CN112113769B - Conversion method of engine crankshaft angle mark signal - Google Patents
Conversion method of engine crankshaft angle mark signal Download PDFInfo
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- CN112113769B CN112113769B CN202010922910.0A CN202010922910A CN112113769B CN 112113769 B CN112113769 B CN 112113769B CN 202010922910 A CN202010922910 A CN 202010922910A CN 112113769 B CN112113769 B CN 112113769B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Abstract
The invention discloses a method for converting an engine crankshaft angle mark signal, which comprises 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 disc and is in contact with the plurality of signal teeth, and generates a group of sine pulse signals through the plurality of signal teeth when the crankshaft position signal disc 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 square wave 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 square wave 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 method for converting an engine crankshaft angle mark signal.
Background
When an engine is used for a combustion analysis test, collected data is data taking a crank angle as a horizontal coordinate, and at present, a corner mark instrument is generally installed at the front end of a crank shaft to provide a crank angle signal for a combustion analyzer. Typically, the angle scale generates a square wave pulse signal (720 pulses per 360 degrees) for every 0.5 degree rotation of the crankshaft, and a square wave trigger signal for every 360 degrees rotation of the crankshaft. Thus, the angle indicator generates a pulse signal for calculating the crank angle and a trigger signal for judging whether the crank angle rotates for one circle (360 degrees) or not, and the pulse signal and the trigger signal are used for collecting data based on the angle base by the combustion analyzer.
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 installed 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 standard signal, which can achieve the purpose of a combustion analysis test without installing an angle standard 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 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; 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 square wave 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 square wave 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 f3; comparing f1, f2 and f3, and judging whether the currently measured pulse is the pulse at the tooth missing position; when f1= f2= f3, it indicates that the tooth is not missing. A first port of the signal processing system outputs square wave signals according to 12 times of frequency f3, and a second port keeps outputting low-level signals; when f1/3= f2= f3/3, it indicates that the second square wave measured is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency 12 times of f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f3; when f1= f2/3= f3/3, it indicates that the first square wave measured is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency 12 times of f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f3; when f1/3= f2/3= f3, it indicates that the measured third square wave is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency of 12 times f1, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f1; 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 for 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:
the device comprises a crankshaft position signal panel 1, a crankshaft position signal panel 11, a signal tooth 12, a tooth missing part 2, a crankshaft position sensor 3, a voltage comparator 4, a signal processing system A, a first port A, a second port B, a voltage amplifier 5 and a combustion analyzer 6.
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 term "comprise" or variations such as "comprises" or "comprising", etc., 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 device for converting an engine crank angle signal according to the preferred embodiment of the present invention includes a crank position signal panel 1, a crank 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 the edge of the crankshaft position signal panel 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 panel 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 the square wave pulse signal, the signal processing system 4 comprises a first port A and a second port B, the first port A outputs a continuous square wave pulse signal, and the second port B outputs a trigger signal. The voltage amplifier 5 is connected with the signal processing system 4 in a data mode and is used for carrying out voltage amplification processing on the continuous square wave pulse signals and the trigger signals.
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 disc 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 in the case of 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 the frequency as f1, f2 and f3; comparing f1, f2 and f3, and judging whether the currently measured pulse is the pulse at the tooth missing position; when f1= f2= f3, it indicates that the tooth is not missing. A first port A of the signal processing system 4 outputs square wave signals according to 12 times of frequency f3, and a second port B keeps outputting low-level signals; when f1/3= f2= f3/3, it indicates that the measured second square wave is the missing tooth signal, the first port a of the signal processing system 4 outputs the square wave signal at a frequency of 12 times f3, the second port B keeps outputting the high-level signal, and the duration of the high-level signal is 1/f3; when f1= f2/3= f3/3, it indicates that the first square wave measured is the tooth missing signal, the first port a of the signal processing system 4 outputs a square wave signal at a frequency of 12 times f3, and the second port B keeps outputting a high-level signal, and the duration of the high-level signal is 1/f3; when f1/3= f2/3= f3, it indicates that the measured third square wave is a missing tooth signal, the first port a of the signal processing system 4 outputs a square wave signal at a frequency of 12 times f1, and the second port B keeps outputting a high-level signal, where the duration of the high-level signal is 1/f1; 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 signal, 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 sign 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. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A method for converting a crankshaft angle mark signal of an engine is realized by a conversion device of the crankshaft angle mark signal of the engine, and the conversion device is characterized by comprising the following steps:
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 through 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 square wave pulse signal, and the second port outputs a trigger signal; and
the voltage amplifier is in data connection with the signal processing system and is used for performing voltage amplification processing on the continuous square wave pulse signal and the trigger signal;
the conversion method comprises the following steps:
the crankshaft position sensor transmits the generated sinusoidal pulse signal to the voltage comparator;
the voltage comparator converts the sine 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 acquiring and processing 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;
the signal processing system for signal processing of the square wave pulse signal comprises:
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 f3;
comparing f1, f2 and f3, and judging whether the currently measured pulse is the pulse at the tooth missing position;
when f1= f2= f3, indicating that the measurement is not missing teeth, the first port of the signal processing system outputs a square wave signal at a frequency of 12 times f3, and the second port keeps outputting a low-level signal;
when f1/3= f2= f3/3, it indicates that the second square wave measured is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency of 12 times f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f3;
when f1= f2/3= f3/3, it indicates that the first square wave measured is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency of 12 times f3, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f3;
when f1/3= f2/3= f3, it indicates that the measured third square wave is a missing tooth signal, the first port of the signal processing system outputs a square wave signal at a frequency of 12 times f1, the second port keeps outputting a high-level signal, and the duration of the high-level signal is 1/f1;
wherein the high level signal is a trigger signal.
2. The method for converting the engine crankshaft angle marking signal as claimed in claim 1, wherein said signal processing system adopts an STM32 single chip microcomputer signal processing system.
3. The method of converting an engine crankshaft angle marking signal of claim 1, wherein said plurality of signal teeth is 60-2 in number.
4. The method of converting an engine crankshaft angle marking signal of claim 1, further comprising a combustion analyzer in data communication with said voltage amplifier, said voltage amplifier voltage amplifying said continuous square wave pulse signal and said trigger signal for transmission to said combustion analyzer.
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| CN208091705U (en) * | 2018-05-04 | 2018-11-13 | 无锡沃尔福汽车技术有限公司 | A kind of corner marking instrument |
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| CN208091705U (en) * | 2018-05-04 | 2018-11-13 | 无锡沃尔福汽车技术有限公司 | A kind of corner marking instrument |
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