Injector driving apparatus
First Claim
1. An injector driving apparatus comprising:
- a driving circuit for supplying a current individually to coils of multiple injectors mounted on an engine of a vehicle;
a common current flow path, in which a current flows to the coils in common;
a current detection element provided in the common current flow path for detecting the current flowing in the common current flow path as a current, that flows to the coils;
a current supply period guard part for measuring a period, during which the current continues to flow in the common current flow path, based on a detection result of the current detection element, and forcibly stopping the current supplied from the driving circuit to the coils when a measured period reaches a predetermined set period; and
a diagnosis part for checking whether the current supply period guard part normally stops the current supplied from the driving circuit to the coils,by supplying the current to each of the coils for a period shorter than a minimum period, which enables an injector to open a valve, andby sequentially switching over the coils thereby to continuously supply the current to the common current flow path,wherein the diagnosis part performs a checking operation in a period of no fuel injection into the engine.
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Accused Products
Abstract
In an injector driving apparatus, a driving circuit supplies a current individually to each coil of multiple injectors, a current detection element detects the current flowing in a common current flow path, which is common to the coils, a current supply period guard part forcibly stops the current supplied from the driving circuit to the coil upon determination that a measured period reached a predetermined set period based on a detection result of the current detection element, and a diagnosis part operates in a period of no fuel injection to check whether the current supply period guard part normally stops the current supplied to the coil, by continuously supplying the current to the coil for only a short period, which disables the injector to open a valve, and sequentially switches over the coils.
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Citations
7 Claims
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1. An injector driving apparatus comprising:
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a driving circuit for supplying a current individually to coils of multiple injectors mounted on an engine of a vehicle; a common current flow path, in which a current flows to the coils in common; a current detection element provided in the common current flow path for detecting the current flowing in the common current flow path as a current, that flows to the coils; a current supply period guard part for measuring a period, during which the current continues to flow in the common current flow path, based on a detection result of the current detection element, and forcibly stopping the current supplied from the driving circuit to the coils when a measured period reaches a predetermined set period; and a diagnosis part for checking whether the current supply period guard part normally stops the current supplied from the driving circuit to the coils, by supplying the current to each of the coils for a period shorter than a minimum period, which enables an injector to open a valve, and by sequentially switching over the coils thereby to continuously supply the current to the common current flow path, wherein the diagnosis part performs a checking operation in a period of no fuel injection into the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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- Resources
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Current AssigneeDENSO Corporation
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Original AssigneeDENSO Corporation
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InventorsFujita, Syohei
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Primary Examiner(s)Nguyen, Hung Q
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Assistant Examiner(s)Steckbauer, Kevin R
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Application NumberUS14/869,460Publication NumberTime in Patent Office588 DaysField of Search361166, 361167US Class CurrentCPC Class CodesF02D 2041/2058 using information of the ac...F02D 2041/224 Diagnosis of the fuel systemF02D 41/20 Output circuits, e.g. for c...F02D 41/221 relating to the failure of ...
