JP4695994B2 - Chassis dynamometer vehicle fixing device - Google Patents

Description

  The present invention relates to a technique for fixing a vehicle to a chassis dynamometer.

In a chassis dynamometer that measures the various characteristics of an automobile by rotating the drive wheels of a car on a roller, the car is fixed on the roller after the car is correctly positioned on the roller, and the test and measurement are performed. There is a need to do.
As a technique for fixing the vehicle in such a chassis dynamometer, a technique for fixing the idle wheel of the vehicle with a belt wound around the idle wheel is known (for example, Patent Document 1).
Further, as a technique for fixing a vehicle in such a chassis dynamometer, a technique of connecting a pole installed in front (or rear) of a vehicle and a front part (or rear part) of the vehicle with a chain is also known. (For example, patent document 2).
Japanese Patent Laid-Open No. 10-267798 JP-A-10-307082

The above-described technology for fixing the idle wheels of a vehicle with a belt wound around the idle wheels cannot be applied to fixing a four-wheel drive vehicle in which all four wheels are drive wheels.
On the other hand, the technology for fixing the vehicle by connecting the front and rear parts of the vehicle and the poles installed at the front and rear of the vehicle with a chain can also be applied to fixing a four-wheel drive vehicle. Such a fixing method has a small effect of stabilizing the position of the vehicle with respect to a vertical force, and the force acting between the roller and the driving wheel of the car during operation of the chassis dynamometer that rotates the roller. In some cases, the vehicle cannot be stably fixed.

  Therefore, an object of the present invention is to provide a vehicle fixing device for a chassis dynamometer that can stably fix an automobile even during operation of the chassis dynamometer.

  In order to achieve the above object, the present invention provides a vehicle fixing device for fixing a vehicle on which a driving wheel is mounted on the roller of a chassis dynamometer including a roller on which the driving wheel of the vehicle is mounted. A lift-up device that lifts up the vehicle body on which the drive wheels are mounted on the vehicle, a vehicle height measurement device that measures the height of the vehicle body lifted up by the lift-up device, and a roller that drives the roller. During the operation of the chassis dynamometer, the height of the vehicle body measured by the vehicle height measuring device is acquired, and is measured by the vehicle height measuring device according to the acquired height of the vehicle body of the vehicle. The lift-up operation of the vehicle body of the lift-up device is controlled so that the height of the vehicle body of the vehicle matches the preset appropriate fixing height of the vehicle body of the vehicle. Is constructed by including a fixed control device for.

  More specifically, such a chassis dynamometer vehicle fixing device includes, for example, a contact block that makes the lift-up device contact a jack-up point of a body of the automobile, and the roller. A guide unit that supports the contact block so that the contact block can be moved in the front-rear and left-right directions of the vehicle on which the driving wheel is mounted and can be fixed at an arbitrary movement position; and a lift mechanism unit that moves the guide unit up and down using hydraulic pressure You may make it comprise. In this case, the vehicle height measuring device measures the vertical movement amount of the guide portion as an amount representing the height of the vehicle body of the automobile, and the fixed control device includes the lift mechanism portion. The lift-up operation of the vehicle body of the lift-up device may be controlled by controlling the hydraulic pressure.

  According to the vehicle fixing device of the chassis dynamometer as described above, the vehicle body is lifted up using the lift-up device within a range in which the resistance between the roller and the wheel can be sufficiently secured, and the vehicle is tested. be able to. And by doing in this way, it becomes possible to absorb the impact applied from the wheels to the vehicle body part by the suspension during the test of the vehicle driven by the rotation of the roller, and to fix the vehicle more stably. Become.

  Further, in the vehicle dynamometer such as these, the height of the vehicle body supported by the lift-up device is monitored during the operation of the chassis dynamo whose rollers are driven to rotate. When the height deviates from the appropriate height, the lift-up operation of the lift-up device is controlled so that the height of the vehicle body of the automobile returns to the appropriate height. Therefore, even during the operation of the chassis dynamometer, it is possible to suppress a change in the vertical position of the vehicle body due to the force acting between the roller and the vehicle wheel and to stably fix the vehicle body. As a result, accurate measurement can be performed by the chassis dynamometer.

  By the way, it is also preferable to further provide a plurality of belt fixing devices in the vehicle fixing device for the chassis dynamometer. Here, each of the belt fixing devices includes a belt whose one end is connected to a vehicle body lifted up by the lift-up device, and a belt fixing portion that fixes the other end of the belt fixedly installed. It is.

  By providing such a belt fixing device, the vehicle can be stably fixed also in the horizontal direction.

  As described above, according to the present invention, the vehicle can be stably fixed even while the chassis dynamometer is in operation.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 schematically shows the configuration of the chassis dynamometer according to this embodiment.
Here, FIG. 1a is a schematic top view of the chassis dynamometer, and FIG. 1b is a schematic side view of the chassis dynamometer.
As shown in the figure, this chassis dynamometer is a chassis dynamometer for a four-wheel drive vehicle. The vehicle is advanced on the fuselage 1, the front wheel is positioned on the front wheel roller 2, and the rear wheel is rear-mounted. After positioning on the wheel roller 3, the vehicle is fixed to the drive unit 1, and the fixed vehicle is connected to the front wheel roller 2 and the rear wheel roller 3 while running the fixed vehicle. Various characteristics of automobiles are measured with a dynamometer.

Here, the fixing of the automobile to the driving body 1 is performed using four belt fixing devices 4, a total of two lift-up devices 5 arranged on the left and right of the driving body 1, and a fixing control device 6. .
Hereinafter, the configuration of the belt fixing device 4 will be described.
Here, two belt fixing devices 4 out of the four belt fixing devices 4 are arranged in the left and right directions in front of the region occupied by the positioned vehicle, as indicating the front and rear left and right directions using the front and rear left and right directions of the automobile to be fixed. The remaining two belt fixing devices 4 are arranged at intervals in the left-right direction behind a region that is approximately occupied by the positioned automobile.

  Each of the two belt fixing devices 4 arranged in front of the area occupied by the positioned automobile includes a fixing belt 41 connected to a fixing hook fixed to the front of the automobile, and a winding fixed to the driving body 1. A device 42 is provided. Here, this winding device is a device that winds up the fixed belt 41 in an arbitrary amount, feeds out an arbitrary amount, or fixes the fixed belt 41 in a state of winding up the arbitrary amount.

  Similarly, each of the two belt fixing devices 4 arranged behind the area occupied by the positioned vehicle is similarly provided with a fixing belt 41 connected to a fixing hook fixed to the front of the vehicle, and a winding device 42. ing. In addition, as a fixed hook fixed to the vehicle, a tow hook of an automobile may be used if possible.

The configuration of the belt fixing device 4 has been described above.
Next, the lift-up device 5 will be described.
FIG. 2 shows the configuration of the lift-up device 5. In the figure, a represents the upper surface of the lift-up device 5, b1 and b2 represent the left side of the lift-up device 5 toward the rear of the vehicle, and c1 and c2 represent the rear of the lift-up device 5. It looks like the front.

  Now, as shown in the figure, the lift-up devices 5 provided on the left and right sides of the drive unit 1 have symmetrical structures, and are arranged on the jack device 51, the arm portion 52, and the arm portion 52, respectively. Adjustment bar 53, and two contact blocks 54 arranged on the upper part of the adjustment bar 53.

  The jack device 51 of each lift-up device 5 is fixed to the driving body 1, and the arm portion 52 extending on the upper surface of the driving body 1 is moved up and down as shown by broken lines and arrows in FIGS. 2b2 and c2. Moving. In addition, as a moving mechanism of the arm part 52 of such a jack apparatus 51, the jack mechanism using hydraulic pressure is used. The jack device 51 is fixed with a linear encoder 55 that measures the amount of movement of the arm portion 52 in the vertical direction relative to the jack device 51, that is, the amount of change in the height of the arm portion 52.

Next, the adjustment bar 53 of each lift-up device 5 is supported by the arm unit 52 so as to be movable in the left-right direction of the automobile and fixed at an arbitrary position in the left-right direction, as indicated by broken lines and arrows in FIGS. Has been.
Each abutment block 54 is supported by the adjustment bar 53 so as to be movable in the front-rear direction of the automobile and to be fixed at an arbitrary position in the front-rear direction as shown by broken lines and arrows in FIGS. In addition, a touch sensor 56 is provided on the upper surface of the contact block 54 for sensing the contact of the automobile with the upper surface.

  Now, returning to FIG. 1, the fixed control device 6 is connected to the touch sensor 56 and the linear encoder 55 of the lift-up device 5 as described above, and acquires these outputs. Further, the fixed control device 6 is connected to the jack device 51 of each lift-up device 5 as described above, and the arm by the jack device 51 is controlled by controlling the hydraulic pressure that the jack device 51 uses to move the arm portion 52. The movement of the unit 52 is controlled.

Hereinafter, a vehicle fixing operation in such a chassis dynamometer will be described.
When fixing the vehicle, first, the operator operates the jack device 51 to move the arm portion 52 of each lift-up device 5 to the lowermost position, and then advances the automobile onto the fuselage 1. Then, as shown in FIG. 1, the front wheel is positioned on the front wheel roller 2 and the rear wheel is positioned on the rear wheel roller 3.
Then, the adjustment bar 53 of each lift-up device 5 is moved with respect to the arm portion 52, and the contact block 54 of each lift-up device 5 is moved with respect to the adjustment bar 53, for a total of four contact blocks 54. Are positioned directly below the four jack-up points on the left and right sides of the car body. In this state, each contact block 54 is fixed to the adjustment bar 53, and each adjustment bar 53 is fixed to the arm portion 52.

And the vehicle height restraint process of the fixed control apparatus 6 is started, and the said fixed control apparatus 6 is made to perform the said process.
Here, the procedure of this vehicle height restraint process is shown in FIG.
As shown in the figure, in this process, the fixing control device 6 first controls the jack device 51 of each lift-up device 5 to raise the arm portion 52, and the upper surface of the contact block 54 of the lift-up device 5. When the touch sensor 56 provided on the touch panel senses contact with the vehicle, the arm unit 52 is stopped at that position (step 302).

And in this state, the linear encoder 55 which acquired the height of the arm part 52 which the linear encoder 55 of each lift-up apparatus 5 is measuring, and acquired the height is provided. The reference height of the lift-up device 5 is set (step 304).
Next, for each lift-up device 5, the jack unit 51 is controlled while referring to the measurement value of the linear encoder 55 of the lift-up device 5, and the arm unit 52 is set to the lift-up device 5. A process of moving to a position higher than the reference height by a predetermined height (for example, several centimeters) is performed (step 306). Even if the vehicle body is lifted up by several centimeters, the suspension of the automobile only extends a few centimeters, and each wheel of the vehicle has a certain load on the roller 2 for the front wheel and the roller 3 for the rear wheel. Stay in touch.

  Now, in this state, the operator connects the front ends of the fixing belts 41 of the four belt fixing devices 4 to fixing hooks fixed to the front and rear parts of the automobile, respectively, The fixing belt 41 is wound and fixed so as to be tensioned, and the fixing of the vehicle is completed.

  In this state, when the operation of the chassis dynamometer starts, the worker inputs that fact to the fixed control device 6. When the start of operation of the chassis dynamometer is notified from the operator (step 308), the fixed control device 6 repeats the following processing.

  That is, the fixed control device 6 acquires the measured value of the linear encoder 55 of the lift-up device 5 for each lift-up device 5 (step 310), and the height relative to the reference height of the lift-up device 5 represented by the measured value. And the jack device 51 so that the height relative to the reference height of the lift-up device 5 represented by the measurement value acquired from the linear encoder 55 matches the predetermined height according to the difference between the predetermined height and the predetermined height. (Step 312) is repeated. The height relative to the reference height of the lift-up device 5 represented by the measurement value of the linear encoder 55 is the height of the vehicle body at the jack point where the lift-up device 5 provided with the linear encoder 55 is lifted up. Will be expressed.

  More specifically, in step 312, the height obtained by subtracting the reference height set in the lift-up device 5 from the height represented by the measurement value acquired from the linear encoder 55 is set as the controlled height. The above-described predetermined height is set as the target height, and feedback control is performed to control the jack unit 51 so that the arm unit 52 moves in an amount corresponding to the difference between the controlled height and the target height and the difference. When the controlled height, that is, the height of the arm portion relative to the reference height is larger (above) than the target height, the control performed on the jack device 51 raises the arm portion 52 in the jack device 51. The hydraulic pressure is controlled to be reduced by an amount obtained by multiplying the difference by a predetermined gain. When the controlled height, that is, the height relative to the reference height of the arm portion is smaller than the target height (if it is below), the jack device 51 The control to be performed is control to increase the hydraulic pressure for raising the arm portion 52 in the jack device 51 by an amount obtained by multiplying the difference by a predetermined gain.

The embodiment of the present invention has been described above.
As described above, according to the present embodiment, the vehicle can be lifted up and tested in the vehicle using the lift-up device 5 within a range in which the resistance between the roller 2/3 and the wheel can be sufficiently secured. Therefore, the impact applied to the vehicle body from the wheels during the test of the vehicle driven by the rotation of the roller 2/3 can be absorbed more by the suspension of the automobile, and the vehicle can be fixed more stably.

  During operation of the chassis dynamo in which the roller 2/3 is driven to rotate, the height at which the vehicle body is supported by the lift-up device 5 is monitored, and the height deviates from the predetermined height. In this case, feedback control is performed to control the hydraulic pressure of the jack device 51 so that the height of the vehicle body of the automobile returns to a predetermined height. Therefore, according to the present embodiment, during the operation of the chassis dynamometer, the vertical position change of the vehicle body due to the force acting between the roller 2/3 and the vehicle wheel is suppressed, so that the vehicle can be stably operated. As a result, it is possible to perform highly accurate measurement with the chassis dynamometer.

It is a figure which shows the structure of the chassis dynamometer which concerns on embodiment of this invention. It is a figure which shows the structure of the lift-up apparatus which concerns on embodiment of this invention. It is a flowchart which shows the vehicle high restraint process which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive body, 2 ... Roller for front wheels, 3 ... Roller for rear wheels, 4 ... Belt fixing device, 5 ... Lift-up device, 6 ... Fixing control device, 41 ... Fixed belt, 42 ... Winding device, 51 DESCRIPTION OF SYMBOLS ... Jack apparatus, 52 ... Arm part, 53 ... Adjustment bar, 54 ... Contact block, 55 ... Linear encoder, 56 ... Touch sensor.

Claims (4)

A chassis dynamometer provided with a roller for mounting a driving wheel of an automobile, a vehicle fixing device for fixing an automobile having a driving wheel mounted on the roller,
A lift-up device that lifts up a vehicle body of a vehicle on which driving wheels are mounted on the rollers;
A vehicle height measuring device for measuring the height of the vehicle body lifted up by the lift-up device;
During operation of the chassis dynamometer performed by driving the roller, the height of the vehicle body measured by the vehicle height measurement device is acquired, and according to the acquired height of the vehicle body of the vehicle, The lift-up operation of the vehicle body of the lift-up device is controlled so that the height of the vehicle body measured by the vehicle height measurement device matches a preset appropriate fixed height of the vehicle body of the vehicle. A vehicle dynamometer fixing device for a chassis dynamometer, comprising: a fixing control device.
A vehicle fixing device for a chassis dynamometer according to claim 1,
The lift-up device includes an abutment block that abuts against a jack-up point of a body of the automobile, and an abutment block that can move the abutment block in the front-rear and left-right directions of the automobile with driving wheels mounted on the rollers And a lift mechanism that moves the guide up and down using hydraulic pressure. A chassis dynamometer vehicle fixing device.
A vehicle fixing device for a chassis dynamometer according to claim 2,
The vehicle height measuring device measures the amount of vertical movement of the guide unit as an amount representing the height of the vehicle body,
The vehicle fixing device for a chassis dynamometer, wherein the fixing control device controls a lift-up operation of the vehicle body of the lift-up device by controlling a hydraulic pressure of the lift mechanism unit.
A vehicle dynamometer vehicle fixing device according to claim 1, 2 or 3,
Having a plurality of belt fixing devices;
Each belt fixing device is
A belt having one end connected to a vehicle body lifted by the lift-up device;
A vehicle fixing device for a chassis dynamometer, comprising: a belt fixing portion that fixes the other end of the belt fixedly installed.