The ZF Automatic Transmission 9HP48 Transmission System, Design and Mechanical Parts

Gaertner, Lutz; Ebenhoch, Michael

doi:10.4271/2013-01-1276

Cited by 28 publications

(9 citation statements)

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“…Transmission output torque during the inertia phase of a shift is determined using: (6) where GR is the gear ratio of the transmission. For a shift event that is oncoming clutch controlled, GR is the upshifted gear ratio, GR f , while for an offgoing clutch controlled shift GR is the initial gear ratio in which the shift is started, GR i .…”

Section: Inertia Phase Equationsmentioning

confidence: 99%

A Two Degree of Freedom, Lumped Inertia Model for Automatic Transmission Clutch-to-Clutch Shift Dynamics

Robinette¹

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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This paper presents a methodology to represent automatic transmission clutch-to-clutch shift dynamics with a two degree of freedom, lumped inertia model. The method of reducing the automatic transmission to a lumped, two inertia model as a function of shift and input shaft acceleration is detailed using a full kinematic representation of the automatic transmission. For a given clutch-to-clutch shift maneuver there are two dependent equations that utilize the two lumped inertias and represent the response of the transmission system from input to output shaft. Applicability of the method is shown for planetary automatic and layshaft dual clutch transmissions. Typical clutch-to-clutch shift maneuvers are illustrated with the two inertia model for power on upshifts and downshifts. The simplification of automatic transmission shift dynamics using this method enables rapid synthesis of a given transmission powerflow for estimation of shift quality potential, required clutching torques, inertia phase engine torque intervention and output torque through all phases of a shift event.

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Section: Inertia Phase Equationsmentioning

confidence: 99%

A Two Degree of Freedom, Lumped Inertia Model for Automatic Transmission Clutch-to-Clutch Shift Dynamics

Robinette¹

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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“…A continuously variable transmission can best match the engine and the entire vehicle, but the expected increase in fuel economy and acceleration performance has not been achieved in many cases [22]. Attempts to increase the efficiency of the conventional planetary gear-type automatic transmission with a torque converter have been made through increasing the number of gears and lockup clutches [23]. It is very complex.…”

Section: Introductionmentioning

confidence: 99%

Simulation Calculation of the Magnetic Torque of Dual Mode Permanent Magnet Transmission Based on Magnetic Circuit Analysis

Zheng-yao

Ying

2019

IEEE Access

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A method of cutting permanent magnets with circular arcs of offset center was proposed on the basis of the principle of similarity under the condition of slip drive to obtain a permanent magnet transmission scheme for low permanent magnet torque fluctuations. The magnetic flux distribution of each region in the magnetic circuit was altered by changing the shape of the permanent magnet. Different magnetic torque curves were obtained by selecting silicon steel sheet with different thicknesses. The relationship between the magnetic flux distribution and the relative rotation angle in the silicon steel sheet was further analyzed, and the direct cause of the influence of the thickness of the silicon steel sheet on the magnetic torque was obtained. The parameters of different eccentric arcs were selected for simulation calculation, and a smooth magnetic torque curve was obtained after fixing the thickness of the silicon steel sheet. On the basis of the results of the former two, the parameters of the eccentric arc were obtained by the magnetic torque value volatility using an approximation method, and the magnetic torque value was measured by making the physical object. According to the results of the simulation and experiment, the permanent magnets with eccentric arcs can be used to obtain the smooth magnetic torque in the range of a 0 •-90 • relative rotation angle, which has a certain application value.

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“…The clutch-to-clutch shift has been the key technology to the modern automated automotive transmissions, such as the dual-clutch transmission (DCTs) 1 and automatic transmission (ATs). 2,3 As the name suggests, during a clutch-to-clutch gear shift, the torque is transferred from the offgoing clutch to the oncoming clutch. 4,5 The coordination of the two clutches needs to be controlled precisely to ensure the driveline torque disturbance to be minimum and acceptable to the customers during the shift under all driving conditions.…”

Section: Introductionmentioning

confidence: 99%

Improved clutch slip control for automated transmissions

Liu

Chen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Clutch slip control of the inertia phase during the clutch-to-clutch shift process is the key to ensure good drive quality in automated transmissions. Addressing the problem of unpleasant driveline jerk and clutch overwear, a novel control scheme consisting of a linear quadratic controller and two compensators is proposed. The compensators are designed to deal with the challenges involving the disturbances and discontinuity in the drivetrain torque during the inertia phase. Compared to the conventional proportional–integral–derivative and classical linear quadratic approaches, the proposed control scheme demonstrates a significant better shift performance in terms of the slipping tracking error and jerk level during shift. The influences of various reference inputs and disturbances are investigated, where the proposed control scheme shows advantages. The proposed control scheme can be adaptable to various engine torque and vehicle load torque with improved control robustness.

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The ZF Automatic Transmission 9HP48 Transmission System, Design and Mechanical Parts

Cited by 28 publications

References 0 publications

A Two Degree of Freedom, Lumped Inertia Model for Automatic Transmission Clutch-to-Clutch Shift Dynamics

A Two Degree of Freedom, Lumped Inertia Model for Automatic Transmission Clutch-to-Clutch Shift Dynamics

Simulation Calculation of the Magnetic Torque of Dual Mode Permanent Magnet Transmission Based on Magnetic Circuit Analysis

Improved clutch slip control for automated transmissions

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