CN112113769A - Conversion device and conversion method for engine crankshaft angle mark signal - Google Patents
Conversion device and conversion method for engine crankshaft angle mark signal Download PDFInfo
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Abstract
The invention discloses a conversion device and a conversion method for an engine crankshaft angle mark signal, which comprise the following steps: the crankshaft position signal panel is arranged at the front end of the crankshaft and can rotate along with the crankshaft, and the crankshaft position signal panel comprises a plurality of signal teeth; the crankshaft position sensor is arranged at the edge of the crankshaft position signal panel and is in contact with the plurality of signal teeth, and generates a group of sinusoidal pulse signals through the plurality of signal teeth when the crankshaft position signal panel rotates for one circle; the voltage comparator is in data connection with the crankshaft position sensor and converts the sinusoidal pulse signal into a square wave pulse signal; the signal processing system is in data connection with the voltage comparator and processes the square wave pulse signal, the signal processing system comprises a first port and a second port, the first port outputs a continuous wave-proof pulse signal, and the second port outputs a trigger signal; and the voltage amplifier is in data connection with the signal processing system and performs voltage amplification processing on the continuous wave-preventing pulse signal and the trigger signal. Thereby saving the time for installing the angle marking instrument.
Description
Technical Field
The invention relates to the field of engines, in particular to a conversion device and a conversion method for an engine crankshaft angle mark signal.
Background
When an engine is used for a combustion analysis test, the collected data is data taking a crankshaft angle as an abscissa, and at present, an angle indicator is generally arranged at the front end of a crankshaft to provide a crankshaft angle signal for a combustion analyzer. Typically, the angle gauge generates a square wave pulse signal (720 pulses per 360 degrees) for every 0.5 degree turn of the crankshaft, and a square wave trigger signal for every 360 degrees of the crankshaft. Therefore, the angle gauge generates a path of pulse signals for calculating the crank angle and a path of trigger signals for judging whether the crank angle rotates for one circle (360 degrees) or not, and the pulse signals are used for the combustion analyzer to collect data based on the angle base.
In the prior art, a method for providing a pulse signal and a trigger signal of a crank angle to a combustion analyzer by installing an angle standard instrument at the front end of a crankshaft of an engine needs to install the angle standard instrument at the front end of the crankshaft of the engine, when the angle standard instrument is installed, the requirement on the coaxiality of a rotating shaft of the angle standard instrument and the crankshaft of the engine is higher, the coaxiality of the two shafts needs to be adjusted within phi 0.2mm, otherwise the angle standard instrument can be damaged, so that the time consumed when the angle standard instrument is installed is longer, the installation time generally needs 2-3 hours, and the test efficiency of a bench is seriously influenced. And when the whole vehicle is tested on the road, because the engine compartment space is smaller, the angle marking instrument cannot be arranged at the front end of the crankshaft, and the combustion analysis test cannot be carried out when the whole vehicle is tested on the road.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a conversion device for an engine crankshaft angle mark signal, which can achieve the purpose of a combustion analysis test without installing an angle mark instrument.
Another object of the present invention is to provide a method for converting a crankshaft angle mark signal of an engine, which utilizes the aforementioned conversion device to provide test data for a combustion analyzer.
In order to achieve the purpose, the invention provides a conversion device of an engine crankshaft angle mark signal, which comprises a crankshaft position signal disc, a crankshaft position sensor, a voltage comparator, a signal processing system, a voltage amplifier and a combustion analyzer. The crankshaft position signal panel is arranged at the front end of the crankshaft and can rotate along with the crankshaft, and the crankshaft position signal panel comprises a plurality of signal teeth; the crankshaft position sensor is arranged at the edge of the crankshaft position signal panel and is in contact with the plurality of signal teeth, and generates a group of sinusoidal pulse signals through the plurality of signal teeth when the crankshaft position signal panel rotates for one circle; the voltage comparator is in data connection with the crankshaft position sensor and converts the sinusoidal pulse signal into a square wave pulse signal; the signal processing system is in data connection with the voltage comparator and processes the square wave pulse signal, the signal processing system comprises a first port and a second port, the first port outputs a continuous wave-proof pulse signal, and the second port outputs a trigger signal; and the voltage amplifier is in data connection with the signal processing system and performs voltage amplification processing on the continuous wave-preventing pulse signal and the trigger signal.
In a preferred embodiment, the signal processing system adopts an STM32 singlechip signal processing system.
In a preferred embodiment, the number of the plurality of signal teeth is 60-2.
In order to achieve the above another object, the present invention provides a method for converting a crankshaft angle mark signal of an engine, which applies the foregoing conversion device, and the method comprises: the crankshaft position sensor transmits the generated sine pulse signal to the voltage comparator; the voltage comparator converts the sinusoidal pulse signal into a square wave pulse signal and transmits the square wave pulse signal to the signal processing system; and the signal processing system is used for carrying out signal acquisition and processing on the received square wave pulse signal and transmitting the continuous square wave pulse signal output by the first port and the trigger signal output by the second port to the voltage amplifier.
In a preferred embodiment, the signal processing system for signal processing the square wave pulse signal includes: the signal processing system measures the frequency of three continuous pulses of the square wave pulse signal and records the frequency as f1, f2 and f 3; f1, f2 and f3 are compared to judge whether the currently measured pulse is the pulse at the tooth missing position; when f1 f2 f3, it indicates that the measurement is not missing teeth. A first port of the signal processing system outputs a square wave signal according to 12 times of frequency f3, and a second port keeps outputting a low-level signal; when f1/3 is f2 is f3/3, the second square wave measured is the edentulous signal, the first port of the signal processing system outputs the square wave signal with the frequency of 12 times of f3, the second port keeps outputting the high level signal, and the duration of the high level signal is 1/f 3; when f1 is f2/3 is f3/3, the first square wave measured is the edentulous signal, the first port of the signal processing system outputs the square wave signal with the frequency of 12 times of f3, the second port keeps outputting the high level signal, and the duration of the high level signal is 1/f 3; when f1/3 is f2/3 is f3, the measured third square wave is an edentulous signal, the first port of the signal processing system outputs a square wave signal with the frequency being 12 times of f1, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 1; wherein the high level signal is a trigger signal.
In a preferred embodiment, the voltage amplifier voltage-amplifies the continuous square-wave pulse signal and the trigger signal before transmitting them to the combustion analyzer.
Compared with the prior art, the conversion device and the conversion method of the engine crankshaft angle marking signal have the following beneficial effects: the engine crankshaft position sensor converts the signal of the existing crankshaft position signal disc of the engine into a corner mark instrument signal used by the combustion analyzer. The time for installing the angle marking instrument is saved, and therefore the purpose of improving the test efficiency is achieved.
Drawings
FIG. 1 is a schematic diagram of the component components of a conversion device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a switching device according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a translation method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the signals required by a combustion analyzer according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of a conversion process according to an embodiment of the invention.
Description of the main reference numerals:
1-crankshaft position signal panel, 11-signal teeth, 12-missing teeth part, 2-crankshaft position sensor, 3-voltage comparator, 4-signal processing system, A-first port, B-second port, 5-voltage amplifier and 6-combustion analyzer.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1 to 2, the conversion device for the engine crankshaft angle scale signal according to the preferred embodiment of the present invention includes a crankshaft position signal panel 1, a crankshaft position sensor 2, a voltage comparator 3, a signal processing system 4, a voltage amplifier 5, and a combustion analyzer 6.
Referring to fig. 1, in some embodiments, a crankshaft position signal disc 1 is disposed at a front end of a crankshaft and can rotate along with the crankshaft, and the crankshaft position signal disc 1 includes a plurality of signal teeth 11. The crankshaft position sensor 2 is disposed at an edge of the crankshaft position signal plate 1 and contacts the plurality of signal teeth 11, and the crankshaft position sensor 2 generates a set of sinusoidal pulse signals through the plurality of signal teeth 11 for each rotation of the crankshaft position signal plate 1. The voltage comparator 3 is in data connection with the crankshaft position sensor 2 and converts the sinusoidal pulse signal into a square-wave pulse signal. The signal processing system 4 is in data connection with the voltage comparator 3 and processes square wave pulse signals, the signal processing system 4 comprises a first port A and a second port B, the first port A outputs continuous wave-prevention pulse signals, and the second port B outputs trigger signals. And the voltage amplifier 5 is in data connection with the signal processing system 4 and performs voltage amplification processing on the continuous wave prevention pulse signal and the trigger signal.
Referring to fig. 2, in some embodiments, the signal processing system 4 is, but not limited to, an STM32 single chip microcomputer signal processing system. The crankshaft position signal plate 1 generally has a number of signal teeth 11 of, but not limited to, 60-2, and the number of signal teeth 11 is also 30-2. The missing tooth parts 12 of the crankshaft position signal plate 1 are typically represented by two missing teeth.
As shown in fig. 3 to fig. 5, to achieve the above another object, the present invention provides a method for converting a crankshaft angle mark signal of an engine, which applies the above-mentioned converting apparatus to perform signal conversion, and the method includes: the crankshaft position sensor 2 transmits the generated sinusoidal pulse signal to the voltage comparator 3; the voltage comparator 3 converts the sine pulse signal into a square wave pulse signal and transmits the square wave pulse signal to the signal processing system 4; and the signal processing system 4 is used for carrying out signal acquisition and processing on the received square wave pulse signal and transmitting the continuous square wave pulse signal output by the first port A and the trigger signal output by the second port B to the voltage amplifier 5.
In some embodiments, the signal processing system 4 performs signal processing on the square wave pulse signal, including: the signal processing system 4 measures the frequency of three consecutive pulses of the square wave pulse signal, and records it as f1, f2, f 3; f1, f2 and f3 are compared to judge whether the currently measured pulse is the pulse at the tooth missing position; when f1 f2 f3, it indicates that the measurement is not missing teeth. The first port A of the signal processing system 4 outputs a square wave signal according to the frequency of 12 times of f3, and the second port B keeps outputting a low-level signal; when f1/3 is f2 is f3/3, it indicates that the second square wave measured is an edentulous signal, the first port a of the signal processing system 4 outputs a square wave signal at a frequency 12 times of f3, the second port B keeps outputting a high level signal, and the duration of the high level signal is 1/f 3; when f1 is f2/3 is f3/3, it indicates that the first square wave measured is an edentulous signal, the first port a of the signal processing system 4 outputs a square wave signal at a frequency 12 times of f3, the second port B keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 3; when f1/3 is f2/3 is f3, it indicates that the measured third square wave is an edentulous signal, the first port a of the signal processing system 4 outputs a square wave signal at a frequency 12 times of f1, the second port B keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 1; wherein the high level signal is a trigger signal.
In some embodiments, the voltage amplifier 5 voltage amplifies the continuous square wave pulse signal and the trigger signal before transmitting to the combustion analyzer 6.
Referring to fig. 4, two signals, one continuous pulse square wave signal and one trigger signal, which are required by the combustion analyzer 6 during operation, are generated by the corner mark instrument.
Referring to fig. 5, the sinusoidal pulse signal from the crank position sensor 2 is converted into the angular scale signals, i.e., the continuous pulse square wave signal and the trigger signal, required by the combustion analyzer 6 during operation by the conversion apparatus and the conversion method of the present invention.
In summary, the conversion device and the conversion method for the engine crankshaft angle marking signal of the invention have the following advantages: the engine crankshaft position sensor converts the signal of the existing crankshaft position signal disc of the engine into a corner mark instrument signal used by the combustion analyzer. The time for installing the angle marking instrument is saved, and therefore the purpose of improving the test efficiency is achieved.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. An apparatus for converting a crankshaft angle mark signal of an engine, comprising:
the crankshaft position signal disc is arranged at the front end of the crankshaft and can rotate along with the crankshaft, and the crankshaft position signal disc comprises a plurality of signal teeth;
a crankshaft position sensor disposed at an edge of the crankshaft position signal pad and contacting the plurality of signal teeth, the crankshaft position sensor generating a set of sinusoidal pulse signals from the plurality of signal teeth for each revolution of the crankshaft position signal pad;
the voltage comparator is in data connection with the crankshaft position sensor and converts the sinusoidal pulse signal into a square wave pulse signal;
the signal processing system is in data connection with the voltage comparator and processes the square wave pulse signal, the signal processing system comprises a first port and a second port, the first port outputs a continuous wave-proof pulse signal, and the second port outputs a trigger signal; and
and the voltage amplifier is in data connection with the signal processing system and is used for performing voltage amplification processing on the continuous wave-preventing pulse signal and the trigger signal.
2. The apparatus for converting engine crankshaft angle marking signals as claimed in claim 1, wherein said signal processing system employs an STM32 single chip microcomputer signal processing system.
3. The apparatus for converting an engine crankshaft angle marking signal of claim 1, wherein said plurality of signal teeth is 60-2 in number.
4. A conversion method of an engine crankshaft angle mark signal to which the conversion apparatus according to any one of claims 1 to 3 is applied, characterized by comprising:
the crankshaft position sensor transmits the generated sinusoidal pulse signal to the voltage comparator;
the voltage comparator converts the sinusoidal pulse signal into a square wave pulse signal and transmits the square wave pulse signal to the signal processing system; and
the signal processing system is used for carrying out signal acquisition and processing on the received square wave pulse signal and transmitting a continuous square wave pulse signal output by the first port and a trigger signal output by the second port to the voltage amplifier.
5. The method for converting an engine crankshaft angle mark signal as claimed in claim 4, wherein said signal processing system signal processing said square wave pulse signal comprises:
the signal processing system measures the frequency of three consecutive pulses of the square wave pulse signal and records the frequency as f1, f2, f 3;
f1, f2 and f3 are compared to judge whether the currently measured pulse is the pulse at the tooth missing position;
when f1 is f2 is f3, the measurement is not missing teeth, the first port of the signal processing system outputs a square wave signal at the frequency of 12 times of f3, and the second port keeps outputting a low-level signal;
when f1/3 is f2 is f3/3, the second square wave measured is the edentulous signal, the first port of the signal processing system outputs a square wave signal at the frequency of 12 times of f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 3;
when f1 is f2/3 is f3/3, the first square wave measured is an edentulous signal, the first port of the signal processing system outputs a square wave signal at the frequency of 12 times of f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 3;
when f1/3 is f2/3 is f3, the measured third square wave is indicated to be an edentulous signal, the first port of the signal processing system outputs a square wave signal at a frequency which is 12 times of f1, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f 1;
wherein the high level signal is a trigger signal.
6. The method of converting an engine crankshaft angle marking signal of claim 5, wherein said voltage amplifier voltage amplifies said continuous square wave pulse signal and said trigger signal and transmits them to said combustion analyzer.
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