CN111691963B - Method and device for detecting dynamic balance of automobile fan - Google Patents
Method and device for detecting dynamic balance of automobile fan Download PDFInfo
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- CN111691963B CN111691963B CN202010520910.8A CN202010520910A CN111691963B CN 111691963 B CN111691963 B CN 111691963B CN 202010520910 A CN202010520910 A CN 202010520910A CN 111691963 B CN111691963 B CN 111691963B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
Abstract
The invention discloses a method and a device for detecting the dynamic balance of an automobile fan, which relate to the technical field of vehicles, and comprise the following steps: obtaining fan information under the running state of a vehicle, and calculating the dynamic balance of an automobile fan according to the fan information; judging whether the dynamic balance amount is smaller than a preset target value or not; and when the dynamic balance amount is smaller than the preset target value, judging that the dynamic balance of the automobile fan is qualified. According to the invention, the dynamic balance of the automobile fan is calculated according to the fan information, and then whether the dynamic balance is smaller than a preset target value is judged to judge whether the dynamic balance of the automobile fan is qualified or not, so that the detection result of the dynamic balance of the automobile fan is accurately obtained, and the detection efficiency of the dynamic balance of the automobile fan is improved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for detecting the dynamic balance of an automobile fan.
Background
Along with the rapid development of social economy and automobile industry, the application of automobiles is more and more common, the requirements of consumers on various performances of automobiles are higher and higher, the NVH problem of automobiles is more and more emphasized, the problem of whole automobile shake or beat frequency often occurs when a passenger automobile is in idling, particularly when the passenger automobile is started to be air-conditioned, the idling shake and beat frequency seriously affect the driving and riding comfort, the idling shake and beat frequency are related to a fan under a plurality of conditions when the air-conditioned is started, and if the dynamic balance of the fan does not reach the standard, the shake and beat frequency of an in-automobile steering wheel and a seat guide rail are often caused when the steering wheel and the seat guide rail are in idling. If the dynamic balance of the fan is measured by using equipment in the whole vehicle state, the fan needs to be detached and is taken to a special dynamic balancing machine of a manufacturer for testing.
In the prior art, the problem of shaking or beat frequency of an air conditioner when a whole vehicle runs at an idle speed is solved, if the dynamic balance of a fan needs to be determined to be the main reason causing shaking and beat frequency in the vehicle, the dynamic balance of the fan needs to be measured, the existing method is to detach the fan from the whole vehicle and then bring the fan to a dynamic balancing machine of a manufacturer for testing. However, in the whole vehicle state, the fan needs to be removed, the fan is taken to a manufacturer to perform fan dynamic balance detection, whether the fan dynamic balance on the vehicle meets the requirements or not is confirmed, the method is troublesome, the front-end module needs to be removed, the fan is taken out, the manufacturer is taken to perform testing, whether the requirements are met or not is judged according to the testing result, and the method is time-consuming and low in efficiency. Therefore, how to accurately obtain the detection result of the dynamic balance of the automobile fan to improve the detection efficiency of the dynamic balance of the automobile fan is an urgent technical problem to be solved.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method and a device for detecting the dynamic balance of an automobile fan, and aims to solve the technical problem of accurately acquiring the detection result of the dynamic balance of the automobile fan so as to improve the detection efficiency of the dynamic balance of the automobile fan.
In order to achieve the above object, the present invention provides a method for detecting the dynamic balance of an automobile fan, comprising the following steps:
obtaining fan information under the running state of a vehicle, and calculating the dynamic balance of an automobile fan according to the fan information;
judging whether the dynamic balance amount is smaller than a preset target value or not;
and when the dynamic balance amount is smaller than the preset target value, judging that the dynamic balance of the automobile fan is qualified.
Preferably, the fan information includes a fan mass and a fan target rotation speed;
the step of calculating the dynamic balance of the automobile fan according to the fan information comprises the following steps:
obtaining fan acceleration according to the fan mass and the fan target rotating speed;
and calculating the dynamic balance of the automobile fan according to the fan mass, the target rotating speed of the fan and the fan acceleration.
Preferably, the step of calculating the dynamic balance amount of the car fan according to the fan mass, the fan target rotation speed and the fan acceleration includes:
calculating the dynamic balance of the automobile fan through a preset dynamic balance formula according to the fan mass, the fan target rotating speed and the fan acceleration;
the preset dynamic balance formula is as follows:
W＝900Ma/(πn)2
in the formula, M is the mass of the fan, a is the acceleration of the fan, W is the dynamic balance of the automobile fan, and n is the target rotating speed of the fan.
Preferably, before the step of obtaining the fan acceleration according to the fan mass and the fan target rotation speed, the method further includes:
judging whether the target rotating speed of the fan is consistent with the rotating speed of the idling fan;
and when the target fan speed is consistent with the idle fan speed, executing the step of obtaining the fan acceleration according to the fan mass and the target fan speed.
Preferably, after the step of determining whether the dynamic balance amount is smaller than a preset target value, the method further includes:
and when the dynamic balance amount is greater than or equal to the preset target value, determining that the dynamic balance of the automobile fan is unqualified.
In addition, in order to achieve the above object, the present invention further provides a device for detecting a dynamic balance of an automotive fan, comprising:
the acquisition module is used for acquiring fan information under the running state of the vehicle and calculating the dynamic balance of the automobile fan according to the fan information;
the judging module is used for judging whether the dynamic balance amount is smaller than a preset target value or not;
and the judging module is used for judging that the dynamic balance of the automobile fan is qualified when the dynamic balance amount is smaller than the preset target value.
Preferably, the fan information includes a fan mass and a fan target rotation speed;
the acquisition module is further used for acquiring fan acceleration according to the fan mass and the fan target rotating speed;
the acquisition module is further used for calculating the dynamic balance of the automobile fan according to the fan mass, the target rotating speed of the fan and the fan acceleration.
Preferably, the obtaining module is further configured to calculate a dynamic balance of the automobile fan through a preset dynamic balance formula according to the fan mass, the target fan rotation speed, and the fan acceleration;
the preset dynamic balance formula is as follows:
W＝900Ma/(πn)2
in the formula, M is the mass of the fan, a is the acceleration of the fan, W is the dynamic balance of the automobile fan, and n is the target rotating speed of the fan.
Preferably, the obtaining module is further configured to determine whether the target fan speed is consistent with an idle fan speed;
the obtaining module is further configured to execute the operation of obtaining the fan acceleration according to the fan mass and the fan target rotational speed when the fan target rotational speed is consistent with the idle fan rotational speed.
Preferably, the determination module is further configured to determine that the dynamic balance of the automobile fan is not qualified when the dynamic balance amount is greater than or equal to the preset target value.
The method comprises the steps of firstly obtaining fan information under the running state of a vehicle, calculating the dynamic balance of the automobile fan according to the fan information, then judging whether the dynamic balance is smaller than a preset target value, and finally judging that the dynamic balance of the automobile fan is qualified when the dynamic balance is smaller than the preset target value. By the above mode, whether the dynamic balance amount is smaller than a preset target value or not is judged, and when the dynamic balance amount is smaller than the preset target value, the dynamic balance of the automobile fan is judged to be qualified, so that the detection result of the dynamic balance of the automobile fan is accurately obtained, and the detection efficiency of the dynamic balance of the automobile fan is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the dynamic balance of a vehicle fan according to a first embodiment of the present invention;
fig. 2 is a block diagram of a first embodiment of the detecting device for detecting the dynamic balance of the fan of the automobile according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for detecting a dynamic balance of an automobile fan according to a first embodiment of the present invention.
In a first embodiment, the method for detecting the dynamic balance of the automobile fan comprises the following steps:
step S10: and obtaining fan information under the running state of the vehicle, and calculating the dynamic balance of the automobile fan according to the fan information.
It should be noted that the execution subject of this embodiment is the detection device for detecting the dynamic balance of the automobile fan, where the detection device for detecting the dynamic balance of the automobile fan may calculate the dynamic balance amount of the automobile fan according to the fan information, and determine whether the dynamic balance amount is smaller than a preset target value, or may be other devices, which is not limited in this embodiment.
The step of calculating the dynamic balance of the automobile fan according to the fan information comprises the steps of obtaining fan acceleration according to the fan mass and the fan target rotating speed, and calculating the dynamic balance of the automobile fan according to the fan mass, the fan target rotating speed and the fan acceleration.
And calculating the dynamic balance of the automobile fan through a preset dynamic balance formula according to the fan mass, the fan target rotating speed and the fan acceleration.
The preset dynamic balance formula is as follows:
W＝900Ma/(πn)2
wherein M is the mass (kg) of the fan, and a is the acceleration (M/s) of the fan2) W is the dynamic balance (g.mm) of the automobile fan, and n is the target rotating speed (r/min) of the fan.
Before the step of obtaining the fan acceleration according to the fan mass and the fan target rotating speed, judging whether the fan target rotating speed is consistent with the idling fan rotating speed, and when the fan target rotating speed is consistent with the idling fan rotating speed, executing the step of obtaining the fan acceleration according to the fan mass and the fan target rotating speed.
And within a preset time threshold, acquiring the initial rotating speed of the fan, calculating the average rotating speed value according to the initial rotating speed of the fan, and taking the average rotating speed value as the target rotating speed of the fan.
The preset duration threshold is a user-defined set duration, which may be 19s or 29s, and the embodiment is not limited.
That is, the mass and the rotation speed of the fan are obtained, the acceleration of the fan is made to be that the vibration sensor is attached to the center of the fan under the state of the whole vehicle, then the stabilized voltage power supply is used for supplying power to the fan, the voltage of the stabilized voltage power supply is adjusted to enable the rotation speed of the fan to be consistent with the rotation speed of the idle-speed air-conditioning fan, and then the vibration acceleration (x, y, z) of the fan in three directions in the center is measured through the vibration sensor, wherein the acceleration is accelerated
And finally, calculating the dynamic balance of the automobile fan according to the fan mass, the target rotating speed of the fan and the fan acceleration.
It can be understood that the dynamic balance of the automobile fan is calculated by using a newton's law of mechanics formula, where mr is Ma/w2＝Ma/(2πn/60)2＝900Ma/(πn)2Wherein r is the distance from the blade tip to the fan rotorThe distance between the centers of rotation (M), i.e., the radius of the fan blades, w is the angular velocity of the fan (rad/s), M is the mass of the fan (kg), and a is the acceleration of the fan (M/s)2) Mr (i.e., W) is the dynamic balance (g.mm) of the fan.
Step S20: and judging whether the dynamic balance amount is smaller than a preset target value or not.
Step S30: and when the dynamic balance amount is smaller than the preset target value, judging that the dynamic balance of the automobile fan is qualified.
The preset target value is a standard dynamic balance amount corresponding to the automobile fan, that is, when the dynamic balance amount is smaller than the preset target value, the dynamic balance of the automobile fan is judged to be qualified, so that the condition that the shaking or beat frequency of the air conditioner is caused by the dynamic balance of the fan when the automobile is in idle running can be eliminated.
And when the dynamic balance amount is greater than or equal to the preset target value, determining that the dynamic balance of the automobile fan is unqualified, so that the phenomenon that the idling air conditioner in the automobile shakes or the beat frequency is caused by the dynamic balance of the fan is not eliminated.
For ease of understanding, the following is exemplified:
if the beat frequency phenomenon exists when the air conditioner is started at the idle speed of a certain vehicle, whether the dynamic balance of the fan meets the design requirement is confirmed through the method.
The rotating speed of the fan of the idle-speed air-conditioning is 1740r/min, the mass M of the fan is 4.03kg, and the rotating speed of the fan is 1740r/min by supplying power through a stabilized voltage power supply in the state of a whole vehicle, wherein y is 0.179M/s2，z＝0.244m/s2The formula for solving the dynamic balance of the automobile fan is as follows:
it is found that the actual measured value of the fan dynamic balance is 36.8g · mm, and the preset target value is 25g · mm, and therefore, the actual measured value of the fan dynamic balance is larger than the preset target value (25g · mm), and it is determined that the dynamic balance of the automobile fan is not good.
In this embodiment, fan information in a vehicle running state is first acquired, a dynamic balance of an automobile fan is calculated according to the fan information, then whether the dynamic balance is smaller than a preset target value or not is judged, and finally when the dynamic balance is smaller than the preset target value, it is judged that the dynamic balance of the automobile fan is qualified. By the above mode, whether the dynamic balance amount is smaller than a preset target value or not is judged, and when the dynamic balance amount is smaller than the preset target value, the dynamic balance of the automobile fan is judged to be qualified, so that the detection result of the dynamic balance of the automobile fan is accurately obtained, and the detection efficiency of the dynamic balance of the automobile fan is improved.
In addition, referring to fig. 2, an embodiment of the present invention further provides a device for detecting a dynamic balance of an automotive fan, where the device for detecting a dynamic balance of an automotive fan includes: the obtaining module 2001 is used for obtaining fan information under a vehicle running state and calculating the dynamic balance of the automobile fan according to the fan information; a determining module 2002, configured to determine whether the dynamic balance amount is smaller than a preset target value; and the judging module 2003 is used for judging that the dynamic balance of the automobile fan is qualified when the dynamic balance amount is smaller than the preset target value.
The obtaining module 2001 is configured to obtain fan information in a vehicle running state, and calculate a dynamic balance of an automobile fan according to the fan information.
It should be noted that the execution subject of this embodiment is the detection device for detecting the dynamic balance of the automobile fan, where the detection device for detecting the dynamic balance of the automobile fan may calculate the dynamic balance amount of the automobile fan according to the fan information, and determine whether the dynamic balance amount is smaller than a preset target value, or may be other devices, which is not limited in this embodiment.
The step of calculating the dynamic balance of the automobile fan according to the fan information comprises the steps of obtaining fan acceleration according to the fan mass and the fan target rotating speed, and calculating the dynamic balance of the automobile fan according to the fan mass, the fan target rotating speed and the fan acceleration.
And calculating the dynamic balance of the automobile fan through a preset dynamic balance formula according to the fan mass, the fan target rotating speed and the fan acceleration.
The preset dynamic balance formula is as follows:
W＝Ma/(2πn/60)2＝900Ma/(πn)2
wherein M is the mass (kg) of the fan, and a is the acceleration (M/s) of the fan2) W is the dynamic balance (g.mm) of the automobile fan, and n is the target rotating speed (r/min) of the fan.
Before the step of obtaining the fan acceleration according to the fan mass and the fan target rotating speed, judging whether the fan target rotating speed is consistent with the idling fan rotating speed, and when the fan target rotating speed is consistent with the idling fan rotating speed, executing the step of obtaining the fan acceleration according to the fan mass and the fan target rotating speed.
And within a preset time threshold, acquiring the initial rotating speed of the fan, calculating the average rotating speed value according to the initial rotating speed of the fan, and taking the average rotating speed value as the target rotating speed of the fan.
The preset duration threshold is a user-defined set duration, which may be 19s or 29s, and the embodiment is not limited.
That is, the mass and the rotation speed of the fan are obtained, the acceleration of the fan is made to be that the vibration sensor is attached to the center of the fan under the state of the whole vehicle, then the stabilized voltage power supply is used for supplying power to the fan, the voltage of the stabilized voltage power supply is adjusted to enable the rotation speed of the fan to be consistent with the rotation speed of the idle-speed air-conditioning fan, and then the vibration acceleration (x, y, z) of the fan in three directions in the center is measured through the vibration sensor, wherein the acceleration is accelerated
And finally, calculating the dynamic balance of the automobile fan according to the fan mass, the target rotating speed of the fan and the fan acceleration.
It can be understood that the dynamic balance of the automobile fan is calculated by using the Newton's law equation that F is mrw2Ma or mr Ma/w2＝Ma/(2πn/60)2＝900Ma/(πn)2Wherein r is a distance (M) from the tip of the fan to the rotation center of the fan, i.e., a radius of the fan blade, w is an angular velocity (rad/s) of the fan, M is a mass (kg) of the fan, and a is an acceleration (M/s) of the fan2) Mr (i.e., W) is the dynamic balance (g.mm) of the fan.
The determining module 2002 is configured to determine whether the dynamic balance amount is smaller than a preset target value.
The determining module 2003 is configured to determine that the dynamic balance of the automobile fan is qualified when the dynamic balance amount is smaller than the preset target value.
The preset target value is a standard dynamic balance amount corresponding to the automobile fan, that is, when the dynamic balance amount is smaller than the preset target value, the dynamic balance of the automobile fan is judged to be qualified, so that the condition that the shaking or beat frequency of the air conditioner is caused by the dynamic balance of the fan when the automobile is in idle running can be eliminated.
And when the dynamic balance amount is greater than or equal to the preset target value, determining that the dynamic balance of the automobile fan is unqualified, so that the phenomenon that the idling air conditioner in the automobile shakes or the beat frequency is caused by the dynamic balance of the fan is not eliminated.
For ease of understanding, the following is exemplified:
if the beat frequency phenomenon exists when the air conditioner is started at the idle speed of a certain vehicle, whether the dynamic balance of the fan meets the design requirement is confirmed through the method.
The rotating speed of the fan of the idle-speed air-conditioning is 1740r/min, the mass M of the fan is 4.03kg, and the rotating speed of the fan is 1740r/min by supplying power through a stabilized voltage power supply in the state of a whole vehicle, wherein y is 0.179M/s2，z＝0.244m/s2The formula for solving the dynamic balance of the automobile fan is as follows:
it is found that the actual measured value of the fan dynamic balance is 36.8g · mm, and the preset target value is 25g · mm, and therefore, the actual measured value of the fan dynamic balance is larger than the preset target value (25g · mm), and it is determined that the dynamic balance of the automobile fan is not good.
In this embodiment, fan information in a vehicle running state is first acquired, a dynamic balance of an automobile fan is calculated according to the fan information, then whether the dynamic balance is smaller than a preset target value or not is judged, and finally when the dynamic balance is smaller than the preset target value, it is judged that the dynamic balance of the automobile fan is qualified. By the above mode, whether the dynamic balance amount is smaller than a preset target value or not is judged, and when the dynamic balance amount is smaller than the preset target value, the dynamic balance of the automobile fan is judged to be qualified, so that the detection result of the dynamic balance of the automobile fan is accurately obtained, and the detection efficiency of the dynamic balance of the automobile fan is improved.
Other embodiments or specific implementation manners of the detection device for detecting the dynamic balance of the automobile fan can refer to the above method embodiments, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The method for detecting the dynamic balance of the automobile fan is characterized by comprising the following steps of:
obtaining fan information under the running state of a vehicle, and calculating the dynamic balance of an automobile fan according to the fan information;
judging whether the dynamic balance amount is smaller than a preset target value or not;
when the dynamic balance amount is smaller than the preset target value, judging that the dynamic balance of the automobile fan is qualified;
the fan information comprises fan quality and a fan target rotating speed, and the fan target rotating speed is the average rotating speed of the fan within a preset time threshold;
the step of calculating the dynamic balance of the automobile fan according to the fan information comprises the following steps:
obtaining fan acceleration according to the fan mass and the fan target rotating speed;
calculating the dynamic balance of the automobile fan according to the fan mass, the fan target rotating speed and the fan acceleration;
before the step of obtaining the fan acceleration according to the fan mass and the fan target rotating speed, the method further comprises the following steps:
judging whether the target rotating speed of the fan is consistent with the rotating speed of the idling fan;
and when the target fan speed is consistent with the idle fan speed, executing the step of obtaining the fan acceleration according to the fan mass and the target fan speed.
2. The method of claim 1, wherein said step of calculating a dynamic balance of a vehicle fan based on said fan mass, said fan target speed, and said fan acceleration comprises:
calculating the dynamic balance of the automobile fan through a preset dynamic balance formula according to the fan mass, the fan target rotating speed and the fan acceleration;
the preset dynamic balance formula is as follows:
W＝900Ma/(πn)2
in the formula, M is the mass of the fan, a is the acceleration of the fan, W is the dynamic balance of the automobile fan, and n is the target rotating speed of the fan.
3. The method of claim 1, wherein said step of determining whether said dynamic balance mass is less than a predetermined target value is followed by the step of:
and when the dynamic balance amount is greater than or equal to the preset target value, determining that the dynamic balance of the automobile fan is unqualified.
4. A detection device for detecting the dynamic balance of an automobile fan is characterized by comprising:
the acquisition module is used for acquiring fan information under the running state of the vehicle and calculating the dynamic balance of the automobile fan according to the fan information;
the judging module is used for judging whether the dynamic balance amount is smaller than a preset target value or not;
the judging module is used for judging that the dynamic balance of the automobile fan is qualified when the dynamic balance amount is smaller than the preset target value;
the fan information comprises fan quality and a fan target rotating speed, and the fan target rotating speed is the average rotating speed of the fan within a preset time threshold;
the acquisition module is further used for acquiring fan acceleration according to the fan mass and the fan target rotating speed;
the acquisition module is further used for calculating the dynamic balance of the automobile fan according to the fan mass, the fan target rotating speed and the fan acceleration;
the obtaining module is further used for judging whether the target rotating speed of the fan is consistent with the rotating speed of the idling fan;
the obtaining module is further configured to execute the operation of obtaining the fan acceleration according to the fan mass and the fan target rotational speed when the fan target rotational speed is consistent with the idle fan rotational speed.
5. The device of claim 4, wherein the obtaining module is further configured to calculate a dynamic balance of the automotive fan according to the fan mass, the fan target rotational speed, and the fan acceleration by using a preset dynamic balance formula;
the preset dynamic balance formula is as follows:
W＝900Ma/(πn)2
in the formula, M is the mass of the fan, a is the acceleration of the fan, W is the dynamic balance of the automobile fan, and n is the target rotating speed of the fan.
6. The apparatus of claim 4, wherein the determining module is further configured to determine that the dynamic balance of the car fan is not qualified when the dynamic balance amount is greater than or equal to the preset target value.
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