IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0009403
(2001-03-03)
|
우선권정보 |
DE-0013965 (2000-03-21) |
국제출원번호 |
PCT/EP01/02437
(2001-03-03)
|
국제공개번호 |
WO01/71307
(2001-09-27)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Hayes Lemmerz Holding GmbH
|
대리인 / 주소 |
Fay, Sharpe, Fagan, Minnich & McKee
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
1 |
초록
▼
A control method and apparatus for a biaxial wheel test stand for simulating driving loads. The test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic horizontal load cylinder for adjusting a horizontal force, and a pivot he
A control method and apparatus for a biaxial wheel test stand for simulating driving loads. The test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic horizontal load cylinder for adjusting a horizontal force, and a pivot head which can be adjusted by means of a camber cylinder for adjusting the camber angle of a wheel to be tested. The test stand further including a drive unit with a driven drum having starting rings, to which the wheel to be tested is pressed with the load units, wherein the vertical load cylinder and the horizontal load cylinder control the forces and the camber cylinder controls the camber angle. The method including the steps of adjusting the horizontal force, the vertical force and the camber angle in dependence on the wheel radial force land the wheel side force which were determined during a road test, and using the position of the point of application of the resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle.
대표청구항
▼
1. A method of controlling a biaxial wheel test stand for simulating driving loads, the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal force, and a pivot head which can be adj
1. A method of controlling a biaxial wheel test stand for simulating driving loads, the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal force, and a pivot head which can be adjusted by means of a camber cylinder about a head pivot point for adjusting the magnitude of a camber angle of a wheel to be tested, the test stand further including a drive unit with a driven drum having starting rings, the wheel to be tested being pressed against the starting rings pressed with the load unit, whereby the vertical load cylinder and the horizontal load cylinder are adjusted by controlling the vertical and horizontal forces respectively and the camber cylinder by controlling the angle, said method including the steps of adjusting the horizontal force, the vertical force and the camber angle based on the wheel radial force and the wheel side force previously determined during a road test, and using the position of a point of application of a resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle. 2. A method of controlling a biaxial wheel test stand for simulating driving loads the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal force, and a pivot head which can be adjusted by means of a camber cylinder about a head pivot point for adjusting the magnitude of a camber angle of a wheel to be tested, the test stand further including a drive unit with a driven drum having starting rings, the wheel to be tested being pressed against the starting rings pressed with the load unit, whereby the vertical load cylinder and the horizontal load cylinder are adjusted by controlling the vertical and horizontal forces respectively and the camber cylinder by controlling the angle, said method including the steps of adjusting the horizontal force, the vertical force and the camber angle based on the wheel radial force and the wheel side force previously determined during a road test, using the position of a point of application of a resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle, and measuring the force of the camber cylinder and using the measured camber force as the control magnitude for determining the point of the application of the resulting force. 3. The method of controlling according to claim 2 wherein the point of application of the resulting force is spaced a distance from the wheel center. 4. The method of controlling according to claim 3 further including the step of calculating the resulting force distance of the point of application of the resulting force by means of the equation R os =( M Fs +Fa×R dyn )/ Fr−a 1 whereinM Fs : the moment of the camber cylinder force around the head pivot point;Fa: the axial wheel side force from the road test;Fr: the wheel radial force from the road test;R dyn : the dynamic roll radius; and,a1: a distance between the head pivot point and the tire center. 5. The method of controlling according to claim 4 further including the step of adjusting the vertical force, the horizontal force and the camber angle by means of a control or evaluation unit, until an unambiguous solution for the equations is reached R DS =( M Fs +Fa×R dyn )/ Fr−a 1; Fv=−Fr −cos( y ) +Fa ×sin( y ) and Fh=−Fr× sin( y )× Fa× cos( y )whereinR DS : the resulting force distance;M Fs : the moment of the camber cylinder force around the head pivot point;Fa: the axial wheel side force from the road test;R dyn : the dynamic roll radius;Fr: the wheel radial force from the road test;a1: the distance between the, head pivot point and the tire center;Fv: the vertical force; and,Fh: the horizo ntal force. 6. The method of controlling according to claim 5 further including the step of approximating the position of the resulting force application point by setting the resulting force distance to zero. 7. A method of controlling a biaxial wheel test stand for simulating driving loads, the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal force, and a pivot head which can be adjusted by means of a camber cylinder about a head pivot point for adjusting the magnitude of a camber angle of a wheel to be tested, the test stand further including a drive unit with a driven drum having starting rings, the wheel to be tested being pressed against the starting rings pressed with the load unit whereby the vertical load cylinder and the horizontal load cylinder are adjusted by controlling the vertical and horizontal forces respectively and the camber cylinder by controlling the angle, said method including the steps of adjusting the horizontal force, the vertical force and the camber angle based on the wheel radial force and the wheel side force previously determined during a road test, using the position of a point of application of a resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle, and calculating the resulting force distance of the point of application of the resulting force by means of the equation R DS =( M Fs +Fa×R dyn ) /Fr−a 1whereinM Fs : the moment of the camber cylinder force around the head pivot point;Fa: the axial wheel side force from the road test;Fr: the wheel radial force from the road test;R dyn : the dynamic roll radius; and,a1: a distance between the head pivot point and the tire center. 8. A method of controlling a biaxial wheel test stand for simulating driving loads, the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal force, and a pivot head which can be adjusted by means of a camber cylinder about a head pivot point for adjusting the magnitude of a camber anile of a wheel to be tested, the test stand further including a drive unit with a driven drum having starting rings, the wheel to be tested being pressed against the starting rings pressed with the load unit, whereby the vertical load cylinder and the horizontal load cylinder are adjusted by controlling the vertical and horizontal forces respectively and the camber cylinder by controlling the angle, said method including the steps of adjusting the horizontal force, the vertical force and the camber angle based on the wheel radial force and the wheel side force previously determined during a road test, using the position of a point of application of a resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle, and adjusting the vertical force, the horizontal force and the camber angle by means of a control or evaluation unit, until an unambiguous solution for the equations is reached R DS =( M Fs +Fa×R dyn )/ Fr−a 1 Fv=−Fr ×cos( y )+ Fa ×sin( y ) and Fh=−Fr ×sin( y )− Fa ×cos( y ),whereinR DS : the resulting force distance;M Fs : the moment of the camber cylinder force around the head pivot point;Fa: the axial wheel side force from the road test;R dyn : the dynamic roll radius;Fr: the wheel radial force from the road test;al: the distance between the: head pivot point and the tire center;Fv: the vertical force; and,Fh: the horizontal force. 9. A method of controlling a biaxial wheel test stand for simulating driving loads, the test stand including a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force, a servo-hydraulic load cylinder for adjusting a horizontal forc e, and a pivot head which can be adjusted by means of a camber cylinder about a head pivot point for adjusting the magnitude of a camber angle of a wheel to be tested, the test stand further including a drive unit with a driven drum having starting rings, the wheel to be tested being pressed against the starting rings pressed with the load unit, whereby the vertical load cylinder and the horizontal load cylinder are adjusted by controlling the vertical and horizontal forces respectively and the camber cylinder by controlling the angle, said method including the steps of adjusting the horizontal force, the vertical force and the camber angle based on the wheel radial force and the wheel side force previously determined during a road test, using the position of a point of application of a resulting force of the wheel radial force and the wheel side force as the control magnitude for the camber angle, and approximating the position of the resulting force application point by setting the resulting force distance to zero. 10. A wheel test stand for simulating driving loads on a vehicle wheel, said test stand comprising a load unit having a servo-hydraulic vertical load cylinder for adjusting a vertical force on the wheel, a servo-hydraulic horizontal load cylinder for adjusting a horizontal force on the wheel, and a pivot head which can be adjusted by means of a servo-hydraulic camber cylinder for adjusting the camber angle of the wheel; a drive unit having a driven drum with starting rings, to which the wheel can be pressed by means of the load unit; a control and evaluation unit for adjusting the horizontal force, the vertical force and the camber angle; and a measuring unit connected to the camber cylinder which measures a camber cylinder force acting on the camber cylinder. 11. The wheel test stand according to claim 10 wherein the measuring unit consists of a capsule-type dynamometer connected to the camber cylinder.
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