Systems and methods for diagnosing a vehicle engine intake manifold and exhaust system
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for pinpointing a source of degradation in a vehicle engine system. In one example, a method includes spinning an engine of a vehicle unfueled in a forward and a reverse direction, in no particular order, and recording a first intake air flow and a second intake air flow, respectively, in an intake of the engine, and where the source of degradation is indicated as a function of both the first air flow and the second air flow. In this way, the degradation of the vehicle engine system may be pinpointed as to being located in the intake manifold, the exhaust system, or the engine.
Claims11
A system for a vehicle, comprising:
- an engine system including an intake manifold, an exhaust system, and an engine;
- a mass air flow sensor positioned in the intake manifold;
- a motor, capable of rotating the engine unfueled;
- and
- a controller, storing instructions in non-transitory memory that, when executed, cause the controller to:
- obtain a first baseline intake air flow via the mass air flow sensor by rotating the engine unfueled via the motor in a forward direction and obtain a second baseline intake air flow via the mass air flow sensor by rotating the engine unfueled via the motor in a reverse direction, just subsequent to rotating the engine unfueled in the forward direction to obtain the first baseline intake air flow;
- and
- responsive to conditions being indicated to be met for conducting an engine system diagnostic to indicate a presence or absence of degradation stemming from the intake manifold, the engine, or the exhaust system, obtain a first intake air flow via the mass air flow sensor by rotating the engine unfueled via the motor in the forward direction and obtain a second intake air flow via the mass air flow sensor by rotating the engine unfueled via the motor in the reverse direction just subsequent to rotating the engine unfueled in the forward direction to obtain the first intake air flow, and where indicating the presence or absence of degradation involves comparing the first intake air flow to the first baseline intake air flow to yield a first result, comparing the second intake air flow to the second baseline intake air flow to yield a second result, and then comparing the first result to the second result to pinpoint whether degradation is present in the intake manifold, the engine, or the exhaust system.
A system for a vehicle, comprising:
- an engine including an intake system and an exhaust system;
- a mass air flow sensor;
- an electric machine;
- and
- a controller, storing instructions in non-transitory memory that, when executed, cause the controller to:
- indicate a presence or absence of degradation of the intake system or the exhaust system in response to air flows generated via rotating the engine in a first direction and a second direction.
Dependencies are inferred from the claim text.