CN111478673B - Signal conditioning circuit of wheel speed sensor - Google Patents
Signal conditioning circuit of wheel speed sensor Download PDFInfo
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- CN111478673B CN111478673B CN202010321713.3A CN202010321713A CN111478673B CN 111478673 B CN111478673 B CN 111478673B CN 202010321713 A CN202010321713 A CN 202010321713A CN 111478673 B CN111478673 B CN 111478673B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
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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
- G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Regulating Braking Force (AREA)
Abstract
The embodiment of the invention discloses a signal conditioning circuit of a wheel speed sensor, which comprises: a first non-inverting input end of an amplifier in the amplifying sub-circuit is connected to a signal input end through resistors R102 and R103, one end of the resistor R102 is grounded through a capacitor C3 and a resistor R109, one end of the capacitor C3 is connected to a first inverting input end through a resistor R108, the first inverting input end is connected to a first output end through a capacitor C4, and the first inverting input end is connected to an output end of the amplifying sub-circuit through resistors R112 and R113; the second in-phase input end of the amplifier in the output end filtering sub-circuit is coupled, the second in-phase input end is grounded through a capacitor C2, and the second reverse input end is connected with the second output end of the amplifier. The embodiment of the invention solves the problem that the wheel speed sensor is limited by structure and size, the output amplitude value is saturated, and the requirement of higher anti-interference capability provided by a brake control system cannot be met.
Description
Technical Field
The application relates to but not limited to aircraft brake sensor technical field that tests the speed, indicates a signal conditioning circuit of wheel speed sensor especially.
Background
With the technical application of the electronic anti-skid brake system becoming mature, a large number of airplanes are provided with the system at present, the wheel speed sensor is used as an important component of the electronic anti-skid brake system and is used for sensing the speed of the wheels and generating a frequency signal which is in direct proportion to the wheel speed signal and transmitting the frequency signal to the controller, and the controller determines whether to brake according to the frequency signal, so that the quality and the measurement accuracy of the wheel speed sensor are obviously important to the normal work of the brake system.
Along with the gradual promotion of automatic anti-skidding braking system demand, the interference killing feature to wheel speed signal requires more and more high, nevertheless because of the installation space of the fast sensor of excitation formula wheel is limited, the magnetic flux variation in its magnetic circuit has reached the saturation, no matter change the better magnetic material of magnetism, or increase ampere of turns, increase magnetic field intensity, all can't improve output amplitude. That is to say, because of structure and size restriction, the excitation wheel speed sensor output amplitude that the present technology is mature has reached saturation, can't satisfy the higher interference killing feature requirement that brake control system provided.
Disclosure of Invention
In order to solve the above technical problems, an embodiment of the present invention provides a signal conditioning circuit for a wheel speed sensor, so as to solve the problem that the existing excitation wheel speed sensor is limited by structure and size, and the variation of magnetic flux in a magnetic circuit of the excitation wheel speed sensor is saturated, so that the output amplitude of the excitation wheel speed sensor is saturated, and thus the requirement of a brake control system for higher anti-interference capability cannot be met.
The embodiment of the invention provides a signal conditioning circuit of a wheel speed sensor, which is characterized by comprising: an amplifying sub-circuit and a filtering sub-circuit;
the amplification sub-circuit comprises an operational amplifier and a peripheral circuit, wherein a first non-inverting input end of the operational amplifier is coupled with an output end of the wheel speed sensor through a resistor (R102) and a resistor (R103) which are connected in series and is used for inputting a sine wave signal output by the wheel speed sensor; one end of a resistor (R102) connected with a resistor (R103) is grounded through a capacitor (C3) and a resistor (R109), one end of the capacitor (C3) connected with the resistor (R109) is connected to a first inverting input end of an operational amplifier through a resistor (R108), the first inverting input end of the operational amplifier is connected to a first output end of the operational amplifier through a capacitor (C4), a capacitor (R104) is connected between the first output end and an output end of an amplification sub-circuit, and the first inverting input end is further connected to the output end of the amplification sub-circuit through a resistor (R112) and an adjusting resistor (R113) which are connected in series; the amplifying sub-circuit is used for adjusting the amplifying coefficient of the amplifying sub-circuit through an adjusting resistor (R113);
the filter sub-circuit comprises a same-proportion amplifier and a resistor-capacitor network, the output end of the amplifier sub-circuit is coupled with the second in-phase input end of the same-proportion amplifier through a capacitor (R105) and a capacitor (R106), the second in-phase input end is grounded through a capacitor (C2), the second reverse input end of the same-proportion amplifier is connected with the second output end of the same-proportion amplifier, and one end of the resistor (R105) connected with the resistor (R106) is connected to the second output end through a capacitor (C1).
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, the operational amplifier in the amplifying sub-circuit is an inverting amplifier.
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, the adjusting resistor (R113) in the amplifying sub-circuit is configured to adjust the amplification factor according to the output amplitude of the product coil.
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, the amplification factor of the amplification sub-circuit is:
wherein A' is the amplification factor of the amplifier sub-circuit, R 112 Is the resistance value of a resistor (R112), R 113* For adjusting the resistance value of the resistor (R113), R 108 Is the resistance value of the resistor (R108), R 109 Is the resistance value of the resistor (R109).
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, the amplifying sub-circuit further includes: the first non-inverting input end is grounded through a resistor (R110) and a resistor (R111) which are connected in series, and the resistor (R110) and the resistor (R111) which are connected in series are connected with a resistor (R102) and a resistor (R103) which are connected in series in parallel;
the resistor (R110) and the resistor (R111) are used for eliminating offset generated at the first output end due to bias current of the operational amplifier.
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, the frequency of the output signal transmitted by the wheel speed sensor to the amplifying sub-circuit is less than or equal to 5kHz, and the filtering sub-circuit is a 10kHz filter.
Optionally, in the signal conditioning circuit of the wheel speed sensor as described above, in the resistor-capacitor network of the filtering sub-circuit,
R 105 ＝R 106 ，
wherein R is 105 Is the resistance value of a resistor (R105), R 106 Is the resistance value of the resistor (R106), C 1 Is the capacitance of the capacitor (C1), C 2 The capacitance of the capacitor (C2).
Optionally, in the signal conditioning circuit of the wheel speed sensor, the resistors in the signal conditioning circuit are all metal film resistors, and all the resistors have a precision of 1%, and the capacitors all adopt ceramic dielectric capacitors.
The signal conditioning circuit of the airplane wheel speed sensor provided by the embodiment of the invention overcomes the defect that the amplitude of the sine wave signal output by the conventional airplane wheel speed sensor is low (usually less than 1V), can amplify the output sine wave signal in proportion according to the requirement of a brake control unit, and ensures the accuracy of signal acquisition of the brake control unit. In addition, the amplification factor in the signal conditioning circuit of the embodiment of the invention is adjustable, and the resistance value of the adjusting resistor (R113) can be changed according to the output amplitude of the actual sensor and the requirement of the brake control unit so as to obtain the required output amplitude.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a signal conditioning circuit of a wheel speed sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal conditioning circuit of another wheel speed sensor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As described in the above background art, since the installation space of the excitation wheel speed sensor is limited, the amount of change of the magnetic flux in the magnetic circuit is saturated, and the output amplitude cannot be increased no matter the magnetic material with better magnetism is replaced or the ampere-turn number is increased to increase the magnetic field strength. Therefore, a new signal amplitude adjustment method needs to be provided, for example, an amplification circuit is added at the signal output end of the wheel speed sensor, so as to control the output amplitude of the sensor by an amplification factor, and adjust the output amplitude to an appropriate amplitude interval according to the system requirements.
In addition, it is also explained in the above background art that, due to the structural and size limitations, the output amplitude of the excitation wheel speed sensor in the current mature technology is saturated, and the requirement of higher anti-interference capability provided by the brake control system cannot be met. Therefore, in order to increase the output amplitude of the wheel speed sensor, it is necessary to design an amplifying circuit capable of adjusting the amplitude of the output signal. The amplifying circuit can be arranged in the wheel speed sensor to directly amplify and filter signals.
In the double-section type four-redundancy airplane wheel speed sensor provided in the prior art, the principle of the airplane wheel speed sensor is mechanical transmission, a rotor assembly in the sensor is driven, magnetic fields with different intensities are generated through a magnetoelectric effect, and sine waves corresponding to rotating speeds are output. In the technical scheme, the wheel speed sensor is of a fully-closed structure, but the double-section type four-redundancy wheel speed sensor provided by the technical scheme does not have signal conditioning and filtering capabilities.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a signal conditioning circuit of a wheel speed sensor according to an embodiment of the present invention. The signal conditioning circuit of the wheel speed sensor provided by the embodiment may include: an amplification sub-circuit 10 and a filtering sub-circuit 20.
As shown in fig. 1, the amplifying sub-circuit 10 in the embodiment of the present invention includes an operational amplifier and a peripheral circuit, a first non-inverting input terminal of the operational amplifier is coupled to an output terminal of the wheel speed sensor through a resistor (R102) and a resistor (R103) connected in series, one end of the resistor (R102) connected to the resistor (R103) is grounded through a capacitor (C3) and a resistor (R109), one end of the capacitor (C3) connected to the resistor (R109) is connected to a first inverting input terminal of the operational amplifier through a resistor (R108), the first inverting input terminal of the operational amplifier is connected to a first output terminal thereof through a capacitor (C4), a capacitor (R104) is connected between the first output terminal and an output terminal of the amplifying sub-circuit, and the first inverting input terminal is further connected to the output terminal of the amplifying sub-circuit through a resistor (R112) and an adjusting resistor (R113) connected in series.
In practical applications, one end (port 4) of the operational amplifier of the amplifying sub-circuit 10 is connected to the power supply voltage VCC, and the other end (port 8) is grounded.
The filter sub-circuit 20 in the embodiment of the present invention includes a scaling amplifier and a resistor-capacitor network, an output terminal of the amplifier sub-circuit is coupled to a second non-inverting input terminal of the scaling amplifier through a capacitor (R105) and a capacitor (R106), the second non-inverting input terminal is grounded through a capacitor (C2), a second inverting input terminal of the scaling amplifier is connected to a second output terminal of the scaling amplifier, and a terminal of the resistor (R105) connected to the resistor (R106) is connected to the second output terminal through a capacitor (C1).
The embodiment of the invention provides an amplifying circuit (namely a signal conditioning circuit) of an alternating current analog signal in a wheel speed sensor, which consists of an amplifying sub-circuit 10 and a filtering sub-circuit 20. Wherein, the signal amplifying part (amplifying sub-circuit 10) is composed of an integrated operational amplifier and a peripheral circuit; the filtering sub-circuit 20 is composed of a proportional amplifier and a resistor-capacitor network.
The signal conditioning circuit for the airplane wheel speed sensor provided by the embodiment of the invention utilizes the operational amplification circuit and the second-order filter circuit, so that a sine wave signal amplified in proportion to the input end stroke is obtained at the output end.
According to the signal conditioning circuit of the wheel speed sensor provided by the embodiment of the invention, on the basis of the structure of the existing excitation type wheel speed sensor, the signal conditioning circuit is added at the lead-out wire end of the coil assembly and is used for adjusting the generated sine wave signal.
The design function of the signal conditioning circuit provided by the embodiment of the invention is divided into two parts, including an amplifying sub-circuit 10 and a filtering sub-circuit 20.
The amplifier sub-circuit 10 adopts the principle of an inverting amplifier, that is, the operational amplifier is an inverting amplifier; in addition, the amplifying sub-circuit 10 is designed with an adjusting resistor (R113), which can adjust the amplifying coefficient according to the requirement and the specific output amplitude of the product coil.
The filter sub-circuit 20 in the embodiment of the present invention is composed of a proportional amplifier and a resistor-capacitor network, and by using the low-pass filtering principle, the frequency of the output signal of the general excitation wheel speed sensor is not higher than 5kHz, and considering the attenuation of the characteristic curve of the filter, the filter can be designed as a 10kHz filter.
Optionally, fig. 2 is a schematic structural diagram of a signal conditioning circuit of another wheel speed sensor according to an embodiment of the present invention. Based on the structure of the signal conditioning circuit shown in fig. 1, the amplifying sub-circuit 10 in the embodiment of the present invention further includes: the first non-inverting input end is grounded through a resistor (R110) and a resistor (R111) which are connected in series, and the resistor (R110) and the resistor (R111) which are connected in series are connected with the resistor (R102) and the resistor (R103) which are connected in series in parallel.
In the amplifying sub-circuit, the resistor (R110) and the resistor (R111) are designed to cancel an offset generated at the first output terminal due to a bias current of the operational amplifier. It should be noted that, since the operational amplifier inevitably has a bias current, which affects the amplified signal, R110+ R111 needs to be designed at the first non-inverting input terminal to balance the bias, so as to eliminate the offset generated at the first output terminal due to the bias current of the operational amplifier.
In practical applications, in the signal conditioning circuit shown in fig. 1 and 2, R113 is an adjusting resistor, and the amplification factor can be adjusted according to the output of the product coil; the resistor R108, the resistor R109, the resistor R112 and the adjusting resistor R113 form a signal sampling amplifying circuit, and an amplifying coefficient A' is calculated by the following formula:
wherein A' is the amplification factor of the amplifier sub-circuit, R 112 Is the resistance value of a resistor (R112), R 113* For adjusting the resistance value of the resistor (R113), R 108 Is the resistance value of the resistor (R108), R 109 Is the resistance value of the resistor (R109).
As shown in fig. 1 and fig. 2, J1 is a signal input terminal, and after passing through an operational amplifier, the signal is amplified to 2 times of the original signal according to a designed amplification scale factor; the resistor R105, the resistor R106, the capacitors C1, C2 and the amplifier (1,
R 105 ＝R 106 ，
wherein R is 105 Is the resistance value of the resistor (R105), R 106 Is the resistance value of the resistor (R106), C 1 Is the capacitance of a capacitor (C1), C 2 The capacitance of the capacitor (C2). And obtaining a wheel speed signal with adjustable scale factor amplification after signal amplification and filtering. The whole signal conditioning circuit is simple and reliable, and the resistors in the signal conditioning circuit are all metal film resistors with the precision of 1 percent; the capacitor adopts ceramic dielectric capacitance, and has no polarity and high reliability.
The signal conditioning circuit of the wheel speed sensor provided by the embodiment of the invention overcomes the defect that the amplitude of the sine wave signal output by the conventional wheel speed sensor is low (generally less than 1V), can amplify the output sine wave signal in proportion according to the requirement of a brake control unit, and ensures the accuracy of signal acquisition of the brake control unit. In addition, the amplification factor in the signal conditioning circuit of the embodiment of the invention is adjustable, and the resistance value of the adjusting resistor (R113) can be changed according to the output amplitude of the actual sensor and the requirement of the brake control unit so as to obtain the required output amplitude.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A signal conditioning circuit for a wheel speed sensor, comprising: an amplifying sub-circuit and a filtering sub-circuit;
the amplification sub-circuit comprises an operational amplifier and a peripheral circuit, wherein a first non-inverting input end of the operational amplifier is coupled with an output end of the wheel speed sensor through a resistor (R102) and a resistor (R103) which are connected in series and used for inputting a sine wave signal output by the wheel speed sensor; one end of a resistor (R102) connected with a resistor (R103) is grounded through a capacitor (C3) and a resistor (R109), one end of the capacitor (C3) connected with the resistor (R109) is connected to a first inverting input end of an operational amplifier through a resistor (R108), the first inverting input end of the operational amplifier is connected to a first output end of the operational amplifier through a capacitor (C4), a capacitor (R104) is connected between the first output end and an output end of an amplification sub-circuit, and the first inverting input end is further connected to the output end of the amplification sub-circuit through a resistor (R112) and an adjusting resistor (R113) which are connected in series; the amplification sub-circuit is used for adjusting the amplification factor of the amplification sub-circuit through an adjusting resistor (R113);
the filter sub-circuit comprises a same-proportion amplifier and a resistor-capacitor network, the output end of the amplifier sub-circuit is coupled with the second in-phase input end of the same-proportion amplifier through a capacitor (R105) and a capacitor (R106), the second in-phase input end is grounded through a capacitor (C2), the second reverse input end of the same-proportion amplifier is connected with the second output end of the same-proportion amplifier, and one end of the resistor (R105) connected with the resistor (R106) is connected to the second output end through a capacitor (C1).
2. The signal conditioning circuit of a wheel speed sensor of claim 1, wherein the operational amplifier in the amplification sub-circuit is an inverting amplifier.
3. The wheel speed sensor signal conditioning circuit of claim 2, wherein the adjustment resistor (R113) in the amplification sub-circuit is configured to adjust the amplification factor according to the output amplitude of the product coil.
4. The wheel speed sensor signal conditioning circuit of claim 3, wherein the amplification factor of the amplification sub-circuit is:
wherein A' is the amplification factor of the amplifier sub-circuit, R 112 Is the resistance value of a resistor (R112), R 113* For adjusting the resistance value of the resistor (R113), R 108 Is the resistance value of a resistor (R108), R 109 Is the resistance value of the resistor (R109).
5. The signal conditioning circuit of a wheel speed sensor of claim 1, wherein the amplification sub-circuit further comprises: the first non-inverting input end is grounded through a resistor (R110) and a resistor (R111) which are connected in series, and the resistor (R110) and the resistor (R111) which are connected in series are connected with a resistor (R102) and a resistor (R103) which are connected in series in parallel;
the resistor (R110) and the resistor (R111) are used for eliminating the offset generated at the first output end due to the bias current of the operational amplifier.
6. The wheel speed sensor signal conditioning circuit of claim 1, wherein the frequency of the output signal transmitted by the wheel speed sensor to the amplification sub-circuit is less than or equal to 5 kilohertz (kHz), and the filtering sub-circuit is a 10kHz filter.
7. The wheel speed sensor signal conditioning circuit of claim 6, in a resistor-capacitor network of the filtering sub-circuit,
R 105 ＝R 106 ，
wherein R is 105 Is the resistance value of the resistor (R105), R 106 Is the resistance value of the resistor (R106), C 1 Is the capacitance of a capacitor (C1), C 2 The capacitance of the capacitor (C2).
8. The signal conditioning circuit of the wheel speed sensor according to any one of claims 1 to 7, wherein the resistors in the signal conditioning circuit are all metal film resistors, and are all 1% precision, and the capacitors are all ceramic dielectric capacitors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321713.3A CN111478673B (en) | 2020-04-22 | 2020-04-22 | Signal conditioning circuit of wheel speed sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321713.3A CN111478673B (en) | 2020-04-22 | 2020-04-22 | Signal conditioning circuit of wheel speed sensor |
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| CN111478673A CN111478673A (en) | 2020-07-31 |
| CN111478673B true CN111478673B (en) | 2023-03-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6657476B1 (en) * | 2002-07-09 | 2003-12-02 | Honeywell International Inc. | AC-coupled sensor signal conditioning circuit |
| CN202059390U (en) * | 2011-05-24 | 2011-11-30 | 华北电力大学 | Improved signal acquisition and conditioning circuit |
| CN204575671U (en) * | 2015-03-27 | 2015-08-19 | 西安航空制动科技有限公司 | A kind of change-over circuit of wheel spin-up transducer |
-
2020
- 2020-04-22 CN CN202010321713.3A patent/CN111478673B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6657476B1 (en) * | 2002-07-09 | 2003-12-02 | Honeywell International Inc. | AC-coupled sensor signal conditioning circuit |
| CN202059390U (en) * | 2011-05-24 | 2011-11-30 | 华北电力大学 | Improved signal acquisition and conditioning circuit |
| CN204575671U (en) * | 2015-03-27 | 2015-08-19 | 西安航空制动科技有限公司 | A kind of change-over circuit of wheel spin-up transducer |
Non-Patent Citations (1)
| Title |
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| 一种微小型增益可调调理电路的设计及实现;雷武等;《电子设计工程》;20200120(第02期);全文 * |
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