CN114441796B - Magneto-electric type rotation speed sensor with self-checking function and PFM modulation output - Google Patents
Magneto-electric type rotation speed sensor with self-checking function and PFM modulation output Download PDFInfo
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- CN114441796B CN114441796B CN202210123752.1A CN202210123752A CN114441796B CN 114441796 B CN114441796 B CN 114441796B CN 202210123752 A CN202210123752 A CN 202210123752A CN 114441796 B CN114441796 B CN 114441796B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a magneto-electric rotation speed sensor with a self-checking function and PFM modulation output, wherein a sensor coil assembly of the sensor is respectively and electrically connected with a signal amplifying and filtering circuit and a broken wire detecting circuit; the signal amplifying and filtering circuit is electrically connected with the low-pass filter, the comparator, the pulse shaping and filtering circuit and the signal output driving circuit in sequence; the broken line detection circuit is electrically connected with the signal processing filter circuit, the signal processing filter circuit and the self-checking frequency generator are respectively electrically connected with the signal change-over switch, and the signal change-over switch is electrically connected with the self-checking signal output driving circuit. The invention has the advantages of high response speed, high detection precision, direct real-time monitoring of whether the sensor works normally or not through the self-checking signal, visual fault output, stable work, high measurement reliability and the like.
Description
[ field of technology ]
The invention relates to the field of sensors, in particular to a magneto-electric type rotation speed sensor with a self-checking function and PFM modulation output.
[ background Art ]
At present, no magneto-electric type rotating speed sensor has a coil self-checking function and PFM modulation output at the same time in domestic and foreign markets. As the magneto-electric type rotating speed sensor is in actual use, the working environment of the sensor is generally bad, and the front end coil probe is easy to break lines and other fault phenomena. At present, no sensor special for the magneto-electric type rotation speed sensor to perform line breakage on-line monitoring exists in the markets at home and abroad.
Although the existing magneto-electric rotating speed sensor part in the market also has a self-checking function, most of the magneto-electric rotating speed sensor part does not have an on-line monitoring function, and the rotating speed output signal of the product is easily influenced by the size of the tested sound wheel and the gap between the tested sound wheel and the sensor, so that the problem of inaccurate detection data and the like is caused.
[ invention ]
The invention aims to solve the technical problem of providing the magneto-electric type rotating speed sensor with the self-checking function and PFM modulation output, which has the advantages of high response speed, high detection precision, visual output, stable operation, high measurement reliability and the like, and whether the sensor works normally or not can be directly judged through a self-checking signal.
The invention is realized in the following way:
the hardware of the sensor comprises a sensor coil assembly, a signal amplifying and filtering circuit, a low-pass filter, a comparator, a pulse shaping and filtering circuit, a signal output driving circuit, a broken line detection circuit, a signal processing and filtering circuit, a self-checking frequency generator, a signal change-over switch and a self-checking signal output driving circuit,
the sensor coil assembly is electrically connected with the signal amplifying and filtering circuit and the broken wire detecting circuit respectively;
the signal amplifying and filtering circuit, the low-pass filter, the comparator, the pulse shaping and filtering circuit and the signal output driving circuit are electrically connected in sequence;
the broken line detection circuit is electrically connected with the signal processing filter circuit, the signal processing filter circuit and the self-checking frequency generator are respectively electrically connected with the signal change-over switch, and the signal change-over switch is electrically connected with the self-checking signal output driving circuit.
Further, the hardware of the sensor further comprises a power supply voltage-reducing and stabilizing circuit, wherein the power supply voltage-reducing and stabilizing circuit is electrically connected with the signal amplifying and filtering circuit, the low-pass filter, the comparator, the pulse shaping and filtering circuit, the signal output driving circuit, the broken line detection circuit, the signal processing and filtering circuit, the self-checking frequency generator, the signal change-over switch and the self-checking signal output driving circuit respectively.
The invention has the advantages that:
the magneto-electric type rotation speed sensor disconnection detection related functional module and the signal output module are provided with independent working modules, so that the function of online real-time monitoring can be realized in the use process of the sensor; the pulse shaping filter circuit is utilized to convert the rotating speed signal into the PFM pulse modulation mode for output, so that the signal pulse output waveform of the sensor is ensured not to be influenced by the size of the tested tone wheel and the gap between the tested tone wheel and the sensor, and the detection signal output of the sensor is ensured to be only positively correlated with the rotating speed frequency of the tested tone wheel. The sensor has the advantages of high response speed, high detection precision, visual output of whether the sensor works normally or not can be directly judged through self-checking signals by utilizing a pure hardware circuit design, stable work, high measurement reliability and the like, and fills the blank of the domestic market.
[ description of the drawings ]
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
FIG. 1 is one of the circuit connection block diagrams of a magneto-electric rotation speed sensor with self-checking function and PFM modulation output according to the present invention.
FIG. 2 is a second block diagram of the circuit connection of the magneto-electric speed sensor with self-test function and PFM modulation output according to the present invention.
The labels in the figures are as follows:
1-sensor coil assembly, 2-signal amplifying filter circuit, 3-low pass filter, 4-comparator, 5-pulse shaping filter circuit, 6-signal output drive circuit, 7-broken line detection circuit, 8-signal processing filter circuit, 9-self-checking frequency generator, 10-signal switch, 11-self-checking signal output drive circuit, 12-power supply voltage-reducing and stabilizing circuit
[ detailed description ] of the invention
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 2, the hardware of the magneto-electric rotation speed sensor with self-checking function and PFM modulation output of the present invention includes a sensor coil assembly 1, a signal amplifying and filtering circuit 2, a low-pass filter 3, a comparator 4, a pulse shaping and filtering circuit 5, a signal output driving circuit 6, a wire break detecting circuit 7, a signal processing and filtering circuit 8, a self-checking frequency generator 9, a signal switch 10 and a self-checking signal output driving circuit 11,
the sensor coil assembly 1 is electrically connected with the signal amplifying and filtering circuit 2 and the broken wire detecting circuit 7 respectively;
the signal amplifying and filtering circuit 2, the low-pass filter 3, the comparator 4, the pulse shaping and filtering circuit 5 and the signal output driving circuit 6 are electrically connected in sequence;
the disconnection detection circuit 7 is electrically connected with the signal processing filter circuit 8, the signal processing filter circuit 8 and the self-checking frequency generator 9 are respectively electrically connected with the signal change-over switch 10, and the signal change-over switch 10 is electrically connected with the self-checking signal output driving circuit 11.
In a preferred embodiment, the method comprises: the hardware of the sensor further comprises a power supply voltage-reducing and stabilizing circuit 12, wherein the power supply voltage-reducing and stabilizing circuit 12 is electrically connected with the signal amplifying and filtering circuit 2, the low-pass filter 3, the comparator 4, the pulse shaping and filtering circuit 5, the signal output driving circuit 6, the broken line detecting circuit 7, the signal processing and filtering circuit 8, the self-checking frequency generator 9, the signal switching switch 10 and the self-checking signal output driving circuit 11 respectively.
In another embodiment of the invention:
the magneto-electric rotation speed sensor mainly comprises a magnet, a shell, a backing ring, a sensor coil assembly, a circuit board, a connector and the like. The manufacturing process comprises the following steps: firstly, electronic components of circuit functional modules such as a signal amplifying filter circuit 2, a low-pass filter 3, a comparator 4, a pulse shaping filter circuit 5, a signal output driving circuit 6, a broken wire detection circuit 7, a signal processing filter circuit 8, a self-checking frequency generator 9, a signal change-over switch 10, a self-checking signal output driving circuit 11, a power supply voltage reducing and stabilizing circuit 12 and the like are welded on a circuit board through welding technologies such as SMT, and then the sensor coil assembly 1 is connected with the circuit board and assembled in corresponding shells to form a finished product.
The working principle of the invention is as follows:
the magneto-electric rotating speed sensor utilizes the working principle of variable reluctance, the sensor responds to the magnetic flux change of a magnetic circuit in the sensor by inducing the reluctance change caused by the change of the air gap between the gear teeth and the sensor when a detected target rotates, the magnetic flux change generates induced electromotive force at the sensor coil assembly 1 according to the law of electromagnetic induction, the signal amplification filter circuit 2 amplifies and filters the electric signal sensed by the front end sensor coil assembly 1, the amplified signal is converted into a corresponding pulse switching signal through the circuit of the comparator 4, the pulse shaping filter circuit 5 is converted into a pulse width fixed Pulse Frequency Modulation (PFM) signal, and finally the signal is subjected to amplitude adjustment and power amplification output through the signal output drive circuit 6.
The disconnection detecting circuit 7 controls the signal switching switch module by detecting the state of the sensor coil assembly 1 in operation, and determines whether the output of the self-test signal is a fixed level or a self-test signal having a specific frequency. The self-test signal is generated by a self-test frequency generator 9 circuit. Finally, the self-checking signal output driving circuit 11 can carry out amplitude change and power amplification output on the corresponding self-checking signal according to the product requirement.
The power supply step-down voltage stabilizing circuit 12 is used for converting an externally input direct-current power supply voltage into a working voltage required by each circuit module in the sensor during normal operation.
In summary, the magneto-electric type rotation speed sensor disconnection detection related functional module and the signal output module provided by the invention are provided with independent working modules, so that the function of online real-time monitoring can be realized in the use process of the sensor; the pulse shaping filter circuit is utilized to convert the rotating speed signal into the PFM pulse modulation mode for output, so that the signal pulse output waveform of the sensor is ensured not to be influenced by the size of the tested tone wheel and the gap between the tested tone wheel and the sensor, and the detection signal output of the sensor is ensured to be only positively correlated with the rotating speed frequency of the tested tone wheel. The sensor has the advantages of high response speed, high detection precision, visual output of whether the sensor works normally or not can be directly judged through self-checking signals by utilizing a pure hardware circuit design, stable work, high measurement reliability and the like, and fills the blank of the domestic market.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (2)
1. A magneto-electric rotation speed sensor with self-checking function and PFM modulation output is characterized in that: the hardware of the sensor comprises a sensor coil component, a signal amplifying filter circuit, a low-pass filter, a comparator, a pulse shaping filter circuit, a signal output driving circuit, a broken wire detection circuit, a signal processing filter circuit, a self-checking frequency generator, a signal change-over switch and a self-checking signal output driving circuit,
the sensor coil assembly is electrically connected with the signal amplifying and filtering circuit and the broken wire detecting circuit respectively;
the signal amplifying and filtering circuit, the low-pass filter, the comparator, the pulse shaping and filtering circuit and the signal output driving circuit are electrically connected in sequence;
the broken line detection circuit is electrically connected with the signal processing filter circuit, the signal processing filter circuit and the self-checking frequency generator are respectively electrically connected with the signal change-over switch, and the signal change-over switch is electrically connected with the self-checking signal output driving circuit;
the broken line detection circuit is switched according to a state control signal change-over switch of the sensor coil assembly in operation so as to determine whether the self-checking signal is a self-checking signal with a fixed level or a specific frequency.
2. The magnetoelectric revolution speed transducer with self-checking function and PFM modulation output as claimed in claim 1, wherein: the hardware of the sensor further comprises a power supply voltage-reducing and stabilizing circuit, wherein the power supply voltage-reducing and stabilizing circuit is electrically connected with the signal amplifying and filtering circuit, the low-pass filter, the comparator, the pulse shaping and filtering circuit, the signal output driving circuit, the broken line detection circuit, the signal processing and filtering circuit, the self-checking frequency generator, the signal change-over switch and the self-checking signal output driving circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123752.1A CN114441796B (en) | 2022-02-10 | 2022-02-10 | Magneto-electric type rotation speed sensor with self-checking function and PFM modulation output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123752.1A CN114441796B (en) | 2022-02-10 | 2022-02-10 | Magneto-electric type rotation speed sensor with self-checking function and PFM modulation output |
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| Publication Number | Publication Date |
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| CN114441796A CN114441796A (en) | 2022-05-06 |
| CN114441796B true CN114441796B (en) | 2023-09-19 |
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| CN202210123752.1A Active CN114441796B (en) | 2022-02-10 | 2022-02-10 | Magneto-electric type rotation speed sensor with self-checking function and PFM modulation output |
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| CN114441796A (en) | 2022-05-06 |
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