Light-weight compact diesel engine
AssigneeAdvanced Engine Technology Ltd.
InventorsGary Webster, Dennis Raymond
Life of this patent
Estimating the term…
Abstract
Disclosed is a diesel engine comprising a cylinder head; a combustion chamber within the cylinder head, the combustion chamber being in the shape of a bowl; and a piston having a piston crown, the piston crown having a dome-shape for protruding within the cylinder head during a combustion operation near or at top dead center. The engine is preferably a two stroke crankcase compression engine. Use of a combustion chamber in the shape of a shallow bowl along with other parameter selection decreases the rates of combustion pressure rise while providing reasonable power output.
Claims14
A small diesel engine comprising:
- a small cylinder having a cylinder head defining a combustion chamber therein, the combustion chamber being in the shape of a broadened shallow bowl;
- a piston reciprocally mounted within said cylinder, the piston having a piston crown in the shape of a dome for protruding within the bowl-shaped combustion chamber during a combustion event before and after top dead center, piston protruding so as to enter the combustion chamber and provide a variable geometry combustion chamber when the piston is moving down after the top of its stroke;
- a fuel injector for injecting fuel spray plumes into said combustion chamber to facilitate the combustion process during the downward stroke of the piston;
- and
- a glow plug in the cylinder head and protruding into the bowl-shaped chamber in close proximity to an injected fuel spray plume but not in direct contact with the injected fuel to thereby facilitate fuel ignition at moderate compression ratios during engine starting, thereby facilitating use of a small cylinder displacement;
- wherein a minimal squish area is defined between the bowl-shaped chamber and edges of the piston as the piston approaches top dead center.
A generator set, comprising:
- a diesel engine comprising:
- a cylinder having a cylinder head defining a combustion chamber therein, the combustion chamber being in the shape of a broadened shallow bowl;
- a piston reciprocally mounted within said cylinder, the piston having a piston crown in the shape of a dome for protruding within the bowl-shaped combustion chamber during a combustion event before and after top dead center, piston protruding so as to enter the combustion chamber and provide a variable geometry combustion chamber when the piston is moving down after the top of its stroke;
- a fuel injector for injecting fuel spray plumes into said combustion chamber to facilitate the combustion process during the downward stroke of the piston;
- and
- a glow plug in the cylinder head and protruding into the bowl-shaped chamber in close proximity to the injected fuel spray plume but not in direct contact with the injected fuel to thereby facilitate fuel ignition at moderate compression ratios during engine starting, thereby facilitating use of a small cylinder;
- wherein a minimal squish area is defined between the bowl-shaped chamber and edges of the piston as the piston approaches top dead center;
- and
- a fuel reservoir system comprising:
- a fuel reservoir for containing fuel;
- a fuel reservoir having an orifice therein for keeping the fuel contained in the fuel reservoir level;
- a pulse type fuel pump for pumping fuel from a fuel source to a second engine mounted fuel reservoir for use by the generator;
- and
- a fuel line under low pressure from the engine mounted fuel reservoir flowing through a fuel flow restrictor before feeding the high pressure injection pump located a few inches further downstream.
Dependencies are inferred from the claim text.