US 11,719,175 B2
Motor torque smoothing on combustion engines by approximating a periodic waveform using sinusoids
Louis Joseph Serrano, Los Gatos, CA (US); and Vijay Srinivasan, Farmington Hills, MI (US)
Assigned to Tula Technology, Inc., San Jose, CA (US)
Filed by Tula Technology, Inc., San Jose, CA (US)
Filed on Jul. 19, 2022, as Appl. No. 17/867,797.
Application 17/867,797 is a continuation of application No. 17/466,888, filed on Sep. 3, 2021, granted, now 11,421,613.
Application 17/466,888 is a continuation of application No. 17/138,116, filed on Dec. 30, 2020, granted, now 11,143,125, issued on Oct. 12, 2021.
Prior Publication US 2022/0349357 A1, Nov. 3, 2022
Int. Cl. F02D 17/02 (2006.01); F02D 41/30 (2006.01); F02D 41/00 (2006.01)
CPC F02D 41/0087 (2013.01) [F02D 17/02 (2013.01); F02D 41/0002 (2013.01); F02D 41/3058 (2013.01); F02D 2041/0012 (2013.01); F02D 2200/101 (2013.01); F02D 2250/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An engine controller in a vehicle for managing motor torque smoothing, the controller configured to:
select a periodic disruptive waveform generated over a period of time to approximate that is associated with the vehicle being at idle; and
determine a first harmonic sinusoid from a group of harmonic sinusoids that reduces the error between an approximated waveform and the disruptive waveform; and
initiate a supplemental quantity of torque during the period of time based on the disruption quantity of torque.