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US 11,230,982 B2Granted
Method for operating an internal combustion piston engine
AssigneeVolvo Truck Corporation
InventorStaffan Lundgren
Life of this patent
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AssigneeVolvo Truck Corporation
InventorStaffan Lundgren
Estimating the term…
A method is provided for operating an internal combustion piston engine, including introducing air into a cylinder of the engine, compressing the air in a first compression stroke of the cylinder, providing fuel into the cylinder for a first combustion, with a portion of the oxygen in the compressed air as oxidant, in a first power stroke succeeding the first compression stroke, to produce residues including oxygen, compressing the residues in a second compression stroke succeeding the first power stroke, and providing, after the first combustion, fuel into the cylinder for a second combustion, with at least a portion of the oxygen of the residues as oxidant, in a second power stroke succeeding the second compression stroke, wherein the first compression stroke is repealed immediately after the second power stroke, and the introduction of air into the cylinder is done at the end of the second power stroke and/or at the beginning of the first compression stroke.
A method for operating an internal combustion piston engine, comprising introducing air into a cylinder of the engine, compressing the air in a first compression stroke of the cylinder, providing fuel into the cylinder for a first combustion, with a portion of the oxygen in the compressed air as oxidant, in a first power stroke succeeding the first compression stroke, to produce residues including oxygen, compressing the residues in a second compression stroke succeeding the first power stroke, and providing, after the first combustion, fuel into the cylinder for a second combustion, with at least a portion of the oxygen of the residues as oxidant, in a second power stroke succeeding the second compression stroke, wherein the first combustion is a diffusion combustion provided by a compression ignition, wherein the first compression stroke is repeated immediately after the second power stroke, and the introduction of air into the cylinder is done at the end of the second power stroke and/or at the beginning of the first compression stroke, the method comprising controlling the amount of fuel provided for the second combustion so as for the second combustion to be a stoichiometric combustion, wherein the method comprises preventing the introduction of air into the cylinder between the first and second combustions, and wherein the engine is a crankcase-scavenged engine wherein an intake guide is arranged to guide air to the cylinder from a crankcase of the engine, wherein an air conduit is arranged to guide air to the crankcase, wherein preventing the introduction of air into the cylinder bet the first and second combustions comprises controlling flow control means for the air conduit to allow air to escape the crankcase during the first power stroke.
A method for operating an internal combustion piston engine, comprising introducing air into a cylinder of the engine, compressing the air in a first compression stroke of the cylinder, providing fuel into the cylinder for a first combustion, with a portion of the oxygen in the compressed air as oxidant, in a first power stroke succeeding the first compression stroke, to produce residues including oxygen, compressing the residues in a second compression stroke succeeding the first power stroke, and providing, after the first combustion, fuel into the cylinder for a second combustion, wherein the fuel provided for the first combustion is diesel fuel and the fuel provided for the second combustion is a second fuel of a type which is different from that of the first fuel, with at least a portion of the oxygen of the residues as oxidant, in a second power stroke succeeding the second compression stroke, wherein the first combustion is a diffusion combustion provided by a compression ignition, wherein the first compression stroke is repeated immediately after the second power stroke, and the introduction of air into the cylinder is done at the end of the second power stroke and/or at the beginning of the first compression stroke, the method comprising controlling the amount of fuel provided for the second combustion so as for the second combustion to be a stoichiometric combustion, wherein the method comprises supplying the diesel fuel for the injection thereof from a container, and reforming diesel fuel from the container to produce the second fuel in the form of gasoline.
A method for operating an internal combustion piston engine, comprising introducing air into a cylinder of the engine, compressing the air in a first compression stroke of the cylinder, providing fuel into the cylinder for a first combustion, with a portion of the oxygen in the compressed air as oxidant, in a first power stroke succeeding the first compression stroke, to produce residues including oxygen, compressing the residues in a second compression stroke succeeding the first power stroke, and providing, after the first combustion, fuel into the cylinder for a second combustion, with at least a portion of the oxygen of the residues as oxidant, in a second power stroke succeeding the second compression stroke, wherein the first combustion is a diffusion combustion provided by a compression ignition, wherein the first compression stroke is repeated immediately after the second power stroke, and the introduction of air into the cylinder is done at the end of the second power stroke and/or at the beginning of the first compression stroke, the method comprising controlling the amount of fuel provided for the second combustion so as for the second combustion to be a stoichiometric combustion, where the engine comprises an exhaust guide arranged to guide gases from the cylinder to an exhaust treatment device, the fuel provided for the first combustion being a first fuel and the fuel provided for the second combustion being a second fuel, the method comprising determining a requested load of the engine, determining a temperature of the exhaust treatment device, and determining based on the determined temperature whether to operate the engine at the requested load in a first mode or a second mode, the amount of first fuel provided for the first combustion being smaller in the second mode than in the first mode, and/or the amount of second fuel provided for the second combustion being larger in the second mode than in the first mode.
Dependencies are inferred from the claim text.