JP7257940B2 - Control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device in a bench test system for testing a test piece by driving a test piece with a motor simulating an engine.

Conventionally, in a bench test system that tests a driveline (drivetrain) such as a transmission that transmits the energy generated by an automobile engine to the drive wheels, the input of the driveline (hereinafter referred to as "specimen") An engine drive system was used in which an engine was connected to the shaft to apply drive torque, and a motor was connected to the output shaft to apply load torque. However, the engine drive method requires a lot of incidental equipment and is laborious, so nowadays, a motor drive method is used in which a motor is used instead of the engine to apply drive torque to the input shaft of the test piece.

When evaluating the performance of a specimen, it is necessary to simulate the behavior of the engine. The engine behavior (rotational speed and torque) undergoes periodic fluctuations (sinusoidal pulsations) in accordance with the engine rotational speed and the number of cylinders. Therefore, in Patent Document 1, a sine wave excitation command for periodically varying the rotation speed of the motor is added to a motor rotation speed command, and the sum of the rotation speed command and the sine wave excitation command and the motor actual A technique for controlling (vibration torque control) so as to eliminate the deviation from the rotational speed is described.

JP 2013-257234 A

In the test in the bench test system, the output torque of the motor simulating the engine must satisfy predetermined conditions (for example, follow the specified required torque, do not exceed the rated torque of the motor, etc.). In vibration excitation torque control described in Patent Literature 1, there are cases where the predetermined conditions described above are not satisfied. In such a case, the user performing the test has to manually adjust the output torque of the motor so that the output torque of the motor satisfies a predetermined condition, which is time-consuming.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of the above-described problems, is to provide a control device that can more easily adjust the output torque of a motor in a motor-driven bench test system.

In order to solve the above problems, a control device according to the present invention is a control device for the motor in a bench test system for testing the test piece by driving the test piece with a motor simulating an engine, an excitation torque command generator that generates an excitation torque command that indicates the output torque of the motor including a pulsation component based on the number of engine cylinders, the number of revolutions of the motor, and a predetermined inertia value; and the number of revolutions of the engine. Using the correspondence relationship between the engine speed and the amplitude value of the output torque of the engine including the pulsation component, which is obtained from rotation pulsation data indicating the temporal fluctuation of the rotation speed of the motor An excitation torque estimator for estimating an excitation torque that is the output torque of the motor, an excitation torque estimated by the excitation torque estimator, and the required torque required for the motor in the test are compared. A first comparator and a corrector for correcting the vibration torque command generated by the vibration torque command generator based on the comparison result of the first comparator.

Further, in the control device according to the present invention, a second comparator for comparing the excitation torque estimated by the excitation torque estimator and the rated torque of the motor, and a comparison result of the second comparator. and a limiter for limiting the vibration excitation torque command after correction by the corrector based on the above.

Further, in order to solve the above problems, a control device according to the present invention is a control device for the motor in a bench test system for testing the test piece by driving the test piece with a motor simulating an engine. an excitation torque command generator for generating an excitation torque command that indicates the output torque of the motor including periodic fluctuations based on the number of cylinders of the engine, the number of rotations of the motor, and a predetermined inertia value; Using the correspondence relationship between the engine speed and the amplitude value of the output torque of the engine including the pulsation component, which is obtained from rotation pulsation data indicating fluctuations in the engine speed, a vibration torque estimator for estimating a vibration torque that is the output torque of the motor; a comparator for comparing the vibration torque estimated by the vibration torque estimator with the rated torque of the motor; a limiter that limits the vibration excitation torque command generated by the vibration excitation torque command generator based on the comparison result of the comparator.

According to the control device of the present invention, it is possible to more easily adjust the output torque of a motor in a motor-driven bench test system.

It is a figure which shows the structural example of the control apparatus which concerns on the 1st Embodiment of this invention. FIG. 4 is a diagram for explaining explosive fluctuations in engine output torque; It is a figure which shows the structural example of the control apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structural example of the control apparatus which concerns on the 3rd Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated, referring drawings.

(First embodiment)
FIG. 1 is a diagram showing a configuration example of a control device 10 according to the first embodiment of the present invention. A control device 10 according to the present embodiment controls a motor that drives an input shaft of a specimen in a motor-driven bench test system.

1 includes an excitation torque command generator 11, a differentiator 12, an engine torque converter 13, an excitation torque estimator 14, a comparator 15, a corrector 16, and an adder. 17.

The excitation torque command generator 11 generates a pulsation component simulating the behavior of the engine based on the number of cylinders of the engine simulated by the motor, the rotation speed of the motor corresponding to the rotation speed of the simulated engine, and a predetermined inertia value. generates a vibration excitation torque command that indicates the output torque of the motor including The excitation torque command is a command obtained by adding periodic torque fluctuations to a constant torque.

As shown in FIG. 1 , the excitation torque command generator 11 includes dividers 111 , 112 and 115 , a multiplier 113 , an adder 114 and a sine wave command generator 116 .

The divider 111 receives the number of engine cylinders. In general, during two revolutions of the engine, an explosive variation in the output torque corresponding to the number of engine cylinders, that is, a pulsation of the output torque occurs. Therefore, in a four-cylinder engine, four explosion fluctuations of the output torque occur during two revolutions of the engine. In addition, in a six-cylinder engine, the output torque explodes six times during two revolutions of the engine. A divider 111 divides the number of cylinders of the engine by 2 to obtain the number of pulsations of the output torque of the engine during one rotation of the engine. Divider 111 outputs the division value to multiplier 113 .

The divider 112 receives the motor rotation speed (revolutions per minute) corresponding to the simulated engine rotation speed. A divider 112 divides the number of revolutions of the motor by 60 to obtain the number of revolutions per second. Divider 112 outputs the division value to multiplier 113 .

The multiplier 113 multiplies the division value output from the divider 111 (the number of pulsations of the output torque per revolution of the engine) by the division value output from the divider 112 (the number of revolutions per second). do. The multiplier 113 outputs the multiplied value to the sine wave command generator 116 as the excitation frequency. The excitation frequency indicates the frequency of pulsation of the output torque of the engine.

The adder 114 receives the specimen inertia value and the apparatus inertia value as predetermined inertia values. The specimen inertia value is the inertia value of the specimen under test. The device inertia value is the test equipment inertia value. The adder 114 adds the input test piece inertia value and apparatus inertia value and outputs the added value to the divider 115 .

Divider 115 divides the added value output from adder 114 by a predetermined constant K (eg, 1.52). The divider 115 outputs the division value to the sine wave command generator 116 as an excitation amplitude value. The vibration amplitude value indicates the amplitude value of the output torque of the engine, and is a value obtained by adding the amplitude value of the pulsation component to a constant torque.

The sine wave command generator 116 generates a sine wave whose frequency is the excitation frequency output from the multiplier 113 and whose amplitude value is the excitation amplitude value output from the divider 115 . The sine wave command generator 116 outputs the generated sine wave to the adder 17 as an excitation torque command that indicates the output torque of the motor. The excitation torque command is a command that indicates the output torque of the motor that includes a pulsating component.

The differentiator 12 receives rotational pulsation data representing temporal variations in the number of revolutions of the engine simulated by the motor. The differentiator 12 differentiates the input rotational pulsation data, converts the rotational pulsation data into data representing temporal variations in the output torque of the engine, and outputs the data to the engine torque converter 13 . Rotational pulsation data is obtained by pre-measuring the engine speed simulated by the motor.

The engine torque converter 13 obtains the pulsation of the output torque for one revolution of the engine based on the data (see FIG. 2) output from the differentiator 12 and indicating the temporal variation of the output torque of the engine. From the pulsation of the output torque for one rotation of the engine, a correspondence relationship (map) between the engine speed and the amplitude value of the engine output torque including the pulsation component can be obtained.

The excitation torque estimator 14 receives the motor rotation speed corresponding to the simulated engine rotation speed. The excitation torque estimator 14 uses the correspondence relationship between the engine rotation speed and the amplitude value of the engine output torque including the pulsation component to obtain the motor output torque corresponding to the input motor rotation speed. Estimate a certain excitation torque. The excitation torque is a value obtained by adding the amplitude value of the pulsation component to a constant torque, and is an estimated value of the actual output torque of the motor. The excitation torque estimator 14 outputs the estimated excitation torque to the comparator 15 .

The comparator 15 compares the excitation torque output from the excitation torque estimator 14 with the required torque (torque that the motor should output) required for the motor in the test, and outputs the comparison result to the corrector 16. do.

The corrector 16 outputs a correction value according to the comparison result output from the comparator 15 to the adder 17 . The correction value output from the corrector 16 is added to the excitation torque command by the adder 17 . That is, the corrector 16 corrects the excitation torque command based on the comparison result of the comparator 15 . For example, when the vibration excitation torque is smaller than the required torque, the corrector 16 outputs a correction value for increasing the vibration excitation torque command to the adder 17 . Further, the corrector 16 outputs to the adder 17 a correction value for reducing the vibration excitation torque command, for example, when the vibration excitation torque is greater than the required torque.

In testing a specimen, for example, a condition may be set such that the output of an engine (motor) is increased or decreased at a certain number of revolutions. Such a condition may not be satisfied by an excitation torque command generated based on the number of engine cylinders, the number of engine revolutions, and a predetermined inertia value. In such a case, conventionally, the user performing the test had to manually adjust the output torque of the motor.

On the other hand, in the present embodiment, the actual output torque (excitation torque) of the motor estimated from the number of rotations of the motor is compared with the required torque, and the excitation torque command is corrected based on the comparison result. The output of the engine (motor) can be automatically adjusted according to the conditions set in the test. Therefore, in a motor-driven bench test system, the output torque of the motor can be adjusted more easily.

As described above, the control device 10 according to the present embodiment uses the correspondence between the engine speed and the amplitude value of the engine output torque including the pulsation component to obtain the output torque of the motor corresponding to the motor speed. An excitation torque estimator 14 that estimates a certain excitation torque, a comparator 15 that compares the estimated excitation torque and the required torque, and a corrector 16 that corrects the excitation torque command based on the comparison result. , provided.

Therefore, since the output torque of the motor can be automatically adjusted following the required torque, it is possible to more easily adjust the output torque of the motor in a motor-driven bench test system.

(Second embodiment)
FIG. 3 is a diagram showing a configuration example of the control device 20 according to the second embodiment of the present invention. In FIG. 3, the same components as in FIG. 1 are denoted by the same reference numerals, and descriptions thereof are omitted.

The control device 20 shown in FIG. 3 is different from the control device 10 shown in FIG. 1 in that the comparator 15, the corrector 16 and the adder 17 are replaced with a comparator 21, a limiter 22 and an adder 23, respectively. Points are different. That is, the control device 20 according to the present embodiment includes an excitation torque command generator 11, a differentiator 12, an engine torque converter 13, an excitation torque estimator 14, a comparator 21, and a limiter 22. , an adder 23 .

Comparator 21 compares the excitation torque estimated by excitation torque estimator 14 with the rated torque of a motor simulating an engine, and outputs the comparison result to limiter 22 .

The limiter 22 outputs a correction value for limiting the vibration torque command generated by the vibration torque command generator 11 to the adder 23 based on the comparison result of the comparator 21 . Specifically, the limiter 22 outputs a correction value for limiting the vibration torque command (reducing the vibration torque command) to the adder 23 when the vibration torque is greater than the rated torque. The correction value output from the limiter 22 is added to the excitation torque command by the adder 23 . That is, the limiter 22 limits the excitation torque command based on the comparison result of the comparator 21 .

As described above, the control device 20 according to the present embodiment includes the comparator 21 that compares the excitation torque estimated by the excitation torque estimator 14 and the rated torque of the motor, and based on the comparison result of the comparator 21, and a limiter 22 that limits the excitation torque command,

As a motor that simulates an engine, a motor using magnets is generally used. When such a motor outputs a torque exceeding the rated torque, a phenomenon called demagnetization occurs, in which the magnetic force of the magnets constituting the motor is reduced.

An excitation torque command generated based on the number of engine cylinders, engine speed, and a predetermined inertia value may instruct output of torque exceeding the rated torque of the motor. In such a case, conventionally, the user performing the test had to manually adjust the output torque of the motor so that the output torque of the motor did not exceed the rated torque.

On the other hand, in the present embodiment, the actual output torque (excitation torque) of the motor estimated from the number of revolutions of the motor is compared with the rated torque, and based on the comparison result, the excitation torque command is limited. The output torque of the engine (motor) can be automatically adjusted so that demagnetization does not occur. Therefore, in a motor-driven bench test system, the output torque of the motor can be adjusted more easily.

(Third embodiment)
FIG. 4 is a diagram showing a configuration example of the control device 30 according to the third embodiment of the present invention. In FIG. 4, the same components as in FIGS. 1 and 2 are denoted by the same reference numerals, and descriptions thereof are omitted.

The controller 30 shown in FIG. 4 differs from the controller 10 shown in FIG. 1 in that a comparator 21, a limiter 22 and an adder 31 are added. That is, the control device 30 according to the present embodiment includes an excitation torque command generator 11, a differentiator 12, an engine torque converter 13, an excitation torque estimator 14, a comparator 15, and a corrector 16. , an adder 17 , a comparator 21 , a limiter 22 and an adder 31 . Comparator 15 is an example of a first comparator. Comparator 21 is an example of a second comparator.

The operations of the comparator 21 and limiter 22 are the same as in the second embodiment. However, in the present embodiment, the limiter 22 outputs a correction value for limiting the excitation torque command to the adder 31 based on the comparison result of the comparator 21 .

The adder 31 adds the correction value output from the limiter 22 to the excitation torque command output from the adder 17 (the excitation torque command corrected by the corrector 16). Therefore, in this embodiment, the limiter 22 limits the excitation torque command after correction by the corrector 16 based on the comparison result of the comparator 21 .

Therefore, according to the control device 30 according to the present embodiment, the output torque of the motor can be automatically adjusted to follow the required torque, and the output torque of the engine (motor) can be adjusted so as not to cause demagnetization. can be adjusted automatically. Therefore, in a motor-driven bench test system, the output torque of the motor can be adjusted more easily.

Although the above embodiments have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of the invention. Therefore, this invention should not be construed as limited by the above-described embodiments, and various modifications and changes are possible without departing from the scope of the claims.

Reference Signs List 10, 20, 30 control device 11 excitation torque command generator 12 differentiator 13 engine torque converter 14 excitation torque estimator 15 comparator (first comparator)
16 corrector 17, 23, 31 adder 21 comparator (second comparator)
22 limiter 111, 112, 115 divider 113 multiplier 114 adder 116 sine wave command generator

Claims (3)

A control device for the motor in a bench test system for testing the test piece by driving the test piece with a motor simulating an engine,
an excitation torque command generator that generates an excitation torque command that indicates the output torque of the motor including a pulsation component, based on the number of cylinders of the engine, the number of rotations of the motor, and a predetermined inertia value;
Using the correspondence relationship between the engine speed and the amplitude value of the output torque of the engine including the pulsation component, which is obtained from the rotation pulsation data indicating the temporal fluctuation of the engine speed, an excitation torque estimator for estimating an excitation torque, which is the output torque of the motor according to the rotation speed;
a first comparator that compares the excitation torque estimated by the excitation torque estimator with the required torque required for the motor in the test;
and a corrector that corrects the excitation torque command generated by the excitation torque command generator based on the comparison result of the first comparator. The control device according to claim 1,
a second comparator for comparing the excitation torque estimated by the excitation torque estimator and the rated torque of the motor;
and a limiter that limits the excitation torque command corrected by the corrector based on the comparison result of the second comparator. A control device for the motor in a bench test system for testing the test piece by driving the test piece with a motor simulating an engine,
an excitation torque command generator that generates an excitation torque command that indicates the output torque of the motor including periodic fluctuations based on the number of cylinders of the engine, the number of rotations of the motor, and a predetermined inertia value;
Using the correspondence relationship between the engine speed and the amplitude value of the output torque of the engine including the pulsation component, which is obtained from the rotation pulsation data indicating the fluctuation of the engine speed, the rotation speed of the motor is calculated. an excitation torque estimator for estimating an excitation torque, which is the output torque of the motor according to the
a comparator that compares the excitation torque estimated by the excitation torque estimator with the rated torque of the motor;
and a limiter that limits the excitation torque command generated by the excitation torque command generator based on the comparison result of the comparator.

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