CNG direct-injection into IC engine
OwnerKlaus Seifert, Thomas Schickinventors
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Abstract
The invention relates to a method for operating a four-stroke internal combustion engine with natural gas. In this method, at high to full torque operating conditions, the natural gas is injected directly into the cylinder of the engine toward the end of the induction stroke or at the start of the compression stroke. This may take place in particular in a crank angle range between 210° and 90° before top dead center. The efficiency of the engine is thus improved without generating a gas pressure higher than the storage pressure. It is preferable for the engine to be operated with a stoichiometric air/fuel ratio.
Claims12
A method for operating an internal combustion engine with natural gas, comprising:
- injecting natural gas into the combustion chamber (12) under pressure, said injection occurring near the end of the induction stroke or near the start of the compression stroke.
An internal combustion engine, comprising:
- at least one combustion chamber (12), at least one cylinder (2) with a piston (1) reciprocating within said cylinder, an air intake (3), an intake valve (5), an exhaust (10), an exhaust valve (11) and an injector (8) for injecting compressed natural gas, and
- an electronic control unit (9) electronically coupled to said intake valve, said exhaust valve, and said injector wherein said electronic control unit causes said injector to inject said compressed natural gas between 210° and 90° before top dead center of said piston.
Dependencies are inferred from the claim text.