Failure diagnosis device for ignition circuit
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United States of America Patent
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Jul 21, 2020
Grant Date -
Mar 14, 2019
app pub date -
Feb 13, 2017
filing date -
Feb 29, 2016
priority date (Note) -
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Abstract
A failure diagnosis device for an ignition circuit, comprising: an ignition plug; an ignition coil; a capacitor series connection including a high side capacitor and a low side capacitor; a switching-element series connection including a high side switching element and a low side switching element; an inter-terminal voltage detection unit for detecting an inter-terminal voltage of the capacitor series connection; an intermediate voltage detection unit for detecting an intermediate voltage at the connection point of the high side capacitor and the low side capacitor; and a determination unit for determining a failure location of the ignition circuit based on at least one of the inter-terminal voltage and the intermediate voltage.
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