CN109540512B - Method for detecting number of teeth at flywheel end with unknown structure - Google Patents
Method for detecting number of teeth at flywheel end with unknown structure Download PDFInfo
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- CN109540512B CN109540512B CN201811445578.2A CN201811445578A CN109540512B CN 109540512 B CN109540512 B CN 109540512B CN 201811445578 A CN201811445578 A CN 201811445578A CN 109540512 B CN109540512 B CN 109540512B
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Abstract
The invention discloses a method for detecting the number of teeth at a flywheel end with an unknown structure, which comprises the following steps: under the steady-state working condition of the automobile, acquiring a first voltage periodic pulse signal acquired by a flywheel end magnetoelectric sensor and a second voltage periodic pulse signal acquired by a crankshaft sensor; and calculating the number of teeth of the first flywheel end according to the number Y of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals, and carrying out validity judgment on the number of teeth of the first flywheel end to obtain the final number of teeth of the flywheel end. The method can conveniently and accurately obtain the number of teeth at the flywheel end.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method for detecting the number of teeth at a flywheel end with an unknown structure.
Background
Torsional vibration of an automobile power transmission system endangers the service life, riding comfort and even personal safety of an automobile, and becomes a key research topic in the automobile field. The torsional vibration test is an important basis for the research of torsional vibration problems, and when a general host factory carries out the special torsional vibration research of an automobile power transmission system, the torsional vibration of the automobile power transmission system of the company is tested, and the torsional vibration of the flywheel end of a standard pole/competitive product automobile type is required to be tested as reference. The number of teeth of the flywheel end gear is a key parameter for processing the torsional vibration data of the flywheel end, but the number of teeth of the flywheel end gear of the bidding post/bidding article is generally confidential information of each host factory, and is extremely difficult to obtain, so that the difficulty is brought to the torsional vibration data processing of the flywheel end of the bidding post/bidding article.
In the prior art, the number of teeth at the flywheel end is confirmed by continuously debugging mainly an L MS Test L ab Signature Acquisition software TrackingSetup module.
The method for confirming the number of teeth at the flywheel end in the prior art is high in subjectivity, needs engineers in relevant fields with certain engineering experience to carry out debugging and confirmation, and is difficult to guarantee precision.
Disclosure of Invention
One object of the present invention is to provide a method for detecting the number of teeth at the flywheel end of an unknown structure, which can solve the disadvantages of the prior art and can facilitate the determination of the number of teeth at the flywheel end of a test vehicle.
The invention provides a method for detecting the number of teeth at a flywheel end with an unknown structure, which comprises the following steps:
s1, under the steady-state working condition of the automobile, acquiring a first voltage periodic pulse signal acquired by a flywheel end magnetoelectric sensor and a second voltage periodic pulse signal acquired by a crankshaft sensor;
s2, according to
Calculating the number of teeth at the first flywheel end; validity judgment is carried out on the number of teeth at the first flywheel end, and the final number of teeth at the flywheel end is obtained;
wherein N is the number of teeth at the flywheel end;
y is the number of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals;
x is the number of second voltage period pulse signals corresponding to the Y first voltage period pulse signals;
n is the number of the second voltage periodic pulse signals generated per crankshaft revolution.
The method for detecting the number of teeth at the flywheel end with unknown structure as described above, optionally, n is determined by the number of cylinders and the number of strokes of the engine.
The method for detecting the number of teeth at the flywheel end with the unknown structure as described above optionally includes the following specific steps:
s101, keeping the automobile in an idle state for a preset time;
s102, a first voltage periodic pulse signal of the flywheel end magnetoelectric sensor and a second voltage periodic pulse signal collected by the crankshaft sensor are collected simultaneously.
According to the method for detecting the number of teeth at the end of a flywheel with an unknown structure, optionally, in step S102, the second voltage periodic pulse signal is collected through an OBD interface of the entire vehicle.
In the method for detecting the number of teeth at the end of a flywheel of unknown structure, optionally, the number of the second voltage periodic pulse signals in step S2 is greater than or equal to 8.
In the method for detecting the number of teeth at the flywheel end with unknown structure, optionally, the number of the second voltage periodic pulse signals in the step S2 is 10-50.
The method for detecting the number of teeth at the flywheel end with the unknown structure as described above optionally further includes the following steps:
s3, repeating the step S1 and the step S2 to obtain a plurality of final flywheel end tooth numbers;
and S4, averaging the obtained plurality of final flywheel end tooth numbers.
The method for detecting the number of teeth at the flywheel end of the unknown structure as described above optionally includes the following steps in step S2:
s201, according to
Calculating the number of teeth at the first flywheel end;
s202, if the decimal part of the tooth number of the first flywheel end is between q and 1-q, the tooth number of the first flywheel end obtained in the step S201 is abnormal, and the step S1 is returned; otherwise, taking an integral part of the number of teeth at the first flywheel end or adding one to the integral part of the number of teeth at the first flywheel end as the final number of teeth at the flywheel end;
wherein q is greater than 0 and less than 0.2.
Optionally, in step S202, if the decimal part of the first flywheel end tooth number is less than q, the integer part of the first flywheel end tooth number calculated in S201 is taken as the final flywheel end tooth number; and if the decimal part of the number of teeth at the first flywheel end is between 1-q and 1, adding one to the integer part of the number of teeth at the first flywheel end calculated in the step S201 to obtain the final number of teeth at the flywheel end.
Compared with the prior art, the number of teeth at the flywheel end is calculated through the relation between the second voltage periodic pulse signal acquired by the crankshaft sensor and the first voltage periodic pulse signal acquired by the corresponding magnetoelectric sensor at the flywheel end. The method is simple to operate, has less requirements on experience of operators, and is more accurate in test.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart of the steps of a method for detecting the number of teeth at a flywheel end of unknown configuration proposed by the present disclosure;
FIG. 2 is a flow chart of the specific steps in step 1 of the present disclosure;
fig. 3 is a flowchart of specific steps in step 2 of the present disclosure.
Detailed Description
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 the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
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.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 to 3, the present disclosure provides a method for detecting the number of teeth at a flywheel end with an unknown structure, wherein the method comprises the following steps:
and S1, under the steady-state working condition of the automobile, acquiring a first voltage periodic pulse signal acquired by a flywheel end magnetoelectric sensor and a second voltage periodic pulse signal acquired by a crankshaft sensor. S2, calculating the number of teeth at the first flywheel end according to the number Y of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals.
Because flywheel end magnetoelectric sensor is hall formula magnetoelectric sensor, when every tooth passes through hall formula sensor, will produce a voltage pulse signal, be exactly the first voltage cycle pulse signal that says in this application, when the flywheel passes a week, the quantity of the first voltage cycle pulse signal who produces is the same with the number of teeth. And the second voltage periodic pulse signal is collected by a crankshaft sensor, when the flywheel rotates for one circle, the crankshaft also rotates for one circle, and n second voltage periodic pulse signals are generated. Therefore, the number of the flywheel end teeth can be determined according to the fact that the flywheel rotating speed is equal to the crankshaft rotating speed, and the calculated number of the flywheel end teeth is recorded as the first number of the flywheel end teeth, namely:
Y/N＝X/n；
n is the number of teeth at the flywheel end, N is the number of second voltage periodic pulse signals generated by one-circle rotation of the crankshaft, validity judgment is carried out on the number of teeth at the first flywheel end, and the final number of teeth at the flywheel end is obtained;
when the method is specifically implemented, the whole vehicle is in a steady-state working condition to ensure that the rotation of the engine is kept unchanged as much as possible. And calculating the number of teeth at the first flywheel end by using the number Y of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals. Therefore, the operation is simple, the accuracy does not depend on the experience of operators, and the test precision is improved.
In a specific implementation, the calculation formula of the number of teeth at the first flywheel end in S2 is as follows:
y is the number of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals; x is the number of second voltage period pulse signals corresponding to the Y first voltage period pulse signals; n is the number of the second voltage periodic pulse signals generated per crankshaft revolution. Specifically, n is determined by the cylinder number and the stroke of the engine, and the value of n is 2 times of the cylinder number of the engine divided by the stroke number, at present, most of automobile engines are four-stroke engines, and most of motorcycle engines are two-stroke engines.
Taking a 1.5T +6MT vehicle model flywheel end torsional vibration test equipped with a 4-cylinder four-stroke engine as an example, 22 second voltage periodic pulse signals are read, 1462 periodic signals are collected by a flywheel end magnetoelectric sensor in a corresponding time interval, and then the number of flywheel end gear teeth N is 2 × 1462/22 is 132.91, and the number of flywheel end gear teeth of the test vehicle is determined to be 133.
Optionally, specifically, the step S1 includes the following specific steps:
s101, enabling the automobile to be in an idling state and keeping the automobile for a preset time; in specific implementation, the automobile can be in an idling state and an air conditioner is started. The idle state is used as a test state, the rotating speed in the idle state is low, and the number of the first voltage period pulse signals and the number of the second voltage period pulse signals are convenient to obtain. S102, a first voltage periodic pulse signal of the flywheel end magnetoelectric sensor and a second voltage periodic pulse signal collected by the crankshaft sensor are collected simultaneously. Meanwhile, the acquisition is convenient to ensure the correspondence between the first voltage periodic pulse signal and the second voltage periodic pulse signal, and the reduction of errors caused by the change of the rotating speed of the engine is facilitated.
Optionally, in step S102, the second voltage periodic pulse signal is collected through an OBD interface of the entire vehicle. Therefore, the second voltage periodic pulse signal can be conveniently acquired, and the CANTacho can be utilized for reading during actual operation.
Alternatively, the number of the second voltage period pulse signals in step S1 is greater than or equal to 8. Further, the number of the second voltage period pulse signals in step S1 is 10 to 50. Therefore, the more the number of the selected second voltage periodic pulse signals is, the more accurate the calculation is.
Optionally, the method for detecting the number of teeth at the flywheel end with the unknown structure further comprises the following steps:
and S3, repeating the step S1 and the step S2 to obtain a plurality of final flywheel end tooth numbers. And S4, averaging the obtained plurality of final flywheel end tooth numbers. Thus, it can contribute to reduction of errors.
Optionally, the step S2 specifically includes the following steps:
s201, calculating the number of teeth at the first flywheel end. S202, if the decimal part of the tooth number of the first flywheel end is between q and 1-q, the tooth number of the first flywheel end obtained in the step S201 is abnormal, and the step S1 is returned; and otherwise, taking the integral part of the number of teeth at the first flywheel end or taking the integral part of the number of teeth at the first flywheel end plus one to serve as the final number of teeth at the flywheel end. Wherein q is greater than 0 and less than 0.2. q is a plurality of values, such as 0.1, 0.12, 0.15, 0.18 and the like. Specifically, in step S202, if the decimal part of the first flywheel end tooth number is less than q, the integer part of the first flywheel end tooth number calculated in step S201 is taken as the final flywheel end tooth number; and if the decimal part of the number of teeth at the first flywheel end is between 1-q and 1, adding one to the integer part of the number of teeth at the first flywheel end calculated in the step S201 to obtain the final number of teeth at the flywheel end.
When q is 0.1, also in the above-mentioned 1.5T +6MT vehicle model equipped with a 4-cylinder four-stroke engine, 22 periodic pulse signals are read, 1462 periodic signals are collected by the magneto-electric sensor at the flywheel end in the corresponding time interval, the number of teeth N of the flywheel end gear is 2 × 1462/22 — 132.91, and the fractional part 0.91 of the calculation result is compared with 0.1 and 0.9(1-q), respectively, because 0.91 is not between 0.1-0.9, and 132+1 is used as the final number of teeth of the flywheel end. I.e. the final flywheel end tooth count is 133.
When q is 0.1, if the number of teeth of the flywheel end gear obtained in step S201 is 133.18, the fractional part 0.18 of the result is taken and compared with 0.1 and 0.9(1-q), respectively, and since 0.18 is between 0.1 and 0.9, the result is rejected as abnormal data. This calculation is invalidated.
When q is 0.1, if the calculation result in step S201 is 133.09, the fractional part of the result is 0.09, and 0.09 is compared with 0.1 and 0.9(1-q), respectively, because 0.09 is not between 0.1 and 0.9, the integer part 133 is taken as the final flywheel end tooth number. I.e. the final flywheel end tooth count is 133.
When q is 0.1, if the number of teeth of the flywheel end gear obtained in step S201 is 132.82, the fractional part 0.82 of the result is taken and compared with 0.1 and 0.9(1-q), respectively, and since 0.81 is between 0.1 and 0.9, the result is rejected as abnormal data. This calculation is invalidated.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (4)
1. A method for detecting the number of teeth at the flywheel end with an unknown structure is characterized by comprising the following steps:
s1, under the steady-state working condition of the automobile, acquiring a first voltage periodic pulse signal acquired by a flywheel end magnetoelectric sensor and a second voltage periodic pulse signal acquired by a crankshaft sensor;
s2, according to
Calculating the number of teeth at the initial flywheel end, and judging the effectiveness of the number of teeth at the initial flywheel end to obtain the number of teeth at the final flywheel end;
wherein N is the number of teeth at the initial flywheel end;
y is the number of the first voltage periodic pulse signals corresponding to the X second voltage periodic pulse signals;
x is the number of second voltage period pulse signals corresponding to the Y first voltage period pulse signals;
n is the number of second voltage periodic pulse signals generated in each rotation of the crankshaft;
step S2 specifically includes the following steps:
s201, according to
Calculating the number of teeth at the initial flywheel end;
s202, if the decimal part of the initial flywheel end tooth number is between q and 1-q, executing step S1 and step S201; otherwise, taking an integral part of the initial flywheel end tooth number or taking the integral part of the initial flywheel end tooth number plus one to be used as the final flywheel end tooth number;
wherein q is greater than 0 and less than 0.2; in step S202, if the decimal part of the initial flywheel end tooth number is less than q, the integer part of the initial flywheel end tooth number calculated in step S201 is taken as the final flywheel end tooth number; if the decimal part of the initial flywheel end tooth number is between 1-q and 1, taking the integral part of the initial flywheel end tooth number calculated in the step S201 and adding one to be used as the final flywheel end tooth number;
the number of the second voltage period pulse signals in the step S1 is greater than or equal to 8;
the number of the second voltage periodic pulse signals in the step S1 is 10-50;
the method for detecting the number of teeth at the flywheel end with the unknown structure further comprises the following steps:
s3, looping step S1 and step S2;
s4, calculating the average value of the initial flywheel end tooth number obtained in the S3 to obtain the final flywheel end tooth number;
the number of cycles in step S3 is 10 to 50.
2. The method for detecting the number of teeth at the flywheel end of unknown configuration as claimed in claim 1, wherein n is determined by the number of cylinders and the number of strokes of the engine.
3. The method for detecting the number of end teeth of a flywheel of unknown structure according to claim 1, wherein the step S1 includes the following steps:
s101, keeping the automobile in an idle state for a preset time;
s102, collecting a first voltage periodic pulse signal of a flywheel end magnetoelectric sensor and a second voltage periodic pulse signal collected by a crankshaft sensor.
4. The method according to claim 3, wherein in step S102, said second voltage periodic pulse signal is collected through an OBD interface of the entire vehicle.
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