阅读说明：本技术 一种柴油机转速信号前置放大装置 (Diesel engine rotating speed signal preamplification device ) 是由 李文辉 殷鹤祥 王忠巍 袁志国 李学民 霍天源 张仕麒 马贺 张鹏 于 2021-09-01 设计创作，主要内容包括：本发明的目的在于提供一种柴油机转速信号前置放大装置,包括电源模块、转速信号放大模块、转速信号整形模块、传感器测试信号模块,电源模块外接直流电信号,转速信号放大模块将安装在柴油机前端齿轮上的双绕组磁电式转速传感器输出的转速信号放大为幅值固定的转速信号,转速信号整形模块将转速信号放大模块输出的幅值固定的转速信号整形为波形规则的方波信号,并输出给转速信号应用装置,转速信号应用装置输出的传感器测试信号通过传感器测试信号放大电路进行功率放大。本发明将双绕组磁电式转速传感器输出的幅值较小的不规则转速信号,输出为幅值较大且固定的方波信号,使柴油机转速信号在传输的过程中能够有效的抗衰减和抗干扰,提高其信噪比。(The invention aims to provide a diesel engine rotating speed signal preamplification device which comprises a power supply module, a rotating speed signal amplification module, a rotating speed signal shaping module and a sensor test signal module, wherein the power supply module is externally connected with a direct current signal, the rotating speed signal amplification module amplifies a rotating speed signal output by a double-winding magnetoelectric rotating speed sensor arranged on a gear at the front end of a diesel engine into a rotating speed signal with a fixed amplitude, the rotating speed signal shaping module shapes the rotating speed signal with the fixed amplitude output by the rotating speed signal amplification module into a square wave signal with a regular waveform and outputs the square wave signal to a rotating speed signal application device, and the sensor test signal output by the rotating speed signal application device is amplified in power through a sensor test signal amplification circuit. The invention outputs the irregular rotating speed signal with smaller amplitude output by the double-winding magnetoelectric rotating speed sensor into the square wave signal with larger amplitude and fixed amplitude, so that the rotating speed signal of the diesel engine can effectively resist attenuation and interference in the transmission process, and the signal-to-noise ratio of the rotating speed signal is improved.)

1. A diesel engine rotational speed signal preamplification device is characterized in that: the device comprises a power module, a rotating speed signal amplifying module, a rotating speed signal shaping module and a sensor testing signal module, wherein the power module is externally connected with a direct current signal, the rotating speed signal amplifying module comprises a rotating speed signal amplifying circuit, the rotating speed signal amplifying circuit receives the power supply of the power module and amplifies a rotating speed signal output by a double-winding magnetoelectric rotating speed sensor arranged on a gear at the front end of a diesel engine into a rotating speed signal with a fixed amplitude, the rotating speed signal shaping module comprises a rotating speed signal rectifying circuit, the rotating speed signal rectifying circuit receives the power supply of the power module and shapes the rotating speed signal with the fixed amplitude output by the rotating speed signal amplifying module into a square wave signal with a regular waveform, and output to the rotating speed signal application device, the sensor test signal module comprises a sensor test signal amplifying circuit, when the diesel engine is in a shutdown state, the sensor test signal output by the rotating speed signal application device is subjected to power amplification through the sensor test signal amplification circuit.

Technical Field

The invention relates to a signal processing device of a diesel engine, in particular to a rotating speed signal processing device of the diesel engine.

Background

The rotation speed of the diesel engine is an important signal in a diesel engine system, and has important significance for monitoring the running state of the diesel engine.

Most of the rotation speed signals output by the magnetoelectric rotation speed sensors are pulse signals (approximate sine waves or rectangular waves) and are not regular square wave signals. When the diesel engine runs at a low rotating speed, the amplitude of a rotating speed signal output by a double-winding magnetoelectric rotating speed sensor arranged on a front-end gear of the diesel engine is small and irregular, if the rotating speed signal is transmitted for a long distance, the rotating speed signal is necessarily attenuated and interfered, and the signal-to-noise ratio is necessarily reduced.

The invention patent of publication number CN208190609 discloses an acoustic emission signal preamplification device, which is characterized in that a first amplifier is connected with a plurality of band-pass filters through a first switch selection switch, the plurality of band-pass filters can be configured with different filtering frequency domains, and the first switch selection switch can be used for forming switching selection of the filtering frequency domains, so that the device can adapt to various acoustic emission signal detection scenes. The invention does not relate to the amplification and shaping of the diesel engine speed signal.

The invention patent of publication number CN207251558U discloses a sensor signal preamplification device, which is characterized in that the device receives 12-40V alternating current and direct current power supply, a rectification circuit rectifies the alternating current and then isolates and transforms the alternating current to supply power to other parts, the device can provide constant current power supply for various sensors, and an instrument amplifier is adopted, so that a filter can be matched independently according to different use environments to achieve the best performance. The invention does not relate to the amplification and the shaping of the rotating speed signal output by the double-winding magnetoelectric rotating speed sensor which is arranged on the front end gear of the diesel engine and does not need to supply power, and the invention has no sensor testing and diagnosing functions.

Disclosure of Invention

The invention aims to provide a diesel engine rotating speed signal pre-amplification device for inputting and amplifying a rotating speed signal of an overspeed protection device.

The purpose of the invention is realized as follows:

the invention relates to a diesel engine rotating speed signal preamplification device, which is characterized in that: the device comprises a power module, a rotating speed signal amplifying module, a rotating speed signal shaping module and a sensor testing signal module, wherein the power module is externally connected with a direct current signal, the rotating speed signal amplifying module comprises a rotating speed signal amplifying circuit, the rotating speed signal amplifying circuit receives the power supply of the power module and amplifies a rotating speed signal output by a double-winding magnetoelectric rotating speed sensor arranged on a gear at the front end of a diesel engine into a rotating speed signal with a fixed amplitude, the rotating speed signal shaping module comprises a rotating speed signal rectifying circuit, the rotating speed signal rectifying circuit receives the power supply of the power module and shapes the rotating speed signal with the fixed amplitude output by the rotating speed signal amplifying module into a square wave signal with a regular waveform, and output to the rotating speed signal application device, the sensor test signal module comprises a sensor test signal amplifying circuit, when the diesel engine is in a shutdown state, the sensor test signal output by the rotating speed signal application device is subjected to power amplification through the sensor test signal amplification circuit.

The invention has the advantages that: the invention outputs the irregular rotating speed signal with smaller amplitude output by the double-winding magnetoelectric rotating speed sensor into the square wave signal with larger amplitude and fixed amplitude, so that the rotating speed signal of the diesel engine can effectively resist attenuation and interference in the transmission process, and the signal-to-noise ratio of the rotating speed signal is improved. The sensor test signal module can detect and diagnose whether the double-winding magnetoelectric rotating speed sensor can work normally or not.

Drawings

FIG. 1 is a schematic structural diagram of the apparatus of the present invention.

Detailed Description

The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:

with reference to fig. 1, the diesel engine speed signal preamplifier of the invention comprises the following four modules: the device comprises a power module 1, a rotating speed signal amplifying module 2, a rotating speed signal shaping module 3 and a sensor test signal module 4.

The power module of the diesel engine rotating speed signal pre-amplification device is externally connected with a 24V direct current signal and supplies power for the rotating speed signal amplification module and the rotating speed signal shaping module.

The rotation speed signal amplifying module of the diesel engine rotation speed signal pre-amplifying device mainly comprises a rotation speed signal amplifying circuit. The amplifying circuit of the rotating speed signal amplifying module receives power supply of the power supply module and amplifies a rotating speed signal output by a double-winding magnetoelectric rotating speed sensor arranged on a front-end gear of the diesel engine into a rotating speed signal with a fixed amplitude.

The rotating speed signal shaping module of the diesel engine rotating speed signal pre-amplifying device mainly comprises a rotating speed signal rectifying circuit. And a shaping circuit of the rotating speed signal shaping module receives the power supply of the power supply module, shapes the rotating speed signal with fixed amplitude output by the rotating speed signal amplifying module into a square wave signal with a regular waveform, and outputs the square wave signal to the rotating speed signal application device.

The sensor test signal module of the diesel engine rotating speed signal preamplification device mainly comprises a sensor test signal amplification circuit. When the diesel engine is in a shutdown state, the sensor test signal output by the rotating speed signal application device cannot directly excite the double-winding magnetoelectric rotating speed sensor, and power amplification is required to be carried out through the sensor test signal amplification circuit so as to meet excitation requirements, so that the detection and diagnosis functions of the sensor test signal amplification circuit are realized.