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US 5,964,200 AGranted
Control apparatus and control method for lean burn engine and engine system
AssigneeHitachi, Ltd.
InventorsKousaku Shimada, Takeshi Atago
Life of this patent
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AssigneeHitachi, Ltd.
InventorsKousaku Shimada, Takeshi Atago
Estimating the term…
An electronic engine control system for a lean burn engine includes a unit for detecting an amount Qa of intake air fed into a cylinder of the engine, a unit for detecting an engine speed Ne, a unit for calculating a basic fuel injection pulse width TPbas on the basis of the intake air amount Qa and the engine speed Ne, and a unit for determining control parameters containing any of at least an air-fuel ratio, an ignition timing, a fuel injection timing, a throttle opening and an EGR rate in accordance with an operating state of the engine in optimum. A reference TPref having the same dimension as the basic fuel injection pulse width TPbas and which is a function of an accelerator operating amount determined on the basis of the accelerator operating amount is determined as a load parameter used upon determination of the control parameters of the engine in operation with a lean air-fuel ratio.
A lean burn engine control apparatus in an electronic engine control system for a lean burn engine including means for detecting an amount (Qa) of intake air fed into a cylinder of the engine, means for detecting an engine speed (Ne), means for calculating a basic fuel injection pulse width (TPbas) on the basis of said intake air amount (Qa) and said engine speed (Ne), and means for determining control parameters containing any of at least an air-fuel ratio, an ignition timing, a fuel injection timing, a throttle opening and an EGR rate in accordance with an operating state of the engine in optimum, said lean burn engine control apparatus comprising:
A lean burn engine control apparatus in an electronic engine control system for a lean burn engine including means for detecting an amount (Qa) of intake air fed into a cylinder of the engine, means for detecting an engine speed (Ne), means for calculating a basic fuel injection pulse width (TPbas) per cylinder by dividing said intake air amount (Qa) by said engine speed (Ne) and multiplying a quotient of said division by a coefficient so that an air-fuel ratio is equal to a stoichiometric air-fuel ratio, and means for retrieving a map for control parameters for selecting the control parameters containing any of at least the air-fuel ratio, an ignition timing, a fuel injection timing, a throttle opening and an EGR rate in optimum in accordance with an operating state of the engine with an axis for said engine speed and an axis for an engine load, said lean burn engine control apparatus comprising:
A lean burn engine control apparatus comprising:
Dependencies are inferred from the claim text.