Hierarchical control strategy for a hybrid hydro-mechanical transmission (HMT) power-train

Kai Loon Cheong, Zhekang Du, Perry Y. Li, Thomas R. Chase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations


A hydraulic hybrid passenger vehicle using a Hydro-mechanical Transmission (HMT) or power-split architecture is being developed as a testbed within the Center for Compact and Efficient Fluid Power. In this paper, the design and experimental implementation of a three-level hierarchical control approach for this vehicle with a second generation hardware are presented. This control strategy segregates the tasks of the drive-train into three layers that respectively 1) manages the accumulator energy storage (high level); 2) performs vehicle level optimization (mid-level); and 3) attains the desired vehicle operating condition (low level). Different high level energy management strategies can be employed without affecting the mid and low level controllers. Two 'high level' energy management strategies have been implemented and experimentally tested initially, a continuously variable transmission (CVT) strategy used as a baseline for comparison, and a rule based hybrid strategy. Results illustrate that the mid and low level power-train control satisfy the driver's demand and the efficiency is dependent on the energy management used.

Original languageEnglish (US)
Title of host publication2014 American Control Conference, ACC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Print)9781479932726
StatePublished - 2014
Event2014 American Control Conference, ACC 2014 - Portland, OR, United States
Duration: Jun 4 2014Jun 6 2014

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


Other2014 American Control Conference, ACC 2014
Country/TerritoryUnited States
CityPortland, OR

Bibliographical note

Copyright 2014 Elsevier B.V., All rights reserved.


  • Automotive
  • Control applications
  • Fluid power control


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