Study on clutch engagement judder during launch process for dual clutch transmissions

Zhang, Jinle; Ma, Bin; Zehn, Manfred

doi:10.1504/ijvnv.2010.036685

Cited by 16 publications

(14 citation statements)

References 17 publications

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“…Most research studies have focused on and widely investigated the self-excited vibration that occurs during the clutch engagement process [4]- [9]. Current research studies state that the self-excited vibration of the clutch is significantly related to the variation of the friction coefficient with the relative speed, and occurs when the du/dv has a negative gradient, where, u is the friction coefficient and v is the relative speed.…”

Section: These Two Kinds Of Vibration Cause Torsional Oscillation Inmentioning

confidence: 99%

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Wang

et al. 2020

IEEE Access

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The vibration caused by the friction characteristic of the clutch during the vehicle start-up process has an impact on driveline torsional oscillation. This results in the occurrence of the stick-slip phenomenon which in turn aggravates the torsional oscillation. In this study, the dynamic model of the wet clutch was built and the self-excited vibration and stick-slip phenomenon during clutch engagement were theoretically analyzed and numerically simulated. The vehicle start-up driveline model was then built with consideration of the stiffness of the shafts, the time-varying mesh stiffness of the gear set, and system damping. The start-up process of the vehicle was simulated through the adoption of a constant engine speed control strategy, and the influence of the control and structure parameters on the stick-slip phenomenon during the vehicle start-up process was investigated. The results showed that increasing the relative speed threshold value of the constant engine speed control decreases the likelihood of the occurrence of the clutch stick-slip action, and the shaft stiffness, system damping, and inertia of each component also affect the stick-slip phenomenon during vehicle start-up.

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Section: These Two Kinds Of Vibration Cause Torsional Oscillation Inmentioning

confidence: 99%

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Wang

et al. 2020

IEEE Access

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“…It includes six cushion springs (5) between two friction plates (4) designed with local axial stiffness in order to ensure desired engagement smoothness, and torsional vibration damper used to attenuate engine torsional vibration (not shown in this paper). Clutch cover assembly is fastened on flywheel (3) by bolts, in which clutch cover (10) and pressure plate (2) are fixed together by three link strips (6) along the circumferential direction. Therefore, clutch cover (10) and diaphragm spring (8) and pressure plate (2) are rotated synchronously with engine flywheel 3, and a diaphragm spring (8), located between clutch cover (10) and pressure plate (2), transforms release bearing position into corresponding position of pressure plate (2) that is in contact with diaphragm spring terminal, as shown in Figure 4.…”

Section: Dry Clutch Systemmentioning

confidence: 99%

“…In addition, vehicle start-up judder can also be related to a number of influence factors that result in nonuniform interface pressure distribution on clutch plates, such as external motivation: lateral excitations of engine crankshaft, fluctuations of clutch operating force, 9,10 start-up mode; installation and manufacturing error: misalignments between clutch components, face run-out between contact surfaces; thermal effect: hot spot, 11 uneven thermal expansion, 12,13 temperature-varying frictional coefficient. 14 Menday et al 11 researched the hot spots found at the inner and outer radii of the clutch friction plate from judder complaint vehicles.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Yuan

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper presents a detailed investigation of the dry clutch engagement process, and vehicle start-up judder phenomenon that could result in the deterioration of vehicle ride comfort. Elasto-plastic friction model is elaborated through the slider-pulley system, which shows some friction characteristics such as presliding, stick-slip motion, Stribeck effects, etc., and applied to dry clutch. The axial compression characteristics of three elastic parts, which include diaphragm spring, cushion spring, and link strip have been taken into consideration, and nonlinear relationship between the release bearing travel and the clutch clamp force is also established. The powertrain system model of front-engine and front-wheel-drive vehicle equipped with manual transmission is set up to recreate the start-up judder phenomenon in the numerical simulation and analyze its mechanism. The sudden transfer of the engine torque during the clutch engagement process results in the initial judder, which can be supposed as the step response of system and is initially weakened due to the damping of the powertrain system. Then the judder gradually strengthens and gets in the most severe vibrance when the clutch is about to get in to the fully engaged state, which is related to the frictional characteristics that forms a closed-loop positive feedback system, as well as the frequent state transitions between sliding state and engaged state. The positive slope of Stribeck effect as well as the reduction of absolute value of negative slope can both effectively suppress the start-up judder, and the apparent judder occurs only if the negative slope is outside of a certain range, instead of in all of the range. In addition, the fluctuation of clutch clamp force can aggravate the start-up judder, in which a more chaotic oscillation is emerged.

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“…Yang et al 3 showed the influence of the engine torque excitation on clutch judder. Zhang et al 4 presented a system analytical model for clutch engagement judder during launch for the vehicles equipped with DCT. Gkinis et al 5,6 investigated the effect of clutch lining frictional characteristics on take-up judder.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al. 4 presented a system analytical model for clutch engagement judder during launch for the vehicles equipped with DCT. Gkinis et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation on adaptive method of torque characteristic in dual clutch transmission during launch phase

Huang

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part K:

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To reduce sliding friction work and clutch judder, an adaptive method of torque characteristic in dual clutch transmission during launch phase is presented in this paper. The proposed approach provides a tool to identify the change of torque characteristic and adapt it in real time. Firstly, to reduce the influence of the error between the nominal engine torque and the actual engine torque, the estimator based on the extended Kalman filter is designed to estimate the transmitted torque of the dual-clutch transmission during launch phase. Furthermore, the torque characteristic adaptive method is presented by a combination of the estimator with the improved Least Square Method. Then, based on the established driveline model of the dual-clutch transmission, the torque characteristic adaptive method during launch phase is validated by MATLAB/Simulink. Finally, in order to further evaluate the application potential of the adaptive method, the experiments are conducted on a production vehicle equipped with the wet dual-clutch transmission. The simulation and experiment results show that the proposed algorithms work well.

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Study on clutch engagement judder during launch process for dual clutch transmissions

Cited by 16 publications

References 17 publications

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Investigation on adaptive method of torque characteristic in dual clutch transmission during launch phase

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