Online monitoring and diagnostics in vehicle powertrains
AssigneeGarrett Transportation I Inc.
InventorsTomas Poloni, Jaroslav Pekar, Paul Dickinson
Life of this patent
Estimating the term…
Abstract
Methods and systems for calculating a plurality of aging factors in a system operating an engine. The calculated aging factors may include one or more of fuel injector drift, exhaust gas recirculation valve obstruction, and mass air flow sensor bias. Mass flow throughout the system, and pressures and temperatures within the system, are observed in an approach that relies on mass preservation concepts to estimate fuel injector drift, exhaust gas recirculation valve obstruction, and mass air flow sensor bias.
Claims11
A method of operating a system including an engine with an intake manifold, an exhaust manifold, and at least one fuel injector having an output subject to drift, the system also including a mas air flow (MAF) measurement device subject to bias and a fuel-air mix (FAM) measurement device;
- the method comprising:
- calculating a mass flow into the intake manifold, using an output of the MAF device;
- observing a ratio of fuel to air exiting the exhaust manifold using the FAM measurement device;
- determining an expected quantity of fuel from the fuel injector;
- determining an intake manifold pressure in the intake manifold;
- using the ratio of fuel to air exiting the exhaust manifold and the intake manifold pressure, estimating the drift of the fuel injector;
- and
- using the ratio of fuel to air exiting the exhaust manifold and the intake manifold pressure, estimating the bias of the MAF device.
A system including an engine with an intake manifold, an exhaust manifold, and at least one fuel injector having an output subject to drift, the system also including a mas air flow (MAF) measurement device subject to bias and a fuel-air mix (FAM) measurement device, and a controller configured to perform a method comprising:
- calculating a mass flow into the intake manifold, using an output of the MAF device;
- observing a ratio of fuel to air exiting the exhaust manifold using the FAM measurement device;
- determining an expected quantity of fuel from the fuel injector;
- determining an intake manifold pressure in the intake manifold;
- using the ratio of fuel to air exiting the exhaust manifold and the intake manifold pressure, estimating the drift of the fuel injector;
- and
- using the ratio of fuel to air exiting the exhaust manifold and the intake manifold pressure, estimating the bias of the MAF device.
Dependencies are inferred from the claim text.