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US 11,143,575 B2Granted
Diagnostic system and method for detecting internal combustion engine faults using exhaust pressure readings
AssigneesTula Technology, Inc., Cummins Inc.
InventorShikui Kevin Chen
Life of this patent
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Abstract
A diagnostic system and method that (a) that uses models indicative of both successful firing and skips to determine if cylinders of a skip fire controlled internal combustion engine have successfully fired or successfully skipped and (b) uses filtered exhaust gas pressure readings for detecting faults associated with EGR systems and/or turbocharger systems.
Claims37
A method comprising:
- generating first and second models of exhaust pressures for a cylinder of an internal combustion engine that is (a) successfully fired and (b) successfully skipped respectively;
- issuing a command to either fire or skip the cylinder during a working cycle of the internal combustion engine;
- and
- determining if the cylinder successfully fired or skipped by comparing a measured exhaust pressure with:
- the first model if the command was to fire the cylinder during the working cycle;
- and
- the second model if the command was to skip the cylinder during the working cycle.
4 more elements
A system, comprising:
- an internal combustion engine having a plurality of cylinders;
- a skip fire engine controller arranged to operate the cylinders of the internal combustion engine in a skip fire manner, the skip fire operation involving firing the cylinders during some working cycles and skipping the cylinders during other working cycles;
- a storage unit arranged to store:
- a first model of exhaust pressures indicative of successful firings of the cylinders of the internal combustion engine;
- and
- a second model of exhaust pressures indicative of successful skips of the cylinders of the internal combustion engine;
- and
- a fault detection system arranged to generate fault signals for working cycles of the cylinders that were either unsuccessfully fired or unsuccessfully skipped by comparing a measured exhaust pressure with (a) the first model for fire commands and (b) the second model for skip commands.
5 more elements
A system, comprising:
- an internal combustion engine having a plurality of cylinders;
- a skip fire engine controller arranged to operate the cylinders of the internal combustion engine in a skip fire manner, the skip fire operation involving firing the cylinders during some working cycles and skipping the cylinders during other working cycles;
- and
- a fault detection system arranged to:
- (a) filter a measured exhaust pressure signal over multiple working cycles of the plurality of cylinders;
- and
- (b) generate a diagnostic fault signal if the filtered measured exhaust pressure signal falls below a threshold pressure.
4 more elements
Dependencies are inferred from the claim text.