CN106595465B - method and system for detecting air gap of wheel speed sensor - Google Patents

method and system for detecting air gap of wheel speed sensor Download PDF

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Publication number
CN106595465B
CN106595465B CN201611177063.XA CN201611177063A CN106595465B CN 106595465 B CN106595465 B CN 106595465B CN 201611177063 A CN201611177063 A CN 201611177063A CN 106595465 B CN106595465 B CN 106595465B
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China
Prior art keywords
wheel speed
air gap
speed sensor
level
sensor
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CN201611177063.XA
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Chinese (zh)
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CN106595465A (en
Inventor
陈伟
谢飞
常庆军
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G01B7/15—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures being regularly spaced
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • 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
    • G01P3/488—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 delivered by variable reluctance detectors
    • 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
    • G01P3/489—Digital circuits therefor

Abstract

The invention discloses a method and a system for detecting an air gap of a wheel speed sensor, wherein the method comprises the following steps: the method comprises the following steps of carrying out calibration on an air gap identification position of a wheel speed sensor in advance, wherein the calibration process comprises the following steps: providing a gear ring and a Hall sensor; after the Hall sensor is electrified, adjusting the distance between the gear ring and the Hall sensor to enable the Hall sensor to output square wave signals with high level and low level when the gear ring rotates; increasing the resistance value between the output end of the Hall sensor and the ground, so that the Hall sensor outputs square wave signals with high level, medium level and low level when the gear ring rotates; and selecting a middle level position which has consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as the air gap identification position of the wheel speed sensor. And during the working process of the wheel speed sensor, detecting the air gap of the wheel speed sensor according to the level of the air gap identification bit of the wheel speed sensor. The invention can automatically detect the air gap between the Hall sensor and the gear ring in the wheel speed sensor.

Description

Method and system for detecting air gap of wheel speed sensor
Technical Field
the invention relates to the technical field of electronic control, in particular to a method and a system for detecting an air gap of a wheel speed sensor.
background
the wheel speed sensor air gap refers to the minimum distance from the head of the sensor to the gear ring, as shown in fig. 1, which is a schematic structural diagram of a wheel speed sensor in the prior art, wherein L is an air gap. The size of the air gap is directly related to the identification of the signal of the wheel speed sensor, and the size of the air gap needs to be strictly regulated and controlled in design and manufacturing.
In order to measure the size of the air gap, the wheel end parts such as the tire, the rim, the brake drum and the like are usually removed, and then a test is performed by using a test tool such as a ruler and the like. The disassembling process and the recovering process are very complicated.
Disclosure of Invention
The invention provides a method and a system for detecting an air gap of a wheel speed sensor, which solve the problem that the wheel speed sensor needs to be disassembled for air gap testing in the prior art.
The invention provides a method for detecting an air gap of a wheel speed sensor, which comprises the following steps:
The method comprises the following steps of carrying out calibration on an air gap identification position of a wheel speed sensor in advance, wherein the calibration process comprises the following steps:
providing a gear ring and a Hall sensor, wherein the gear ring comprises a ring body and tooth parts uniformly distributed on the ring body;
After the Hall sensor is electrified, adjusting the distance between the gear ring and the Hall sensor to enable the Hall sensor to output square wave signals with high level and low level when the gear ring rotates;
Increasing the resistance value between the output end of the Hall sensor and the ground, so that the difference between the high level and the low level is increased, and the Hall sensor outputs square wave signals with the high level, the medium level and the low level when the gear ring rotates, wherein a plurality of medium levels exist between two adjacent high levels;
Selecting a middle level position which has consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as an air gap identification position of the wheel speed sensor;
And detecting whether the size of the air gap of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification bit of the wheel speed sensor in the working process of the wheel speed sensor.
Preferably, the method further comprises:
After the middle level is adjusted, the tooth portion is shaped so that the difference between the middle level and the high and low levels becomes large.
preferably, the shape of the adjusted teeth is: the clockwise surface shape and the counterclockwise surface shape are different.
preferably, the shape of the adjusted teeth is:
The surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane; or
The surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a convex surface; or
The surface shape in the clockwise direction is a plane, and the surface shape in the anticlockwise direction is a convex surface; or
The surface shape in the clockwise direction is an S-shaped cambered surface, and the surface shape in the anticlockwise direction is a plane.
Preferably, the shape of the teeth is: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane;
The step of selecting a middle level position with consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as the air gap identification position of the wheel speed sensor comprises the following steps:
determining the number of the middle levels between two adjacent high levels;
Setting a communication protocol, wherein the level of each middle level position corresponds to one byte in the communication protocol, and each byte represents the level of the level position, wherein the middle level corresponds to 1, and the low level corresponds to 0;
Rotating the gear ring, and comparing whether the size of each byte in a signal output by the sensor and the size of an air gap of the wheel speed sensor exceed a set threshold value or not;
if a byte corresponding to a certain middle level position is 0 when the air gap size of the wheel speed sensor exceeds a set threshold value, and the byte is 1 when the air gap size of the wheel speed sensor does not exceed the set threshold value, the byte can be used as an air gap identification bit of the wheel speed sensor;
and selecting one byte from the bytes which can be used as the air gap identification bit of the wheel speed sensor.
correspondingly, the invention also provides a system for detecting the air gap of the wheel speed sensor, which comprises the following components:
The circuit comprises a gear ring, a Hall sensor, a capacitor, a resistor, an electronic control unit and an adjusting resistor, wherein a radial extension line of a probe of the Hall sensor penetrates through the circle center of the gear ring and is positioned on the same plane with the gear ring;
the adjusting resistor is connected between the output end of the Hall sensor and the ground in series and used for increasing the resistance value between the output end of the Hall sensor and the ground, so that the difference value between a high level and a low level is increased, the Hall sensor outputs square wave signals with the high level, a medium level and the low level when the gear ring rotates, and the capacitor plays a filtering role, wherein a plurality of medium levels exist between two adjacent high levels;
the electronic control unit selects a middle level position which is consistent with the size of the air gap of the wheel speed sensor from positions corresponding to a plurality of middle levels of the received square wave signal as an air gap identification position of the wheel speed sensor, and then detects whether the size of the air gap of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification position of the wheel speed sensor, wherein the air gap of the wheel speed sensor is the air gap between the gear ring and the Hall sensor.
preferably, the ring gear includes: comprises a ring body and tooth parts uniformly distributed on the ring body;
the tooth portion is shaped so that the difference between the middle level and the high and low levels becomes large.
Preferably, the shape of the teeth is: the clockwise surface shape and the counterclockwise surface shape are different.
Preferably, the shape of the teeth is:
the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane; or
The surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a convex surface; or
the surface shape in the clockwise direction is a plane, and the surface shape in the anticlockwise direction is a convex surface; or
the surface shape in the clockwise direction is an S-shaped cambered surface, and the surface shape in the anticlockwise direction is a plane.
Preferably, the shape of the teeth is: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane;
The electronic control unit is specifically configured to:
in the setting process of the communication protocol: determining the number of the middle levels between two adjacent high levels; setting a byte for each middle level position, wherein each byte represents the level of the level position, the middle level corresponds to 1, and the low level corresponds to 0; when the gear ring rotates, comparing whether the size of each byte in a signal output by the Hall sensor and the size of the air gap of the wheel speed sensor exceed the consistency of a set threshold value, and determining the air gap identification position of the wheel speed sensor; wherein, the wheel speed sensor air gap identification position at least satisfies the following conditions: byte is 0 when the air gap size of the wheel speed sensor exceeds a set threshold, and is 1 when the air gap size of the wheel speed sensor does not exceed the set threshold;
in the process of detecting the air gap of the wheel speed sensor: the electronic control unit detects the air gap of the wheel speed sensor according to the value of the air gap identification position of the wheel speed sensor, wherein when the air gap identification position of the wheel speed sensor is 0, the air gap of the wheel speed sensor is abnormal in size; when the air gap identification position of the wheel speed sensor is 1, the air gap of the wheel speed sensor is normal.
the invention provides a method and a system for detecting an air gap of a wheel speed sensor. Specifically, in the process of calibrating the air gap identification position of the wheel speed sensor: providing a gear ring and a Hall sensor, wherein the gear ring comprises a ring body and tooth parts uniformly distributed on the ring body; after the Hall sensor is electrified, adjusting the distance between the gear ring and the Hall sensor to enable the Hall sensor to output square wave signals with high level and low level when the gear ring rotates; increasing the resistance value between the output end of the Hall sensor and the ground, so that the difference between the high level and the low level is increased, and the Hall sensor outputs square wave signals with the high level, the medium level and the low level when the gear ring rotates, wherein a plurality of medium levels exist between two adjacent high levels; and selecting a middle level position which has consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as the air gap identification position of the wheel speed sensor. In the process of detecting the air gap of the wheel speed sensor: and detecting whether the air gap size of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification bit of the wheel speed sensor. In the prior art, a gear ring and a Hall sensor are generally adopted to acquire rotating speed information, but the rotating speed information cannot be detected whether the air gap of a wheel speed sensor exceeds a set threshold value or not. The invention effectively solves the problem that the prior art needs to disassemble the wheel speed sensor to detect whether the air gap of the wheel speed sensor exceeds the set threshold value.
furthermore, the method and the system for detecting the air gap of the wheel speed sensor provided by the invention can also make the difference between the medium level and the high level and the low level larger by adjusting the shape of the tooth part. This facilitates distinguishing between differences in high and low levels, and the effect of this approach is more pronounced especially when a medium level is also present.
Further, the method and the system for detecting the air gap of the wheel speed sensor provided by the invention also provide the following specific tooth shapes: the surface shape in the clockwise direction is a concave surface, and the surface shape in the counterclockwise direction is a flat surface, and the like. The tooth shape can better adjust the middle level, so that the signal is more stable.
Furthermore, the invention provides a method and a system for detecting the air gap of the wheel speed sensor, and also provides a specific selection mode of the air gap identification position of the wheel speed sensor: and setting a communication protocol, wherein the level of each level position corresponds to one byte in the communication protocol, determining whether each byte can be used as an air gap identification bit of the wheel speed sensor according to whether each byte is consistent with the rotation direction of the gear ring, and if so, selecting one byte from the bytes as the air gap identification bit of the wheel speed sensor. Therefore, the air gap identification position of the wheel speed sensor can be simply and accurately selected, so that whether the air gap size of the wheel speed sensor exceeds the set threshold value or not can be judged conveniently according to the value of the air gap identification position of the wheel speed sensor.
Drawings
in order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of a wheel speed sensor of the prior art;
FIG. 2 is a square wave plot of the output of an active wheel speed sensor of the prior art;
FIG. 3 is a first flowchart of a method for detecting an air gap of a wheel speed sensor according to an embodiment of the present invention;
FIG. 4 is a square wave plot of Hall sensor output provided in accordance with an embodiment of the present invention;
FIG. 5 is a second flowchart of a method for detecting an air gap of a wheel speed sensor according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for determining an air gap identification of a wheel speed sensor according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a system for detecting an air gap of a wheel speed sensor according to an embodiment of the present invention.
reference numerals:
in fig. 1-7:
1 gear ring 6 regulating resistor
2 Hall sensor
3-capacitor 1' gear ring
4-resistor 2' Hall sensor
5 electronic control unit
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 or similar reference numerals refer to the same or similar parameters or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
the wheel speed sensor shown in fig. 1 generates two levels by hall potential difference generated by the hall effect: high and low. This allows the wheel speed to be calculated based on the number of times the high or low level is sent per unit time. The principle is that the gear ring 1 'continuously rotates, when a tooth part of the gear ring 1' is close to the Hall sensor 2 ', the Hall sensor 2' outputs a high level, and when a tooth groove is close to the Hall sensor 2 ', the Hall sensor 2' generates a low level. As shown in fig. 2, it is a square wave diagram of the output of the active wheel speed sensor in the prior art, in which the circuit outputs two levels: the waveform diagrams are a square waveform diagram, I1 high and I2 low. The capacitor has the function of filtering, namely only outputting a high level I1 when the level is within a certain range above and below the value I1, and only outputting a low level I2 when the level is within a certain range above and below the value I2. For example, if the high level is 2.2mA and the low level is I2 is 1.1mA, the low level of 1.1mA is output when the level is less than or equal to 1.6mA, and the high level of 2.2mA is output when the level is more than 1.6 mA.
According to the invention, the size of the resistor is adjusted, so that the Hall sensor outputs square wave signals with high level, medium level and low level when the gear ring rotates, and part of the medium level can be used for representing the size of the air gap of the wheel speed sensor. The invention effectively solves the problem that the vehicle in the prior art can not quickly and automatically detect whether the air gap between the Hall sensor and the gear ring in the wheel speed sensor exceeds the set threshold value.
In order to better understand the technical scheme and technical effect of the present invention, the following detailed description will be made on specific embodiments with reference to a flow diagram. As shown in fig. 3, a first flowchart of a method for detecting an air gap of a wheel speed sensor according to an embodiment of the present invention is provided, and the method may include the following steps:
The method comprises the following steps of carrying out calibration on an air gap identification position of a wheel speed sensor in advance, wherein the calibration process comprises the following steps:
And step S01, providing a gear ring and a Hall sensor, wherein the gear ring comprises a ring body and teeth uniformly distributed on the ring body.
in this embodiment, the ring gear includes a ring body and teeth uniformly distributed on the ring body, and when the ring gear is continuously rotated, if the teeth of the ring gear are close to the hall sensor, the hall sensor outputs a high level, and if the tooth grooves are close to the wheel speed sensor, the hall sensor outputs a low level.
And step S02, after the Hall sensor is electrified, adjusting the distance between the gear ring and the Hall sensor, so that the Hall sensor outputs square wave signals with high level and low level when the gear ring rotates.
In the present embodiment, by adjusting the distance between the ring gear and the hall sensor, the hall sensor outputs a square wave signal having a high level and a low level when the ring gear rotates. The scheme of the step can be the same as the debugging method of the wheel speed sensor in the prior art, and the details are not described.
step S03, increasing the resistance value between the output end of the hall sensor and the ground so that the difference between the high level and the low level becomes large, and the hall sensor outputting a square wave signal having a high level, a middle level and a low level when the ring gear rotates, wherein a plurality of middle levels exist between two adjacent high levels.
in this embodiment, when the resistance value is larger, the range of the output level of the hall sensor is larger, which may facilitate obtaining an intermediate level besides the high and low levels, for example, by increasing the resistance value and matching with the filtering technique, the hall sensor outputs a low level of 1.2mA, a high level of 4.8mA, and a medium level of 2.4 mA. The resistance value after the resistance is increased may be 80 Ω, 100 Ω, 120 Ω, 150 Ω, and the like. Fig. 4 is a square wave diagram of the output of the hall sensor provided by the embodiment of the invention. Among them, there are 8 mid-levels between the high levels: b1, b2, b3, b4, b5, b6, b7 and b 8. There is a portion of the mid-level that is consistent with whether the wheel speed sensor air gap size exceeds a set threshold.
In step S04, a middle level position consistent with the air gap size of the wheel speed sensor is selected from the plurality of middle level positions as the air gap identification position of the wheel speed sensor.
In the present embodiment, since the air gap size of the wheel speed sensor and some of the intermediate levels are correlated, it is possible to detect whether the air gap size of the wheel speed sensor exceeds the set threshold value based on the intermediate level having the consistency. The set threshold may be determined according to actual use requirements, for example: 0.3mm, 0.4mm, 0.5mm, 0.7mm, 1.0mm and the like, and the air gaps of different wheel speed sensors are different and are determined according to actual requirements.
it should be noted that, after the calibration is performed once in steps S01 to S03, the calibration may be used according to the result of the calibration in the subsequent use, and the calibration does not need to be performed again each time the calibration is used.
in the process of detecting the air gap of the wheel speed sensor:
Step S05, during the operation of the wheel speed sensor, detecting whether the air gap size of the wheel speed sensor exceeds a set threshold according to the level of the air gap flag of the wheel speed sensor.
In this embodiment, since the level of the air gap flag of the wheel speed sensor is consistent with the traveling direction of the vehicle, whether the air gap size of the wheel speed sensor exceeds the set threshold value can be detected according to the level of the air gap flag of the wheel speed sensor. For example, when the level of the air gap flag of the wheel speed sensor is low, it may be determined that the air gap of the wheel speed sensor is greater than the set threshold, and when the level of the air gap flag of the wheel speed sensor is high, it may be determined that the air gap of the wheel speed sensor is less than the set threshold. Of course, the wheel speed sensors of different types have differences, for example, the hall sensors have differences in sensitivity, and it is necessary to adjust and set threshold values, resistance values, and the like according to actual use effects.
The invention judges whether the air gap is in a normal state or not through the gear ring and the Hall sensor, and can realize the rotating speed information acquisition in the prior art. According to the invention, the resistance value of the resistor is adjusted, so that the Hall sensor outputs square wave signals with high level, medium level and low level when the gear ring rotates, and the medium level can represent air gap information of the wheel speed sensor. The invention effectively solves the problem that whether the air gap is normal can be detected only after the wheel speed sensor is disassembled in the prior art.
fig. 5 is a second flowchart of a method for detecting an air gap of a wheel speed sensor according to an embodiment of the present invention. The method further comprises the following steps: in step S56, after the middle level is adjusted, the tooth shape is adjusted so that the difference between the middle level and the high and low levels becomes large.
In the present embodiment, the shape of the teeth may be adjusted to be stepped, asymmetrical on both sides, and other conceivable shapes as long as the shape of the teeth is such that the difference between the middle level and the high level and the low level becomes large, and the middle level is correlated with the turning of the ring gear.
in one embodiment, the shape of the teeth is: the clockwise surface shape and the counterclockwise surface shape are different. Therefore, when the gear ring rotates towards different directions, the Hall sensor outputs different square waves, and the rotating direction of the gear ring can be determined according to the square waves.
Further, the shape of the tooth is: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane; or the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a convex surface; or the surface shape in the clockwise direction is a plane, and the surface shape in the anticlockwise direction is a convex surface; or the surface shape in the clockwise direction is an S-shaped cambered surface, and the surface shape in the anticlockwise direction is a plane. Therefore, three levels of a high level, a medium level and a low level can be formed, the medium level can be used for representing the information of the air gap size of the wheel speed sensor, the high level can be used for representing the rotating speed of the gear ring, and the sensor can simultaneously realize the acquisition of the rotating speed and the information of the air gap size of the sensor.
Fig. 6 is a flowchart illustrating a method for determining an air gap identification of a wheel speed sensor according to an embodiment of the present invention.
in the present embodiment, the shape of the tooth is: the clockwise surface shape is a concave surface, and the counterclockwise surface shape is a flat surface. The step of selecting a middle level position with consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as the air gap identification position of the wheel speed sensor comprises the following steps:
In step S61, the number of middle levels between two adjacent high levels is determined.
in step S62, communication protocols are set, each level of the level position corresponds to a byte in the communication protocol, and each byte represents the level of the level position, wherein the level of the level position corresponds to 1, and the level of the level position corresponds to 0.
and step S63, rotating the gear ring, and comparing whether the size of each byte in the signal output by the sensor and the air gap of the wheel speed sensor exceeds a set threshold value.
In step S64, if a byte corresponding to a middle level position is 0 when the air gap size of the wheel speed sensor exceeds the set threshold and is 1 when the air gap size of the wheel speed sensor does not exceed the set threshold, the byte can be used as the air gap identification bit of the wheel speed sensor.
In step S65, one of the bytes that can be used as the air gap flag of the wheel speed sensor is selected as the air gap flag of the wheel speed sensor.
in one embodiment, I0 is a middle level, each middle level corresponds to a Bit (byte) in the communication protocol, and each Bit can be determined to be used for characterizing the air gap size of the wheel speed sensor according to the consistency between the level of some middle level positions and the air gap size of the wheel speed sensor by using a binary code whose level is 0 or 1. For example, Bit b4 No. 4 in FIG. 4 is used to indicate the driving direction of the whole vehicle, the code b4 sends out code 0 when the air gap size of the wheel speed sensor exceeds a set threshold, and the code 1 when the air gap size of the wheel speed sensor does not exceed the set threshold. That is, the b3 level is I0 when the air gap size of the wheel speed sensor exceeds a set threshold, and the b3 level is I2 when the air gap size of the wheel speed sensor does not exceed the set threshold.
accordingly, the present invention further provides a system for detecting an air gap of a wheel speed sensor corresponding to the method described above, as shown in fig. 7, which is a schematic structural diagram of a system for detecting an air gap of a wheel speed sensor provided according to an embodiment of the present invention, including:
the circuit comprises a gear ring 1, a Hall sensor 2, a capacitor 3, a resistor 4, an electronic control unit 5 and an adjusting resistor 6, wherein a radial extension line of a probe of the Hall sensor 2 passes through the circle center of the gear ring 1 and is positioned on the same plane with the gear ring 1, the capacitor 3 is connected in parallel between a power supply end and an output end of the Hall sensor 2, the output end of the Hall sensor 2 is also respectively grounded and connected with the electronic control unit 5, and the resistor 4 is connected in series between the output end of the Hall sensor 2 and the ground;
The adjusting resistor 6 is connected between the output end of the Hall sensor 2 and the ground in series and used for increasing the resistance value between the output end of the Hall sensor 2 and the ground, so that the difference value between a high level and a low level is increased, the Hall sensor 2 outputs square wave signals with the high level, a medium level and the low level when the gear ring 1 rotates, and the capacitor 3 plays a filtering role, wherein a plurality of medium levels exist between two adjacent high levels;
The electronic control unit 5 selects a position of the middle level having consistency with the air gap size of the wheel speed sensor from the positions corresponding to the plurality of middle levels of the received square wave signal as an air gap identification position of the wheel speed sensor, and then detects whether the air gap size of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification position of the wheel speed sensor.
Further, in order to make the difference between the high level, the middle level, and the low level more apparent, the ring gear 1 includes: comprises a ring body and teeth uniformly distributed on the ring body. The tooth portion is shaped so that the difference between the middle level and the high and low levels becomes large.
Wherein the shape of the tooth part is: the clockwise surface shape and the counterclockwise surface shape are different.
preferably, the shape of the teeth is: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane; or the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a convex surface; or the surface shape in the clockwise direction is a plane, and the surface shape in the anticlockwise direction is a convex surface; or the surface shape in the clockwise direction is an S-shaped cambered surface, and the surface shape in the anticlockwise direction is a plane. It should be noted that the above examples are only illustrative examples, and should not be construed as limiting the present invention.
in another embodiment, the electronic control unit 5 is specifically configured to:
in the setting process of the communication protocol: determining the number of the middle levels between two adjacent high levels; setting a byte for each middle level position, wherein each byte represents the level of the level position, the middle level corresponds to 1, and the low level corresponds to 0; when the gear ring 1 rotates, comparing whether the size of each byte in the signal output by the Hall sensor 2 and the size of the air gap of the wheel speed sensor exceed the consistency of a set threshold value, and determining the air gap identification position of the wheel speed sensor; wherein, the wheel speed sensor air gap identification position at least satisfies the following conditions: byte is 0 when the wheel speed sensor air gap size exceeds a set threshold and is 1 when the wheel speed sensor air gap size does not exceed the set threshold.
in the process of detecting the air gap of the wheel speed sensor: the electronic control unit 5 detects whether the air gap size of the wheel speed sensor exceeds a set threshold value according to the value of the air gap identification position of the wheel speed sensor, wherein when the air gap identification position of the wheel speed sensor is 0, the air gap size of the wheel speed sensor is abnormal; when the air gap identification position of the wheel speed sensor is 1, the air gap of the wheel speed sensor is normal.
according to the system for detecting the air gap of the wheel speed sensor, whether the size of the air gap of the wheel speed sensor exceeds the set threshold value is judged through the gear ring 1 and the Hall sensor 2. According to the invention, the difference between the medium level output by the Hall sensor 2 when the gear ring 1 rotates and the high level and the low level is more obvious by adjusting the size of the resistor, and the medium level can represent the size of the air gap of the wheel speed sensor. The invention effectively solves the problems that the prior art needs to disassemble the wheel speed sensor for air gap testing, wastes time and labor and is difficult to restore.
The embodiments in this specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other. In particular, for system embodiments, since they are substantially similar to method embodiments, they are described in a relatively simple manner, and reference may be made to some descriptions of method embodiments for relevant points. The above-described system embodiments are merely illustrative, in that the elements described as separate components may or may not be physically separate. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
the above embodiments of the present invention have been described in detail, and the present invention is described herein using specific embodiments, but the above embodiments are only used to help understanding the method and system of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (2)

1. a method of detecting an air gap in a wheel speed sensor, comprising:
The method comprises the following steps of carrying out calibration on an air gap identification position of a wheel speed sensor in advance, wherein the calibration process comprises the following steps:
Providing a gear ring and a Hall sensor, wherein the gear ring comprises a ring body and tooth parts uniformly distributed on the ring body;
after the Hall sensor is electrified, adjusting the distance between the gear ring and the Hall sensor to enable the Hall sensor to output square wave signals with high level and low level when the gear ring rotates;
Increase the resistance value between hall sensor output and the ground connection for the difference between high level and the low level grow, and hall sensor output when the ring gear rotates has the square wave signal of high level, well level and low level, wherein, there is the level in the several between two adjacent high levels, after debugging well level, the shape of adjustment tooth makes the difference grow between well level and high level, the low level, the shape of tooth portion after the adjustment is: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane;
Selecting a middle level position which has consistency with the size of the air gap of the wheel speed sensor from the positions of the middle levels as an air gap identification position of the wheel speed sensor, wherein the air gap of the wheel speed sensor is the air gap between the gear ring and the Hall sensor;
detecting whether the size of the air gap of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification bit of the wheel speed sensor in the working process of the wheel speed sensor;
the step of selecting a middle level position with consistency with the air gap size of the wheel speed sensor from the positions of the middle levels as the air gap identification position of the wheel speed sensor comprises the following steps:
Determining the number of the middle levels between two adjacent high levels;
Setting a communication protocol, wherein the level of each middle level position corresponds to one byte in the communication protocol, and each byte represents the level of the level position, wherein the middle level corresponds to 1, and the low level corresponds to 0;
rotating the gear ring, and comparing whether the size of each byte in a signal output by the sensor and the size of an air gap of the wheel speed sensor exceed a set threshold value or not;
If a byte corresponding to a certain middle level position is 0 when the air gap size of the wheel speed sensor exceeds a set threshold value, and the byte is 1 when the air gap size of the wheel speed sensor does not exceed the set threshold value, the byte can be used as an air gap identification bit of the wheel speed sensor;
And selecting one byte from the bytes which can be used as the air gap identification bit of the wheel speed sensor.
2. A system for detecting an air gap in a wheel speed sensor, comprising:
Ring gear (1), hall sensor (2), electric capacity (3), resistance (4), electronic control unit (5), and adjusting resistor (6), the radial extension line of the probe of hall sensor (2) passes the centre of a circle of ring gear (1), and be located the coplanar with ring gear (1), parallelly connected electric capacity (3) between the power end of hall sensor (2) and the output, the output of hall sensor (2) still ground connection respectively and link to each other with electronic control unit (5), resistance (4) establish ties between the output of hall sensor (2) and ground connection, ring gear (1) includes: the ring comprises a ring body and tooth parts uniformly distributed on the ring body, wherein the tooth parts are in the shapes of: the surface shape in the clockwise direction is a concave surface, and the surface shape in the anticlockwise direction is a plane;
The adjusting resistor (6) is connected between the output end of the Hall sensor (2) and the ground in series and used for increasing the resistance value between the output end of the Hall sensor (2) and the ground, so that the difference value between a high level and a low level is increased, the Hall sensor (2) outputs square wave signals with the high level, a medium level and the low level when the gear ring (1) rotates, and the capacitor (3) plays a filtering role, wherein a plurality of medium levels exist between two adjacent high levels;
The electronic control unit (5) selects a middle level position which is consistent with the air gap size of the wheel speed sensor from positions corresponding to a plurality of middle levels of the received square wave signal as an air gap identification position of the wheel speed sensor, and then detects whether the air gap size of the wheel speed sensor exceeds a set threshold value according to the level of the air gap identification position of the wheel speed sensor, wherein the air gap of the wheel speed sensor is the air gap between the gear ring (1) and the Hall sensor (2);
the electronic control unit (5) is specifically configured to:
in the setting process of the communication protocol: determining the number of the middle levels between two adjacent high levels; setting a byte for each middle level position, wherein each byte represents the level of the level position, the middle level corresponds to 1, and the low level corresponds to 0; when the gear ring (1) rotates, comparing whether the size of each byte in a signal output by the Hall sensor (2) and the size of the air gap of the wheel speed sensor exceed the consistency of a set threshold value, and determining the air gap identification position of the wheel speed sensor; wherein, the wheel speed sensor air gap identification position at least satisfies the following conditions: byte is 0 when the air gap size of the wheel speed sensor exceeds a set threshold, and is 1 when the air gap size of the wheel speed sensor does not exceed the set threshold;
in the process of detecting the air gap of the wheel speed sensor: the electronic control unit (5) detects the air gap of the wheel speed sensor according to the value of the air gap identification position of the wheel speed sensor, wherein when the air gap identification position of the wheel speed sensor is 0, the size of the air gap of the wheel speed sensor is abnormal; when the air gap identification position of the wheel speed sensor is 1, the air gap of the wheel speed sensor is normal.
CN201611177063.XA 2016-12-19 2016-12-19 method and system for detecting air gap of wheel speed sensor Expired - Fee Related CN106595465B (en)

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JPH1183890A (en) * 1997-09-09 1999-03-26 Denso Corp Rotating direction detecting device
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KR100666145B1 (en) * 2001-12-08 2007-01-10 주식회사 만도 Method for sensing air-gap error in a wheel speed sensor
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DE102005022596A1 (en) * 2005-05-17 2006-11-23 Continental Teves Ag & Co. Ohg Arrangement for intrinsically safe wheel speed detection
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