CN101221442A - Distributed diagnostics architecture - Google Patents

Abstract

A distributed on-board diagnostic (OBD) architecture for a control system of a vehicle includes a plurality of control modules that are in communication with one another and a designated master OBD control module that is one of the plurality of control modules. The master OBD control module performs functions that a remainder of the plurality of control modules are incapable of performing including at least one of arbitrating a malfunction indicator lamp (MIL) state, arbitrating and storing OBD freeze frame data and determining OBD status flags of the remainder of the plurality of control modules.

Description

Distributed diagnostics architecture

The cross reference of related application

[0001] the application requires in the right of priority of the U.S. Provisional Application NO.60/763483 of submission on January 30th, 2006.

Technical field

[0002] the application relates to vehicle, particularly has the distributed diagnostics architecture that is used for vehicle of a plurality of control modules.

Background technology

[0003] traditionally, vehicle comprises a plurality of systems that are used to regulate the whole operations of vehicle.For example, vehicle has the propulsion system (for example, internal combustion engine and/or motor) that produce driving torque, and the energy storing device (for example, electric battery) of electric energy is provided, and distributes the variator of driving torque to driving wheel and multiple other system.Each system all comprises control corresponding module or communication module, and this communication module and other module are carried out communication to regulate the running of vehicle.

[0004] present vehicle comprises a vehicle-mounted fault diagnosis (OBD) system, is used to the engine control that provides nearly all, and the system of vehicle is monitored, and the fault diagnosis Control Network of vehicle.The proper operation of each control module of OBD systems inspection Vehicular system and sensor (for example, front-end and back-end catalyst oxygen sensor) and other assemblies.If any one assembly breaks down, then light malfunction indicator lamp (MIL), and diagnostic trouble code (DTC) (DTC) is set.Vehicle technician or car owner read DTC by a general maintenance tool being linked the OBD socket on the vehicle, just can promptly determine the source of trouble.

[0005] along with the appearance of more complicated Vehicular system, hybrid-electric car for example, inline control module number has increased.Consequently, the coordination of the individual control module that need diagnose of OBD has increased.Correspondingly, the OBD system is applicable to the unique system of concrete vehicle, all needs spended time, energy and cost on each vehicle platform.Current, also there be not a kind of general can adapting to easily to have the OBD system of various different system configuration vehicles.

Summary of the invention

[0006] therefore, the present invention provides a kind of distributed vehicle mounted failure to examine numerical information for the control system of vehicle.

[0014] also have in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment of one of described a plurality of control modules.A described OBD control module offers described main OBD control module signal, this signal comprise with the relevant DTC signal of discharging and the fault activation signal of being correlated with discharging at least one of them.

[0015] however in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment in described a plurality of control module and second control module of appointment, and described second control module provides relevant monitor message based on ratio to arrive one of described main OBD control module and described OBD control module.Described distributed OBD system further comprises subordinate the 2nd OBD control module of described a plurality of control modules of appointment, it is according to the indication of one of described main OBD control module or the 2nd OBD control module, at least carry out to remove failure diagnosis information, and calibration identification and the calibration verification numerical information host computer control module to associated is provided.

Description of drawings

[0016] detailed description with reference to the accompanying drawings and the accompanying drawing of enclosing, the present invention can fully be understood, wherein:

[0017] accompanying drawing 1 is the functional-block diagram according to an exemplary Vehicular system of the present invention, comprising distributed diagnostics architecture.

[0018] accompanying drawing 2 is functional-block diagrams of distributed diagnostics architecture of the present invention, comprising a plurality of exemplary control modules.

Embodiment

[0019] description to most preferred embodiment below is exemplary in essence, the present invention and its application or use is not limited.For the sake of clarity, similar in the accompanying drawings part is represented with same Reference numeral.Here, term " module " refers to a special IC (ASIC), and electronic circuit, processor are (shared, special-purpose, perhaps group) and storer, to carry out one or more softwares or firmware program, combinational logic circuit, and/or other assembly that is fit to, the function that provides a description.Here, term " standard vehicle-mounted fault diagnosis (OBD) drive cycle " refers to a drive cycle, i.e. the time period that all systems of vehicle are diagnosed.

[0020] comprises engine 12 and motor 14 referring now to 1, one exemplary motor vehicle driven by mixed power 10 of accompanying drawing, with drive speed transmission 16.Especially, motor 14 replenishes engine 12 to produce the driving torque of drive speed transmission 16.Under this sample loading mode, increased burning efficiency, reduced discharging.Disconnected (OBD) system.Described distributed OBD system comprises the main OBD control module of the appointment of one of a plurality of control modules of communicating with one another each other and described a plurality of control modules.Described main OBD control module is carried out the inexecutable function of other described a plurality of control modules, comprise one of following at least function of execution: ruling malfunction indicator lamp state, ruling and the storage OBD data of freezing frame, and the OBD status indication of determining other a plurality of control modules.

[0007] on the one hand, each control module is carried out OBD algorithm, with monitor with input, output or the system of specific control module associated whether one of them working properly at least.

[0008] others, each control module is carried out self diagnosis.Described self diagnosis comprise diagnosis with lower device at least one of them: ROM, RAM or other memory storage, and detect all other peripheral units relevant be positioned within the described specific control module with discharging.

[0009] in addition on the one hand, if it is associated one of control module therewith, each control module increases the diagnostic monitoring based on ratio.

[0010] in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment of one of described a plurality of control modules.An each described main OBD control module and a described OBD control module are stored at least one diagnostic trouble code (DTC) (DTC), and store their DTCs, this diagnostic trouble code (DTC) (DTC) corresponds to one of other a plurality of control modules, one of this control module and main OBD control module and OBD control module associated.

[0011] in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment of one of described a plurality of control modules.An each described main OBD control module and a described OBD control module are stored at least one monitoring value based on ratio, and store their monitoring value, should correspond to one of other a plurality of control modules with one of a main OBD control module or OBD control module associated based on the monitoring value of ratio based on ratio.

[0012] in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment of one of described a plurality of control modules.An each described main OBD control module and a described OBD control module can be led to the OBD signal by lock between first communication bus and second communication bus.

[0013] in addition on the one hand, described distributed OBD system further comprises an OBD control module of the appointment of one of described a plurality of control modules.Each described main OBD control module and described OBD control module storage and report the calibration identification of one of other a plurality of control modules of an at least one and described main OBD control module or a described OBD control module associated and calibration verification engine 12 and motor 14 couple together by belt-alternator-starter (BAS) system 18.Especially, motor 14 is used as a starter (for example, motor) and alternator (for example, generator), and is connected on the engine 12 by belt and belt pulley system.Engine 12 and motor 14 comprise belt pulley 20,22, are rotationally connected by belt 24 respectively.Belt pulley 20 is rotationally connected with the bent axle 26 of engine 12.

[0021] in one mode, engine 12 drive motor 14 produce power, and energy accumulating device (ESD) 28 is charged.Under another kind of pattern, the energy of motor 14 usefulness ESD 28 drives engine 12.ESD28 can include but not limited to battery and/or super capacitor.As selection, BAS system 18 can be substituted by flywheel-alternator-starter (FAS) system (not shown), this system comprises the motor that places between engine and variator, chain, the gear train, and chain, gear train are arranged between motor 14 and the bent axle 26.

[0022] although described variator describes with buncher (CVT), yet variator 16 can include but not limited to CVT, manual transmission, automatic transmission and auto-manual transmission (AMT).Driving torque is delivered to variator 16 by coupling device 30 from engine crankshaft 26.Coupling device 30 can include but not limited to power clutch or torque converter according to the type of variator.Under the situation of using CVT, coupling device 30 is the torque converters that comprise torque transfer clutch coupling (TCC) 31.Variator 16 amplifies torque by one of a plurality of gear ratios, to drive driving shaft 32.

[0023] control system 34 is regulated the operation of vehicle 10, and the diagnostics architecture of describing according to the present invention is configured.Especially, control system 34 comprises a plurality of control modules, and the various piece with vehicle 10 links to each other respectively, and communicates by at least one controller zone network (CAN) bus, and this will be elaborated hereinafter.Control system 34 comprises at least 4 control module vehicle-mounted fault diagnosis (OBD) mark, comprising: main OBD control module, first order OBD control module, second level OBD control module and attached second level OBD control module.Especially, control system 34 comprises main OBD control module, zero or more a plurality of first order OBD control modules, zero or more a plurality of second level OBD control module and zero or a plurality of attached second level OBD control module.The responsibility of each OBD control module and/or requirement will further describe in detail hereinafter.Usually, control system 34 monitors parts and systems, storage diagnostic trouble code (DTC) (DTC) is qualified/and failure (PASS/FAIL) decision, keep usage rate, ruling malfunction indicator lamp (ML), and respond general scanning tools diagnostic test mode serial data requirement.

[0024] referring now to accompanying drawing 2, exemplary control system 34 comprises main OBD control module 40, first, the second and the 3rd first order OBD control module 42,44,46, first, second second level OBD control module 48,50, first, the second subordinate second level OBD control module 52,54 and first to fourth universal control module 56,58,60,62, although universal control module 56,58,60,62 communicate with other control modules, to regulate their systems separately of operation, but described universal control module 56,58,60,62 right and wrong OBD control modules do not need for distributed OBD system proper handling.

[0025] in an exemplary embodiment, main OBD control module 40 is engine control module (ECM)s, and it regulates all operations of engine 12.First, second and the 3rd first order OBD control module 42,44,46 comprise transmission control module (TMC), fuel system control module (FSCM) and hybrid power processor controls (HCP).First, second second level OBD control module 48,50 comprises electric battery control module (BPCM) and electronic brake control module (EBCM).First, second subordinate second level OBD control module 52,54 comprise motor processor controls A and B (MCPA, MCPB).Tractive force counter-rotating module (TPIM) comprises described HCP, MCPA and MCPB.First to fourth universal control module 56,58,60,62 can include but not limited to respectively: BCM Body Control Module (BCM), wheel box control module (TCCM), electrical power steering device (EPS) control module and communication port module (CGM).Each module communicates by the first and second CAN buses 64,66.Thereby control module is those control modules that normally are associated with a particular system, but also comprises the OBD function based on distributed diagnostics architecture of the present invention.

[0026] responsibility of each OBD control module of control system 34 and/or requirement include but not limited to hereinafter described, are represented by the mark A-Q that provides respectively:

A-diagnoses relevant assembly and system

The DTCs of B-storage oneself

C-ruling malfunction indicator lamp (MIL) state

D-provides fault status information to arrive continuous host computer control module

The E-storage comes from the DTC information of the continuous second level and/or subordinate second level control module

F-increases molecule and denominator for the monitor based on ratio that links to each other

G-is all monitor storage molecule and denominators based on ratio of report

H-provides the monitor status based on ratio to arrive the host computer control module that links to each other

OBD is desired freezes frame for I-ruling and storage

J-measures and provides the control module of OBD status indication to other

K-with warm-up cycle standard state, cold start-up situation and the diagnostic message lock road that empties to subordinate second level control module.

L-only removes failure diagnosis information according to the order of the first order control module of advocating peace

M-is that universal scan device malfunction diagnostic test mode provides support

N-provides the numerical information of calibration identification and calibration verification to related host computer control module

O-is related subordinate second level control module storage and the numerical information of reporting calibration identification and calibration verification

P-provides following signal for the main control module:

The DTC relevant with discharging; With

The fault actions relevant with discharging

Q-comprise nonvolatile memory (NVM) in order to the storage failure state with based on the information of ratio monitor status, report in next ignition cycle

Below form responsibility/requirements of above addressing is illustrated, itself and interrelate based on the control module of the described mark that interrelates.

Control module	Responsibility/requirement
		Main	A-C, E-G, I-K, M and O
The first order	A, B, E-G, K, M, O and P
		The second level	A, D, F, H, M and Q
The attached second level	A, D, F, H, L, N and Q

Table 1

Each described responsibility and requirement will be described in detail now.

[0027] responsibility/require A:

Each control module comprises the fault diagnosis monitor, and each fault diagnosis monitor all is the vehicle-mounted fault diagnosis test, with the normal condition of monitoring input, output and/or system.When the parameter of this diagnosis algorithm definition is considered to make mistakes in input, output and/or system, perhaps when input, output and/or system are considered to working properly, all can calibrate.The necessary autodiagnosis of each control module, it includes but not limited to check ROM, RAM and other main storage arrangements.These autodiagnosis also are included in the inspection of other all peripherals relevant with discharging in the control module, if determine not have other OBD that need monitor will detect this type of fault in these control modules.In addition, each control module must be diagnosed all input and output that can have influence on discharging or be used as the diagnosis policy part for other any diagnostic monitoring during any reasonable use driving condition.A control module also can be set diagnose main system and signal (for example, catalyzer monitor).

[0028] responsibility/require B:

The control module of storing himself DTCs comprise by the standard diagnostics link store described DTCs with canonical form and report to scanning tools necessary algorithm.This just requires resident diagnostic data management software, is responsible for the qualified and failure reporting of each DM of record.

[0029] responsibility/require C:

Self have an activation when main OBD control module with the relevant DTC of discharging maybe when main OBD control module from first order OBD control module receive have a true value when discharging the fault activation signal of being correlated with, described main OBD control module instructs described MIL to open.The described fault activation signal relevant with discharging includes but not limited to: hybrid power system discharging dependent failure activation signal, variator discharging dependent failure activation signal and a fuel system discharging dependent failure activation signal.

[0030] MIL requires the priority of having relatively high expectations in all OBD orders.Some examples of high priority MIL order include but not limited to: owing to catch fire when causing catalyst breakage, the misfire fault diagnosis requires the frequency scintillation MIL with 1Hz, and ECM requires MIL to light, and/or petrolift initial logic request MIL is glittering.When described main OBD control module receives with discharging relevant fault activation signal value is fictitious time, and MIL is ordered OFF, unless MIL is ordered ON or itself because other reason is glittering.Main OBD control module sends the indicating fault request relevant with engine emission according to the MIL state of the current command.

[0031] describedly do not influence with the situation of the relevant fault activation signal state of discharging (for example, true or false) to main OBD control module MIL state.OBD control module state is the function that is stored in the DTCs in the main OBD control module, and the fault activation signal that fault DTC that produces with first order OBD control module or first order OBD control module are relevant with discharging has nothing to do.When the relevant DTC of engine emission was activity, main OBD control module sent engine emission dependent failure activation signal as indication.

[0032] responsibility/require D:

The second level sends the diagnostic state signal to the first order that links to each other with it or main OBD control module with subordinate second level OBD control module according to signal description.These signals include but not limited to storage failure diagnostic state (for example, RAM, ROM etc.).

[0033] responsibility/require E:

The first order of advocating peace OBD control module is the second level and subordinate second level OBD control module storage DTC information.Described DTC information is stored according to described signal description diagnostic state.The DTC report information that receives is given the diagnostic data manager, and it is used for storing independent igniting or independent battery NVM.

[0034] responsibility/require F:

Each undertakes to judge when increase its molecule and denominator independently based on ratio fault diagnosis monitor.The signal that each monitor is used for influencing the decision that increases molecule and denominator includes but not limited to: legal diagnosis cold start fault occurs, legal diagnosis cold start meets, legal diagnostic criteria state is reset, and legal diagnostic criteria status fault occurs and legal diagnostic criteria state meets.

[0035] responsibility/require G:

The first order of advocating peace OBD control module is that the second level and attached second level OBD control module are stored based on the ratio monitor information.Molecule and denominator basis based on the ratio monitor are upgraded the signal description based on the ratio monitor status.

[0036] responsibility/require H:

Each has based on the second level of ratio monitor and attached second level OBD control module and transmits based on the ratio monitor status according to signal description, below can introduce in detail.

[0037] responsibility/require I:

Main OBD control module receives and the input of the fault activation signal that discharges relevant DTC and be correlated with discharging as general fault DTC.General fault DTCs includes but not limited to: the MIL that transmission control module (TCM) requires is luminous, and the MIL that hybrid power processor controls (HCP) requires MIL luminous and that fuel system control module (FSCM) requires is luminous.When main OBD control module decision is used and is discharged relevant DTC and the fault activation signal relevant with discharging, gives specific general DTC report failure and/or qualified.

[0038] standard of general fault DTC monitor is only based on value of discharging relevant DTC and discharging dependent failure activation signal.Fail criteria is the true value that detects non-zero DTC and the activation of discharging dependent failure in the relevant DTC of discharging.If described code is not removed, general fault DTC failure is reported once in an ignition cycle.If described code is not removed, general fault DTC is qualified to be reported once in an ignition cycle.No matter whether general fault DTC lost efficacy and be stored and discharge the value that discharging that relevant DTC or fault activate changes and change, the relevant DTC of discharging is exactly a non-zero like this, and it is true discharging the dependent failure activation.The relevant DTC of tube drainage be not that zero-sum discharging dependent failure activates is failure, all report one qualified.

[0039] when situation during by precise marking, main OBD control module is used and is discharged relevant DTC signal and determine to be stored in actual DTC value in freezing frame.The situation that identifies and freeze frame (that is, as DTC when being movable, the image of corresponding data state) in main OBD control module includes but not limited to: described freezing frame is empty to be stored as definite code with general fault DTC.General fault DTC in main OBD control module is calibrated to A type fault diagnosis, does not need bright lamp, so MIL is not ordered ON by described general fault DTC indirectly.

[0040] responsibility/require J:

Main OBD control module is responsible for providing following signal according to described signal description:

-engine thermal starts finishes signal, and after specific several warm start circulation, it is used for removing DTC historical information in the OBD storer by first order OBD control module;

Signal appears in-fault diagnosis cold start fault, and it is to restrain for the replaceable indication of monitor increase based on the molecule of ratio, can only work as when vehicle lives through a cold start-up and just carry out;

-fault diagnosis cold start respective signal, it is to increase to the replaceable indication of monitor increase based on the denominator of ratio, has only when vehicle lives through a cold start-up and could carry out;

Signal appears in-fault diagnosis standard state fault, it is to restrain the indication that increases based on the molecule of ratio, because standard state can not reach (this signal is not to follow the monitor based on ratio to be employed, and has only when vehicle lives through a cold start-up and could carry out) owing to the fault of OBD system;

-fault diagnosis standard state corresponding signal, initial increase is based on the indication (this signal is not to follow the monitor based on ratio to be employed, and has only when vehicle lives through a cold start-up and could carry out) of the denominator of ratio;

-fault diagnosis standard state reset signal, OBD of its expression drives circulation to begin; With

-remove the failure diagnosis information signal, if necessary, it is used for the described signal of passage to subordinate second level OBD control module by first order OBD control module.

[0041] signal of pointing out above will further describe in detail hereinafter, will be used for keeping the molecule and the denominator of usage rate, the monitor that is based on ratio that refers generally to by all OBD control modules.Will point out that also standard OBD drives the circulation beginning, previous circulating in running/crank hardware transformation from low to high finished.When not having the running/crank hardware as input in control system, it is that standard OBD drives round-robin and begins that described fault diagnosis standard state reset signal (for example, transformation from low to high) is used in reference to.

[0042] responsibility/require K:

Control module may be required the logical OBD system signal of lock from main OBD bus to different communication buss.Driving the desired condition in lock road is application-specific, can comprise serial data structure, OBD factor, demand for development and other similar factor.When control module is required that lock leads to the OBD system signal, control module is transmitted the value that receives at last in a plurality of positioning indicators, include but not limited to: engine thermal starts circulation and finishes, legal fault diagnosis cold start fault presents, legal fault diagnosis cold start reaches, legal fault diagnosis standard state fault presents, and legal fault diagnosis standard state reaches and removes legal failure diagnosis information.These positioning indicators from main OBD bus transfer to the communication bus that requires.When the data that do not receive main OBD bus, defined fail soft data just are transferred on the channel bus.Any communication linkage (these signals carry out lock by described communication linkage and lead to) must be diagnosed as legal fault diagnosis element by carrying out the logical control module (for example, described master or first order control module) of lock.

[0043] responsibility/require L:

Subordinate second level OBD control module can not directly be supported removing/replacement discharging relevant diagnostic information pattern (that is, Mo Shi $04), but can be based on removing all failure messages of legal diagnostic message signal removal.Optionally, if described subordinate second level OBD control module does not have on main OBD bus and/or other separate procedure needs, separate procedure can be transmitted the legal diagnostic message signal of described removing.This includes but not limited to: all fault diagnosis counters and the malfunction in its storer.This signal is not to influencing based on ratio monitor molecule and denominator.

[0044] responsibility/require M:

As following form limited, each master, the first order and second level OBD control module all required universal scan instrument diagnostic test mode is responded.Subordinate second level OBD control module is not directly to described scanning tools response.If, and if have only, any control module in the Be Controlled system 34 is applied to control or diagnoses described emission control systems, and then parameter recognition code (PIDs) must be supported.

Pattern	Explanation	Main	The first order	The second level	The attached second level
						$01	Require current dynamical system diagnostic data	Be	Be	Be
$02	Require the dynamical system data of freezing frame	Be
						$03	Require all dynamical system failure codes relevant with discharging	Be	Be
$04	All diagnostic messages relevant of removing/replacement with discharging	Be	Be	Be
						$05	Require O2 sensor test ID to support (not supporting)
$06	Require the vehicle-mounted monitor test result of test I D	Be	Be
						$07	Require all dynamical system service verification sign indicating numbers relevant with discharging	Be	Be
$08	Require the control of onboard system, test, or unit test ID supports (not supporting)
						$08	Require the control of onboard system, test, or parts (not supporting)
$09	The information of vehicles type ($01 that Xin Xileixing $00-supports is to $20)	Be	Be	Be

Table 2

[0045] responsibility/require N:

Subordinate second level OBD control module must send calibration identification and calibration verification numerical information arrives coupled host computer control module, and like this, host computer control module can reach the requirement of fault diagnosis.The all software and the calibration data that are stored in the OBD control module of the subordinate second level are covered by one or more calibration discriminating digits (CIDs) and calibration verification numeral (CVNs).Each CID represents the zone of ROM, can cover the ROM of all or part control module, but can overlappingly not be included in the fragment of the ROM of other CIDs.There is the CIDs of sufficient amount to comprise all ROM.A subordinate second level OBD control module has the CIDs (for example, 16) of the number of thresholds of being no more than.The preferred 16 bit ASCII strings of described CIDs, wherein whole 16 bit ASCII strings are stored among the ROM with the form of one 16 bit ASCII string value.

[0046] CID supports each software control module part numeral and calibration control module part numeral.The value of CIDs equates with the software of ASCII fromat or calibration module part numeral.CIDs is stored in the control module, separates with manufacturing tracking section digital block.Untapped CID character storage and Bao Gaowei $00.Especially, CID is that a left side is adjusted and quilt is mended $00.

[0047] each CID comprises corresponding C VN, the looking into and calculating of the zone of the storer that expression is confirmed CID.Described CVN uses industrial standard CRC-16 method, and it is carried out polynomial expression x^16+x^15+x^2+1 16 results are provided.Byte 1 is the most significant byte of CVN, if used less than 4 bytes, described CVN is aimed at by the right side and Bu $00.This is indicating that byte 1 and byte 2 are by benefit $00.Be not programmed among all ROM or untapped part is looked into and the part in zone, do not need to be included in CVN calculates.If ignition cycle is greater than threshold time (for example, 2 minutes), described CVN calculates in each ignition cycle and calculates once.Because calibration/software that CIDs represents is not reproducible programming, corresponding C VN is set to zero or can is result calculated if desired.

[0048] OBD control module in the subordinate second level is transmitted its CIDs and CVNs to its console controller with its calibration identifying information signal.

[0049] responsibility/require O:

The host computer control module that links to each other with subordinate second level OBD control module is stored and is reported described CID and CVN information to its subordinate second level OBD control module, and it reaches information of vehicles request (that is Mo Shi $09) fault diagnosis requirement like this.Host computer control module is accepted the calibration identifying information signal from its subordinate second level OBD control module, and provides each igniting independence or battery independently to remember (for example, 20 bytes) for the storage of each CID that receives and CVN.In order to distinguish between untapped calibration discrimination index, the part numeral that does not receive, the CVNs that does not calculate or part numeral that has received and stored and CVNs, described host computer control module also provides the storer of same type for the storage of each CID and CVN state.

[0050] described master machine control unit is stored the CVNs of CIDs that receives at last and the calculating of getting in touch with it, the state of each the calibration discrimination index that receives in addition.If receive a new CID, its data mode shows that CVN does not calculate, just with its storage be labeled as and have the CID that does not calculate CVN, up to receiving the CVN that has calculated.When information of vehicles request response was provided, described data were reported with information of vehicles request (for example, the Mo Shi $09) data of host computer control module oneself.The calibration discrimination index that does not have to use is not included in the information of vehicles request msg of report.

[0051] responsibility/require P:

All first order OBD control module transmits the DTC relevant with discharging and the fault activation signal of being correlated with discharging arrives described main OBD control module, in order correctly to light described MIL and the record data of freezing frame.

[0052] responsibility/require Q:

The responsibility of the described second level and subordinate second level OBD control module can or can not comprise for the igniting independence of other purpose or battery independence NVM.In some cases, the qualified/failure decision of report DTCs or the molecule/denominator that increases based on ratio determine, are only just making after common series data communication is ended after the shutdown.In these cases, the second level of response or subordinate second level OBD control module request NVM storage DTC fault and/or based on the ratio monitor status information, and at next ignition cycle report (referring to responsibility/require D and H).

[0053] the various OBD signals of distributed diagnostics architecture execution of the present invention will here be introduced in detail.Main OBD control module determines when that according to a crank/running time-delay (that is engine start) transformation from high to low beginning standard OBD drives circulation.When main OBD control module drives the circulation beginning at each standard OBD of threshold time (for example, 1 second), set described diagnostic criteria state and reset (DSCR) signal to true.This mode, standard OBD drives round-robin and begins just synchronous between different distributed OBD control modules.When described threshold time expired, described DSCR signal was converted to vacation, and described main OBD control module is prepared to receive from the next monitor information based on ratio of other distributed OBD control module.When described DSR signal is a true time, main OBD control module is ignored any information.

[0054] for the monitor status based on ratio of a specific control module and/or system, keeps the ratio of forming by molecule and denominator in use.Described ratio keeps by the molecule and the denominator of a specific ratios of asynchronous increase.Described molecule monitors when finishing at OBD to be increased, and described denominator increases according to the standard driving condition, has defined an effective trip like this.

[0055] the described second level and the subordinate second level corresponding module of OBD control module transmission and/or system arrives described master and/or first order OBD control module based on ratio monitor status (RBMS) packetized signals.Described RBMS packetized signals by circulation regularly through each based on ratio monitor and described RBMS packetized signals afterwards that each is continuous, reported that all operate in the state based on the ratio monitor on the specific second level and the subordinate second level OBD control module.For example, if this specific second level and subordinate second level OBD control module are only in fact supported the subclass based on a maximum number of ratio monitor, so, the packetized signals of the monitor that all are not supported spreads out of with the state of indication NO ACTION.After having transmitted last RBMS packetized signals, finish this process by sending a frame based on the ratio monitor for first.The primary and foremost purpose of RBMS packetized signals is to allow to have keeping based on ratio molecule and distribution of described master and/or first order OBD control module, and does not require that the described second level and subordinate second level OBD control module burden are based on ratio foundation structure software and NVM.

[0056] state that interrelates based on ratio monitor exponential sum of described report increases with the cycle transfer ratio or upgrades, but increases and renewal is no faster than described cycle transfer ratio, so not based on ratio monitoring value and the loss of state that interrelates.If the continuous RBMS packetized signals that receives by main and/or first order OBD control module be equate (for example, identical based on ratio monitor exponential sum state with last received signal), then described master and/or first order OBD control module are ignored second and any later continuous equivalent message.This general mechanism makes General Purpose Interface mechanism can keep stable, even the second level and the diagnosis of subordinate second level OBD control module require to change.

[0057] as mentioned above, described RBMS packetized signals comprises based on ratio monitor index (RBMI) with based on ratio monitored state (RBMS).Described RBMI is used as the index of support based on the form of ratio supervision and indication particular watcher, and the state of described particular watcher is indicated by RBMS.Described RBMS comprises that based on ratio molecule and denominator be that described monitor increases decision, carries out the monitor indication by RBMI.

[0058] drive round-robin at each standard OBD and begin, the RBMS of each monitor is initialized as not action.Described molecule does not increase, and up to having crossed time enough, can make a FAIL decision.For example, pass through if described monitor detects a corresponding test, the time that requires to reach this decision is less than the time that requirement reaches a FAIL decision, so, does not allow to increase molecule, up to determining to described FAIL through time enough.When described fault diagnosis canonical parameter fault presents (DCSCFP) signal is true time, and the second level and subordinate second level OBD control module do not increase described based on ratio monitor molecule.Be set up in case increase molecular state, only effective value that keeps for described standard OBD driving circulation is increased simultaneously.Described state is not inverted to NO ACTION, can not be set to increase denominator.If it is satisfied consistent that the parameter that increases molecule and increase denominator state is set, described state just is set to increase simultaneously.

[0059] when its value of receiving be that genuine fault diagnosis canonical parameter meets (DSCM) signal, the described second level and subordinate second level OBD control module allow to increase based on ratio monitor denominator.When its value of receiving be that genuine fault diagnosis cold start-up parameter meets (DCSCM) signal, the described second level and subordinate second level OBD control module allow to increase cold start-up based on ratio monitor denominator.If it is closed by the DTC relevant with discharging, just do not increase described denominator based on the ratio monitor.

[0060] according to visibly different parameter, the decision that increases described molecule and denominator is asynchronous.The order of incident will drive varying cyclically along with each standard OBD.Correspondingly, wish based on the ratio monitor by carrying out to the possible state value that increases the molecule denominator simultaneously to increasing denominator or increasing denominator from inoperation.

[0061] as mentioned above, master who interrelates or first order OBD control module receive described RBMS packetized signals, it is received control module increases based on ratio molecule and denominator and uses, along with the described transmission second level and/or subordinate second level OBD control module interrelate based on the ratio monitor.Described master or first order OBD control module are carried out the utility function based on ratio, correctly increase and stores based on ratio molecule and denominator, and guarantee be no more than once based on ratio molecule and denominator increase and storage described in each ignition cycle.When each standard OBD drove the circulation beginning, described reception control module was ignored the threshold time (for example, 5 seconds) of described RBMS packetized signals.Like this, avoided in an ignition cycle, repeatedly increasing molecule and/or denominator.The fundamental purpose of described RBMS packetized signals is that employed ratio is stored within main or the first order OBD control module, and like this, the second level and/or subordinate second level OBD control module need be based on foundation structure, software and the NVM of ratio.

[0062] described master and/or first order OBD control module are transmitted described removing diagnostic message (CDI) signal, and it is initialised to vacation when described master and/or first order OBD control module are turned off.Described CDI signal is made as true when having only the diagnostic code that receives correct form when described master and/or first order OBD control module to remove (DCC) order, its all discharging relevant diagnostic information (order) generations of removing/replacements by transmitting from described universal scan instrument.When described CDI signal is made as true time, it keeps true a period of time, and described master and/or first order OBD control module are not stored the failure code that reports to it from any other OBD control module, are converted to vacation then.Can expect that according to special procedure series data structure and other some considerations, some receive the OBD control module can transmit described CDI signal to a subordinate second level OBD control module, and report that a malfunction is to it.

[0063] described reception subordinate second level OBD control module is at the described CDI signal of whole ignition cycle process persistent surveillance.When described CDI signal becomes very from vacation, described reception subordinate second level OBD control module is removed and/or all information of resetting, and it includes but not limited to that all faults diagnose the fault of counter and the temporary derangement code in the storer based on diagnosis/ratio.These require only to be applied in the DTCs by a diagnostic state signal report condition.Communication loss when transmission OBD control module, described reception OBD control module keeps its function just as described CDI signal is set as fictitious time.

[0064] second level OBD control module transmission a plurality of (for example, 4) electric battery diagnostic state (BPDS) packetized signals that interrelates with described ESD or electric battery (that is described BPCM).The state of the DTCs that these signals are used for reporting that all are relevant with electric battery.Each BPDS packetized signals comprises two subsignals, and with a plurality of diagnosis (for example, 32) state of reporting these diagnosis, this state comprises supported state and all do not diagnose the state of indexes by loop cycle.For example, if in fact described second level OBD control module only supports the part subclass of all possible diagnosis, all unsupported diagnosis BPDS packetized signals just have not status of support.

[0065] when powering up, first BPDS packetized signals comprises the diagnostic message to the first diagnosis index (for example, diagnosis index=0).If reported to surpass 32 diagnosis indexes, the 2nd BPDS packetized signals comprises that the rest may be inferred to the diagnostic message of the 33rd diagnosis (for example, diagnosing index=0).Transmitting final diagnosis (for example, diagnosis index=31) afterwards, the process of each BPDS packetized signals begins by sending the first diagnosis frame.() result for example, described HCP, the main OBD control module of described reception can not be used these messages, can not use to be stored in to receive the DTCs of main OBD control module with the default mode of start-up function as receive main OBD control module in fault finding and notice.Require the default mode of fast notification to use effective mark or other direct mechanisms that interrelates with the corresponding input data of using.The fundamental purpose of described BPDS packetized signals is can to store by DTC in the main OBD control module of described reception, and does not require described transmission second level OBD control module burden diagnostic base infrastructure software.The state that described report DTC exponential sum interrelates such as above-mentioned as described in increase or upgrade with the periodic transfer ratio.The state that described report DTC exponential sum interrelates increase unlike the cycle transfer ratio or upgrade piece, so the loss of state that does not have the DTC exponential sum to interrelate.

[0066] described BPDS packetized signals comprises DTC exponential sum DTC state.The DTC index is used as the index of supporting the DTCs table, the specific DTC that indicating status is indicated in the DTCC state.Described DTC state comprises that indication is at the DTC of DTC index diagnostic test state.

[0067] when powering up, the diagnostic test state of each unsupported DTC is initialized as does not support (NOT SUPPORTED), the diagnostic test state of the DTC of each support is initialized to the state (NO STATUS TO REPORT) that does not have report, ends or finish a qualified/failure decision up to described diagnostic test.A Boundary Failure if diagnostic test becomes, the state of report remains on the Boundary Failure state, no longer exists up to described inefficacy parameter, and at this moment described diagnostic test is initialized as the value when powering up.After having reported a qualified or status of fail, described diagnostic state is reinitialized the value when powering up, up to make another one qualified/the failure decision.Require like this is that like this, testing tool can directly show real-time status because main OBD control module provides described diagnostic state to service technician via one 1 byte DTC status signal for each DTC.After the code in the main OBD control module was removed, main OBD control module was abandoned any diagnostic state that receives, and stopped to provide threshold time (for example, 2-3 second) to described diagnostic data manager.

[0068] described second level OBD control module is responsible for each diagnostic assay when described DTC state is to diagnose successfully or diagnose failure.The such mode of borderline failure DTC state representation diagnostic test is ended: the driver has no idea to operate vehicle in remaining described standard OBD driving circulation, and makes described diagnostic test move down.

[0069] the described first order OBD control module that interrelates receives described a plurality of BPDS packetized signals, and it is used for storage failure and give described DTC report a PASS/FAIL by described first order OBD control module.As fault detect with to the result of the delay between the first order OBD control module identification, described first order OBD control module can not be used these information, and DTCs can not be stored in first order OBD control module with the default mode of activation manipulation.The default mode of requirement quick identification must be used and be used in the significant notation that links to each other with respective battery group data.

[0070] fundamental purpose of described BPDS packetized signals is to make DTC can be stored in described first order OBD control module, and does not require the relevant OBD foundation structure software of second level OBD control module burden obedience that interrelates.It is also contemplated that described BPDS packetized signals can also be used to communicating by letter and do not have the state of OBD fault.

[0071] the subordinate second level OBD control module that interrelates with TPIM (that is, described MCPA and MCPB) is transmitted motor control system A/B diagnostic state (MCSDS) packetized signals to the first order OBD control module that interrelates (that is described HCP).Described MCSDS packetized signals is used for reporting that the relevant state of all DTCs is to transmission subordinate second level OBD control module.Described subordinate second level OBD control module is by regular all diagnosis indexes of circulation, use described MCSDS packetized signals report a plurality of diagnosis () state for example, 32, this state comprise that those have reported do not have the state of report with those.For example, if subordinate second level OBD control module is only in fact supported all some subclass of diagnosis, the MCSDS packetized signals of all unsupported diagnosis will be issued to equal unsupported state.

[0072] when powering up, a MCSDS packetized signals comprises the diagnostic message of diagnosis for the first time (for example, diagnosis index=0).If the indexes of the diagnosis above 32 of report, described second MCSDS packetized signals comprise the diagnostic message (for example, diagnosis index=0) of the 33rd diagnosis, the rest may be inferred.Afterwards, diagnose frame to begin the processing of each MCSDS packetized signals having transmitted final diagnosis (for example, diagnosis index=31) by sending a first time.As fault detect with to the result of the delay between the announcement that receives first order OBD control module, described reception first order control module can not be used these messages, and DTCs can not be stored in first order OBD control module with the default mode of activation manipulation.Require the default mode of fast notification must use effective mark or other direct mechanisms that interrelates with the corresponding input data of using.The fundamental purpose of described MCSDS packetized signals is that DTC is provided in the described first order OBD control module storage, does not require the diagnostic base infrastructure software and need not transmit second level subordinate OBD control module.The state that described report DTC exponential sum interrelates such as above-mentioned as described in increase or upgrade with the periodic transfer ratio.The state that described DTC exponential sum interrelates increases unlike described cycle transfer ratio or upgrades soon, so the loss of state that does not have the DTC exponential sum to interrelate.

[0073] described DTC index is used as the index of the table of supporting DTCs and the special DTC of indication, and its state is provided by described DTC status signal.Described DTC state provides the diagnostic test state of the DTC of DTC exponential signal indication.When powering up, the diagnostic test state of each unsupported DTC is initialized as not to be supported, the diagnostic test state of the DTC of each support is initialized to the state that does not have report, ends or finish a qualified/failure decision up to described diagnostic test.

[0074] borderline failure if a diagnostic test becomes, the state of report remains on the borderline failure state, no longer exists up to described disabled status, and at this moment described diagnostic test is reinitialized to the value when powering up.After having reported a qualified or status of fail, described diagnostic state is reinitialized the value when powering up, up to making the qualified or failure decision of another one.This needs, because receive first order OBD control module for each DTC provides described diagnostic state to service technician, directly shows real-time status via described testing tool.After the code in the first order OBD control module was removed, first order OBD control module abandoned any diagnostic state that receives, and stopped to provide threshold time (for example, 2-3 second) to described diagnostic data manager.Described subordinate second level OBD control module is responsible for each diagnostic assay, and when described DTC state is to diagnose to pass through or the diagnosis failure.The DTC state representation of a borderline failure when end by this way by diagnostic test: the driver has no idea to operate vehicle, and makes described diagnostic test move down.

[0075] first order OBD control module that interrelated of described MCSDS packetized signals receives, its use described MCSDS packetized signals storage failure and give described DTC report qualified/failure PASS/FAIL.As fault detect with to the result of the delay between the identification of first order OBD control mould, described first order OBD control module can not be used these messages, and DTCs can not be stored in first order OBD control module with the default mode of activation manipulation.The default mode of requirement quick identification must be used and be used in the validity mark that interrelates with corresponding data.The fundamental purpose of described MCSDS packetized signals is to make DTC can be stored in described first order OBD control module, and does not require that the subordinate second level OBD control module that interrelates requires to obey relevant OBD foundation structure software.It is also contemplated that described MCSDS packetized signals can also be used to communicating by letter and do not have the state of OBD fault.

[0076] described control module calibration identifying information (CMCII) packetized signals is used for transmitting described calibration identification (CID) and described calibration verification numeral (CVN) data from the first order, the second level and/or subordinate second level OBD control module to their main frame OBD control module.The all software and the calibration data that are stored in the specific OBD control module all comprise one or more CIDs and the CVNs that interrelates.

[0077] provide a kind of calibration discrimination index (CII), this calibration discrimination index is the rolling index, can reach 16 CIDs and related with the CVNs that is transmitted.Be used in all CIDs that supported by specific OBD control module from one group of continuous index of index 0 beginning, it is constant that described CII keeps, the frame that interrelates up to all CID and CVN be transmitted (for example, each index before index variation three transmission).

[0078] provides a kind of data mode (DS), represent the state of the current data that are transmitted.Described DS has three kinds of states: CII does not use, and CVN does not calculate with CVN and calculated.The index that described CII does not use the DS state representation just being transmitted does not comprise CID or CVN information.CVN does not calculate the described CVN of DS state representation and is not also calculated in this ignition cycle, when cid information is transmitted by obtaining fast CII.CVN was calculated, and state representation has been calculated the described CID of this ignition cycle and CVN is current CII transmission.Provide a sequence number (SN) and for each CII from zero to two circulation.Described SN represents the frame that is transmitted, and makes and receive 20 bytes that the OBD control module can correctly make up each CII data.

[0079] described reception OBD control module is used described CII and described SN, rebuilds described CID and CVN data and the data mode of itself and it is interrelated.Described reception OBD control module also provides each igniting independence or 20 bytes of battery Stand Alone Memory, stores each CID that receives and CVN.In this kind mode, described CID and CVN distinguish untapped CII, the CII with part numeral that receives, the CVNs of Ji Suaning not, the CVNs with part numeral that perhaps receives and store.CIDs that the storage of described reception OBD control module receives at last and the CVNs that interrelates, and the state of each CII that receives.If receive and do not calculate CVN new CID together, then described CID is stored, and is marked as and has the CID that does not calculate CVN, till receiving the CVN that calculated.

[0080] if forming 3 frames of a CII is to receive as 3 continuous frames, only handles and stores data.When such reaction occurring, described data are along with the information of vehicles categorical data (that is Mo Xing $09) that receives OBD control module oneself is reported.The CIIs data that the DS of CII is not used are not included in the information of vehicles categorical data of report.

[0081] distributed diagnostics structure of the present invention distributed OBD function in the control system that comprises a plurality of systems with corresponding control module.Especially, described distributed diagnostics structure provides a kind of universal method for vehicle, adjusts fault diagnosis and relevant information between a plurality of vehicle control module, guarantees to meet the regulation of government and is that vehicle provides durability with complication system like this.Also have, the quantity of the control module of control OBD device IDs can reduce, but does not reduce the OBD control module quantity of given application.

[0082] those skilled in the art can recognize from the statement of front, and the broad technology enlightenment of the present invention can be implemented in a variety of forms.Therefore, although the present invention describes in detail with relevant specific examples, but true scope of the present invention can not limit by this way, because those skilled in the art is after the claim of having studied accompanying drawing, instructions and having enclosed, it is more clear and definite that other version will become.

Claims (37)

1. distributed vehicle-mounted fault diagnosis (OBD) system of a vehicle control system comprises:

Hu Tongxin a plurality of control modules mutually; And

The main OBD control module of the appointment of one of described a plurality of control modules, wherein, described main OBD control module is carried out the inexecutable function of other described a plurality of control modules, comprise one of following at least function of execution: freeze frame data and measure the OBD status indication of described other a plurality of control modules of ruling malfunction indicator lamp (MIL) state, ruling and storage OBD.

2. whether distributed OBD system according to claim 1 is characterized in that: each described a plurality of control module is carried out OBD algorithms, wherein one of at least working properly to monitor the input, output and the system that interrelate with specific control module.

3. distributed OBD system according to claim 1 is characterized in that: each described a plurality of control module is carried out autodiagnosis.

4. distributed OBD system according to claim 3 is characterized in that: described autodiagnosis comprise inspection with lower device at least one of them: all in ROM, RAM, other storage arrangement and the described specific control module other with discharge relevant peripheral units.

5. distributed OBD system according to claim 1 is characterized in that: if in described a plurality of control module is related, then each of described a plurality of control modules increases the DM based on ratio.

6. distributed OBD system according to claim 1, it is characterized in that: the first order OBD control module that further comprises an appointment that is one of described a plurality of control modules, the DTCs that each described main OBD control module and described first order OBD control module are stored at least one diagnostic trouble code (DTC) corresponding to one of described other a plurality of control modules (DTC) and stored them, one of described other a plurality of control modules are to interrelate with one of described main OBD control module or described first order OBD control module.

7. distributed OBD system according to claim 1, it is characterized in that: the first order OBD control module that further comprises an appointment that is one of described a plurality of control modules, each described main OBD control module and described first order OBD control module store at least one corresponding to one of described other a plurality of control modules based on ratio monitor value and store they based on ratio monitor value, one of described other a plurality of control modules interrelate with one of described main OBD control module or described first order OBD control module.

8. distributed OBD system according to claim 1, it is characterized in that: further comprise the first order OBD control module of the appointment that is one of described a plurality of control modules, the logical OBD signal of each described main OBD control module and described first order OBD control module lock between first communication bus and second communication bus.

9. distributed OBD system according to claim 1, it is characterized in that: further comprise the first order OBD control module of the appointment that is one of described a plurality of control modules, described other a plurality of control modules that each described main OBD control module and the storage of described first order OBD control module and report and one of described main OBD control module and described first order OBD control module interrelate calibration identification and calibration verification numerical information one of at least.

10. distributed OBD system according to claim 1, it is characterized in that: the first order OBD control module that further comprises the appointment that is one of described a plurality of control modules, described first order OBD control module provides signal to described main OBD control module, comprise at least relevant DTC signal of discharging and discharging dependent failure activation signal one of them.

11. distributed OBD system according to claim 1, it is characterized in that: further comprise the first order OBD control module of an appointment of described a plurality of control modules and the second level control module of an appointment, described second level control module provide interrelate based on the ratio monitor information to described main OBD control module and described first order OBD control module one of them.

12. distributed OBD system according to claim 11, the subordinate second level OBD control module that further comprises an appointment in described a plurality of control module, it carries out one of following function at least: only remove failure diagnosis information according to the indication of one of described main OBD control module and described first order OBD control module, calibration identification and calibration verification numerical information are provided for the host computer control module that interrelates.

13. a method that realizes distributed vehicle-mounted fault diagnosis (OBD) function in vehicle control system comprises:

Interconnected a plurality of control module is used for intercoming mutually;

Specifying one of described a plurality of control modules is main OBD control module;

Use described main OBD control module to carry out the inexecutable function of other described a plurality of control modules, comprise one of following at least function of execution: freeze frame data and measure the OBD status indication of described other a plurality of control modules of ruling malfunction indicator lamp (MIL) state, ruling and storage OBD.

14. method according to claim 13 is characterized in that: each described a plurality of control module is carried out OBD algorithms, and whether one of them working properly at least to monitor the input, output and the system that interrelate with specific control module.

15. method according to claim 13 further comprises: each described a plurality of control module is carried out autodiagnosis.

16. method according to claim 15, wherein, described autodiagnosis comprise inspection with lower device one of them: all in ROM, RAM, other storage arrangement and the described specific control module other with discharge relevant peripheral units.

17. method according to claim 13 is characterized in that: if in described a plurality of control module is related, then each of described a plurality of control modules increases the DM based on ratio.

18. method according to claim 13, it is characterized in that: further comprise and specify one of described a plurality of control modules to be first order OBD control module, each described main OBD control module and described first order OBD control module are stored at least one diagnostic trouble code (DTC) corresponding to one of described other a plurality of control modules (DTC) and are stored their DTCs, and one of described other a plurality of control modules interrelate with one of described main OBD control module or described first order OBD control module.

19. method according to claim 13, it is characterized in that: further comprise and specify one of described a plurality of control modules to be first order OBD control module, each described main OBD control module and described first order OBD control module store at least one corresponding to one of described other a plurality of control modules based on ratio monitor value and store they based on ratio monitor value, one of described other a plurality of control modules interrelate with one of described main OBD control module and described first order OBD control module.

20. method according to claim 13, it is characterized in that: further comprise and specify one of described a plurality of control modules to be first order OBD control module, the logical OBD signal of each described main OBD control module and described first order OBD control module lock between first communication bus and second communication bus.

21. method according to claim 13, it is characterized in that: further comprise and specify one of described a plurality of control modules to be first order OBD control module, described other a plurality of control modules that each described main OBD control module and the storage of described first order OBD control module and report and one of described main OBD control module and described first order OBD control module interrelate calibration identification and calibration verification numerical information one of at least.

22. method according to claim 13, it is characterized in that: further comprise and specify one of described a plurality of control modules to be first order OBD control module, described first order OBD control module provides signal to described main OBD control module, comprise at least relevant DTC signal of discharging and discharging dependent failure activation signal one of them.

23. method according to claim 13, it is characterized in that: comprise that further specifying one of described a plurality of control modules is a first order OBD control module and to specify one of described a plurality of control modules be the second level control module of an appointment, described second level control module provide interrelate based on the ratio monitor information to described main OBD control module and described first order OBD control module one of them.

24. method according to claim 23, one that further comprises the described a plurality of control modules of appointment is subordinate second level OBD control module, it carries out one of following function at least: only remove failure diagnosis information according to the indication of one of described main OBD control module and described first order OBD control module, calibration identification and calibration verification numerical information are provided for the host computer control module that interrelates.

25. distributed vehicle-mounted fault diagnosis (OBD) system of a vehicle control system comprises:

More than first control module intercoms mutually by first communication bus;

More than second control module intercoms mutually by the second communication bus; And

It is the main OBD control module of the appointment of one of described more than first and second control modules, wherein: described main OBD control module is carried out the inexecutable function of other described more than first and second control modules, comprise one of following at least function of execution: freeze frame data and measure the OBD status indication of described other more than first and second control modules of ruling malfunction indicator lamp (MIL) state, ruling and storage OBD.

26. distributed OBD system according to claim 25, whether it is characterized in that: each described more than first and second control module is carried out OBD algorithm, wherein one of at least working properly to monitor the input, output and the system that interrelate with specific control module.

27. distributed OBD system according to claim 25 is characterized in that: each described more than first and second control module is carried out autodiagnosis.

28. distributed OBD system according to claim 27 is characterized in that: described autodiagnosis comprise inspection with lower device at least one of them: all in ROM, RAM, other storage arrangement and the described specific control module other with discharge relevant peripheral units.

29. distributed OBD system according to claim 25 is characterized in that: if in described more than first and second control modules is related, then each of described more than first and second control modules increases the DM based on ratio.

30. distributed OBD system according to claim 25 further comprises the first order OBD control module of an appointment that is one of described more than first and second control modules.

31. distributed OBD system according to claim 30, it is characterized in that: each described main OBD control module and described first order OBD control module are stored at least one diagnostic trouble code (DTC) corresponding to one of other described more than first and second control modules (DTC) and are stored their DTCs, and one of other described more than first and second control modules interrelate with one of described main OBD control module and described first order OBD control module.

32. distributed OBD system according to claim 30, it is characterized in that: each described main OBD control module and described first order OBD control module are stored at least one based on ratio monitor value, and store they based on ratio monitor value, described based on ratio monitor value corresponding to one of described other described more than first and second control modules that interrelate with one of described main OBD control module or described first order OBD control module.

33. distributed OBD system according to claim 30 is characterized in that: the logical OBD signal of each described main OBD control module and described first order OBD control module lock between first communication bus and second communication bus.

34. distributed OBD system according to claim 30 is characterized in that: described other described more than first and second control modules that each described main OBD control module and the storage of described first order OBD control module and report and one of described main OBD control module and described first order OBD control module interrelate calibration identification and calibration verification numerical information one of at least.

35. distributed OBD system according to claim 30 is characterized in that: described first order OBD control module provides signal to described main OBD control module, comprise at least relevant DTC signal of discharging and discharging dependent failure activation signal one of them.

36. distributed OBD system according to claim 30, it is characterized in that: further comprise: be the second level control module of an appointment of one of described more than first and second control modules, described second level control module provide interrelate based on the ratio monitor information to described main OBD control module and described first order OBD control module wherein it.

37. distributed OBD system according to claim 36, further comprise: the subordinate second level OBD control module of the appointment of described more than first and second control modules, it carries out one of following function at least: only remove failure diagnosis information according to the indication of one of described main OBD control module and described first order OBD control module, calibration identification and calibration verification numerical information are provided for the host computer control module that interrelates.

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