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Piston-type internal combustion engine

A technology of internal combustion engine and piston type, applied in the direction of internal combustion piston engine, combustion engine, mechanical equipment, etc., can solve the problems of high exhaust temperature, increased engine load, harmful exhaust system, etc.

Inactive Publication Date: 2008-11-12
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach results in a certain increase in engine load in the form of soot and engine lube oil contamination, or dilution of lube oil with fuel, and high exhaust temperatures, which are harmful to exhaust systems are harmful
In addition, this approach creates certain problems for the effective operation of the LNA system at low loads and part loads, since LNA systems generally function best when the exhaust gas temperature exceeds about 300°C, which Usually means that the engine is running at high or medium load at this time

Method used

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Examples

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Embodiment Construction

[0011] The internal combustion engine 10 comprises an engine block 11 having six piston cylinders 12 and an intake manifold 13 and an exhaust manifold 14 . Exhaust gases from the engine are fed via an exhaust pipe 15 to a turbine rotor 17 of a turbocharger unit 16 . The turbine shaft 18 drives a compressor wheel 19 of the turbocharger unit, which compresses incoming air via an intake duct 20 and delivers it to the intake manifold 13 via an air intercooler 21 . Fuel is supplied to each cylinder 12 by injection means (not shown). Although a six-cylinder engine is shown in the drawings, the invention is also applicable to other cylinder types.

[0012] Exhaust gas flowing through the turbocharger unit 16 is directed forward by an exhaust duct 22 to an oxidation filter arrangement 23 which separates particulate matter from the exhaust gas flow. Downstream of the filter device there is a three-way valve 24 which, according to the prior art, can lead the exhaust gas either through...

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PUM

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Abstract

The invention relates to a piston-type internal combustion engine (10) having an intake line (20) for delivering air to combustion chambers of the engine and an exhaust system (15, 22) for removing exhaust gases from said combustion chambers. The exhaust system comprises equipment (29, 30) for reducing environmentally harmful exhaust emissions from the engine, which is intended to function with variable load in order to propel a vehicle. The exhaust system (15, 22) comprises a branch pipe (26) controlled by a valve (24) and bypassing at least one part of the equipment (29, 30) for reducing environmentally harmful exhaust emissions. The valve (24) is controlled so that it leads the exhaust gas flow through the branch pipe (26) over a part of the overall load range of the engine. The engine is optimized in order to give acceptable exhaust emissions over said part of the overall load range of the engine.

Description

technical field [0001] The invention relates to a piston internal combustion engine having an intake duct for supplying air to a combustion chamber and an exhaust system for exhausting exhaust gases from said combustion chamber, the exhaust system comprising a Environmentally harmful exhaust gas emission equipment, in order to drive a motor vehicle, said engine can be operated under variable load. Background technique [0002] Regulatory requirements related to diesel engines are very stringent and will become more stringent, especially those related to emissions of nitrogen oxide pollutants and particulate matter. [0003] The amount of nitrogen oxides formed by the combustion of fuel in an engine cylinder depends on the combustion temperature. Higher temperatures lead to a higher proportion of nitrogen in the atmosphere being converted to nitrogen oxides. A known engine-based method for reducing the formation of nitrogen oxides is the so-called exhaust gas recirculation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/18F02B
CPCY02T10/146Y02T10/121Y02A50/20F01N3/18
Inventor 安德烈亚什·欣茨佩尔·萨洛蒙松伦纳特·安德森佩尔·佩尔松
Owner VOLVO LASTVAGNAR AB