JP2745169B2 - Test equipment for four-wheel driving - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an automobile production line. INDUSTRIAL APPLICABILITY The present invention is used for a simulated running test performed by rotating wheels while substantially stopping a vehicle being manufactured on a vehicle manufacturing line.

The present invention is useful for testing antilock brake systems (ABS).

[0003]

2. Description of the Related Art In a production line of an automobile, a vehicle almost completed at a position close to its final process is tested by rotating the wheels while the vehicle is stopped on the production line to create a simulated running state. It is necessary to do. In the apparatus for this, a roller on which a front shaft and a rear shaft are mounted is arranged at a test position on a production line, and the wheel is rotated by rotating the roller with the wheel mounted on the roller. Is performed by rotating.

In general, there are various types of vehicles manufactured on one manufacturing line, and the distance (wheel base) between the front shaft and the rear shaft is different for each vehicle type. Rollers for the running condition test installed on the production line cannot be provided for various types of vehicles having different wheelbases. Therefore, the test device for the simulated running condition has conventionally been constituted by a pair of rollers. In this method, only the front wheels are used, and then only the rear wheels are used. The wheels of the shaft not mounted on the rollers are on the floor and are stopped. That is, two wheels could be tested, but four wheels could not be tested simultaneously. For this reason, vehicles equipped with an anti-lock brake system (ABS) and four-wheel drive vehicles are subjected to road running tests.

[0005]

The road running test is dangerous, and the test in a straight running state requires an extremely large test area. Road tests cannot be performed at high speeds. In addition, the number of working steps for the test is increased.

[0006] In recent years, ABS has been installed in large vehicles, and some vehicle models will be obligated by the legislation soon. In the ABS test, it is necessary to actually create a state in which the front and rear wheels are simultaneously rotating at the same speed, as in the case of running on a straight road. In other words, when the ABS is operating normally, if there is a difference in the rotational speed of the four wheels, this is detected, and automatic control is performed to recover the skid as if it had occurred. A test performed in a state where it is not possible to actually create a state in which the robot is rotating at the same speed or a desired speed required for the test is not a correct operation test.

The present invention has been made in such a background, and an object of the present invention is to provide a test apparatus which does not require a road running test. INDUSTRIAL APPLICABILITY The present invention can be installed on a production line, and for vehicles of various types having different wheelbases manufactured on the production line, the four wheels are simultaneously driven at a constant speed while the vehicle under test is substantially stopped. It is an object of the present invention to provide a test apparatus capable of creating a simulated straight running state by rotating the test apparatus. Further, the present invention provides a test capable of creating a simulated abnormal running state in which the vehicle under test is substantially stopped and, if necessary, the four wheels of the vehicle under test are simultaneously rotated at different speeds. It is intended to provide a device.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the height of the floor is set so that the front and rear wheels of the vehicle to be tested (two front wheels and two rear wheels in total) are mounted, respectively. Crab 4
A four-wheel running test apparatus comprising four rollers and a motor for driving each of the four rollers to rotate the rollers. In one of the front shaft and the rear shaft, the rollers are arranged in the front-rear direction of the vehicle under test. It is a movable structure that can move at least within the movable range of the roller with the movement of the roller, the surface of which is set to approximately the floor height, and the surface of which the vehicle under test can travel is infinite.
The track mechanism that composes the track and the track mechanism that composes this endless track
A drive mechanism for moving the plate mechanism and the roller , wherein the drive means includes a crawler plate forming the endless track.
The drive motor to be driven and the drive motor
Reverse to switch and control the power supply current giving reverse rotation
Inversion control circuit and program for controlling this inversion control circuit
Control circuit and control contents of this program control circuit are stored.
Operating the memory circuit and the program control circuit
And an operation terminal, wherein the memory circuit includes
The set position of the roller is stored in correspondence with
The gram control circuit receives the vehicle type information input to the operation terminal.
Therefore, the set position is determined, and the set position is
It is characterized by including control means for moving the roller .

The motor for rotating the four rollers is an AC motor whose rotation speed is a frequency-responsive type. The inverter supplies a driving current to the AC motor, and the output AC frequency of the inverter is changed and controlled. A control circuit, further comprising a sensor for optically detecting the rotation of the wheel mounted on the roller, the output of the sensor is taken into the control circuit, the sensor output and the inverter A means for calculating a tire diameter from an output frequency; a rubber pad provided near the roller; and a control means for controlling the rubber pad to be in contact with and away from a wheel mounted on the roller. it can.

[0010]

This device is installed at a position near the end of the production line, at a stage where the manufactured vehicle can run on its own. Next, when the vehicle type information of the vehicle under test arriving at the test apparatus is input, the caterpillar (infinite track) is input.
The positions of the track and the rollers constituting the road) and the rollers are changed by the drive motor and set in accordance with the wheelbase of the vehicle under test.

The widths of the rollers and tracks of this device are made wide enough to accommodate a plurality of different vehicle types.

The vehicle to be tested leaves the conveyor and is driven by an operator on the floor on the production line, travels on its own, and reaches the test device. The caterpillar is at the same height as the floor,
The vehicle under test runs on the tracks, and the front and rear axle wheels are both mounted on respective rollers. The rubber pad is lowered, the brake of the vehicle under test is released, and the transmission gear is set to the neutral state.

First, the four rollers are driven at a constant rotation speed. As an example, a simulated straight running state of 7 km / h is given. In this state, A is connected by an electric test device (detailed description is omitted here) connected to the test terminal of the ABS.
It is tested that the operating state of the BS is normal. Next, according to the test standard of each vehicle type, each wheel is set to a different rotation speed for each wheel, and the operation state of the ABS is tested. 1 on the wheel that rotates by raising the rubber pad
Brake can be applied for each wheel.

In a series of these tests, the vehicle under test does not need to actually travel while being stopped near the end of the production line.

After the test is completed, the rubber pads of the four wheels are raised so as to be in contact with the respective wheels, and the vehicle under test is driven by an operator to move forward and leave the test apparatus, and the next test is performed on the production line. Move to location or final exit.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a side view showing the configuration of the embodiment of the present invention, FIG. 2 is a plan view showing the configuration of the embodiment of the present invention, FIG. 3 is a block diagram showing the configuration of a reverse rotation control system of the drive motor according to the embodiment of the present invention,
FIG. 4 is a block diagram showing the configuration of the current supply system according to the embodiment of the present invention.

Four rollers 3 are provided at approximately the height of the floor surface 2 so that both the front and rear wheels of the vehicle 1 to be mounted are mounted thereon, respectively. Motors 4a and 4b for rotating the rollers are provided. The roller 3 has a structure on which both front and rear wheels and a total of four wheels are mounted. In this embodiment, the four rollers 3 are driven rollers 3 having substantially the same diameter.
It has a structure that makes a pair with 1. The driven roller 31 has a structure that follows the rotation of each wheel, and is not connected to the drive motor 4a or 4b. Further, as a feature of the present invention, the roller 3 is configured to be movable in the front-rear direction of the vehicle under test 1 with respect to one of the front shaft and the rear shaft, and is movable with the movement of the roller 3 at least in the movable range of the roller 3. There is provided a caterpillar mechanism 5 whose surface is set almost at the height of the floor surface 2 and on which the vehicle under test 1 can travel, and a driving means 6 for moving the caterpillar mechanism 5 and the rollers 3.

The driving means 6 includes a driving motor 6a for driving the caterpillar 5a of the caterpillar mechanism 5, a reverse rotation control circuit 11 for switching and controlling a power supply current for giving the driving motor 6a a forward rotation and a reverse rotation. A program control circuit 12 for controlling the reverse rotation control circuit 11, a memory circuit 13 for storing the control contents of the program control circuit 12, and an operation terminal 14 for operating the program control circuit 12
The setting position of the roller 3 is stored in the memory circuit 13 corresponding to the type of the vehicle under test 1, and the program control circuit 12 determines the setting position according to the vehicle type information input to the operation end 14. And a control means for moving the roller 3 to the set position.

The motors 4a and 4b for rotatingly driving the four rollers 3 are frequency-responsive AC motors whose rotation speed is provided with a rectifier 16 for supplying a drive current to the AC motor and inverters 15a and 15b. , The program control circuit 12 has the inverters 15a and 1
5b includes a control circuit for changing and controlling the output AC frequency.

Further, a rotation sensor 7 for optically detecting the rotation of a wheel placed on the roller 3 is provided, and the output of the rotation sensor 7 is taken into the control circuit. Output and inverter 15a,
A means for calculating the diameter of the tire 8 from the output frequency of 15b is provided, a rubber pad 9 is provided near the roller 3, and the program control circuit 12 is in a state where the rubber pad 9 is in contact with a wheel mounted on the roller 3. And a control means for controlling the state to be separated.

A pair of rollers 3 on which both wheels of the rear axle are mounted are mounted on a roller base 21, and both ends of the roller base 21 are connected to the caterpillar 5 a, respectively, and the support part thereof slides on two rails 22. It is movably engaged. The roller base 21 has a motor 4 for driving one of the rollers 3.
b and a position sensor 10 for detecting a position are attached.

The widths of the roller 3 and the caterpillar 5a are made sufficiently wide so as to be compatible with vehicle widths of different vehicle types.

Next, the operation of the embodiment of the present invention configured as described above will be described. FIG. 5 is a flowchart showing a control operation flow of the program control circuit in the embodiment of the present invention.

An operation terminal (operation / display panel) by an operator
When the vehicle type information to be tested is input from 14, the program control circuit 12 refers to the position map of the vehicle type stored in the memory circuit 13 according to the vehicle type information, and places the vehicle under test 1 thereon. It is determined based on the detection signal sent from the position sensor 10 whether or not the roller base 21 is located at the position.

When the roller base 21 is at a predetermined position, it is determined that the running state test can be performed as it is.
Display on the display panel. When the roller base 21 is not at the predetermined position, a control signal is sent to the reverse rotation control circuit 11.

The reverse rotation control circuit 11 supplies an AC current to the drive motor 6a of the drive means 6 in accordance with the control signal to cause the drive motor 6a to rotate forward or reverse, and to rotate the caterpillar mechanism 5
a is moved forward or backward. This caterpillar 5a
The roller base 21 slides on the rail 22 and stops at a predetermined position with the movement of. The position is detected by the position sensor 10 and a detection signal is sent to the program control circuit 12.

Receiving the detection signal, the program control circuit 12 confirms whether or not the roller base 21 has stopped at a predetermined position. If the roller base 21 has stopped at the predetermined position, the running state test can be performed. This is displayed on the display panel of the operation terminal 14. If the vehicle has not stopped at the predetermined position, the same operation is repeated.

In this way, the rollers 3 are set at the positions of the front and rear wheels of the vehicle 1 under test, and the tires 8 of the vehicle 1 are mounted on the rollers, respectively.
When a predetermined test instruction is input from the operation terminal 14, the program control circuit 12 performs a running test on both the front axle and the rear axle of the vehicle under test according to the test program stored in the memory circuit 13.

The driving of the roller 3 for the running test is shown in FIG.
As shown in (5), the program control circuit 12 controls the front axis inverter 15a and the rear axis inverter 15b,
With this control, inverters 15a and 15b
This is performed by extracting DC power from the rectifier 16 that receives a phase power and inputting the DC power to the motors 4a and 4b as a variable frequency output.

The rollers 3 corresponding to the four wheels can be individually given different rotation speeds under the control of the program control circuit 12, so that a test simulating the effect of each tire 8 when traveling on a road surface is simulated. Can be done Further, the rubber pad 9 can give running resistance by pressing the tire 8 in addition to pushing up the tire in order to escape the vehicle from the roller, and by changing the strength of the pressing, the tire 8 and the road surface can be changed. Test including the relationship of friction with The rotation speed of the tire 8 is taken into the program control circuit 12 by the rotation sensor 7.

In the above example, the diameter of the driven roller 31 forming a pair with the roller 3 is substantially equal to the diameter of the roller 3. However, the diameter of the roller 3 can be considerably increased and the diameter of the driven roller 31 can be reduced. . In this case, the driven roller 31 only for the rear shaft (or only for the front shaft or both shafts)
May be omitted.

[0032]

As described above, according to the present invention, in a state where vehicles of various types having different wheelbases manufactured on a manufacturing line are stopped, four wheels are simultaneously rotated to simulate a straight running state. And rotating the wheels at a constant speed or at different speeds, thereby producing normal and abnormal running states.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an embodiment of the present invention.

FIG. 2 is a plan view showing the configuration of the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a reverse rotation control system of the drive motor according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a current supply system according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a control operation flow of a program control circuit in the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 vehicle under test 2 floor 3 roller 4a, 4b motor 5 caterpillar mechanism 5a caterpillar 6 drive means 6a drive motor 7 rotation sensor 8 tire 9 rubber pad 10 position sensor 11 reverse rotation control circuit 12 program control circuit 13 memory circuit 14 operation end (operation・ Display panel) 15a Inverter (for front shaft) 15b Inverter (for rear shaft) 16 Rectifier 21 Roller base 22 Rail 31 Follower roller

Claims (4)

(57) [Claims] 1. A four-roller is provided at approximately the height of the floor so that both front and rear wheels of a vehicle under test are mounted thereon, and the four rollers are rotated by each of the four rollers. In a four-wheel running test device provided with a motor to be driven, the roller is configured to be movable in the front-rear direction of the vehicle under test with respect to one of the front shaft and the rear shaft. An endless track that can move along with the movement, the surface of which is set at almost the floor level, and on which the vehicle under test can travel
A track shoe mechanism constituting a and a driving means for moving the track shoe mechanism and the rollers constituting the endless track, wherein the drive means drives the track shoe constituting the endless track
Drive motor, and a positive rotation and
Reverse rotation control that switches and controls the power supply current that gives reverse rotation
Control circuit and program control to control this reverse rotation control circuit
The circuit and the control contents of the program control circuit are stored.
Operation to operate the memory circuit and this program control circuit
The memory circuit corresponds to the type of the vehicle under test.
The program control circuit stores the set position of the
The set position is determined according to the seed information, and the set position is determined.
A four-wheel running state test apparatus , comprising: a control unit for moving the roller in a position . 2. A motor for rotationally driving the four rollers is an AC motor whose rotational speed is a frequency response type,
2. The four-wheel running state test apparatus according to claim 1, further comprising: an inverter for supplying a drive current to the AC motor; and a control circuit for changing and controlling an output AC frequency of the inverter. 3. A sensor for optically detecting the rotation of a wheel mounted on the roller, an output of the sensor being taken into the control circuit, and a frequency of the sensor output and the frequency of the inverter output being supplied to the control circuit. The four-wheel running test apparatus according to claim 2, further comprising means for calculating the diameter of the tire from (1). 4. A four-wheel running state according to claim 1, further comprising a rubber pad provided near said roller, and a control means for controlling said rubber pad to be in contact with and separated from a wheel mounted on said roller. Testing equipment.