Vehicle environmental calibration test method based on plateau environment in low temperature scenario

Abstract

The present invention discloses a vehicle environmental calibration test method in a low-temperature scenario based on a plateau environment, comprising: performing basic calibration on a test vehicle using calibration equipment, modifying the exhaust system of the calibrated test vehicle, real-time monitoring of the air-fuel ratio and temperature parameters of the modified test vehicle, performing dynamic testing on the modified test vehicle in a plateau low-temperature environment and recording test data, judging whether the test data is startup failure data based on the air-fuel ratio and temperature parameters, and if so, performing parameter optimization on the vehicle calibration data to obtain low-temperature test optimization data. The present invention proposes to add a low-temperature plateau calibration verification link during the vehicle development stage, so that the product meets the reliability requirements of various altitude and temperature scenarios, thereby solving the cold start problem in low-temperature environments in plateau areas. All temperature scenarios from the lowest temperature to the highest temperature in high-altitude areas are covered, thereby ensuring the reliable performance of the product in all scenarios in plateau areas.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle environmental calibration, and in particular relates to a vehicle environmental calibration test method based on a plateau environment in a low-temperature scenario. Background Art

[0002] Vehicle environmental calibration is crucial for improving vehicle performance, safety, and adaptability. By calibrating and optimizing vehicle systems and various indicators in different environments, the vehicle's accuracy and reliability are ensured under various driving conditions. Currently, major OEMs conduct three high-temperature (high-altitude, high-altitude, and high-cold) environmental calibration and reliability testing during the vehicle development phase. High-temperature environmental calibration primarily verifies the thermal management performance of the charging system and powertrain systems, including the power battery, motor, and motor controller, while also examining air conditioning and cooling performance. High-altitude environmental calibration primarily involves engine calibration, including altitude testing and correction, engine cold start, and drivability calibration. High-cold environmental calibration primarily verifies the thermal management performance of the charging system and powertrain systems, including the power battery, motor, and motor controller, while also examining heating performance. High-altitude calibration is often conducted in conjunction with high-temperature calibration. However, engine starting issues often occur in low-temperature environments (below -20°C) in plateau regions, which are difficult to detect during conventional high-altitude calibration tests due to the different environmental conditions. Summary of the Invention

[0003] To solve the above problems, the present invention provides a vehicle environmental calibration test method based on a plateau environment in a low-temperature scenario, so as to solve the problem that it is difficult to detect the cold start of the vehicle engine in a low-temperature environment in the plateau area using conventional plateau calibration tests.

[0004] A vehicle environmental calibration test method based on a plateau environment in a low-temperature scenario includes:

[0005] Use calibration equipment to perform basic calibration on the test vehicle;

[0006] Modify the exhaust system of the calibrated test vehicle;

[0007] Real-time monitoring of the air-fuel ratio and temperature parameters of modified test vehicles;

[0008] Conduct dynamic tests on modified test vehicles in a plateau and low-temperature environment and record test data;

[0009] Based on the air-fuel ratio and temperature parameters, it is determined whether the test data is start failure data. If so, the vehicle calibration data is parameter optimized to obtain low-temperature test optimization data.

[0010] According to a specific embodiment of the present invention, performing basic calibration on a test vehicle using a calibration device includes:

[0011] Calibration equipment is used to perform basic calibration on the engine of the test vehicle, including basic engine performance calibration, idle speed calibration and ignition timing calibration.

[0012] According to a specific embodiment of the present invention, modifying the exhaust system of the calibrated test vehicle includes:

[0013] The vehicle's exhaust system is modified according to routine calibration tests, and the modified locations include the exhaust manifold, turbine, front oxygen sensor, rear oxygen sensor, catalyst, GPF and front temperature sensor.

[0014] According to a specific embodiment of the present invention, the temperature parameters include the front oxygen temperature, the rear oxygen temperature, the front and rear and center temperatures of the pre-catalyst, the surface temperature at the bend of the exhaust system, the supercharger outlet temperature, the injector temperature, the inlet and outlet temperatures of the high-pressure oil pump, the injector temperature, and the GPF temperatures at the 1 / 6, 1 / 2 and 5 / 6 positions and the inlet and outlet temperatures.

[0015] According to a specific embodiment of the present invention, performing a dynamic test on a modified test vehicle in a plateau low-temperature environment and recording test data includes:

[0016] Select an area with an altitude of more than 5000m and a temperature below -20℃ to conduct dynamic tests on the test vehicle, and record various dynamic test data.

[0017] According to a specific embodiment of the present invention, the dynamic test includes:

[0018] Normal cold start at low temperature, lean cold start at low temperature, dew point and closed loop time check, start safety check, repeated start, fault mode check, idle torque pre-control and self-learning check, TCU torque compensation check, Creep check, braking ability check, fuel supply self-learning and oxygen sensor characteristic check, transient operating condition check, plateau self-learning check, main charge deviation check, boost control check, dump valve control check and electronic vacuum pump check.

[0019] According to a specific embodiment of the present invention, the dynamic test data includes engine water temperature data, intake air temperature data, and altitude data.

[0020] According to a specific embodiment of the present invention, whether the test data is start failure data is determined based on the air-fuel ratio and temperature parameters. If so, the vehicle calibration data is parameter optimized to obtain low-temperature test optimization data including:

[0021] Determine whether the test data meets the engine's low-temperature cold start specifications based on the air-fuel ratio and temperature parameters. If not, determine that the test data is start failure data.

[0022] If the data is startup failure, the vehicle calibration data is optimized to obtain low-temperature test optimization data.

[0023] According to a specific embodiment of the present invention, performing parameter optimization on vehicle calibration data to obtain low-temperature test optimization data includes:

[0024] The starting injection factor, starting ignition angle correction, starting air intake volume and altitude correction parameters in the vehicle calibration data are optimized through the ECU system, and dynamic testing is carried out based on the optimized vehicle calibration data to obtain low-temperature test optimization data.

[0025] According to a specific embodiment of the present invention, the low-temperature test optimization data meets the low-temperature cold start specification of the engine.

[0026] Compared with the existing technology, the vehicle environmental calibration test method based on a plateau environment in a low-temperature scenario provided by the present invention has the following advantages:

[0027] This invention addresses the cold start issue in low-temperature plateau environments by adding low-temperature and high-altitude calibration verification to the vehicle development phase. This ensures the product meets reliability requirements at all altitudes and temperatures, addressing cold start issues in low-temperature plateau environments. This covers the full range of high-altitude temperature scenarios, from the lowest to the highest, ensuring reliable performance in all plateau scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a flow chart of a vehicle environmental calibration test method based on a plateau environment in a low temperature scenario according to an embodiment of the present invention.

[0030] Figure 2 4 is a flow chart of a method for optimizing parameters of vehicle calibration data according to an embodiment of the present invention.

[0031] Figure 3 FIG. 1 is a diagram of the position of the exhaust system modification provided according to an embodiment of the present invention.

[0032] Figure 4 1 is a first test data waveform diagram corresponding to a startup failure provided according to an embodiment of the present invention.

[0033] Figure 54 is a second test data waveform diagram corresponding to a startup failure provided according to an embodiment of the present invention.

[0034] Figure 6 This is a diagram of an ECU system data optimization interface provided according to an embodiment of the present invention.

[0035] Figure 7 This is a waveform diagram of test data after data optimization and adjustment by the ECU system according to an embodiment of the present invention.

[0036] Figure 8 1 is a test data waveform diagram corresponding to a normal startup provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make those skilled in the art understand the concept and thought of the present invention more clearly, the present invention is described in detail below in conjunction with specific embodiment.It should be understood that the embodiment provided herein is only a part of all possible embodiments of the present invention.After reading the specification of the application, those skilled in the art have the ability to make improvements, transformations, or replacements to part or all of the following embodiments, and these improvements, transformations, or replacements are also included in the scope of protection claimed in the present invention.

[0038] In this document, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are merely used to distinguish different elements. In this document, the terms "one", "an" and other similar words are not intended to indicate that there is only one thing, but rather that the relevant description is only for one of the things, and the thing may have one or more. In this document, the terms "comprise", "include" and other similar words are intended to indicate logical relationships, and cannot be regarded as indicating relationships in spatial structure. For example, "A includes B" is intended to indicate that B logically belongs to A, and does not mean that B is spatially located inside A. In addition, the meanings of the terms "comprise", "include" and other similar words should be regarded as open, not closed. For example, "A includes B" is intended to indicate that B belongs to A, but B does not necessarily constitute the whole of A, and A may also include other elements such as C, D, and E.

[0039] In this document, the terms "embodiment," "this embodiment," "one embodiment," and "an embodiment" do not indicate that the description applies only to a specific embodiment, but rather indicate that the description may also apply to one or more other embodiments. Those skilled in the art should understand that any description of a particular embodiment herein may be substituted, combined, or otherwise combined with the description of one or more other embodiments. New embodiments resulting from such substitution, combination, or other combination are readily conceivable by those skilled in the art and fall within the scope of protection of this invention.

[0040] Example 1

[0041] Additional aspects and advantages of embodiments of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of embodiments of the present invention. Figures 1-8 The embodiment of the present invention provides a vehicle environmental calibration test method based on a plateau environment in a low temperature scenario, comprising:

[0042] S1: Use calibration equipment to perform basic calibration on the test vehicle.

[0043] S2: Modify the exhaust system of the calibrated test vehicle.

[0044] S3: Real-time monitoring of the air-fuel ratio and temperature parameters of the modified test vehicle.

[0045] S4: Conduct dynamic tests on the modified test vehicle in a plateau and low-temperature environment and record the test data.

[0046] S5: Determine whether the test data is start failure data based on the air-fuel ratio and temperature parameters. If yes, optimize the parameters of the vehicle calibration data to obtain low-temperature test optimization data.

[0047] Starting a vehicle in a low-temperature, high-altitude environment not only requires overcoming inherent plateau characteristics (such as low air density and oxygen content), but also resistance caused by the low temperature, such as thick engine and transmission oil. To ensure reliability for users in plateau areas, this invention added a "fourth-high" verification test during the development phase to cover the full range of temperature scenarios in high-altitude areas, from the lowest to the highest, thereby ensuring reliable performance in all scenarios in plateau areas.

[0048] Specifically, step S1 uses calibration equipment to perform basic calibration on the test vehicle, including:

[0049] Calibration equipment is used to perform basic calibration on the engine of the test vehicle, including basic engine performance calibration, idle speed calibration and ignition timing calibration.

[0050] Before performing basic engine calibration, select a fully functional test vehicle in a state close to production. Calibration equipment includes but is not limited to a computer, ECU (Electronic Control Unit), and ES582 (USB CANFD bus interface module). Basic engine calibration brings the vehicle's state close to production, providing foundational data for subsequent exhaust system modification tests.

[0051] Specifically, step S2 of modifying the exhaust system of the calibrated test vehicle includes:

[0052] Modify and install the vehicle's exhaust system according to the conventional calibration test, such as Figure 3 As shown, the modified locations include the exhaust manifold, turbine, front oxygen sensor, rear oxygen sensor, catalyst, GPF (Gasoline Particulate Filter), and front temperature sensor. This embodiment of the present invention modifies the vehicle's exhaust system based on vehicle testing requirements to ensure its sealing and reliability.

[0053] Specifically, step S3 monitors the air-fuel ratio and temperature parameters of the modified test vehicle in real time. The air-fuel ratio is a crucial parameter for vehicle engine operation, significantly impacting exhaust emissions, engine power, and economy. Temperature parameters include front oxygen temperature, rear oxygen temperature, pre-catalyst front and rear and center temperatures, surface temperatures at exhaust system bends, supercharger outlet temperature, injector temperature, high-pressure oil pump inlet and outlet temperatures, injector temperature, and GPF temperatures at the 1 / 6, 1 / 2, and 5 / 6 positions and inlet and outlet temperatures. By monitoring the air-fuel ratio, the engine is ensured to achieve the optimal mixture ratio under different operating conditions, thereby improving engine power output, reducing fuel consumption, and reducing exhaust emissions. By monitoring and collecting temperature parameters, temperature monitoring of the engine exhaust system of the modified test vehicle is achieved.

[0054] Specifically, step S4 of performing a dynamic test on the modified test vehicle in a plateau low-temperature environment and recording the test data includes:

[0055] Dynamic testing of the test vehicle is performed in an area with an altitude of 5000m or higher and a temperature below -20°C, and various dynamic test data are recorded. The test area selected in this embodiment of the present invention has an ambient temperature close to the local annual minimum temperature. Within the test area, the vehicle can be stationary or undergo dynamic testing throughout the day. During dynamic testing, changes in engine water temperature, intake air temperature, and other parameters, as well as changes in altitude, are monitored and recorded. The engine water temperature is required to be at or near the local minimum temperature.

[0056] Dynamic testing includes: normal cold start at low temperatures, cold start with reduced lean at low temperatures, dew point and closed-loop time checks, start safety checks, repeated starts, fault mode checks, idle torque pre-control and auto-learning checks, TCU torque compensation checks, creep checks, braking capability checks, fuel supply auto-learning and oxygen sensor characteristic checks, transient operating conditions checks, plateau auto-learning checks, main charge deviation checks, boost control checks, dump valve control checks, and electronic vacuum pump checks. All OEMs perform these tests in accordance with their company standards. Dynamic test data includes engine water temperature, intake air temperature, and altitude data.

[0057] Based on the original three-high (high temperature, plateau, and extreme cold) environmental calibration and reliability testing, the present invention adds a low-temperature and plateau calibration verification link, that is, an area with an altitude of more than 5000m and a temperature below -20°C is selected to conduct dynamic testing on the test vehicle, so that the vehicle can meet the reliability requirements of use in scenarios at various altitudes and temperatures.

[0058] Specifically, step S5 determines whether the test data is start failure data based on the air-fuel ratio and temperature parameters. If so, the vehicle calibration data is parameter optimized to obtain low-temperature test optimization data including:

[0059] S51: Determine whether the test data meets the low-temperature cold start specification of the engine based on the air-fuel ratio and temperature parameters. If not, determine that the test data is start failure data.

[0060] S52: If the data is startup failure, optimize the parameters of the vehicle calibration data to obtain low-temperature test optimization data. Specifically including:

[0061] The ECU system optimizes the starting injection factor, starting ignition angle correction, starting air volume, and altitude correction parameters in the vehicle calibration data. Dynamic testing is then performed based on the optimized vehicle calibration data to generate optimized low-temperature test data. After multiple rounds of parameter optimization, testing is terminated until the optimized low-temperature test data meets the engine's cold start specifications.

[0062] In a specific embodiment of the present invention, a mountainous area at an altitude of 5103 meters is selected for dynamic testing. Figure 4 and Figure 5 As shown in the figure, the recorded test data is: engine water temperature is 3 degrees, starting time is 5.5s, and engine maximum speed is 670. Under this test condition, the engine did not start successfully. Therefore, the ECU system is used to optimize the parameters of the vehicle calibration data, such as Figure 6-Figure 8 As shown, some data are optimized and adjusted through the ECU system. When fho=0.55, the engine water temperature is -17 degrees, the engine starts successfully in one time, and the starting time is 3s.

[0063] In summary, the vehicle environmental calibration test method proposed in the present invention based on a plateau environment in a low-temperature scenario has the following advantages:

[0064] This invention addresses the cold start issue in low-temperature plateau environments by adding low-temperature and high-altitude calibration verification to the vehicle development phase. This ensures the product meets reliability requirements at all altitudes and temperatures, addressing cold start issues in low-temperature plateau environments. This covers the full range of high-altitude temperature scenarios, from the lowest to the highest, ensuring reliable performance in all plateau scenarios.

[0065] The concepts, principles, and ideas of the present invention are described in detail above in conjunction with specific implementation methods (including embodiments and examples). Those skilled in the art should understand that the implementation methods of the present invention are not limited to the forms given above. After reading this application document, those skilled in the art can make any possible improvements, replacements, and equivalent forms to the steps, methods, systems, and components in the above-mentioned implementation methods. These improvements, replacements, and equivalent forms should be deemed to fall within the scope of the present invention, and the scope of protection of the present invention shall be subject only to the claims.

Claims

1. A vehicle environmental calibration test method based on a plateau environment in a low temperature scenario, characterized in that: include: Use calibration equipment to perform basic calibration on the test vehicle; Modify the exhaust system of the calibrated test vehicle; Real-time monitoring of the air-fuel ratio and temperature parameters of modified test vehicles; Conduct dynamic tests on modified test vehicles in a plateau and low-temperature environment and record test data; Based on the air-fuel ratio and temperature parameters, it is determined whether the test data is start failure data. If so, the vehicle calibration data is parameter optimized to obtain low-temperature test optimization data.

2. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 1 is characterized in that: The basic calibration of the test vehicle using the calibration equipment includes: Calibration equipment is used to perform basic calibration on the engine of the test vehicle, including basic engine performance calibration, idle speed calibration and ignition timing calibration.

3. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 2 is characterized in that: The modification of the exhaust system of the calibrated test vehicle includes: The vehicle's exhaust system is modified according to routine calibration tests, and the modified locations include the exhaust manifold, turbine, front oxygen sensor, rear oxygen sensor, catalyst, GPF and front temperature sensor.

4. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 3 is characterized in that: The temperature parameters include front oxygen temperature, rear oxygen temperature, front and rear and center temperatures of the pre-catalyst, surface temperature at the bend of the exhaust system, supercharger outlet temperature, injector temperature, high-pressure oil pump inlet and outlet position temperatures, injector temperature, and GPF temperatures at 1 / 6, 1 / 2 and 5 / 6 positions and inlet and outlet position temperatures.

5. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 4 is characterized in that: The dynamic testing of the modified test vehicle in a plateau low-temperature environment and recording of test data include: Select an area with an altitude of more than 5000m and a temperature below -20℃ to conduct dynamic tests on the test vehicle, and record various dynamic test data.

6. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 5 is characterized in that: The dynamic test includes: Normal cold start at low temperature, lean cold start at low temperature, dew point and closed loop time check, start safety check, repeated start, fault mode check, idle torque pre-control and self-learning check, TCU torque compensation check, Creep check, braking ability check, fuel supply self-learning and oxygen sensor characteristic check, transient operating condition check, plateau self-learning check, main charge deviation check, boost control check, dump valve control check and electronic vacuum pump check.

7. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 5 is characterized in that: The dynamic test data includes engine water temperature data, intake air temperature data and altitude data.

8. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 7 is characterized in that: The determining whether the test data is start failure data based on the air-fuel ratio and temperature parameters, and if so, performing parameter optimization on the vehicle calibration data to obtain low-temperature test optimization data includes: determining whether the test data meets a low-temperature cold start specification of the engine based on the air-fuel ratio and the temperature parameter, and if not, determining that the test data is start failure data; If the data is startup failure, the vehicle calibration data is optimized to obtain low-temperature test optimization data.

9. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 8, characterized in that: Optimizing the parameters of the vehicle calibration data to obtain low-temperature test optimization data includes: The starting injection factor, starting ignition angle correction, starting air intake volume and altitude correction parameters in the vehicle calibration data are optimized through the ECU system, and dynamic testing is carried out based on the optimized vehicle calibration data to obtain low-temperature test optimization data.

10. The vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to claim 9, characterized in that: The low temperature test optimization data meets the low temperature cold start specification of the engine.

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