Control methods for improved catalytic converter efficiency and diagnosis
First Claim
Patent Images
1. A method of synchronizing individual engine cylinder fuel changes to their respective changes in exhaust gases, including the steps of:
- correlating controlled fuel changes between individual injectors with an electronic control unit and subsequently detecting with a sensor and determining with the electronic control unit an exhaust A/F ratio changes greater than normal A/F ratio variations; and
determining and storing in memory a time delay determined from a time difference between causing the fuel change and the detected exhaust A/F ratio changes.
0 Assignments
0 Petitions
Accused Products
Abstract
A controlling method for adjusting concentrations of, for example, individual cylinder'"'"'s exhaust gas constituents to provide engine functions such as catalytic converter diagnosis, increased overall catalytic converter efficiency and rapid catalyst heating, before and/or after initiating closed loop fuel injection control, using a selected temperature sensor location within a low thermal mass catalytic converter design.
-
Citations
20 Claims
-
1. A method of synchronizing individual engine cylinder fuel changes to their respective changes in exhaust gases, including the steps of:
-
correlating controlled fuel changes between individual injectors with an electronic control unit and subsequently detecting with a sensor and determining with the electronic control unit an exhaust A/F ratio changes greater than normal A/F ratio variations; and determining and storing in memory a time delay determined from a time difference between causing the fuel change and the detected exhaust A/F ratio changes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of individual cylinder fuel control compensating for transient engine load changes, including the steps of:
-
providing an internal combustion engine, an exhaust system, and an engine control system, the engine control system including an engine control unit, an oxygen sensor, and a one or more fuel injector(s), for completing and including the steps of; monitoring engine exhaust gases with the oxygen sensor; detecting conditions with the engine control unit indicating a load change and enabling individual cylinder fuel control; enabling a change in fuel quantity to at least one selected individual cylinder with the one or more fuel injector(s), to produce a change in exhaust gases'"'"' A/F conditions that adjusts for effects of the load change; detecting exhaust gases'"'"' conditions resulting from each individual cylinders'"'"' said change in fuel quantity by sampling at predetermined times; and controlling subsequent changes in cylinder'"'"'s fuel quantity with the engine control unit and one or more fuel injector(s), such changes depending on effects that each previous said change in fuel quantities has on subsequent exhaust gases'"'"' A/F conditions detected for each individual cylinders'"'"' combustion event, for cycling of gases'"'"' A/F about a defined control point and compensate exhaust gases'"'"' A/F conditions for said load changes. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A method of early cycling an oxygen sensor'"'"'s output, during non-stoichiometric transient engine load change conditions, including the steps of:
providing an internal combustion engine, an exhaust system, and an engine control system, the engine control system including an engine control unit, an oxygen sensor, and a one or more fuel injector(s), for completing and including the steps of; causing estimated fuel changes into selected individual cylinders with the one or more fuel injector(s) by the engine control unit; and modifying subsequently said estimated fuel changes into selected individual cylinders with the one or more fuel injector(s) by the engine control unit using a successive approximation approach based upon feedback determined by sampling the oxygen sensor'"'"'s output during predetermined time periods. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
Specification