JPH051977A - Testing device for four-wheel travel state - Google Patents

Abstract

PURPOSE:To enable four wheels to be concurrently rotated for a simulated travel test by making a wheel placement roller movable back and forth for one of front and rear axles, and providing a caterpillar mechanism movable concurrently with the roller and permitting the passage of a vehicle thereon. CONSTITUTION:Four rollers 3 are provided in such a way as permitting the four wheels of a tested vehicle 1 to be placed thereon, and respectively provided with motors 4a and 4b. Also, the rollers 3 are so placed as to oppose driven rollers 31. Regarding one of front and rear axles, the rollers 3 are made movable in the lengthwise direction of the vehicle 1, and the movable range of either axle is so made as to correspond to the motion of the rollers 3. Also, a caterpillar mechanism 5 is provided to permit the travel of the vehicle 1 thereon, and a drive means 6 is provided to cause the motion of the vehicle 1 and caterpillar mechanism 5. The rollers 3 corresponding to four wheels are independently given different rotation speed via a program controlled circuit. According to this construction, a simulated travel test can be undertaken, assuming a possible effect on respective tires 8 during travel on a road.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in automobile production lines. INDUSTRIAL APPLICABILITY The present invention is used for a simulated running test performed on a vehicle manufacturing line by rotating wheels while the vehicle being manufactured is substantially stopped.

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

[0003]

2. Description of the Related Art In an automobile manufacturing line, a vehicle that is almost completed at a position close to its final process is tested by rotating the wheels while the vehicle is stopped on the manufacturing line to create a simulated running state. It is necessary to do. The device for this purpose has rollers on which wheels for front and rear axles are placed at test positions on the manufacturing line.While the wheels are placed on the rollers, the rollers are rotated to rotate the wheels. By rotating.

In general, there are various types of vehicles manufactured on one production line, and the distance between the front axle and the rear axle (wheel base) differs for each vehicle type. Since the rollers for the running condition test installed on the production line cannot be provided for various vehicle models with different wheelbases, this test device in the simulated running condition has conventionally been composed of a pair of rollers. Then, only the front wheels and then only the rear wheels are used. The axle wheels that are not mounted on the rollers are on the floor and are kept stationary. That is, it was possible to test two wheels but not four wheels at the same time. For this reason, road tests have been conducted on vehicles equipped with an antilock brake system (ABS) and four-wheel drive vehicles.

[0005]

In addition to being dangerous, a road test requires a very large test area in a straight running test. Road tests are not possible at high speeds. In addition, the number of man-hours for testing increases.

In recent years, ABS has been installed in large vehicles, and some vehicles will soon be obliged by a legal system. In the ABS test, it is necessary to actually create a state in which the front and rear four wheels are simultaneously rotating at the same speed, as in the case of traveling on a straight road. In other words, when the ABS is operating normally, a difference in the rotational speed of the four wheels is detected, and automatic control is performed to recover the skid as if it had occurred. Tests performed in the state in which they cannot actually create the state where they are rotating at the same speed or the desired speed required for the test are not correct operation tests.

The present invention has been made against 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 in a production line, and with respect to various types of vehicles having different wheel bases produced in the production line, four wheels are simultaneously and at a constant speed while the vehicle under test is substantially stopped. It is an object of the present invention to provide a test device that can be rotated by a temperature to create a simulated straight running state. Further, the present invention is a test capable of creating a simulated abnormal running state in which the four wheels of the vehicle under test are simultaneously rotated at different speeds when necessary while the vehicle under test is substantially stopped. The purpose is to provide a device.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, the front and rear wheels and rear rear wheels (a total of four front wheels and a total of two rear wheels) of a vehicle under test are mounted on a substantially high floor surface. 4
In a four-wheel-running test apparatus having four rollers, each of which has a motor for rotationally driving the four rollers, the roller is provided in the front-rear direction of the vehicle under test with respect to one of the front shaft and the rear shaft. A movable structure, at least the movable range of the roller, which is movable with the movement of the roller, the surface of which is set to approximately the floor height, and the vehicle under test can travel on the surface. A mechanism and a driving means for moving the roller are provided.

The drive means includes a drive motor for driving the caterpillar, a reversing control circuit for switching and controlling a power supply current for applying forward rotation and reverse rotation to the drive motor, and a program for controlling the reversing control circuit. A control circuit, a memory circuit for storing control contents of the program control circuit, and an operation end for operating the program control circuit are included, and the memory circuit has a setting position of the roller corresponding to a vehicle type of a vehicle under test. The program control circuit includes control means for determining the set position according to the vehicle type information input to the operation end and moving the rollers to the set position, and for rotating the four rollers. The motor to be driven is an AC motor whose rotational speed is frequency responsive, and an inverter that supplies a drive current to this AC motor. , And a control circuit for changing and controlling the output AC frequency of the inverter, further comprising a sensor for optically detecting the rotation of the wheel mounted on the roller, the sensor output is taken into the control circuit, The control circuit includes means for calculating the tire diameter from the frequency of the sensor output and the frequency of the inverter output, a rubber pad is provided in the vicinity of the roller, and the rubber pad is in contact with a wheel placed on the roller. A control means for controlling the remote state can be provided.

[0010]

This device is installed at a position near the end of the manufacturing line and at a stage where the manufactured vehicle is ready to run by itself. Next, when the vehicle type information of the vehicle under test arriving at the test apparatus is input, the positions of the caterpillar and the roller are changed by the drive motor and set according to the wheel base of the vehicle under test.

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

The vehicle to be tested leaves the conveyor and is driven by a worker on the floor surface of the production line to move forward and reach the test apparatus. The caterpillar is at the same height as the floor,
The vehicle under test runs on the track and both front and rear axle wheels are mounted on their respective rollers. The rubber pad is lowered, the vehicle under test is released from the brake, and the transmission gear is set to the neutral state.

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

In the series of tests described above, the vehicle under test is stopped near the end of the manufacturing line and does not have to actually run.

After the completion of the test, the rubber pads of the four wheels are raised so as to be in contact with the wheels, respectively, and the vehicle under test is driven by the worker to move forward by himself and leave the test apparatus, and the next test on the production line is performed. Move to position or final exit.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a side view showing a configuration of an embodiment of the present invention, FIG. 2 is a plan view showing a configuration of an embodiment of the present invention, FIG. 3 is a block diagram showing a configuration of a reverse rotation control system of a 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 substantially at the height of the floor surface 2 so that both the front axle wheels and the rear axle wheels of the vehicle under test 1 are placed, and each of the four rollers 3 is provided. Motors 4a and 4b for rotating and driving this roller are provided. The roller 3 has a structure in which front and rear wheels, rear 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.
The structure is paired with 1. The driven roller 31 is driven according to 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 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 a caterpillar mechanism 5 on the surface of which the vehicle under test 1 can travel, and a drive means 6 for moving the caterpillar mechanism 5 and the roller 3.

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

The motors 4a and 4b for rotationally driving the four rollers 3 are frequency responsive AC motors, and are equipped with a rectifier 16 and inverters 15a and 15b for supplying a drive current to the AC motors. , The program control circuit 12 with the inverters 15a and 1
A control circuit for changing and controlling the output AC frequency of 5b is included.

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

A pair of rollers 3 for mounting both wheels of the rear axle are installed on a roller base 21, and both ends of the roller base 21 are connected to the caterpillars 5a, respectively, and their supporting parts are slid on two rails 22. It is movably engaged. Further, the roller base 21 has a motor 4 for driving one roller 3 thereof.
b and the position sensor 10 for detecting the position are attached.

The widths of the roller 3 and the caterpillar 5a are made wide enough so as to correspond to the vehicle widths of different vehicle types.

Next, the operation of the embodiment of the present invention thus constructed will be described. FIG. 5 is a flow chart showing the flow of the control operation of the program control circuit in the embodiment of the present invention.

Operation end (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 vehicle type position map stored in the memory circuit 13 in accordance with the vehicle type information, and mounts the vehicle 1 under test. It is determined by the detection signal sent from the position sensor 10 whether or not there is the roller base 21 at the position.

When the roller base 21 is in the predetermined position, the operation end 14 can be tested as it is.
Is displayed on the display panel of. When the roller base 21 is not in the predetermined position, a control signal is sent to the reverse rotation control circuit 11.

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

Upon receiving the detection signal, the program control circuit 12 confirms whether or not the roller base 21 has stopped at a predetermined position, and if the roller base 21 has stopped at the predetermined position, the running condition test can be performed. This is displayed on the display panel of the operating end 14. When it is not stopped at the predetermined position, the same operation is repeated.

In this way, the rollers 3 are set at the positions of both the front axle wheels and the rear axle wheels of the vehicle under test 1, and the tires 8 of the vehicle under test 1 are placed on the rollers.
When a predetermined test instruction is input from the operating end 14, the program control circuit 12 carries out 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, the program control circuit 12 controls the front-axis inverter 15a and the rear-axis inverter 15b,
By this control, the inverters 15a and 15b are set to AC3.
The DC power source is taken out from the rectifier 16 which receives the phase power source as an input, and is supplied to the motors 4a and 4b as a variable frequency output.

The rollers 3 corresponding to the four wheels can be individually given different rotational speeds under the control of the program control circuit 12, so that a test is conducted in which the effects of the respective tires 8 on the road surface are assumed. Can be done on a regular basis. Further, the rubber pad 9 can give running resistance not only by pushing up the tire to push the vehicle out of the roller but also by pushing it against the tire 8, and by changing the strength of the pushing, the tire 8 and the road surface can be changed. It is possible to perform a 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 that of the roller 3. However, the diameter of the roller 3 can be made considerably large and the diameter of the driven roller 31 can be set small. . In this case, the driven roller 31 for the rear shaft only (or for the front shaft only, or both shafts)
The structure can be omitted.

[0032]

As described above, according to the present invention, the four wheels are simultaneously rotated while the vehicles of various types having different wheel bases manufactured on the manufacturing line are stopped, and the vehicle is simulated in a straight running state. It is possible to produce a normal state and an abnormal running state by rotating the wheels at the same speed or at different speeds.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

1 Vehicle under test 2 floor 3 roller 4a, 4b motor 5 Track mechanism 5a caterpillar 6 Drive means 6a drive motor 7 Rotation sensor 8 tires 9 rubber pad 10 Position sensor 11 Reverse control circuit 12 Program control circuit 13 Memory circuit 14 Operation end (operation / display panel) 15a Inverter (for front shaft) 15b Inverter (for rear axle) 16 Rectifier 21 Roller stand 22 rails 31 Driven roller

Claims (5)

[Claims] 1. A four-roller is provided substantially at the height of the floor so that both the front axle wheels and the rear axle wheels of the vehicle under test are placed, and the rollers are rotated by each of the four rollers. In a four-wheel-running test apparatus equipped with a motor for driving, the roller is movable in the front-rear direction of the vehicle under test for one of the front shaft and the rear shaft, and at least for the movable range of the roller, the roller is A track mechanism that is movable with movement, has a surface set to substantially the floor height, and on which the vehicle under test can travel, and a drive unit that moves the track mechanism and the roller. A test device for four-wheel running condition. 2. The drive means includes a drive motor for driving the caterpillar, a reverse rotation control circuit for switching and controlling a power supply current that gives forward rotation and reverse rotation to the drive motor, and the reverse rotation control circuit is controlled. A program control circuit, a memory circuit for storing control contents of the program control circuit, and an operating end for operating the program control circuit, wherein the memory circuit corresponds to the vehicle type of the vehicle under test. 2. The four-wheeled vehicle according to claim 1, wherein a set position is stored, and the program control circuit includes control means for determining the set position according to vehicle type information input to the operation end and moving the roller to the set position. Running condition test equipment. 3. A motor for rotationally driving the four rollers is an AC motor whose rotational speed is frequency responsive,
The four-wheel running state test apparatus according to claim 1, further comprising: an inverter that supplies a drive current to the AC motor; and a control circuit that changes and controls the output AC frequency of the inverter. 4. A sensor for optically detecting rotation of a wheel mounted on the roller is provided, and the sensor output is taken into the control circuit, and the control circuit has a frequency of the sensor output and the inverter output. The four-wheel running test apparatus according to claim 3, further comprising means for calculating a tire diameter from the vehicle. 5. A four-wheel running state according to claim 1, wherein a rubber pad is provided in the vicinity of the roller, and control means is provided for controlling the rubber pad to be in contact with and away from a wheel mounted on the roller. Test equipment.