CN210954083U - Speed signal acquisition circuit, detection device and vehicle - Google Patents
Speed signal acquisition circuit, detection device and vehicle Download PDFInfo
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- CN210954083U CN210954083U CN201921958354.1U CN201921958354U CN210954083U CN 210954083 U CN210954083 U CN 210954083U CN 201921958354 U CN201921958354 U CN 201921958354U CN 210954083 U CN210954083 U CN 210954083U
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Abstract
The utility model discloses a speed of a motor vehicle signal acquisition circuit, detection device and vehicle, wherein this circuit includes: the sensor signal acquisition end is connected with a vehicle speed sensor to acquire a vehicle speed signal; the input end of the first filtering and comparing unit is connected with the signal acquisition end of the sensor, and the first filtering and comparing unit performs primary filtering on the vehicle speed signal to output a first pulse signal; the input end of the second filtering and comparing unit is connected with the output end of the first filtering and comparing unit, and the second filtering and comparing unit carries out secondary filtering on the first pulse signal so as to output a second pulse signal; and the input end of the shaping unit is connected with the output end of the second filtering and comparing unit, and the shaping unit outputs a switch pulse signal according to the second pulse signal, so that the processor acquires the vehicle speed by sampling the switch pulse signal, and the safety of the vehicle in the driving process is improved.
Description
Technical Field
The utility model relates to a circuit design technical field, in particular to speed of a motor vehicle signal acquisition circuit, an adoption speed of a motor vehicle signal detection device and an adoption of speed of a motor vehicle signal acquisition circuit speed of a motor vehicle signal detection device's vehicle.
Background
In the correlation technique, generally, the characteristic that the capacitor is connected with the alternating current and the direct current is utilized, the pulse signal output by the vehicle speed directly drives the triode to work after passing through the capacitor, so that the MCU identifies the vehicle speed state by detecting the duty ratio of the switching pulse output by the triode, but because the interference source on the vehicle is complex, the interference coupled in can also be coupled to the rear stage by the capacitor, the duty ratio is changed, the vehicle speed identified by the MCU is not consistent with the actual running vehicle speed or the pointer is jittered and unstable, and the like, so that certain potential safety hazards exist in the driving process, and the parameter selection of the adopted coupling capacitor is complex.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the above-mentioned technology to a certain extent. Therefore, the utility model aims to provide a speed of a motor vehicle signal acquisition circuit filters the comparison unit through increasing the two-stage, filters the interference clutter of the speed of a motor vehicle signal of gathering for the signal that detects output is more accurate stable, thereby improves the security of vehicle in the driving process.
A second object of the present invention is to provide a vehicle speed signal detecting device.
A third object of the present invention is to provide a vehicle.
In order to achieve the above object, an embodiment of the present invention provides a vehicle speed signal acquisition circuit, which includes a sensor signal acquisition end, wherein the sensor signal acquisition end is connected to a vehicle speed sensor to acquire a vehicle speed signal; the input end of the first filtering and comparing unit is connected with the signal acquisition end of the sensor, and the first filtering and comparing unit performs primary filtering on the vehicle speed signal to output a first pulse signal; the input end of the second filtering and comparing unit is connected with the output end of the first filtering and comparing unit, and the second filtering and comparing unit carries out secondary filtering on the first pulse signal so as to output a second pulse signal; and the input end of the shaping unit is connected with the output end of the second filtering and comparing unit, and the shaping unit outputs a switching pulse signal according to the second pulse signal so that the processor can obtain the vehicle speed by sampling the switching pulse signal.
According to the utility model provides a speed signal acquisition circuit, sensor signal acquisition end gather the speed signal, and first filtering comparison unit carries out the primary filtration to the speed signal in order to export first pulse signal, and second filtering comparison unit carries out the secondary filtration to first pulse signal in order to export second pulse signal, and the shaping unit exports switch pulse signal according to second pulse signal to the treater is through sampling switch pulse signal in order to acquire the speed; from this, through increasing the two-stage and filtering the comparison unit, filter the interference clutter of the speed of a motor vehicle signal of gathering for detect output's switch pulse signal is more accurate stable, thereby improves the security of vehicle in the driving process.
In addition, according to the utility model discloses speed of a motor vehicle signal acquisition circuit that above-mentioned embodiment provided can also have following additional technical characterstic:
optionally, the first filtering and comparing unit includes: a cathode of the first diode is used as an input end of the first filtering comparison unit; one end of the first resistor is connected with the anode of the first diode; the positive input end of the first operational amplifier comparator is connected with the other end of the first resistor, and the output end of the first operational amplifier comparator is used as the output end of the first filtering and comparing unit; one end of the second resistor is respectively connected with the cathode of the first diode and one end of the first resistor, and the other end of the second resistor is connected with a pull-up power supply; one end of the third resistor is connected with the other end of the first resistor and the positive input end of the first operational amplifier comparator respectively, and the other end of the third resistor is grounded; a cathode of the second diode is connected with one end of the third resistor, and an anode of the second diode is connected with the other end of the third resistor; one end of the fourth resistor is connected with a reference power supply, and the other end of the fourth resistor is connected with the negative input end of the first operational amplifier comparator; and one end of the fifth resistor is respectively connected with the other end of the fourth resistor and the negative input end of the first operational amplifier comparator, and the other end of the fifth resistor is grounded.
Optionally, the first filtering and comparing unit further includes: a first capacitor connected in parallel with the fifth resistor.
Optionally, the second filtering and comparing unit includes: one end of the sixth resistor is used as the input end of the second filtering comparison unit; a positive input end of the second operational amplifier comparator is connected with the other end of the sixth resistor, and an output end of the second operational amplifier comparator is used as an output end of the second filtering and comparing unit; one end of the seventh resistor is connected with one end of the sixth resistor, and the other end of the seventh resistor is grounded; a second capacitor connected in parallel with the seventh resistor; one end of the eighth resistor is connected with the other end of the sixth resistor and the positive input end of the second operational amplifier comparator respectively, and the other end of the eighth resistor is connected with a pull-up power supply; one end of the ninth resistor is connected with a reference power supply, and the other end of the ninth resistor is connected with the negative input end of the second operational amplifier comparator; and one end of the tenth resistor is connected with the other end of the ninth resistor and the negative input end of the second operational amplifier comparator respectively, and the other end of the tenth resistor is grounded.
Optionally, the second filtering and comparing unit further includes: a third capacitor connected in parallel with the tenth resistor.
Optionally, the shaping unit comprises: a base electrode of the first triode is connected with the output end of the second operational amplifier comparator, and an emitting electrode of the first triode is grounded; one end of the eleventh resistor is connected with a preset power supply, and the other end of the eleventh resistor is connected with a collector of the first triode; and one end of the twelfth resistor is connected with the other end of the eleventh resistor and the collector of the first triode respectively, and the other end of the twelfth resistor is used as the output end of the shaping unit.
In order to achieve the above object, a vehicle speed signal detecting device according to an embodiment of a second aspect of the present invention includes: a vehicle speed sensor; as the vehicle speed signal acquisition circuit, the vehicle speed signal acquisition circuit acquires the vehicle speed signal detected by the vehicle speed sensor and outputs the switching pulse signal; the speed sampling end of the processor is connected with the output end of the speed signal acquisition circuit, and the processor samples the switch pulse signal to obtain the speed of the vehicle.
According to the utility model provides a speed of a motor vehicle signal detection device, speed of a motor vehicle signal acquisition circuit is through gathering the speed of a motor vehicle signal that speed of a motor vehicle sensor detected to output switch pulse signal, the treater passes through sampling switch pulse signal in order to acquire the speed of a motor vehicle, from this, filters the interference clutter of the speed of a motor vehicle signal who gathers, makes the switch pulse signal who detects output more accurate stable, thereby improves the security of vehicle in the driving process.
In addition, according to the present invention, the vehicle speed signal detection device provided in the above embodiment may further have the following additional technical features:
optionally, the vehicle speed sensor is a hall sensor.
Optionally, the processor is an MCU.
In order to achieve the above object, a vehicle according to a third aspect of the present invention includes the vehicle speed signal detection device as described above.
According to the utility model provides a vehicle, through foretell speed of a motor vehicle signal detection device, filter the speed of a motor vehicle signal's of gathering interference clutter for detect the switch pulse signal of output more accurate stable, thereby improve the security of vehicle in the driving process.
Drawings
Fig. 1 is a schematic circuit diagram of a vehicle speed signal acquisition circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, a vehicle speed signal acquisition circuit according to an embodiment of the present invention includes a sensor signal acquisition end a, a first filtering and comparing unit 200, a second filtering and comparing unit 300, and a shaping unit 400;
the sensor signal acquisition end A is connected with a vehicle speed sensor 500 to acquire a vehicle speed signal.
According to an embodiment of the present invention, the vehicle speed sensor 500 may be a hall sensor.
The vehicle speed is sensed by the hall sensor, and a vehicle speed signal sensed by the hall sensor is acquired by the sensor signal acquisition end.
The input end of the first filtering and comparing unit 200 is connected with the signal acquisition end of the sensor, and the first filtering and comparing unit 200 performs primary filtering on the vehicle speed signal to output a first pulse signal.
Specifically, in an embodiment of the present invention, as shown in fig. 1, the first filtering and comparing unit 200 includes a first diode D1, a first resistor R1, a first operational amplifier comparator U1, a second resistor R2, a third resistor R3, a second diode D2, a fourth resistor R4, and a fifth resistor R5, wherein a cathode of the first diode D1 serves as an input terminal of the first filtering and comparing unit 200; one end of the first resistor R1 is connected to the anode of the first diode D1; the positive input end of the first operational amplifier comparator U1 is connected with the other end of the first resistor R1, and the output end of the first operational amplifier comparator U1 is used as the output end of the first filtering and comparing unit 200; one end of the second resistor R2 is respectively connected with the cathode of the first diode D1 and one end of the first resistor R1, and the other end of the second resistor R2 is connected with a pull-up power supply; one end of a third resistor R3 is respectively connected with the other end of the first resistor R1 and the positive input end of the first operational amplifier comparator U1, and the other end of the third resistor R3 is grounded; a cathode of the second diode D2 is connected to one end of the third resistor R3, and an anode of the second diode D2 is connected to the other end of the third resistor R3; one end of a fourth resistor R4 is connected with a reference power supply, and the other end of the fourth resistor R4 is connected with the negative input end of the first operational amplifier comparator U1; one end of the fifth resistor R5 is respectively connected with the other end of the fourth resistor R4 and the negative input end of the first operational amplifier comparator U1, and the other end of the fifth resistor R4 is grounded.
That is, the first filtering and comparing unit 200 is connected to the sensor signal collecting terminal to obtain the vehicle speed signal, and filters the low-amplitude interference source of the vehicle speed signal, thereby outputting the first pulse signal.
As an example, as shown in fig. 2, when the vehicle speed signal is low, the first diode D1 is turned on, and the voltage drop of the first diode D1 is 0.6V, and after current-limiting and voltage-dividing through the first resistor R1 and the third resistor R3, the voltage enters the positive input terminal of the first operational amplifier comparator U1, and after filtering through the fourth resistor R4 and the 12V reference power supply, the voltage enters the negative input terminal of the first operational amplifier comparator U1, the operational amplifier comparator U1 compares the voltages of the positive input terminal and the negative input terminal, and at this time, since the voltage of the positive input terminal is less than the voltage of the negative input terminal, the output terminal of the operational amplifier comparator U1 is low; if the vehicle speed signal is at a high level, the first diode D1 is turned off, the 12V pull-up power source passes through the second resistor R2, enters the positive input end of the first operational amplifier comparator U1 after being subjected to current limiting and voltage dividing through the first resistor R1 and the third resistor R3, and the 12V reference power source enters the negative input end of the first operational amplifier comparator U1 after being subjected to filtering through the fourth resistor R4, the operational amplifier comparator U1 compares the voltages of the positive input end and the negative input end, and at this time, because the voltage of the positive input end is greater than the voltage of the negative input end, the output end of the operational amplifier comparator U1 is at a high level; so that the first pulse signal in phase with the input is output after the comparison filtering of the first op amp comparator U1.
Further, the first filtering comparison unit further includes a first capacitor C1, and the first capacitor C1 is connected in parallel with the fifth resistor R5.
It should be noted that the reference power source is filtered by the first capacitor C1.
The input end of the second filtering and comparing unit 300 is connected to the output end of the first filtering and comparing unit 200, and the second filtering and comparing unit 300 performs a secondary filtering on the first pulse signal to output a second pulse signal.
Specifically, in an embodiment of the present invention, as shown in fig. 1, the second filtering and comparing unit 300 includes a sixth resistor R6, a second operational amplifier comparator U2, a seventh resistor R7, a second capacitor C2, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, one end of the sixth resistor R6 is used as the input end of the second filtering and comparing unit 300, the positive input end of the second operational amplifier comparator U2 is connected to the other end of the sixth resistor R6, the output end of the second operational amplifier comparator U2 is used as the output end of the second filtering and comparing unit 300, one end of the seventh resistor R7 is connected to one end of the sixth resistor R6, the other end of the seventh resistor R7 is grounded, the second capacitor C2 is connected to the seventh resistor R7 in parallel, one end of the eighth resistor R8 is connected to the other end of the sixth resistor R6 and the positive input end of the second operational amplifier comparator U2, and the other end of the eighth resistor R8 is connected to the power supply, one end of a ninth resistor R9 is connected with a reference power supply, the other end of the ninth resistor R9 and the negative input end of the second operational amplifier comparator U2 are connected with one end of a tenth resistor R10, the other end of the ninth resistor R9 and the negative input end of the second operational amplifier comparator U2 are connected with each other, and the other end of the tenth resistor R10 is grounded.
That is, the second filtering and comparing unit 300 is connected to the output end of the first filtering and comparing unit 200 to obtain the first pulse signal, and filters the low-amplitude interference source outputting the first pulse signal, thereby outputting the second pulse signal.
As an embodiment, as shown in fig. 2, when the output end of the operational amplifier comparator U1 is at a low level, the output end of the operational amplifier comparator U2 enters the positive input end of the second operational amplifier comparator U2 after being filtered and divided by the second capacitor C2 and the sixth resistor R6, and the reference power enters the negative input end of the second operational amplifier comparator U2 after being filtered by the ninth resistor R9, the operational amplifier comparator U2 compares the voltages of the positive input end and the negative input end, and at this time, since the voltage of the positive input end is smaller than the voltage of the negative input end, the output end of the operational amplifier comparator U2 is at a low level; if the output end of the operational amplifier comparator U1 is at a high level, the voltage is filtered and divided by a second capacitor C2 and a sixth resistor R6, the voltage enters the positive input end of the second operational amplifier comparator U2, the reference power passes through a ninth resistor R9 and is filtered, the voltage enters the negative input end of the second operational amplifier comparator U2, the voltage of the positive input end and the voltage of the negative input end are compared by the operational amplifier comparator U2, and at the moment, the voltage of the positive input end is greater than the voltage of the negative input end, so that the output end of the operational amplifier comparator U2 is at a high level; so that a second pulse signal in phase with the input is output after the comparison filtering of the second op-amp comparator U2.
Further, the first filtering comparison unit further includes a third capacitor C3, and the third capacitor C3 is connected in parallel with the tenth resistor R10.
It should be noted that the reference power source is filtered by the third capacitor C3.
Wherein, the input end of the shaping unit 400 is connected to the output end of the second filtering and comparing unit 300, and the shaping unit 400 outputs the switching pulse signal according to the second pulse signal, so that the processor 500 obtains the vehicle speed by sampling the switching pulse signal.
Specifically, in an embodiment of the present invention, as shown in fig. 1, the shaping unit 400 includes a first triode Q1, an eleventh resistor R11, and a twelfth resistor R12, a base of the first triode Q1 is connected to an output terminal of the second operational amplifier U2, an emitter of the first triode Q1 is grounded, one end of the eleventh resistor R11 is connected to a preset power source, the other end of the eleventh resistor R11 is connected to a collector of the first triode Q3, one end of the twelfth resistor R12 is connected to the other end of the eleventh resistor R11 and the collector of the first triode Q1, and the other end of the twelfth resistor R12 serves as an output terminal of the shaping unit 400.
As an example, as shown in fig. 2, when the second pulse signal output by the output terminal of the second filtering and comparing unit 300 is at a low level, the first transistor Q1 is turned off, and the preset power source outputs a switching pulse signal through the eleventh resistor R11 and the twelfth resistor R12, so that the processor samples the switching pulse signal to obtain the vehicle speed; when the second pulse signal output by the output terminal of the second filtering and comparing unit 300 is at a high level, the first transistor Q1 is turned on, and outputs a switching pulse signal, so that the processor can obtain the vehicle speed by sampling the switching pulse signal.
In summary, according to the utility model provides a speed signal acquisition circuit, sensor signal acquisition end gather the speed signal, and first filtering comparison unit carries out the one-level filtration to the speed signal in order to output first pulse signal, and second filtering comparison unit carries out the second grade filtration to first pulse signal in order to output second pulse signal, and the shaping unit exports switch pulse signal according to second pulse signal to the treater is through sampling switch pulse signal in order to acquire the speed of a motor vehicle; from this, through increasing the two-stage and filtering the comparison unit, filter the interference clutter of the speed of a motor vehicle signal of gathering for detect output's switch pulse signal is more accurate stable, thereby improves the security of vehicle in the driving process.
In addition, as shown in fig. 1, the utility model discloses still provide a speed of a motor vehicle signal detection device, including speed sensor 100, as above-mentioned speed of a motor vehicle signal acquisition circuit and treater 500.
The vehicle speed signal acquisition circuit acquires a vehicle speed signal detected by the vehicle speed sensor 100 and outputs a switching pulse signal; the speed sampling end of the processor 500 is connected with the output end of the speed signal acquisition circuit, and the processor 500 samples the switch pulse signal to acquire the speed of the vehicle.
As an example, the vehicle speed sensor 100 is a hall sensor.
As an embodiment, the processor 500 is an MCU.
According to the utility model provides a speed of a motor vehicle signal detection device, speed of a motor vehicle signal acquisition circuit is through gathering the speed of a motor vehicle signal that speed of a motor vehicle sensor detected to output switch pulse signal, the treater passes through sampling switch pulse signal in order to acquire the speed of a motor vehicle, from this, filters the interference clutter of the speed of a motor vehicle signal who gathers, makes the switch pulse signal who detects output more accurate stable, thereby improves the security of vehicle in the driving process.
In addition, as shown in fig. 2, the present invention further provides a vehicle 1000, which includes the vehicle speed signal detection device 2000.
According to the utility model provides a vehicle, through foretell speed of a motor vehicle signal detection device, filter the speed of a motor vehicle signal's of gathering interference clutter for detect the switch pulse signal of output more accurate stable, thereby improve the security of vehicle in the driving process.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A vehicle speed signal acquisition circuit, comprising:
the sensor signal acquisition end is connected with a vehicle speed sensor to acquire a vehicle speed signal;
the input end of the first filtering and comparing unit is connected with the signal acquisition end of the sensor, and the first filtering and comparing unit performs primary filtering on the vehicle speed signal to output a first pulse signal;
the input end of the second filtering and comparing unit is connected with the output end of the first filtering and comparing unit, and the second filtering and comparing unit carries out secondary filtering on the first pulse signal so as to output a second pulse signal;
and the input end of the shaping unit is connected with the output end of the second filtering and comparing unit, and the shaping unit outputs a switching pulse signal according to the second pulse signal so that the processor can obtain the vehicle speed by sampling the switching pulse signal.
2. The vehicle speed signal acquisition circuit according to claim 1, wherein the first filtering and comparing unit includes:
a cathode of the first diode is used as an input end of the first filtering comparison unit;
one end of the first resistor is connected with the anode of the first diode;
the positive input end of the first operational amplifier comparator is connected with the other end of the first resistor, and the output end of the first operational amplifier comparator is used as the output end of the first filtering and comparing unit;
one end of the second resistor is respectively connected with the cathode of the first diode and one end of the first resistor, and the other end of the second resistor is connected with a pull-up power supply;
one end of the third resistor is connected with the other end of the first resistor and the positive input end of the first operational amplifier comparator respectively, and the other end of the third resistor is grounded;
a cathode of the second diode is connected with one end of the third resistor, and an anode of the second diode is connected with the other end of the third resistor;
one end of the fourth resistor is connected with a reference power supply, and the other end of the fourth resistor is connected with the negative input end of the first operational amplifier comparator;
and one end of the fifth resistor is respectively connected with the other end of the fourth resistor and the negative input end of the first operational amplifier comparator, and the other end of the fifth resistor is grounded.
3. The vehicle speed signal acquisition circuit according to claim 2, wherein the first filtering and comparing unit further comprises:
a first capacitor connected in parallel with the fifth resistor.
4. A vehicle speed signal acquisition circuit according to any one of claims 1 to 3, wherein the second filtering comparison unit includes:
one end of the sixth resistor is used as the input end of the second filtering comparison unit;
a positive input end of the second operational amplifier comparator is connected with the other end of the sixth resistor, and an output end of the second operational amplifier comparator is used as an output end of the second filtering and comparing unit;
one end of the seventh resistor is connected with one end of the sixth resistor, and the other end of the seventh resistor is grounded;
a second capacitor connected in parallel with the seventh resistor;
one end of the eighth resistor is connected with the other end of the sixth resistor and the positive input end of the second operational amplifier comparator respectively, and the other end of the eighth resistor is connected with a pull-up power supply;
one end of the ninth resistor is connected with a reference power supply, and the other end of the ninth resistor is connected with the negative input end of the second operational amplifier comparator;
and one end of the tenth resistor is connected with the other end of the ninth resistor and the negative input end of the second operational amplifier comparator respectively, and the other end of the tenth resistor is grounded.
5. The vehicle speed signal acquisition circuit according to claim 4, wherein the second filtering and comparing unit further comprises:
a third capacitor connected in parallel with the tenth resistor.
6. The vehicle speed signal acquisition circuit according to claim 4, wherein the shaping unit includes:
a base electrode of the first triode is connected with the output end of the second operational amplifier comparator, and an emitting electrode of the first triode is grounded;
one end of the eleventh resistor is connected with a preset power supply, and the other end of the eleventh resistor is connected with a collector of the first triode;
and one end of the twelfth resistor is connected with the other end of the eleventh resistor and the collector of the first triode respectively, and the other end of the twelfth resistor is used as the output end of the shaping unit.
7. A vehicle speed signal detection device characterized by comprising:
a vehicle speed sensor;
the vehicle speed signal acquisition circuit according to any one of claims 1 to 6, which acquires a vehicle speed signal detected by the vehicle speed sensor and outputs a switching pulse signal;
the speed sampling end of the processor is connected with the output end of the speed signal acquisition circuit, and the processor samples the switch pulse signal to obtain the speed of the vehicle.
8. The vehicle speed signal detecting device according to claim 7, characterized in that the vehicle speed sensor is a hall sensor.
9. The vehicle speed signal detection device according to claim 7, wherein the processor is an MCU.
10. A vehicle characterized by comprising the vehicle speed signal detection device according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921958354.1U CN210954083U (en) | 2019-11-13 | 2019-11-13 | Speed signal acquisition circuit, detection device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921958354.1U CN210954083U (en) | 2019-11-13 | 2019-11-13 | Speed signal acquisition circuit, detection device and vehicle |
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| CN210954083U true CN210954083U (en) | 2020-07-07 |
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| CN201921958354.1U Active CN210954083U (en) | 2019-11-13 | 2019-11-13 | Speed signal acquisition circuit, detection device and vehicle |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |