Diagnostic device
AssigneeDenso Corporation
InventorsMasanori Kurosawa, Kosuke Nakano
Life of this patent
Estimating the term…
Abstract
An ECU functioning as a diagnostic device includes an information acquisition portion acquiring a flow rate of a fluid flowing through an intake pipe, and a diagnostic portion performing a diagnosis on a second purge pipe employed as a fuel gas pipe regarding a connection failure. The diagnostic portion diagnoses a connection failure of the fuel gas pipe according to magnitude of a pulsation of the flow rate acquired by the information acquisition portion.
Claims8
A diagnostic device diagnosing a fuel gas pipe connected to an intake pipe of an engine, comprising:
- a flow rate acquisition portion acquiring a flow rate of a fluid flowing through the intake pipe;
- and
- a diagnostic portion performing a diagnosis on the fuel gas pipe regarding a connection failure,
- wherein the diagnostic portion performs the diagnosis according to a magnitude of a pulsation of the flow rate acquired by the flow rate acquisition portion,
- wherein the diagnostic portion diagnoses a connection failure of the fuel gas pipe when the magnitude of the pulsation becomes smaller,
- wherein the diagnostic device further comprises a pulsation threshold setting portion setting a pulsation threshold, and
- wherein the diagnostic portion calculates a pulsation rate according to a ratio of magnitude of the pulsation with respect to an average of the flow rate acquired by the flow rate acquisition portion and diagnoses a connection failure of the fuel gas pipe when the pulsation rate decreases below the pulsation threshold.
A diagnostic device diagnosing a fuel gas pipe connected to an intake pipe of an engine, comprising:
- a flow rate acquisition portion acquiring a flow rate of a fluid flowing through the intake pipe;
- and
- a diagnostic portion performing a diagnosis on the fuel gas pipe regarding a connection failure,
- wherein the diagnostic portion performs the diagnosis according to a magnitude of a pulsation of the flow rate acquired by the flow rate acquisition portion;
- and
- wherein the diagnostic portion does not perform the diagnosis when a supercharger fitted to the intake pipe is driven.
A diagnostic device diagnosing a fuel gas pipe connected to an intake pipe of an engine, comprising:
- a flow rate acquisition portion acquiring a flow rate of a fluid flowing through the intake pipe;
- and
- a diagnostic portion performing a diagnosis on the fuel gas pipe regarding a connection failure,
- wherein the diagnostic portion performs the diagnosis according to a magnitude of a pulsation of the flow rate acquired by the flow rate acquisition portion;
- wherein the engine includes at least four cylinders;
- and
- wherein the diagnostic portion performs the diagnosis only when the engine is running by suspending fuel combustion in at least one cylinder.
Dependencies are inferred from the claim text.