Dynamic Analysis of Transmission Torque Utilizing the Lever Analogy

Hall, M.; Dourra, Hussein

doi:10.4271/2009-01-1137

Cited by 11 publications

(7 citation statements)

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“…This approach greatly simplifies the required calculations to synthesize the performance attributes of a given transmission design during a shift event when compared to other methods presented by [8,9,10,11,12]. The equations of motion for the free body diagram contained in Figure 4 are summarized in the following two sections.…”

Section: Simplified Automatic Transmission Modelmentioning

confidence: 98%

“…(9), with output power equal to the difference in net transmission input power and oncoming clutch power of Eq. (8). The power loss associated with the torque phase can be minimized by selecting a transmission design that facilitates lower clutch torques with numerically smaller values of R c and lower relative slip speed across the clutch.…”

Section: Torque Phasementioning

confidence: 99%

“…The oncoming clutch operates with a given amount of slip across its friction surfaces determined by the kinematics of the automatic transmission powerflow. As a result, power is lost as heat transferred to the transmission fluid, clutch plates and surrounding transmission components proportionate to the product of oncoming clutch torque and relative slip across the clutch, (8) A power balance of the torque phase is shown in Figure 5 and provided by Eq. (9), with output power equal to the difference in net transmission input power and oncoming clutch power of Eq.…”

Section: Torque Phasementioning

confidence: 99%

See 2 more Smart Citations

Performance Characterization of Automatic Transmission Upshifts with Reduced Shift Times

Robinette

Gibson

Szpara

et al. 2015

SAE Int. J. Engines

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As the number of fixed gear ratios in automatic transmissions continues to increase in the pursuit of powertrain system efficiency, particular consideration must continue to be focused on optimizing the design for shifting performance. This investigation focuses on the effect of shift time on the performance attributes of shift quality, durability, on schedule fuel consumption and enablers to further reduce shift time. A review of fundamental design features that enable reduced shift times in both planetary and dual clutch transmissions is presented along with key operating features of both the transmission and engine/prime mover. A lumped parameter metric is proposed to assess and compare the upshift controllability of new transmission architectures and powerflows using simple analysis. The durability of fast shift times during performance maneuvers are quantified through calculation of shifting clutch energy and power from analysis and form measurements on a powertrain dynamometer. In addition to perceived powertrain performance, powertrain dynamometer measurements running the FTP test schedules fuel consumption trends with respect to inertia phase shift time and can provide upwards of 1.25% by optimization of shift times depending on powertrain details. The paper concludes with vehicle measurements comparing part and wide-open throttle shift times for 6 and 8 speed planetary automatics transmissions.

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Section: Simplified Automatic Transmission Modelmentioning

confidence: 98%

Section: Torque Phasementioning

confidence: 99%

Section: Torque Phasementioning

confidence: 99%

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Performance Characterization of Automatic Transmission Upshifts with Reduced Shift Times

Robinette

Gibson

Szpara

et al. 2015

SAE Int. J. Engines

View full text Add to dashboard Cite

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“…The lever analogy is a powerful tool to visualize the states of complex PGTs. 22 Lever equilibrium of the compound planetary power-split system is shown in Figure 2. Four vertical axes represent PGS1, PGC1, PGR1 and PGS2, respectively.…”

Section: Mode Transition Descriptionmentioning

confidence: 99%

Investigation of mode transition coordination for power-split hybrid vehicles using dynamic surface control

Zhang

Zhou

et al. 2019

Proceedings of the IMechE

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For passenger cars propelled by the dedicated compound power-split hybrid powertrain, driveline oscillations-induced vehicle jerks are often excited during clutch-to-clutch shift operations while drive mode changes. To tackle this issue, a coordinated dynamic surface control is developed by integrating clutch slips and motor torque compensation strategies through trajectories tracking of both clutch slip speed and wheel speed. Uncertainties or disturbances are treated to be additional inputs of the system, and model nonlinearities are considered and implemented in discretized form through lookup tables. A complex simulation model including electro-hydraulic system is proposed and validated via experiments. The coordinated controller is validated by collaborative simulation. Numerical examples are made and simulation results verify that the controller is effective and robust enough against parameters uncertainties.

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“…An energy approach was adopted in [113]. [6] used the lever analogy for modeling complex mechanical pathways in a transmission, an approach that has been widely used in engineering practice because of its graphical nature and appeal to intuition [101,38]. Methods involving tables and signal flow graphs were used in [93] and [114] respectively, for performing the kinematic analysis of a planetary gear set.…”

Section: Powertrain Modelingmentioning

confidence: 99%

Robust nonlinear estimation and control of clutch-to-clutch shifts

Mishra

Srinivasan

2016

2016 American Control Conference (ACC)

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Shift quality is an integral component of drivability. Thus, with the extension of feedback control to more powertrain functions, it is of paramount importance that systematic and robust control methods be developed for ensuring good shift quality. Increasingly, automatic transmissions employ a combination of two actively controlled clutches to implement shifts, which makes the gearshifts clutch-to-clutch shifts. In the current study, a model-based approach is presented for the development of a robust clutch-to-clutch shift controller. A detailed nonlinear model of the powertrain consisting of engine, torque converter, transmission system, and vehicle dynamics is developed. The transmission system consists of mechanical and hydraulic subsystems. While the mechanical subsystem is easier to model, the hydraulic subsystem, commonly referred to as shift hydraulic system, is usually challenging to model due to high dynamic order and significant nonlinearities. Starting from a high order nonlinear model of the shift hydraulic dynamics, developed from first principles in an earlier study, we apply systematic methods to arrive at a lower order control-oriented model, and use it to develop a closed loop clutch pressure controller. Specifically, state-space averaging and singular perturbation techniques were used to achieve this. The reduced order model was validated against experimental measurements.

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Dynamic Analysis of Transmission Torque Utilizing the Lever Analogy

Cited by 11 publications

References 0 publications

Performance Characterization of Automatic Transmission Upshifts with Reduced Shift Times

Performance Characterization of Automatic Transmission Upshifts with Reduced Shift Times

Investigation of mode transition coordination for power-split hybrid vehicles using dynamic surface control

Robust nonlinear estimation and control of clutch-to-clutch shifts

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