JP2736634B2 - Chassis dynamometer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a chassis dynamometer device capable of simulating a state where a vehicle such as an automobile is traveling on an actual road.

[Conventional technology]

In a conventional chassis dynamometer device, as shown in FIG. 4, a rotating roller on which a tire of a test vehicle is mounted is mounted.
A basic flywheel 43 is provided on a shaft 42 of 41, and a plurality of flywheels 44 having different amounts of inertia are clutched.
Mechanically connected to the shaft 42 via 45, the clutch
By connecting / disconnecting each flywheel 44 to / from the shaft 42 by turning on / off 45, an amount of inertia corresponding to the amount of inertia of the test vehicle is generated.

[Problems to be solved by the invention]

However, in the above-mentioned conventional chassis dynamometer device, it is necessary to provide a clutch mechanism such as a plurality of clutches 45, and the structure becomes complicated,
The size is inevitable and the price rises accordingly. Further, the inertia force generated by the on / off operation of the clutch 45 changes not only continuously but stepwise only by the amount of inertia of the lightest flywheel, and furthermore, since this step cannot be reduced, continuous It was not possible to obtain an arbitrary amount of inertia.

The present invention has been made in consideration of the above-described matters, and has as its object the purpose of continuously changing the amount of inertia and obtaining a small-sized and low-priced device capable of obtaining an arbitrary amount of inertia. An object of the present invention is to provide a chassis dynamometer device.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a basic flywheel and an eddy current absorbing plate that absorbs power by eddy current generated when a field current flows are integrally formed, and these are integrated. In order to generate an amount of inertia according to the amount of inertia of the test vehicle, it is connected to a shaft of a rotating roller on which a tire of the test vehicle is mounted, and a torque sensor and a speed sensor are provided on this shaft. Calculate a target torque from the acceleration of the rotating roller obtained from the output,
A function generator for calculating the field current so that the measured torque obtained from the torque sensor becomes the target torque; and a current control device for outputting the output of the function generator as a current. The eddy current absorption plate is configured to supplement the torque of the minute.

[Action]

In the above means, the amount of inertia of an arbitrary magnitude can be continuously changed by making the proportionality constant variable. And the amount of inertia by the flywheel can be made as small as possible, and since a small flywheel can be used, the whole apparatus can be downsized,
Further, since a clutch mechanism and the like are not required, the cost is reduced.

In addition, since the basic flywheel and the eddy current absorption disk are integrally formed, the configuration of the apparatus can be made more compact.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a configuration of a chassis dynamometer apparatus according to the present invention. In this figure, reference numeral 1 denotes a rotating roller on which a driving wheel (not shown) of a test vehicle (not shown) is mounted, and a shaft thereof. 2 has a basic flywheel 3 and a field current i _F
And an eddy current absorbing plate 4 that absorbs power by eddy currents generated by flowing air, and mounts the tires of the test vehicle in order to generate an inertia amount corresponding to the inertia amount of the test vehicle. Connected to the shaft 2 of the rotating roller 1. Further, a torque sensor 5 and a speed sensor 6 are provided on the shaft 2.

Although not shown in detail, the eddy current absorption disk 4 is a rotor made of an iron disk fixed to the shaft 2 and a field coil disposed on the surface of the rotor with a predetermined gap therebetween. When a current i _F is supplied to the field coil, an eddy current is generated in the rotor, and thereby a torque is generated by the magnetic field in the rotor and the magnetic field of the field. FIG. 2 shows absorption characteristics when the field current i _F is used as a parameter. In this figure, V is the number of rotations of the rotary roller 1, T is the torque, and the output of the torque sensor 5 (=
T _e ) and i _{F0 to} i _F2 indicate field currents, respectively.

Reference numeral 7 denotes a current control device for controlling the field current of the eddy current absorption disk 4, and reference numeral 8 denotes a control device such as a function generator, which has an acceleration determination function and a target setting function. A control signal to the current control device 7 is output based on various inputs such as the output T of the motor 5, the output V of the speed sensor 6, the weight (inertial force) of the test vehicle, and the amount of inertia of the flywheel 3. .

And Thus, in the chassis dynamometer apparatus, as a method for obtaining the target torque T ₁ and target field current i _F,
There are a normal control method performed based on the actual acceleration of the rotating roller 1 and a simple control method performed based on the target acceleration of the rotating roller 1. Therefore, these will be briefly described.

First, the weight of the test vehicle is I _SET , the total inertia of the rotating roller 1, the flywheel 3 and the eddy current absorber 4 is I _BASE ,
The actual speed of the rotating roller 1 (V _R = V), the absorption torque by eddy current absorbed Release 4 T _e, a proportional constant K _p, when the K _i, in the normal control method, It is expressed as Here, I _SET -I _BASE (= D) is a constant.

As understood from these equations, in the ordinary control method, the target torque T ₁ is the actual acceleration of the rotating roller 1.
It is controlled to be proportional to dV _R / dt. The target field current I _F is called PI control.

Next, in the simple control method, the target torque T ₁ is Then, the target field current i _F is expressed as follows.

When dV _R /dt>0.2 (m / S ² ), that is, during acceleration, i _F = F (I _SET −I _BASE , V _R ) dV _R /dt≦0.2 (m / S ² ) That is, shifting, constant speed,
When deceleration is the i _F = 0 above, dV _MODE / dt is the rotation roller 1 target acceleration, 0.79 (m / S ²⁾ is the acceleration at 10 mode.

FIG. 3 shows the F (I _SET -I _BASE , V _R ) characteristic.

Above in the simple control method, the target torque T ₁ is controlled to be proportional to the target acceleration dV _MODE / dt of the rotating roller 1. Further, the target field current i _F is set according to the magnitude of the actual acceleration dV _R / dt of the rotating roller 1.

〔The invention's effect〕

The present invention is configured as described above. An arbitrary amount of inertia can be obtained by changing the acceleration of the rotating roller, which is a proportional constant, and the magnitude of the amount of inertia can be continuously switched. The basic flywheel may be considerably smaller than that of a conventional chassis dynamometer device of this type, so that the entire device can be made compact and inexpensive. In addition, since the basic flywheel and the eddy current absorbing disk are integrally formed, the configuration of the device becomes more compact.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a block diagram showing a configuration of a chassis dynamometer device according to the present invention, and FIG. 2 shows an absorption characteristic of an eddy current absorption disk. Figure,
FIG. 3 is a diagram showing F (I _SET -I _BASE , V _R ) characteristics. FIG. 4 shows a conventional example. 1 ... Rotating roller, 2 ... Rotating roller shaft, 3 ... Basic flywheel, 4 ... Eddy current absorption plate, 5 ...
Torque sensor 6, speed sensor 7, current controller 8, function generator V, output of speed sensor, T
… Measured torque, i _F , i _{F0 to} i _F2 …… Field current.

Continuation of front page (72) Inventor Tokihiro Tsukamoto 2 Higashi-cho, Kichijoin-miya, Minami-ku, Kyoto, Kyoto Inside (72) Inventor Shigeo Nakamura 2nd Higashi-cho, Kichijoin-miya, Minami-ku, Kyoto, Kyoto Stock (56) References JP-A-52-5101 (JP, A) JP-A-52-43201 (JP, A) JP-A-62-267640 (JP, A) Jpn. , U) Japanese Patent Publication No. 40-28508 (JP, B1) Japanese Patent Publication No. 44-8639 (JP, B1)

Claims (1)

(57) [Claims] An integrated eddy current absorbing plate for absorbing power by an eddy current generated when a field current flows is formed integrally with a basic flywheel, and these are adapted to the inertia of a test vehicle. It is connected to the axis of a rotating roller on which the tire of the test vehicle is mounted to generate an amount of inertia, and a torque sensor and a speed sensor are provided on this axis, and further, the rotation roller is obtained from the output of the speed sensor. A function generator that calculates a target torque from acceleration and calculates a field current so that an actually measured torque obtained from the torque sensor becomes the target torque, and a current control device that outputs the output of the function generator as a current. A chassis dynamometer device wherein the torque that is not enough by the flywheel is supplemented by the eddy current absorption disk.