Engine rotating speed processing device

Abstract

The invention relates to an engine rotating speed processing device, which belongs to the technical field of rotating speed acquisition and processing, and comprises a frequency division amplifier, the frequency division amplifier amplifies and shapes a rotating speed signal into a square wave and simultaneously can divide the signal into frequency according to a proportion, and the rotating speed signal is divided into two parts after being processed and is output to a controller for use. According to the invention, the digital logic circuit is adopted to collect the input rotating speed and divide the collected rotating speed into two parts, so that different control systems can obtain the same rotating speed signal, and the redundancy control is more reliable; and meanwhile, the collected rotating speed signal is processed into a 4-20mA signal for on-site display or upper computer display.

Description

Technical Field

[0001] The invention relates to an engine speed control technology, belongs to the technical field of speed acquisition and processing, and in particular to an engine speed processing device. Background Art

[0002] With the continuous development of science and technology, engine control systems are increasingly used in the fields of automobiles, aviation, ships, etc. In these control systems, the speed sensor plays a vital role. It can monitor the engine speed in real time and provide accurate speed signals to the controller. However, due to the large speed differences between engines with different numbers of teeth, how to accurately and efficiently process the speed signal has become a technical problem.

[0003] Existing speed signal processing devices have certain limitations, such as the inability to simultaneously process signals collected by magnetoelectric speed sensors and Hall speed sensors, and insufficient flexibility in signal amplification / scaling. This results in errors in the output speed signal and 4-20mA signal in actual applications, affecting the control effect of the engine. Summary of the invention

[0004] The purpose of the present invention is to provide an engine speed processing device which has the advantages of simple structure, stable performance, convenient adjustment, etc. and is expected to be widely used in the field of engine control.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides an engine speed processing device, including a frequency division amplifier, which amplifies the speed signal into a square wave and can divide the signal proportionally. After processing, the speed signal is divided into two and output to the controller for use.

[0006] Preferably, the frequency division amplifier can process a sine wave frequency signal and a square wave frequency signal.

[0007] Preferably, the frequency division amplifier can proportionally amplify or reduce the generated square wave frequency signal by 3 or 5 times.

[0008] Preferably, the frequency division amplifier can be adjusted by an internal dial to stabilize the output speed signal and the output 4-20mA signal.

[0009] Preferably, the signal received by the frequency dividing amplifier is amplified by an operational amplifier and then enters the voltage leveling module to convert the frequency signal into a voltage signal.

[0010] Preferably, the operational amplifier can process a minimum 30mV sine wave signal and convert it into a stable 15V square wave.

[0011] Preferably, it also includes a voltage leveling module, and the signal processed by the operational amplifier enters the voltage leveling module to convert the frequency signal into a voltage signal.

[0012] Preferably, a resistor network is also included to amplify or reduce the voltage signal to adjust the speed signal.

[0013] Preferably, the current adjustment range is from 4mA to 20mA, where 4mA corresponds to the lowest frequency 0Hz and 20mA corresponds to the highest frequency 1500Hz.

[0014] Preferably, the adjusted signal is transmitted to the speed governor, which scales down or amplifies the signal as needed to ensure the accuracy and stability of the engine speed.

[0015] In summary, the present invention includes the following beneficial technical effects:

[0016] The speed processing device of the present invention can process the magnetoelectric speed sensor (sine wave frequency signal) and the Hall speed sensor (square wave frequency signal) at the same time, which improves the versatility of the device. Through the frequency division amplifier, the device can realize the proportional amplification / reduction of the signal by 3 or 5 times, meeting the processing requirements of different engine speed signals. The internal dial is used for frequency division adjustment, which is simple to operate and suitable for engines with different numbers of teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an engine speed processing device of the present invention;

[0018] Figure 2 It is a partial schematic diagram of a frequency division amplifier in an engine speed processing device of the present invention;

[0019] Figure 3 Another partial schematic diagram of a frequency division amplifier in an engine speed processing device of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] An embodiment of the present invention discloses an engine speed processing device, which includes a frequency division amplifier.

[0022] The speed sensor inputs the collected speed signal into the speed processing device, which amplifies the speed signal into a square wave through a frequency division amplifier and can reduce the signal proportionally (frequency division). After processing, the speed signal is divided into two and output to the controller for use.

[0023] Specifically, the speed processing device can process the signals collected by the magnetoelectric speed sensor (sine wave frequency signal) and the Hall speed sensor (square wave frequency signal), and can also proportionally amplify / reduce the generated square wave frequency signal by 3 or 5 times. The frequency division can be adjusted by the internal dial, and after adjustment, it can be applied to engines with different numbers of teeth. The output speed is controlled within a more accurate range through the frequency division to ensure that the output speed signal and the output 4-20mA signal are more accurate.

[0024] The frequency signal after frequency division is processed by hardware and outputs two identical frequency signals. At the same time, it is processed and outputs a 4-20mA signal for speed display. The signal can be adjusted through two sliding resistors to adjust the speed range to match the tachometer or host computer.

[0025] Reference Figure 2 and Figure 3 , the speed signal output by the speed sensor at B is first amplified by the operational amplifier IC1C and then output through ports K and M. The system can process a sine wave signal as low as 30mV and convert it into a stable 15V square wave to ensure that the output signal of ports K and M is more stable.

[0026] The signals output from the K and M ports then enter the voltage leveling module, which converts the frequency signal into a voltage signal. Then, through the design of the resistor network, the voltage signal is appropriately amplified or reduced to achieve the adjustment of the speed signal. In this way, a suitable frequency band speed signal can be provided for equipment such as the engine controller, and the frequency range is 0 to 1500Hz.

[0027] The PUL signal is obtained by processing the signal output from the K terminal. The signal is adjusted to a suitable frequency range, generally 0-1500Hz. This processed signal is used to adjust the output signal of J7.1 through resistors P7 and P8.

[0028] Specifically, resistors P7 and P8 are used to adjust the current of the output signal to match the corresponding frequency width. The current adjustment range is from 4mA to 20mA, where 4mA corresponds to the lowest frequency 0Hz and 20mA corresponds to the highest frequency 1500Hz. This design allows the system to output the corresponding current signal according to the change of frequency, thereby achieving precise control.

[0029] Finally, these adjusted signals are sent to the speed governor, which scales down or amplifies the signals as needed to ensure accurate and stable engine speed.

[0030] The invention realizes the speed division into two parts, solves the technical problem of the redundancy of the speed signal, and realizes the speed redundancy of the dual controller without changing the number of speed sensors. The invention adopts pure hardware construction, which is more reliable, and has frequency division adjustment to adapt to engines with different numbers of teeth, so that the output speed is more accurate.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine speed processing device, characterized in that: It includes a frequency division amplifier, which amplifies the speed signal into a square wave and divides the signal proportionally. After processing, the speed signal is divided into two and output to the controller for use.

2. The engine speed processing device according to claim 1, characterized in that: The frequency divider amplifier can process both sine wave frequency signals and square wave frequency signals.

3. The engine speed processing device according to claim 2, characterized in that: The frequency division amplifier can amplify or reduce the generated square wave frequency signal by 3 or 5 times in equal proportion.

4. The engine speed processing device according to claim 3, characterized in that: The frequency divider amplifier can be adjusted through the internal dial to stabilize the output speed signal and the output 4-20mA signal.

5. The engine speed processing device according to claim 4, characterized in that: The signal received by the frequency divider amplifier is amplified by the operational amplifier and then enters the voltage leveling module to convert the frequency signal into a voltage signal.

6. The engine speed processing device according to claim 5, characterized in that: The operational amplifier can process a minimum 30mV sine wave signal and convert it into a stable 15V square wave.

7. The engine speed processing device according to claim 6, characterized in that: It also includes a voltage leveling module. The signal processed by the operational amplifier enters the voltage leveling module to convert the frequency signal into a voltage signal.

8. The engine speed processing device according to claim 7, characterized in that: It also includes a resistor network to amplify or reduce the voltage signal to achieve the adjustment of the speed signal.

9. The engine speed processing device according to claim 8, characterized in that: The current adjustment range is from 4mA to 20mA, where 4mA corresponds to the lowest frequency 0Hz and 20mA corresponds to the highest frequency 1500Hz.

10. The engine speed processing device according to claim 9, characterized in that: The adjusted signal is sent to the speed governor, which scales down or amplifies the signal as needed to ensure accurate and stable engine speed.

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