Circulation of Power During Braking of Tyre of Vehicle Wheel On Support Rollers of he Diagnostic Stand

Abstract

The article conducts the study of the circulation of power in the diagnosis of the car on the brake stand that is kinematically connected with the supporting rollers. Case study. It is suggested that the longitudinal displacement of the wheel operating in braking mode on two kinematically connected support rollers leads to kinematical misalignment, resulting in circulation of the parasitic power of the N C in a closed loop "tyre-front support roller-chain transmission-rear support rollertyre". Research result. The conditions of the circulating power flow are revealed experimentally, which are explained by the fact that during the braking of the wheel with an elastic tire on the kinematically connected support rollers of the stand, as a result of kinematical misalignment, there is circulation of the parasitic power of the N C in a closed loop "tire-front support rollerchain transmission-rear support roller-tire". Conclusion. It is found that the circulation of parasitic power is formed regardless of the presence of the displacement of the wheel, but varies depending on the variation of the displacement value a and the normal load G K on the wheel. The occurrence of circulating parasitic power N C occurs in the driven mode of rolling the wheel, when S=0 it increases to a value S=0,1, upon reaching which it falls. The magnitude of spurious circulating power N C takes a minimum value when the slippage is S≥ ≥ ≥ ≥0,7. It is established that the circulating power values N C can be commensurate with the value of the braking power N T .

Braking force measurement errors on a stand with horizontal support discs

“…Each module of the stand consists of a frame (1) with bores (2), guides (3) for vertical movement of the frame, fixed stationary. On each frame is mounted a support disc (4) with an axis (5) resting on a tapered bearing (6). The drive of rotation of the support disc is made in the form of an electric motor (motor-reducer) (7) placed outside the contour of the frame and mounted balanced, flexible gear (belt) transmission (8), the leading sprocket (9) of which is placed on the shaft (10) of the electric motor, the driven (11) -on the axis (5) of the drive of rotation of the support disc.…”

“…A sensor ( 14) is mounted on a special bracket for continuous determination of the position of the wheel rotation plane of the diagnosed axis of the vehicle relative to the axis of rotation of the support disc. The frame rests on a vibration platform (15) with a weight (collision) sensor (16) mounted thereon, additional weight sensors (16´) are also placed between the frame and the support bearing (6) of the disc (4). The vibration pad (15) rests on the connecting rod of the crank mechanism (17) to make vertical oscillations.…”

Traction control and diagnostics of electric and unmanned vehicles on roller stands

“…Not all stands with running drums and the methods they implement reflect the traction properties of cars correctly [8][9][10]. More or less correct and informative parameters from the diagnostic point of view are provided by power stands.…”

Aspects of Measuring Brake Parameters on Heavy Trucks Using a Roller Brake Stand

“…The literature contains a significant number of articles dealing with the construction [1], operation [2,3] and analysis [3][4][5] of roller stands. However, there are quite a few studies that analyze the results obtained from the tests on the stand.…”

“…Adhesion control can be effectively studied on roller stands, and Xiangdang X, et al in [1], presents such an experiment that links the measurements on the proposed stand to the rotation sensors of the ABS system to determine the adhesion in different conditions. Other studies [4,5] address the sizing of a roller brake stand so that it can provide the most complex analysis data possible.…”