JPH04198835A - Four-wheel test bench apparatus - Google Patents

Abstract

PURPOSE:To execute the test corresponding to a road surface state of every kind by driving a tire rotating contact roller by a three-phase winding type induction electromotor and connecting a voltage regulator to the electromotor on the primary side thereof and connecting a variable resistor and the winding resistor of a permanent magnet iron core thereto on the secondary side thereof. CONSTITUTION:The test of the characteristics to different road surfaces is executed by adjusting the slide of the max. torque point by adjusting a variable resistor 8 on a secondary side. Further, the torque/slide characteristics of a three-phase winding type induction electromotor 6 can be made flat by a winding resistor 10 and are made similar to the coefficient of friction/slide characteristics at the time when a road surface is in an ice surface state to make it possible to execute a good test. Further, since the magnitude of the max. torque of the electromotor 6 can be adjusted by the voltage regulator provided on a primary side, a test can be executed corresponding to a road surface state of every kind by one electromotor 6 without using a slide element.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a four-wheel test bench device for simulating various road conditions for testing anti-lock brake systems, drive slip regulators, etc.

80 Summary of the Invention The present invention provides a four-wheel test bench device in which a roller that contacts a tire is driven by a three-phase wound induction motor, and a variable resistor and a permanent magnet are provided on the secondary side of the three-phase wound induction motor. Since the induction machine is constructed by connecting a wire-wound resistor with an iron core, this induction machine can be adjusted to correspond to various road surface conditions and tests can be carried out.

BACKGROUND OF THE INVENTION Conventional test bench apparatuses for simulating driving of a vehicle include the one shown in FIG. 4 as an example. This connects the collar 3 to the motor 1 via the sliding element 2. Then, a test is performed by transferring a vehicle tire 4 onto this roller 3.

Additionally, in general, the characteristics of the slip versus friction coefficient between the road and the tires 4 change as shown in the characteristic diagram in FIG. 5 under various road surface conditions such as dry asphalt, wet asphalt, or water surface. do.

Therefore, in the conventional test bench apparatus illustrated in FIG. 4, when the motor 1 is driven and the roller 3 is rotated via the sliding element 2, the slip-to-friction coefficient of the road condition to be simulated is calculated in the sliding element 2. The rotational driving force was adjusted accordingly, and the roller 3 was rotated to test the anti-lock brake system, drive slip adjuster, etc.

That is, the sliding element 2 may be a tuned friction coupling, a fluid coupling, an electromagnetic coupling, or the like. Moreover, a necessary condition for the sliding element 2 is that the relationship between torque and sliding is the same as the relationship between the tire 4 and the friction corresponding to the road surface condition. This is because when the tire is slipping due to applying the brakes, the tire 4 wears out due to the transmitted wheel force, but in order to prevent this wear, the tire 4 and the roller 3 are The tires 4 and rollers 3 are brought into contact so as to transmit force without slipping, and the slipping between the tires 4 and the rollers 3 is absorbed by the sliding elements 2, so that wear of the tires 4 is minimized.

In contrast, recently, motors and sliding elements have been integrated,
By reducing the number of components and reducing energy consumption, space can be saved and costs can be reduced. A four-wheel test bench device as shown in FIG. 6 has been proposed. In this system, a three-phase squirrel cage conductive motor 5 rotates a roller 3, and a tire 4 is transferred onto the roller 3. To test an anti-lock braking system using this device, simulate braking by replacing the slip vs. friction coefficient characteristics of the road and tires 4 shown in Figure 5 with the slip vs. torque characteristics of the electric motor. . Furthermore, various tests are performed by designing and configuring the slip versus torque characteristics of the three-phase squirrel-cage conductive motor 5 in accordance with the characteristics between various tires and road surfaces.

For example, the three-phase squirrel cage conductive motor 5 can be configured to have a torque speed curve corresponding to the friction coefficient/slip characteristics of the tires 4 as illustrated in FIG. 7 when the road surface is icy.

In such a device, the torque generated from the road surface during driving is
It is produced by induction machine 5 on the test bench. In principle, the induction machine 5 is directly connected to the wheel hub (without wheels and tires), and the slippage between the tire 4 and the roller 3 that occurs on the test bench is replaced by a slippage in the rotating magnetic field of the induction machine 5. In the induction machine 5, the slip is the difference between the rotating magnetic field of the stator and the rotor speed, and wear does not occur. Furthermore, in the induction machine 5, there is no need for the control device to adjust the relationship between torque and slip. Here, the slip vs. torque characteristic of the induction machine 5 is the seventh
As illustrated in the figure, the parameters are synchronous speed and maximum torque.

During the test, the road surface or friction coefficient is changed by changing the power supply voltage and frequency, and a star/delta switching machine is used to create different friction coefficients for the right tire 4 and the left tire 4. Can be simulated subject to limitations.

In other words, the road surface for the development and testing of the drive force slip regulator (DSR) allows the induction machine 5 to be operated as a generator at a speed above the synchronous speed.

Under such operating conditions, the torque/speed characteristics of the induction machine correspond to the sliding characteristics of the tires 4 on ice.

For example, in an acceleration test in first gear, the car's engine is driven to a speed that exceeds the synchronous speed of the induction machine. In this case, the induction machine operates as a generator, returning power to the power source.

If you press the car's gas pedal too hard, you will exceed the maximum torque of the electric motor, causing the wheels to spin, just as they would in real life.

In this simple way, the drive slip adjustment device (D
SR) tests are possible.

D0 Problems to be Solved by the Invention In the test bench apparatus as described above in which a sliding element is separately provided, there are problems in that the structure is complicated, the number of parts increases, and a large space is required.

Furthermore, in the case of using the three-phase squirrel-cage conductive motor mentioned above,
The maximum torque of the induction machine and the slippage at that point correspond to the point at which the tire starts to slip.

This device adapts to various road surface conditions by changing the position and size of the point at which the induction machine starts to slide. However, when a three-phase squirrel cage conductive motor is used, the magnitude (Tm) of the slipping point shown in FIG. 7 can be changed by adjusting the voltage. However, the position (Sm) of the sliding point cannot be changed. Therefore, the position (Sm) of this sliding point is changed, and induction machines adapted to various road surface conditions are individually prepared in advance and used as appropriate to adapt to various road surfaces. For this reason, there was a problem in that the -1000 induction machine could not be adapted to various road surfaces.

In view of the above points, the present invention has developed a new four-wheel test bench device that has a simple structure, a small number of parts, does not require a large installation space, and can be adapted to various road conditions with a single induction motor. The purpose is to provide

E3 Means for Solving Problems The four-wheel test bench device of the present invention is configured such that the roller that contacts the tire is driven by a three-phase wound induction motor, and voltage adjustment is applied to the primary side of the three-phase wound induction motor. Set up the equipment,
It is characterized in that a variable resistor and a wire-wound resistor having a permanent magnet as an iron core are connected to the secondary side thereof.

F4 action With the above configuration, when testing with this device, characteristics for different road surfaces can be adjusted by adjusting the variable resistance on the secondary side to adjust the slip at the maximum torque point, and The winding resistance makes it possible to flatten the torque/slip characteristics of the induction machine, making it similar to the friction coefficient/slip characteristics when the road surface is in a water surface state, allowing for good testing. Furthermore, the magnitude of the maximum torque of the induction machine can be adjusted by a voltage regulator provided on the primary side.

G. Example Hereinafter, one example of the four-wheel test bench device of the present invention will be described as a first example.
This will be explained with reference to FIGS. 3 to 3. Note that in FIGS. 1 to 3, parts corresponding to the conventional example shown in FIGS. 4 to 7 described above are given the same reference numerals, and detailed explanation thereof will be omitted.

Fig. 1 is a schematic explanatory diagram of the main parts of this example device, in which 6 is a three-phase wound induction motor, 3 is a roller, 7 is a voltage regulator on the primary side, and 8 is a variable resistor on the secondary side. be. The roller 3 contacts a tire (not shown) and is rotated by an induction machine 6.

The voltage regulator 7 is a commonly used IVR.

Consists of transformers, etc. The voltage regulator 7 is used to adjust the maximum torque of the induction machine 6 by adjusting the voltage regulator 7.

The variable resistor 8 is connected to the secondary side of the induction machine 6, and is configured as an external resistor having saturation characteristics.

That is, the variable resistor 8 includes a grid resistor 9 and a wire-wound resistor 10.

The grid resistance is variable and is used to adjust the slippage of the maximum torque point of the induction machine 6.

The wire-wound resistor 10 is a wire-wound resistor with an iron core, as shown in FIG.
, an alnico magnet 12 (a ferrite magnet, a cobalt magnet, etc. may also be used), which is a permanent magnet, is arranged as an iron core. When a large current flows through this wire-wound resistor 10, the alnico magnet 12 becomes saturated and its resistance increases.

By adding the winding resistance 10 to the variable resistor 8 as described above, the torque/slip characteristics of the induction machine 6 can be changed from the solid line 15 in the case where the winding resistance 10 is not applied in FIG. 3 to the winding resistance 10. For example, the characteristics can be adjusted to have any characteristic within the range up to the broken line 16 by applying This makes it possible to respond to

It should be noted that the present invention is not limited to the above-mentioned embodiments,
Of course, various other configurations may be adopted without departing from the gist of the present invention.

H9 Effects of the Invention As detailed above, according to the four-wheel test bench device of the present invention, the roller that contacts the tire is driven by a three-phase wound induction motor, and the primary A voltage regulator is installed on the side, and a variable resistor and a wire-wound resistor with a permanent magnet as an iron core are connected to the secondary side of the voltage regulator. can be performed by adjusting the variable resistance on the secondary side to adjust the slip at the maximum torque point.

In addition, the winding resistance can flatten the torque/slip characteristics of the induction machine, making it similar to the friction coefficient/slipping characteristics when the road surface is icy, making it possible to perform tests well.

Furthermore, the magnitude of the maximum torque of the induction machine can be adjusted by a voltage regulator installed on the primary side, so that the -100 induction machine as a whole can respond to various road conditions without using a slip element. This has the effect of making the test more executable.

In addition, this device has a simple structure, has a small number of parts, and does not take up a lot of space, so it has the effect of reducing overall costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the main part of an embodiment of the four-wheel test bench device of the present invention, Fig. 2 is a perspective view of the main part of the winding resistance, and Fig. 3 is the torque/slip line of the device. 4 is a schematic explanatory diagram of an example of a conventional four-wheel test bench device, FIG. 5 is a friction/slip diagram for various road surface conditions, and FIG. 6 is a diagram showing another example of a conventional four-wheel test bench device. The schematic explanatory diagram shown in FIG. 7 is its torque/slip diagram. 3... Roller, 4... Tire, 6... Three-phase wound induction motor, 7... Voltage regulator, 8... Variable resistor, 9
...Grid resistance, 10.. Winding resistance, 11.. Coil, 12.. Alnico magnet. Outside 1 name Ribbon Yami■艷Ryaku〉Seikou Meihi Figure 1, 8 coins coffin resistance 0 Gun Seizu Peijun, Sword Figure 2 Figure 5

Claims (1)

[Claims] (1) In a four-wheel test bench device in which a three-phase wound induction motor drives the rollers that contact the tires of a test vehicle, a variable resistor is installed on the secondary side of the three-phase wound induction motor;
A four-wheel test bench device comprising: a wire-wound resistor having a permanent magnet as an iron core; and a voltage regulator connected to the primary side of the wire-wound resistor.