US Patent No. 10,088,388

ENGINE ERROR DETECTION SYSTEM


Patent No. 10,088,388
Issue Date October 02, 2018
Title Engine Error Detection System
Inventorship Shikui Kevin Chen, San Jose, CA (US)
Masaki Nagashima, Pacific Grove, CA (US)
Li-Chun Chien, Milpitas, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,088,388

1. A method for detecting misfire in an engine, the engine having a plurality of working chambers and being operated in a skip fire manner, the method comprising:assigning a window to a target firing opportunity;
attempting to fire a target working chamber during the target firing opportunity;
measuring a change in an engine parameter during the target firing opportunity;
using a multi-cylinder pressure model to help determine an expected change in the engine parameter during the target firing opportunity wherein the pressure model involves estimating pressure in a skipped working chamber, wherein the determination of the expected change in the engine parameter accounts for torque added or subtracted from the powertrain by an auxiliary power source;
based on a comparison between the expected change and the measured change, determining whether the target working chamber misfired.