Mechanism-oriented control for suppressing start-up judder of vehicle with automatic dry clutch: Experiment and simulation analysis

Yuan, Renfei; Wu, Guangqiang; Shao, C. W.; Su, Shaoqin

doi:10.1177/0954407020949479

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…The friction forces generated between the pressure plate (8) and the friction plate (9) act via a cantilever on the screw drive generating both the torsional and bending torque load. The torque reaction support system (3) (a linear ball bearing) is incorporated as an integral part of the vertical servo-axis (Figure 1b), and an additional linear bearing (18) is placed above the force/torque sensor to prevent transfer of the bending torque loads to the screw drive.…”

Section: Design Of Mechanical Subsystemmentioning

confidence: 99%

“…The normal load influence to wear rate was not initially investigated, partly due to the negligible influence of the normal force preliminary observed by using a pin-on-disc tribometer [17], and mostly due to strong shudder vibrations that occurred at mid-high normal load/torque levels. It is worth mentioning that the shudder excitation is characteristic for many dry clutch friction materials in specific operating parameter regions, because of the negative friction force/torque vs. slip speed characteristic, i.e., negative damping coefficient [17,18]. This paper presents a redesign of the disc-on-disc tribometer machine, which is aimed at suppressing the shudder vibrations and, thus, extending its operating range for comprehensive wear and friction characterization.…”

Section: Introductionmentioning

confidence: 99%

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Redesign of a Disc-on-Disc Computer Numerical Control Tribometer for a Wide-Range and Shudder-Resistant Operation

Hoić,

Hrgetić,

Kranjčević

et al. 2023

Machines

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The paper presents a redesign of the custom disc-on-disc-type tribometer intended for the experimental characterization of the friction and wear of automotive dry clutch friction lining. The redesign is aimed at expanding the operating range at which the machine is not sensitive to shudder vibrations. This is achieved through a set of hardware and software upgrade measures. First, the natural frequency of the normal load-generation linear axis of the machine is increased by enlarging its bending stiffness and reducing the suspended mass. The former is realized by replacing the single, two-axial force/torque piezoelectric sensor with a set of three three-axial piezoelectric force sensors, adding a set of stiff linear guides, and reducing the lengths of the cantilevers of lateral forces acting on the linear axis guide system. The latter is accomplished by reducing the overall dimensions of the cooling disc and redesigning the thermal insulation components. The shudder sensitivity resistance is further reduced through individual normal force-readings-based adjustment of parallelism between friction contact surfaces and the increase in the stiffness of eccentrically positioned water-cooling pipes. Finally, the stability of the coefficient of friction and, consequently, the wear process are boosted by adjusting the control routines to minimize the circumferential and/or radial temperature gradients. These adjustments include the introduction of a clutch lock-up interval at the end of the clutch closing cycle, a minimum cooling delay inserted between two closing cycles, and maximum normal force demand of the clutch torque controller. The performance gain of the upgraded tribometer is demonstrated through a study of the dry clutch friction plate static wear experimental characterization for a wide range of operating conditions.

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Section: Design Of Mechanical Subsystemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Redesign of a Disc-on-Disc Computer Numerical Control Tribometer for a Wide-Range and Shudder-Resistant Operation

Hoić,

Hrgetić,

Kranjčević

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…Differences in clutch system parameters, vehicle states, and road conditions all affect clutch launching torque control for vehicles equipped with AMT [17]. In the process of optimizing clutch launching torque, some researchers consider vehicle information and the external environment as disturbances and reduce their uncertainty by designing an optimization controller that improves clutch engagement performance [23]. In [24], an adaptive optimal control algorithm based on the linear quadratic regulator (LQR) theory is designed to estimate the error caused by changes in vehicle parameters using a reduced-order observer of the driveline, so that the optimal control law can engage the clutch quickly and smoothly when the operating conditions of the driveline change.…”

Section: Introductionmentioning

confidence: 99%

Optimal Torque Control of the Launching Process with AMT Clutch for Heavy-Duty Vehicles

Geng,

Liu,

Liu

et al. 2024

Machines

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When launching a heavy-duty vehicle, torque and position control during automatic clutch engagement is critical, and the driver’s intention to launch and changes in the vehicle’s launching resistance make clutch control more complex. This paper analyses the automatic engagement process of automated mechanical transmission (AMT) clutches and proposes an optimal control of the clutch torque for launching heavy-duty vehicles. Firstly, a fuzzy neural network (FNN)-based vehicle launching states recognition (LSR) system is designed for distinguishing the driver’s launching intention and the vehicle’s launching equivalent moment of resistance. Secondly, jerk, friction work, and launching reserve power are taken as the performance indexes for clutch torque optimization, the weight coefficients of each performance index are adjusted according to the LSR results, and the optimal clutch torque is solved by using the minimum value principle based on the shooting method. Finally, simulations and tests are conducted to validate the strategy of optimizing clutch torque, and the impact of torque optimization on the position change during the engagement process is analyzed. The results indicate that under different driver’s intentions, vehicle masses, and road gradient conditions, the jerk, friction work, and slipping time of heavy vehicles during the launching process are improved by applying the optimization strategy.

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“…Li et al [21] examined the judder behavior of a centrifugal clutch from the start of hot spots in the conformal contact, then the repeated developments of thermoelastic instability, and finally the formation of cyclic undulations in the vibrations, friction coefficient, and torque. Yuan et al [22,23,24] explored the mechanism of the vehicle start-up judder that seriously deteriorates ride comfort and then proposed a mechanism-oriented control strategy to cut off the introduction process of negative damping caused by the Stribeck effect for suppressing the vehicle start-up judder. The core idea of the mechanism-oriented control strategy is to cut off the positive-feedback closed loop, which is achieved by fine-tuning the position of the release bearing and finally the judder-suppression performance behaves well both in simulation and in the experiment.…”

Section: Introductionmentioning

confidence: 99%

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

Yan

Lei³

et al. 2023

Chin. J. Mech. Eng.

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The friction judder characteristics during clutch engagement have a significant influence on the NVH of a driveline. In this research, the judder characteristics of automobile clutch friction materials and experimental verification are studied. First, considering the stick-slip phenomenon in the clutch engagement process, a detailed 9-degrees-of-freedom (DOF) model including the body, each cylinder of the engine, clutch and friction lining, torsional damper, transmission and other driveline parts is established, and the calculation formula of friction torque in the clutch engagement process is determined. Second, the influence of the friction gradient characteristics on the amplification or attenuation of the automobile friction judder is analyzed, and the corresponding stability analysis and the numerical simulation of different friction gradient values are carried out with MATLAB/Simulink software. Finally, judder bench test equipment and a corresponding damping test program are developed, and the relationship between the friction coefficient gradient characteristics and the system damping is analyzed. After a large number of tests, the evaluation basis of the test is determined. The research results show that the friction lining with negative gradient characteristics of the friction coefficient will have a judder signal. When the friction gradient value is less than −0.005 s/m, the judder signal of the measured clutch cannot be completely attenuated, and the judder phenomenon occurs. When the friction gradient is greater than − 0.005 s/m, the judder signal can be significantly suppressed and the system connection tends to be stable.

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Mechanism-oriented control for suppressing start-up judder of vehicle with automatic dry clutch: Experiment and simulation analysis

Cited by 7 publications

References 29 publications

Redesign of a Disc-on-Disc Computer Numerical Control Tribometer for a Wide-Range and Shudder-Resistant Operation

Redesign of a Disc-on-Disc Computer Numerical Control Tribometer for a Wide-Range and Shudder-Resistant Operation

Optimal Torque Control of the Launching Process with AMT Clutch for Heavy-Duty Vehicles

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

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