The near-future realisation of supervisory control for all vehicle systems will allow a higher degree of complimentary integration between the currently isolated powertrain systems. This paper overviews the main opportunities arising from improved powertrain control facilitated by this emerging control hierarchy and provides a broad review of current and future control strategies. Specific examples of integrated powertrain control are offered to illustrate techniques developed in simulation (Matlab/Simulink) to address three key questions: how to define improved powertrain response for general driveability and driver appeal? When to shift for minimum ''cost''? How to shift to achieve improved shift quality? These illustrations relate to a cost function technique developed for evaluation of powertrain concepts using a method of multiple ideal operating lines with regard to test cycle emission constraints, and real-world considerations of fuel economy, NVH and general driver appeal. The notion of a sub-system module comprising a dynamic description (physical model) and a local control strategy is intrinsic to the structure of supervisory control since it permits the de-coupling of vehicle performance and the activity of the powertrain sub-systems. As an example, simulation is reported for a transmission module with control of clutch pressures for a twin layshaft AMT fitted with an output torque sensor, with additional control of engine torque during the shift to achieve near ''invisible'' ratio transition for a discrete ratio transmission.
Integrated powertrain - control strategy
Integrierte Kraftübertragung - Steuerungsstrategie
2000
27 Seiten, 17 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
Integrated powertrain: control strategy
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