Control Device for Internal Combustion Engine
AssigneeHitachi Astemo, Ltd.
InventorsRyutaro KOIWAI, Osamu MUKAIHARA
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Abstract
A processor (CPU 40e) of a control device (ECU 0) for an internal combustion engine identifies a first throttle valve opening degree θA and a second throttle valve opening degree θB at which a change rate (differential value) of an index (a deposit thickness, a decrease rate of an effective opening area, a flow rate decrease rate, and the like) correlated with a decrease rate of an effective opening area of a throttle valve changes (s109). The processor (CPU 40e) estimates an index at any throttle valve opening degree from the first throttle valve opening degree θA and the second throttle valve opening degree θB (s110), and calculates an effective opening area of the throttle valve from the estimated index (s112).
Claims13
A control device for an internal combustion engine comprising a processor configured to:
- identify first and second throttle valve opening degrees at which a change rate of an index correlated with a decrease rate of an effective opening area of a throttle valve changes;
- estimate the index at an arbitrary throttle valve opening degree from the first and second throttle valve opening degrees;
- and
- calculate an effective opening area of a throttle valve from the estimated index.
Dependencies are inferred from the claim text.