JPS59120933A - Torque control testing device - Google Patents

Abstract

PURPOSE:To obtain a high-precision torque control testing device with a simplified operation, by providing a flywheel device and a rotating speed detector, which are equipped on the same shaft on one side of a sample body, and a driving circuit to which outputs of the rotating speed detector and an acceleration/ deceleration setter are inputted and which drives a motor. CONSTITUTION:An input shaft of a sample body of a transmission or transmission accelerator of a car is provided with a flywheel device 12 coaxially through a rotating speed detector 7' instead of a conventional motor part, and a motor 3', which drives the sample body 1, similar to a conventional motor is provided coaxially on the output shaft. The output of a rotating speed setter 5' which sets the rotating speed of the input shaft of the sample body 1 is inputted to an acceleration/deceleration setter 6', which sets a certain acceleration/deceleration, through a contact (a) of a switch 13 having contacts (a) and (b). The output of the rotating speed detector 7' and the output of the acceleration/deceleration setter 6' which is provided instead of a conventional part of current setter and changeover switch are inputted to a driving circuit 14 which drives the motor 3'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque control testing device that applies a constant torque to an automobile transmission or transaxle to test for noise, gear dropout, etc. of a specimen. As a control testing device, the one shown in FIG. 1 is well known.

FIG. 1 is a block diagram showing the main structure of a conventional torque control testing device.

In Fig. 1, an electric motor 2 is coaxially connected to the input shaft of a specimen 1, which is a transmission or transaxle of an automobile, and an electric motor 3 as a load absorber is connected coaxially to the output shaft. These control systems are constructed as follows.That is, the speed control device 4 inputs the output of the speed signal voltage set in the rotation speed setting device 5, and outputs the acceleration/deceleration setting device 6. Therefore, the output as a speed command The voltage is compared with the output voltage as a negative feedback signal of the rotational speed detector 7 provided coaxially with the input shaft of the specimen 1, and the rotation speed of the motor 2, that is, the rotational speed of the input shaft of the specimen 1 is determined as the rotational speed. The setting device 5I controls the current to be constant at a predetermined value set by the setting device 5I.The current control device 8 also detects the current of the motor 3, which is arranged as a DC sleeper, using a current detector 9, and controls the current. a voltage signal proportional to
By comparing the voltage signal of the constant current command value sent from the changeover switch 10, the torque of the output shaft of the specimen 1 is controlled to be a constant torque proportional to the constant current command value.

Here, the changeover switch 10 is used to generate a signal in response to changing the gear ratio of the specimen L, and several types of ILI are used so that the torque of the input shaft is always maintained at a constant value. Current setting device 11 with current setting
This is used to switch the current signal output from the

Thus, such a torque control test device controls the speed of the electric motor 2 of the input shaft of the specimen L, and by keeping the current of the electric motor 3, which is used as a load absorber of the output shaft, constant, the torque applied to the specimen L is controlled. A structure is adopted in which the test specimen 1 is tested by controlling the applied torque.

However, this type of motor has electric motors 2 and 3 and a speed control device 4 as its control device. It is necessary to include a current control device 11i8 or the like.

In addition, in order to control the output shaft torque of the specimen l to a constant value,
It is necessary to change the value of this current according to the gear ratio I of the specimen 1 using a changeover switch 10.

This has the disadvantage that the operation is complicated and the accuracy of torque control is also low.

It is an object of the present invention to eliminate the above-mentioned drawbacks and to provide a torque control testing device with simplified operation and high accuracy. Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 2 is a block diagram showing the main structure of an embodiment of the present invention. That is, a flywheel device 12 replacing a conventional electric motor section is provided coaxially with the input shaft of a specimen 1 of a transmission or transaxle of an automobile via a rotational speed detector 7'. Also,
An electric motor 3' similar to a conventional motor for operating the specimen 1 is provided coaxially with the output shaft of the specimen 1. Furthermore, a rotation speed setting device 5 for setting the rotation speed of the input shaft of the specimen l.
' is provided, and the output of this rotational speed setting device 5' is connected to a contact a.
, b is inputted to an acceleration/deceleration setting device 6' which sets a constant acceleration/deceleration through a contact a of a switch 13 having terminals 13, 13, and 13. Furthermore, the drive circuit 14, which is arranged as the only motor drive and drives the motor 3', includes a rotational speed detector 7'.
and an acceleration/deceleration setting device 6' in place of the current setting device and changeover switch portion of the conventional example, and this output is inputted respectively. In this way, the input shaft of the specimen 1 is equipped with the rotational speed detector 7' and the flywheel device 12, and the output shaft is equipped with the electric motor 3'. In addition, the output shaft may be provided with a rotational speed detector 7' and a flywheel device 12, and an output shaft feedback system may be used instead of the input shaft feedback system.

Next, the operation of the configuration shown in FIG. 2 will be explained with reference to FIG. 3. Here, Fig. 3 shows the characteristics of the specimen shown in Fig. 2, and (a) shows the input shaft rotational speed (rpm).
(b) shows the relationship between input shaft torque (cR) and time (SeC).

That is, in FIGS. 2 and 3, the acceleration/deceleration setting device 6
When the switch 13, which provides the acceleration/deceleration setting signal to 6'. Then, the output of the acceleration/deceleration setting device 6' is used as a speed command, and the output of the rotation speed detector 7' is used as a negative feedback signal, and each drive circuit 14
is input. The drive circuit 14 also adjusts the current of the motor 3' and controls the flywheel device 12.
The acceleration and deceleration of the motor can be controlled to a constant value.

Here, the control torque obtained by controlling the current of the electric motor 3', that is, the input shaft torque T, is as follows (11
As shown in Eq.

T = I・dω/di (Kg・m) −fl
) Here, ■ is a previously known amount of inertia of the flywheel device 12, ω is the rotational speed of the output shaft, and t is time.

As shown in equation (1), the input shaft torque T is a value proportional to the amount of change over time (dω/dt) in the rotational speed of the electric motor 3', that is, the rotational speed ω of the output shaft of the specimen 1. It has become. Therefore, as shown in the characteristic shown in FIG.
increase to. At this time, the flywheel device 1
2, a constant amount of torque is applied to the input shaft until time t1, and suitable torque characteristics can be obtained. next,
When the input shaft rotational speed reaches the rotational speed set by the rotational speed setting device 5', the rotational speed detector 7 outputs an output signal, tts.
s xiv From 1°, the input shaft rotational speed becomes constant, and no torque is applied to the input shaft, resulting in a zero state.

In addition, when it is desired to apply a negative torque, in order to decelerate the input shaft of the specimen l that was rotating constantly, the contact of the switch 13 is switched from contact a to contact bl at time t2, and the acceleration/deceleration is set. Due to the constant deceleration characteristic of the device 6', a constant amount of negative torque is applied to the input shaft. and,
When the rotation of the input shaft stops at time ts, no negative torque is applied to the input shaft and it becomes zero.

In this way, depending on the characteristics of the acceleration/deceleration setting device 6' that sets the acceleration and deceleration to predetermined values, the time 0 to t1
And between 12 and 13, torque control is performed to test the noise of the specimen, gear slippage, etc.

Here, in order to obtain highly accurate torque control for the input shaft torque T, consideration is given to reducing the mechanical loss and windage loss of the flywheel device 12. Further, even when the gear ratio of the specimen I is changed, the torque is automatically controlled and a predetermined torque can be obtained without changing the loop transfer characteristics of the control system.

Since this can be easily understood from the torque control characteristics shown in FIGS. 2 and 3, the explanation is omitted.

As explained above, according to the present invention, only one set of the electric motor and its control device is required, and even if the gear ratio of the test object is changed, the round transfer characteristic of the control system is not changed and the torque is automatically controlled. and a predetermined torque is obtained. Therefore, the present invention can provide an exceptional device that simplifies complicated operations and can obtain stable and highly accurate torque.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main part configuration of a conventional torque control test device, FIG. 2 is a block diagram showing the main part structure of an embodiment of the present invention, and FIG. 3 is an explanation of FIG. 2. (al is input shaft rotation speed (rpm) and time (SeC)
b) is a characteristic diagram of the specimen section showing the relationship between input shaft torque (Im) and time (SeC). l...Specimen, 3, 3'...Motivation, 5,
5'・Rotation speed setting device, 6.6′・・Acceleration/deceleration setting device, 7・7′・・Rotation speed detector, 12・
...Flywheel device (device, 14...drive circuit. Patent applicant Toyo Denki Manufacturing Co., Ltd. Representative Atsushi Doi, 11) ノ Figure 2/? Procedural amendment (voluntary) February 3, 1980 Commissioner of the Japan Patent Office 1, Indication of the case 1982 Patent Application No. 227459 4 Name of the invention Torque control testing device 3, person making the amendment Relationship to the case Patent application Postal code 104 2-7-2 Yaesu, Chuo-ku, Tokyo ``without any change in the open-loop transfer characteristic'' is corrected to ``because the drive circuit 141 automatically controls the amount of change in the rotational speed of the input shaft of the specimen L over time to be constant''. (3) On page 8, lines 13 to 14, "the control system's open-loop transfer characteristics remain unchanged" is replaced by "the amount of temporal change in the rotational speed of the input shaft of the specimen l by the drive circuit 14." It is automatically controlled so that it remains constant.

Claims (1)

[Claims] Testing the torque control of the transmission or transaxle of the 11th float (herein, a flywheel device and a rotation speed detector each coaxially provided on one side of the test piece, and a coaxial Above is a B motive for operating this specimen, a rotational speed setting device for the specimen, an acceleration/deceleration setting device for setting a constant acceleration/deceleration of the output of this rotational speed setting device, and an output of the rotational speed detector. A torque control test device comprising a drive circuit that inputs the outputs of acceleration/deceleration setting devices and drives the electric motor.