Internal combustion engine with turbocharge arrangement
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A technology of internal combustion engine and turbine, applied in the field of vehicles
Active Publication Date: 2020-07-24
OLSHAMMAR NEBULA AB
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[0101] Figures 10a-10b schematically illustrate the exhaust flow from a 4-stroke engine with 2 cylinders and 1 exhaust cylinder. No fuel is burned in the exhaust cylinder and the cylinder is fully open towards the exhaust manifold and has no valves. The task of the exhaust cylinder is, first to receive part of the exhaust gas from one of the combustion cylinders (other part of the exhaust gas goes directly to the exhaust manifold / pipe), then wait for half a revolution of the engine, and the containment of the exhaust gas by the exhaust piston A portion is sent to the exhaust pipe and turbocharger, which then receives a portion of the exhaust gas from another burning cylinder, and repeats. This makes the exhaust manifold resonate at all revs.
[0102] A 4-stroke engine with 2 cylinders and 1 exhaust cylinder provides positive torque when the exhaust piston (away from the exhaust chamber) is depressed, which makes the torque curve change less compared to a conventional 2-cylind...
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Abstract
The invention concerns an internal combustion engine comprising a combustion cylinder provided with a piston (5, 6, 104, 105, 106, 205, 206, 207, 208) and a combustion chamber (2, 3, 101, 102, 103, 201, 202, 203, 204); an inlet valve (7, 9, 113, 215); an exhaust valve (8, 10, 112, 216); an exhaust duct (17) and a turbocharge arrangement (26, 27). The engine further comprises an exhaust cylinder provided with an exhaust piston (4) and an exhaust chamber (1), wherein the exhaust chamber (1) is arranged in fluid communication with the combustion chamber (2, 3, 101, 102, 103, 201, 202, 203, 204) via a channel or opening (14, 15, 109, 110, 111, 211, 212, 213, 214) that can be closed by the exhaust valve (8, 10, 112, 216), and wherein the exhaust chamber (1) is arranged in open fluid communication with the exhaust duct (17) so that exhaust gas exiting the combustion chamber (2, 3, 101, 102, 103, 201, 202, 203, 204) when the exhaust valve (8, 10, 112, 216) is open is allowed to distribute between the exhaust chamber (1) and the exhaust duct (17).
Description
technical field [0001] The invention relates to an internal combustion engine provided with a turbocharging arrangement according to the preamble of claim 1 . The invention also relates to a method for operating such an engine and a vehicle provided with such an engine for propelling the vehicle. Background technique [0002] Exhaust gases from an internal combustion engine contain energy that can be used in a turbocharger, where the exhaust gases drive a turbine connected to a compressor that compresses the intake air supplied to the engine. [0003] If the volume of air drawn in at normal air pressure is as large as the stroke volume, the volumetric efficiency (VE) of the combustion cylinder is 100%. Naturally aspirated engines are able to achieve 100% VE when the intake and exhaust manifolds resonate. Turbocharged engines can achieve VE>100%. [0004] Typically, small turbochargers are effective when the engine speed (revolutions per minute) is low, ie when the engi...
Claims
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Application Information
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