CN110618294A - Pulse type vehicle speed sensor signal diagnosis method - Google Patents
Pulse type vehicle speed sensor signal diagnosis method Download PDFInfo
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- CN110618294A CN110618294A CN201910852652.0A CN201910852652A CN110618294A CN 110618294 A CN110618294 A CN 110618294A CN 201910852652 A CN201910852652 A CN 201910852652A CN 110618294 A CN110618294 A CN 110618294A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000005070 sampling Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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- General Physics & Mathematics (AREA)
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Abstract
The invention provides a pulse type vehicle speed sensor signal diagnosis method, which comprises the following steps: whether the vehicle speed sensor reports an electrical fault is judged according to the voltage acquisition condition of the detection circuit; if yes, displaying the faults and fault types of the vehicle speed sensor; if not, continuing to diagnose; checking whether an ABS wheel speed signal is received or not, and if not, displaying that the ABS signal is lost and has a fault; if yes, executing the next judgment; judging whether the ABS wheel speed signal data is valid or not, if so, displaying an invalid fault of the ABS signal, and if so, executing the next operation; judging whether the vehicle speed signal is effective or not, and if the vehicle speed signal is effective, not judging; if the parking signal does not exist and the vehicle is started, judging the validity of the vehicle speed signal, and judging whether the vehicle speed signal is valid or not by comparing the error between the vehicle speed and the wheel speed; the invention realizes the diagnosis of the electrical fault of the sensor.
Description
Technical Field
The invention relates to the technical field of vehicle speed detection, in particular to a pulse type vehicle speed sensor signal diagnosis method.
Background
In the prior art, when an electric fault exists in a vehicle speed sensor, an electric fault diagnosis method is adopted for fault diagnosis; for other faults except electrical faults, wheel speed sensed by a wheel speed sensor for driving wheels is mainly used as a basis for diagnosing a vehicle speed sensor, and the risk of vehicle speed misdiagnosis is reduced by judging the validity of the wheel speed and checking whether the average wheel speed is greater than the rotating speed of the vehicle speed sensor in a low-precision area to respectively shield the invalid wheel speed and the low-precision area of the vehicle speed sensor; the accuracy of the average wheel speed signal of the driving wheel is verified in an off-line mode, and the fault judgment threshold value is reasonably matched, so that the false alarm probability of the faults of the vehicle speed sensor is reduced, and the reasonable final vehicle speed is obtained. The defects of the prior art are that the diagnosis of the electrical faults of the vehicle speed sensor is incomplete; the signal considerations that affect the validity of the sensor signal are incomplete.
Disclosure of Invention
The invention aims to provide a pulse type vehicle speed sensor signal diagnosis method aiming at the defects of the prior art, and the diagnosis of the electrical fault of a sensor is realized.
The technical scheme adopted by the invention is as follows: a pulse type vehicle speed sensor signal diagnosis method is characterized by comprising the following steps:
whether the vehicle speed sensor reports an electrical fault is judged according to the voltage acquisition condition of the detection circuit; if yes, displaying the faults and fault types of the vehicle speed sensor; if not, continuing to diagnose;
checking whether an ABS wheel speed signal is received or not, and if not, displaying that the ABS signal is lost and has a fault; if yes, executing the next judgment;
judging whether the ABS wheel speed signal data is valid or not, if so, displaying an invalid fault of the ABS signal, and if so, executing the next operation;
judging whether the vehicle speed signal is effective or not, and if the vehicle speed signal is effective, not judging; if the parking signal does not exist and the vehicle is started, judging the validity of the vehicle speed signal, and judging whether the vehicle speed signal is valid or not by comparing the error between the vehicle speed and the wheel speed;
if the error is within the threshold range, judging that the vehicle speed signal is effective; if the error exceeds the threshold range, starting a timing device, and judging that the vehicle speed signal is invalid after timing reaches a certain time requirement; and if a brake signal exists in the timing process, resetting the timing and timing again.
In the technical scheme, after the vehicle is started, when the wheel speed is more than 20km/h and less than 80km/h, the upper limit of the error between the vehicle speed and the wheel speed is 10 percent; if the error is larger than 10%, judging that the vehicle speed signal is not credible; if the error is less than 0%, judging that the vehicle speed signal is credible;
when the wheel speed is greater than 80km/h, the upper limit of the error between the vehicle speed and the wheel speed is 20%; if the error is more than 20%, judging that the vehicle speed signal is not credible; if the error is less than 10%, the vehicle speed signal is credible.
In the technical scheme, when the wheel speed is more than 20km/h and less than 80km/h and the error between the vehicle speed and the wheel speed is more than 10%, when the wheel speed is more than 80km/h and the error between the vehicle speed and the wheel speed is more than 20%, if the error is maintained to be more than 5s of standard duration, the vehicle speed signal is judged to be invalid; and if the brake signal appears within the 5s timing range, restarting timing.
The determination values of the timing time, the wheel speed and the error in the technical scheme can be adjusted according to the specific vehicle body condition.
In the above technical solution, the detection circuit includes a hall collector, a transistor T1, a resistor R1, and a resistor R2; the Hall collector is used for collecting a vehicle speed signal; the output end of the Hall collector is electrically connected with the base electrode of the triode, and the emitting electrode of the triode is grounded; the power supply of the Hall collector is electrically connected with the collector electrode of the triode through a resistor R1; the output end of the detection circuit is electrically connected with the collector electrode of the triode through a resistor R2; the output end of the detection circuit is electrically connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is electrically connected with a controller for judging whether the vehicle speed signal is in fault.
In the above technical solution, the AD sampling circuit includes a resistor R391, a resistor R392, and a capacitor C223; resistor R392 is connected in parallel with resistor C223; the output end of the detection circuit is grounded through a resistor R391 and a resistor R392; the output terminal of the AD sampling circuit is connected between the resistor R391 and the resistor R392.
In the technical scheme, the low level or the high level of the Hall collector during normal work output is raised by the detection circuit; the output level of the Hall collector is kept unchanged through the detection circuit when the signal is short-circuited to the ground or the power supply.
In the above technical solution, the AD adopts a circuit to convert the output electrical frequency signal of the detection circuit into different voltage signals.
The invention provides a method for diagnosing the electric fault of a vehicle speed sensor, which is characterized in that a detection circuit is additionally arranged on the basis of the existing hardware circuit by changing the hardware circuit of an instrument and the vehicle speed sensor, the low level voltage of a vehicle speed signal output by the sensor is raised, and the voltage in an open circuit state is separated from the normal high/low level, so that the diagnosis of the electric fault of the sensor is realized, and the controller can judge the type of the electric fault of the vehicle speed sensor directly through the output voltage of the detection circuit. Under the condition that the vehicle speed sensor has no fault, the complete diagnosis of the validity of the vehicle speed signal is realized through the logical judgment of a diagnosis signal of a software layer, an ABS wheel speed signal, a parking signal, a brake signal and the like; the complete diagnosis of the electrical fault of the vehicle speed sensor is ensured; the signals that affect the validity of the sensor signal are considered discreet.
Drawings
FIG. 1 is a logic diagram of the present invention;
FIG. 2 is a schematic diagram of the detection circuit of the present invention;
FIG. 3 is a schematic diagram of an AD sampling circuit of the present invention;
FIG. 4 is a schematic diagram of the detection circuit output;
fig. 5 is a circuit schematic of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in FIG. 1, the present invention provides a pulse type vehicle speed sensor signal diagnosis method, which jointly diagnoses whether a vehicle speed signal is valid or not according to a vehicle speed sensor diagnosis signal, an ABS wheel speed signal, a parking signal and a brake signal in application layer software. And comparing the output signal of the vehicle speed sensor with the ABS wheel speed signal under the condition that the electrical circuit fault does not exist in the vehicle speed sensor and the ABS wheel speed signal is normal, if the error between the output signal of the vehicle speed sensor and the ABS wheel speed signal is within a specified range, the signal of the vehicle speed sensor is valid, and if the error between the output signal of the vehicle speed sensor and the ABS wheel speed signal exceeds the specified range, the signal of the vehicle speed sensor is. The method specifically comprises the following steps:
(1) after power-on initialization, a detection circuit diagnoses whether the vehicle speed sensor has an electrical fault according to a sensor fault diagnosis strategy, if so, a fault name is displayed, and if not, the next step of judgment is executed;
(2) the judgment reference for judging whether the vehicle speed signal is valid is an ABS wheel speed signal, so that whether the ABS wheel speed signal is received or not needs to be judged under the condition that the vehicle speed sensor is confirmed to have no electrical fault, if the ABS wheel speed signal is not received, the ABS signal loss fault is displayed, and if the ABS wheel speed signal is received, the next judgment is executed;
(3) under the condition of receiving an ABS wheel speed signal, judging whether signal data are valid or not, if the signal data are invalid, displaying invalid faults of the ABS signal, and if the signal data are valid, executing the next operation;
(4) and judging whether the vehicle speed signal is valid or not under the condition that the first three conditions are met, at the moment, if a parking signal exists, judging not, and if the parking signal does not exist and the vehicle is started (> 20km/h), judging the validity of the vehicle speed signal. And judging whether the vehicle speed signal is effective or not by comparing the error between the vehicle speed and the wheel speed. Because the errors of different wheel speed ranges are inconsistent, segmented comparison is carried out:
a) when the wheel speed is less than 80km/h, the upper limit of the error between the vehicle speed and the wheel speed is 10%, and if the error is more than 10%, the vehicle speed signal is not credible; if the error is less than 10%, the vehicle speed signal is credible;
b) when the wheel speed is more than 80km/h, the upper limit of the error between the vehicle speed and the wheel speed is 20%, and if the error is more than 20%, the vehicle speed signal is not credible; if the error is less than 20%, the vehicle speed signal is credible.
Wherein:
1) the vehicle speed diagnosis is only needed to achieve the diagnosis purpose, high real-time performance is not required, and the vehicle speed for starting the vehicle is specified to be 20km/h to avoid false alarm caused by the change of wheel speed signals due to starting, turning, braking, uneven road surfaces and the like.
2) According to the road test condition, the judgment range of the wheel speed error is very loose (20%), the error is small at low speed and large at high speed, and the error range is 10% when the error range is less than 80 km/h; error range is enlarged to 20% by 80 km/h.
3) And when the wheel speed and the vehicle speed signal are not matched, starting timing (5s), and if the fault lasts for more than 5s, judging that the vehicle speed signal is invalid. And if the brake signal appears within the 5s timing range, restarting timing. The brake can lead to the mismatching of the vehicle speed and the wheel speed signals. Meanwhile, if the K value is wrong or the vehicle speed sensor is broken, the fault is always present, and the real-time diagnosis is not necessary.
As shown in fig. 2 and 5, the detection circuit includes a hall collector, a transistor T1, a resistor R1, and a resistor R2; the Hall collector is used for collecting a vehicle speed signal; the output end of the Hall collector is electrically connected with the base electrode of the triode, and the emitting electrode of the triode is grounded; the power supply of the Hall collector is electrically connected with the collector electrode of the triode through a resistor R1; the output end of the detection circuit is electrically connected with the collector electrode of the triode through a resistor R2; the output end of the detection circuit is electrically connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is electrically connected with a controller for judging whether the vehicle speed signal is in fault. The detection circuit adds a pull-up resistor R1 for voltage division. When the resistor R1 is not provided, the output voltage values of the vehicle speed sensors are close to each other and cannot be distinguished due to the same effect that the vehicle speed sensors are short-circuited to the ground when the vehicle speed sensors are at a normal low level. When the resistor R1 exists, the output voltage is raised (about 1.8V) due to the low level of the normal working output of the sensor under the action of resistor voltage division, and the output voltage value of the signal short circuit to the ground is less than 0.3, so that the fault identification is realized. Similarly, the voltage in the open circuit state is located in the middle area of the voltage sampling value of the normal high/low level signal, and the output value of the normal high level is increased, so that the open circuit and the normal high/low level signal are distinguished, as shown in fig. 3.
The controller obtains the diagnostic signal value of the sensor state through the received output value of the detection circuit, the bottom layer data detection and the parameter configuration result as shown in the following table.
| Detecting voltage value (V) | The judgment result | Diagnostic signal |
| <0.3 | Short-circuited to ground | 0x0080 |
| 1.8～2.1 | Normal low level | 0x0000 |
| 4.2～4.6 | Open circuit | 0x0200 |
| 8.1～10 | Normal high level | 0x0000 |
| >13 | Short-circuited to a power supply | 0x0100 |
And the controller transmits the judgment result and the diagnosis signal to the display equipment and displays the corresponding fault content.
The AD sampling circuit comprises a resistor R391, a resistor R392 and a capacitor C223; resistor R392 is connected in parallel with resistor C223; the output end of the detection circuit is grounded through a resistor R391 and a resistor R392; the output terminal of the AD sampling circuit is connected between the resistor R391 and the resistor R392. As shown in fig. 4, the AD sampling circuit is used to convert the output electrical frequency signal of the sensor into a different voltage signal.
According to the invention, another detection circuit is added beside the vehicle speed signal input circuit, and simultaneously, the instrument and the vehicle speed sensor circuit are changed, so that the low level voltage of the vehicle speed signal output by the sensor is raised, and the voltage in an open circuit state is separated from the normal high/low level, thereby realizing the diagnosis of the electrical fault of the sensor; the complete diagnosis of the vehicle speed signal effectiveness is realized through the diagnosis signal of a software layer and the logic judgment of an ABS wheel speed signal, a parking signal, a brake signal and the like. The error range value of the comparison between the vehicle speed signal and the wheel speed signal is an empirical value obtained through real vehicle verification. The selection of the parameter value has certain practical value.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (7)
1. A pulse type vehicle speed sensor signal diagnosis method is characterized by comprising the following steps:
whether the vehicle speed sensor reports an electrical fault is judged according to the voltage acquisition condition of the detection circuit; if yes, displaying the faults and fault types of the vehicle speed sensor; if not, continuing to diagnose;
checking whether an ABS wheel speed signal is received or not, and if not, displaying that the ABS signal is lost and has a fault; if yes, executing the next judgment;
judging whether the ABS wheel speed signal data is valid or not, if so, displaying an invalid fault of the ABS signal, and if so, executing the next operation;
judging whether the vehicle speed signal is effective or not, and if the vehicle speed signal is effective, not judging; if the parking signal does not exist and the vehicle is started, judging the validity of the vehicle speed signal, and judging whether the vehicle speed signal is valid or not by comparing the error between the vehicle speed and the wheel speed;
if the error is within the threshold range, judging that the vehicle speed signal is effective; if the error exceeds the threshold range, starting a timing device, and judging that the vehicle speed signal is invalid after timing reaches a certain time requirement; and if a brake signal exists in the timing process, resetting the timing and timing again.
2. The pulse type vehicle speed sensor signal diagnosis method according to claim 1, wherein an upper limit of an error between the vehicle speed and the wheel speed is 10% when the wheel speed is more than 20km/h and less than 80km/h after the vehicle is started; if the error is larger than 10%, judging that the vehicle speed signal is not credible; if the error is less than 10%, judging that the vehicle speed signal is credible;
when the wheel speed is greater than 80km/h, the upper limit of the error between the vehicle speed and the wheel speed is 20%; if the error is more than 20%, judging that the vehicle speed signal is not credible; and if the error is less than 0%, the vehicle speed signal is credible.
3. The pulse type vehicle speed sensor signal diagnosis method according to claim 2, wherein when the wheel speed is more than 20km/h and less than 80km/h and the error between the vehicle speed and the wheel speed is more than 10%, when the wheel speed is more than 80km/h and the error between the vehicle speed and the wheel speed is more than 20%, if the error is maintained to last for more than 5s as a criterion, the vehicle speed signal is judged to be invalid; and if the brake signal appears within the 5s timing range, restarting timing.
4. The pulse type vehicle speed sensor signal diagnosis method according to claim 3, characterized in that the detection circuit comprises a Hall collector, a transistor T1, a resistor R1 and a resistor R2; the Hall collector is used for collecting a vehicle speed signal; the output end of the Hall collector is electrically connected with the base electrode of the triode, and the emitting electrode of the triode is grounded; the power supply of the Hall collector is electrically connected with the collector electrode of the triode through a resistor R1; the output end of the detection circuit is electrically connected with the collector electrode of the triode through a resistor R2; the output end of the collector of the detection circuit is electrically connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is electrically connected with a controller for judging whether the vehicle speed signal is in fault.
5. The pulse type vehicle speed sensor signal diagnosis method according to claim 4, characterized in that the AD sampling circuit includes a resistor R391, a resistor R392 and a capacitor C223; resistor R392 is connected in parallel with resistor C223; the output end of the detection circuit is grounded through a resistor R391 and a resistor R392; the output terminal of the AD sampling circuit is connected between the resistor R391 and the resistor R392.
6. The pulse type vehicle speed sensor signal diagnosis method according to claim 5, characterized in that the low level or the high level of the Hall collector is raised by the detection circuit when the Hall collector outputs in normal operation; the output level of the Hall collector is kept unchanged through the detection circuit when the signal is short-circuited to the ground or the power supply.
7. The pulse type vehicle speed sensor signal diagnosis method according to claim 6, wherein the AD employs a circuit to convert the output electrical frequency signal of the detection circuit into a different voltage signal.
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| CN201910852652.0A CN110618294A (en) | 2019-09-10 | 2019-09-10 | Pulse type vehicle speed sensor signal diagnosis method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111665781A (en) * | 2020-06-23 | 2020-09-15 | 成都工具研究所有限公司 | Self-checking type motion detection control device and method |
| CN113219210A (en) * | 2021-05-31 | 2021-08-06 | 东风商用车有限公司 | Vehicle speed sensor signal rationality diagnosis method and system |
| CN113419082A (en) * | 2021-06-21 | 2021-09-21 | 湖南行必达网联科技有限公司 | Input signal processing circuit with detection and diagnosis functions |
| CN113734186A (en) * | 2021-08-27 | 2021-12-03 | 东风商用车有限公司 | Method, device and equipment for judging vehicle speed fault and readable storage medium |
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| CN111665781A (en) * | 2020-06-23 | 2020-09-15 | 成都工具研究所有限公司 | Self-checking type motion detection control device and method |
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