A protection calibration test method for turbocharger

Abstract

The embodiment of the present application discloses a protection calibration test method for a turbocharger. The method of the present application includes: completing the matching calibration of the engine bench of the supercharger, obtaining the original protection parameters of the supercharger; installing the engine and warming it up; the test phase includes S101, engaging the first gear for full throttle acceleration operation; S102, releasing the throttle after the engine speed reaches the highest idle speed; S103, full throttle after the speed drops to the first speed value; repeating S102 to S103 until the speed drops to the second speed value; S104, obtaining the protection parameters of the supercharger in S102 to S103; S105, when the protection parameter change data is not within the limit range, optimizing the engine parameters, repeating S101 to S104 until the protection parameter change data is within the limit range; S106, when the protection parameter change data is within the limit range, adding a gear for full throttle acceleration operation, repeating S102 to S104 until the protection parameter change data obtained in all gears of the vehicle are within the limit range; wherein, the supercharger hardware is tested during the test phase.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of testing of automobile engine parts, and in particular to a protection calibration test method for a turbocharger. Background Art

[0002] As an important component installed on the engine, the application of the supercharger on the engine includes the supercharger's allowable speed, allowable temperature before turbine, allowable pressure before turbine, and allowable temperature at the compressor outlet. After the supercharged engine is installed on the vehicle, the supercharger speed, temperature before turbine, pressure before turbine, and compressor outlet temperature will vary due to differences in the vehicle's use environment and driving conditions. Based on the test of the actual use conditions and environment of the vehicle, the supercharger's limit speed, limit temperature before turbine, limit pressure before turbine, and limit temperature level at the compressor outlet can be understood and confirmed to effectively protect the supercharger. However, the existing calibration test is not targeted at testing this component, and the test intensity is not strong enough to conduct special testing on the parameter characteristics of the supercharger. Therefore, in order to cope with the vehicle's working conditions and vehicle use environment under different circumstances, and to reduce the problem of the supercharger being damaged due to overheating, overspeeding, etc. during the use of the vehicle, it is necessary to design a corresponding vehicle engine supercharger protection calibration test method to perform protection calibration and verification on the relevant parameters of the supercharger. Summary of the invention

[0003] The embodiment of the present application provides a protection calibration test method for a turbocharger, which is used to adapt to the whole vehicle test of all matching supercharger engines, and performs protection calibration and verification and confirmation on the supercharger based on the collected data.

[0004] The present application provides a turbocharger protection calibration test method, comprising:

[0005] The method comprises a preparation phase and a test phase:

[0006] The preparation stage includes the following steps:

[0007] A1, completing the matching calibration of the engine bench of the supercharger and obtaining the original protection parameters of the supercharger;

[0008] A2, assembling the engine to the vehicle and warming up the engine;

[0009] A3, test road design, the road includes a straight section;

[0010] The test phase includes the following steps:

[0011] S101, shift to first gear and accelerate at full throttle;

[0012] S102, releasing the accelerator pedal after the engine speed reaches the maximum idling speed;

[0013] S103, performing full throttle operation after the engine speed drops to a first speed value, the first speed value being (a-bN) r / min, a being the maximum idle speed, b being a constant, and N being the number of times the engine speed drops at the same gear position;

[0014] Repeating steps S102 to S103 until the engine speed drops to a second speed value;

[0015] S104, acquiring the protection parameters of the supercharger in steps S102 to S103 to generate protection parameter change data;

[0016] S105, when the protection parameter change data is not within the limit range, optimizing the engine parameters, repeating the cycle of steps S101 to S104 until the protection parameter change data is within the limit range, the optimization includes reducing the fuel injection amount of the engine and reducing the boost pressure;

[0017] S106, when the protection parameter change data is within the limit range, the vehicle is shifted to a higher gear and full throttle acceleration is performed, and steps S102 to S104 are repeated until the protection parameter change data acquired for all gears of the vehicle are within the limit range;

[0018] Wherein, in the test phase, hardware detection is performed on the supercharger.

[0019] Optionally, the vehicle further includes a data collector, which is used to collect protection parameters of the supercharger and has a sampling frequency.

[0020] Optionally, the protection parameters of the supercharger include the rotation speed, turbine inlet temperature, turbine inlet pressure and compressor outlet temperature of the supercharger.

[0021] Optionally, the water temperature of the heat engine in the preparation stage is not less than 70 degrees Celsius.

[0022] Optionally, the test phase further includes the following steps:

[0023] S107, when the protection parameter change data of all gears tested of the vehicle are within the limit range, shift gears sequentially from the first gear and perform full throttle acceleration operation;

[0024] S108, detecting and recording the second protection parameter of the supercharger after step S107 in the test phase to generate second protection parameter change data;

[0025] S109, when the second protection parameter change data is within the limit range, confirming that the engine matching is completed;

[0026] S110, when the second protection parameter change data is not within the limit range, the engine parameters are optimized, and steps S107 to S108 are repeated until the second protection parameter change data is within the limit range.

[0027] Optionally, the hardware detection includes: performing component inspection of the supercharger after any step in the test phase.

[0028] Optionally, the protection calibration test method further includes an ending stage, and the ending stage includes the following steps:

[0029] B1, performing bench performance retest on the supercharger and the engine to detect whether there is any abnormality in performance response;

[0030] B2, when the retest result is normal, comparing the original protection parameters of the supercharger with the latest acquired protection parameters;

[0031] B3. When the difference between the original protection parameter and the most recently acquired protection parameter is within the deviation limit range, a protection calibration test report for the supercharger is issued.

[0032] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0033] The supercharger protection calibration test method provided in the present application is suitable for continuously adjusting the engine speed and performing corresponding full throttle / release throttle operations in different environments and in various gears, and obtaining the protection parameters of the supercharger in each process. When the protection parameters obtained in each process are within the limit range, the supercharger is calibrated and confirmed, thereby completing the matching of the supercharger engine, and is suitable for the whole vehicle test of all matching supercharger engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 A schematic diagram of the flow of test data in a protection calibration test method for a turbocharger provided in an embodiment of the present application;

[0036] Figure 2 A schematic flow chart of an embodiment of a protection calibration test method for a turbocharger provided in an embodiment of the present application;

[0037] Figure 3-1 to Figure 3-2 A schematic flow chart of another embodiment of a protection calibration test method for a turbocharger provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] like Figure 2 As shown, combined Figure 1 , an embodiment of a turbocharger protection calibration test method provided in an embodiment of the present application, the method comprises a preparation phase and a test phase, the preparation phase comprises the following steps:

[0039] A1, complete the matching calibration of the engine bench of the supercharger and obtain the original protection parameters of the supercharger;

[0040] A2, assemble the engine to the vehicle and warm up the engine;

[0041] A3, test road design, the road includes a straight section.

[0042] Specifically, before carrying out the turbocharger protection calibration test method, it is necessary to complete the engine bench performance matching of the supercharger first, confirm that the performance indicators under the engine bench state can meet the requirements, and avoid the situation where the supercharger is damaged due to excessive deviation from the engine matching when the supercharger is configured on the vehicle. In order to confirm whether the degree of damage to the supercharger components is within an acceptable range at the end of the test, the deformation of the supercharger components can be detected. Therefore, it is necessary to obtain the original protection parameters of the supercharger before the start of the test for subsequent deformation deviation comparison, where the protection parameters include but are not limited to parameters such as the supercharger speed, turbine pre-turbine temperature, turbine pre-turbine pressure, and compressor outlet temperature.

[0043] Since the lubricating oil has a certain viscosity, when it flows inside the engine, when the engine temperature is high, the fluidity is good, and when the engine temperature is low, the viscosity of the oil will increase, which will cause its fluidity inside the engine to be poor. If the engine is run intensively in a cold state, the oil cannot lubricate the lubricated parts well, and the engine will affect its own service life due to wear. Therefore, before conducting a vehicle test, in order for the engine to work normally, it is necessary to preheat the engine so that the engine can be in a good working condition to cope with severe acceleration and deceleration tests. For example, adjust the water temperature of the engine to above 70 degrees Celsius to allow good matching clearances between the various mechanisms of the engine to achieve good matching lubrication.

[0044] In the embodiment of the present application, the protection calibration test method of the turbocharger provided can be used in various environments such as plains, plateaus, and high cold, but in order to ensure the safety of the test, the road selection should be a straight section with fewer vehicles. Optionally, multiple types of sections can be selected for combined testing. For example, the target turbocharger can be placed on the same vehicle and protection calibration tests can be carried out on straight urban roads, national roads, mountain roads, highways and other types of sections, so that the test is supported by a large amount of test data in different environments and altitudes, which can improve the accuracy of its protection calibration.

[0045] The pilot phase includes the following steps:

[0046] S101, shift to first gear and accelerate at full throttle;

[0047] S102, releasing the accelerator pedal after the engine speed reaches the maximum idling speed;

[0048] S103, after the engine speed drops to a first speed value, full throttle operation is performed, the first speed value is (a-bN) r / min, a is the maximum idle speed, b is a constant, and N is the number of times the engine speed is reduced at the same gear;

[0049] Repeating steps S102 to S103 until the engine speed drops to a second speed value;

[0050] S104, acquiring the protection parameters of the supercharger in steps S102 to S103 to generate protection parameter change data;

[0051] S105, when the protection parameter change data is not within the limit range, the engine parameters are optimized, and the cycle of steps S101 to S104 is repeated until the protection parameter change data is within the limit range, and the optimization includes reducing the fuel injection amount and the boost pressure of the engine;

[0052] S106, when the protection parameter change data is within the limit range, the vehicle is shifted to a higher gear and full throttle acceleration is performed, and steps S102 to S104 are repeated until the protection parameter change data acquired for all gears of the vehicle are within the limit range;

[0053] During the test phase, the supercharger is subjected to hardware testing.

[0054] First of all, please refer to Figure 1 , the data flow in the experimental phase is as follows Figure 1As shown, during the test cycle operation, the data collector records the data of various parameters of the supercharger at a certain sampling frequency. During the test, the data in the data collector can be uploaded to the computer for analysis and processing. The driver performs the test operation in the vehicle according to the statistical analysis fed back by the computer, and transmits the driving signal to the controller. The controller then makes a corresponding performance response to the vehicle according to the received driving signal, such as adjusting the engine speed, the gear position of the vehicle, etc. Optionally, a data collector is also provided in the vehicle, which is used to collect the protection parameters of the supercharger before and after the test, and is provided with a sampling frequency.

[0055] Under ideal conditions, after the engine is warmed up, on a suitable straight road section, the vehicle is shifted to first gear and accelerated at full throttle until the engine speed reaches the vehicle's maximum idling speed, and then the throttle is released. When the engine speed drops to a first speed value, full throttle acceleration is performed, wherein the first speed value is (a-bN) r / min, a represents the maximum idling speed, b represents a constant, and N represents the number of times the engine executes a speed reduction; the above process is repeated until the engine speed drops to a second speed value and then stops. For example, shift to first gear and accelerate at full throttle. When the engine speed reaches the vehicle's maximum idling speed a, which is 4000r / min, release the throttle. Assume that the engine speed reduction amplitude b is 500r / min (the reduction amplitude b can be flexibly adjusted according to actual conditions). The speed reduction is performed for the first time. When the engine speed drops to (4000-500)=3500r / min, full throttle acceleration is performed. When the engine speed returns to the maximum idling speed, release the throttle again. The speed reduction is performed for the second time. After the engine speed drops to (4000-2*500)=3000r / min, full throttle acceleration is performed again. This pattern is repeated until the engine speed drops to 1000r / min. In actual application scenarios, due to road conditions, it may not be possible to reach the maximum speed of a high gear. For the driving safety of the vehicle, the speed of the vehicle can be limited to a certain speed. For example, the speed of the vehicle can be limited to 150km / h. That is, when the vehicle speed reaches 150km / h, the engine speed can be regarded as the maximum idling speed.

[0056] Furthermore, when the vehicle is in gear for acceleration / deceleration, the protection parameters of the supercharger, such as the speed of the supercharger, the pre-turbine temperature, the pre-turbine pressure, and the compressor outlet temperature, are obtained, and these protection parameters are counted separately to generate respective protection parameter change data. When it is detected that these protection parameters are not within the limit range of the relevant parameters, it is necessary to optimize the engine parameters by changing the fuel injection amount of the engine or reducing the boost pressure, and then repeat the full throttle and release throttle operations until the detected protection parameters can reach the limit range of the relevant parameters, then increase the gear, repeat the above-mentioned throttle, release throttle operations, and judge whether the protection parameters in the process are within the limit range. And so on, until all the gears of the vehicle are detected, and the protection parameters of all gears are within the limit range, it means that the supercharger matches the engine.

[0057] Optionally, after any step in the test phase, the components of the supercharger can be inspected to timely understand the structural loss of the supercharger.

[0058] In the embodiment of the present application, by continuously adjusting the engine speed and performing corresponding full throttle / release throttle operations, the test method has good operability and repeatability; the protection parameter change data of the supercharger is continuously obtained during the process, and by analyzing and comparing the relationship between the protection parameter change data and the limit range, the degree of adaptation between the supercharger and the engine can be significantly understood and improved, and the practicality is strong.

[0059] like Figure 3-1 to Figure 3-2 As shown, another embodiment of the turbocharger protection calibration test method provided in the embodiment of the present application includes a preparation phase, a test phase and an end phase. The preparation phase includes the following steps:

[0060] A1, complete the matching calibration of the engine bench of the supercharger and obtain the original protection parameters of the supercharger;

[0061] A2: Install the engine to the vehicle and warm up the engine. The water temperature of the engine should be no less than 70 degrees Celsius.

[0062] A3, test road design, the road includes a straight section;

[0063] The pilot phase includes the following steps:

[0064] S101, shift to first gear and accelerate at full throttle;

[0065] S102, releasing the accelerator pedal after the engine speed reaches the maximum idling speed;

[0066] S103, after the engine speed drops to a first speed value, full throttle operation is performed, the first speed value is (a-bN) r / min, a is the maximum idle speed, b is a constant, and N is the number of times the engine speed is reduced at the same gear;

[0067] Repeating steps S102 to S103 until the engine speed drops to a second speed value;

[0068] S104, acquiring the protection parameters of the supercharger in steps S102 to S103 to generate protection parameter change data;

[0069] S105, when the protection parameter change data is not within the limit range, the engine parameters are optimized, and the cycle of steps S101 to S104 is repeated until the protection parameter change data is within the limit range, and the optimization includes reducing the fuel injection amount and the boost pressure of the engine;

[0070] S106, when the protection parameter change data is within the limit range, the vehicle is shifted to a higher gear and full throttle acceleration is performed, and steps S102 to S104 are repeated until the protection parameter change data acquired for all gears of the vehicle are within the limit range;

[0071] S107, when the protection parameter change data of all gears tested by the vehicle are within the limit range, shift gears sequentially from the first gear and perform full throttle acceleration operation;

[0072] S108, detecting and recording the second protection parameter of the supercharger after step S107 in the test phase to generate second protection parameter change data;

[0073] S109, when the second protection parameter change data is within the limit range, confirming that the engine matching is completed;

[0074] S110, when the second protection parameter change data is not within the limit range, the engine parameters are optimized, and steps S107 to S108 are repeated until the second protection parameter change data is within the limit range;

[0075] Among them, the hardware test of the supercharger is carried out during the test phase;

[0076] The closing phase includes the following steps:

[0077] B1, retest the supercharger and engine on the bench to detect any abnormal performance response;

[0078] B2, when the retest result is normal, compare the original protection parameters of the supercharger with the latest protection parameters;

[0079] B3. When the difference between the original protection parameter and the latest protection parameter is within the deviation limit, a protection calibration test report for the supercharger shall be issued.

[0080] Optionally, after any step in the test phase, the components of the supercharger can be inspected to timely understand the structural loss of the supercharger.

[0081] In the embodiment of the present application, when it is determined that the protection parameter change data obtained by each gear of the vehicle is within the limit range, in order to further improve the accuracy of the detection, it is also possible to start from the first gear, sequentially and continuously shift gears to perform full throttle acceleration, detect and record the second protection parameter of the supercharger after step S108 during the test phase, and if the change data of the second protection parameter is still within the limit range, the engine matching is considered to be completed. For example, the vehicle under test has one to five gears, and the driver sequentially shifts from the first gear to the second gear, the third gear, the fourth gear and the fifth gear, collects the instantaneous protection parameters of the supercharger in each gear, and forms the second protection parameter change data. If the second protection parameter change data formed by the combination of these five gears is also within the limit range, it can be confirmed that there is no need to optimize the engine parameters, and the engine and the supercharger have been matched.

[0082] After the test, the vehicle can be inspected and the engine can be removed from the vehicle for bench performance retesting to detect whether there are any abnormalities in the performance response. When the retest result shows no abnormalities, the deformation of the supercharger components after the test is tested to see if it is within an acceptable range. A simpler detection method is to pre-set an acceptable deviation limit range, and then compare the original protection parameters of the supercharger with the latest protection parameter values. If the difference between the two is within the set deviation limit range, it can be determined that the deformation of the supercharger after the test is acceptable, and a protection calibration test report for the supercharger approved by the final test can be issued.

[0083] Optionally, the vehicle is also provided with a data collector, which is used to collect protection parameters of the supercharger before and after the test, and has a sampling frequency. During the test cycle operation, the data collector records the data of various parameters of the supercharger at a certain sampling frequency. After the test is completed, the data in the data collector can be uploaded to a computer for analysis and processing.

Claims

1. A turbocharger protection calibration test method, characterized in that: include: The method comprises a preparation phase and a test phase: The preparation stage includes the following steps: A1, completing the matching calibration of the engine bench of the supercharger and obtaining the original protection parameters of the supercharger; A2, assembling the engine to the vehicle and warming up the engine; A3, test road design, the road includes a straight section; The water temperature of the heat engine in the preparation stage is not less than 70 degrees Celsius; The test phase includes the following steps: S101, shift to first gear and accelerate at full throttle; S102, releasing the accelerator pedal after the engine speed reaches the maximum idling speed; S103, performing full throttle operation after the engine speed drops to a first speed value, the first speed value being (a-bN) r / min, a being the maximum idle speed, b being a constant, and N being the number of times the engine speed drops at the same gear position; Repeating steps S102 to S103 until the engine speed drops to a second speed value; S104, acquiring the latest protection parameters of the supercharger in steps S102 to S103 to generate protection parameter change data; S105, when the protection parameter change data is not within the limit range, optimizing the engine parameters, repeating the cycle of steps S101 to S104 until the protection parameter change data is within the limit range, the optimization includes reducing the fuel injection amount of the engine and reducing the boost pressure; S106, when the protection parameter change data is within the limit range, the vehicle is shifted to a higher gear and full throttle acceleration is performed, and steps S102 to S104 are repeated until the protection parameter change data acquired for all gears of the vehicle are within the limit range; Wherein, the hardware inspection of the supercharger is performed in the test phase, and the hardware inspection includes: performing component inspection of the supercharger after any step in the test phase; The test phase also includes the following steps: S107, when the protection parameter change data of all gears tested of the vehicle are within the limit range, shift gears sequentially from the first gear and perform full throttle acceleration operation; S108, detecting and recording the second protection parameter of the supercharger after step S107 in the test phase to generate second protection parameter change data; S109, when the second protection parameter change data is within the limit range, confirming that the engine matching is completed; S110, when the second protection parameter change data is not within the limit range, optimizing the engine parameters, and repeating steps S107 to S108 until the second protection parameter change data is within the limit range; The protection calibration test method also includes an ending stage, which includes the following steps: B1, performing bench performance retest on the supercharger and the engine to detect whether there is any abnormality in performance response; B2, when the retest result is normal, comparing the original protection parameters of the supercharger with the latest acquired protection parameters; B3. When the difference between the original protection parameter and the most recently acquired protection parameter is within the deviation limit range, a protection calibration test report for the supercharger is issued.

2. The protection calibration test method according to claim 1, characterized in that: The vehicle also includes a data collector, which is used to collect protection parameters of the supercharger and is provided with a sampling frequency.

3. The protection calibration test method according to claim 2, characterized in that: The protection parameters of the supercharger include the rotation speed, turbine inlet temperature, turbine inlet pressure and compressor outlet temperature of the supercharger.

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