Engine delivery hot test detection method
By using message control of speed and ECU self-identification of faults before the engine leaves the factory, combined with the UDS protocol and dbc file communication mode, the problem of engine fault diagnosis before leaving the factory is solved, efficient fault identification and containment is achieved, hot test conditions are optimized, production costs are reduced and production efficiency is improved.
Patent Information
- Application Number
- CN202510852346.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-24
- Publication Date
- 2025-09-09
AI Technical Summary
Existing technologies are unable to effectively diagnose whether there are faults in the various electronic injection components before the engine leaves the factory, resulting in some components being out of control when leaving the factory, which may cause after-sales quality problems and economic losses.
Messages are used to control the speed, ECU self-identify faults and monitor key engine operating parameters. Alarms are added through the hot test bench. CAN communication between the ECU and the test bench is achieved by combining the UDS protocol and dbc files. Key parameters are recorded and fault diagnosis is performed to ensure that all electronic component and line faults are contained within the factory.
It has achieved accurate identification and containment of engine failures, reduced the zero-kilometer failure rate, optimized hot test conditions, saved gasoline consumption, and improved production efficiency and capacity.
Smart Images
Figure CN120609575A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of engine testing, in particular to a method for detecting engine factory hot testing. Background Art
[0002] Engine hot testing is an important method for testing engine quality and diagnosing engine faults, and is also a crucial step in engine development. During the engine development process, a large number of hot running-in tests are required to test various engine performance indicators, thereby continuously improving the engine design. Performance testing is also required before the engine leaves the factory or is installed on the vehicle to prevent defective engines from entering the market. In the past, most car manufacturers only conducted "three leaks and abnormal noise" inspections for factory hot testing. They were unable to directly determine whether the various electronic injection components were faulty, resulting in some engine components being out of control when leaving the factory. This may cause after-sales quality problems, and then lead to economic losses caused by quality problems. Therefore, it is particularly important to improve the hot test test conditions, test functions, and improve the diagnostic functions of various components. Summary of the Invention
[0003] In order to address the shortcomings of the background technology, the present invention provides an engine factory hot test detection method, which uses messages to control the speed, ECU self-identifies faults, and adds key engine operation parameters to the hot test bench to increase alarm monitoring of the engine status, providing a comprehensive and multi-angle factory hot test method for the engine, making quality control more accurate and convincing.
[0004] To achieve the above object, the present invention adopts the following technical solution: a method for detecting an engine factory hot test, comprising the following steps: Step 1: Mount the engine on a hot test test bench and confirm the hot test conditions and monitoring parameters that need to be added to the test bench for limit alarms as required. The hot test conditions include the engine operating speed and the operating time at each speed. Step 2: Select a speed control mode based on stability. The hot test bench communicates with the ECU, simulating the hot test bench as a VCU. Speed requests are sent to the ECU to control the speed to the corresponding operating condition, and the speed fluctuation range in the steady-state operating condition is controlled within ±50 rpm. Step 3: Resolve ECU communication parameter issues, read fault codes through the UDS protocol, use dbc files to implement CAN communication between the ECU and the hot test test bench, record key parameters during the hot test, name the files according to the engine number, and store them in a cloud folder; Step 4: Confirm that the ECU self-diagnosis function is fully enabled and consistent with the vehicle data settings, including circuit diagnosis and electronic component functional diagnosis. Test the data function by faulty parts or artificially creating faults to ensure that all electronic component and circuit faults on the engine are contained within the factory. Step 5: Promote to workshop production use. If the engine speed fluctuation meets the requirements, no fault code is reported, and all key parameters meet the test requirements during the hot test, the engine is judged to have passed the hot test and allowed to leave the factory. Otherwise, the engine hot test is judged to be abnormal and must be repaired and qualified.
[0005] Furthermore, the engine speed changes under no-load conditions, and during the hot test, it is confirmed that there is no sticking through the action of the phaser.
[0006] Furthermore, in step three, the key parameters of the hot test process are recorded and the files are named according to the engine number and stored in a cloud folder.
[0007] Furthermore, the engine operating speed in step 1 includes idle speed, 1500 rpm, 2000 rpm and 2500 rpm.
[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts INCA key parameter monitoring and ECU self-diagnosis to jointly identify engine faults, provides a more effective method for factory engine fault containment, makes the results more accurate and convincing, and records various parameters during the hot test process, which can effectively discover various engine faults caused by component quality and assembly process, and effectively reduce the engine zero-kilometer failure rate through troubleshooting; diagnoses and records fault codes on the basis of the traditional "three leaks and abnormal noises", and contains possible quality problems to the maximum extent. It can also store a large amount of data during the retrospective hot test process, and overcome various possible faults through repeated testing; adopts a communication mode combining UDS and DBC, which can not only stably control the hot test conditions, but also take into account the fault diagnosis function; saves gasoline consumption during the hot test process by optimizing the hot test conditions, helps to reduce production costs, speed up production rhythm, and increase production capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a flow chart of the detection method of the present invention. DETAILED DESCRIPTION
[0010] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0011] like Figure 1 As shown, a method for detecting an engine factory hot test includes the following steps: Step 1: Mount the engine on the hot test test bench, and confirm the hot test conditions and the monitoring parameters that need to be added to the test bench for limit alarms as required. The hot test conditions include the engine operating speed (idle, 1500rpm, 2000rpm, 2500rpm, etc.) and the operating time at each speed. Due to the speed changes when the engine is no-load, the phaser needs to be activated during the hot test to confirm that no sticking occurs.
[0012] Step 2: Select the appropriate speed control mode based on stability. This involves communicating with the ECU via the hot-test test bench, simulating the test bench's VCU functionality. The hot-test test bench sends speed requests to the ECU, controlling the speed to the appropriate operating speed. Because the hot-test test bench is unloaded, calibration data is debugged to limit the steady-state speed fluctuation to within ±50 rpm. This ensures that any engine speed fluctuations caused by abnormal conditions such as air leaks can be quickly identified.
[0013] Step three, solve the communication problem. The ECU communication parameters are divided into two items: key parameters of engine operation in the ECU and fault codes. The fault code can be read through the UDS protocol. The hot test test bench sends a request to the ECU to read the fault code message. The ECU returns the message and parses it according to the diagnostic protocol to obtain the corresponding fault code. As for the key parameters of engine operation, most of the key parameters of traditional engines are used for internal calculation and processing in the ECU and are not sent externally. Only some key parameters related to the whole vehicle are sent to the VCU via CAN. However, according to the parameter table required by the hot test file, most of the key parameters cannot be read directly from the ECU. The present invention chooses to realize CAN communication between the ECU and the hot test test bench through the dbc file, and at the same time records the key parameters during the hot test, names the files according to the corresponding engine numbers, and stores them in the cloud folder for easy retrospective query at any time.
[0014] Step 4. After completing the above steps, it is also necessary to confirm that the ECU's self-diagnostics are fully enabled and consistent with the vehicle's data settings. This includes circuit diagnostics and functional diagnostics of electronic components. This can be tested by testing faulty components or artificially creating faults. During the hot test, all electronic components must be connected to the wiring harness. Diagnostic codes can be generated when a problem occurs. Simple wiring harness continuity faults can be detected with 100% certainty, while functional faults of electronic components are detected by diagnostic codes. Wiring harness continuity faults are simulated using a breadboard. Connect the breadboard in series between the wiring harness and the ECU. Disconnect each electronic component pin according to the pinout in the wiring harness schematic. Observe whether the ECU can then generate a normal diagnostic code. If the corresponding fault code is not generated, verify that the corresponding fault diagnostics are enabled. If the diagnostics are enabled and the code is still not generated, investigate other diagnostic conditions. For example, the speed sensor signal pin must be running before the engine can be diagnosed. This ensures that all electronic component and wiring faults on the engine are contained within the factory.
[0015] Step 5: Promote to workshop production use. If the engine speed fluctuation meets the requirements, no fault code is reported, and all key parameters meet the test requirements during the hot test, the engine is judged to have passed the hot test and is allowed to leave the factory; if any of the above conditions are not met, that is, the engine speed fluctuation is abnormal, there is a fault code reported, or any key parameter does not meet the test requirements, the engine hot test is judged to be abnormal and needs to be repaired until the hot test is passed before it is allowed to leave the factory.
[0016] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other configurations without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations coming within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0017] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A method for detecting engine factory hot test, characterized by: The following steps are involved: Step 1: Mount the engine on a hot test test bench and confirm the hot test conditions and monitoring parameters that need to be added to the test bench for limit alarms as required. The hot test conditions include the engine operating speed and the operating time at each speed. Step 2: Select a speed control mode based on stability. The hot test bench communicates with the ECU, simulating the hot test bench as a VCU. Speed requests are sent to the ECU to control the speed to the corresponding operating condition, and the speed fluctuation range in the steady-state operating condition is controlled within ±50 rpm. Step 3: Solve the ECU communication parameter problem, read the fault code through the UDS protocol, and use the dbc file to realize the CAN communication between the ECU and the hot test test bench; Step 4: Confirm that the ECU self-diagnosis function is fully enabled and consistent with the vehicle data settings, including circuit diagnosis and electronic component functional diagnosis. Test the data function by faulty parts or artificially creating faults to ensure that all electronic component and circuit faults on the engine are contained within the factory. Step 5: Promote to workshop production use. If the engine speed fluctuation meets the requirements, no fault code is reported, and all key parameters meet the test requirements during the hot test, the engine is judged to have passed the hot test and allowed to leave the factory. Otherwise, the engine hot test is judged to be abnormal and must be repaired and qualified.
2. The engine factory hot test detection method according to claim 1, characterized in that: The engine speed changes are under no-load conditions, and during the hot test, the phaser action is used to confirm that there is no sticking.
3. The engine factory hot test detection method according to claim 1 or 2, characterized in that: In step three, the key parameters of the hot test process are recorded and the files are named according to the engine number and stored in a cloud folder.
4. The engine factory hot test detection method according to claim 1, characterized in that: In step 1, the engine operating speed includes idle speed, 1500 rpm, 2000 rpm and 2500 rpm.