easy to set the speed value. Otherwise, it will be impossible to calibrate the instrument, which brings difficulties to fast and effective calibration. .

Contents of the invention

The purpose of the present invention is to provide an automatic, visualized, and platform-based high-precision calibrating device for a diesel engine tachometer in order to overcome the above-mentioned defects in the prior art, which solves the technical difficulties in calibrating the diesel tachometer and realizes fast , accurate and convenient calibration process, has been affirmed and promoted with excellent performance in practical application.

The purpose of the present invention can be achieved through the following technical solutions:

A calibration device for a high-precision automotive diesel engine tachometer, the device is connected to the diesel engine tachometer, characterized in that the calibration device includes a interconnected microprocessor subsystem and a diesel engine rotational speed signal simulation subsystem, the The diesel engine speed signal simulation subsystem is connected with the diesel engine tachometer:

The microprocessor subsystem sends the control signal to the diesel engine speed signal simulation subsystem, and the diesel engine speed signal simulation subsystem generates a high-precision signal source for simulating the operation of the diesel engine according to the control signal, and provides it to the diesel engine tachometer.

The diesel engine speed signal simulation subsystem includes a frequency converter, a synchronous motor, a drive shaft, a cross roller and a test tube connected in sequence, the frequency converter is connected to the microprocessor subsystem, and the test tube is connected to the diesel engine tachometer connect;

The synchronous motor drives the cross roller to rotate through the transmission shaft, and the cross roller rotates and collides with the test tube, causing the test tube to generate micro vibrations to simulate the fuel injection state of the fuel injection pipe.

The frequency of the micro-vibration has a linear relationship with the rotational speed of the synchronous motor.

The rotational speed of the synchronous motor has a linear relationship with the output frequency of the frequency converter.

Described microprocessor subsystem comprises PIC microprocessor, LCD, RS485 interface, keyboard and power supply, and described PIC microprocessor is connected with LCD, RS485 interface, keyboard and power supply respectively, and described RS485 interface is connected with frequency converter connect.

The keyboard is used to set the working mode and the rotational speed value of the preset check.

The PIC microprocessor converts the preset speed value input by the keyboard into the frequency value corresponding to the frequency converter output, and the PIC microprocessor converts the frequency value into the current actual speed value and displays it on the LCD. It is synchronized with the The error of the running speed of the motor is more than a few ten-thousandths, which effectively eliminates the errors generated by calculation and quantification.

The diesel engine rotational speed signal simulation subsystem is fixed on the basic support, and the synchronous motor is fixed on the basic support through the synchronous motor support.

The basic bracket is a mountain-shaped structure, including a horizontal bracket and three vertical brackets fixed on the horizontal bracket, the transmission shaft and the test tube are installed on the vertical bracket, and the synchronous motor bracket is fixed on the horizontal bracket. on the stand.

Compared with the prior art, the present invention has the following advantages:

1. Use the synchronous motor to drive the wheel shaft and the connected knocking equipment to trigger the mechanical vibration of the metal oil pipe with the input frequency, and at the same time enable the diesel engine tachometer to accurately detect the vibration and simulate the speed measurement.

2. The AC voltage frequency output terminal of the inverter is connected to the voltage input terminal of the synchronous motor to control the input frequency of the synchronous motor. The effective cooperation of the two makes the speed adjustable and stable, and the operation accuracy is high.

3. The signal input terminal of the frequency converter is connected to the RS-485 port connected to the PIC microcontroller. The single chip microcomputer is used as the core of the control and measurement of the whole system, and the full digital interface technology is adopted to minimize the signal transmission error and monitor and feedback the state of the frequency converter in real time.

4. The input end of the PIC microcontroller is connected to the keyboard, and the output end is connected to the LCD screen to realize system visualization and real-time operation, and establish a friendly and perfect interactive platform.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural block diagram of the control part of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Fig. 1 and Fig. 2, a kind of calibration device of high-precision automobile diesel engine tachometer, this device is connected with diesel engine tachometer 6, and described calibration device comprises interconnected microprocessor subsystem and diesel engine speed signal The simulation subsystem, the diesel engine speed signal simulation subsystem is connected with the diesel engine tachometer 6; the microprocessor subsystem sends the control signal to the diesel engine speed signal simulation subsystem, and the diesel engine speed signal simulation subsystem according to the control signal An analog diesel engine running signal is generated and provided to the diesel engine tachometer 6 .

The diesel engine speed signal simulation subsystem includes a frequency converter 8, a synchronous motor 2, a transmission shaft 3, a cross roller 4 and a test tube 5 connected in sequence, and the frequency converter 8 is connected with the microprocessor subsystem, and the The test tube 5 is connected to the diesel engine tachometer 6; the synchronous motor 2 drives the cross roller 4 to rotate through the transmission shaft 3, and the cross roller 3 rotates and collides with the test tube 5, causing the test tube 5 to generate micro-vibrations for simulating fuel injection The injection status of the pipe. The frequency of the micro-vibration has a linear relationship with the rotational speed of the synchronous motor. The rotational speed of the synchronous motor has a linear relationship with the output frequency of the frequency converter.

The diesel engine rotational speed signal simulation subsystem is fixed on the base support 1, and the synchronous motor is fixed on the base support 1 through the synchronous motor support 7. The basic bracket 1 is a mountain-shaped structure, including a horizontal bracket and three vertical brackets fixed on the horizontal bracket, the transmission shaft and the test tube are installed on the vertical bracket, and the synchronous motor bracket 7 is fixed on the horizontal bracket.

Described microprocessor subsystem comprises PIC microprocessor 9, LCD11, RS485 interface, keyboard 10 and power supply, and described PIC microprocessor 9 is connected with LCD11, RS485 interface, keyboard 10 and power supply respectively, and described RS485 The interface is connected with the frequency converter. The keyboard is used to set the working mode and check the rotating speed value.

The PIC microprocessor 9 converts the rotational speed value input by the keyboard into a corresponding frequency value output by the frequency converter, and the synchronous motor then converts the frequency value into a rotational speed value.

The invention measures and verifies the accuracy of the automobile diesel engine rotational speed measuring instrument. In view of the principle of measuring the speed of the diesel engine tachometer, the diesel engine is replaced by simulating the operation of the diesel engine, and the analog signal provides the signal of the probe of the diesel engine speed measuring instrument. The simulated rotational speed has a computer-controlled digital output. The simulated rotational speed has the characteristics of very high accuracy, large range, and flexible rotational speed change. It is suitable for different types of instruments of this type.

There is a strict correspondence between the running speed of the synchronous motor and the output frequency of the inverter. Changing the frequency of the inverter means changing the running speed of the synchronous motor. The output power of the inverter is the power supply for the synchronous motor. Because the frequency accuracy of the output power of the frequency converter is very high and the stability is good, the microprocessor further compensates for the frequency accuracy, so a standard micro-vibration frequency source is obtained. The frequency converter outputs the corresponding power frequency according to the rotational speed value of the synchronous motor, and adjusts the voltage for torque compensation. The operation signal of the simulated diesel engine is generated through the mechanical structure. After rotating the cross roller, there is a micro-vibration between the test tube and the frequency of the vibration. The frequency of the vibration is strictly related to the speed of the synchronous motor. For the detection simulation, the free setting of the calibration range is realized, including the measurement and calculation of high-precision analog values, as well as the automation, visualization and platformization of this system. The invention solves the technical difficulty in calibrating the tachometer of the diesel engine, realizes a fast, accurate and convenient calibrating process, and has been affirmed and popularized for its excellent performance in practical application.

Claims (9)

1. the calibration equipment of a high precision diesel engine of vehicle rotational speed meters, this device is connected with diesel engine speed instrument, it is characterized in that, described calibration equipment comprises interconnective microprocessor subsystem and diesel engine speed signal imitation subsystem, and described diesel engine speed signal imitation subsystem is connected with diesel engine speed instrument:

Described microprocessor subsystem sends to diesel engine speed signal imitation subsystem by control signal, and this diesel engine speed signal imitation subsystem produces the high-precision signal source of simulation diesel engine running according to control signal, and offers diesel engine speed instrument.

2. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 1, it is characterized in that, described diesel engine speed signal imitation subsystem comprises frequency converter, synchronous motor, transmission shaft, cross roller and the testing tube connecting successively, described frequency converter is connected with microprocessor subsystem, and described testing tube is connected with diesel engine speed instrument:

Described synchronous motor drives cross roller to rotate by transmission shaft, and described cross roller rotary collision testing tube, makes testing tube produce the oil spout state that micro-vibration is used for simulating spray bar.

3. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 2, is characterized in that, the frequency of described micro-vibration and the rotating speed of synchronous motor are linear.

4. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 2, is characterized in that, the rotating speed of described synchronous motor and the output frequency of frequency converter are linear.

5. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 2, it is characterized in that, described microprocessor subsystem comprises PIC microprocessor, LCD, RS485 interface, keyboard and power supply, described PIC microprocessor is connected with power supply with LCD, RS485 interface, keyboard respectively, and described RS485 interface is connected with frequency converter.

6. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 5, is characterized in that, described keyboard is for setting the tachometer value of working method and initialize verification.

7. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 5, it is characterized in that, described PIC microprocessor converts frequency converter to according to the preset tachometer value of keyboard input and exports corresponding frequency values, PIC microprocessor converts this frequency values to the tachometer value of current reality again, be presented on LCD, the error of it and synchronous motor running speed ten thousand/several more than, effectively eliminate the error of calculating and quantizing to produce.

8. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 2, it is characterized in that, described diesel engine speed signal imitation subsystem is fixed on base rack, and described synchronous motor is fixed on base rack by synchronous motor support.

9. the calibration equipment of high precision diesel engine of vehicle rotational speed meters according to claim 8, it is characterized in that, described base rack is epsilon-type structure, comprise horizontal support and be fixed on three vertical supports on horizontal support, described transmission shaft and testing tube are installed in vertical supports, and described synchronous motor support is fixed on horizontal support.

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