CN110530618B - Torque measuring device and method for power system - Google Patents

Torque measuring device and method for power system Download PDF

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CN110530618B
CN110530618B CN201910704158.XA CN201910704158A CN110530618B CN 110530618 B CN110530618 B CN 110530618B CN 201910704158 A CN201910704158 A CN 201910704158A CN 110530618 B CN110530618 B CN 110530618B
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torque
dynamometer
measured
power system
rotating speed
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CN110530618A (en
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刘兵
杨建伟
黄勇成
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Xian Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0042—Force sensors associated with force applying means applying a torque
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0061—Force sensors associated with industrial machines or actuators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts

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  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Testing Of Engines (AREA)

Abstract

The invention relates to a torque measuring device and method of a power system, which comprises a dynamometer, a control system and a measured power system, wherein the dynamometer can be connected with the measured power system, and an inertia flywheel is arranged on the dynamometer; the control system is used for controlling the dynamometer to operate, obtaining the measured loss torque and the corresponding rotating speed measured value, and correcting the measured loss torque. After the method is used for correcting the measured torque, the influence of the inertia of other rotating parts except the rotating part of the output shaft of the engine and the friction resistance of the system on the measurement can be effectively eliminated, and the test precision can be effectively improved; after the torque correction method is applied, the torque deviation caused by inertia increase can be effectively eliminated while the rotating inertia of the test system is increased and the working condition control precision is improved, and the measurement precision is improved, so that the working condition control precision and the torque measurement precision can be improved simultaneously.

Description

Torque measuring device and method for power system
Technical Field
The invention belongs to the technical field of torque measurement, and particularly relates to a device and a method for measuring torque of a power system.
Background
The torque measurement of the power system is the most important test content in the test of the power system, the torque measurement of the power system is generally carried out by a dynamometer, the measurement system comprises the dynamometer, a controller, a main control computer and a tested power system, during measurement, a main shaft of the dynamometer, a coupling and an output shaft of the power system jointly form a rotating system, and the dynamometer carries out the torque measurement of the power system by measuring the rotating torque of the output shaft of the power system.
The existing power unit torque measuring devices are typically dynamometers. During testing, a motor (alternating current or direct current) or an eddy current dynamometer is connected with an output shaft of a tested power unit through an output shaft, the torque of the tested power unit is measured through a torque sensor arranged on the motor (or the eddy current dynamometer), a motor rotor and the output shaft (or the eddy current output shaft) are connected with the tested power unit to form an integral rotating body during testing, the system is used for measuring the torque transmitted through the rotating body, but the motor rotor and the output shaft (or the eddy current dynamometer output shaft) have influence on a measuring result due to the existence of self rotational inertia and friction resistance.
When the dynamometer is used for measuring the torque of the power system, a part of torque loss is caused due to the inertia and the frictional resistance of a rotary system of the dynamometer. In addition, when the working condition is unstable under a given working condition due to the control of the power system, the torque fluctuation of the measured power system is large in the measuring process, and the precise control of the working condition is difficult to realize.
Therefore, a method for effectively improving the control precision and the torque measurement precision of the test working condition of the power system is lacked at present, and the control of the given working condition and the torque measurement are more accurately carried out during the test of the power system.
Disclosure of Invention
The invention aims to provide a device and a method for measuring torque of a power system, aiming at the defects in the prior art, so that the working condition control precision and the torque measurement precision can be effectively improved, and the cost is low.
In order to solve the technical problems, the method adopts the technical scheme that:
the method comprises the following steps:
step one, controlling a dynamometer to operate until the rotating speed is stable, and measuring a plurality of groups of loss torques Me _ l and corresponding rotating speeds n;
step two, processing the loss torque Me _ l and the corresponding rotating speed n by adopting a point-by-point correction method or a formula correction method to obtain a correction torque Me _ c;
and step three, controlling the dynamometer to drive the tested power system to operate, measuring the actually-measured torque Me _ m, and obtaining the output torque Me according to the corrected torque Me _ c and the actually-measured torque Me _ m.
Further, in the first step, when a rotating shaft system consisting of the dynamometer (3) and the tested power system (7) is unstable in operation, the rotational inertia is increased; and judging whether the rotating shaft system operates stably or not through the deviation of the actual measurement torque value in the T measurement time and the average torque value in the measurement time.
Further, the conditions for determining whether the rotation axis system is operating stably are: to be provided with
Figure BDA0002151622020000023
Representing a series of torque values measured in T measuring time at a certain rotating speed, and N is the torque measured in T measuring timeNumber of times in Me-aRepresenting the average value of the torque at a certain speed over time T measured in Me-vIndicating the amount of torque change corresponding to a certain rotational speed point to
Figure BDA0002151622020000021
Representing the torque ripple rate, then:
Figure BDA0002151622020000022
Figure BDA0002151622020000034
Figure BDA0002151622020000031
with Me-a-lOr
Figure BDA0002151622020000032
Represents the maximum torque deviation value or the maximum torque fluctuation rate allowed by the test at Me-a≤Me-a-lOr
Figure BDA0002151622020000033
And judging that the rotating shaft system operates stably, otherwise, judging that the rotating shaft system is unstable.
Further, in the point-by-point correction method of step two, Me _ c is Me _ l.
Further, in the formula correction method of step two, the correction torque Me _ c is obtained by a correction formula, where Me _ c is f (Me _ l, n).
Further, the correction formula is obtained by a least square method, a linear regression method, a logarithm method, a polynomial method, a power method, an exponential method or a moving average method.
The technical scheme of the device is as follows: the system comprises a dynamometer, a control system and a tested power system, wherein the dynamometer can be connected with the tested power system, and an inertia flywheel is arranged on the dynamometer; the control system is used for controlling the dynamometer to operate, obtaining the measured loss torque and the corresponding rotating speed measured value, and correcting the measured loss torque.
Further, the dynamometer comprises a dynamometer main shaft, the tested power system comprises a tested power system output shaft, and the dynamometer main shaft is connected with the tested power system output shaft through a coupler.
Further, an inertia flywheel is arranged on the main shaft of the dynamometer.
Further, the control system comprises a main control computer and a controller which are connected, and the controller is connected with the dynamometer.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a method for improving the test working condition control precision and the torque measurement precision of a power system, which comprises the following steps:
(1) the method comprises a point-by-point correction method and a formula correction method, and is reasonable and effective. During a power system test, torque measurement correction is carried out through a point-by-point correction method or a formula method, the influence of loss torque caused by inertia and friction loss of a rotating part of the dynamometer is eliminated, and the torque measurement precision is improved.
(2) By adopting the method, the control precision of the test working condition of the power system can be improved at lower cost, and the torque measurement precision of the power system can be improved.
(3) After the method is used for correcting the measured torque, the influence of the inertia of other rotating parts except the rotating part of the output shaft of the engine and the friction resistance of the system on the measurement can be effectively eliminated, and the test precision can be effectively improved. On the other hand, although the lower the rotational inertia of the motor rotor and the output shaft (or the output shaft of the eddy current dynamometer) are, the smaller the influence on torque measurement is, the higher the measurement accuracy is, the smaller the stabilizing effect on the output shaft of the measured power unit in the measurement process is, the weaker the working condition control capability of the measured power unit is, that is, the poorer the working condition accuracy control capability is, in order to improve the working condition control accuracy of the measured power unit, the inertia of the rotating system needs to be increased, but the increase of the inertia can cause the increase of the measurement deviation.
(4) When the rotating speed is 100-1900 r/min, the improvement range of the measurement precision of correction by applying the least square method in the method can reach 86.47% -100.00%.
Furthermore, the invention increases the rotational inertia of the dynamometer rotating system and combines the torque correction method, so that the rotating system formed by the main shaft of the dynamometer and the output shaft of the power system can rotate more stably during the test of the power system, and the working condition control precision and the torque measurement precision can be effectively improved.
According to the invention, by arranging the inertia flywheel, when the torque fluctuation of a rotating system formed by the main shaft of the dynamometer and the output shaft of the power system is large during the test of the power system, the rotation of the power system at each rotating speed can be more stable by increasing the rotational inertia of the rotating system of the dynamometer, and after the inertia of the system is increased, the loss torque can be correspondingly increased, so that the torque measurement precision can be effectively improved. The device has low cost, is convenient to popularize and use, and can improve the control precision of the test working condition of the power system and the torque measurement precision.
Drawings
FIG. 1 is a schematic diagram of the present invention for increasing the moment of inertia measurement.
FIG. 2 is a schematic diagram of measuring torque without increasing inertia according to the present invention.
FIG. 3 is a comparison of experimental data corrected using the least squares method of the present invention.
Wherein: 1-a main control computer; 2-a controller; 3-a dynamometer; 4-a dynamometer spindle; 5-an inertial flywheel; 6-output shaft of power system to be tested; 7-the power system to be tested.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
The system shown in fig. 1 or fig. 2 comprises a main control computer 1 and a controller 2 which are connected, wherein the controller 2 is connected with a dynamometer 3, a dynamometer spindle 4 of the dynamometer 3 is connected with a tested power system output shaft 6, and the tested power system output shaft 6 is arranged on a tested power system 7. An inertia flywheel 5 can be additionally arranged on the main shaft 4 of the dynamometer.
If using fvrTo indicate the magnitude of the rotating system fluctuation, fvrThe smaller the fluctuation, and the fluctuation variation coefficient fvrThe relational expression with the torque Me of the measured object, the rotating speed n and the rotating inertia I of the rotating system can be expressed as follows:
Figure BDA0002151622020000051
wherein k is a stability coefficient of the test system (related to the system installation and the structure of the measured object, and the coefficient is determined after the system installation and the measured object are determined), and the larger the moment of inertia is, the larger the fluctuation change coefficient f isvrThe smaller the measurement, the smoother the measurement.
An inertia flywheel is arranged in a rotating shaft system consisting of the main shaft of the dynamometer and the power unit to be measured. The unstable condition of the working condition can be judged by using the deviation of the actually measured torque value in a certain measuring time and the average torque value in the time, and the unstable condition of the working condition can also be judged by using the fluctuation rate of the actually measured torque in the certain measuring time relative to the average torque, and the deviation is determined according to the specific test target requirement. If soMe-miRepresenting a series of torque values actually measured in a certain measuring time at a certain rotating speed, wherein N is the number of times of torque measured in a certain measuring time, and M is usede-aRepresenting the average value of the torque at a certain rotational speed over a certain measurement time, in Me-vIndicating the amount of torque change corresponding to a certain rotational speed point to
Figure BDA0002151622020000061
Torque ripple ratio, then:
Figure BDA0002151622020000062
Figure BDA0002151622020000063
Figure BDA0002151622020000064
if with Me-a-lOr
Figure BDA0002151622020000065
Representing the maximum torque deviation value or maximum torque fluctuation rate allowed by the test, for example 5%, when the relevant dynamometer is manufactured or before the test, the inertia in the rotation system of the main shaft of the dynamometer is increased by taking the above conditions as the basis, and the state of the device or the test state is determined by combining the torque correction method involved in the patent.
A method for improving the control precision and the torque measurement precision of the test working condition of a power system comprises the following steps:
step one, a measured power system 7 is not connected with a dynamometer 3, a main control computer 1 controls the dynamometer 3 to operate through a controller 2, a main shaft 4 of the dynamometer and an added flywheel 5 (if any) operate at a given rotating speed, when the rotating speed is stable, a loss torque Me _ l and a rotating speed n are measured through a torque sensor and a rotating speed sensor, and when the measurement of one rotating speed point is finished, the next point of the rotating speed measurement is adjusted to an expected rotating speed point; the torque sensor includes but is not limited to a load cell or an inductive torque sensor, and the like, and the revolution speed sensor includes but is not limited to a magnetoelectric revolution speed sensor or a Hall revolution speed sensor, and the like;
step two, the measured loss torque value and the corresponding measured speed value of each rotating speed point are stored in a main control computer of the dynamometer,
and step three, when the dynamometer runs, the main control computer can sample one of the two methods to correct the actually measured torque, so that the torque measurement precision is improved.
The first method, point-by-point correction, is to add the absolute value of the correction torque obtained in step 101 for each rotation speed point to the torque measured at each rotation speed point to obtain the final measured value of the output torque when the dynamometer is running.
The point-by-point correction method comprises the following steps: firstly, measuring the loss torque of the system at each rotating speed point. During measurement, a measured power system 7 is not connected with a dynamometer 3, a main control computer 1 controls the dynamometer 3 to operate through a controller 2, a main shaft 4 of the dynamometer and an added inertia flywheel 5 (if the inertia flywheel is added) operate at a given rotating speed, when the rotating speed is stable, loss torque Me _ l and the rotating speed n are measured, and after the measurement of one rotating speed point is finished, the next rotating speed point is adjusted until an expected rotating speed point; and step two, storing the measured loss torque value of each rotating speed point and the corresponding rotating speed measured value n into a dynamometer main control computer, wherein the loss torque is the correction torque Me _ c, namely Me _ c is Me _ l, and step three, when the dynamometer runs, adding the rotating speed point correction torque absolute value to each rotating speed point torque measured value by the main control computer to be used as the final output torque. When the output torque of the power system is measured, a main shaft 4 of the dynamometer, an added inertia flywheel 5 (if any) and an output shaft 6 of the power system are connected into the same rotating system through a coupler, a dynamometer main control computer 1 controls the dynamometer 3 through a controller 2, the power system is enabled to operate at a given rotating speed, and the measured torque Me _ m is added with a correction torque Me _ c to serve as a final output torque Me, namely Me is Me _ m + Me _ c.
And a second method, namely a formula correction method, wherein a fitting method (including but not limited to a least square method, a linear regression method, a logarithm method, a polynomial method, a power method, an exponential method, a moving average method and the like) is adopted for determining a correction formula Me _ c ═ f (Me _ l, n) (Me _ c in the formula is correction torque, Me _ l is actually measured loss torque at each rotating speed, and n is rotating speed of the dynamometer) for the loss torque and the corresponding rotating speed measured value obtained in the first step, and when the dynamometer operates, the rotation speed point correction torque value is added to each rotating speed point torque measured value to be used as a finally measured output torque value.
The formula correction method comprises the following steps: firstly, measuring the loss torque of the system at each rotating speed point, wherein the measuring method is the same as the previous method; secondly, for the measured loss torque Me _ l and the rotating speed n, the system determines a correction formula Me _ c ═ f (Me _ l, n) by using a fitting method (including but not limited to a least square method, a linear regression method, a logarithm method, a polynomial method, a power method, an exponential method, a moving average method and the like) (wherein Me _ c is the correction torque, Me _ l is the actually measured loss torque at each rotating speed, and n is the rotating speed of the dynamometer), and thirdly, when the dynamometer operates, the main control computer adds the calculated torque correction value of each rotating speed point to the torque measurement value of each rotating speed point to serve as the final output torque.
Step four, when the power system is measured, if the power system is tested, when the torque fluctuation of a rotating system formed by the main shaft 4 of the dynamometer and the output shaft 6 of the power system is large, the working condition control precision is poor, the system inertia can be increased in a mode of increasing the rotational inertia of the rotating system of the dynamometer, for example, but not limited to, the mode of increasing the inertia flywheel 5 in the rotating system of the dynamometer, so that the rotating of the power system is more stable at each rotating speed, the working condition control precision is improved, and the first method or the second method in the third step is adopted to correct the two torques and then the corrected torques are used as the final measured torque.
The method for improving the working condition control precision and the torque measurement precision in the method comprises the following steps: the method comprises the first step of increasing the rotational inertia of a dynamometer rotating system, increasing the system inertia by adding an inertia flywheel 5 in the dynamometer rotating system, and the second step of correcting the measured torque by combining a correction method.
TABLE 1 comparison of test data corrected using the least squares method of the invention
Figure BDA0002151622020000081
Figure BDA0002151622020000091
As can be seen from the above table 1 and fig. 3, when the rotating speed is 100-1900 r/min, the improvement range of the measurement precision corrected by the least square method in the method can reach 86.47% -100.00%.
In table 1 above are the results of the tests performed with the addition of an inertial flywheel; when the measuring system is unstable, the inertia flywheel is added, so that the rotational inertia of the system can be effectively increased, and the measuring precision can be more effectively improved by combining a torque correction method.
The method is reasonable and effective, when a power system is tested, torque measurement correction is carried out through a point-by-point correction method or a formula method, the influence of loss torque caused by inertia and friction loss of a rotating part of the dynamometer is eliminated, the torque measurement precision is improved, and by increasing the rotational inertia of the dynamometer rotating system and combining the torque correction method, the rotating system formed by a main shaft of the dynamometer and an output shaft of the power system is enabled to rotate more stably when the power system is tested, the working condition control precision and the torque measurement precision can be effectively improved, the cost is low, and the method is convenient to popularize and use.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (6)

1. A method for measuring torque of a power system is characterized by comprising the following steps: the method comprises the following steps:
step one, controlling a dynamometer (3) to operate until the rotating speed is stable, and measuring a plurality of groups of loss torques Me _ l and corresponding rotating speeds n;
in the first step, when a rotating shaft system consisting of the dynamometer (3) and the tested power system (7) runs unstably, the rotational inertia is increased; judging whether the operation of the rotating shaft system is stable or not according to the deviation between the actually measured torque value in the T measuring time and the average torque value in the measuring time; the conditions for judging whether the rotating shaft system operates stably are as follows: with Me-miRepresenting a series of torque values measured in T measuring time at a certain rotating speed, N is the number of times of torque measured in T measuring time, and M is usede-aRepresenting the average value of the torque at a certain speed over time T measured in Me-vIndicating the amount of torque change corresponding to a certain rotational speed point to
Figure FDA0002647322010000011
Representing the torque ripple rate, then:
Figure FDA0002647322010000012
Figure FDA0002647322010000013
Figure FDA0002647322010000014
with Me-a-lAnd
Figure FDA0002647322010000015
respectively representing the maximum torque deviation value and the maximum torque fluctuation rate allowed by the test at Me-a≤Me-a-lOr
Figure FDA0002647322010000016
Judging that the rotating shaft system runs stably, otherwise, judging that the rotating shaft system runs unstably;
step two, processing the loss torque Me _ l and the corresponding rotating speed n by adopting a point-by-point correction method or a formula correction method to obtain a correction torque Me _ c;
the point-by-point correction method is characterized in that a measured loss torque value and a corresponding measured rotation speed value n of each measured rotation speed point are stored in a dynamometer main control computer, and the loss torque is correction torque Me _ c, namely Me _ c is Me _ l;
determining a correction formula Me _ c ═ f (Me _ l, n) by a fitting method according to the loss torque and the corresponding rotating speed measured value obtained in the step one (wherein Me _ c is the correction torque, Me _ l is the loss torque at each rotating speed, and n is the rotating speed of the dynamometer);
and step three, controlling the dynamometer (3) to drive the tested power system (7) to operate, measuring the actually-measured torque Me _ m, and obtaining the output torque Me according to the corrected torque Me _ c and the actually-measured torque Me _ m.
2. The powertrain system torque measurement method of claim 1, wherein: the correction formula is obtained by a least square method, a linear regression method, a logarithm method, a polynomial method, a power method, an exponential method or a moving average method.
3. A powertrain system torque measuring device for use in the powertrain system torque measuring method of claim 1, characterized by: the device comprises a dynamometer (3), a control system and a tested power system (7), wherein the dynamometer (3) can be connected with the tested power system (7), and an inertia flywheel (5) is arranged on the dynamometer (3); the control system is used for controlling the dynamometer (3) to operate, obtaining the loss torque and the corresponding rotating speed measured value and correcting the loss torque.
4. A powertrain torque measuring device as recited in claim 3 wherein: the dynamometer (3) comprises a dynamometer main shaft (4), the tested power system (7) comprises a tested power system output shaft (6), and the dynamometer main shaft (4) is connected with the tested power system output shaft (6) through a coupler.
5. The powertrain system torque measuring device of claim 4, wherein: an inertia flywheel (5) is arranged on the main shaft (4) of the dynamometer.
6. A powertrain torque measuring device as recited in claim 3 wherein: the control system comprises a main control computer (1) and a controller (2) which are connected, and the controller (2) is connected with a dynamometer (3).
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