Electrified Dynamic Skip Fire (eDSF) Design and Benefits

Paper #:
  • 2018-01-0864

Published:
  • 2018-04-03
Author(s):
Affiliated:
Abstract:
Tula’s Dynamic Skip Fire (DSF®) technology combines cylinder deactivation and sophisticated cylinder firing control to optimize fuel consumption of spark ignited engines. DSF, which in its ultimate form incorporates anytime, any-cylinder deactivation, continuously varies the number of firing cylinders, along with cylinder load, to obtain flexible control of acoustic and vibrational excitations from the engine, allowing a wide operational envelope. Through careful control of the sequence of combustion events, production level noise and vibration are maintained while operating at the best possible efficiency. Moreover, DSF presents a high value solution for meeting global emissions mandates. The technology has been deployed previously on 8-cylinder vehicles and more recently on 4-cylinder vehicles, showing drive cycle CO2 emissions reductions of 8-15% with no impact on regulated toxic emissions. One feature of dynamic skip-fire operation is active management of perceptible noise and vibration. DSF couples synergistically with mild or micro hybridization, which is projected to be in place in the near future on most vehicles produced. In this electrified DSF or eDSF system, control of motor-generator torque in conjunction operation of the combustion engine expands the zone of operation of skip-fire, allowing further increase in fuel economy. This paper outlines design considerations of eDSF operational strategies, details implementation in a vehicle, presents fuel economy benefits, and discusses NVH and regulated pollutant emission equivalence with baseline vehicles. Further, it discusses opportunities for enhancing engine start and torque response.
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