Turbocharger negative pressure resistance test method and system

Abstract

The present invention proposes a method and system for testing the negative pressure resistance of a turbocharger. The method includes: first, building a negative pressure resistance test bench, then starting the engine and monitoring the current power of the engine. When the target power point is reached, the intake opening is adjusted so that its intake pressure value matches the initial maximum intake negative pressure target value when the negative pressure resistance test is first started. Then, according to the test parameters, the negative pressure resistance test bench is subjected to negative pressure resistance tests under various working conditions. During the negative pressure resistance test, it is determined whether the turbocharger's post-compression pipeline has oil leakage, so as to obtain the theoretical maximum intake negative pressure based on the maximum intake negative pressure target value of the first oil leakage and the first preset pressure value. The turbocharger negative pressure resistance testing method proposed by the present invention simulates and evaluates the negative pressure resistance capability of the supercharger under harsh working conditions of the whole vehicle to accurately obtain the theoretical maximum intake negative pressure of the supercharger's negative pressure resistance capability, thereby providing an experimental basis for the design stage of the vehicle's intake system.

Description

Technical Field

[0001] The present invention relates to the technical field of negative pressure resistance testing, and in particular to a method and system for negative pressure resistance testing of a turbocharger. Background Art

[0002] A turbocharger is essentially an air compressor that increases intake air volume by compressing air. It uses the inertial force of the engine's exhaust gas to drive the turbine inside the turbine chamber. The turbine, in turn, drives the coaxial impeller, which pressurizes air sent from the air filter duct and pressurizes it into the cylinder.

[0003] The compressor seal of the turbocharger commonly used in the prior art is generally a dynamic sealing method, that is, the seal is maintained by relying on the pressure built up in the compression casing when the engine is working to be greater than the pressure in the intermediate oil return chamber. However, during the use of the vehicle, due to the influence of pollutants in the air, the surface of the air filter will gradually become dirty, causing the intake resistance of the engine intake system to increase, thereby causing the negative pressure at the turbocharger intake port to gradually increase. Excessive negative intake pressure can cause oil leakage at the compression end of the turbocharger. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to propose a turbocharger negative pressure resistance test method and system, which simulates and evaluates the negative pressure resistance of the turbocharger under harsh working conditions of the whole vehicle, so as to accurately obtain the theoretical maximum intake negative pressure of the supercharger's negative pressure resistance, thereby providing an experimental basis for the design stage of the vehicle's intake system and ensuring that the turbocharger has no oil leakage risk in the whole vehicle application.

[0005] A method for testing the negative pressure resistance of a turbocharger according to the present invention comprises:

[0006] Obtain the engine model and build a negative pressure test bench according to the engine model, wherein the negative pressure test bench includes the engine, intercooler, turbocharger and air filter;

[0007] Starting the engine in the negative pressure test bench to warm it up, and retrieving from a preset database, based on the engine model, an initial maximum intake negative pressure target value and a target power point of the engine for the first negative pressure test of the negative pressure test bench;

[0008] monitoring the current power of the engine, and when the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure resistance test bench so that the intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value;

[0009] Acquiring test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and operating the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0010] determining whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0011] If there is no oil leakage in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value for the next negative pressure resistance test is calculated according to the first preset pressure value and the maximum intake negative pressure target value corresponding to the current negative pressure resistance test, and the negative pressure resistance test bench is repeatedly subjected to the negative pressure resistance test according to the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the post-compression pipeline of the turbocharger;

[0012] The maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger is obtained, and the theoretical maximum intake negative pressure is obtained according to the maximum intake negative pressure target value corresponding to the first oil leakage and the first preset pressure value.

[0013] In summary, according to the above-mentioned negative pressure test method for turbochargers, by simulating the use of the whole vehicle under actual harsh working conditions, the theoretical maximum intake negative pressure at which the turbocharger can operate normally on the engine can be accurately obtained, thereby ensuring the reliable application of the turbocharger on the engine and the whole vehicle. Specifically, first, a suitable negative pressure test bench is built according to the engine model, and then the engine in the negative pressure test bench is turned on. At the same time, based on the engine model, the initial maximum intake negative pressure target value and the target power point of the engine for the first negative pressure test are quickly obtained from the preset database, and then the current power of the engine is monitored in real time. When the target power point is reached, the intake opening of the negative pressure test bench is adjusted so that its intake pressure value matches the initial maximum intake negative pressure target value when the negative pressure test is first started. Then, the test parameters of the bench are obtained, and the negative pressure test is carried out according to the test parameters. The test bench performs negative pressure resistance tests under various working conditions. During the negative pressure resistance test, it is determined whether there is oil leakage in the post-compression pipeline of the turbocharger. If there is no oil leakage, the maximum intake negative pressure target value for the next negative pressure resistance test is updated to repeat the negative pressure resistance test until oil leakage occurs in the post-compression pipeline. Then, the theoretical maximum intake negative pressure is obtained based on the maximum intake negative pressure target value of the first oil leakage and the first preset pressure value. This allows designers to evaluate in advance whether the negative pressure resistance capability of the turbocharger meets the design and application requirements based on the theoretical maximum intake negative pressure, thereby effectively avoiding the oil leakage risk of the turbocharger when it is used in the whole vehicle.

[0014] In a preferred embodiment of the present invention, the steps of obtaining the engine model and building a negative pressure resistance test bench according to the engine model include:

[0015] An electric intake control valve is installed on the front pipe of the air filter, an intake pressure sensor is installed on the rear pipe of the air filter, and a photoelectric water immersion sensor is installed on the rear pressure pipe of the turbocharger. The electric intake control valve, the intake pressure sensor and the photoelectric water immersion sensor are all electrically connected to a controller.

[0016] In a preferred embodiment of the present invention, the step of monitoring the current power of the engine and, when the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure resistance test bench so that the intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value includes:

[0017] adjusting the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtaining a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, calculating a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and determining whether the current intake pressure change rate is within a first preset intake pressure error range;

[0018] If the current intake pressure change rate is within a first preset intake pressure error range, determining that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value;

[0019] If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

[0020] In a preferred embodiment of the present invention, the step of determining whether the post-compression pipeline of the turbocharger is leaking oil comprises:

[0021] Determining whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time;

[0022] If a monitoring signal sent by the photoelectric water immersion sensor is received, it is determined that an oil leak occurs in the post-compression pipeline of the turbocharger;

[0023] If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the post-compression pipeline of the turbocharger.

[0024] In a preferred embodiment of the present invention, if there is no oil leakage in the post-compression pipeline of the turbocharger, obtaining a maximum intake negative pressure target value for the next negative pressure resistance test according to the first preset pressure value and the initial maximum intake negative pressure target value, and repeatedly performing the negative pressure resistance test on the negative pressure resistance test bench according to the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the post-compression pipeline of the turbocharger, the step includes:

[0025] Repeatedly adjusting the air intake opening of the negative pressure resistance test bench, and determining whether the air intake pressure value of the negative pressure resistance test bench is consistent with the maximum air intake negative pressure target value of the current negative pressure resistance test;

[0026] If the intake pressure value of the negative pressure resistance test bench matches the maximum intake negative pressure target value of the current negative pressure resistance test, repeatedly operating the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0027] repeatedly determining whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0028] If oil leakage occurs in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger is obtained.

[0029] Another aspect of the present invention further provides a turbocharger negative pressure resistance testing system, the system comprising:

[0030] A test bench construction module is used to obtain the engine model and build a negative pressure test bench according to the engine model. The negative pressure test bench includes an engine, an intercooler, a turbocharger, and an air filter;

[0031] a data retrieval module, configured to start the engine in the negative pressure resistance test bench for warming up, and retrieve from a preset database, based on the engine model, an initial maximum intake negative pressure target value and a target power point of the engine for the first negative pressure resistance test of the negative pressure resistance test bench;

[0032] an intake pressure monitoring module, configured to monitor the current power of the engine and, when the current power of the engine reaches the target power point, adjust the intake opening of the negative pressure test bench so that the intake pressure value of the negative pressure test bench matches the initial maximum intake negative pressure target value;

[0033] a negative pressure resistance test execution module, configured to obtain test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and to operate the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0034] An oil leakage monitoring module, used to determine whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0035] a repeat test module, configured to calculate a maximum intake negative pressure target value for a next negative pressure resistance test based on a first preset pressure value and a maximum intake negative pressure target value corresponding to a current negative pressure resistance test if there is no oil leakage in the post-compression pipeline of the turbocharger, and repeatedly perform a negative pressure resistance test on the negative pressure resistance test bench based on the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the post-compression pipeline of the turbocharger;

[0036] The theoretical maximum intake negative pressure acquisition module is used to obtain the maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger, and obtain the theoretical maximum intake negative pressure based on the maximum intake negative pressure target value corresponding to the first oil leakage and the first preset pressure value.

[0037] In a preferred embodiment of the present invention, the intake pressure monitoring module further includes:

[0038] a current intake pressure change rate calculation unit, configured to adjust the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtain a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, so as to calculate a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and to determine whether the current intake pressure change rate is within a first preset intake pressure error range;

[0039] a current intake pressure change rate monitoring unit, configured to determine that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value if the current intake pressure change rate is within a first preset intake pressure error range;

[0040] If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

[0041] In a preferred embodiment of the present invention, the oil leakage monitoring module further includes:

[0042] A monitoring signal receiving unit, configured to determine whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time;

[0043] a monitoring signal detection unit, configured to determine that an oil leak occurs in the post-compression pipeline of the turbocharger upon receiving a monitoring signal sent by the photoelectric water immersion sensor;

[0044] If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the post-compression pipeline of the turbocharger.

[0045] In a preferred embodiment of the present invention, the repeated testing module further includes:

[0046] an air intake opening repeated adjustment unit, configured to repeatedly adjust the air intake opening of the negative pressure resistance test bench and determine whether the air intake pressure value of the negative pressure resistance test bench matches the maximum air intake negative pressure target value of the current negative pressure resistance test;

[0047] a negative pressure test repeating unit, configured to repeatedly operate the engine in the negative pressure test bench according to the test parameters to perform a negative pressure test on the negative pressure test bench if the intake pressure value of the negative pressure test bench matches the maximum intake negative pressure target value of the current negative pressure test;

[0048] an oil leakage repeated detection unit, used for repeatedly determining whether the post-compression pipeline of the turbocharger is leaking oil;

[0049] If oil leakage occurs in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger is obtained.

[0050] Additional aspects and advantages of the present invention will be set forth in part in the following description and, in part, will be obvious from the following description, or may be learned through embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a flow chart of a method for testing the negative pressure resistance of a turbocharger according to the first embodiment of the present invention;

[0052] Figure 2 Schematic diagram of the structure of the negative pressure resistance test bench in the present invention;

[0053] Figure 3 This is a schematic structural diagram of a turbocharger negative pressure resistance testing system proposed in the second embodiment of the present invention.

[0054] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0055] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] See also Figure 1 , which is a flow chart of a method for testing the negative pressure resistance of a turbocharger according to a first embodiment of the present invention, the method includes steps S01 to S07, wherein:

[0058] Step S01: Obtain the engine model and build a negative pressure test bench according to the engine model, wherein the negative pressure test bench includes an engine, an intercooler, a turbocharger, and an air filter;

[0059] It should be noted that the engine models generally include displacements of 1.5L, 1.8L, 2.0L, 2.2L, etc. The negative pressure test bench constructed for each engine model may be different due to the different displacements. Based on this, this step generally first obtains the specific model of the engine, and then builds an appropriate negative pressure test bench according to its model.

[0060] Furthermore, in some optional embodiments of the present invention, the specific process of building a negative pressure resistance test bench is as follows:

[0061] See also Figure 2 , shown is a structural schematic diagram of the negative pressure resistance test bench, wherein an electric intake control valve is installed on the front pipe of the air filter, an intake pressure sensor is installed on the rear pipe of the air filter, and a photoelectric water immersion sensor is installed on the rear pressure pipe of the turbocharger. The electric intake control valve, the intake pressure sensor and the photoelectric water immersion sensor are all electrically connected to a controller.

[0062] Step S02: starting the engine in the negative pressure resistance test bench to warm up, and retrieving from a preset database the initial maximum intake negative pressure target value and the target power point of the engine for the first negative pressure resistance test of the negative pressure resistance test bench according to the engine model;

[0063] It should be noted that, in this embodiment, the preset database is composed of multiple engine models and two types of data corresponding to each engine model. The two types of data are the initial maximum intake negative pressure target value and the target power point of the engine for the first negative pressure resistance test, which is conducive to quick retrieval.

[0064] Step S03: monitoring the current power of the engine. When the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure test bench so that the intake pressure value of the negative pressure test bench matches the initial maximum intake negative pressure target value.

[0065] In this step, for example, the target power point of an engine with a displacement of 2.2L is 192kw@5500rpm, and the target power point is the rated power of the engine.

[0066] Furthermore, in some optional embodiments of the present invention, the process of adjusting the intake opening so that the intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value is specifically as follows:

[0067] adjusting the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtaining a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, calculating a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and determining whether the current intake pressure change rate is within a first preset intake pressure error range;

[0068] If the current intake pressure change rate is within a first preset intake pressure error range, determining that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value;

[0069] If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

[0070] Each time the intake opening of the negative pressure test bench is adjusted based on the first preset intake opening value, the current intake pressure value of the negative pressure test bench is obtained, and the current intake pressure change rate is calculated. This is performed until the current intake pressure change rate after the intake opening adjustment is within the first preset intake pressure error range, indicating that the current intake pressure value of the negative pressure test bench is consistent with the initial maximum intake negative pressure target value. It should be noted that the first preset intake opening value is generally between 0.5% and 2%, and preferably 1%.

[0071] Step S04: Acquiring test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and operating the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0072] By way of example and not limitation, the speed values ​​of a selected engine model include 1000rpm (speed upper limit), 2000rpm, 3000rpm, 4000rpm, 5500rpm (speed upper limit), and the throttle opening includes load conditions of 0%, 25%, 75%, and 100%, that is, each speed value corresponds to load conditions of 0%, 25%, 75%, and 100%, respectively. At the same time, the speed value includes the speed upper limit and the speed upper limit corresponding to the engine model, so as to improve the similarity between the negative pressure resistance simulation test and the actual scenario.

[0073] Step S05: determining whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0074] It can be understood that in this embodiment, the step of determining whether the post-compression pipeline of the turbocharger is leaking oil includes:

[0075] Determining whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time;

[0076] If a monitoring signal sent by the photoelectric water immersion sensor is received, it is determined that an oil leak occurs in the post-compression pipeline of the turbocharger;

[0077] If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the post-compression pipeline of the turbocharger.

[0078] Step S06: If there is no oil leakage in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value for the next negative pressure resistance test is calculated based on the first preset pressure value and the maximum intake negative pressure target value corresponding to the current negative pressure resistance test, and the negative pressure resistance test bench is repeatedly subjected to the negative pressure resistance test based on the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the post-compression pipeline of the turbocharger;

[0079] It should be noted that if there is no oil leakage in the post-compression pipeline of the turbocharger, it means that the turbocharger may not have reached the intake negative pressure limit that it can withstand. Based on this, it is necessary to increase the maximum intake negative pressure target value. The specific method is generally to superimpose the first preset pressure value on the maximum intake negative pressure target value corresponding to this negative pressure resistance test, and then calculate the maximum intake negative pressure target value for the next negative pressure resistance test. For example, the initial maximum intake negative pressure target value △P corresponds to this negative pressure resistance test, then the maximum intake negative pressure target value P for the next negative pressure resistance test is P=△P+2, where the first preset pressure value is 2Kpa. Repeat the negative pressure resistance test on the negative pressure resistance test bench according to the test parameters until the first oil leakage is detected.

[0080] Furthermore, the specific process of repeating the negative pressure resistance test is as follows:

[0081] Repeatedly adjusting the air intake opening of the negative pressure resistance test bench, and determining whether the air intake pressure value of the negative pressure resistance test bench is consistent with the maximum air intake negative pressure target value of the current negative pressure resistance test;

[0082] If the intake pressure value of the negative pressure resistance test bench matches the maximum intake negative pressure target value of the current negative pressure resistance test, repeatedly operating the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0083] repeatedly determining whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0084] If oil leakage occurs in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger is obtained.

[0085] Step S07: Obtaining a maximum intake negative pressure target value corresponding to the first occurrence of oil leakage in the post-compression pipeline of the turbocharger, and obtaining a theoretical maximum intake negative pressure based on the maximum intake negative pressure target value corresponding to the first occurrence of oil leakage and the first preset pressure value.

[0086] It can be understood that the theoretical maximum intake negative pressure is the previous negative pressure resistance test relative to the first oil leakage. That is to say, when the oil leakage occurs for the first time, it means that the turbocharger at this time already has the risk of oil leakage. Therefore, the maximum intake negative pressure target value corresponding to the previous negative pressure resistance test is the theoretical maximum intake negative pressure. That is to say, the maximum intake negative pressure target value corresponding to the first oil leakage minus the first preset pressure value can be used to obtain the theoretical maximum intake negative pressure. Then, it is determined whether the theoretical maximum intake negative pressure is greater than the maximum intake resistance of the intake system's life cycle. If the theoretical maximum intake negative pressure is greater than the maximum intake resistance of the intake system's life cycle, it indicates that the turbocharger's negative pressure resistance can meet the design and application requirements. If the theoretical maximum intake negative pressure is less than or equal to the maximum intake resistance of the intake system's life cycle, the designer needs to make design changes to the turbocharger to make the theoretical maximum intake negative pressure greater than the maximum intake resistance of the intake system's life cycle, thereby effectively avoiding oil leakage of the turbocharger in vehicle applications.

[0087] In summary, according to the above-mentioned negative pressure test method for turbochargers, by simulating the use of the whole vehicle under actual harsh working conditions, the theoretical maximum intake negative pressure at which the turbocharger can operate normally on the engine can be accurately obtained, thereby ensuring the reliable application of the turbocharger on the engine and the whole vehicle. Specifically, first, a suitable negative pressure test bench is built according to the engine model, and then the engine in the negative pressure test bench is turned on. At the same time, based on the engine model, the initial maximum intake negative pressure target value and the target power point of the engine for the first negative pressure test are quickly obtained from the preset database, and then the current power of the engine is monitored in real time. When the target power point is reached, the intake opening of the negative pressure test bench is adjusted so that its intake pressure value matches the initial maximum intake negative pressure target value when the negative pressure test is first started. Then, the test parameters of the bench are obtained, and the negative pressure test is carried out according to the test parameters. The test bench performs negative pressure resistance tests under various working conditions. During the negative pressure resistance test, it is determined whether there is oil leakage in the post-compression pipeline of the turbocharger. If there is no oil leakage, the maximum intake negative pressure target value for the next negative pressure resistance test is updated to repeat the negative pressure resistance test until oil leakage occurs in the post-compression pipeline. Then, the theoretical maximum intake negative pressure is obtained based on the maximum intake negative pressure target value of the first oil leakage and the first preset pressure value. This allows designers to evaluate in advance whether the negative pressure resistance capability of the turbocharger meets the design and application requirements based on the theoretical maximum intake negative pressure, thereby effectively avoiding the oil leakage risk of the turbocharger when it is used in the whole vehicle.

[0088] See also Figure 3 , which is a schematic structural diagram of a turbocharger negative pressure resistance test system according to a second embodiment of the present invention, the system comprises:

[0089] A test bench construction module 10 is used to obtain the engine model and build a negative pressure test bench according to the engine model. The negative pressure test bench includes an engine, an intercooler, a turbocharger, and an air filter.

[0090] a data retrieval module 20 for starting the engine in the negative pressure test bench to warm up the engine and, based on the engine model, retrieving from a preset database the initial maximum intake negative pressure target value and the target power point of the engine for the first negative pressure test of the negative pressure test bench;

[0091] an intake pressure monitoring module 30 for monitoring the current power of the engine and, when the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure test bench so that the intake pressure value of the negative pressure test bench matches the initial maximum intake negative pressure target value;

[0092] Furthermore, in some optional embodiments of the present invention, the intake pressure monitoring module 30 further includes:

[0093] a current intake pressure change rate calculation unit, configured to adjust the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtain a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, so as to calculate a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and to determine whether the current intake pressure change rate is within a first preset intake pressure error range;

[0094] a current intake pressure change rate monitoring unit, configured to determine that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value if the current intake pressure change rate is within a first preset intake pressure error range;

[0095] If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

[0096] a negative pressure resistance test execution module 40, configured to obtain test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and to operate the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench;

[0097] An oil leakage monitoring module 50 is used to determine whether there is oil leakage in the post-compression pipeline of the turbocharger;

[0098] Furthermore, in some optional embodiments of the present invention, the oil leakage monitoring module 50 further includes:

[0099] A monitoring signal receiving unit, configured to determine whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time;

[0100] a monitoring signal detection unit, configured to determine that an oil leak occurs in the post-compression pipeline of the turbocharger upon receiving a monitoring signal sent by the photoelectric water immersion sensor;

[0101] If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the post-compression pipeline of the turbocharger.

[0102] a repeat test module 60 for calculating a maximum intake negative pressure target value for a next negative pressure resistance test based on the first preset pressure value and the maximum intake negative pressure target value corresponding to the current negative pressure resistance test if there is no oil leakage in the post-compression pipeline of the turbocharger, and repeatedly performing the negative pressure resistance test on the negative pressure resistance test bench based on the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the post-compression pipeline of the turbocharger;

[0103] Furthermore, in some optional embodiments of the present invention, the repeated testing module 60 further includes:

[0104] an air intake opening repeated adjustment unit, configured to repeatedly adjust the air intake opening of the negative pressure resistance test bench and determine whether the air intake pressure value of the negative pressure resistance test bench matches the maximum air intake negative pressure target value of the current negative pressure resistance test;

[0105] a negative pressure test repeating unit, configured to repeatedly operate the engine in the negative pressure test bench according to the test parameters to perform a negative pressure test on the negative pressure test bench if the intake pressure value of the negative pressure test bench matches the maximum intake negative pressure target value of the current negative pressure test;

[0106] an oil leakage repeated detection unit, used for repeatedly determining whether the post-compression pipeline of the turbocharger is leaking oil;

[0107] If oil leakage occurs in the post-compression pipeline of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger is obtained.

[0108] The theoretical maximum intake negative pressure acquisition module 70 is used to obtain the maximum intake negative pressure target value corresponding to the first oil leakage in the post-compression pipeline of the turbocharger, and obtain the theoretical maximum intake negative pressure based on the maximum intake negative pressure target value corresponding to the first oil leakage and the first preset pressure value.

[0109] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0110] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for testing the negative pressure resistance of a turbocharger, characterized in that: The method comprises: Obtain the engine model and build a negative pressure test bench according to the engine model, wherein the negative pressure test bench includes the engine, intercooler, turbocharger and air filter; Starting the engine in the negative pressure test bench to warm it up, and retrieving from a preset database, based on the engine model, an initial maximum intake negative pressure target value and a target power point of the engine for the first negative pressure test of the negative pressure test bench; monitoring the current power of the engine, and when the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure resistance test bench so that the intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value; Acquiring test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and operating the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench; determining whether a rear pipeline of the turbocharger is leaking oil; If there is no oil leakage in the rear pipe of the turbocharger, a maximum intake negative pressure target value for the next negative pressure resistance test is calculated according to the first preset pressure value and the maximum intake negative pressure target value corresponding to the current negative pressure resistance test, and the negative pressure resistance test bench is repeatedly subjected to the negative pressure resistance test according to the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the rear pipe of the turbocharger; The maximum intake negative pressure target value corresponding to the first oil leakage in the rear pipe of the turbocharger is obtained, and the theoretical maximum intake negative pressure is obtained according to the maximum intake negative pressure target value corresponding to the first oil leakage and the first preset pressure value.

2. The method for testing the negative pressure resistance of a turbocharger according to claim 1, wherein: The steps of obtaining the engine model and building a negative pressure resistance test bench according to the engine model include: An electric intake control valve is installed on the front pipe of the air filter, an intake pressure sensor is installed on the rear pipe of the air filter, and a photoelectric water immersion sensor is installed on the rear pipe of the turbocharger. The electric intake control valve, the intake pressure sensor and the photoelectric water immersion sensor are all electrically connected to a controller.

3. The method for testing the negative pressure resistance of a turbocharger according to claim 2, wherein: The step of monitoring the current power of the engine and, when the current power of the engine reaches the target power point, adjusting the intake opening of the negative pressure resistance test bench so that the intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value includes: adjusting the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtaining a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, calculating a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and determining whether the current intake pressure change rate is within a first preset intake pressure error range; If the current intake pressure change rate is within a first preset intake pressure error range, determining that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value; If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

4. The method for testing the negative pressure resistance of a turbocharger according to claim 3, wherein: The step of determining whether the rear pipeline of the turbocharger is leaking oil comprises: Determining whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time; If a monitoring signal sent by the photoelectric water immersion sensor is received, it is determined that an oil leak occurs in the rear pipeline of the turbocharger; If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the rear pipeline of the turbocharger.

5. The method for testing the negative pressure resistance of a turbocharger according to claim 4, wherein: If the rear pipe of the turbocharger does not leak oil, obtaining a maximum intake negative pressure target value for a next negative pressure resistance test according to the first preset pressure value and the initial maximum intake negative pressure target value, and repeatedly performing the negative pressure resistance test on the negative pressure resistance test bench according to the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the rear pipe of the turbocharger, the step includes: Repeatedly adjusting the air intake opening of the negative pressure resistance test bench, and determining whether the air intake pressure value of the negative pressure resistance test bench is consistent with the maximum air intake negative pressure target value of the current negative pressure resistance test; If the intake pressure value of the negative pressure test bench matches the maximum intake negative pressure target value of the current negative pressure test, repeatedly operating the engine in the negative pressure test bench according to the test parameters to perform a negative pressure test on the negative pressure test bench; Repeatedly determining whether a rear pipeline of the turbocharger is leaking oil; If oil leakage occurs in the rear pipe of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the rear pipe of the turbocharger is obtained.

6. A turbocharger negative pressure resistance test system, characterized in that: The system comprises: A test bench construction module is used to obtain the engine model and build a negative pressure test bench according to the engine model. The negative pressure test bench includes an engine, an intercooler, a turbocharger, and an air filter; a data retrieval module, configured to start the engine in the negative pressure resistance test bench for warming up, and retrieve from a preset database, based on the engine model, an initial maximum intake negative pressure target value and a target power point of the engine for the first negative pressure resistance test of the negative pressure resistance test bench; an intake pressure monitoring module, configured to monitor the current power of the engine and, when the current power of the engine reaches the target power point, adjust the intake opening of the negative pressure test bench so that the intake pressure value of the negative pressure test bench matches the initial maximum intake negative pressure target value; a negative pressure resistance test execution module, configured to obtain test parameters of the negative pressure resistance test bench, the test parameters including a plurality of speed values ​​corresponding to the engine and a plurality of throttle openings corresponding to each speed value, and to operate the engine in the negative pressure resistance test bench according to the test parameters to perform a negative pressure resistance test on the negative pressure resistance test bench; An oil leakage monitoring module, used to determine whether the rear pipeline of the turbocharger is leaking oil; a repeat test module, configured to calculate a maximum intake negative pressure target value for a next negative pressure resistance test based on a first preset pressure value and a maximum intake negative pressure target value corresponding to a current negative pressure resistance test if there is no oil leakage in the rear pipe of the turbocharger, and repeatedly perform a negative pressure resistance test on the negative pressure resistance test bench based on the maximum intake negative pressure target value for the next negative pressure resistance test until oil leakage occurs in the rear pipe of the turbocharger; The theoretical maximum intake negative pressure acquisition module is used to obtain the maximum intake negative pressure target value corresponding to the first oil leakage in the rear pipe of the turbocharger, and obtain the theoretical maximum intake negative pressure based on the maximum intake negative pressure target value corresponding to the first oil leakage and the first preset pressure value.

7. The turbocharger negative pressure resistance test system according to claim 6, characterized in that: The intake pressure monitoring module further includes: a current power change rate calculation unit, configured to adjust the intake opening of the negative pressure resistance test bench according to a first preset intake opening value, and obtain a current intake pressure value of the negative pressure resistance test bench after the intake opening is adjusted, calculate a current intake pressure change rate of the engine according to the current intake pressure value and the initial maximum intake negative pressure target value, and determine whether the current intake pressure change rate is within a first preset intake pressure error range; a current power change rate monitoring unit, configured to determine that the current intake pressure value of the negative pressure resistance test bench is consistent with the initial maximum intake negative pressure target value if the current intake pressure change rate is within a first preset intake pressure error range; If the current intake pressure change rate is not within the first preset intake pressure error range, the intake opening of the negative pressure resistance test bench is adjusted again according to the first preset intake opening value until the current intake pressure value of the negative pressure resistance test bench matches the initial maximum intake negative pressure target value.

8. The turbocharger negative pressure resistance test system according to claim 7, characterized in that: The oil leakage monitoring module also includes: A monitoring signal receiving unit, configured to determine whether a monitoring signal sent by the photoelectric water immersion sensor is received within a first preset time; a monitoring signal detection unit, configured to determine that an oil leak occurs in a rear pipe of the turbocharger upon receiving a monitoring signal sent by the photoelectric water immersion sensor; If the monitoring signal sent by the photoelectric water immersion sensor is not received, it is determined that there is no oil leakage in the rear pipeline of the turbocharger.

9. The turbocharger negative pressure resistance test system according to claim 8, characterized in that: The repeated testing module also includes: an air intake opening repeated adjustment unit, configured to repeatedly adjust the air intake opening of the negative pressure resistance test bench and determine whether the air intake pressure value of the negative pressure resistance test bench matches the maximum air intake negative pressure target value of the current negative pressure resistance test; a negative pressure test repeating execution unit, configured to repeatedly operate the engine in the negative pressure test bench according to the test parameters to perform a negative pressure test on the negative pressure test bench if the intake pressure value of the negative pressure test bench matches the maximum intake negative pressure target value of the current negative pressure test; an oil leakage repeated detection unit, used for repeatedly determining whether the rear pipeline of the turbocharger is leaking oil; If oil leakage occurs in the rear pipe of the turbocharger, a maximum intake negative pressure target value corresponding to the first oil leakage in the rear pipe of the turbocharger is obtained.

Images