US Patent No. 10,161,328

MANAGING SKIP FIRE PHASE TRANSITIONS


Patent No. 10,161,328
Issue Date December 25, 2018
Title Managing Skip Fire Phase Transitions
Inventorship Louis J. Serrano, Los Gatos, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,161,328

1. A method of altering the phase of a firing sequence during operation of an engine having a plurality of working chambers at a first firing fraction that is less than one, the method comprising:(a) determining whether a selected working chamber firing decision is consistent with a firing decision that would be made when the firing sequence is in a desired phase; and
(b) when it is determined that the selected working chamber firing decision is not consistent with the firing decision that would be made when the firing sequence is in the desired phase, at least sometimes, adjusting the phase of the firing sequence, wherein adjusting the phase takes place while the engine continues to operate at the first firing fraction; and
(c) repeating steps (a) and (b) as necessary at least until the desired phase is attained, wherein steps (a) and (b) are performed using a first order sigma delta converter during operation of the engine at the first firing fraction; and
whereby the phase of the firing sequence is altered from a first phase to the desired phase, wherein adjusting the phase of the firing sequence while the engine continues to operate at the first firing fraction is accomplished by adding an offset value to an accumulator in the sigma delta converter.