Steering wheel jitter analysis method under working condition of starting air conditioner during idle charging of hybrid electric vehicle

Abstract

The invention provides a steering wheel jitter analysis method under the working condition of starting an air conditioner during idle charging of a hybrid vehicle, which comprises the following steps: testing the jitter of a steering wheel under the working condition of starting the air conditioner during idle charging of the hybrid vehicle, and if the jitter of the steering wheel does not meet the set target requirement, executing the next step; acquiring a spectrogram when the steering wheel shakes abnormally, and confirming frequency characteristics when the steering wheel shakes abnormally; testing and analyzing the vibration condition of each vibration source causing the shaking of the steering wheel; carrying out vibration and modal test analysis on the parts on each vibration transmission path; determining a vibration source and a vibration transmission path which cause abnormal shaking of the steering wheel according to a test analysis result; and optimizing the determined vibration source and the vibration transmission path, so that the jitter level of the steering wheel meets the set target requirement. According to the invention, the specific reason of abnormal shaking of the steering wheel during idling charging and starting of the air conditioner can be conveniently found and optimized, so that the shaking of the steering wheel can meet the requirement.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile vibration analysis, and in particular relates to a method for analyzing steering wheel vibration of a hybrid automobile during idling, charging and air-conditioning operation. Background Art

[0002] When a hybrid vehicle is idling and charging and the air conditioner is on, the steering wheel shake problem seriously affects the driving comfort. At present, the evaluation criteria and solutions for the steering wheel shake problem under this condition mainly rely on the experience of NVH engineers, which has high requirements for the experience of engineers. At the same time, using this method, on the one hand, there is no unified standard for the determination of steering wheel shake. On the other hand, when encountering the steering wheel shake problem, it is mainly to disconnect the main components on the transmission path, such as the front-end module, pipeline, suspension, steering wheel, etc., and perform weight tests or replace the fan, blower, etc., and solve it by optimizing the transmission path or noise source. The specific cause of the steering wheel shake cannot be locked, and an effective solution cannot be given; sometimes when encountering the joint influence of engine excitation, fan excitation, blower excitation and steering wheel mode, it is easy to make a wrong judgment, and an exact solution cannot be given, and the efficiency is low.

[0003] Therefore, how to design a steering wheel jitter analysis method for a hybrid vehicle when idling, charging and turning on the air conditioner so as to easily find the specific cause of the steering wheel jitter has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a method for analyzing steering wheel vibration when a hybrid vehicle is idling, charging, and turning on the air conditioner, so as to solve the above-mentioned technical problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation, comprising the following steps:

[0007] Step S1, confirming the jitter level:

[0008] Test the steering wheel vibration of the hybrid vehicle when idling and charging with the air conditioner on. Analyze whether the steering wheel vibration level meets the set target requirements based on the test results. If not, the steering wheel has abnormal vibration and proceed to the next step.

[0009] Step S2: confirm the frequency characteristics of abnormal jitter:

[0010] Obtain the frequency spectrum of the steering wheel when it shakes abnormally, and confirm the frequency characteristics of the steering wheel when it shakes abnormally;

[0011] Step S3: Test analysis:

[0012] Test and analyze the vibration conditions of various vibration sources that cause steering wheel vibration during idling charging and air conditioning operation;

[0013] Conduct vibration and modal test analysis on components on each vibration transmission path that causes steering wheel vibration during idling charging and air conditioning operation;

[0014] Step S4, determine the cause of abnormal jitter and optimize:

[0015] According to the test and analysis results in the previous step, determine the vibration source and vibration transmission path that causes abnormal steering wheel vibration;

[0016] The determined vibration sources and vibration transmission paths are optimized so that the steering wheel vibration level meets the set target requirements.

[0017] Preferably, in step S3, when testing and analyzing the vibration conditions of each vibration source causing the steering wheel vibration, the obtained test and analysis results include the vibration magnitude and frequency of each vibration source.

[0018] Preferably, in step S4, the method for determining the vibration source causing abnormal shaking of the steering wheel is: confirming whether the vibration magnitude and frequency peak of each vibration source are consistent with the frequency characteristics when the steering wheel shakes abnormally, and whether the vibration magnitude meets the requirements; if either of the two is no, then determining that the vibration source is the vibration source causing abnormal shaking of the steering wheel.

[0019] Preferably, when performing vibration and modal test analysis on components on each vibration transmission path that causes steering wheel vibration, first determine the components that are strongly correlated with the steering wheel vibration frequency peak, then change the modal characteristics of each component, and then test whether the abnormal vibration frequency peak of the steering wheel is reduced after the modal characteristics of each component are changed. If so, optimize the vibration transmission path with the component.

[0020] Preferably, the vibration sources causing the steering wheel to shake during idling charging and air conditioning operation include one or more of the following: an engine, an engine cooling fan, a blower, a compressor, and a water pump.

[0021] Preferably, the vibration transmission path that causes the steering wheel to shake during idle charging and air conditioning operation includes one or more of the following:

[0022] Path 1, in order: engine, suspension, body sheet metal, CCB tube beam, steering wheel;

[0023] Path 2, in order: engine, air conditioning pipe, body sheet metal, CCB pipe beam, steering wheel;

[0024] Path three, in order: engine cooling fan, front-end module, body sheet metal, CCB tube beam, steering wheel;

[0025] Path 4, in order: blower, body sheet metal, CCB tube beam, steering wheel;

[0026] Path 5, in order: compressor, air conditioning pipeline, body sheet metal, CCB pipe beam, steering wheel;

[0027] Path six, in order: water pump, body sheet metal, CCB tube beam, steering wheel.

[0028] Preferably, the water pump includes an engine cooling water pump, a HVAC water pump, a battery cooling water pump, and an electronically controlled cooling water pump.

[0029] Preferably, the target requirement is set to be no more than 0.03 g.

[0030] The beneficial effects of the present invention are:

[0031] The method for analyzing steering wheel vibration of a hybrid vehicle during idling, charging, and air conditioning operation can conveniently find the specific cause of abnormal vibration of the steering wheel during idling, charging, and air conditioning operation, and then optimize the vibration source and vibration transmission path that cause the abnormal vibration of the steering wheel, so that the vibration of the steering wheel can meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail in conjunction with the drawings, wherein

[0033] Figure 1 A flow chart of a method for analyzing steering wheel vibration during idling charging and air conditioning operation of a hybrid vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a method for analyzing steering wheel vibration when a hybrid vehicle is idling and charging and air conditioning is turned on, which includes the following steps:

[0039] Step S1, confirming the jitter level:

[0040] Test the steering wheel vibration of the hybrid vehicle when idling and charging with the air conditioner on. Analyze whether the steering wheel vibration level meets the set target requirements based on the test results. If not, the steering wheel has abnormal vibration and proceed to the next step.

[0041] Step S2: confirm the frequency characteristics of abnormal jitter:

[0042] Obtain the frequency spectrum of the steering wheel when it shakes abnormally, and confirm the frequency characteristics of the steering wheel when it shakes abnormally;

[0043] Step S3: Test analysis:

[0044] Test and analyze the vibration conditions of various vibration sources that cause steering wheel vibration during idling charging and air conditioning operation;

[0045] Conduct vibration and modal test analysis on components on each vibration transmission path that causes steering wheel vibration during idling charging and air conditioning operation;

[0046] Step S4, determine the cause of abnormal jitter and optimize:

[0047] According to the test and analysis results in the previous step, determine the vibration source and vibration transmission path that causes abnormal steering wheel vibration;

[0048] The determined vibration sources and vibration transmission paths are optimized so that the steering wheel vibration level meets the set target requirements.

[0049] The method for analyzing steering wheel vibration of a hybrid vehicle during idling, charging, and air conditioning operation provided in an embodiment of the present invention can easily find the specific cause of abnormal steering wheel vibration during idling, charging, and air conditioning operation, and then optimize the vibration source and vibration transmission path that cause the abnormal steering wheel vibration, so that the steering wheel vibration can meet the requirements.

[0050] Further, in step S3, when the vibration conditions of each vibration source causing the steering wheel shaking are tested and analyzed, the test and analysis results obtained include the vibration magnitude and frequency of each vibration source. In step S4, the method for determining the vibration source causing the abnormal steering wheel shaking is: confirming whether the vibration magnitude and frequency peak of each vibration source are consistent with the frequency characteristics when the steering wheel shakes abnormally, and whether the vibration magnitude meets the requirements. If either of the two is no, then the vibration source is determined to be the vibration source causing the abnormal steering wheel shaking.

[0051] Specifically, when performing vibration and modal test analysis on components on each vibration transmission path that causes steering wheel vibration, first determine the components that are strongly correlated with the steering wheel vibration frequency peak, and then change the modal characteristics of each component, such as adding weights, reinforcements, disconnections, etc., and then test whether the abnormal vibration frequency peak of the steering wheel is reduced after the modal characteristics of each component are changed. If so, optimize the vibration transmission path with the component.

[0052] Specifically, the vibration sources that cause steering wheel vibration during idling charging and air conditioning operation include one or more of the following: engine, engine cooling fan, blower, compressor, and water pump.

[0053] Specifically, the vibration transmission paths that cause steering wheel vibration during idle charging and air conditioning operation include one or more of the following:

[0054] Path 1, in order: engine, suspension, body sheet metal, CCB tube beam, steering wheel;

[0055] Path 2, in order: engine, air conditioning pipe, body sheet metal, CCB pipe beam, steering wheel;

[0056] Path three, in order: engine cooling fan, front end module (FEM for short, a system part integrating the front end components of the car), body sheet metal, CCB pipe beam, steering wheel;

[0057] Path 4, in order: blower, body sheet metal, CCB tube beam, steering wheel;

[0058] Path 5, in order: compressor, air conditioning pipeline, body sheet metal, CCB pipe beam, steering wheel;

[0059] Path six is: water pump, body sheet metal, CCB tube beam, steering wheel. It can be understood that the CCB tube beam is the instrument panel cross beam.

[0060] Specifically, the water pump includes an engine cooling water pump, a HVAC water pump, a battery cooling water pump, and an electronically controlled cooling water pump.

[0061] In a specific embodiment, after obtaining the spectrum diagram of the abnormal shaking of the steering wheel, the frequency of the steering wheel at the maximum vibration peak, such as 40Hz, is obtained through order analysis; by analyzing the excitation orders of the engine cooling fan, blower, compressor, water pump, engine, etc., see Table 1, it is found that the excitation corresponding to the frequency at the maximum vibration peak of the steering wheel is the second-order excitation of the engine (the engine speed is 1200r / min under the condition of idling charging and air conditioning), and the steering wheel mode is 40Hz. It can be seen that under the condition of idling charging and air conditioning, the coupling of the second-order excitation frequency of the engine and the steering wheel mode is the main reason for the abnormal shaking of the steering wheel. Then, the vibration source is optimized, that is, the engine speed is adjusted under the condition of idling charging and air conditioning to solve this problem so that the second-order excitation frequency of the engine and the steering wheel mode are not at the same frequency.

[0062] Table 1 Speed ​​and excitation frequency of each vibration source during idling charging and air conditioning operation

[0063]

[0064] The order calculation of the engine when it is working is as follows:

[0065] ;

[0066] The excitation frequency when the engine is working is: ;

[0067] The order calculation of the engine cooling fan, blower, compressor, and water pump when they are working is as follows:

[0068] ;

[0069] The excitation frequency of the engine cooling fan, blower, compressor and water pump when working is: ;

[0070] Where N represents the speed of the engine, engine cooling fan, blower, compressor, and water pump, and K represents 1, 2, 3, and 4.

[0071] Since the vibration sources are the engine, engine cooling fan, blower, compressor, and water pump, the frequency corresponding to the steering wheel vibration peak in Table 2 is used to make a judgment and optimize the vibration source, so that the steering wheel vibration finally meets the target requirements.

[0072] Table 2 Related parameters of each vibration source during idle charging and air conditioning operation

[0073]

[0074] Preferably, the target requirement is set to be no greater than 0.03g, where g is the vibration acceleration.

[0075] The present invention tests and determines the frequency characteristics of steering wheel jitter during idling charging and air conditioning operation; confirms through analysis whether the steering wheel jitter meets the target requirements, and if not, continues with the following steps: determines the vibration frequency characteristics of the vibration source (engine, engine cooling fan, blower, compressor, water pump); determines the vibration source and components on the transmission path that are strongly correlated with the steering wheel jitter frequency characteristics; optimizes the steering wheel jitter problem during idling charging and air conditioning operation, and improves the steering wheel jitter level during idling charging and air conditioning operation of the entire vehicle, until the steering wheel jitter level meets the target requirements.

[0076] The present invention proposes a target requirement for steering wheel vibration when the vehicle is idling and charging and the air conditioner is turned on, as well as a method for troubleshooting and optimizing the vibration source and vibration transmission path after the target requirement is exceeded, so as to address the deficiencies in the prior art. It can quickly and accurately determine the root cause of the excessive steering wheel vibration when the vehicle is idling and charging and the air conditioner is turned on.

[0077] The present invention provides a method for judging the magnitude of steering wheel vibration when the air conditioner is turned on during idling charging, and provides a method for troubleshooting the cause when the steering wheel vibrates greatly, i.e., when the air conditioner is turned on during idling charging. By this method, the vibration source and related components generated by the steering wheel vibration when the air conditioner is turned on during idling charging can be quickly identified and optimized, and finally the steering wheel vibration when the air conditioner is turned on during idling charging can meet the target requirement, thereby improving the efficiency of solving the problem.

[0078] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for analyzing steering wheel vibration when a hybrid vehicle is idling and charging and the air conditioner is turned on, characterized in that: It includes the following steps: Step S1, confirming the jitter level: Test the steering wheel vibration of the hybrid vehicle when idling and charging with the air conditioner on. Analyze whether the steering wheel vibration level meets the set target requirements based on the test results. If not, the steering wheel has abnormal vibration and proceed to the next step. Step S2: confirm the frequency characteristics of abnormal jitter: Obtain the frequency spectrum of the steering wheel when it shakes abnormally, and confirm the frequency characteristics of the steering wheel when it shakes abnormally; Step S3: Test analysis: Test and analyze the vibration conditions of various vibration sources that cause steering wheel vibration during idling charging and air conditioning operation; Conduct vibration and modal test analysis on components on each vibration transmission path that causes steering wheel vibration during idling charging and air conditioning operation; Step S4, determine the cause of abnormal jitter and optimize: According to the test and analysis results in the previous step, determine the vibration source and vibration transmission path that causes abnormal steering wheel vibration; The determined vibration sources and vibration transmission paths are optimized so that the steering wheel vibration level meets the set target requirements.

2. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 1, characterized in that: In step S3, when the vibration conditions of each vibration source causing the steering wheel vibration are tested and analyzed, the obtained test and analysis results include the vibration magnitude and frequency of each vibration source.

3. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 2, characterized in that: In step S4, the method for determining the vibration source causing abnormal shaking of the steering wheel is: confirming whether the vibration magnitude and frequency peak of each vibration source are consistent with the frequency characteristics when the steering wheel shakes abnormally, and whether the vibration magnitude meets the requirements. If either of the two is no, then the vibration source is determined to be the vibration source causing abnormal shaking of the steering wheel.

4. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 1, characterized in that: When performing vibration and modal test analysis on components on the vibration transmission paths that cause steering wheel vibration, first determine the components that are strongly correlated with the steering wheel vibration frequency peak, then change the modal characteristics of each component, and then test whether the abnormal vibration frequency peak of the steering wheel is reduced after the modal characteristics of each component are changed. If so, optimize the vibration transmission path with the component.

5. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 1, characterized in that: The vibration sources that cause steering wheel vibration when idling and charging with air conditioning on include one or more of the following: engine, engine cooling fan, blower, compressor, and water pump.

6. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 5, characterized in that: The vibration transmission paths that cause steering wheel vibration during idling charging and air conditioning operation include one or more of the following: Path 1, in order: engine, suspension, body sheet metal, CCB tube beam, steering wheel; Path 2, in order: engine, air conditioning pipe, body sheet metal, CCB pipe beam, steering wheel; Path three, in order: engine cooling fan, front-end module, body sheet metal, CCB tube beam, steering wheel; Path 4, in order: blower, body sheet metal, CCB tube beam, steering wheel; Path 5, in order: compressor, air conditioning pipeline, body sheet metal, CCB pipe beam, steering wheel; Path six, in order: water pump, body sheet metal, CCB tube beam, steering wheel.

7. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to claim 6, characterized in that: The water pumps include an engine cooling water pump, a HVAC water pump, a battery cooling water pump, and an electronically controlled cooling water pump.

8. The method for analyzing steering wheel vibration of a hybrid vehicle during idling charging and air conditioning operation according to any one of claims 1 to 7, characterized in that: The target requirement is set to no more than 0.03g.

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