Turbo charged diesel-type piston engine and method for controlling such an engine
AssigneeVolvo Lastvagnar AB
InventorsUlrich Gobert, Daniel Grunditz, Sebastian Krausche
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Abstract
A piston engine and a method for controlling a diesel-type piston engine including at least one combustion chamber formed by a cylinder, a movably arranged piston in each cylinder, which piston is connected to a crankshaft, an injection device designed to inject fuel directly into the combustion chamber and turbo system comprising a low pressure turbo and a high pressure turbo. The thermal efficiency of the internal combustion is increased while requirements relating to nitrogen oxide and soot particle emissions continue to be maintained.
Claims43
A method for controlling a diesel-type piston engine comprising at least one combustion chamber formed by a cylinder (52) and a movably arranged piston (53) in each cylinder that is connected to a crankshaft (54), an injection device (56) configured to inject fuel directly into the combustion chamber, and a turbo system comprising a low-pressure turbo (22) and a high-pressure turbo (18) disposed downstream of the low-pressure turbo (22), the low-pressure turbo (22) and high-pressure turbo (18) each having a turbo map efficiency greater than 60%, the method comprising utilizing a control mechanism for gas exchange valves (57, 58) to establish at least a first operating range for the internal combustion engine at a mean piston velocity greater than 6 m/s and at an engine load greater than 15 bar BMEP at which the volumetric efficiency within said first operating range is less than 70%.
A diesel-type piston engine comprising at least one combustion chamber formed by a cylinder (52) and a movably arranged piston (53) in each cylinder that is connected to a crankshaft (54), an injection device (56) configured to inject fuel directly into said combustion chamber, and a turbo system comprising a low-pressure turbo (22) and a high-pressure turbo (18) which is disposed downstream of said low-pressure turbo (22), said low-pressure turbo (22) and high-pressure turbo (18) each have a turbo map efficiency greater than 60%, and further comprising a control mechanism of gas exchange valves (57, 58) that is configured to provide at least a first operating range for the internal combustion engine at a mean piston velocity greater than 6 m/s and at an engine load greater than 15 bar BMEP, in which the volumetric efficiency within said first operating range is less than 70%.
Dependencies are inferred from the claim text.