CN101949713B - Diagnostic automobile combined instrument, instrument diagnostor and instrument diagnosing method - Google Patents
Diagnostic automobile combined instrument, instrument diagnostor and instrument diagnosing method Download PDFInfo
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- CN101949713B CN101949713B CN2009103042310A CN200910304231A CN101949713B CN 101949713 B CN101949713 B CN 101949713B CN 2009103042310 A CN2009103042310 A CN 2009103042310A CN 200910304231 A CN200910304231 A CN 200910304231A CN 101949713 B CN101949713 B CN 101949713B
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Abstract
The invention discloses a diagnostic automobile combined instrument, an instrument diagnostor and an instrument diagnosing method. The existing automobile combined instrument is improved, is provided with a serial communication interface with a diagnostic function and is matched with the automobile instrument diagnostor for use, thus realizing accurate diagnosis on specific faulted instruments, fault reasons and quantized sampling value errors, and providing direct basis for accurately judging the faulted parts, thereby shortening the maintenance time and effectively lowering the overhaul cost. The diagnostic automobile combined instrument comprises an instrument singlechip, an instrument interface circuit and an instrument output circuit, a serial communication channel is arranged in the instrument interface circuit, serial data ports SDA1 and SDL1 as well as control ports SDC1 and ACT1 are arranged in the instrument singlechip, and a bidirectional four-way analogue switch COMS chip is respectively connected with a control communication channel and a pair of digital pulse input circuits in a digital signal sensor interface circuit.
Description
Technical field
The present invention relates to be used for diagnosis type automobile combination meter, instrument diagnostor and the instrument diagnostic method of automobile failure diagnosis and fault verification, belong to mechanical manufacturing field.
Background technology
Be accompanied by the raising of living standard and consuming capacity, domestic automobile is sold use amount significantly to be increased, and the maintenance of automobile and maintenance market also more and more have competitiveness.
The full amount of having in the market of present high-grade automobile is not high, most of automobiles still be middle-grade or family popular.Present high-grade automobile has possessed the electronic diagnostic system of band CAN communication bus interface, and the automobile combination meter that matches with it also just has this type of diagnostic function, in the socket and wire harness plug of these automobile instruments, also has CAN and leads to
News EBI jack, contact pin.
Most of non-high-grade automobiles then do not possess this type of self-diagnostic function; Owing to do not have electronic diagnostic system; Promptly do not possess the CAN communication bus, when occurring instrument when driving and show problem, can't clarify a diagnosis out usually is instrument fault, sensor fault, or wire harness articulation issues.Current main diagnostic means is to carry out separately fault judgement through changing instrument, sensor or wire harness successively.Because the repair and replacement process is comparatively complicated; Maintenance personal's quality problem in addition; The erroneous judgement of instrument fault occurs and the normal instrument that will not break down is changed through regular meeting, thereby increased maintenance cost, caused a large amount of goods and materials wastes also for automobile production supplier.The distortion of the instrument quality diagnosis data that this type of is existing and maintenance personal's is not controlled, is the technical barrier of puzzlement automobile production supplier, instrument factory and maintenance producer always.
If in the combination instrument of existing non-high-grade automobile, increase the CAN communication bus interface; Then need a large amount of design, the productions of revising existing matching instrument of automobile instrument factory with regard to realizing self-diagnostic function; Comprise and revise appliance circuit plate, meter case and wire harness plug etc.; Also need increase parts such as meter socket extraly, this all can correspondingly increase vehicle complete vehicle and produce and sell price.For automobile production supplier, also need consume bigger expense and carry out the vehicle modification, therefore this technology modification is difficult to by recognition and acceptance.
Like the following technical solution that is provided of formerly applying for a patent; Number of patent application is 200710112965.X; Name is called automobile instrument integral detection method; Its signal that adopts the program control signal generator to send is sent to the instrument that needs detection after the power amplification amplitude is regulated, the signal that the resistance signal system that resistance plate and resistance control panel are formed sends also is sent to the instrument that need detect, and the signal that instrument is sent detects through the output voltage detection system again judges whether instrument is qualified.
Particularly, the single-chip microcomputer 16F873A in the program control signal generator produces square-wave signal through keypad information is analyzed with computing, through frequency division integer predetermined frequency value and output frequency value, is sent to LCD display with serial mode and shows again.In the resistance signal system, detect the waver and the resnstance transformer position of the switch by single-chip microcomputer.
Like above-mentioned patent, existing quality testing to automobile instrument only is the analog generator of similar vehicle signal, thus signals such as the speed of a motor vehicle of simulating, mileage, rotating speed, water tank temperature, amount of fuel, air pressure.When exporting to vapour
Through operator individual's visual observation, judge the quality and the precision of automobile instrument during the car instrument.Obviously these class methods do not have the detection means of employing and the direct communication of automobile instrument; After receiving instrument sensory feedback information, can't carry out failure modes clearly, quantitatively; Be the sensor signal interface circuit, or instrument indicating section circuit breaks down? Also just can't be deposited in diagnostic message (comprising failure cause, diagnostic operation record etc.) on the automobile instrument, for follow-up automobile instrument quality management provides effective historical data reference.
Summary of the invention
Diagnosis type automobile combination meter of the present invention, instrument diagnostor and instrument diagnostic method are intended to address the above problem and propose the apparatus and method to existing non-high-grade automobile combination meter diagnosis.
The objective of the invention is; Improve existing automobile combination meter; Make it have the serial communication interface that carries diagnostic function; Be used the accurate diagnosis of concrete instrument, failure cause and sampled value error quantization that the automobile instrument diagnostor realizes breaking down, direct foundation be provided, and then shorten servicing time, reduce the cost of overhaul effectively for judging trouble unit exactly.
Goal of the invention also is; Realize a kind of instrument diagnostic system and method at the scene; Not only reduced the maintenance personal work load, but also correspondingly improved the vehicle maintenance quality, also the technical support of setting up instrument follow-up of quality system is provided simultaneously for car manufactures, fittings supply merchant.
Another goal of the invention is; Adopt the present invention to carry out compatibility with the combination instrument of existing non-high-grade automobile; Need not meter socket function, meter case or wire harness plug are changed, therefore can avoid effectively because of carrying out the huge investment and the market risk that the vehicle transformation brings to car manufactures.
For realizing the foregoing invention purpose, described diagnosis type automobile combination meter mainly comprises following structure:
The instrument single-chip microcomputer has the signal input, display prot, drive output port and the storer that connect the instrumentation tap circuit;
The instrumentation tap circuit has digital signal sensors interface circuit, analog signal sensors interface circuit and switching value signal interface circuit;
The instrument output circuit has the liquid crystal display drive circuit of motor-drive circuit, connection mileage LCD, the on-off circuit of connection alarm lamp group, it is characterized in that:
In the instrumentation tap circuit, be provided with a serial communication passage,
In the instrument single-chip microcomputer, be provided with serial data port SDA1, SDL1 and control port SDC1, ACT1,
A two-way four-way analog switch COMS chip connects a pair of digit pulse input channel in control communication channel, the digital signal sensors interface circuit respectively,
In socket 1A, a pair of jack Z1AV, Z1AS be a pair of digit pulse input channel of control linkage speed V in, rotating speed Sin respectively, or connects serial communication passage SDA1, SDL1, realizes sharing a pair of wire harness XV, XS.
Like above-mentioned scheme characteristic, described diagnosis type automobile combination meter can be operated in following two states,
A kind of is the duty of going, when combination instrument with after automotive wire bundle is connected, combination instrument is in the duty of going, can accomplish collection, the data presentation for sensor parameters such as the speed of a motor vehicle, mileage, rotating speed, water tank temperature, amount of fuel, air pressure this moment.Also realize the light symbol indication of driving conditions such as steering indicating light, securing band, illuminating lamp and exhaust brake simultaneously.
Another kind is the diagnostic work state, when combination instrument with after after the automobile instrument diagnostor stated is connected, power on back and get into diagnostic state of combination instrument.The a pair of digit pulse input channel and the serial communication passage of combination instrument are accepted the control of bidirectional analog switch COMS chip respectively, thereby realize the compound use passage under a kind of switching state.
Sending simulated automotive at the automobile instrument diagnostor to combination instrument goes in the various control signals of duty; Through the serial communication passage receive the combination instrument feedback each sensor measured signal value, with error threshold basis relatively on, realize diagnosis to combination instrument fault, failure cause and data-measuring.
The present invention provides a kind of automobile instrument diagnostor, and it mainly includes following structure:
The diagnostor single-chip microcomputer, have the signal output that connects signal output apparatus, controlling and driving display display prot, be used for carrying out RS232 serial communication interface, the storer of communication with the diagnostic message management system terminal;
Signal output apparatus has digital signal output circuit, simulating signal output circuit, switching value signal output apparatus and automobile instrument analog power output control circuit;
The serial communication passage is arranged in the digital signal output circuit;
A two-way four-way analog switch COMS chip, a pair of digit pulse output channel in control linkage serial communication passage, the digital signal output circuit respectively;
Wire harness, wire harness comprise 2 plugs and connect automotive diagnostic unit and diagnosis type automobile combination meter respectively;
And, the automobile instrument analog power.
Further refinement scheme is, respectively comprises 2 jacks in the wire harness both sides plug of connection automotive diagnostic unit and diagnosis type automobile combination meter, connects a pair of wire harness XV, XS,
Described serial communication passage and a pair of digit pulse output channel are shared a pair of wire harness XV, XS.
In addition, a pair of digit pulse output channel that bidirectional analog switch COMS chip controls connects is respectively vehicle speed pulse output channel and tacho-pulse output channel.
The present invention provides a kind of automobile instrument diagnostic method, and the practical implementation means include:
The wire harness that employing is complementary, connection diagnostic type automobile combination meter and automobile instrument diagnostor,
To diagnosis type automobile combination meter data communication and analog power are provided by the automobile instrument diagnostor,
Send digital signal, simulating signal and switching value signal under the simulated automotive transport condition through the automobile instrument diagnostor to diagnosis type automobile combination meter,
According to combination instrument measured data and the signal that the serial communication passage feeds back to, diagnose and fault verification to combination instrument, sensor or wire harness articulation issues.
In above-mentioned automobile instrument diagnostic method, to the diagnosis of combination instrument, include automobile instrument energising detection, the diagnosis of switching value signal path, sensor signal interface circuit diagnostics, and the diagnosis of automobile instrument indicating section.
Behind diagnosis and fault verification; Diagnostic message to diagnosis type automobile combination meter; Such as information such as automobile instrument model, record diagnosis result, diagnosis date, be stored in the storer of instrument single-chip microcomputer, can be used for the automobile instrument quality management system.
As stated, diagnosis type automobile combination meter of the present invention, automobile instrument diagnostor and automobile instrument diagnostic method
Have the following advantages and beneficial effect:
Improve the diagnostic device and the method for existing non-high-grade automobile combination meter,, can directly shorten servicing time, reduce the cost of overhaul effectively for judgement, the fault of at the scene tracing trouble quantizes a kind of accurately diagnostic mode is provided.The diagnostic result of fault type, reason comes into plain view, and has stopped the instrument waste that causes because of maintenance personal's irresponsibility.
The instrument diagnostic method of being realized at the scene can reduce maintenance personal's work load, raising vehicle maintenance quality simultaneously.
Can the technical support of setting up instrument follow-up of quality system be provided for car manufactures, fittings supply merchant.
The present invention and existing non-high-grade automobile combination meter can be compatible, need not meter socket function, meter case or wire harness plug are changed, and therefore can avoid effectively because of carrying out the huge investment and the market risk that the vehicle transformation brings to car manufactures.
Description of drawings
Further specify the present invention with reference to following accompanying drawing;
Fig. 1 is said bidirectional analog switch COMS chip structure synoptic diagram;
Fig. 2 is that combination instrument is connected the structural representation that uses with diagnostor;
Fig. 3 is automobile instrument energising testing process figure;
Fig. 4 is an automobile instrument switching value signal path diagnostic flow chart;
Fig. 5 is a diagnosis automobile instrument sensor path process flow diagram;
Fig. 6 is a diagnosis car speed sensor path process flow diagram;
Fig. 7 is a diagnosis automobile rotational speed sensor path process flow diagram;
Embodiment
Embodiment 1, and is as shown in Figure 2, and the described diagnosis type of present embodiment automobile combination meter mainly includes: the instrument single-chip microcomputer has the signal input, display prot, the drive output port that connect the instrumentation tap circuit
And storer;
The instrumentation tap circuit has digital signal sensors interface circuit, analog signal sensors interface circuit and switching value signal interface circuit;
The instrument output circuit has the liquid crystal display drive circuit of motor-drive circuit, connection mileage LCD, the on-off circuit of connection alarm lamp group.
In the instrumentation tap circuit, be provided with a serial communication passage,
In the instrument single-chip microcomputer, be provided with serial data port SDA1, SDL1 and control port SDC1, ACT1,
A two-way four-way analog switch COMS chip connects a pair of digit pulse input channel in control communication channel, the digital signal sensors interface circuit respectively,
In socket 1A, a pair of jack Z1AV, Z1AS be a pair of digit pulse input channel of control linkage speed V in, rotating speed Sin respectively, or connects serial communication passage SDA1, SDL1, realizes sharing a pair of wire harness XV, XS.
Described serial communication passage and vehicle speed pulse input channel, tacho-pulse input channel are shared a pair of wire harness, thereby form switchable compound use passage, are used for combination instrument and diagnostor and carry out data interaction.
Particularly,
1, instrument single-chip microcomputer is the control core of automobile combination meter, is divided into following module again by its function,
A, signal input connect the automobile instrument interface circuit, gather the switch of automobile instrument sensor parameters and driving condition.
B, display prot, through liquid crystal display drive circuit, control mileage LCD shows distance travelled.
C, drive output port drive the submeter motor, drive the alarm lamp group through on-off circuit through motor-drive circuit (4 tunnel).
D, storer when dispatching from the factory, have the data such as model, the date of production of this instrument, after diagnosis finishes, and the record diagnosis result, the data such as numbering of diagnosis date, the diagnostor that links with it are used for the instrument quality management system.
2, the serial communication passage is as shown in Figure 1,
A, under serial comm state, K11, K13 bidirectional analog switch (COMS4066 chip), in SDC1 control conducting down, SDA1, SDL1 formation I2C serial communication path.
Simultaneously, K12, K14 switch turn-off under ACT1 control, and the speed of a motor vehicle, tach signal input channel cut off.
B, under the speed of a motor vehicle, tach signal input state, K12, K14 bidirectional analog switch (COMS4066 chip), conducting under ACT1 control, R11, C11, D11 constitute GES input channel (Vin).
Simultaneously, R12, C12, D12 constitute tach signal input channel (Sin) connection.
In addition, K11, K13 switch turn-off under SDC1 control, and the serial communication path cuts off.
3, instrumentation tap circuit is nursed one's health the automobile instrument sensor signal, satisfies instrument single-chip microcomputer input requirement, also for driving the sign condition pilot lamp power supply and suitable current is provided, and satisfies switch control and brightness requirement, include,
A, digital signal sensors interface circuit are nursed one's health into 5V with pulse amplitude, like vehicle speed pulse, tacho-pulse and the sensor exported with the PWM mode;
B, analog signal sensors interface circuit are nursed one's health into the aanalogvoltage of 0-5V with resistance value, magnitude of voltage and current value, like the sensor with resistance value, voltage, current system output such as water tank temperature, amount of fuel, air pressure;
C, switching value signal interface circuit, the vehicle condition switching signal is nursed one's health into instrument, and " the needed electric current of driving condition symbol indicating lamp is like on off states such as steering indicating light, securing band, illumination and exhaust brakes.
4, instrument output circuit receives the monolithic processor controlled output circuit of automobile instrument, mainly includes motor-drive circuit, mileage liquid crystal display drive circuit, alarm lamp on-off circuit.
Like the structrual description of above-mentioned automobile combination meter, combination instrument existing and of the present invention has a plurality of data indicating gauges, such as including speedometer, tachometer gage, water-thermometer, fuel gauge and rain glass, sketches and is " submeter ".
The data of submeter indication are respectively travel speed (V), engine speed (S), water tank temperature (T), amount of fuel (L) and air pressure (P), sketch into " submeter physical quantity (Xi) " (i=0,1,2, Be submeter scale number).
Submeter corresponding sensor type is respectively vehicle speed pulse sensor, tacho-pulse sensor, water temperature electric resistance sensor, amount of fuel swept resistance sensor, air pressure strain bridge sensor, sketches to be " branch table sensor ".
The signal that divides table sensor to export is respectively vehicle speed pulse frequency values, tacho-pulse frequency values, water temperature resistance value, amount of fuel swept resistance value, air pressure strain bridge magnitude of voltage, sketches to be " submeter signal value (AXi) ".
Above-mentioned submeter signal value, pass through automobile instrument " instrumentation tap circuit " conditioning respectively after, gathered by the instrument single-chip microcomputer, this type of image data summary is " submeter sampled value (DXi) ".
The original standard sample value that submeter physical quantity (Xi) is corresponding is sketched and is " submeter standard value (MXi) ".
The sampled value error=| DXi-MXi|, it is regarded as the error range of permission, and below summary is " submeter error threshold (DMXi) ".
The above-mentioned diagnosis type automobile combination meter following two states of can working:
1, the duty of going, when being connected with automotive wire bundle, instrument is in the duty of going, and accomplishes the sensor parameters collection and the data indication of automobile speed, mileage, rotating speed, water tank temperature, amount of fuel, air pressure.And the light symbol that can realize driving conditions such as steering indicating light, securing band, illuminating lamp and exhaust brake is indicated.
2, diagnostic work state; When being connected with following automobile instrument diagnostor, after powering on, instrument gets into diagnostic state, and vehicle speed pulse input, vehicle speed pulse input channel and the serial communication path of instrument are shared a pair of wire harness; Form compound use passage; According to the instruction that diagnostor sends, vehicle speed pulse input, vehicle speed pulse input, serial communication input and communication output are realized in timesharing ground, carry out data interaction with diagnostor.
As shown in Figure 2, the described automobile instrument diagnostor of present embodiment mainly includes:
The diagnostor single-chip microcomputer, have the signal output that connects signal output apparatus, controlling and driving display display prot, be used for carrying out RS232 serial communication interface, the storer of communication with the diagnostic message management system terminal;
In the diagnostor single-chip microcomputer, be provided with serial data control port SDA2, SDL2;
Signal output apparatus has digital signal output circuit, simulating signal output circuit, switching value signal output apparatus and automobile instrument analog power output control circuit;
The serial communication passage is arranged in the digital signal output circuit;
A bidirectional analog switch COMS chip, a pair of digit pulse output channel in difference control linkage serial communication passage, the digital signal output circuit, this is respectively vehicle speed pulse output channel and tacho-pulse output channel to the digit pulse output channel.
A pair of wire harness with 2 plugs, wire harness connect automobile instrument diagnostor and diagnosis type automobile combination meter respectively.
Serial communication passage and vehicle speed pulse output channel, tacho-pulse output channel are shared above-mentioned a pair of wire harness.
And, the automobile instrument analog power.
Particularly,
1, diagnostor single-chip microcomputer is a control core of implementing fault diagnosis, is divided into again by function,
A, signal output are used to connect signal output apparatus, are the CSs of analogue instrument sensor parameters and driving condition;
B, display prot, controlling and driving LCD, monitoring diagnostic operational process and diagnostic result;
The combination button signal is accepted in C, button input port, operates diagnostic procedure, browses diagnostic message;
D, storer; Can store the Diagnostic parameters of 10 groups of model combination instruments, such as " submeter signal value (AXi) ", " submeter standard value (MXi) ", " submeter error threshold (DMXi) " that include simulation combination instrument " submeter physical quantity (Xi) " institute's respective sensor.These 10 groups of data are sent to the terminal of following diagnostic message management system through the RS232 serial communication interface, are used for diagnostic procedure;
Also can keep in the management data and the diagnostic result of 20 groups of combination instruments, such as include automobile instrument model, the date of production, record diagnosis result, diagnosis date, the data such as numbering of the diagnostor that links with it.These 20 groups of data can send the terminal of following diagnostic message management system through the RS232 serial communication interface to, are used for the instrument quality management system;
E, RS232 serial communication interface are used for diagnostor and diagnostic message management system terminal carries out communication, accept the computer settings data, are transferred to the computer diagnosis result.
2, signal output apparatus in order to the simulated automotive gauge sensor, mainly includes,
The output of A, digital signal is like vehicle speed pulse, tacho-pulse and the sensor exported with the PWM mode;
B, simulating signal output are like the sensor with resistance value, voltage, current system output such as water tank temperature, amount of fuel, air pressure;
C, the output of switching value signal are like on off states such as steering indicating light, securing band, illumination and exhaust brakes;
D, automobile instrument power supply control output are switched on or switched off the automobile instrument power supply by the diagnostor Single-chip Controlling.
3, serial communication passage is shared a pair of wire harness with vehicle speed pulse output channel, tacho-pulse output channel, thereby is formed compound communication channel, carries out data interaction with combination instrument.Its principle of work is following,
A, under serial comm state, K21, K23 bidirectional analog switch (COMS4066 chip), in SDC2 control conducting down, SDA2, SDL2 formation I2C serial communication path;
Simultaneously, K22, K24 switch turn-off under ACT2 control, and the speed of a motor vehicle, tach signal output channel cut off.
B, under the speed of a motor vehicle, tach signal output state, K22, K24 bidirectional analog switch (COMS4066 chip), in ACT2 control conducting down, R21 constitutes GES output channel (Vout) and R22 constitutes tach signal output channel (Sout) connection;
Simultaneously, K21, K23 switch turn-off under SDC2 control, and the serial communication path cuts off.
4, wire harness is a pair of, promptly disposes 2 plugs, and a plug links to each other with diagnostor, and another plug links to each other with automobile combination meter, and the size of this plug, contact pin ordering are complementary with the model of combination instrument.
To shown in Figure 7, present embodiment has been realized following diagnostic message management system, automobile instrument diagnostic method based on above-mentioned diagnosis type automobile combination meter and automobile instrument diagnostor like Fig. 1.Particularly,
Set up the diagnostic message management system, needs dispose following apparatus and computing machine is soft, hardware platform,
1, hardware environment: more than the Peutium4 1.8G 256 MB of memory, band RS232 serial communication interface;
2, software environment: operating system Microsoft Windows XP Profesional;
3, development platform: can use the LabVIEW of America NI company software platform;
4, the major function that realizes has, according to the model of automobile instrument, and the jack function of definition diagnostor accessory power outlet; Set " submeter signal value (AXi) ", " submeter standard value (MXi) ", " submeter error threshold (DMXi) " of the output of imitation automobile instrument " submeter physical quantity (Xi) " respective sensor; They comprise the speed of a motor vehicle, mileage, rotating speed, water tank temperature, amount of fuel, air pressure, send to diagnostor through the RS232 serial communication interface;
Set the output of imitation automobile instrument switching value signal; Like on off states such as steering indicating light, securing band, illumination and exhaust brakes; Driving current value allowed band, jack definition, diagnostic sequence that its symbol indicating lamp is required send to diagnostor through the RS232 serial communication interface;
The diagnostic result data management; These data are through the reception of RS232 serial communication interface and from diagnostor; Can include automobile instrument model, the date of production, record diagnosis result, diagnosis date, the information such as numbering of the diagnostor that links with it, be used for the automobile instrument quality management system.
Described automobile instrument diagnostic method, mainly realize following fault diagnosis and decision process:
The wire harness that employing is complementary, connection diagnostic type automobile combination meter and automobile instrument diagnostor,
To diagnosis type automobile combination meter the analog power of data communication and demonstration is provided by the automobile instrument diagnostor,
Send digital signal, simulating signal and switching value signal under the simulated automotive transport condition through the automobile instrument diagnostor to diagnosis type automobile combination meter,
According to combination instrument measured data and the signal that the serial communication passage feeds back to, diagnose and fault verification to combination instrument, sensor, wire harness articulation issues.
Diagnostic message to diagnosis type automobile combination meter is stored in the storer of instrument single-chip microcomputer.
To the diagnosis of combination instrument and sensor, include that automobile instrument energising detects, the diagnosis of switching value signal path, sensor signal interface circuit diagnostics, and the speed of a motor vehicle, signals of rotational speed sensor diagnosis.
Wherein, according to the model of the automobile instrument that will diagnose, the wire harness of selection and its coupling is connected with diagnostor.Closed diagnostor power switch K, diagnostor entering work, through the prompting of diagnostor LCD, and group
Close key operation and choose the model of this automobile instrument; The jack function of assurance diagnostor accessory power outlet and ordering, the needed data of diagnosis (comprising the speed of a motor vehicle, mileage, rotating speed, water tank temperature, amount of fuel, air pressure signal parameter) are complementary with this model automobile instrument.
1, the automobile instrument energising detects:
A, diagnostor connect the automobile instrument power supply, and simultaneously, the vehicle speed pulse delivery outlet (Vout) through diagnostor sends particular frequencies, and this frequency is far above max. speed pulse output frequency (2 times), continue a period of time (2 second) after, stop particular frequencies output.Subsequently, diagnostor converts serial comm state to, waits for and accepts " energising detects data " that automobile instrument sends, and these data comprise: the model of instrument, the date of production, mileage number.
After B, automobile instrument powered on, (Vin) measured this particular frequencies through the vehicle speed pulse input port, and back of lasting a period of time (2 second) confirms that automobile instrument gets into diagnostic state.Subsequently, automobile instrument converts serial comm state to, sends " energising detects data " to diagnostor.
After C, diagnostor receive " energising detect data ", wherein " automobile instrument model " model with the automobile instrument of choosing is before compared,, confirm automobile instrument " energising detects normal ", can continue follow-up diagnosis if model is identical; Otherwise the model of transposing diagnostor automobile instrument is selected, and comes back to the detection of switching on of A item; If, through repeatedly detecting again, still can not normally pass through, confirm automobile instrument " energising detection failure ".
2, automobile instrument switching value signal path diagnosis:
Diagnostor is given status indicator lamp energisings such as steering indicating light, securing band, illumination and exhaust brake in order, monitors each pilot lamp driving current value, if drive current is excessive, too small, diagnostor writes down this pilot lamp current failure automatically; No abnormal when the pilot lamp drive current, viewing lamp again if pilot lamp brightness is unusual, uses the LCD prompting of diagnostor and push-button combination operated, notes this pilot lamp brightness fault.Diagnose in order when whole switching value signals to finish, diagnostor is transferred to diagnostic result the automobile instrument storage through communication port and keeps, and subsequently, gets into the sensor signal diagnosis automatically.
3, automobile instrument sensor signal interface circuit diagnostics (except the speed of a motor vehicle, the speed probe, the speed of a motor vehicle, rotating speed transmission line are used for serial communication):
Diagnostor is diagnosed each scale value (Xi) of the physical quantity of certain submeter in order, accomplish all scales after, carry out the diagnosis of next submeter again, concrete steps are following:
A, the diagnosis of automobile instrument submeter signal interface circuit:
Automobile sensor simulating signal of diagnostor output: i.e. " submeter physical quantity (Xi) " corresponding " submeter signal value (AXi) "; Give an order to automobile instrument through serial communication interface simultaneously; Require the automobile instrument single-chip microcomputer, " submeter sampled value (DXi) " after the conditioning of instrumentation tap circuit spread out of;
The automobile instrument single-chip microcomputer collects " submeter sampled value (DXi) ", and after receiving the mentioned order that diagnostor sends, the automobile instrument serial communication interface spreads out of " submeter sampled value (DXi) ";
After diagnostor received " submeter sampled value (DXi) ", original " submeter standard value (MXi) " corresponding with " submeter physical quantity (Xi) " compared, calculate error=| DXi-MXi|}.If error is assert this submeter signal interface circuit operation irregularity greater than " submeter error threshold (DMXi) ", the diagnostor alarm, the record diagnosis result is " this submeter fault "; Otherwise diagnostic result is normal.
B, the diagnosis of automobile instrument submeter indicating section:
Diagnostor is accomplished this submeter; After certain scale signal interface circuit diagnosis, the scale position that LCD prompting " submeter physical quantity (Xi) " pointer should belong to is through observing this submeter list index physical location; According to relevant national standard QC/T727-2007; Can judge whether this submeter motor and drive circuit works be normal, if pointer indication deviation exceeds standard; This scale position of this submeter " certain submeter indication fault " is noted in the LCD prompting of use diagnostor and push-button combination operated; Otherwise, assert that this submeter indication is normal, press " confirming key ", get back to A-a and get into next scale submeter physical quantity (Xi+1) diagnosis.
C, automobile instrument submeter diagnostic result:
Accomplish the diagnosis of these all scales of submeter, subsequently this submeter is done whole judgement, if any calibration points does not all have fault, diagnostic result is " this submeter is normal ", otherwise is " this submeter fault ".Diagnostor is transferred to diagnostic result the automobile instrument storage through communication port and keeps.
4, the speed of a motor vehicle, signals of rotational speed sensor diagnosis: after accomplishing the diagnosis of the sensor signal, get into the speed of a motor vehicle, signals of rotational speed sensor diagnostic state.
A, the diagnosis of vehicle speed sensor signal:
The diagnostor serial communication interface sends vehicle speed sensor signal diagnosis " beginning " order and gives automobile instrument, requires the automobile instrument single-chip microcomputer to prepare to accept the vehicle speed pulse signal, and subsequently, diagnostor becomes " vehicle speed pulse output " state by " serial communication " state exchange.
Diagnostor is through the corresponding pulsed frequency (AV1) of (Vout) speed of a motor vehicle of output (V1), and after lasting 2 seconds, stop pulse is exported.Diagnostor becomes " serial communication " state by " vehicle speed pulse output " state exchange again, waits for the vehicle speed pulse frequency sampling value (DV1) of accepting automobile instrument.
The automobile instrument single-chip microcomputer collects diagnostor through (Vin) and sends the vehicle speed pulse frequency, continues to confirm after 2 seconds, obtains vehicle speed pulse frequency sampling value (DV1).Behind the vehicle speed pulse blackout (diagnostor gets into " serial communication " state and waits for that frequency is 0 down), automobile instrument becomes " serial communication " state by " vehicle speed pulse input " state exchange, and the vehicle speed pulse frequency sampling value (DV1) of gathering is spread out of.
Subsequently, automobile instrument becomes " vehicle speed pulse input " state by " serial communication " state exchange.The speedometer pointer maintains the speed of a motor vehicle (V1) position, exports the corresponding pulsed frequency (AV2) of the next speed of a motor vehicle (V2) until diagnostor.
After diagnostor received vehicle speed pulse frequency sampling value (DV1), the original vehicle speed pulse frequency standard value (MV1) corresponding with the speed of a motor vehicle (V1) compared, calculate error=| DV1-MV1|}.If error assert that greater than " speed of a motor vehicle error threshold (DMV1) " this speed signalling interface circuit working is unusual, the diagnostor alarm, the record diagnosis result is " speed of a motor vehicle fault "; Otherwise diagnostic result is normal.
After diagnostor was accomplished the GES circuit diagnostics, the position that prompting speedometer pointer should belong to was through observing automobile speed in automobile instrument indicator gage finger position; According to relevant national standard QC/T727-2007; Can judge whether the work of instrument speed of a motor vehicle indication motor is normal, if pointer indication deviation exceeds standard; This scale position of speed of a motor vehicle indicating gauge " speed of a motor vehicle indication fault " is noted in the LCD prompting of use diagnostor and push-button combination operated.
Diagnostor is exported the corresponding pulsed frequency (AVi) of the speed of a motor vehicle (Vi) in proper order, diagnoses, and accomplishes the diagnosis of whole automotive speedometer scale; Write down the fault of each calibration points; Subsequently automotive speedometer is done whole judgement, if any calibration points does not have fault; Diagnostic result is " speedometer is normal ", otherwise is " speedometer fault ".Diagnostor is transferred to diagnostic result the automobile instrument storage through communication port and keeps.
B, signals of rotational speed sensor diagnosis: diagnostic procedure is similar with the diagnosis of vehicle speed sensor signal, and the key distinction is:
The tacho-pulse frequency delivery outlet of diagnostor is (Sout); The tacho-pulse frequency input port of automobile instrument is (Sin).
The rotating speed diagnostic data is: tacho-pulse frequency (ASi), tacho-pulse frequency sampling value (DSi), tacho-pulse frequency standard value (MSi), speed error threshold value (DMSi) that rotating speed (Si) is corresponding.
The record diagnosis result be " rotating speed fault ", " rotating speed indication fault ", or for diagnostic result for normally.Diagnostor is transferred to diagnostic result the automobile instrument storage through communication port and keeps.
More than being the embodiment that combines accompanying drawing given, only is the preferred version of realizing the object of the invention.For one of ordinary skill in the art, can take a hint in view of the above, and direct derivation goes out to meet other replacement of design concept of the present invention, also should belong to rights protection scope of the present invention.
Claims (9)
1. a diagnosis type automobile combination meter includes following modular structure,
The instrument single-chip microcomputer has the signal input, display prot, drive output port and the storer that connect the instrumentation tap circuit;
The instrumentation tap circuit has digital signal sensors interface circuit, analog signal sensors interface circuit and switching value signal interface circuit;
The instrument output circuit has the liquid crystal display drive circuit of motor-drive circuit, connection mileage LCD, the on-off circuit of connection alarm lamp group, it is characterized in that:
In the instrumentation tap circuit, be provided with a serial communication passage,
In the instrument single-chip microcomputer, be provided with serial data port SDA1, SDL1 and control port SDC1, ACT1,
A two-way four-way analog switch COMS chip connects a pair of digit pulse input channel in control serial communication passage, the digital signal sensors interface circuit respectively,
And dispose socket 1A, in socket 1A, a pair of jack Z1AV, Z1AS connect vehicle speed pulse input channel Vin, tacho-pulse input channel Sin respectively, or connect serial data port SDA1, SDL1.
2. diagnosis type automobile combination meter according to claim 1 is characterized in that: described serial communication passage and a pair of digit pulse input channel are shared a pair of wire harness XV, XS.
3. diagnosis type automobile combination meter according to claim 1 and 2; It is characterized in that: two-way four-way analog switch COMS chip connects a pair of digit pulse input channel of control, is respectively vehicle speed pulse input channel Vin and tacho-pulse input channel Sin.
4. automobile instrument diagnostor is characterized in that: include following modular structure,
The diagnostor single-chip microcomputer, have the signal output that connects signal output apparatus, controlling and driving display display prot, be used for carrying out RS232 serial communication interface, the storer of communication with the diagnostic message management system terminal;
Signal output apparatus has digital signal output circuit, simulating signal output circuit, switching value signal output apparatus and automobile instrument analog power output control circuit;
The serial communication passage is arranged in the digital signal output circuit;
A two-way four-way analog switch COMS chip connects a pair of digit pulse output channel in control communication channel, the digital signal output circuit respectively;
Wire harness, wire harness comprise 2 plugs and connect automotive diagnostic unit and diagnosis type automobile combination meter as claimed in claim 1 respectively;
And, the automobile instrument analog power.
5. automobile instrument diagnostor according to claim 4 is characterized in that: respectively comprises 2 jacks in the wire harness both sides plug of connection automotive diagnostic unit and diagnosis type automobile combination meter, and connects a pair of wire harness XV, XS,
Described serial communication passage and a pair of digit pulse output channel are shared a pair of wire harness XV, XS.
6. according to claim 4 or 5 described automobile instrument diagnostors, it is characterized in that: a pair of digit pulse output channel that two-way four-way analog switch COMS chip controls connects is respectively vehicle speed pulse output channel and tacho-pulse output channel.
7. automobile instrument diagnostic method is characterized in that: adopts the wire harness that is complementary, connects diagnosis type automobile combination meter as claimed in claim 1 and automobile instrument diagnostor as claimed in claim 4,
To diagnosis type automobile combination meter analog power is provided by the automobile instrument diagnostor,
Send digital signal, simulating signal and switching value signal under the simulated automotive transport condition through the automobile instrument diagnostor to diagnosis type automobile combination meter,
According to combination instrument measured data and the signal that the serial communication passage feeds back to, diagnose and fault verification to combination instrument, sensor or wire harness articulation issues.
8. automobile instrument diagnostic method according to claim 7; It is characterized in that: to the diagnosis of combination instrument; Include automobile instrument energising detection, the diagnosis of switching value signal path, sensor signal interface circuit diagnostics, and the diagnosis of automobile instrument indicating section.
9. automobile instrument diagnostic method according to claim 8 is characterized in that: the diagnostic message to diagnosis type automobile combination meter is stored in the storer of instrument single-chip microcomputer.
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| CN2009103042310A CN101949713B (en) | 2009-07-10 | 2009-07-10 | Diagnostic automobile combined instrument, instrument diagnostor and instrument diagnosing method |
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| CN2009103042310A CN101949713B (en) | 2009-07-10 | 2009-07-10 | Diagnostic automobile combined instrument, instrument diagnostor and instrument diagnosing method |
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| CN101949713B true CN101949713B (en) | 2012-05-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103057419B (en) * | 2011-10-19 | 2015-06-17 | 吉林省启明电子科技股份有限公司 | Input voltage automatic adjustment control device capable of being turned off of digitized automobile combination meter |
| CN103676659B (en) * | 2012-09-07 | 2017-12-01 | 博世汽车服务技术(苏州)有限公司 | It is a kind of to have the diagnostic equipment intelligently recorded and its recording method |
| US10482687B2 (en) * | 2017-04-11 | 2019-11-19 | Ford Global Technologies, Llc | Diagnosis of an acoustic vehicle alerting system (AVAS) based on existing sensors |
| CN107748510B (en) * | 2017-09-25 | 2019-12-10 | 北京新能源汽车股份有限公司 | Vehicle fault diagnosis method and device and automobile |
| CN108490909B (en) * | 2018-02-28 | 2020-06-19 | 北京航天发射技术研究所 | Online automatic detection method for special vehicle control system hardware access |
| CN110162010A (en) * | 2019-05-16 | 2019-08-23 | 上海星融汽车科技有限公司 | Vehicular meter diagnostic method |
| CN110361043B (en) * | 2019-07-25 | 2021-11-19 | 武汉蓝星科技股份有限公司 | Vehicle-mounted instrument fault detection system and fault detection method thereof |
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Address after: Qingdao City, Shandong province 266021 Changchun Road No. 2 Building 16 2 unit 601 Patentee after: QINGDAO DONGTIAN AUTOMOTIVE ELECTRONICS TECHNOLOGY CO., LTD. Address before: 266034 No. 9-10, Hangzhou Road, Sifang District, Shandong, Qingdao Patentee before: Qingdao Dongtian Automotive Electronics Technology Co., Ltd. |
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