CN105179134A - Common rail system fault diagnosis system - Google Patents

Abstract

The invention provides a common rail system fault diagnosis system. The common rail system fault diagnosis system comprises a fault type selection interface, fault type operation interfaces, a fault code inquiry interface and a learning function interface, wherein the fault type selection interface is used for displaying various common fault types of an engine, people can have access to the corresponding fault type operation interface after selecting a fault type, the fault type operation interfaces are used for displaying various diagnosis steps and normal data or normal graphs during diagnosis, the fault code inquiry interface is used for displaying the meaning of the current fault code and dealing measures, and the learning function interface is used for adding diagnosis steps which are not contained in the original system to the system. By the adoption of the common rail system fault diagnosis system, diagnostic reasoning can be conducted according to the fault type, detailed diagnosis steps can be provided, and fault diagnosis can be instructed; the position of the current diagnosis step in the whole diagnosis process and the diagnosis operation process can be learnt during diagnosis; the meaning of the fault code can be inquired; diagnosis methods which are not contained in the system can be learnt and added to the system.

Description

Common Rail System Fault Diagnosis System

technical field

The invention relates to maintenance of a high-pressure common rail fuel system, in particular to a common rail system fault diagnosis system.

Background technique

Now that diesel engines use electronic control technology, the system is becoming more and more complex. When a diesel engine fails, it is not a simple matter to quickly find the cause of the failure and the faulty parts. Although it is possible to determine the cause of some faults with the help of the fault light flashing, the help of the service manual, or reading the key parameters of the diagnostic instrument, in many cases (for example, the EUC function is not perfect, and the fault code cannot be displayed for some faults; or responsible Maintenance technicians are not very experienced), and the fault diagnosis of diesel engines still takes quite a while.

Among the existing patents, there are two patents related to the content of fault diagnosis, Japanese Patent Application Publication No. 07-076720 and US Publication No. 2001/0002450.

Japanese Patent Application Laid-Open No. 07-076720 checks the service manual through the fault code, and then determines the location of the specific fault according to the given inspection steps. If there is no clear fault code in the actual system, it is not easy to check out the fault with this method; and the method of checking against the manual is time-consuming.

U.S. Bulletin No. 2001/0002450 provides maintenance guidance to maintenance personnel based on the fault diagnosis program, but the relationship between each diagnostic step is not displayed, so maintenance personnel cannot know where the current diagnostic work is located in the entire diagnostic program, and do not know the current work. purpose and meaning.

Contents of the invention

The purpose of this invention is to overcome the deficiencies of the prior art and provide a systematic, standardized and comprehensive fault diagnosis system to determine the cause of the fault of the common rail diesel engine, thereby effectively improving the diagnostic efficiency of maintenance personnel, even without much work Experienced maintenance personnel can also carry out fault diagnosis smoothly with the help of this method.

The technical solution adopted by the present invention is that the common rail system fault diagnosis system includes: a fault type selection interface, a fault type operation interface, a fault code query interface and a learning function interface, and the fault type selection interface is used to display the common faults of the engine. For various fault types, select a fault type to enter the corresponding fault type operation interface; the fault type operation interface is used to display various diagnostic steps and standard data or standard graphics during diagnosis. For different fault types, there are corresponding The inspection process and comparison standard; the fault code query interface is used to display the meaning and treatment measures of the current fault code; the learning function interface is used to add diagnostic steps not included in the original system to the system.

The failure type selection interface includes a plurality of failure type buttons for selecting the failure type, and also includes a learning button for opening the learning function interface to enter the learning mode; the failure type operation interface includes: failure type display area, diagnosis step display area , Diagnosis process display area, operation method display area and diagnosis result display area.

The fault type operation interface can simultaneously display the fault type currently being processed, the current diagnosis step, the position of the current diagnosis in the entire diagnosis process, and the standard data or graphics used in the current step, and also provide the current processing step The specific operation method: display the diagnosis result in the diagnosis result display area, when a fault cause is found during the diagnosis process, the fault cause and solution will be displayed in the diagnosis result display area, and ask whether the problem is solved, if so, end the diagnosis, Otherwise, continue to the original step diagnosis.

The fault step display area is used to display the current fault diagnosis steps under the current fault type, and the standard data or standard graphics of this step, including the current step display box, the current step correct value display box and the current step reference figure text box; The diagnosis result display area includes the fault cause display area and the solution display area; after clicking the "Start" button, the first diagnostic step is displayed in the current step display box, and the current normal value or Standard value, if there is a graph displayed in the diagnosis step of this step, the corresponding graph will be displayed in the reference graph text box of the current step; the maintenance personnel will check according to the diagnosis step, if the check value is correct, click the "Normal" button, and the system will automatically The second diagnostic step is displayed in the display box. If it is incorrect, click the "Error" button. If the system needs further inspection, a more subdivided diagnostic step will be displayed in the current step display box; if there is no inspection step If it is found, the cause of the fault will be displayed in the fault cause display area, and the solution will be displayed in the solution display area; a standardized diagnosis process has been saved in the system, and the above-mentioned processes are executed in sequence until the fault cause is found.

The diagnostic process display area is used to display the flow diagram of the diagnostic steps required for the current fault type, and the figure shows an overview of all the steps of the current fault type, the steps that have been executed, the steps that are currently executed and the steps that are not executed Differentiate with a different color or style.

The flow diagram of the diagnostic steps uses tree nodes and branches to represent diagnostic steps and associations. If the current diagnostic step is a more specific expansion of the previous diagnostic step, the current step is displayed vertically to the previous step; if the current diagnostic step and If the previous diagnosis step is in parallel, the current step will continue to be displayed along the direction of the previous step; if all the steps in the current direction are executed, switch back to the initial step of the direction change according to the execution sequence or directly, and continue unchanged Execution in the original direction; the user can freely switch to the required step on the diagnostic step flow diagram, and the diagnostic content and standard data or graphics corresponding to this step are also updated in the fault step display area at the same time.

Click the "Normal" button once in the fault type operation interface, and in the diagnosis step flow diagram, the next step node will be displayed according to the current execution direction; click the "Error" button once, then the current execution direction will be changed and the next step will be displayed. step node.

The fault code query interface includes a fault code input box, a fault code meaning display area, and a treatment measure display area. The fault code is input into the fault code input area, and the fault code meaning is displayed in the fault code meaning display area. The treatment measures for each fault code are displayed in .

The learning function interface includes text boxes for inputting fault types, diagnosis steps and normal or standard values of the steps, and an "Add" button for saving the inputted content to the system. The learning function interface also includes a current step reference picture input box, which is used to input the picture of this step.

When the engine fails, you can tell the maintenance personnel about the failure of the engine, and the maintenance personnel use this system to troubleshoot according to the fault description:

(1) According to the obtained fault type, select the fault type on the fault type selection interface 20, and then enter the different fault type operation interface 100;

(2) After entering the corresponding fault type operation interface 100 , operate step by step according to the prompt steps on the interface until the fault problem is found.

When a diesel engine equipped with a common rail system fails, the system provided by the invention can be used for troubleshooting, so as to quickly find out the cause of the failure, accurately find the faulty parts, and complete the system's fault diagnosis. Advantage of the present invention has:

(1) According to the fault phenomenon of the engine, it can directly enter the diagnosis step, which is simple in form and convenient for maintenance personnel to understand and operate;

(2) The common rail system fault diagnosis system can be learned later, updated and perfected, with both pictures and texts, and a friendly user interface.

(3) There are strict diagnostic steps to guide maintenance personnel in fault diagnosis, and can display the position of each step in the entire diagnosis process, and each step of inspection can give standard data or standard graphics, and maintenance personnel can compare these standard values Determine the cause of the failure.

(4) Improve the maintenance efficiency, reduce the maintenance cost, and reduce the use cost of the engine, which has high economic benefits.

Description of drawings

Figure 1 is a general diagnostic flow chart of the present invention.

Fig. 2 is a fault type selection interface diagram of the present invention.

Fig. 3 is a fault type operation interface diagram of the present invention.

Fig. 4 is an interface diagram of the diagnosis step display area in the fault type operation interface of the present invention.

Fig. 5 is a flow chart of diagnosis steps in the fault type operation interface of the present invention.

Fig. 6 is a fault code query interface diagram of the present invention.

Fig. 7 is an interface diagram of the diagnosis result display area in the fault type operation interface of the present invention.

Fig. 8 is a learning function interface diagram of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

The present invention includes: a fault type selection interface 20, a fault type operation interface 100, a fault code query interface 121, and a learning function interface 151. The fault type selection interface 20 is used to display various common fault types of the engine, and select a fault type Then enter the corresponding fault type operation interface 100; the fault type operation interface 100 is used to display various diagnostic steps and standard data or standard graphics during diagnosis. For different fault types, there are corresponding special inspection processes and comparison standards; The fault code query interface 121 is used to display the meaning and treatment measures of the current fault code; the learning function interface 151 is used to add diagnostic steps not included in the original system to the system.

As shown in Figure 1, the general diagnostic process of using this system is:

1. Open the fault diagnosis software, and the fault type selection interface 20 appears.

2. Select the fault type on the fault type selection interface 20 according to the actual fault problem, and then automatically jump to the fault type operation interface 100 .

3. Perform each step of fault detection according to the prompts.

4. The system asks whether the cause of the fault has been found, if found, go to step 10; if not found, go to step 5.

5. Ask whether all the steps have been completed, if not all steps have been detected, then jump to step 4 for execution; if the detection is completed, go to step 6.

6. Ask whether it has been checked twice. If it has not been checked twice, start the diagnosis from the beginning to prevent some intermediate steps from being incompletely diagnosed; if the reason is still not found after the second inspection, go to step 7.

7. It needs to be solved manually by experienced maintenance personnel.

8. Ask whether you need to start self-learning, if yes, go to step 9, if not, go to step 10. Users can input new solutions into the system according to their needs, so that the system has a self-learning function.

9. The system jumps to the self-learning interface 151 to start the self-learning function.

10. Display the fault cause and solution, and end the diagnosis.

As shown in FIG. 2 , a fault type selection interface 20 is provided for selecting a fault type. The fault type selection interface 20 includes: unable to start button 21, black smoke button 22, white smoke button 23, engine shaking button 24, high fuel consumption button 25, power shortage button 26, sudden flameout button 27 and learning button 28.

The maintenance personnel can click the corresponding buttons 21-27 according to different fault phenomena to choose to enter different fault operation interfaces.

The learning button 28 is a button for entering the learning interface.

As shown in FIG. 3 , a fault type operation interface 100 is provided, which is used to select different diagnosis steps according to different fault types. The fault type operation interface block diagram 100 includes: a fault type display area 101 , a diagnosis step display area 102 , a diagnosis process display area 103 , an operation method display area 104 and a diagnosis result display area 105 .

The failure type display area 101 is used to display various failure types. In this embodiment, the failure types include failure to start, black smoke, white smoke, engine vibration, high fuel consumption, insufficient power and sudden flameout. Which fault type is currently being processed will be highlighted. If you want to switch to other fault types, you can also directly click on this fault type to switch without returning to the fault type selection interface 20 .

The fault step display area 102 is used to display the current fault diagnosis steps under the current fault type, as well as the standard data or standard graphics of this step, and the maintenance personnel can find out the cause of the fault by checking step by step according to the suggested steps.

Diagnosis process display area 103 is used to display the flow chart of the steps required by the current fault type, from which an overview of all steps of the current fault type, as well as the steps that have been executed and the steps that are currently running can be displayed.

The operation method display area 104 is to display the specific operation method of the current step. According to this embodiment, after the maintenance personnel selects the operation method prompt button 117 in the fault step display area 102 of FIG. wait.

The diagnosis result display area 105 displays the diagnosis result. When a fault cause is found during the diagnosis process, the fault cause and solution will be displayed in the diagnosis result display area, and it will be asked whether the problem has been solved. If so, the diagnosis will end, otherwise, the original step diagnosis will continue.

As shown in FIG. 4 , the diagnosis step display area 102 in the fault type operation interface 100 is used to display the current fault diagnosis step of the current fault type, as well as the standard data or standard graphics required for this step. Diagnosis step display area 102 includes: diagnosis step display box 112, current step correct value display box 113, start button 114, normal button 115, error button 116, operation method button 117, query fault code button 118, current step reference map display box 119 , the current step reference figure text box 120 and the diagnosis step text box 121 .

The current step display box 112 is used to display the current diagnosis step, and the system will gradually display each diagnosis step, and the maintenance personnel only need to operate according to the prompts.

The start button 114 is used to start the diagnosis. When the maintenance personnel enters the diagnosis step display interface 111, they can click on this button to perform fault diagnosis, and then this button becomes unavailable until the diagnosis is completed before continuing to use it.

Judging whether the value checked according to the current diagnosis step matches the standard value provided by the correct value display box 113 of the current step or the standard diagram provided by the reference diagram display box 119 of the current step, if it matches, click the normal button 115 to enter the next step of diagnosis , and at the same time, the diagnosis step flows to FIG. 50 to turn on the next light sequentially according to the original lighting direction. If the current lighting is vertical, then it is still vertical lighting;

The error button 116 is used to judge whether the value checked according to the current diagnostic step is consistent with the standard value given by the correct value display box 113 of the current step or the standard figure given by the reference figure display box 119 of the current step, if not, click this button Enter a more specific diagnosis, and at the same time, the diagnostic steps flow to FIG. 50 to change the original lighting sequence to light the next light. If the current lighting is vertical, then the horizontal lighting; if the current horizontal lighting is horizontal, then the vertical lighting.

The operation method button 117 is used to display a specific operation method. When the current diagnostic steps are displayed in the step display box 112, if the maintenance personnel need to check the specific operation method, they can click the operation method button 117, and the specific operation steps are displayed in the operation method display area 104, such as fuel injection How to disassemble the device, etc.

The fault code query button 118 is used to display the fault code query interface. When this button is clicked, the fault code query interface 121 will pop up, and the maintenance personnel can enter the fault code for query.

The correct value display box 113 of the current step is used to display the standard value of the inspection content of the current step, such as voltage value, etc. With this standard value, the maintenance personnel can judge whether the current diagnosis is normal.

The current step reference graph display box 119 is used to display the standard graph of the inspection content of the current step, such as the injector current waveform, etc. With this standard graph, it is helpful for maintenance personnel to judge whether the current diagnosis is normal. However, in the present invention, not every step has a reference graphic display, so in some diagnostic steps, no graphic will be displayed in the reference graphic display box 119 .

The current step reference figure text box 120, the current step correct value text box 121 and the diagnosis step text box 110 are used to display specific text.

As shown in Figure 5, the diagnostic step flow diagram 50 uses tree nodes and branches to represent diagnostic steps and associations, if the current diagnostic step is a more specific expansion of the previous diagnostic step, then the current step is displayed vertically to the previous step; if The current diagnostic step and the previous diagnostic step are in a parallel relationship, and the current step will continue to be displayed along the direction of the previous step; if all the steps in the current direction are executed, switch back to the beginning of the direction change according to the execution order or directly step, continue execution without changing the original direction. The leftmost vertical arrangement in Fig. 5 is the main operation steps of the current fault type, such as nodes 51, 53, 54, and the horizontal arrangement is the more detailed branch diagnosis steps of the current main step, such as node 56. If the branches can be subdivided into multiple diagnostic steps, they can also be vertically arranged in the branches, such as node 52, and so on, and each branch can be further subdivided into horizontal small branches, such as node 57.

In this embodiment, clicking the normal button 115 once will execute according to the current execution sequence. If the current execution is vertical, it will still be executed vertically, such as nodes 54 and 53; if it is currently executed horizontally, it will be executed horizontally, such as nodes 57 and 58. Click the wrong button once to change the execution sequence once. If the current execution is vertical, it will be executed horizontally, such as nodes 53 and 56; if it is currently executed horizontally, it will be executed vertically, such as nodes 56 and 52.

In this embodiment, the diagnostic execution is performed step by step in order. Which step is currently running will be displayed in a highlighted color (called lighting), and the steps that have been executed will be highlighted in another color. Executed steps are shown in gray. In this way, the maintenance personnel can clearly know the position of the current diagnosis step in the whole diagnosis process, which is convenient for the maintenance personnel to understand the whole diagnosis process.

In the actual operation, the operation steps can also be changed according to the needs. If some steps in the middle can be omitted, some steps can be skipped for execution, and the color of the skipped unexecuted steps is still gray.

If the current branch steps are all executed, you can follow the prompts or directly switch back to the original main step of this branch, and continue the execution of other main steps. If the execution of node 58 is completed, if the fault has not been resolved, it will return to the node 53 executions.

As shown in FIG. 6 is a fault code query interface 121 . When maintenance personnel find that there is a fault code, they can click the query fault code button 118, and this interface will appear. The fault code query interface 121 of Fig. 6 includes: a fault code 1 input area 122, a fault code 2 input area 123, a fault code meaning text box 124, a fault code meaning display area 125, a treatment measure text box 126, a treatment measure display area 127, Clear button 128, start button 129, DTC 3 input area 130, DTC 4 input area 131, DTC 4 text box 132, DTC 3 text box 133, DTC 2 text box 134, DTC 1 text box 135 and Exit button 136 .

DTC 1 input area 122, DTC 2 input area 123, DTC 3 input area 130 and DTC 4 input area 131 are used to input 4 DTCs respectively.

The fault code meaning text box 124 is used to prompt the following area to display the meaning of the fault code.

The fault code meaning display area 125 displays the meaning of each fault code. For example, when the fault code 1 is entered as 0001H, and then the start button 129 is clicked, the disconnection fault of the flywheel speed sensor is displayed here. If there are multiple fault codes input, the meaning of multiple fault codes will be displayed here, and the meaning of one fault code will be displayed in one line.

The action text box 126 is used to prompt the area below to display the action.

The treatment measures display area 127 displays the measures taken for each fault code, for example, when the fault code 1 is entered as 0001H, and then the start button 129 is clicked, the detection of the wiring of the flywheel speed sensor is displayed here. If there are multiple fault codes input, multiple fault code handling measures will be displayed here, and one fault code measure will be displayed in one line.

Clear button 128 is used to clear fault codes, fault meanings and handling measures. When this button is clicked, the contents of the 4 fault code input areas 122, 123, 130 and 131, fault code meaning display area 125 and treatment measure display area 127 are all cleared .

The start button 129 is used to start querying fault codes. When this button is clicked, the meaning of the fault code will be displayed in the fault code meaning display area 125 according to the contents of the four fault code input areas 122, 123, 130 and 131. The processing measures for each fault code are displayed in the display area 127 .

DTC 4 text box 132, DTC 3 text box 133, DTC 2 text box 134 and DTC 1 text box 135 are used to prompt the area on the right to input a DTC.

The exit button 136 is used to exit the fault code query interface 121 .

The method of fault code query is to input the fault codes read by the diagnostic equipment into the corresponding fault code input areas 122, 123, 130 and 131, and then click the start button 129, and the meaning of the fault code will be displayed in the fault code meaning display area 125 , the treatment measures for each fault code are displayed in the treatment measure display area 127, and then the maintenance personnel can perform maintenance according to the treatment measures.

As shown in Figure 7, it is the diagnosis result display area 105 in the fault type operation interface 100. During the diagnosis process, if a fault cause is found, the result will be displayed in this figure, and it will be asked whether the problem is solved. If so, the diagnosis will be terminated. , there may be other faults that need to be resolved, and the system will continue to diagnose.

Diagnosis result display area 105 comprises: fault cause display area 141, solution display area 142, no text box 143, no selection box 144, yes text box 145, yes selection box 146, problem solved text box 147, failure reason text box 148.

The failure cause display area 141 is used to display the cause of the failure, but not necessarily the final cause.

The solution display area 142 is used to display the solution, which is to propose a solution according to the cause of the failure.

"No" text box 143, "no" spin box 144, "yes" text box 145, "yes" selection box 146 and "problem solved" text box 147 form an interactive judgment together, if according to the solution display area 142 If the fault is solved, click the "Yes" selection box 146 to end the diagnosis; otherwise click the "No" selection box 144 to continue the next step of diagnosis.

As shown in FIG. 8 , a learning function interface 151 is provided. When other diagnostic methods or diagnostic steps need to be added to the entire system, the learning button 28 can be clicked to enter this interface.

Learning function interface 151 includes: fault type input box 152, diagnostic step input box 153, add button 154, end button 155, current step reference figure input box 156, current step reference figure text box 157, current step correct value input box 158, Current step correct value text box 159 , diagnosis step text box 160 and fault type text box 150 .

The failure type text box 150 and the failure type input box 152 are used to input the failure type, and the failure types include: failure to start, black smoke, white smoke, engine shaking, high fuel consumption, insufficient power and sudden flameout.

The diagnostic step text box 160 and the diagnostic step input box 153 are used to input specific diagnostic steps.

The current step correct value text box 159 and the current step correct value input box 158 are used to input the normal value or standard value of this step, such as the rail pressure value.

The current step reference image text box 157 and the current step reference image input box 156 are used to input the image of this step, such as the current current waveform.

The add button 154 is used to add the currently input fault type, diagnosis step, normal value or normal figure to the system, and automatically number it, adding it after the original diagnosis step. In addition, display nodes are also added in the diagnosis flow diagram, so that when the system runs to this added diagnosis step, the current node can also be highlighted in the diagnosis flow diagram.

After adding this diagnostic step, the system will clear the fault type input box 152, diagnostic step input box 153, current step correct value input box 158 and current step reference map input box 156, allowing maintenance personnel to continue to input other diagnostics step.

The end button 155 is used to end the input of the diagnosis step. When this button is clicked, the interface block diagram 151 is exited and the interface block diagram 20 is returned.

According to this embodiment, the entire diagnosis implementation process is: the maintenance personnel enters the interface block diagram 20 according to the fault type reflected by the user, clicks on the corresponding fault type, enters the interface block diagram 100, clicks the start button 114, and in the current step display frame 112, the The first diagnostic step is displayed, and the first lamp 55 in the diagnostic flow diagram is brightened at the same time, and the current normal value is displayed in the current step correct value display box 113. The reference figure text box 120 displays the corresponding figure. Now the maintenance personnel checks according to the diagnostic steps, if the check value is correct, then click the normal button 115, the system automatically displays the second diagnostic step in the current step display frame 112, and simultaneously the second vertical light 54 of the diagnostic flow diagram turns bright; If it is not correct, and the system has a further inspection, then a more subdivided diagnostic step is displayed in the current step display box 112, and the second horizontal light of the diagnostic flow diagram is brightened; The cause display area 141 displays the cause of the failure, and the solution display area 142 displays the solution. Follow this method until you find the cause of the failure.

When the failure cause display area 141 in the diagnosis result display area 105 displays the cause of the failure, and the solution display area 142 displays the solution, the maintenance personnel eliminates the fault according to the solution, and then judges. If the fault is solved, click "Yes" to select Block 146, end the diagnosis; otherwise, click "No" to select the block 144, and continue to the next step of diagnosis.

If the fault has not been eliminated until the last step of the diagnosis, the system will perform the diagnosis process again to prevent some intermediate steps from being incompletely diagnosed. If the problem is still not found, you can exit the system and perform manual diagnosis.

When the final diagnosis is completed, the missing diagnostic steps can be added to the system. At this time, the learning button 28 should be clicked on the fault type selection interface 20 to enter the function interface 151, and the specific diagnostic steps are input in the diagnostic step input box 153, the current step The correct value input box 158 inputs the normal value or standard value of this step; if there is a displayed figure in this step diagnosis step, then input the picture of this step in the current step reference figure input box 156, and click the add button 154 to complete this input . At this time, the system will add the currently input fault type, diagnosis step, normal value or normal map to the system, and automatically number it, append it after the original diagnosis step, and add a display node in the diagnosis display tree. At the same time, the system will clear the fault type input box 152, the diagnosis step input box 153, the current step correct value input box 158 and the current step reference map input box 156 contents.

If you need to continue to add steps, then continue to follow the above steps, if you do not need to add, then click the end button 155 to end the input of the diagnostic steps, exit the interface block diagram 151, and return to the interface block diagram 20.

The fault type operation interface 100 of the present invention can simultaneously display the fault type currently being processed, the current diagnosis step, the position of the current diagnosis in the entire diagnosis process, and the standard data or graphics used in the current step. In addition, the specific operation method of the current processing step is also provided on the fault type operation interface 100, which can be queried if required by the user. Moreover, an interactive dialog is provided on the interface to judge whether the current diagnosis has solved the fault problem. Therefore, through this operation interface, maintenance personnel can clearly understand the meaning of each operation step and its position in the entire diagnosis process. In this way, even maintenance personnel with relatively little experience can quickly diagnose the cause of the fault and solve practical problems at the same time. Also improve their own maintenance experience.

Using the present invention, in each step of performing diagnosis, the maintenance personnel can gradually diagnose the fault according to the normal value of the current step. Until all the steps are executed; if not met, more subdivided steps will be carried out for diagnosis.

In actual operation, the operation steps can also be changed according to needs. If some steps in the middle can be omitted, some steps can be skipped for execution. On the fault type operation interface 100, you can directly switch to the required steps, and at the same time, the diagnosis of this step Content and correct standard data or graphics are also updated at the same time.

For some faults of the engine, there will be a fault code to indicate the fault problem, but the fault code shows a series of numbers, and it is necessary to consult the manual to understand its meaning. Using the present invention, in the process of diagnosing, if you need to query the fault code, you can directly enter the fault code query interface 121, input the fault code at the corresponding position, and the meaning of the fault code and the solution to be taken can be directly displayed, avoiding I went to the maintenance personnel to check the meaning of the fault code one by one, which improved the work efficiency.

The present invention also has the function of learning. Because for each type of failure, the present invention includes as many failure situations and processing methods as possible. In most cases, the cause of the failure can be found by step-by-step diagnosis according to the operation steps, but if the failure cannot be found at the end Reason, the system will prompt to start the diagnosis from scratch, in order to prevent some intermediate steps from not being checked carefully. If the cause of the fault has not been found after 2 rounds of inspection, there may be unknown detection steps and the cause of the fault are not included in the fault diagnosis interface. At this time, it is necessary to ask experienced maintenance personnel to solve it manually, and the final diagnosis step can be entered In the system, the learning process is completed.

Claims (10)

1. Common rail system fault diagnosis system, characterized by including fault type selection interface (20), fault type operation interface (100), fault code query interface (121) and learning function interface (151), the fault type selection The interface (20) is used to display various common fault types of the engine. Select a fault type to enter the corresponding fault type operation interface (100); the fault type operation interface (100) is used to display various diagnostic steps and diagnostic procedures. Standard data or standard graphics, for different types of faults, there are corresponding special inspection procedures and comparison standards; the fault code query interface (121) is used to display the meaning and treatment measures of the current fault code; the learning function interface (151) is used to To add diagnostic steps to the system that were not included in the original system. 2. The common rail system fault diagnosis system according to claim 1, characterized in that: the fault type selection interface (20) includes a plurality of fault type buttons for selecting the fault type, and also includes a learning button for opening the learning The function interface (151) enters the learning mode; the fault type operation interface (100) includes: fault type display area (101), diagnosis step display area (102), diagnosis process display area (103), operation method display area (104 ) and the diagnosis result display area (105). 3. The common rail system fault diagnosis system according to claim 2, characterized in that: the fault type operation interface (100) can simultaneously display the fault type currently being processed, the current diagnosis steps, and the current diagnosis in the whole The position in the diagnosis process, as well as the standard data or graphics used in the current step, also provide the specific operation method of the current processing step; the diagnosis result is displayed in the diagnosis result display area (105), when a fault cause is found during the diagnosis process, All will display the cause of the failure and the solution in the diagnosis result display area (105), and ask whether the problem has been solved, if so, end the diagnosis, otherwise continue the original step diagnosis. 4. The common rail system fault diagnosis system according to claim 2, characterized in that: the fault step display area (102) is used to display the current fault diagnosis step under the current fault type, and the standard data or standard graphics of this step , including the current step display box (112), the current step correct value display box (113) and the current step reference figure text box (120); the diagnosis result display area (105) includes a fault cause display area (141) and solutions Display area (142); after clicking the "Start" button, the first diagnostic step is displayed in the current step display box (112), and the current normal value or standard value is displayed in the current step correct value display box (113), If there is a graphic displayed in the diagnostic step of this step, the corresponding graphic will be displayed in the current step reference graphic text box (120); the maintenance personnel will check according to the diagnostic step, if the checked value is correct, click the "Normal" button (115), and the system will automatically The second diagnostic step is displayed in the current step display box (112), if it is incorrect, click the "error" button (116), if the system has further inspection, it will be displayed in the current step display box (112) If there is no inspection step, the cause of the fault will be displayed in the fault cause display area (141), and the solution will be displayed in the solution display area (142); a standardized diagnostic process has been saved in the system. Carry out the above procedures in sequence until the cause of the fault is found. 5. The common rail system fault diagnosis system according to claim 2, characterized in that: the diagnostic process display area (103) is used to display the flow chart (50) of the diagnostic steps required for the current fault type, the figure An overview of all steps of the current fault type is displayed in , and different colors or styles are used to distinguish the steps that have been executed, the steps that are currently executed, and the steps that are not executed. 6. The common rail system fault diagnosis system according to claim 5, characterized in that: the diagnosis step flow diagram (50) uses tree nodes and branches to represent the diagnosis steps and associations, if the current diagnosis step is the last diagnosis step More specifically, the current step is displayed perpendicular to the previous step; if the current diagnostic step and the previous diagnostic step are in a parallel relationship, the current step will continue to be displayed along the direction of the previous step; After all the steps are executed, follow the execution order or directly switch back to the initial step where the direction is changed, and continue the execution without changing the original direction; the user can switch to the required step at will on the diagnosis step flow diagram (50). Diagnosis content and standard data or graphics are also updated in the fault step display area (102) at the same time. 7. The common rail system fault diagnosis system according to claim 6, characterized in that: click the "normal" button (115) once in the fault type operation interface (100), and in the diagnosis step flow diagram (50) , the next step node is displayed according to the current execution direction; click the "error" button (116) once, and the current execution direction is changed to display the next step node. 8. The common rail system fault diagnosis system according to claim 1, characterized in that: the fault code query interface (121) includes a fault code input box, a fault code meaning display area, and a treatment measure display area, and the fault code input Go to the fault code input area, display the fault code meaning in the fault code meaning display area, and display the treatment measures for each fault code in the treatment measure display area. 9. The common rail system fault diagnosis system according to claim 1, characterized in that: the learning function interface (151) includes text boxes for inputting fault types, diagnostic steps, and normal or standard values of these steps, and "Add" button to save the entered content to the system. 10. The common rail system fault diagnosis system according to claim 9, characterized in that: the learning function interface (151) further includes a current step reference picture input box for inputting a picture of the step.