CN105181991A - Engine speed measurement system - Google Patents
Engine speed measurement system Download PDFInfo
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- CN105181991A CN105181991A CN201510636288.6A CN201510636288A CN105181991A CN 105181991 A CN105181991 A CN 105181991A CN 201510636288 A CN201510636288 A CN 201510636288A CN 105181991 A CN105181991 A CN 105181991A
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Abstract
The invention relates to a speed measurement system and particularly to an engine speed measurement system. The system comprises an optical coupling module, a single-chip microcomputer module and an information output module which are connected one by one, a power module supplying power to the three modules, and a speed measurement disk which is fixed on the rotation shaft of the engine and has a small hole. The system adopts digital measurement, is high in measurement precision and simple in structure, supplies power to a vehicle-mount system, and has a wide application range.
Description
Technical field
The present invention relates to a kind of velocity-measuring system, be specifically related to a kind of engine velocity-measuring system.
Background technology
Conventional measurement of engine rotate speed system adopts electromagnetic induction principle, and produce different voltage or electric current according to the size of rotating speed, measurement result is analog quantity, be not easy process further and calculate, and when rotating speed occurs slightly to change, measurement result change is less, and measuring accuracy is low.In system, mimic channel is than great, complex structure, and price is high.
Summary of the invention
The object of the invention is to: provide a kind of measuring accuracy high, measurement result process is easy, the simple engine velocity-measuring system of mechanism.
The technical solution used in the present invention is as follows:
A kind of engine velocity-measuring system, comprise the optical coupler module, one-chip computer module, the message output module that connect successively, for the power module that former three is powered, be fixed on the narrow meshed tachometer disc on engine shaft, wherein, the light coupling relay of concave structure is included in optical coupler module, tachometer disc stretches in the concave structure of light coupling relay, when tachometer disc turns to certain angle, the light of the light-emitting component injection in light coupling relay is irradiated to by tachometer disc aperture on the light sensitive component in light coupling relay.
Concrete, optical coupler module includes a NPN triode Q1.
Concrete, optical coupler module structure is: the positive input terminal of optical relay U1 is connected to VCC by resistance R1, negative input end ground connection, and positive output end is connected VCC respectively by resistance R2 and is connected to the base stage of triode Q1 by resistance R4, negative output terminal ground connection; The collector of triode Q1 connects the emitter base of VCC, triode Q1 by resistance R3, and the collector of triode Q1 is connected to the I/O mouth of single-chip microcomputer as the output terminal of module.
Concrete, power module uses the voltage conversion chip of LM1173, can carry out the demand that voltage transformation meets velocity-measuring system to vehicle power.
When engine shaft rotates, drive tachometer disc rotation, when tachometer disc aperture is through the light transmission path of light coupling relay, light coupling relay closes, and electric signal exports after the amplifying circuit that triode Q1 is formed, and makes single-chip microcomputer receive high level, and light transmission path is when being blocked by tachometer disc, single-chip microcomputer receives level, and like this when engine rotation, optical coupler module sender wave pulse signal is received by single-chip microcomputer as digital signal.Be sent to message processing module after single-chip microcomputer computing result to export.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: adopt digitized measurement, measuring accuracy is high, structure is simple, and onboard system can be had to power, applied widely.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is systematic schematic diagram;
Fig. 2 is optically coupled circuit schematic diagram;
Fig. 3 is one-chip computer module circuit theory diagrams;
Fig. 4 is power module circuitry schematic diagram.
Embodiment
All features disclosed in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Below in conjunction with accompanying drawing, the present invention is elaborated.
A kind of engine velocity-measuring system, comprise the optical coupler module, one-chip computer module, the message output module that connect successively, for the power module that former three is powered, be fixed on the narrow meshed tachometer disc on engine shaft, it is characterized in that: the light coupling relay including concave structure in optical coupler module, tachometer disc stretches in the concave structure of light coupling relay, when tachometer disc turns to certain angle, the light of the light-emitting component injection in light coupling relay is irradiated to by tachometer disc aperture on the light sensitive component in light coupling relay.Optical coupler module includes a NPN triode Q1.Optical coupler module structure is: the positive input terminal of optical relay U1 is connected to VCC by resistance R1, negative input end ground connection, and positive output end is connected VCC respectively by resistance R2 and is connected to the base stage of triode Q1 by resistance R4, negative output terminal ground connection; The collector of triode Q1 connects the emitter base of VCC, triode Q1 by resistance R3, and the collector of triode Q1 is connected to the I/O mouth of single-chip microcomputer as the output terminal of module.Power module uses the voltage conversion chip of LM1173.
Claims (4)
1. an engine velocity-measuring system, comprise the optical coupler module, one-chip computer module, the message output module that connect successively, for the power module that former three is powered, be fixed on the narrow meshed tachometer disc on engine shaft, it is characterized in that: the light coupling relay including concave structure in optical coupler module, tachometer disc stretches in the concave structure of light coupling relay, when tachometer disc turns to certain angle, the light of the light-emitting component injection in light coupling relay is irradiated to by tachometer disc aperture on the light sensitive component in light coupling relay.
2. a kind of engine velocity-measuring system according to claim 1, is characterized in that: described optical coupler module includes a NPN triode Q1.
3. a kind of engine velocity-measuring system according to claim 2, it is characterized in that: described optical coupler module structure is: the positive input terminal of optical relay U1 is connected to VCC by resistance R1, negative input end ground connection, positive output end is connected VCC respectively by resistance R2 and is connected to the base stage of triode Q1 by resistance R4, negative output terminal ground connection; The collector of triode Q1 connects the emitter base of VCC, triode Q1 by resistance R3, and the collector of triode Q1 is connected to the I/O mouth of single-chip microcomputer as the output terminal of module.
4. a kind of engine velocity-measuring system according to claim 1, is characterized in that: described power module uses the voltage conversion chip of LM1173.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510636288.6A CN105181991A (en) | 2015-09-30 | 2015-09-30 | Engine speed measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510636288.6A CN105181991A (en) | 2015-09-30 | 2015-09-30 | Engine speed measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105181991A true CN105181991A (en) | 2015-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510636288.6A Pending CN105181991A (en) | 2015-09-30 | 2015-09-30 | Engine speed measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061217A (en) * | 2018-08-01 | 2018-12-21 | 上海理工大学 | Two-wire system optoelectronic sensor for wind speed circuit |
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2015
- 2015-09-30 CN CN201510636288.6A patent/CN105181991A/en active Pending
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061217A (en) * | 2018-08-01 | 2018-12-21 | 上海理工大学 | Two-wire system optoelectronic sensor for wind speed circuit |
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Application publication date: 20151223 |