Launch and Driveability Performance Enhancement for a Parallel Hybrid with a Torque Controlled IVT

Cacciatori, Enrico; Bonnet, B.; Vaughan, N. D.; Burke, Matthew; Price, D.; Wejrzanowski, Krzysztof

doi:10.4271/2005-01-3831

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The provision of torque at the crankshaft output during the highly dynamic launch phase is crucial, especially considering technologies like start-stop and turbochargers. Simulation models have been developed to calculate this transient behavior [19][20][21]. Manual transmissions require the driver to control the engagement of the clutch.…”

Section: Introductionmentioning

confidence: 99%

Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

2021

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The calibration of conventional, hybrid and electric drivetrains is an important process during the development phase of any vehicle. Therefore, to optimize the comfort and dynamic behavior (known as driveability), many test drives are performed by experienced drivers during different driving maneuvers, e.g., launch, re-launch or gear shift. However, the process can be kept more consistent and independent of human-based deviations by using objective ratings. This study first introduces an objective rating system developed for the launch behavior of conventional vehicles with automatic transmission, dual-clutch transmission, and alternative drivetrains. Then, the launch behavior, namely comfort and dynamic quality, is compared between two conventional vehicles, a plug-in hybrid electric vehicle and a battery electric vehicle. Results show the benefits of pure electric drivetrains due to the lack of launch and shifting elements, as well as the usage of a highly dynamic electric motor. While the plug-in hybrid achieves a 10% higher overall rating compared to the baseline conventional vehicle, the pure electric vehicle even achieves a 21% higher overall rating. The results also highlight the optimization potential of battery electric vehicles regarding their comfort and dynamic characteristics. The transitions and the gradient of the acceleration build-up have a major influence on the launch quality.

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Section: Introductionmentioning

confidence: 99%

Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

2021

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“…The launch behaviour for a parallel hybrid electric vehicle with an automatic transmission has been investigated and improved using changes in the control strategy in reference [6]. The launch behaviour and driveability improvements for a mild-hybrid vehicle with infinitely variable transmission (IVT) have been described in reference [7]. However, in the case of a start-stop vehicle with a conventional starter motor, the solutions for improving launch behaviour are limited because of hardware constraints.…”

Section: Introductionmentioning

confidence: 99%

Optimization potential of the vehicle launch performance for start—stop micro-hybrid vehicles

Dhand¹,

Cho²,

Walker³

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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One of the primary features of a micro-hybrid vehicle is the automatic shutdown and restart of the engine to avoid engine idling when the vehicle is at rest. The system strategy and its calibration have important significance for the driveability of the vehicle in terms of the vehicle launch behaviour.An unsatisfactory vehicle launch is defined as an inferior launch performance of the vehicle resulting in a stalled engine, a launch with negative vehicle acceleration, and an aborted engine restart due to the inability of the vehicle to provide torque as demanded by the user. In this research, micro-hybrid system optimization for reduction in the percentage of impaired vehicle launch events in real-world usage has been conducted on a start-stop vehicle. The design for the six-sigma process was followed for the optimization study. A high-fidelity electrical and powertrain system and a longitudinal vehicle dynamics model for a start-stop vehicle have been developed. The model has been validated with experimental data. The drivers' behaviour for vehicle launch events from a customer clinic of start-stop vehicles has been used as an input to the model. Using design of experiments, the system has been optimized to maximize the percentage of successful launch events in real-world usage.

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MG-IVT: An Infinitely Variable Transmission With Optimal Power Flows

Bottiglione

Mantriota

2008

Journal of Mechanical Design

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The infinitely variable transmissions (IVTs) allow the transmission ratio to vary with continuity, offering the possibility of also reaching zero values for the transmission ratio and the motion inversion. In this paper an original infinitely variable transmission system is described (MG-IVT). MG-IVT is made up of the coupling of a continuously variable transmission, a planetary gear train, and two ordinary transmissions with a constant transmission ratio. By means of two frontal clutches, the MG-IVT is allowed to get two different configurations. The main purpose is to get the configurations that make the optimal efficiency of the transmission at different transmission ratios. Kinetic characteristics of single component devices are obtained, and the MG-IVT system’s performance is determined by considering how the efficiency of the component devices change as a function of operating conditions. The advantages of the MG-IVT are therefore shown in terms of power and efficiency in comparison to the traditional IVT.

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Launch and Driveability Performance Enhancement for a Parallel Hybrid with a Torque Controlled IVT

Cited by 4 publications

References 7 publications

Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

Optimization potential of the vehicle launch performance for start—stop micro-hybrid vehicles

MG-IVT: An Infinitely Variable Transmission With Optimal Power Flows

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