CN114323102B - SENT interface sensor fault diagnosis method, device and system - Google Patents
SENT interface sensor fault diagnosis method, device and system Download PDFInfo
- Publication number
- CN114323102B CN114323102B CN202111551963.7A CN202111551963A CN114323102B CN 114323102 B CN114323102 B CN 114323102B CN 202111551963 A CN202111551963 A CN 202111551963A CN 114323102 B CN114323102 B CN 114323102B
- Authority
- CN
- China
- Prior art keywords
- sent
- data
- fault
- interface sensor
- type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003745 diagnosis Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004891 communication Methods 0.000 claims abstract description 122
- 230000001360 synchronised effect Effects 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 12
- 241000238876 Acari Species 0.000 claims description 9
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Abstract
The invention provides a SENT interface sensor fault diagnosis method, which comprises the following steps: acquiring the state communication section data, the acquisition parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performing fault diagnosis when the preset fault diagnosis enabling conditions are met; preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor; preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data; if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, the corresponding first type fault or the second type fault is confirmed.
Description
Technical Field
The invention relates to the field of automobile SENT interface sensors, in particular to a fault diagnosis method, device and system for a SENT interface sensor.
Background
With the development of automobile electronic control technology, the number of sensors used in an automobile inevitably increases gradually, and the increase of the sensors brings challenges such as the increase of system cost, sensor wiring and complexity of an electronic control unit. To meet the needs of low cost advanced sensors, the industry has formulated the send (Single Edge Nibble Transmission, single side nibble transport) protocol using a digital interface. The SENT protocol is a new standard SAE J2716 for communication between an automobile sensor and an ECU, which is introduced by SAE of automotive engineers in the United states, has better EMC characteristics than AD and PWM outputs, saves wiring harnesses and pin joints, can transmit fault codes so that the sensor system has strong fault diagnosis capability, and is used for transmitting high-precision sensor data between the sensor and an electronic control unit in an automobile.
At present, the fault diagnosis of the automobile SENT interface sensor generally judges whether the automobile SENT interface sensor has faults or not by receiving the data of the automobile SENT interface sensor or carrying out threshold judgment on the received acquisition parameter data, but the fault types of the sensors cannot be distinguished, and corresponding fault diagnosis cannot be carried out according to the actual running condition of an object to be acquired, so that the reliability of the fault diagnosis of the SENT interface sensor is low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention innovatively provides a SENT interface sensor fault diagnosis method, device and system, which effectively solve the problem of low reliability of SENT interface sensor fault diagnosis caused by the prior art, and effectively improve the reliability and accuracy of SENT interface sensor fault diagnosis.
The first aspect of the invention provides a SENT interface sensor fault diagnosis method, which comprises the following steps:
acquiring the state communication section data, the acquisition parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performing fault diagnosis when the preset fault diagnosis enabling conditions are met;
preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
and if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, confirming the corresponding first type fault or second type fault, wherein the first type fault is an electrical fault, and the second type fault is a signal fault.
Optionally, the preset fault diagnosis enabling condition is: the communication state of the SENT interface, the working state of the sensor of the SENT interface and the working state of the object to be acquired are all normal.
Optionally, the primary determination of whether the SENT interface sensor has the first type of fault according to the state communication segment data of the SENT interface sensor is specifically:
establishing a corresponding relation between a first type fault zone bit and a first type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
and preliminarily determining whether the SENT interface sensor has the first type fault or not according to the first type fault zone bit in the acquired state communication section data of the SENT interface sensor.
Further, according to the obtained first type fault zone bit in the state communication section data of the SENT interface sensor, whether the SENT interface sensor has the first type fault is determined preliminarily, specifically:
if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, preliminarily determining that the SENT interface sensor has the first type fault;
and preliminarily determining the fault reason causing the first type fault according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the first type fault in the state communication section data of the SENT interface sensor.
Optionally, determining whether the second type of fault exists in the send interface sensor according to the operation data of the object to be acquired and the acquisition parameter data is specifically:
establishing a corresponding relation between a second type fault zone bit and a second type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
and preliminarily determining whether the SENT interface sensor has a second type fault or not according to the second type fault zone bit in the acquired state communication section data of the SENT interface sensor.
Further, according to the acquired second type fault zone bit in the state communication section data of the SENT interface sensor, whether the SENT interface sensor has the second type fault is determined preliminarily, specifically:
if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, judging whether the acquired parameter data of the SENT interface sensor all accord with a preset acquisition range under the condition that an object to be acquired meets a first preset operation condition, and if the acquired parameter data of the SENT interface sensor all accord with the preset acquisition range, primarily determining that the SENT interface sensor has the second type fault;
And primarily determining the fault reason causing the second type fault according to the position of the zone bit corresponding to the second type fault in the acquired zone bit of the second type fault in the state communication section data of the SENT interface sensor.
The second aspect of the present invention provides a SENT interface sensor fault diagnosis apparatus, including:
the acquisition unit acquires the state communication section data, the acquisition parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performs fault diagnosis when the preset fault diagnosis enabling condition is met;
the first determining unit is used for preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
the second determining unit is used for preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
and a third determining unit for confirming the corresponding first type fault or second type fault if the duration time of the first type fault or the second type fault is greater than the threshold value corresponding to the preset time period, wherein the first type fault is an electrical fault and the second type fault is a signal fault.
A third aspect of the present invention provides a send interface sensor fault diagnosis system, comprising: the fault diagnosis device comprises a fault diagnosis module, a SENT interface sensor, a SENT signal acquisition module, a communication module and an upper computer, wherein the input end of the SENT signal acquisition module is connected with the output end of the SENT interface sensor, the output end of the SENT signal acquisition module is connected with the input end of the fault diagnosis module, the fault diagnosis module is in communication connection with the upper computer through the communication module to obtain operation data of an object to be acquired, and the fault diagnosis module is used for carrying out fault diagnosis on the SENT interface sensor according to the data SENT by the SENT interface sensor and the operation data of the object to be acquired.
Optionally, the system further comprises a power module, wherein the power module supplies power for the fault diagnosis module, the SENT interface sensor, the SENT signal acquisition module and the communication module.
Optionally, the system further comprises a signal processing module, wherein the input end of the signal processing module is connected with the output end of the SENT signal acquisition module, and the output end of the signal processing module is connected with the input end of the fault chopping module.
The technical scheme adopted by the invention comprises the following technical effects:
1. in the technical scheme of the invention, whether the SENT interface sensor has a first type of fault is preliminarily determined according to the state communication segment data of the SENT interface sensor; preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data; if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, the corresponding first type fault or second type fault is confirmed, diagnosis of the first type fault and the second type fault is realized, the problem that the fault diagnosis reliability of the SENT interface sensor is low due to the prior art is effectively solved, and the reliability and the accuracy of the fault diagnosis of the SENT interface sensor are effectively improved.
2. The technical scheme of the invention presets fault diagnosis enabling conditions as follows: the SENT interface communication state, the SENT interface sensor working state and the object working state to be acquired are all normal, and fault diagnosis can be conducted on the SENT interface sensor only when the preset diagnosis enabling conditions are met, so that the problem that diagnosis errors are caused by the fact that the diagnosis enabling conditions are not met and the reliability and the accuracy of fault diagnosis results are affected is avoided.
3. In the technical scheme of the invention, when a first type of faults are diagnosed, a corresponding relation between a first type of fault zone bit and a first type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the first type of faults; if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, the SENT interface sensor is preliminarily determined to have the first type fault, and the reliability of fault diagnosis is improved; and the fault cause of the first type fault can be preliminarily determined according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the state communication section data of the SENT interface sensor, so that the efficiency of fault diagnosis is improved.
4. In the technical scheme of the invention, when the second type of faults are diagnosed, the corresponding relation between the second type of fault zone bit and the second type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the second type of faults; if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, judging whether the acquisition parameter data of the SENT interface sensor all meet a preset acquisition range under the condition that an object to be acquired meets a first preset operation condition, if the acquisition parameter data of the SENT interface sensor all meet the preset acquisition range, primarily determining that the SENT interface sensor has the second type fault, and considering the actual operation condition of the object to be acquired in the primary determination of the second type fault, thereby improving the reliability of fault diagnosis; and the fault cause of the second type fault can be determined at first according to the position of the corresponding second type fault zone bit in the acquired SENT interface sensor state communication section data, so that the fault diagnosis efficiency is improved.
5. The fault diagnosis system in the technical scheme of the invention further comprises a power supply module which can supply power to the fault diagnosis module, the SENT interface sensor, the SENT signal acquisition module and the communication module, so that the smooth implementation of fault diagnosis is ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or of the prior art, and it will be obvious to those skilled in the art that other drawings can be obtained from these without inventive labour.
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a schematic waveform diagram of a synchronization pulse in a method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of waveforms of different data segments in the same period of the SENT signal according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of step S2 in a method according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of step S22 in a method according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of step S3 in a method according to an embodiment of the present invention;
FIG. 7 is a flowchart of step S32 in a method according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a correspondence between a data frame of a collected parameter data segment 1 and an actual physical meaning (pressure) and a correspondence between a data frame of a collected parameter data segment 2 and an actual physical meaning (temperature) in a send interface signal of an intake flow sensor according to a method of an embodiment of the present invention;
FIG. 9 is a schematic diagram of a second embodiment of the present invention;
FIG. 10 is a schematic diagram of a third system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a send signal acquisition module and a send signal processing module in a third system according to an embodiment of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
Example 1
As shown in FIG. 1, the invention provides a SENT interface sensor fault diagnosis method, which comprises the following steps:
s1, acquiring state communication segment data, acquisition parameter data and operation data of an object to be acquired of the analyzed SENT interface sensor, and performing fault diagnosis when a preset fault diagnosis enabling condition is met;
s2, preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
s3, preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
s4, judging whether the first type of faults are larger than a threshold value corresponding to a first preset time period, and if so, executing a step S5; if the judgment result is negative, executing the step S6;
s5, confirming the corresponding first type faults;
s6, re-acquiring state communication segment data, acquisition parameter data and operation data of an object to be acquired of the SENT interface sensor, and performing fault diagnosis again when a preset fault diagnosis enabling condition is met;
s7, judging whether the second type fault is larger than a threshold value corresponding to a second preset time period, and if so, executing the step S8; if the judgment result is negative, executing the step S9;
S8, confirming the corresponding second type faults;
s9, re-acquiring state communication segment data, acquisition parameter data and operation data of an object to be acquired of the SENT interface sensor, and performing fault diagnosis again when a preset fault diagnosis enabling condition is met; wherein the first type of fault is an electrical fault and the second type of fault is a signal fault.
In step S1, the preset fault diagnosis enabling conditions are: the communication state of the SENT interface, the working state of the sensor of the SENT interface and the working state of the object to be acquired are all normal.
According to the time sequence, the data transmitted in each transmission period of the SENT interface can be divided into synchronous segment data, state communication end data, acquisition parameter data segment 1, acquisition parameter data segment 2, CRC (Cyclic Redundancy Check ) check segment and optional stop segment. The SENT bus has the unique ability to transmit data at two different rates simultaneously. Important signals are typically updated with fast channels to achieve high frequencies, such as temperature, pressure, etc., and for non-critical signals, such as diagnostics, etc., can be transmitted on slow channels. A fast channel is a channel that transmits one complete signal per frame, and a slow channel requires multiple frames to transmit one complete signal.
The send signal is transmitted through a series of pulse sequences between two falling edge periods, starting with a sync pulse (sync segment Data) followed by a status/communication signal (status communication end Data), followed by 6 Data Nibbles (Data bytes, i.e. acquisition parameter Data segment 1, acquisition parameter Data segment 2) containing sensor Data, a Data Nibble Data comprising 4 Data bits, and finally a check pulse (CRC check segment) at the end of each packet and inserting a pause pulse (optional stop segment) of a fixed length not exceeding 1 ms. The length of the send message will vary with the nibble value. The specific transmission sequence of the signals is as follows:
as shown in fig. 2-3, the sync segment data starts with a sync pulse whose time interval from the subsequent falling edge is equivalent to 56 clock beats (UT), from which the unit time of beats (the beginning of a transmission period) can be identified, so that the specific value represented by each subsequent data segment is correctly resolved.
The status communication segment data is transmitted after the sync pulse, typically comprising 12 to 27 clock beats.
The acquired parameter data segment 1 and the acquired parameter data segment 2 both contain sensor data information, and up to 6 nibble data can be filled, each byte data can represent a range of 0-15, the information mainly carries analog signals acquired by the sensor, the precision of the analog signals is generally 12 bits, 2 information channels are formed by representing the range of 0-4096,6 nibble data segments, one frame of message is only needed to transmit one complete signal information as a fast channel, and multiple frames of messages are needed to transmit one complete signal information as a slow channel. Each byte of the data signal (acquisition parameter data segment 1, acquisition parameter data segment 2) requires 12 to 27 clock beats.
The CRC check pulse of the CRC check segment is used for error detection and typically comprises 12 to 27 clock beats. The CRC check of the SENT message adopts 4-bit check coding, only encodes 6 nibbles of data, does not contain a state/communication signal (a state communication end), generates a polynomial of X4+X3+1, wherein X represents a variable domain of the polynomial, generates the polynomial and represents bits 11101 by a binary bit string, and divides the remainder of a transmitted data string by the data string as a CRC check code.
Pause pulse signal for optional stop segment: the end of each message may optionally be inserted with a pause pulse of 12-768 beats in length. The SENT message without pause pulse has different transmission data, so that the transmission lengths of the message frames are different, and the length of each message frame can be fixed by introducing the pause pulse.
The fault diagnosis method in the technical scheme of the invention operates in a common single-chip microcomputer (microprocessor), and the common single-chip microcomputer is not internally integrated with a SENT hardware module, but is provided with a general timer EMIOS module and a DMA (Direct Memory Access, direct memory path) module (namely a DMA controller). The analysis of the send signal may use a timer module to collect the length of time between 2 falling edges to analyze the data size, the falling edge of the signal triggering a timer interrupt. The DMA module calculates the number of the ticks according to the detected time interval, the standard 1 ticks are 3us, a certain deviation exists in the actual signal, and the correction can be carried out according to the verification/synchronization pulse. The correction process may be as follows:
The theoretical period of the synchronous pulse in the SENT signal is 56 standard ticks (3 us), and errors of +/-20% of the period length are allowed in actual processing; dividing the actual period of the synchronous pulse by the theoretical period (168 us) during analysis to obtain a correction factor; the actual period of the following data bytes (the acquisition parameter data segment 1 and the acquisition parameter data segment 2) is divided by the correction factor to obtain the theoretical period of the current data byte (the acquisition parameter data segment 1 and the acquisition parameter data segment 2), the difference between the theoretical period and 36us is divided by 3us, and the data value corresponding to the data byte can be obtained, wherein the range of the data value is 0-15.
The DMA module firstly identifies the synchronous pulse of 56 beats according to analysis and decoding of SENT data information, correctly identifies the synchronous pulse, judges the start bit of SENT data, and acquires the corresponding state bit (state communication end), data bit (acquisition parameter data segment 1+acquisition parameter data segment 2) and CRC bit (CRC check segment), so that correct SENT signal information is acquired. The SENT signal information is converted into CAN (Controller Area Network ) information, and the SENT and received messages are edited through configuration of an upper computer (a main body singlechip is operated by a fault diagnosis method and is in communication connection with a CAN bus), so that SENT data CAN be analyzed and displayed in real time.
Specifically, the fault diagnosis method runs a specific implementation process of carrying out SENT information analysis by the main body singlechip:
1) Setting basic communication parameters such as an EMIOS timer, a DMA module, a SENT communication function, a CAN protocol and the like; setting a timing counter to monitor the state of an input signal in real time, and automatically transmitting the captured data to a specified number of variables in a RAM module (Random Access Memory ) by a DMA module;
2) When the SENT signal active edge is captured, DMA and timer interrupts are triggered. The falling edge of the signal triggers the timer to interrupt, and the bus keeps logic 1 in an idle state;
3) Judging whether 56 synchronous clock data are received or not, judging that the synchronous pulse is temporarily considered to be the beginning of a frame if 56 clock beats appear between two SENT signal edges;
4) And acquiring SENT signal state communication segment data, and a complete SENT signal data frame (acquisition parameter data segment 1+acquisition parameter data segment 2) and performing CRC (cyclic redundancy check). The SENT data frame size is resolved according to the length of time between two adjacent falling edges captured by the timer, and the SENT data frame size comprises a synchronous segment, a state segment, a data segment and the like. According to SENT standard protocol, converting into data with real SENT meaning, performing CRC check on the converted data, ensuring the integrity of SENT data, and completing by CRC algorithm in software;
5) CRC check algorithm. The CRC check of the SENT message adopts 4-bit check coding to code 6 nibbles of data without state/communication signals, the CRC check adopts a polynomial X4+X3+1, wherein X represents a polynomial variable domain, a generating polynomial represents bits 11101 by a binary bit string, and the remainder of a transmitted data string divided by the data string is used as CRC check code;
6) And analyzing the obtained complete SENT original data into actual physical values.
Taking an engine intake air flow sensor PFM of a send interface as an example for explanation: the PFM sensor is an intake air flow sensor of the engine, and transmits signals of intake air temperature and intake air pressure of the engine, and each frame of data of the signals is transmitted according to the data shown in fig. 3.
The data variable name stDataSentB1 of the defined state communication section, the variable name DataSentPress of the defined air inlet pressure data section (acquired parameter data section 1) and the variable name DataSentTemp of the defined air inlet temperature data section (acquired parameter data section 2); diagnostic environment settings: setting a diagnosis enabling condition stDiagEn, setting a working state stPFM of a PFM sensor (which can be acquired through state communication segment data), setting a send communication state stCom (which can be acquired through state communication segment data), and setting engine operation condition variables as follows: the engine comprises a rotating speed N, an operating state EngOpSt, an engine load EngLoad, an accelerator pedal signal App, an ambient temperature EnvTemp, an oil injection quantity InjQ and an air inlet system state stBoostSys; 3) The diagnostic enabling conditions are: detecting the normal stcom=1 of the send communication state, the normal stpfm=1 of the pfm sensor working state, and the engine runs normally, namely the normal stboost sys=1 of the air intake system state, and entering fault diagnosis.
In step S2, as shown in fig. 4, step S2 specifically includes:
s21, establishing a corresponding relation between a first type fault zone bit and a first type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
s22, preliminarily determining whether the SENT interface sensor has the first type fault or not according to the first type fault zone bit in the acquired SENT interface sensor state communication section data.
In step S21, a correspondence between a first type fault flag bit and a first type fault in the state communication segment data of the send interface sensor is established, wherein each flag bit represents a fault cause causing the first type fault; specifically, a plurality of first type fault flag bits are set in the state communication end, for example, bit1 is set to 1, and the SENT data line voltage is considered to be too low; bit2 sets 1 to consider the SENT data line voltage to be too high; bit3 sets 1 to consider SENT communication fault; any position 1 in Bit1, bit2 and Bit3 is primarily considered to have an electrical fault.
In step S22, as shown in fig. 5, specifically, the method includes:
s221, if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, executing step S222 if the judgment result is yes; if the judgment result is negative, executing step S223;
S222, preliminarily determining that the SENT interface sensor has a first type of fault;
s223, preliminarily determining that the SENT interface sensor does not have a first type of fault;
s224, primarily determining the fault reason causing the first type fault according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the first type fault in the state communication section data of the SENT interface sensor.
In step S224, determining a failure cause of the first type of failure according to the Bit position of the first type of failure Bit in the acquired state communication segment data of the send interface sensor, wherein the failure cause of the first type of failure is considered to be the first type of failure if Bit1 is set to 1, and the failure cause of the first type of failure is that the voltage of the send data line is too low; if Bit2 is set to 1, a first type of faults are considered to exist, and the fault cause of the first type of faults is that the SENT data line voltage is too high; if Bit3 is set to 1, it is considered that there is a first type of fault, and the cause of the first type of fault is a SENT communication fault.
In step S3, as shown in fig. 6, step S3 specifically includes:
s31, establishing a corresponding relation between a second type fault zone bit and a second type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
S32, preliminarily determining whether the SENT interface sensor has a second type fault or not according to the second type fault zone bit in the acquired SENT interface sensor state communication section data.
In step S31, a correspondence between a second type of fault flag bit and a second type of fault in the status communication segment data of the send interface sensor is established, wherein each flag bit represents a fault cause that causes the second type of fault; specifically, a plurality of second type fault flag bits are set in the state communication end, for example, bit4 is set to 1 to consider that the current SENT signal has a potential error code; bit5 sets 1 to consider that an unreasonable value exists in the current SENT signal; any position 1 in Bit4 and Bit5 is primarily considered to have electrical faults.
As shown in fig. 7, step S32 specifically includes:
s321, if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, executing step S322 if the judgment result is yes; if the judgment result is negative, executing step S323;
s322, judging whether the acquisition parameter data of the SENT interface sensor all meet the preset acquisition range under the condition that the object to be acquired meets the first preset operation condition, and if so, executing step S324; if the judgment result is negative, executing step S323;
S323, preliminarily determining that the SENT interface sensor does not have a second type of fault;
s324, it is preliminarily determined that the send interface sensor has a second type of fault.
S325, primarily determining the fault reason causing the second type fault according to the position of the zone bit corresponding to the second type fault in the acquired zone bit of the second type fault in the state communication section data of the SENT interface sensor.
In step S322, taking the engine intake air flow sensor PFM of the send interface as an example, under the diagnostic conditions of a certain engine speed N, engine load EngLoad, accelerator pedal signal App, fuel injection amount InjQ, and ambient temperature EnvTemp, the preset values of datasetpress and datasettemp may be 1-4088, and if equal to or greater than 4089 or equal to 0, it may be considered that the preset collection range is exceeded, that is, the actual physical value has exceeded the reasonable range of engine operation, then the signal unreasonable fault (the second type of fault) is primarily considered to occur. The diagnostic condition requirements may specifically be: the engine speed is greater than 500rpm (above idle speed), the engine load is greater than 10%, the accelerator pedal is greater than 10%, the fuel injection quantity is greater than 20mg/hub, and the environmental temperature signal is normal.
As shown in fig. 8, the fast channel 1 of the send interface is a 12bit data channel for transmitting an intake pressure signal (acquisition parameter data segment 1), and the fast channel 2 is a 12bit data channel for transmitting an intake temperature signal (acquisition parameter data segment 2). Fig. 8 shows the correspondence between the SENT data frames (the acquired parameter data segment 1 and the acquired parameter data segment 2) transmitted by the send interface sensor and the actual physical values, which are all linearly proportional. Intake pressure: the acquired 12-bit data frame is multiplied by the slope 1.05273 and added with the offset (-103.281) to obtain the actual physical value of the air inlet pressure; intake air temperature: the 12-bit data frame acquired is multiplied by the slope of 0.125, added with the offset of 200, and subtracted by 273.14 to be converted into an actual physical value of the air inlet temperature in degrees. The maximum value of 12-bit original data of SNNT interface sensor SENT data is 4088, and the minimum value is 1. So that it is an unreasonable value when it is equal to or greater than 4089 or equal to 0. When the datasetpress and datasettemp values are equal to or greater than 4089 and equal to 0, or the corresponding physical actual values are out of a reasonable range, any one of the two is satisfied, and the signal unreasonable fault can be considered to occur.
In step S325, determining the failure cause of the second type of failure according to the position of the flag Bit corresponding to the second type of failure in the acquired status communication segment data of the send interface sensor, that is, if Bit4 is set to 1, the second type of failure is considered to exist, and the failure cause of the second type of failure is that the current send signal has a potential error code; if Bit5 is set to 1, it is considered that a second type of fault exists, and the reason for the fault that causes the second type of fault is that the current SENT signal has an unreasonable value.
In steps S7-S8, if an electrical fault (first type fault) or an unreasonable signal fault (second type fault) of the sensor exists for a certain fault tolerance time (a preset time period threshold), the sensor is placed in a "confirmed fault state", and after the confirmed fault occurs, the sensor sends the signal to the upper computer in the form of a fault code through CAN communication. If the fault disappears within the fault tolerance time, the timer stops counting and returns to zero, and if the fault reappears, the timer restarts counting.
In the technical scheme of the invention, whether the SENT interface sensor has a first type of fault is preliminarily determined according to the state communication segment data of the SENT interface sensor; preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data; if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, the corresponding first type fault or second type fault is confirmed, diagnosis of the first type fault and the second type fault is realized, the problem that the fault diagnosis reliability of the SENT interface sensor is low due to the prior art is effectively solved, and the reliability and the accuracy of the fault diagnosis of the SENT interface sensor are effectively improved.
The technical scheme of the invention presets fault diagnosis enabling conditions as follows: the SENT interface communication state, the SENT interface sensor working state and the object working state to be acquired are all normal, and fault diagnosis can be conducted on the SENT interface sensor only when the preset diagnosis enabling conditions are met, so that the problem that diagnosis errors are caused by the fact that the diagnosis enabling conditions are not met and the reliability and the accuracy of fault diagnosis results are affected is avoided.
In the technical scheme of the invention, when a first type of faults are diagnosed, a corresponding relation between a first type of fault zone bit and a first type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the first type of faults; if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, the SENT interface sensor is preliminarily determined to have the first type fault, and the reliability of fault diagnosis is improved; and the fault cause of the first type fault can be preliminarily determined according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the state communication section data of the SENT interface sensor, so that the efficiency of fault diagnosis is improved.
In the technical scheme of the invention, when the second type of faults are diagnosed, the corresponding relation between the second type of fault zone bit and the second type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the second type of faults; if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, judging whether the acquisition parameter data of the SENT interface sensor all meet a preset acquisition range under the condition that an object to be acquired meets a first preset operation condition, if the acquisition parameter data of the SENT interface sensor all meet the preset acquisition range, primarily determining that the SENT interface sensor has the second type fault, and considering the actual operation condition of the object to be acquired in the primary determination of the second type fault, thereby improving the reliability of fault diagnosis; and the fault cause of the second type fault can be determined at first according to the position of the corresponding second type fault zone bit in the acquired SENT interface sensor state communication section data, so that the fault diagnosis efficiency is improved.
Example two
As shown in fig. 9, the technical solution of the present invention further provides a fault diagnosis device for a send interface sensor, including:
the acquiring unit 101 acquires the state communication section data, the acquired parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performs fault diagnosis when the preset fault diagnosis enabling condition is met;
a first determining unit 102 for preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
a second determining unit 103 for preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
the third determining unit 104 confirms the corresponding first type fault or second type fault if the duration of the first type fault or second type fault is greater than the corresponding preset time period threshold, wherein the first type fault is an electrical fault and the second type fault is a signal fault.
In the technical scheme of the invention, whether the SENT interface sensor has a first type of fault is preliminarily determined according to the state communication segment data of the SENT interface sensor; preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data; if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, the corresponding first type fault or second type fault is confirmed, diagnosis of the first type fault and the second type fault is realized, the problem that the fault diagnosis reliability of the SENT interface sensor is low due to the prior art is effectively solved, and the reliability and the accuracy of the fault diagnosis of the SENT interface sensor are effectively improved.
The technical scheme of the invention presets fault diagnosis enabling conditions as follows: the SENT interface communication state, the SENT interface sensor working state and the object working state to be acquired are all normal, and fault diagnosis can be conducted on the SENT interface sensor only when the preset diagnosis enabling conditions are met, so that the problem that diagnosis errors are caused by the fact that the diagnosis enabling conditions are not met and the reliability and the accuracy of fault diagnosis results are affected is avoided.
In the technical scheme of the invention, when a first type of faults are diagnosed, a corresponding relation between a first type of fault zone bit and a first type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the first type of faults; if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, the SENT interface sensor is preliminarily determined to have the first type fault, and the reliability of fault diagnosis is improved; and the fault cause of the first type fault can be preliminarily determined according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the state communication section data of the SENT interface sensor, so that the efficiency of fault diagnosis is improved.
In the technical scheme of the invention, when the second type of faults are diagnosed, the corresponding relation between the second type of fault zone bit and the second type of faults in the state communication section data of the SENT interface sensor is established, and each zone bit represents a fault cause causing the second type of faults; if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, judging whether the acquisition parameter data of the SENT interface sensor all meet a preset acquisition range under the condition that an object to be acquired meets a first preset operation condition, if the acquisition parameter data of the SENT interface sensor all meet the preset acquisition range, primarily determining that the SENT interface sensor has the second type fault, and considering the actual operation condition of the object to be acquired in the primary determination of the second type fault, thereby improving the reliability of fault diagnosis; and the fault cause of the second type fault can be determined at first according to the position of the corresponding second type fault zone bit in the acquired SENT interface sensor state communication section data, so that the fault diagnosis efficiency is improved.
Example III
As shown in fig. 10-11, the technical solution of the present invention further provides a system for diagnosing faults of a send interface sensor, including: the fault diagnosis device comprises a fault diagnosis module 201, a SENT interface sensor 202, a SENT signal acquisition module 203, a communication module 204 and an upper computer 205, wherein the input end of the SENT signal acquisition module 203 is connected with the output end of the SENT interface sensor 202, the output end of the SENT signal acquisition module 203 is connected with the input end of the fault diagnosis module 201, the fault diagnosis module 201 is in communication connection with the upper computer 205 through the communication module 204, and operation data of an object to be acquired are obtained, and the fault diagnosis module 201 is used for carrying out fault diagnosis on the SENT interface sensor according to the data SENT by the SENT interface sensor 202 and the operation data of the object to be acquired.
Further, the fault diagnosis system for the SENT interface sensor provided by the technical scheme of the invention further comprises a power module 206, wherein the power module 206 supplies power to the fault diagnosis module 201, the SENT interface sensor 202, the SENT signal acquisition module 203 and the communication module 204.
The power module 206 may adopt a DCDC power conversion chip TPS57160, and is composed of devices such as an inductance, a freewheeling diode, a resistor, and a capacitor, and converts an input 24V power into a 5V power for providing power supply required by the operation of other modules; the fault diagnosis module (microprocessor) can adopt 32-bit microprocessor MPC5644A of Enzhi pump company to provide the minimum SCM system unit required by the acquisition module; the communication module 204 is a CAN communication module, and adopts a CAN driving chip TJA1051 to convert the analyzed send signal into CAN information, and provide the CAN information to the upper computer 205.
The SENT signal acquisition module 203 comprises a signal line, a 5V power line and a ground line, 5V power supply is provided by the power module 206, a first EMC low-pass filtering module, namely a resistor R1 (560 ohms), a capacitor C1 (2.2 nF) and a capacitor C2 (2.2 nF), is arranged between the SENT signal line and the ground line, one end of the resistor R1 is connected with the output end of the SENT interface sensor 202, the other end of the resistor R1 is connected with one end of the capacitor C1, the other end of the resistor R1 is connected with the ground line, the other end of the resistor R1 is connected with one end of the capacitor C2 (EMIOS interface, timer interface), and the other end of the capacitor C2 is connected with the ground line for filtering SENT signals.
Further, the fault diagnosis system for the SENT interface sensor provided by the technical scheme of the invention further comprises a signal processing module 207, wherein the input end of the signal processing module 207 is connected with the output end of the SENT signal acquisition module 203, and the output end of the signal processing module 207 is connected with the input end of the fault chopping module 201.
The signal processing module 207 performs filtering matching processing on the SENT signal SENT by the SENT sensor signal module, provides a stable signal for a minimum system, and is connected with the fault diagnosis module 201 through a general EMIOS interface; the power supply voltage is pulled up by the 51K pull-up resistor and is provided to the timer EMIOS interface of the fault diagnosis module 201 after passing through the 560 ohm/2.2 nF second EMC low pass filter. Wherein one end of the capacitor Cinput is connected to the send signal, and the other end is grounded, and the value of Cinput can be 68pF; one end of the resistor Rtau1 is connected with the SENT signal, and the other end is connected with the resistor Rf and the capacitor Ctau1, wherein the value of the resistor Rtau1 can be 560 ohms; the other end of the capacitor Ctau1 is grounded, and the value of the capacitor Ctau1 can be 2.2nF; the other end of the resistor Rf is connected with an EMIOS pin of the fault diagnosis module 201, and the value of the resistor Rf can be 10K ohms; one end of the capacitor Cf is connected with the resistor Rf, the other end of the capacitor Cf is grounded, and the value of the capacitor Cf can be 100pF; one end of the resistor Rv is connected with the resistor Rf and the capacitor Cf, and the other end is grounded. The SENT signal acquisition module outputs as an open drain IO interface and suppresses radio frequency noise coupled to the communication line via a second EMC filter, which is also composed of resistors Rtau1, cinput and Ctau1, and transmits an output SENT pulse sequence.
The fault diagnosis module 201 in the technical scheme of the invention can be a microprocessor integrated with a SENT hardware module, can be directly connected with a SENT sensor to realize software and hardware decoding, and directly reads the data information decoded by the SENT module through an MCU; the method CAN also be a common MCU, realizes the decoding of the SENT bus protocol by a timer and a direct memory DMA in the common microprocessor, realizes the acquisition of the data information of the SENT sensor, solves the problem that a SENT module interface is not arranged in the common microprocessor, and sends the data information to an upper computer in a CAN information mode.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. The fault diagnosis method of the SENT interface sensor is characterized in that the fault diagnosis method is operated in a common single-chip microcomputer, and the common single-chip microcomputer is a single-chip microcomputer which is not internally integrated with a SENT hardware module, but is provided with a timer EMIOS module and a DMA module; comprising the following steps:
Acquiring the state communication section data, the acquisition parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performing fault diagnosis when the preset fault diagnosis enabling conditions are met; the analysis of the SENT signal uses a timer EMIOS module to collect the time between 2 falling edges to analyze the data size, and the falling edge of the signal triggers the timer to interrupt; the DMA module calculates the number of the ticks according to the detected time interval, the standard 1 ticks are 3us, and deviation correction can be carried out according to verification or synchronous pulse; the correction process comprises the following steps:
the theoretical period of the synchronous pulse in the SENT signal is 56 standard ticks, and errors of +/-20% of the period length are allowed in actual processing;
dividing the actual period of the synchronous pulse by the theoretical period during analysis to obtain a correction factor; dividing the actual period of the following data byte by the correction factor to obtain the theoretical period of the current data byte, dividing the difference between the theoretical period value of the current data byte and 36us by 3us to obtain the data value corresponding to the data byte, wherein the range of the data value is 0-15;
the DMA module firstly identifies synchronous pulses of 56 beats according to analysis and decoding of SENT data information, judges a SENT data start bit, and acquires corresponding status bits, data bits and CRC bits, so that correct SENT signal information is acquired; the SENT signal information is converted into CAN information, and the SENT and received messages are edited through configuration of an upper computer, so that SENT data are analyzed and displayed in real time;
The specific implementation process of SENT information analysis by the common singlechip is as follows:
setting an EMIOS timer, a DMA module, a SENT communication function and a CAN protocol; setting a timing counter to monitor the state of an input signal in real time, and automatically transmitting captured data to a specified number of groups of variables in a RAM module by a DMA module;
when capturing the effective edge of the SENT signal, triggering DMA and timer interrupt, triggering the timer interrupt by the falling edge of the signal, and keeping logic 1 of the bus in an idle state;
judging whether 56 synchronous clock data are received or not, judging that the synchronous pulse is temporarily considered to be the beginning of a frame if 56 clock beats appear between two SENT signal edges;
acquiring SENT signal state communication segment data, and a complete SENT signal data frame and performing CRC (cyclic redundancy check); analyzing the size of the SENT data frame according to the time between two adjacent falling edges captured by the timer, wherein the size comprises a synchronization section, a state section and a data section; converting the SENT standard protocol into SENT meaning data, performing CRC (cyclic redundancy check) on the converted data, and ensuring the integrity of the SENT data;
the CRC check algorithm is used for carrying out CRC check on the SENT message, 4-bit check coding is adopted for carrying out coding on 6 nibble data, the state or communication signals are not contained, a polynomial X4+X3+1 is adopted for CRC check, X represents a polynomial variable domain, a binary bit string is used for generating a polynomial to represent bits 11101, and the remainder of a transmitted data string divided by the data string is used as a CRC check code;
Resolving the obtained complete SENT original data into an actual physical value;
preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
and if the duration time of the first type fault or the second type fault is larger than the threshold value of the corresponding preset time period, confirming the corresponding first type fault or second type fault, wherein the first type fault is an electrical fault, and the second type fault is a signal fault.
2. The SENT interface sensor fault diagnosis method according to claim 1, wherein the preset fault diagnosis enabling conditions are: the communication state of the SENT interface, the working state of the sensor of the SENT interface and the working state of the object to be acquired are all normal.
3. The method for diagnosing faults of the send interface sensor according to claim 1, wherein the preliminary determination of whether the send interface sensor has the first type of faults according to the state communication segment data of the send interface sensor is specifically as follows:
establishing a corresponding relation between a first type fault zone bit and a first type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
And preliminarily determining whether the SENT interface sensor has the first type fault or not according to the first type fault zone bit in the acquired state communication section data of the SENT interface sensor.
4. The method for diagnosing a fault of a send interface sensor according to claim 3, wherein the preliminary determination of whether the send interface sensor has the first type fault according to the first type fault flag bit in the acquired status communication segment data of the send interface sensor is specifically:
if any one of the first type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the first type fault, preliminarily determining that the SENT interface sensor has the first type fault;
and preliminarily determining the fault reason causing the first type fault according to the position of the zone bit corresponding to the first type fault in the acquired zone bit of the first type fault in the state communication section data of the SENT interface sensor.
5. The method for diagnosing faults of the send interface sensor according to claim 1, wherein the preliminary determination of whether the send interface sensor has the second type of faults according to the operation data of the object to be collected and the collected parameter data is specifically:
Establishing a corresponding relation between a second type fault zone bit and a second type fault in the state communication section data of the SENT interface sensor, wherein each zone bit represents a fault cause causing the first type fault;
and preliminarily determining whether the SENT interface sensor has a second type fault or not according to the second type fault zone bit in the acquired state communication section data of the SENT interface sensor.
6. The method for diagnosing a fault of a send interface sensor according to claim 5, wherein the preliminary determination of whether the send interface sensor has the second type fault according to the second type fault flag bit in the acquired state communication segment data of the send interface sensor is specifically:
if any one of the second type fault zone bits in the acquired SENT interface sensor state communication section data corresponds to the second type fault, judging whether the acquired parameter data of the SENT interface sensor all accord with a preset acquisition range under the condition that an object to be acquired meets a first preset operation condition, and if the acquired parameter data of the SENT interface sensor all accord with the preset acquisition range, primarily determining that the SENT interface sensor has the second type fault;
And primarily determining the fault reason causing the second type fault according to the position of the zone bit corresponding to the second type fault in the acquired zone bit of the second type fault in the state communication section data of the SENT interface sensor.
7. The fault diagnosis device of the SENT interface sensor is characterized in that the fault diagnosis device is arranged in a common single-chip microcomputer, and the common single-chip microcomputer is a single-chip microcomputer which is not internally integrated with a SENT hardware module, but is provided with a timer EMIOS module and a DMA module; comprising the following steps:
the acquisition unit acquires the state communication section data, the acquisition parameter data and the operation data of the object to be acquired of the analyzed SENT interface sensor, and performs fault diagnosis when the preset fault diagnosis enabling condition is met; the analysis of the SENT signal uses a timer EMIOS module to collect the time between 2 falling edges to analyze the data size, and the falling edge of the signal triggers the timer to interrupt; the DMA module calculates the number of the ticks according to the detected time interval, the standard 1 ticks are 3us, and deviation correction can be carried out according to verification or synchronous pulse; the correction process comprises the following steps:
the theoretical period of the synchronous pulse in the SENT signal is 56 standard ticks, and errors of +/-20% of the period length are allowed in actual processing;
Dividing the actual period of the synchronous pulse by the theoretical period during analysis to obtain a correction factor; dividing the actual period of the following data byte by the correction factor to obtain the theoretical period of the current data byte, dividing the difference between the theoretical period value of the current data byte and 36us by 3us to obtain the data value corresponding to the data byte, wherein the range of the data value is 0-15;
the DMA module firstly identifies synchronous pulses of 56 beats according to analysis and decoding of SENT data information, judges a SENT data start bit, and acquires corresponding status bits, data bits and CRC bits, so that correct SENT signal information is acquired; the SENT signal information is converted into CAN information, and the SENT and received messages are edited through configuration of an upper computer, so that SENT data are analyzed and displayed in real time;
the specific implementation process of SENT information analysis by the common singlechip is as follows:
setting an EMIOS timer, a DMA module, a SENT communication function and a CAN protocol; setting a timing counter to monitor the state of an input signal in real time, and automatically transmitting captured data to a specified number of groups of variables in a RAM module by a DMA module;
when capturing the effective edge of the SENT signal, triggering DMA and timer interrupt, triggering the timer interrupt by the falling edge of the signal, and keeping logic 1 of the bus in an idle state;
Judging whether 56 synchronous clock data are received or not, judging that the synchronous pulse is temporarily considered to be the beginning of a frame if 56 clock beats appear between two SENT signal edges;
acquiring SENT signal state communication segment data, and a complete SENT signal data frame and performing CRC (cyclic redundancy check); analyzing the size of the SENT data frame according to the time between two adjacent falling edges captured by the timer, wherein the size comprises a synchronization section, a state section and a data section; converting the SENT standard protocol into SENT meaning data, performing CRC (cyclic redundancy check) on the converted data, and ensuring the integrity of the SENT data;
the CRC check algorithm is used for carrying out CRC check on the SENT message, 4-bit check coding is adopted for carrying out coding on 6 nibble data, the state or communication signals are not contained, a polynomial X4+X3+1 is adopted for CRC check, X represents a polynomial variable domain, a binary bit string is used for generating a polynomial to represent bits 11101, and the remainder of a transmitted data string divided by the data string is used as a CRC check code;
resolving the obtained complete SENT original data into an actual physical value;
the first determining unit is used for preliminarily determining whether the SENT interface sensor has a first type of fault according to the state communication segment data of the SENT interface sensor;
The second determining unit is used for preliminarily determining whether the SENT interface sensor has a second type of fault according to the operation data of the object to be acquired and the acquisition parameter data;
and a third determining unit for confirming the corresponding first type fault or second type fault if the duration time of the first type fault or the second type fault is greater than the threshold value corresponding to the preset time period, wherein the first type fault is an electrical fault and the second type fault is a signal fault.
8. A send interface sensor fault diagnosis system, comprising: the fault diagnosis device comprises a fault diagnosis module, a SENT interface sensor, a SENT signal acquisition module, a communication module and an upper computer, wherein the input end of the SENT signal acquisition module is connected with the output end of the SENT interface sensor, the output end of the SENT signal acquisition module is connected with the input end of the fault diagnosis module, the fault diagnosis module is in communication connection with the upper computer through the communication module to obtain operation data of an object to be acquired, and the fault diagnosis module is used for carrying out fault diagnosis on the SENT interface sensor according to the data SENT by the SENT interface sensor and the operation data of the object to be acquired.
9. The SENT interface sensor fault diagnosis system of claim 8, further comprising a power module that provides power to the fault diagnosis module, the SENT interface sensor, the SENT signal acquisition module, and the communication module.
10. The SENT interface sensor fault diagnosis system according to claim 8, further comprising a signal processing module, where an input end of the signal processing module is connected to an output end of the SENT signal acquisition module, and an output end of the signal processing module is connected to an input end of the fault chopping module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111551963.7A CN114323102B (en) | 2021-12-17 | 2021-12-17 | SENT interface sensor fault diagnosis method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111551963.7A CN114323102B (en) | 2021-12-17 | 2021-12-17 | SENT interface sensor fault diagnosis method, device and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114323102A CN114323102A (en) | 2022-04-12 |
| CN114323102B true CN114323102B (en) | 2024-01-19 |
Family
ID=81053273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111551963.7A Active CN114323102B (en) | 2021-12-17 | 2021-12-17 | SENT interface sensor fault diagnosis method, device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114323102B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012057378A1 (en) * | 2010-10-27 | 2012-05-03 | 파웰테크윈(주) | Universal sensor self-diagnosis device and diagnosis method therefor |
| EP2589943A1 (en) * | 2011-11-02 | 2013-05-08 | Vestas Wind Systems A/S | Methods and Systems for Detecting Sensor Fault Modes |
| CN104062967A (en) * | 2013-03-20 | 2014-09-24 | 广州汽车集团股份有限公司 | Fault diagnosis method and device of start stop system |
| KR20160074106A (en) * | 2014-12-18 | 2016-06-28 | 현대모비스 주식회사 | Synchronization method of the sensor data |
| KR101745199B1 (en) * | 2015-12-09 | 2017-06-09 | 현대자동차주식회사 | Failure detection method of sensor |
| CN107707446A (en) * | 2017-09-04 | 2018-02-16 | 中国电子科技集团公司第四十研究所 | A kind of SENT bus encoding/decodings, triggering and analysis method based on FPGA |
| CN108197014A (en) * | 2017-12-29 | 2018-06-22 | 东软集团股份有限公司 | Method for diagnosing faults, device and computer equipment |
| KR20190015891A (en) * | 2017-08-07 | 2019-02-15 | 주식회사 만도 | Sensor fault detection method using SENT protocol |
| CN111026085A (en) * | 2019-12-19 | 2020-04-17 | 中国重汽集团济南动力有限公司 | DPF damage fault diagnosis system and method and heavy-duty diesel vehicle |
| CN111963287A (en) * | 2020-08-21 | 2020-11-20 | 中国重汽集团济南动力有限公司 | OBD interaction system, method and device for vehicle engine and post-processing |
| CN112362365A (en) * | 2020-12-09 | 2021-02-12 | 吉林大学 | EPS system fault injection test platform and test method based on SCALEXIO |
| CN112911625A (en) * | 2021-02-04 | 2021-06-04 | 重庆邮电大学 | Fault diagnosis method for deterministic time slot communication sensing node |
| CN113179192A (en) * | 2021-04-15 | 2021-07-27 | 常州易控汽车电子股份有限公司 | SENT protocol test system and method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6542096B2 (en) * | 2015-10-13 | 2019-07-10 | 住友重機械工業株式会社 | Failure diagnosis system |
-
2021
- 2021-12-17 CN CN202111551963.7A patent/CN114323102B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012057378A1 (en) * | 2010-10-27 | 2012-05-03 | 파웰테크윈(주) | Universal sensor self-diagnosis device and diagnosis method therefor |
| EP2589943A1 (en) * | 2011-11-02 | 2013-05-08 | Vestas Wind Systems A/S | Methods and Systems for Detecting Sensor Fault Modes |
| CN104062967A (en) * | 2013-03-20 | 2014-09-24 | 广州汽车集团股份有限公司 | Fault diagnosis method and device of start stop system |
| KR20160074106A (en) * | 2014-12-18 | 2016-06-28 | 현대모비스 주식회사 | Synchronization method of the sensor data |
| KR101745199B1 (en) * | 2015-12-09 | 2017-06-09 | 현대자동차주식회사 | Failure detection method of sensor |
| KR20190015891A (en) * | 2017-08-07 | 2019-02-15 | 주식회사 만도 | Sensor fault detection method using SENT protocol |
| CN107707446A (en) * | 2017-09-04 | 2018-02-16 | 中国电子科技集团公司第四十研究所 | A kind of SENT bus encoding/decodings, triggering and analysis method based on FPGA |
| CN108197014A (en) * | 2017-12-29 | 2018-06-22 | 东软集团股份有限公司 | Method for diagnosing faults, device and computer equipment |
| CN111026085A (en) * | 2019-12-19 | 2020-04-17 | 中国重汽集团济南动力有限公司 | DPF damage fault diagnosis system and method and heavy-duty diesel vehicle |
| CN111963287A (en) * | 2020-08-21 | 2020-11-20 | 中国重汽集团济南动力有限公司 | OBD interaction system, method and device for vehicle engine and post-processing |
| CN112362365A (en) * | 2020-12-09 | 2021-02-12 | 吉林大学 | EPS system fault injection test platform and test method based on SCALEXIO |
| CN112911625A (en) * | 2021-02-04 | 2021-06-04 | 重庆邮电大学 | Fault diagnosis method for deterministic time slot communication sensing node |
| CN113179192A (en) * | 2021-04-15 | 2021-07-27 | 常州易控汽车电子股份有限公司 | SENT protocol test system and method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 基于自适应SENT协议的电机控制系统设计;黄鹏;杜克奎;荣锋;鲁勇;;天津工业大学学报;第35卷(第02期);85-90 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114323102A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019128929A1 (en) | Obd interface bus type detection method and device | |
| CN112068536A (en) | Universal self-adaptive vehicle remote diagnosis method, device and system | |
| CN111800380A (en) | Sent signal simulation analysis platform based on J2716 protocol | |
| CN109088763B (en) | Daisy chain communication fault diagnosis and processing method for battery management system | |
| CN114323102B (en) | SENT interface sensor fault diagnosis method, device and system | |
| CN102082535B (en) | Brushless direct current motor speed detector based on hall element and control method thereof | |
| CN201569663U (en) | Brushless DC motor speed measurement device based on hall element | |
| CN113295445A (en) | Vibration signal acquisition and fault real-time monitoring system and method for rotary machine | |
| CN101221461B (en) | Reset circuit and reset method for embedded system | |
| CN113911254B (en) | Motor and electric power-assisted bicycle driving system | |
| CN2852221Y (en) | Rotary speed measure control card and its decentralized control system | |
| CN101378239A (en) | Method and apparatus for controlling rotor position of electric machine | |
| CN113691340A (en) | Ring main unit digital terminal based on Manchester coding and data transmission method thereof | |
| CN215058390U (en) | Novel fan controller | |
| CN105785851A (en) | SENT protocol frame data parsing converter data sampling parsing system | |
| CN103206308A (en) | Method for safety monitoring system of gasoline ECU (engine control unit) | |
| CN113341922B (en) | Domain controller fault diagnosis system based on LCM | |
| JP3089905B2 (en) | Communication system for vehicle diagnosis | |
| CN101324634B (en) | Vehicle speed sensor with bus interface for vehicle | |
| CN103529449B (en) | Reverse radar system | |
| CN210839807U (en) | Motor vehicle video recording controller and motor vehicle video recording control system | |
| CN114495323A (en) | Communication driving circuit for mining diesel vehicle protection device | |
| CN110243614B (en) | Detection system for automobile exhaust SCR | |
| CN111694346A (en) | OBD universal protocol converter | |
| CN102266621B (en) | Data acquisition equipment of anesthesia machine, status detection method thereof and anesthesia machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |