CN203216937U - Wide-range high-accuracy rotation speed measuring circuit - Google Patents
Wide-range high-accuracy rotation speed measuring circuit Download PDFInfo
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- CN203216937U CN203216937U CN 201320122557 CN201320122557U CN203216937U CN 203216937 U CN203216937 U CN 203216937U CN 201320122557 CN201320122557 CN 201320122557 CN 201320122557 U CN201320122557 U CN 201320122557U CN 203216937 U CN203216937 U CN 203216937U
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- rotation speed
- microprocessor
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Abstract
The utility model provides a wide-range high-accuracy rotation speed measuring circuit. A digital circuit comprising a wide-frequency electromagnetic inductive rotation speed sensor, a high-speed comparator, a resistor, a capacitor and a microprocessor is adopted. Signal filtering, compared shaping and an output rotation speed of a measured system are adopted to change a comparison value of the comparator output by the microprocessor, so that system measuring accuracy is improved, and the problem that the measured system can not be continuously measured from low speed to high speed is solved. The wide-range high-accuracy rotation speed measuring circuit has the advantages of simple circuit construction, economical and practical features, simplicity in integration, high measuring accuracy, wide measuring range and the like. The wide-range high-accuracy rotation speed measuring circuit is suitable for situations that rotation speed is accurately measured in a wide range during a procedure of controlling a mechanism needed to be controlled to rotate.
Description
Technical field
The utility model relates to a kind of tachometer circuit, specifically is a kind of wide region high precision tachometric survey circuit for the rotating mechanism of measuring high-speed cruising.
Background technology
In the small sized turbine jet engine operational process, the running speed per minute forwards to more than hundreds of thousands changes from tens, needs wide region, high-precision measurement rotational speed devices to measure its rotating speed.Most of magnetoelectric induction sensor that adopts is measured its rotating speed as measuring element at present.Though magnetoelectric induction sensor has advantages such as noncontact, strong interference immunity; But because of its induction rotating speed when more high signal output voltage more high, corresponding noise voltage is also just more high; Signal output voltage was low when rotating speed was low.Common tachometer circuit causes the speed error of measurement bigger when measuring rotating speed easily, and the measuring accuracy error of the more wide generation of measured scope is more big, causes that measurement range is narrower, precision is lower.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of wide region high-precision tachometric survey circuit, has solved the big and narrower problem of scope that tests the speed of measuring error that existing tachometer circuit exists.
The technical scheme that provides according to the utility model, described wide region high precision tachometric survey circuit comprises: the signal output part of speed probe connects an end of second resistor, an end of second electric capacity, an end of the 3rd electric capacity respectively, the 3rd electric capacity other end connects the inverting input of comparer and an end of the 7th resistor respectively, the other end of the 7th resistor connects the output terminal of comparer and the external interrupt mouth of microprocessor, and the positive input of comparer connects an end of the 5th resistor, an end of the 3rd resistor and an end of first resistor respectively; The 5th resistor other end is connected with the digital-to-analog conversion output terminal of microprocessor; The power end of one end of first resistor, an end of first capacitor and sensor is connected, the first resistor other end, the second resistor other end, the 3rd resistor other end all are connected with power supply, and the first capacitor other end, the 4th resistor other end, the second capacitor other end are connected with power supply ground.
Described microprocessor adopts embedded microprocessor.Described speed probe is the magnetoelectric induction speed probe.
The utility model has the advantages that:
1 the utility model circuit structure is simple, economical, it is integrated to be easy to.
2 the utility model circuit measuring precision height, the wide ranges that tests the speed, strong interference immunity.
3 the utility model circuit fiducial values can be regulated according to actual conditions, are fit to various speed probe circuit.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
The novel wide region high precision tachometric survey circuit that this circuit is made up of wideband magnetoelectric induction speed probe, high-speed comparator, resistor, capacitor, embedded microprocessor.
As shown in Figure 1, the signal output part of speed probe connects the end of the second resistor R2, an end of second capacitor C 2, an end of the 3rd capacitor C 3 respectively, be used for wideband magnetic induction speed probe on draw effect and signal carried out filtering, strengthen tach signal antijamming capability; The 3rd capacitor C 3 is used for the filtering of the noise signal of tach signal; The 3rd capacitor C 3 other ends connect the inverting input (input of tach signal) of comparer IC1 and the end of the 7th resistor R7 respectively, the other end of the 7th resistor R7 connects the output terminal of comparer IC1 and the external interrupt mouth INT of microprocessor IC2, is used for the interruption that tach signal triggers microprocessor; The positive input of comparer IC1 connects the end of the 5th resistor R5, the end of the 3rd resistor R3 and the end of the first resistor R4 respectively; The 5th resistor R5 other end is connected with the digital-to-analog conversion output terminal D/A of microprocessor IC2; Be used for microprocessor to the adjusting of comparer IC1 forward end signal; The end of the end of the first resistor R1, the first capacitor C1 and the power end of sensor are connected, the first resistor R1 other end, the second resistor R2 other end, the 3rd resistor R3 other end all are connected with power supply, and the first capacitor C1 other end, the 4th resistor R4 other end, the second capacitor C2 other end are connected with power supply ground.
The tach signal of speed probe output, because there is the function of pullup resistor R2 that the signal anti-interference is strengthened, carry out filtering through filter capacitor, regulate the comparing voltage value of D/A mouth output again according to the rate signal size of resolving out by microprocessor, thereby the height of regulating high-speed comparator limit signal end limits the spacing value of high-speed comparator IC1 (when the rotating speed in the system under test (SUT) is lower than when critical rotary speed is set, export lower fiducial value, when the rotating speed in the system under test (SUT) is higher than when critical rotary speed is set, the output HIGH voltage fiducial value), trigger output terminal output high-low level signal through high-speed comparator IC1, embedded microprocessor response external interrupt trigger signal is measured rotating speed, thereby has arrived high precision, wide region is measured rotating speed.
This shows, draw and the filtering data processing on the utility model employing output signal is carried out, solve and be subject to external interference, improve the measuring accuracy problem.Simultaneously, adopt the critical rotary speed of system under test (SUT) output, change the fiducial value of microprocessor output comparator, solved the continuous coverage problem from low speed to high speed of system under test (SUT).
In sum, wide region of the present utility model, high precision tachometric survey circuit have solved the big and narrower problem of the scope that tests the speed of the measuring error that tachometer circuit exists in the prior art; And can be widely used in the various measurement rotating speed modules.
Claims (3)
1. wide region high precision tachometric survey circuit, comprise speed probe, it is characterized in that: the signal output part of described speed probe connects an end of second resistor (R2) respectively, one end of second electric capacity (C2), one end of the 3rd electric capacity (C3), the 3rd electric capacity (C3) other end connects the inverting input of comparer (IC1) and an end of the 7th resistor (R7) respectively, the other end of the 7th resistor (R7) connects the output terminal of comparer (IC1) and the external interrupt mouth of microprocessor (IC2), and the positive input of comparer (IC1) connects an end of the 5th resistor (R5) respectively, one end of one end of the 3rd resistor (R3) and first resistor (R4); The 5th resistor (R5) other end is connected with the digital-to-analog conversion output terminal of microprocessor (IC2); One end of one end of first resistor (R1), first capacitor (C1) and the power end of sensor are connected, first resistor (R1) other end, second resistor (R2) other end, the 3rd resistor (R3) other end all are connected with power supply, and first capacitor (C1) other end, the 4th resistor (R4) other end, second capacitor (C2) other end are connected with power supply ground.
2. wide region high precision tachometric survey circuit according to claim 1 is characterized in that, described microprocessor (IC2) adopts embedded microprocessor.
3. wide region high precision tachometric survey circuit according to claim 1 is characterized in that described speed probe is the magnetoelectric induction speed probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320122557 CN203216937U (en) | 2013-03-18 | 2013-03-18 | Wide-range high-accuracy rotation speed measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320122557 CN203216937U (en) | 2013-03-18 | 2013-03-18 | Wide-range high-accuracy rotation speed measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203216937U true CN203216937U (en) | 2013-09-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320122557 Expired - Lifetime CN203216937U (en) | 2013-03-18 | 2013-03-18 | Wide-range high-accuracy rotation speed measuring circuit |
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| Country | Link |
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| CN (1) | CN203216937U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104952238A (en) * | 2015-06-15 | 2015-09-30 | 武汉合康动力技术有限公司 | Driving speed collection circuit based on RS422 chip |
| CN110784131A (en) * | 2019-10-31 | 2020-02-11 | 江苏科技大学 | Hall signal acquisition device and working method thereof |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
-
2013
- 2013-03-18 CN CN 201320122557 patent/CN203216937U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104952238A (en) * | 2015-06-15 | 2015-09-30 | 武汉合康动力技术有限公司 | Driving speed collection circuit based on RS422 chip |
| CN104952238B (en) * | 2015-06-15 | 2018-08-24 | 武汉合康动力技术有限公司 | One kind realizing speed data collection circuit based on RS422 chips |
| CN110784131A (en) * | 2019-10-31 | 2020-02-11 | 江苏科技大学 | Hall signal acquisition device and working method thereof |
| CN110784131B (en) * | 2019-10-31 | 2021-05-04 | 江苏科技大学 | Hall signal acquisition device and working method thereof |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |
|
| CX01 | Expiry of patent term |