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US 11,242,810 B2Granted
Method and device for increased exhaust gas temperature in a diesel engine
AssigneeHedman Ericsson Patent AB
InventorMats Hedman
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AssigneeHedman Ericsson Patent AB
InventorMats Hedman
Estimating the term…
The present invention relates to a method for increased exhaust gas temperature and emission reduction at partial loads in a diesel engine, wherein said engine comprises a cylinder with a reciprocating piston, a variable compression volume (VCR), and at least one exhaust valve and at least one inlet valve, the latter being equipped with variable valve timing (WT). According to the prevailing engine power requirement, an engine control system determines when to open and close said inlet valve, and the size of said compression volume in order to achieve a sufficiently elevated exhaust gas temperature so that correct exhaust gas purification can be achieved. The method is characterized in that the cylinder pressure during the expansion stroke is managed by the engine control system by means of the VCR and VVT functions, such that said pressure reaches atmospheric or sub atmospheric levels at or before bottom dead centre, at engine loads at or below 25% of the maximum engine load, whereby the inlet valve is opened to allow air to mix with the combustion gases. The invention also relates to a corresponding device and a diesel engine comprising said device.
A method for providing increased exhaust temperature and lowered emissions at engine part loads amounting to 25% or less of a maximum engine load in a diesel engine, said diesel engine comprising at least one cylinder with a reciprocating piston, a variable compression volume, VCR, at least one exhaust valve and at least one intake valve, the intake valve being provided with variable valve timing, VVT, wherein the method comprises:
A device for providing increased exhaust temperature and lowered emissions at engine part loads in a diesel engine, said diesel engine comprising at least one cylinder with a reciprocating piston allowing variable compression volume, VCR, at least one exhaust valve, and at least one intake valve, the intake valve being provided with variable valve timing, VVT, wherein the device comprises:
An apparatus comprising:
Dependencies are inferred from the claim text.