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US 10,544,748 B2Granted
Systems and methods for wastegate diagnostics
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for diagnostics of a wastegate valve during vehicle-off conditions. In one example, the engine may be reverse rotated, unfueled, and air flow via the intake manifold may be estimated and compared to a baseline air flow. A stuck open wastegate valve may be indicated based on the comparison between the intake air flow and the baseline air flow.
Claims18
A method, comprising:
- testing for degradation of a wastegate valve, positioned in a wastegate passage which is coupled in parallel to a turbine positioned in an exhaust system of an engine, by routing airflow from the exhaust system through the wastegate valve into an intake of the engine and comparing the airflow in the intake to a baseline airflow through the wastegate valve into the engine intake, wherein the routing of airflow from the exhaust system through the wastegate is by one or more of reverse rotation of the engine and reverse rotation of an electric booster coupled to the engine intake.
An engine method, comprising:
- during a first engine condition, reverse rotating an engine or reverse rotation of an electric booster coupled to an engine intake to route ambient air through one or more of an exhaust turbine positioned in an exhaust of the engine and a wastegate valve positioned in a wastegate passage bypassing the exhaust turbine, and recording a baseline intake airflow;
- during a second engine condition, reverse rotating the engine or reverse rotation of an electric booster coupled to the engine intake to route ambient air through one or more of the exhaust turbine and the wastegate valve, and recording an updated intake airflow;
- and
- indicating that the wastegate valve is stuck in an open position in response to the updated intake airflow being higher than the baseline intake airflow.
1 more element
A system, comprising:
- a vehicle, including an autonomous vehicle and/or a hybrid vehicle;
- an electric machine;
- an engine including an intake passage and an exhaust passage;
- an intake throttle coupled to the intake passage;
- a turbocharger including an intake compressor coupled to the intake passage and an exhaust turbine coupled to the exhaust passage;
- a wastegate passage coupled to the exhaust passage across the exhaust turbine, a wastegate valve coupled to the wastegate passage;
- a manifold air flow (MAF) sensor coupled to the intake passage;
- a conduit coupled to the intake passage downstream of the intake compressor and upstream of a charge air cooler, the conduit including a motor-driven electric booster;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- obtaining a baseline airflow via the MAF sensor by reverse rotating the engine with the electric machine when the wastegate valve is first installed;
- and
- after usage of the wastegate valve for a threshold duration since the wastegate valve is installed and while the engine is rotated in reverse by the electric machine, obtaining a first intake air flow via the MAF sensor;
- and
- responsive to the first intake air flow being higher than the baseline airflow, indicating degradation of the wastegate valve.
12 more elements
Dependencies are inferred from the claim text.