US 2016/0237940 A1Published application

Detection of reversion based on mass air flow sensor readings

AssigneeGM Global Technology Operations LLC

InventorsYiran Hu, Shifang Li, Chen-Fang Chang

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Abstract

An engine system includes a mass air flow sensor and a manifold absolute pressure sensor configured to provide a real-time MAP signal during an event. The mass air flow sensor is configured to generate a set of mass air flow readings based on an airflow through the mass air flow sensor during the event. The set of mass air flow readings have a maximum value and a minimum value. A controller is configured to execute a method for detecting reversion in the air flow. If the rate of change in the real-time MAP signal is less than the predetermined transient threshold value (T0), the method includes setting a delta factor (D) as the difference between the maximum value and the minimum value. Reversion is detected based at least partially on a magnitude of the delta factor (D).

Claims19

Dependent claims

An engine system comprising:

a manifold absolute pressure sensor configured to provide a real-time MAP signal during an event;
a mass air flow sensor configured to generate a set of mass air flow readings based on an airflow through the mass air flow sensor during the event, the set of mass air flow readings having a maximum value and a minimum value;
and
a controller operatively connected to the mass air flow sensor and the manifold absolute pressure sensor and having a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for detecting reversion in the airflow;
wherein execution of the instructions by the processor causes the controller to:
determine whether a rate of change in the real-time MAP signal is greater than or equal to a predetermined transient threshold value (T0);
if the change in the real-time MAP signal is less than the predetermined transient threshold value (T0), set a delta factor (D) as the difference between the maximum value and the minimum value of the set of mass air flow readings;
and
detect the reversion based at least partially on a magnitude of the delta factor (D).

6 more elements

A method of detecting reversion in an engine system having a manifold absolute pressure sensor configured to provide a real-time MAP signal during an event and a mass air flow sensor, the method comprising:

determining whether a rate of change in the real-time MAP signal is greater than or equal to a predetermined transient threshold value (T0);
wherein the mass air flow sensor is configured to generate a set of mass air flow readings based on an airflow through the mass air flow sensor during the event, the set of mass air flow readings having a maximum value and a minimum value;
if the rate of change in the real-time MAP signal is less than the predetermined transient threshold value (T0), setting a delta factor (D) as the difference between the maximum value and the minimum value;
and
detecting the reversion based at least partially on a magnitude of the delta factor (D).

2 more elements

Dependencies are inferred from the claim text.