Analysis of Unconventional Powertrain Systems

Format:

Conference/Event

Author/Creator:

Weber, Weber, author.

Conference Name:

22nd FISITA Congress (2002-07-21 : ., Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1988

Summary:

A system optimization approach has been developed to configureand analyze hydraulic energy-storage based propulsion systems. Thepowertrain synthesis problem is formulated as an optimizationproblem of minimizing the engine fuel rate over a finite timeinterval. The solution process is driven by energy management andcontrol strategies, which determine the transmission ratio and thehydrostatic pump/motor unit displacement such that the engine canbe operated at its minimum fuel rate.This approach has identified a powertrain consisting of anautomatic four-speed transmission plus a hydrostatic pump/motorunit and accumulator used to regenerate and store vehicle kineticenergy. Within the limitations of our analysis, the hydraulichybrid system has shown potential for significant improvement infuel economy over a conventional system. These limitations are: theuse of an optimum energy management strategy which may be difficultto capture in a real-time controller; the practicality andtransient effects of turning the engine on and off; the packagingof all the subsystems into a vehicle; and the lack of hydraulicnoise assessment. Using the approach in this paper, optimal energymanagement and control strategies have been developed and theireffects on fuel economy have been quantified. The analysis hasshown that the fuel economy gains are due to turning the engine onand off and to using stored energy to power the accessories and/orlaunch the vehicle.This research effort has assessed the potential of a hydraulichybrid powertrain vehicle system. Bounds on the predicted fueleconomy gain were determined as a function of sensitivities tosubsystem parameters

Notes:

Vendor supplied data

Publisher Number:

885023

Access Restriction:

Restricted for use by site license