Vehicle environment calibration test method based on plateau environment in low-temperature scene

Abstract

The invention discloses a vehicle environment calibration test method based on a plateau environment in a low-temperature scene, and the method comprises the steps: carrying out the basic calibration of a test vehicle through calibration equipment, modifying the exhaust system of the calibrated test vehicle, monitoring the air-fuel ratio and temperature parameters of the modified test vehicle in real time, and carrying out the calibration of the test vehicle. And dynamically testing the modified test vehicle in the plateau low-temperature environment, recording test data, judging whether the test data is starting failure data or not based on the air-fuel ratio and the temperature parameter, and if so, performing parameter optimization on the vehicle calibration data to obtain low-temperature test optimization data. The low-temperature plateau calibration verification link is added in the whole vehicle development stage, so that the product meets the use reliability of scenes at all altitudes and all temperatures, and the cold start problem in the low-temperature environment in the plateau area is solved. And full-temperature scene coverage from the lowest temperature to the highest temperature in the high-altitude area is carried out, so that the reliability of the product in the full scene in the plateau area is ensured.

Description

Technical Field

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

[0002] The environmental calibration of the vehicle is crucial to improving the performance, safety and adaptability of the vehicle. By calibrating and optimizing the vehicle's systems and various indicators in different environments, the accuracy and reliability of the vehicle under various driving conditions can be ensured. At present, major OEMs will conduct three high (high temperature, plateau, and high cold) environmental calibration and reliability tests on the vehicle during the vehicle development stage. The high temperature environmental calibration mainly verifies the thermal management performance of the charging system and power systems such as power batteries, motors and motor controllers, and examines the air conditioning refrigeration performance. Plateau environmental calibration is mainly the calibration of the engine, including detection and correction at different altitudes, engine cold start, driving performance calibration, etc. The high cold environmental calibration mainly verifies the thermal management performance of the charging system and power systems such as power batteries, motors and motor controllers, and examines the warm air effect. Among them, plateau calibration is mostly carried out in conjunction with high temperature calibration. However, in the low temperature environment of the plateau area (below -20°C), some problems are often found when the engine starts, and in the conventional plateau calibration test, due to different environments, it is difficult to find related problems. 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 of cold start of a vehicle engine in a low temperature environment in a plateau area which is difficult to detect using conventional plateau calibration tests.

[0004] A vehicle environment calibration test method based on a plateau environment in a low temperature scenario, comprising:

[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 the modified test vehicle;

[0008] Conduct dynamic tests on modified test vehicles in a plateau 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, using a calibration device to perform basic calibration on a test vehicle includes:

[0011] The 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 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 position temperatures at 1 / 6, 1 / 2 and 5 / 6 and inlet and outlet positions.

[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, cold start with reduced leanness 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, transition 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 yes, the vehicle calibration data is parameter optimized to obtain low temperature test optimization data including:

[0021] Based on the air-fuel ratio and temperature parameters, determine whether the test data meets the low-temperature cold start specification of the engine. If not, determine that the test data is start failure data;

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

[0023] According to a specific embodiment of the present invention, the vehicle calibration data is parameter optimized to obtain low temperature test optimization data including:

[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 prior art, the vehicle environment calibration test method based on a plateau environment in a low temperature scenario provided by the present invention has the following advantages:

[0027] The present invention proposes to add a low-temperature plateau calibration verification link during the vehicle development stage, so that the product can meet the reliability of use in scenarios at various altitudes and temperatures, and solves the cold start problem in low-temperature environments in plateau areas. The full temperature scenario from the lowest temperature to the highest temperature in high-altitude areas is covered, thereby ensuring the reliable performance of the product in all scenarios in plateau areas. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 It is a flow chart of a vehicle environment calibration test method based on a plateau environment in a low temperature scenario according to an embodiment of the present invention.

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

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

[0032] Figure 4 4 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 It is a test data waveform diagram 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 embodiments that the present invention may have.Those skilled in the art, after reading the specification of the application, have the ability to make improvements, transformations, or replacements to part or the whole of the following embodiments, and these improvements, transformations, or replacements are also included in the scope of the present invention.

[0038] In this article, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are only used to distinguish different elements. In this article, the terms "one", "an" and other similar words are not intended to indicate that there is only one thing, but to indicate that the relevant description is only for one of the things, and the thing may have one or more. In this article, the terms "comprise", "include" and other similar words are intended to indicate logical mutual relations, and cannot be regarded as indicating spatial structural relations. For example, "A includes B" is intended to indicate that B belongs to A logically, but does not mean that B is located inside A in space. In addition, the meanings of the terms "comprise", "include" and other similar words should be regarded as open, rather than 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 mean that the relevant description is only applicable to a specific embodiment, but rather that the description may also be applicable to one or more other embodiments. Those skilled in the art should understand that in this document, any description of a certain embodiment can be replaced, combined, or combined in other ways with the relevant descriptions in one or more other embodiments, and the new embodiments generated by the replacement, combination, or combination in other ways are easily conceivable by those skilled in the art and fall within the scope of protection of the present invention.

[0040] Example 1

[0041] Additional aspects and advantages of embodiments of the present invention will be described in part in the following description, and will become apparent from the following description, or will be learned through practice of embodiments of the present invention. Figure 1-Figure 8 The embodiment of the present invention provides a vehicle environment 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 vehicles 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 plateau environment not only needs to overcome the original plateau characteristics (such as low air density, low oxygen content, etc.), but also needs to overcome resistance such as oil viscosity and transmission oil viscosity caused by low temperature. In order to ensure the reliability of users in plateau areas, the present invention adds a "fourth high" verification test link during the development stage to cover the full temperature scene from the lowest temperature to the highest temperature in high-altitude areas, thereby ensuring the product's 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] The 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 basic calibration of the vehicle engine, first select a test vehicle with intact functions and a vehicle status close to the mass production status for calibration. The calibration equipment includes but is not limited to computers, ECU (electronic control unit), ES582 (USB CANFD bus interface module), etc. By performing basic calibration on the vehicle engine, the vehicle status is close to the mass production status, providing basic 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 positions include the exhaust manifold, turbine, front oxygen sensor, rear oxygen sensor, catalyst, GPF (Gasoline Particulate Filter) and front temperature sensor. The embodiment of the present invention modifies the exhaust system of the vehicle according to the test requirements of the vehicle to ensure the sealing and reliability of the exhaust system.

[0053] Specifically, step S3 monitors the air-fuel ratio and temperature parameters of the modified test vehicle in real time, wherein the air-fuel ratio is an important parameter for the operation of the automobile engine, which has a great influence on the exhaust emission, the power and economy of the engine, and 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 outlet temperature of the supercharger, the injector temperature, the inlet and outlet temperature of the high-pressure oil pump, the injector temperature, and the GPF position temperature at 1 / 6, 1 / 2 and 5 / 6 and the inlet and outlet temperature. By monitoring the air-fuel ratio, it is ensured that the engine obtains the best mixed gas ratio under different working conditions, thereby improving the power output of the engine, and can reduce fuel consumption and reduce exhaust emissions. By monitoring and collecting temperature parameters, the temperature monitoring of the engine exhaust system of the modified test vehicle can be realized.

[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] A dynamic test is performed on the test vehicle in an area with an altitude of 5000m or above and a temperature below -20°C, and various dynamic test data are recorded. The test area selected in the embodiment of the present invention has an ambient temperature close to the local annual minimum temperature. In the test area, the vehicle can be stationary or dynamically tested all day. During the dynamic test, the changes in data such as the engine water temperature and the intake air temperature, as well as the changes in the altitude, are monitored and recorded. The engine water temperature is required to reach or be close to the local minimum temperature.

[0056] Among them, dynamic tests include: normal cold start at low temperature, cold start with reduced dilution 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, transition condition check, plateau self-learning check, main charge deviation check, boost control check, drain valve control check and electronic vacuum pump check. All the above tests are carried out by all OEMs in accordance with the enterprise standards. Dynamic test data includes engine water temperature data, intake air temperature data and altitude data.

[0057] Based on the original three-high (high temperature, plateau, and severe cold) environmental calibration and reliability tests, the present invention adds a low-temperature 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 a dynamic test 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 yes, the vehicle calibration data is optimized to obtain low temperature test optimization data including:

[0059] S51: judging whether the test data meets the low-temperature cold start specification of the engine based on the air-fuel ratio and the temperature parameters; if not, judging the test data as start failure data.

[0060] S52: If the data is startup failure data, 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 intake volume and altitude correction parameters in the vehicle calibration data, and performs dynamic testing based on the optimized vehicle calibration data to obtain low-temperature test optimization data. After multiple parameter optimizations, the test is stopped until the low-temperature test optimization data meets the engine low-temperature cold start specification.

[0062] In a specific embodiment of the present invention, a mountain 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 at one time, and the starting time is 3s.

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

[0064] The present invention proposes to add a low-temperature plateau calibration verification link during the vehicle development stage, so that the product can meet the reliability of use in scenarios at various altitudes and temperatures, and solves the cold start problem in low-temperature environments in plateau areas. The full temperature scenario from the lowest temperature to the highest temperature in high-altitude areas is covered, thereby ensuring the reliable performance of the product in all scenarios in plateau areas.

[0065] The above describes in detail the concepts, principles and ideas of the present invention 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, substitutions and equivalent forms to the steps, methods, systems and components in the above implementation methods. These improvements, substitutions and equivalent forms should be deemed to fall within the scope of the present invention, and the protection scope of the present invention is subject only to the claims.

Claims

1. A vehicle environment 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 the modified test vehicle; Conduct dynamic tests on modified test vehicles in a plateau 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 yes, 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: The 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 bends of the exhaust system, supercharger outlet temperature, injector temperature, high-pressure oil pump inlet and outlet temperatures, injector temperature, and GPF temperatures at 1 / 6, 1 / 2 and 5 / 6 positions and inlet and outlet 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 test of the modified test vehicle in the plateau low temperature environment and recording of the 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, cold start with reduced leanness 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, transition 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 the temperature parameters, and if so, optimizing the parameters of the vehicle calibration data to obtain the low temperature test optimization data includes: Determining whether the test data meets the 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 it is startup failure data, 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: The parameter optimization 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.

Images