CN112816228A

CN112816228A - EOL detection method of EMS and EMS offline detection method

Info

Publication number: CN112816228A
Application number: CN202110120524.4A
Authority: CN
Inventors: 杜浩; 鲁永山; 陈创; 苏波; 胡宁
Original assignee: Dongfeng Motor Group Co Ltd
Current assignee: Dongfeng Motor Group Co Ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-05-18

Abstract

The application discloses an EMS fault detection method in EOL and an EMS offline detection method, which relate to the field of vehicle detection, and the EOL detection method of the EMS comprises the following steps: reading a part number of the EMS, comparing the part number with a preset reference part number, reading current and historical fault codes of the EMS, reading current snapshot data and sending the current snapshot data to manual maintenance if a specified fault code is read, wherein the snapshot data comprises time of fault generation and current vehicle state data; if the fault code is not read or the specified fault code is not read, informing the EMS to clear the fault code, reading the current fault code of the EMS after the fault code is cleared, and if the current fault code of the EMS is not read, detecting the EOL to be qualified; if the data is read, sending manual maintenance; the designated fault code is the first P-series fault code associated with the engine exhaust system. The invention can detect the fault code in time and avoid the fault from flowing to the market.

Description

EOL detection method of EMS and EMS offline detection method

Technical Field

The application relates to the field of vehicle detection, in particular to an EMS fault detection method in EOL and an EMS offline detection method.

Background

The EOL detection is an abbreviation of End of line, refers to the End detection of a vehicle, and is used for the final detection before the vehicle is put into storage after production. And specially, tests such as fault diagnosis, functional verification and the like are carried out on the whole automobile and are used as the last detection procedure of automobile delivery customers.

After the whole vehicle is assembled and initialized, the EOL of the vehicle can be detected after the vehicle passes through a series of detections and dynamic road tests, wherein the EOL comprises the detection of an EMS (Engine Management System) of the vehicle, and the correct assembly of EMS hardware and no fault code of the vehicle are confirmed through the EOL detection result, so that the Engine System is ensured to flow to the market without faults.

The current detection process of the EOL to the EMS is as follows: checking part information → clearing fault code → reading fault code, aiming at clearing fault code generated in the manufacturing process under the premise of ensuring the assembly correctness, then reading the current fault of EMS, if the fault occurs, carrying out manual maintenance on the vehicle to remove the fault, and carrying out EOL detection again until the fault is confirmed to be qualified.

According to the implementation mode of the EOL detection, the fault codes in the manufacturing process are cleared, wherein part of fault codes (for example, faults of oxidation sensors) include historical fault codes and current fault codes, the fault codes are read after the fault codes are cleared, and the fault codes do not exist (because in an actual production line, it is generally defaulted that an engine does not have faults, so that a false fault possibly existing in the assembly process is erased firstly, then the fault codes are read), the system judges that the electrical inspection of the EMS is qualified, but the vehicle faults still exist, and when the next time a vehicle reaches a working condition generated by fault code diagnosis (for example, the oxidation sensors need to run for 5 minutes to complete the diagnosis), the fault codes are generated again, a host factory cannot detect the fault in real time, so that the fault flows to the market, and bad driving experience of the vehicle is caused or the anchoring fault is relatively serious, affecting the vehicle brand reputation. This type of fault code for an engine system poses significant challenges for existing EOL detection approaches.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an EMS fault detection method in EOL and an EMS offline detection method so as to solve the problem that fault codes cannot be detected in real time.

In order to achieve the above object, in one aspect, an EOL detection method of an EMS includes the steps of:

reading the part number of an engine management system EMS, comparing the part number with a preset reference part number, reading the current and historical fault codes of the EMS,

if the specified fault code is read, reading current snapshot data and sending the current snapshot data to manual maintenance, wherein the snapshot data comprises time of fault generation and current vehicle state data;

if the fault code is not read or the specified fault code is not read, informing the EMS to clear the fault code, reading the current fault code of the EMS after the fault code is cleared, and if the current fault code of the EMS is not read, detecting the EOL to be qualified; if the data is read, sending manual maintenance;

the designated fault code is the first P-series fault code associated with the engine exhaust system.

Preferably, the EOL detection preconditions are: and when the vehicle to be detected is in static parking, the engine is turned off, and the power supply is turned on.

Preferably, before reading the part number of the EMS, a handshake signal is sent to the EMS, and if the EMS responds affirmatively, a reading instruction for reading the part number is sent to the EMS to acquire the part number; and if the EMS does not have a positive response, sending manual overhaul.

Preferably, the part number of the engine management system EMS is read, if the read part number is inconsistent with the preset reference part number, an error is reported, and manual maintenance is sent.

Preferably, if the specified fault code is read, the current snapshot data is read through one or more instructions.

Preferably, when the EMS is notified to clear the fault code, if the fault code is not cleared, manual maintenance is sent.

Preferably, after the manual overhaul is completed, the EOL detection method of the EMS is performed again.

In another aspect, a method for detecting an EMS offline is provided, including:

after the whole vehicle is assembled and normally powered on, EMS is initialized;

sequentially carrying out tooth signal learning and OBD detection;

after the OBD detection is passed, carrying out a dynamic road test;

and after the dynamic road test, detecting by adopting the EOL detection method of any EMS, and warehousing the qualified vehicles by EOL detection.

Preferably, the method further comprises: and clearing the fault code of the EMS after the tooth information learning or the OBD detection.

Preferably, the EMS initialization comprises data flashing and anti-theft matching;

the dynamic time set by the dynamic road test is not less than 5 minutes.

The beneficial effect that technical scheme that this application provided brought includes:

according to the method, whether the specified fault code is read or not needs to be judged, if the specified fault code is read, the current snapshot data is read and sent to manual maintenance, compared with the existing EOL detection, fault repair can be carried out more timely, the fault code is detected timely, and the fault flow to the market is avoided.

After manual maintenance is completed each time, the EOL detection method of the EMS is carried out again, and after the fault code is cleared, the current fault code of the EMS is read again, so that the problem that part of fault codes in the EMS are deleted by mistake is solved.

In the EMS offline detection method, operations such as EMS initialization, tooth information learning, OBD detection and the like are completed before dynamic road test, fault codes of the EMS are cleared, conditions are created for subsequent EOL detection, the EMS detection is realized through the EOL detection method, the fault of a transmitter is effectively detected, and the fault is prevented from flowing to the market.

Drawings

FIG. 1 is a flowchart of an EMS fault detection method in EOL according to an embodiment of the present invention;

fig. 2 is a flowchart of an EMS offline detection method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The application mainly provides an EOL detection method of EMS, which detects the EMS through an EOL detection program and comprises the following steps:

reading the part number of the EMS, comparing the part number with a preset reference part number, and reading the current and historical fault codes of the EMS;

if the fault code is not read or the specified fault code is not read, informing the EMS to clear the fault code, reading the current fault code of the EMS after the fault code is cleared, and if the current fault code of the EMS is not read, detecting the EOL to be qualified; and if the detection result is read, sending manual maintenance, and carrying out the detection steps again after the manual maintenance.

The above-mentioned specified fault code is a P-series fault code whose first bit is, for example: P2A00 indicates that the front oxygen sensor is exiting the ready state, P0131 indicates that the front oxygen sensor is shorted to a low voltage; the fault codes are related to an engine exhaust system, and the self-diagnosis can be completed only by 5 minutes of dynamic road test so that the EMS can report the fault codes.

In the above steps, before reading the part number of the EMS, the EOL detection program sends a handshake signal to the EMS to establish a communication link, and if the EMS responds positively, sends a read instruction for reading the part number to the EMS, and then obtains the part number; and if the EMS does not respond positively, sending manual maintenance, and repeating the steps after the manual maintenance is finished.

And further, reading the part number of the EMS, reporting an error if the read part number is inconsistent with the preset reference part number, sending manual maintenance, and repeating the steps after the manual maintenance is finished.

Further, when reading the current snapshot data after reading the specified fault code (including the current fault code and the historical fault code), the snapshot data may need one instruction or multiple instructions to be read.

Specifically, the current fault code of the EMS is read after the fault code is cleared, if the current fault code of the EMS is not read, no fault code exists, the EOL detection is qualified, and the detected vehicle can be put in storage. And if the fault code is read, sending manual maintenance, and carrying out the detection steps again after the manual maintenance.

In the above scheme, after the part number of the EMS is compared with the preset reference part number consistently, the process of reading the fault code is added, including judging whether the read fault code is the specified fault code, and when the specified fault code is read, reading snapshot data and sending manual maintenance, so that manual detection intervention on the specified fault code is realized, and effective detection of the EMS fault is realized.

As shown in fig. 1, an embodiment of an EOL detection method of an EMS is provided, which is performed on the premise of vehicle state confirmation, provided that: the vehicle to be detected is stationary and parked, the engine is OFF (OFF gear), and the power is ON (ON gear). The specific steps of this example are as follows:

s501, scan a Vehicle VIN (Vehicle Identification Number), start an EOL detection procedure, and proceed to S502. The first step of the EOL detection method in which the vehicle VIN is scanned as the EMS may be completed by manual scanning.

S502, the EOL detection program sends a handshake signal to the EMS to establish a communication link, and then the process proceeds to S503.

S503, judging whether the EMS has a positive response by the EOL detection program, and if so, entering S505; if not, the process proceeds to S504.

And S504, carrying out manual maintenance, and returning to S501 after the manual maintenance is finished.

S505, the EOL detection program sends a part number reading instruction to the EMS, reads the part number through the part number reading instruction, and enters S506.

S506, comparing the read part number with a preset reference part number, judging whether the read part number is consistent with the preset reference part number or not, and if so, entering S507; if not, the process proceeds to S504.

S507, the EOL detection program sends a fault code reading instruction (19020C) to the EMS to read the fault code, the reading instruction (19020C) is used to read the current fault code and the historical fault code, and the process proceeds to S508.

S508, judging whether a fault code exists, if so, entering S511; if not, the process proceeds to S509.

S509, judging whether the fault code belongs to the specified fault code, and if so, entering S510; if not, S511 is entered.

And S510, sending a snapshot reading instruction (190501) by the EOL detection program to read the current snapshot data, and then turning to S504 to indicate manual overhaul. The snapshot data includes the time at which the fault occurred and data relating to the vehicle state at that time. The snapshot data reading function is to clarify time of fault generation and relevant data of the vehicle state at that time, and according to actual setting of the EMS, the snapshot data may be read by one snapshot reading instruction or may need multiple snapshot reading instructions. In this embodiment, a snapshot reading instruction (190501) is used as an example to indicate that manual maintenance is performed after the operation is shifted to S504.

S511, the EOL detection program sends a clear fault code instruction (FF) to the EMS for clearing the temporary fault code generated in the dynamic road test device, and the process proceeds to S512.

S512, judging whether the fault code cannot be cleared or not, if not, enabling the EMS to respond positively, and entering S513; if yes, the EMS responds negatively, which indicates that the fault code is not cleared, and then the process exits the flow and enters S504.

S513, the EOL detection program sends a current fault code reading instruction (190209) to the EMS for reading the current fault code.

S514, judging whether the current fault code does not exist, if so, indicating that the current fault code does not exist, and entering S515; if not, a fault code is indicated, and the process proceeds to S504.

And S515, the EOL of the detected vehicle is qualified and can be put in storage.

In the embodiment, a fault code reading instruction (19020C) is sent to read fault codes (including current fault codes and historical fault codes), specified fault codes are identified, and if the specified fault codes occur, a vehicle enters a repair station for manual maintenance; and if the vehicle does not have the specified fault code, the EOL detection program sends a fault code clearing instruction, the fault code is read after the fault code is cleared, the vehicle can enter the warehouse and enter the market after the fault code is confirmed to be absent, if the fault code is cleared unsuccessfully or the fault code is read, the vehicle enters a repair station and needs manual maintenance, and EOL detection is carried out after the repair is finished until the EOL is qualified.

The invention also provides an EMS offline detection method, which comprises the following processes:

and after the whole vehicle is assembled and the vehicle can be normally powered on, EMS initialization is carried out, wherein the EMS initialization comprises data flashing and anti-theft matching.

The learning of the tooth information and the detection of the OBD (On Board Diagnostics) are performed in sequence. Clearing the fault code which is not learned by the tooth signal, and confirming that the tooth learning is finished. The OBD is a detection system extended for automobile fault diagnosis, is national standard detection, and reads OBD information and reports the OBD information to the national environmental protection department.

And performing the dynamic road test after the OBD detection passes, wherein the dynamic time of the dynamic road test is not less than 5 minutes.

After the dynamic road test, the EOL detection method of the EMS is adopted for detection, and the qualified vehicles are warehoused through EOL detection.

Furthermore, after the above-mentioned tooth information learning or after the OBD detection, a step of clearing the fault code of the EMS may be added, so as to eliminate the fault code generated in the manufacturing process, such as network communication fault, failure of the EMS which is not matched for theft prevention, etc.

As shown in fig. 2, an embodiment of an EMS offline detection method is provided, which specifically includes the following steps:

and S1, EMS initialization including data flashing and anti-theft matching. The step is a key step for ensuring the normal work of the EMS and is used for ensuring the integrity of EMS data.

It is understood that the data flash implements flash of driving data, application data and parameter data of the controller, and data files in various formats can be supported, such as formats of S19, BIN, HEX, and the like. The anti-theft match can comprise a traditional key anti-theft match and a smart key anti-theft match, and can also comprise a keyless starting system.

And S2, learning the tooth signal. This step can eliminate the tooth information as the learned fault code. In the embodiment, after the completion of the learning of the gear information is confirmed, the fault code of the transmitter is cleared, and the fault codes generated in the manufacturing process, such as network communication faults, EMS anti-theft unmatched faults and the like, are eliminated.

It is to be understood that "gear information" means, with respect to gear information learning, communication of gear position information output from the transmission computer. The vehicle is provided with a crankshaft position sensor, the crankshaft position sensor collects a flywheel 58 tooth signal to judge the top dead center ignition time (reference signal) of a cylinder, and if the crankshaft position sensor is replaced, the reference is lost, and tooth information learning is required.

And S3, carrying out OBD detection. The step completes international standards for checking whether EMS has fault codes or not, reading OBD information and reporting the OBD information to national environmental protection departments.

It can be understood that OBD detection is a detection item of national standard, and if a fault indicator fault (including a circuit fault) exists in a vehicle, the fault indicator is activated, a communication fault exists between the vehicle and an OBD diagnostic apparatus, and a state of an instrument panel fault indicator is inconsistent with a state of a fault indicator recorded in an Electronic Control Unit (EUC), OBD detection is determined to be unqualified.

And S4, performing dynamic road test. The dynamic road test has the functions of enabling the engine to normally run, enabling all parts of the engine to normally work and enabling all parts to finish diagnosis, and the dynamic time is not less than 5 minutes according to setting.

And S5, EOL detection of EMS is carried out. And detecting according to the EOL detection method of the EMS, detecting whether the EMS has a fault code, and carrying out manual maintenance when the fault code exists, wherein only vehicles without the fault code can be put into a warehouse to enter the market.

Further, after the learning of the preamble is completed in step S3, the process of clearing the transmitter fault code may be performed after the OBD detection in step S4 is completed.

The technical characteristics of the process of the embodiment are that before the dynamic road test, the fault code generated in the manufacturing process of the vehicle to be tested is cleared, the interference of the fault code generated in the manufacturing process is eliminated for the subsequent EOL detection, and the diagnosis of each component is completed through the dynamic road test, so that conditions are created for the EOL detection.

In addition, in the above embodiment, the first bit of the designated fault code is a P-series fault code, which is related to the engine exhaust system, and it takes 5 minutes for the dynamic road test to complete the self-diagnosis so that the EMS reports the fault code.

The EOL detection in the above embodiment may be designed and developed for a whole vehicle, is an offline test at the whole vehicle level, is the last detection process before delivery of a vehicle to a customer, and is an indispensable test process for offline of the whole vehicle. EOL detects and can possess detection terminal, communicates through modes such as WIFI with the communication equipment of connecting the vehicle, realizes the information interaction, finally uploads the testing result to EOL server, can also realize printout.

Through the embodiment, fault codes of the whole vehicle engine system are screened, and some fault codes normally generated in the manufacturing process are removed, so that the interference of false faults on EOL detection is prevented, and the qualification rate and the accuracy of detection are effectively improved; real faults are intercepted, snapshot data are collected and sent to manual maintenance, faulty vehicles are prevented from flowing into the market, meanwhile, repair personnel can accurately repair the vehicles according to the collected data, and efficiency is improved.

The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and are intended to be within the scope of the invention.

Claims

1. An EOL detection method of EMS is characterized by comprising the following steps:

2. The EOL detection method of an EMS of claim 1, wherein the precondition of the EOL detection is: and when the vehicle to be detected is in static parking, the engine is turned off, and the power supply is turned on.

3. The method of claim 1, wherein before reading the part number of the EMS, the method further comprises sending a handshake signal to the EMS, and if the EMS responds positively, sending a read command to the EMS to read the part number to obtain the part number; and if the EMS does not have a positive response, sending manual overhaul.

4. An EOL detection method of EMS according to claim 1, wherein the part number of the EMS is read, if the read part number is inconsistent with a preset reference part number, an error is reported and manual repair is sent.

5. An EOL detection method for EMS according to claim 1, wherein if a specified fault code is read, the current snapshot data is read via one or more instructions.

6. An EOL detection method of an EMS of claim 1, wherein when notifying the EMS to clear the fault code, if the fault code is not cleared, then sending a manual service.

7. An EOL detection method for an EMS according to any of claims 1-6, wherein the EOL detection method for the EMS is re-performed after the manual overhaul is completed.

8. An EMS offline detection method is characterized by comprising the following steps:

sequentially carrying out tooth signal learning and OBD detection;

after the OBD detection is passed, carrying out a dynamic road test;

and after the dynamic road test, detecting by adopting the EOL detection method of the EMS according to any one of claims 1 to 6, and warehousing the vehicles qualified in the EOL detection.

9. The EMS offline detection method of claim 8, wherein the method further comprises: and clearing the fault code of the EMS after the tooth information learning or the OBD detection.

10. The EMS offline detection method according to claim 8, wherein the EMS initialization includes data flashing and anti-theft matching;

the dynamic time set by the dynamic road test is not less than 5 minutes.