CN111189644A - Detection system for determining opening and closing time of air valve - Google Patents
Detection system for determining opening and closing time of air valve Download PDFInfo
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- CN111189644A CN111189644A CN202010150939.1A CN202010150939A CN111189644A CN 111189644 A CN111189644 A CN 111189644A CN 202010150939 A CN202010150939 A CN 202010150939A CN 111189644 A CN111189644 A CN 111189644A
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- engine
- valve
- displacement sensor
- detection system
- electronic angle
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- G—PHYSICS
- 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
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a detection system for determining the opening and closing time of a valve, which comprises a cylinder pressure sensor and a displacement sensor which are arranged on a cylinder cover of an engine, an electronic angle mark instrument which is arranged at the front end of a crankshaft of the engine, and a combustion analyzer which is respectively connected with the cylinder pressure sensor, the displacement sensor and the electronic angle mark instrument. The application discloses a measurement engine valve opens and closes detection system at moment, through one section valve lift under the non-contact's eddy current displacement sensor cooperation bent axle front end electronic angle scale appearance collection engine ignition state, the moment that the valve opened and closed under the accurate measurement engine ignition state, the valve opened and closed measuring accuracy under the engine ignition state has been guaranteed.
Description
Technical Field
The invention relates to the technical field of automobile engine testing, in particular to a detection system for determining opening and closing moments of an air valve.
Background
The engine plays an extremely important role in the industrial field, and in the ignition state, because of the inertia effect and thermal expansion of parts of the valve train in high-speed operation, the opening and closing moments of the engine valve are different from those in a static state, and the engine valve is different under different working conditions. The engine valve mechanism has compact structure and high valve opening and closing frequency, and the high-temperature and high-pressure environment of the valve during working is complex and changeable, so that the valve opening and closing time under the ignition state of the engine is difficult to measure, and therefore, in order to ensure that the air inlet of an engine cylinder is sufficient and the exhaust is thorough, the engine valve opening and closing time needs to be tested in the engine research and development stage so as to ensure that the design requirement is met.
The existing measuring method is to measure the opening and closing time of the engine valve in a static state, specifically, the top dead center mark on the side surface of a flywheel and the mark on a camshaft, or a height dial indicator determines the top dead center of a piston, an index plate is arranged on the flywheel, then the opening and closing positions of the valve are observed by using the height dial indicator, and the opening and closing time of the valve can be obtained by the index plate; secondly, the difference between the opening time and the closing time of the valve under different working conditions cannot be measured by static measurement; finally, due to the influence of various factors during the operation of the internal combustion engine, the top dead center position in the operating state differs from that in the static state.
Therefore, how to provide a device for accurately measuring the opening and closing time of an engine valve in an engine ignition state is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a detection system for determining the opening and closing time of an air valve, which collects the air valve lift in the ignition state of an engine by matching a displacement sensor with an electronic angle indicator at the front end of a crankshaft and accurately measures the opening and closing time of the air valve in the ignition state of the engine.
In order to solve the technical problem, the invention provides a detection system for determining the opening and closing time of a valve, which comprises a cylinder pressure sensor and a displacement sensor which are arranged on a cylinder cover of an engine, an electronic angle scale instrument which is arranged at the front end of a crankshaft of the engine, and a combustion analyzer which is respectively connected with the cylinder pressure sensor, the displacement sensor and the electronic angle scale instrument.
Preferably, the displacement sensor is an eddy current displacement sensor.
Preferably, the probes of the eddy current displacement sensor are vertically aligned with the intake valve spring seat and the exhaust valve spring seat through brackets respectively.
Preferably, the electronic angle marking instrument is mounted at the front end of the engine crankshaft through a connecting disc.
Preferably, the valve spring seat is a customizable oversized valve spring seat.
Preferably, the electric dynamometer machine further comprises an electric dynamometer machine stand connected with the engine.
Preferably, the fuel gas combustion analyzer further comprises a signal amplifier respectively connected with the cylinder pressure sensor, the displacement sensor and the electronic angle marking instrument, and the output end of the signal amplifier is connected with the combustion analyzer.
The invention provides a detection system for determining the opening and closing time of a valve, which comprises a cylinder pressure sensor and a displacement sensor which are arranged on a cylinder cover of an engine, an electronic angle scale instrument which is arranged at the front end of a crankshaft of the engine, and a combustion analyzer which is respectively connected with the cylinder pressure sensor, the displacement sensor and the electronic angle scale instrument. The application discloses a measurement engine valve opens and closes detection system at moment, through non-contact's eddy current displacement sensor cooperation bent axle front end electronic angle scale appearance collection engine ignition state's valve lift, only need measure the valve and open and close a small segment valve dynamic lift of process, guaranteed that engine ignition state is under the valve and opened and close measuring accuracy to avoid signal distortion through signal amplifier, further ensured measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Wherein, in fig. 1:
the device comprises an engine-1, a cylinder pressure sensor-2, a displacement sensor-3, an electronic angle marking instrument-4, a combustion analyzer-5, an electric dynamometer bench-6 and a signal amplifier-7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
In one embodiment provided by the invention, the device mainly comprises a cylinder pressure sensor 2 and a displacement sensor 3 which are arranged on a cylinder cover of an engine 1, an electronic angle scale 4 arranged at the front end of a crankshaft of the engine 1, and a combustion analyzer 5 respectively connected with the cylinder pressure sensor 2, the displacement sensor 3 and the electronic angle scale 4.
The engine 1 is a measuring body, the cylinder pressure sensor 2 is installed on a cylinder cover of the engine 1 and used for detecting the pressure of an engine cylinder and converting the pressure into an electric signal, the displacement sensor 3 is installed on the cylinder cover of the engine 1 and used for measuring the positions of an air inlet valve and an air outlet valve of the engine 1 and transmitting the signal to the combustion analyzer 5, the electronic angle scale 4 is installed at the front end of a crankshaft of the engine 1 and used for measuring the angle of the crankshaft of the engine 1 and transmitting the information of the angle to the combustion analyzer 5, and the combustion analyzer 5 is used for processing the signal and generating a dynamic valve lift curve in the opening and closing process of an air inlet valve and the air outlet valve.
Specifically, in the practical application process, a cylinder cover housing of the engine 1 is opened, the valve clearance is adjusted to a specified value, a cylinder pressure sensor 2 and a displacement sensor 3 are installed, 2 displacement sensor 3 probes are used to vertically align an air inlet valve spring seat and an air outlet valve spring seat through a support respectively, a proper clearance is reserved, an electronic angle mark instrument 4 is connected to the front end of a crankshaft of the engine 1 through a connecting disc, firstly, the engine 1 is not ignited, an electric dynamometer rack 6 is used for dragging the engine 1, and a combustion analyzer 5 can determine the compression top dead center of the engine 1 through the cylinder pressure sensor 2, the electronic angle mark instrument 4 and a signal amplifier 7 on the cylinder cover and is used as a reference zero point of the crankshaft rotation angle; then, the engine 1 is started, after the test working condition runs stably, the combustion analyzer 5 can obtain a dynamic valve lift curve in the opening and closing process of the intake valve and the exhaust valve through the displacement sensor 3, the electronic angle indicator 4 and the signal amplifier 7, and finally, a crank angle when the valve is opened and closed, namely the opening and closing time of the valve, can be seen from the dynamic valve curve.
In order to optimize the advantage that the detection system for determining the valve opening and closing timings in the above-described embodiment can provide more accurate timing information, the displacement sensor 3 is an eddy current displacement sensor. At present, in the prior art, a contact displacement sensor is adopted to detect the positions of an air inlet valve and an air outlet valve, but the contact displacement sensor cannot meet the measurement requirement in an ignition state.
Based on the detection system, the detection system has the advantage of more accurately measuring the opening and closing time of the air valve of the engine 1, and the probes of the eddy current displacement sensor are vertically aligned with the air inlet valve spring seat and the air outlet valve spring seat through the support respectively. The eddy current displacement sensor belongs to a high-precision sensor, and therefore, in the measuring process, stricter mechanical position structure requirements are required, more accurate data measurement can be guaranteed, the scheme is that the mechanical structure is installed according to a high standard, the eddy current displacement sensor is vertically aligned with an air inlet valve spring seat and an air exhaust valve spring seat, the position precision of the air inlet valve detected by the eddy current displacement sensor can be improved, and the measuring precision of the engine 1 at the moment of opening and closing the air inlet valve is further improved. In addition, the scheme measures a very small section of the dynamic lift of the valve in the opening and closing process of the valve through the eddy current displacement sensor, only measures the time point of the opening and closing time of the valve in the dynamic lift process of the valve, can improve the measurement precision, meets the condition of measuring the opening and closing time requirements of the valve, has a small measuring range and is convenient to arrange, and certainly, the eddy current displacement sensor can be matched with a customized and enlarged valve spring seat to adapt to different measurement conditions without specific limitation.
The electronic angle gage 4 is attached to the front end of the crankshaft of the engine 1 via a connecting plate. The crank angle is 360 degrees of the engine crank shaft rotating for one circle, the ignition time of the ignition type engine, the fuel injection time of the compression ignition type engine and the opening and closing time of the air inlet and outlet valves are set by taking the crank angle as a reference, and the accurate relation between the valve lift and the crank angle is obtained by installing the electronic angle scale 4 at the front end of the crank shaft and matching with the displacement sensor 3, so that the measured valve opening and closing time is more accurate.
It should also be noted that the detection system for determining the valve opening and closing moments also comprises an electric dynamometer bench 6 for connection with the engine 1. According to the scheme, the engine 1 is dragged backwards through the electric dynamometer rack 6, so that the combustion analyzer 5, the cylinder pressure sensor 2 and the electronic angle mark instrument 4 find the top dead center of the piston, the measurement is convenient and accurate, the precision of the top dead center can be controlled, and the measurement accuracy is ensured.
Further, the detection system for determining the opening and closing time of the valve further comprises a signal amplifier 7 respectively connected with the cylinder pressure sensor 2, the displacement sensor 3 and the electronic angle scale 4, and the output end of the signal amplifier 7 is connected with the combustion analyzer 5. The collected information of the cylinder pressure sensor 2, the displacement sensor 3 and the electronic angle scale 4 is amplified through the signal amplifier 7, the calculation precision of the combustion analyzer 5 can be improved, the signal loss condition is avoided, and the precision of measuring the opening and closing time of the air valve is further improved.
In summary, the detection system for determining the opening and closing time of the valve provided by this embodiment mainly includes a cylinder pressure sensor and a displacement sensor for being installed on a cylinder head of an engine, an electronic angle scale for being installed at the front end of a crankshaft of the engine, and a combustion analyzer respectively connected to the cylinder pressure sensor, the displacement sensor and the electronic angle scale. The application discloses a measurement engine valve opens and closes detection system at moment, through high accuracy, non-contact's electric eddy current displacement sensor cooperation bent axle front end electronic angle mark appearance collection engine ignition state's valve lift, only need measure the valve and open and close a small segment valve dynamic lift of process, guaranteed that the valve opens and closes measuring accuracy under the engine ignition state to avoid signal distortion through signal amplifier, further ensured measurement accuracy.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A detection system for determining the opening and closing time of a valve is characterized by comprising a cylinder pressure sensor (2) and a displacement sensor (3) which are installed on a cylinder cover of an engine (1), an electronic angle indicator (4) which is installed at the front end of a crankshaft of the engine (1), and a combustion analyzer (5) which is respectively connected with the cylinder pressure sensor (2), the displacement sensor (3) and the electronic angle indicator (4).
2. Detection system according to claim 1, characterized in that the displacement sensor (3) is an eddy current displacement sensor.
3. The sensing system of claim 2, wherein the probes of the eddy current displacement sensor are disposed in vertical alignment with the intake and exhaust valve spring seats, respectively, by a bracket.
4. A detection system according to claim 3, characterized in that the electronic angle marking device (4) is mounted on the front end of the crankshaft of the engine (1) by means of a connecting disc.
5. The detection system of claim 1, wherein the valve spring seat is a customizable oversized valve spring seat.
6. A detection system according to claim 1, further comprising an electric dynamometer bench (6) for connection with the engine (1).
7. A detection system according to claim 1, characterized by further comprising a signal amplifier (7) connected to the cylinder pressure sensor (2), the displacement sensor (3) and the electronic angle gauge (4), respectively, the output of the signal amplifier (7) being connected to the combustion analyzer (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010150939.1A CN111189644A (en) | 2020-03-06 | 2020-03-06 | Detection system for determining opening and closing time of air valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010150939.1A CN111189644A (en) | 2020-03-06 | 2020-03-06 | Detection system for determining opening and closing time of air valve |
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| Publication Number | Publication Date |
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| CN111189644A true CN111189644A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010150939.1A Pending CN111189644A (en) | 2020-03-06 | 2020-03-06 | Detection system for determining opening and closing time of air valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213111A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Engine timing measurement method and system and storage medium |
| CN112213110A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Method and system for measuring phase of driving cam of high-pressure oil pump of gasoline engine and storage medium |
-
2020
- 2020-03-06 CN CN202010150939.1A patent/CN111189644A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213111A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Engine timing measurement method and system and storage medium |
| CN112213110A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Method and system for measuring phase of driving cam of high-pressure oil pump of gasoline engine and storage medium |
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