Engine controller for starting and stopping engine
AssigneeDenso Corporation
InventorsNobuyuki Satake, Seiichirou Nishikawa, Yoshifumi Murakami
Life of this patent
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Abstract
During a shut-down period of an engine based on an idle stop control, a computer estimates a power stroke cylinder and a compression stroke cylinder when the engine is stopped. A fuel is injected into the power stroke cylinder and the compression stroke cylinder in an intake stroke just before the engine is stopped. An air-fuel mixture is hold in each cylinder with the engine stopped. When an auto start is required while the engine is stopped, a spark ignition is performed in the power stroke cylinder to start cranking of the engine by combustion energy. At nest ignition timing, a spark ignition is performed in the compression stroke cylinder to start the engine without an aid of a starter.
Claims6
An engine controller controlling start and stop of an engine that has an intake port to which a fuel is injected, the engine controller comprising:
- a stroke estimating means for estimating, during a shut-down period of the engine, a stroke of each cylinder when the engine is stopped, the stroke estimating means storing an estimated result;
- a fuel injection control means for injecting a fuel, which is required to start the engine in a next starting time, into the cylinder which is estimated to be stopped in a power stroke or in a compression stroke based on the estimated result;
- and
- a starter-motorless-start control means for igniting and combusting an air-fuel mixture in the cylinder that is estimated to be stopped in the power stroke so as to begin a cranking by a combusting energy of the air-fuel mixture, the starter-motorless-start control means igniting, at a next ignition timing, an air-fuel mixture in the cylinder that is estimated to be stopped in compression stroke in order to start the engine without an aid of a starter.
Dependencies are inferred from the claim text.