US Patent No. 10,196,995

ENGINE TORQUE SMOOTHING


Patent No. 10,196,995
Issue Date February 05, 2019
Title Engine Torque Smoothing
Inventorship Mohammad R. Pirjaberi, San Jose, CA (US)
Kian Eisazadeh-Far, Berkeley, CA (US)
Steven E. Carlson, Oakland, CA (US)
Ying Ren, Fremont, CA (US)
Joel D. Van Ess, Campbell, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,196,995

1. A method of control of a hybrid vehicle having an internal combustion engine and an auxiliary power source/sink, the method comprising:determining a torque profile for the internal combustion engine by;
determining a normalized torque profile for each stroke of a cylinder in the engine, wherein the normalized torque profile is based on intake manifold pressure;
scaling the normalized torque profile to determine the cylinder torque; and
summing the cylinder torques for all cylinders in the engine to obtain an overall engine torque profile;
determining whether the torque profile provides acceptable NVH;
when the torque profile is determined to provide acceptable NVH, operating the hybrid vehicle solely on the output of the internal combustion engine; and
when the torque profile is determined to provide unacceptable NVH, operating the hybrid vehicle on both the internal combustion engine and the auxiliary power source/sink, wherein the auxiliary power source/sink provides a smoothing torque to reduce NVH to an acceptable level.