CN102081011A - Method for judging signal-acquisition initial point for four-stroke diesel engine - Google Patents
Method for judging signal-acquisition initial point for four-stroke diesel engine Download PDFInfo
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- CN102081011A CN102081011A CN2010101046038A CN201010104603A CN102081011A CN 102081011 A CN102081011 A CN 102081011A CN 2010101046038 A CN2010101046038 A CN 2010101046038A CN 201010104603 A CN201010104603 A CN 201010104603A CN 102081011 A CN102081011 A CN 102081011A
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Abstract
The invention discloses a method for judging a signal-acquisition initial point for a four-stroke diesel engine, in particular a method for judging an initial point for acquiring of rotation speed or vibration signals of a four-stroke diesel engine by adopting contactless measurement. The method specifically comprises the steps of: installing strongly magnetic steel on a side disk of a crankshaft flywheel or a free end of a diesel engine, installing a magnetoelectric tachometric transducer on a position opposite to the strongly magnetic steel, and acquiring a magnetic steel signal through the magnetoelectric tachometric transducer. Each working cycle of the four-stroke diesel engine is completed by rotation in two circles so that the magnetoelectric tachometric transducer outputs two sine wave signals which are subjected to signal treatment by an RC (Resistor-Capacitor) filter circuit; and then, the two sine wave signals are converted into square signals through a comparison circuit and then are subjected to frequency halving through a dual-D flip-flop, therefore, one required initial judging-point signal in each working cycle can be acquired and diagnosed. By using the simple mechanical magnetoelectric tachometric transducer on the crankshaft or the free end to acquire the signal, the characteristics of simplicity, reliability and the like for installation can be achieved. Meanwhile, the method is suitable for any four-stroke diesel engine equipment.
Description
Technical field
The present invention relates to diesel engine, particularly four-cycle diesel start signal discrimination technology.
Background technology
Four-cycle diesel is owing to principle of work, and its each working cycle crankshaft rotating 2 is enclosed, and piston is four power strokes up and down.Therefore, in the fault diagnosis to diesel engine, the reference position that how to obtain weekly the phase image data during deal with data is most important.Usually traditional obtain manner is obtained by TDCS TDC Sensor, CMPS Camshaft Position Sensor etc., and by TDCS TDC Sensor or Hall element, these sensors are because structure and composition problem are compared general easy breaking down with magnetoelectric sensor; And price is more expensive; Also problems such as inconvenience are installed in existence simultaneously, are installed in then to have problems such as will taking the machine casing inconvenience apart on the camshaft.
Summary of the invention
Purpose of the present invention avoids taking apart problems such as machine casing.Take simple mechanical magnetoelectric tachometric transducer to obtain weekly the acquired signal starting point of phase, promptly obtain this signal by simple mechanical magnetoelectricity speed probe on the bent axle through signal Processing.
Technical scheme of the present invention: adopt non-cpntact measurement to solve the initial judgement signal of four-cycle diesel rotating speed or vibration signals collecting data.
Be specially a high magnetic steel is installed on crankshaft of diesel engine flywheel or free-ended side disk, magnetoelectric tachometric transducer is installed on the opposite of high magnetic steel.(Fig. 1) obtain the magnet steel signal of diesel engine by magnetoelectric tachometric transducer; Concrete judgement signal circuit is by RC filtering circuit, comparator circuit, compositions such as frequency-halving circuit.(Fig. 2) each working cycle of four-cycle diesel takes two turns, so two sine wave signals of each working cycle magnetoelectric tachometric transducer output, through carrying out signal Processing behind the RC filtering circuit; Convert sine wave signal to square-wave signal by comparator circuit then,, realize the two divided-frequency of signal afterwards by double D trigger.Therefore can obtain each work period initial judging point signal that diagnosis needs.
Effect is obtained this signal by simple mechanical magnetoelectricity speed probe on the bent axle, and the measurement of this signal is most important for the location of cylinder in the fault diagnosis number.Volume of the present invention is little, and price is cheap than Hall element, has characteristics such as installation is simple, dependable performance simultaneously, avoids being installed in having problems such as will taking the machine casing inconvenience apart on the camshaft in the past, is applicable to any four-cycle diesel machine equipment.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and case study on implementation.
Fig. 1 non-cpntact measurement schematic diagram;
Fig. 2 non-cpntact measurement module diagram;
Fig. 3 start signal decision circuitry.
Embodiment
Below by a case study on implementation, further specify the present invention.
At first a high magnetic steel is installed, over against magnet steel magnetoelectric tachometric transducer is installed and is realized the magnet steel signal measurement at diesel engine flywheel end or free end.Each working cycle of (see figure 1) four-cycle diesel takes two turns, so two sine wave signals of each working cycle magnetoelectric tachometric transducer output, through carrying out signal Processing behind the RC filtering circuit.The sine wave signal process converts sine wave signal to the square-wave signal of same frequency by the comparator circuit that operational amplifier constitutes.Constitute comparator circuit by the LM358 operational amplifier.Amplifier is come usefulness as comparer, and inverting input connects sine wave signal, homophase termination comparison signal.(see figure 3)
Square-wave signal is realized the two divided-frequency of signal through double D trigger.Described frequency-halving circuit is the CD4013 trigger, and trigger has independently data, set, resets, the clock input and output.This device can be used as shift register, and by Q output is connected to the data input, can be used as counter and trigger.When rising edge clock triggered, the logic level that is added in the D input end was sent to the Q output terminal.Set and reset and clock irrelevant, and finish by the high level on set or the reset line respectively.So just can obtain each working cycle is that bent axle changes the next square-wave signal of 2 circle situations, and then the rising edge signal that passes through square wave carries out signals collecting as judgement, and is simple and practical.
Claims (3)
1. four-cycle diesel signals collecting starting point determination methods is characterized in that: may further comprise the steps:
1), a high magnetic steel is installed on described crankshaft of diesel engine flywheel disk, the magnetoelectric tachometric transducer of being installed by the high magnetic steel opposite obtains the magnet steel signal: each working cycle of diesel engine takes two turns, then two sine wave signals of magnetoelectric tachometric transducer output;
2), the comparator circuit of sine wave signal through constituting by operational amplifier, sine wave signal is converted to the square-wave signal of same frequency; Amplifier is come usefulness as comparer, and inverting input connects sine wave signal, homophase termination comparison signal;
3), square-wave signal is through double D trigger, realize the two divided-frequency of signal, when rising edge clock triggers, the logic level that is added in the D input end is sent to the Q output terminal, can obtain each working cycle is that bent axle changes the next square-wave signal of 2 circle situations, then the rising edge signal that passes through square wave carries out signals collecting as judgement.
2. determination methods according to claim 1 is characterized in that: described frequency-halving circuit is the CD4013 trigger, and trigger has independently data, set, resets, the clock input and output.
3. determination methods according to claim 1 is characterized in that: constitute comparator circuit by the LM358 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101046038A CN102081011B (en) | 2010-02-02 | 2010-02-02 | Method for judging signal-acquisition initial point for four-stroke diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101046038A CN102081011B (en) | 2010-02-02 | 2010-02-02 | Method for judging signal-acquisition initial point for four-stroke diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102081011A true CN102081011A (en) | 2011-06-01 |
| CN102081011B CN102081011B (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101046038A Expired - Fee Related CN102081011B (en) | 2010-02-02 | 2010-02-02 | Method for judging signal-acquisition initial point for four-stroke diesel engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511110A (en) * | 2013-09-18 | 2014-01-15 | 潍柴动力股份有限公司 | Method and system for detecting installation position of revolution speed transducer |
| CN104279063A (en) * | 2013-07-08 | 2015-01-14 | 博世（中国）投资有限公司 | Method for controlling engine to operate and engine control system |
-
2010
- 2010-02-02 CN CN2010101046038A patent/CN102081011B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279063A (en) * | 2013-07-08 | 2015-01-14 | 博世（中国）投资有限公司 | Method for controlling engine to operate and engine control system |
| CN103511110A (en) * | 2013-09-18 | 2014-01-15 | 潍柴动力股份有限公司 | Method and system for detecting installation position of revolution speed transducer |
| CN103511110B (en) * | 2013-09-18 | 2015-11-18 | 潍柴动力股份有限公司 | A kind of method and system detecting speed probe mounting point |
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| Publication number | Publication date |
|---|---|
| CN102081011B (en) | 2011-12-21 |
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