CN101498617A - Function detection system and method for electric-controlled unit - Google Patents

Function detection system and method for electric-controlled unit Download PDF

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Publication number
CN101498617A
CN101498617A CNA2008100575770A CN200810057577A CN101498617A CN 101498617 A CN101498617 A CN 101498617A CN A2008100575770 A CNA2008100575770 A CN A2008100575770A CN 200810057577 A CN200810057577 A CN 200810057577A CN 101498617 A CN101498617 A CN 101498617A
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China
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signal
ecu
unit
electrical control
control unit
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CNA2008100575770A
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Chinese (zh)
Inventor
李朝晖
张步亮
李金鹏
何文鑫
高志远
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华夏龙晖(北京)汽车电子科技有限公司
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Priority to CNA2008100575770A priority Critical patent/CN101498617A/en
Publication of CN101498617A publication Critical patent/CN101498617A/en

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Abstract

The invention discloses an electronic control unit (ECU) function detecting system, which comprises a signal simulation unit used for generating external sensor signals needed by an ECU in a simulating way, the ECU connected with the signal simulation unit and used for interchanging data information with the signal simulation unit, a controller connected with the signal simulation unit and used for detecting the function of the ECU according to the data information of the signal simulation unit and the ECU. The function detecting system can judge if the ECU has fault in such a way that hardware is utilized to simulate the running environment of the ECU and the controller is used for detecting the running condition of the ECU. The invention can accurately detect the function of the ECU and has the advantages of simple structure, low cost, and the like.

Description

A kind of function detecting system of ECU (Electrical Control Unit) and detection method

Technical field

The present invention relates to engine art, particularly relate to a kind of function detecting system and detection method of ECU (Electrical Control Unit).

Background technology

Motor car engine ECU (Electronic Control Unit, ECU (Electrical Control Unit)) is the vehicle-mounted computer control system of a complexity.Detection method for ECU mainly is to test two kinds of methods by the real vehicle check with based on computer-controlled from car at present.Real vehicle detects ECU is placed on the actual automobile mainly in the difference of the test environment of ECU for this two kinds of detection methods different, and all input and output of ECU all directly are connected with automobile, and all data all are to adopt measured data in fact; And computer-controlled the test from car divided engine bench test and clear data emulation testing, engine bench test is connected on ECU on the engine pedestal, motor car engine on the stand provides data, by stand instrument control engine running, the test of line data simulation then is to imitate motor car engine completely, the environment of a full emulation of structure is given the ECU inputoutput data.

Real vehicle detects and is subjected to multiple factor affecting such as plant equipment, sensor, can not well judge the quality of ECU; Though and computer-controlledly can solve the problem that parameter changes preferably from the car method of testing because system and the technology developed are all too huge in the past, cost is too expensive, has limited its application and popularization.

Summary of the invention

The purpose of this invention is to provide a kind of simulation and realize the ECU external environment condition, and can accurately detect the detection system and the detection method of ECU function.

For achieving the above object, on the one hand, technical scheme of the present invention provides a kind of function detecting system of ECU (Electrical Control Unit), comprising: the signal imitation unit is used to simulate the required external sensor signal of generation ECU (Electrical Control Unit); ECU (Electrical Control Unit) is connected with described signal imitation unit, is used for and described signal imitation elements exchange data message; Controller is connected with described signal imitation unit, is used for the data message according to described signal imitation unit and ECU (Electrical Control Unit), and described ECU (Electrical Control Unit) is carried out Function detection.

Wherein, the function detecting system of described ECU (Electrical Control Unit) also comprises: load unit, described load unit comprises fuel injector, ignition coil, spark plug, stepper motor, described load unit is connected with described signal imitation unit, is used for carrying out with described signal imitation unit the exchanges data of fuel injection signal, ignition signal, stepper motor signal.

Wherein, described controller also comprises: the data acquisition subelement, be connected with described signal imitation unit, and be used for described signal imitation unit and send the calculating of sampling of physics electric signal; Data Detection and comparer unit are connected with described data acquisition subelement, are used for the physics electric signal that calculates through described data acquisition subelement sampling is handled, and search the fault of described ECU (Electrical Control Unit).

Wherein, described controller also comprises: control command is handled subelement, be connected with described signal imitation unit, be used to produce control signal, and the feedback signal of described control signal is carried out message based command process control described signal imitation unit and ECU (Electrical Control Unit).

Wherein, the function detecting system of described ECU (Electrical Control Unit) also comprises: display unit, be connected with described controller, and be used to show the fault of described ECU (Electrical Control Unit).

On the other hand, technical scheme of the present invention provides a kind of function detecting method of ECU (Electrical Control Unit), may further comprise the steps: the signal imitation unit simulation produces the external sensor signal of ECU (Electrical Control Unit); ECU (Electrical Control Unit) is calculated according to described external sensor signal, obtains output signal, and calculates internal numeric; Controller is handled according to described output signal and internal numeric, and described automatically controlled function is detected.

Wherein, according to the control signal of input signal on the signal imitation unit or the transmission of described controller, described signal imitation unit simulation produces the external sensor signal of ECU (Electrical Control Unit).

Wherein, described controller is according to described output signal and internal numeric, handle, described automatically controlled function detected specifically comprise: obtain the absolute value of the difference of described output signal and internal numeric, judge described absolute value whether in the error range that described internal numeric allows, if, then ignore this error, if not, then, this fault is reported an error according to the bug list of described ECU (Electrical Control Unit).

Technique scheme only is an optimal technical scheme of the present invention, has following advantage: by utilizing the running environment of hardware simulation ECU, utilize controller that the ruuning situation of ECU is detected, thereby judge whether ECU breaks down.The present invention can accurately detect the function of ECU, and have simple in structure, low cost and other advantages.

Description of drawings

Fig. 1 is the connection diagram of function detecting system of a kind of ECU (Electrical Control Unit) of the embodiment of the invention;

Fig. 2 is the structural representation of function detecting system of a kind of ECU (Electrical Control Unit) of the embodiment of the invention;

Fig. 3 is the process flow diagram of function detecting method of a kind of ECU (Electrical Control Unit) of the embodiment of the invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.

Fig. 1 is the connection diagram of function detecting system of a kind of ECU (Electrical Control Unit) of the embodiment of the invention, Fig. 2 is the structural representation of function detecting system of a kind of ECU (Electrical Control Unit) of the embodiment of the invention, in conjunction with Fig. 1, Fig. 2, the function detecting system of ECU (Electrical Control Unit) has comprised 4 parts: engine electric-controlled unit ECU1, signal imitation unit 2, controller 3, load unit 4.As shown in the figure, in these 4 parts, signal imitation unit 2 is key points of total system, and other 3 parts all only are connected with it, and all data relays and conversion are all by the signal imitation unit.Controller 3 can be that PC, server or other satisfy the opertaing device of function, and graphical element is housed in the controller 3, can control ECU (Electrical Control Unit) 1 and 2 work of signal imitation unit.Its annexation is with shown in the figure: signal imitation unit 2 is connected all wire harness transmission signals of signals collecting line 5 transmission by signals collecting line 5, CAN order wire 6, serial communication line (K bus) 7 with controller.CAN order wire 6 meets the order of CAN bus standard, and one is connected with the signal imitation unit, and the other end is that the USB joint connects controller 3.Serial communication line (K bus) 7 meets automobile industry KWP2000 standard.Signal imitation unit 2 is by the mutual all data of wire harness 8 and Engine ECU, the signal of wire harness 8 transmission comprises cell voltage signal, firing key signal, distributive value signal, ignition signal, the stepper motor signal, camshaft signal, crankshaft signal, engine rotational speed signal, vehicle speed signal, water temperature signal, throttle opening signal.Signal imitation unit 2 is connected with load unit 4 by load signal line 9, the signal of load signal line 9 transmission comprises fuel injection signal, ignition signal, the stepper motor signal, load unit 4 is optional equipments, be provided with fuel injector, ignition coil, spark plug, stepper motor, these four parts are directly used corresponding fuel injection signal on the load signal line 9, ignition signal, directly driving work such as stepper motor signal does not need to change with circuit in addition, because used actual engine components, so just remedied traditional from the validity deficiency of car test survey on practical devices and data.ECU1 carries out alternately with signal imitation unit 2 exactly with outside all data interactions, and it is connected by wire harness 8 all signals with the signal imitation unit.Signal imitation unit 2 among the figure passes the signal of coming to other unit following processing:

For the diagnostics lines signal of ECU signal and load unit signal, signal imitation unit 2 does not carry out any operation, only does a transfer, this part signal directly is transferred to the data acquisition subelement handles.

For switching value signal in ECU signal and the load unit signal (as the air-conditioning switch signal, the relay switch signal) and status signal (as engine condition signal), signal imitation unit 2 carries out analog to digital conversion; Greater than the simulating signal of 5V, the signal imitation unit is between these signal range of decrease to 0~5V for amplitude range in ECU signal and the load unit signal, and with these conversion parameter records, and be input in the controller 3.

(whether export fuel injection signal for the control signal of the manual input of user or the control command signal of signal imitation unit and ECU as control, control throttle opening signal is 20%), translate them signal imitation unit 2, and by in the signal imitation unit 2 programmed chips order is handled, generate corresponding electrical signal transfer and give other unit.Translate be meant user just manually the control command signal of the control signal of input or signal imitation unit and ECU according to being translated into the ECU readable signal in the automobile industry standard, this translation method belongs to prior art, be not described in detail, table 1 is the command format explanation of self-defined logical view agreement among the present invention.

Table 1

The control command that the software end sends Command number Command parameter Test and Detection case feedback number Order 1 (as reading the ECU state) 01H 00 01 A1??? Ordered for 2 (as throttle opening is set) 02H 64H (aperture 100%) 66H(02H+64H) A2 Ordered for 3 (as water temperature is set) ??? 03H 50H (water temperature 80 degree) ???????????? 53H(03H+50H) ?? A3 ...... ...... ...... ...... ......

Load unit 4 is only realized the exchange of data with signal imitation unit 2, signal imitation unit 2 can come the operation of simple control load unit by command signal.Load unit 4 is then with fuel injector, ignition coil, and spark plug, the electric signal of the working order of stepper motor is returned to the signal imitation unit.

Signal imitation unit 2 is behind the signal that has received ECU1 and load unit 4, with the voltage in the signal, frequency, physics electric signal such as pulsewidth flow to the data acquisition subelement in the controller, and the concrete internal numeric that will read out in ECU flows to the bus communication subelement the controller.The data acquisition subelement of controller 3 need carry out physical signalling a classification, and to the signal calculating of sampling.Sampling calculate to be exactly to carry out according to the requirement that concrete ECU producer provides, and for example, a certain concrete ECU producer requires sampling 100 times, then samples 100, calculates then, and this sampling is calculated and adopted the sampling of adopting usually to calculate means, therefore, no longer describes in detail.Wherein multiple parameter setting such as sampled point is a scalable.And the bus communication subelement has comprised serial communication bus (K bus) 7 and CAN order wire 6, and 5 three parts of signals collecting line.Use the communication of data queue in order to processing signals collection line 5 and serial communication bus (K bus) 7 in controller 3, the communication of CAN order wire 6 then realizes separately.

After the processing of data through the data acquisition subelement, give Data Detection and comparer unit to handle, this unit receives the detected parameters and the ECU internal numeric parameter of outside input simultaneously, the detected parameters of outside input and ECU internal numeric not exclusively are one to one also, if that is to say in the outside input P1 signal arranged, might not have a P1 numerical value in the ECU internal numeric, the internal numeric of ECU is some numerical value of reaction ECU internal processes state, it has the type of what numerical value and numerical value and scope value to be provided by the producer of ECU, and these parameters have difference again according to the difference of ECU and the difference of test item.Whether Data Detection and comparing unit will use new boolean's comparison algorithm to come the judgment data signal rationally errorless.This algorithm is by data value signal is sampled once more, and multiply by the relevant parameters value, data itself is carried out the calculating of a stack again, and the value that obtains at last compares with sensing range again, determines whether current demand signal is effective and reasonable; Simultaneously, whether data after inspection is handled and the internal numeric of ECU mate, and whether whether ECU inside contains diagnostic trouble code, effective with detection signal.For most output signal value, ECU can have a corresponding internal numeric to react it in its program inside, therefore output signal value and ECU internal numeric should be very approaching, less than 1% of this signal range ability, range ability is difference poor divided by the possible minimum value of the possible maximal value of signal and signal again of output signal value and ECU internal numeric such as the difference of two numerical value.If the difference of output signal value and ECU internal numeric has surpassed certain value (this numerical value is specifically provided by ECU manufacturer, and different producer's numerical value is different), then can report an error, report ECU input/output error under this signal.If the difference of output signal value and ECU internal numeric in this error range, is then ignored this error.

After the difference of output signal and internal numeric has been compared in detection, begin to detect respectively the numerical range of output signal and the numerical range of internal numeric.Because the not all output signal that begins to mention all has corresponding ECU internal numeric, so, need carry out the rational detection of numerical value respectively to them for many ECU internal numeric and outside output signal.Suppose that with input signal A be example, the minimax adjustable range of its signal is B, its expectation span is C (A wherein, B, C provides data by ECU manufacturer), so A and B are compared, if A is less than the minimum value of B or the A maximal value greater than B, then the numerical value of signal A has exceeded numerical range, and reports an error.Again A and C are compared, if (A is not greater than the maximal value C of C in desired numerical range for the numerical value of A MAXOr A is less than the minimum value C of C MIN), according to difference (C MAX-A or A-C MIN), by corresponding bug list (this bug list is provided by the former factory of ECU, and they provide the source and the scope of signal, also just simultaneously go beyond the scope mistake when undesired of definition signal), can find possible fault and mistake.

Be divided into several sections through the data after the bus communication processing, a part is internal data and the inner diagnostic trouble code of ECU, gives Data Detection and comparing unit to handle, and passes to display unit simultaneously and is shown to the terminal user; Another part is the feedback signal of control command, gives control command to handle subelement and handles.

Control command is handled subelement except require to produce the control signal to signal imitation unit and ECU according to customer requirements or program itself, also control command is returned the feedback signal of coming and carries out message based command process control.Its message comprises the following aspects: the control command of the panel of signal imitation unit input, signal feedback, the signal error information feedback of ECU, communicate by letter successfully or the processing of losing efficacy, the processing of data acquisition.

Data of handling more than the warp and state logic value finally give display unit to show.And display unit finally is stored as text modality with all data and daily record.

The present invention comprises signal imitation unit manually simulation and two kinds of control situations of the automatic simulation of computing machine, manually simulation is the generation of controlling analog sensor signal by the button on the signal imitation unit panel, the signal imitation unit panel is provided with a plurality of switching value buttons, respectively corresponding each switching value signal, by Closing Switch amount button, reach the purpose that produces analog switch amount signal.Also be provided with a plurality of digital regulation resistance turn-knobs on the signal imitation unit panel, the signal that corresponding respectively each external sensor produces.For example, rotary knob, simulation generation throttle opening transfers to 30% signal, and water temperature is adjusted to the signals of 90 degree etc.

The needed external sensor signal of arrangement ECU, analyze its characteristics of signals, the signal imitation unit is according to the difference of their characteristics of signals, one of all corresponding wherein hardware circuit board of each signal inputs or outputs, input is provided by the rat tail of the switch on the signal imitation unit panel, potentiometer or ECU, output then with the ECU wire harness, the electronic display on the panel, signal lamp connects.For water temperature, admission pressure, intake air temperature, engine speed, these signals of vehicle speed signal, hardware circuit board is then used their current potentiometer voltage of signals amplitude of programmable chip record, is multiplied by ratio value again and produces corresponding numerical signal.The ratio formula is: ratio value=physical signalling maximum magnitude/potentiometer adjustable potential maximum magnitude.And because crankshaft signal is that (such as certain engine crankshaft number of teeth is that 30 teeth lack 2 teeth to the signal of being with hypodontia, 28 actual teeth and the hypodontia that width is 2 teeth are promptly arranged), so a counter is set in programmable chip, when Counter Value reaches the maximum number of teeth at every turn, the output hypodontia, and counter reset, actual tooth of output when counter does not reach the maximum number of teeth, back and forth go down is exactly the crankshaft signal that simulates always.

Define the movable adapter that making can be for convenience detach according to the wire harness definition of ECU and the wire harness of signal imitation unit.The Usage data collection card is connected its data acquisition interface with the signal imitation unit, with the part signal data acquisition on the ECU wire harness and output on the controller.Software through pictures is installed on the controller.This software can be controlled ECU running environment by the control signal analogue unit by current line of serial and signal imitation unit communication; This software by the wire harness signal that detect to gather comes range of signal and logical value judge ECU current whether move normal; And this software can also directly link to each other with ECU by the CAN order wire, directly reads the internal numeric among the ECU.With ECU, control it, the signal imitation unit interconnects, and powers up for the signal imitation unit, chooses the manual control model in signal imitation unit, every signal lamp variation on the observation panel and the every data on the electronic display.With ECU, control it, the signal imitation unit interconnects, and powers up for the signal imitation unit, chooses the computer control pattern, uses software simulation control ECU, monitors every data of ECU in real time, detects and read the error code of ECU.

Fig. 3 is the process flow diagram of function detecting method of a kind of ECU (Electrical Control Unit) of the embodiment of the invention, and in conjunction with Fig. 3, concrete steps are as follows:

1. give the signal imitation unit by user or controller transmitting control commands, by the knob on the signal imitation unit throttle opening is transferred to 30% such as the user, water temperature is adjusted to 90 degree.

2. control signal is translated in the signal imitation unit, and produces electric signal and output on the wire harness to ECU, and promptly the voltage of 30% throttle opening and the hydraulic signals of 90 degree water temperatures are exported in the signal imitation unit.

3.ECU after detecting electric signal, think the external engine environmental change, calculate according to current electrical signal, obtain the signal that will export, i.e. fuel injection signal, ignition signal, stepper motor signal etc.

4.ECU after detecting electric signal, at the signal that obtains exporting (as fuel injection signal, ignition signal, stepper motor signal etc.) time, by the CAN order wire, serial communication line (K bus) is with the injection time of its internal calculation, ignition advance angle, stepper motor steps, internal numeric such as self internal fault sign indicating number is transferred to controller.

5. the signal of the collection ECU of controller output, receive the internal numeric that ECU transmits simultaneously, these two of comparisons are worth whether error is less than input parameter value (such as 0.1%) earlier then, (correct value obtains by experiment repeatedly with the comparison of correct numerical range again, also can provide parameter) by engine manufacturer, use the difference of contrast to search bug list, show that finally ECU is out of order and faults itself sign indicating number (bug list also obtains by repeatedly testing, and also can be provided by engine manufacturer).This step is that program is constantly back and forth carried out, and each signal is all taked above identical test mode.Controller detects the value (is 12.16V such as detecting battery voltage) of the signal on the ECU wire harness, the internal numeric (being 12.15V) of using CAN bus and K bus reception ECU to transmit simultaneously such as reading inner battery voltage value, these two values are subtracted each other and the A that takes absolute value, if the span of this signal is B, then obtain C divided by B with A, if C is less than the serious forgiveness (such as 0.1%) of this signal, think that then the physical values of this signal is consistent with the logical value of ECU inside, then continue next the detection; If greater than the serious forgiveness of this signal, think that then this signal physical values and logical value are inconsistent, stop test and provide the information of reporting an error

6. last controller is recorded as text with test result, and monitoring finishes.

CAN (Controller Area Network) is a controller local area network, is one of most widely used fieldbus in the world.CAN appears in the auto industry at the end of the eighties at first, is proposed at first by German Bosch company.At that time, because the consumer is more and more for the requirement of automobile function, and the realization of these functions was based on electronic operation mostly, and this just makes the communication between the electronic installation become increasingly complex, and means the more signal wire that connects of needs simultaneously.The initial motivation that proposes the CAN bus is exactly in order to solve the communication between the electronic-controlled installation huge in the Hyundai Motor, to reduce ever-increasing signal wire.So they have designed a single network-bus, all peripheral components can be articulated on this bus.1993, CAN became international standard ISO11898 (high-speed applications) and ISO11519 (low-speed applications).

At present, CAN extensively is designed as the microcontroller communication in the automotive environment, and exchange message between vehicle-mounted each electronic-controlled installation ECU forms the Vehicle Electronic Control network.Such as: in engine management system, gearbox control, instrument equipment, the electronics trunk system, all embed the CAN control device.CAN is a kind of serial communication bus of many master modes, and basic design specifications requires that high bit rate is arranged, high anti-electromagnetic interference (EMI), and can detect any mistake of generation.When signal transmission distance reached 10Km, CAN still can provide the message transmission rate up to 50Kbit/s.

ECU comprises (K bus) external order wire, and the K bus is used for the bidirectional data transfers of self diagnosis instrument to ECU.Channel detection is to power on to ECU, communicates by letter with PC with the K bus, and some passage situations are shown on the PC.

As can be seen from the above embodiments, the embodiment of the invention utilizes controller that the ruuning situation of ECU is detected by utilizing the running environment of hardware simulation ECU, thereby judges whether ECU breaks down.The present invention can accurately detect the function of ECU, and have simple in structure, low cost and other advantages.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1, a kind of function detecting system of ECU (Electrical Control Unit) is characterized in that, comprising:
The signal imitation unit is used to simulate the required external sensor signal of generation ECU (Electrical Control Unit);
ECU (Electrical Control Unit) is connected with described signal imitation unit, is used for and described signal imitation elements exchange data message;
Controller is connected with described signal imitation unit, is used for the data message according to described signal imitation unit and ECU (Electrical Control Unit), and described ECU (Electrical Control Unit) is carried out Function detection.
2, the function detecting system of ECU (Electrical Control Unit) as claimed in claim 1 is characterized in that, the function detecting system of described ECU (Electrical Control Unit) also comprises:
Load unit, described load unit comprises fuel injector, ignition coil, spark plug, stepper motor, described load unit is connected with described signal imitation unit, is used for carrying out with described signal imitation unit the exchanges data of fuel injection signal, ignition signal, stepper motor signal.
3, the function detecting system of ECU (Electrical Control Unit) as claimed in claim 2 is characterized in that, described controller also comprises:
The data acquisition subelement is connected with described signal imitation unit, is used for described signal imitation unit and sends the calculating of sampling of physics electric signal;
Data Detection and comparer unit are connected with described data acquisition subelement, are used for the physics electric signal that calculates through described data acquisition subelement sampling is handled, and search the fault of described ECU (Electrical Control Unit).
4, the function detecting system of ECU (Electrical Control Unit) as claimed in claim 3 is characterized in that, described controller also comprises:
Control command is handled subelement, is connected with described signal imitation unit, is used to produce the control signal to described signal imitation unit and ECU (Electrical Control Unit), and the feedback signal of described control signal is controlled.
5, the function detecting system of ECU (Electrical Control Unit) as claimed in claim 1 is characterized in that, described signal imitation unit also comprises:
Display unit is connected with described controller, is used to show the fault of described ECU (Electrical Control Unit).
6, a kind of function detecting method of ECU (Electrical Control Unit) is characterized in that, may further comprise the steps:
The signal imitation unit simulation produces the external sensor signal of ECU (Electrical Control Unit);
ECU (Electrical Control Unit) is calculated according to described external sensor signal, obtains output signal, and calculates internal numeric;
Controller is handled according to described output signal and internal numeric, and described automatically controlled function is detected.
7, the function detecting method of ECU (Electrical Control Unit) as claimed in claim 6 is characterized in that, according to the control signal of input signal on the signal imitation unit or the transmission of described controller, described signal imitation unit simulation produces the external sensor signal of ECU (Electrical Control Unit).
8, the function detecting method of ECU (Electrical Control Unit) as claimed in claim 7 is characterized in that, described controller is handled according to described output signal and internal numeric, described automatically controlled function is detected specifically comprise:
Obtain the absolute value of the difference of described output signal and internal numeric, judge described absolute value whether in the error range that described internal numeric allows, if, then ignore this error, if not, then, this fault is reported an error according to the bug list of described ECU (Electrical Control Unit).
CNA2008100575770A 2008-02-03 2008-02-03 Function detection system and method for electric-controlled unit CN101498617A (en)

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CN101833331A (en) * 2010-05-21 2010-09-15 北京理工大学 Testing system and method for electronic control unit of automobile engine
CN102339057A (en) * 2011-03-25 2012-02-01 潍柴动力股份有限公司 Signal generating device for electronic system of automobile
CN102866016A (en) * 2012-10-18 2013-01-09 徐州重型机械有限公司 Rapid diagnostic instrument and diagnostic method for engine failure of mobile crane
CN102928690A (en) * 2012-09-28 2013-02-13 珠海德百祺科技有限公司 Anomaly detection method for electronic device
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CN101833331A (en) * 2010-05-21 2010-09-15 北京理工大学 Testing system and method for electronic control unit of automobile engine
CN102339057A (en) * 2011-03-25 2012-02-01 潍柴动力股份有限公司 Signal generating device for electronic system of automobile
CN103907003A (en) * 2011-10-28 2014-07-02 本田技研工业株式会社 Vehicle diagnostic method, and external diagnostic device
CN102928690A (en) * 2012-09-28 2013-02-13 珠海德百祺科技有限公司 Anomaly detection method for electronic device
CN102928690B (en) * 2012-09-28 2015-11-25 珠海德百祺科技有限公司 For the method for detecting abnormality of electron device
CN102866016A (en) * 2012-10-18 2013-01-09 徐州重型机械有限公司 Rapid diagnostic instrument and diagnostic method for engine failure of mobile crane
CN102866016B (en) * 2012-10-18 2015-07-22 徐州重型机械有限公司 Rapid diagnostic instrument and diagnostic method for engine failure of mobile crane
CN104298972A (en) * 2014-10-08 2015-01-21 广东美的制冷设备有限公司 Household device state recognition method and system and mobile terminal
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