Control system for internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorsSatoshi Yamaguchi, Mamoru Hasegawa, Hideki Sakamoto, Naoto Kitayama
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Abstract
A control system for an internal combustion engine having at least one fuel injection valve for injecting fuel into a combustion chamber of the engine and burning the injected fuel by compression ignition. A fuel injection control parameter for controlling at least one fuel injection valve is changed. A combustion state of the engine is then detected. A cetane number of the fuel is then estimated based on the changed fuel injection control parameter and the detected combustion state.
Claims14
A control system for an internal combustion engine having fuel injection means for injecting fuel into a combustion chamber of said engine and burning the injected fuel by compression ignition, said control system comprising:
- fuel injection control means for controlling said fuel injection means;
- combustion state detecting means for detecting a combustion state of said engine;
- and
- cetane number estimating means for changing a fuel injection control parameter set by said fuel injection control means and estimating a cetane number of the fuel based on said changed fuel injection control parameter and the combustion state detected by said combustion state detecting means.
A control method for an internal combustion engine having at least one fuel injection valve for injecting fuel into a combustion chamber of said engine and burning the injected fuel by compression ignition, said control method comprising the steps of:
- a) changing a fuel injection control parameter for controlling said at least one fuel injection valve;
- b) detecting a combustion state of said engine;
- and
- c) estimating a cetane number of the fuel based on said changed fuel injection control parameter and said detected combustion state.
Dependencies are inferred from the claim text.