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Method for braking internal combustion engine

A technology of internal combustion engine, four-stroke internal combustion engine, applied in the direction of engine components, machine/engine, valve control, etc.

Active Publication Date: 2019-04-12
MAN NUTZFAHRZEUGE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method known from DE 10 2013 019 183 A1 has the disadvantage that, at low engine speeds, an undesired engine excitation occurs due to gas compression during the exhaust stroke, if, for example, during engine braking actuation it is not All cylinders are working

Method used

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  • Method for braking internal combustion engine
  • Method for braking internal combustion engine

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Embodiment Construction

[0031] figure 1 Cylinders 12 of internal combustion engine 10 are shown. The internal combustion engine 10 is a four-stroke internal combustion engine, in particular a four-stroke diesel internal combustion engine or a four-stroke gasoline internal combustion engine. The internal combustion engine 10 is preferably contained in a commercial vehicle, such as a truck or a bus, for driving the commercial vehicle.

[0032] Cylinder 12 has at least one intake valve 14 , at least one exhaust valve 16 , a combustion chamber 18 and a piston 20 .

[0033] At least one intake valve 14 connects the combustion chamber 18 to an air supply system of the internal combustion engine 10 for supplying combustion air into the combustion chamber 18 . At least one exhaust valve 16 connects the combustion chamber 18 to an exhaust line of the internal combustion engine 10 which serves to discharge exhaust gases. For example, two intake valves 14 and two exhaust valves 16 may be provided for each cyli...

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Abstract

The present disclosure relates to a method for braking of an internal combustion engine (10), in particular a four-stroke internal combustion engine (10). The method involves a partial opening of at least one gas discharge valve (16) of at least one cylinder (12) of the internal combustion engine (10) during a compression stroke of the internal combustion engine. The method involves a holding of apartial opening of the at least one gas discharge valve (16) during an expansion stroke of the internal combustion engine (10) following the compression stroke and during an exhaust stroke of the internal combustion engine following the expansion stroke. The method involves a closing of the partly opened at least one gas discharge valve at the end of the exhaust stroke or during an intake strokeof the internal combustion engine following the exhaust stroke.

Description

technical field [0001] The invention relates to a method for braking an internal combustion engine and to a motor vehicle with a variable valve drive for carrying out the method. Background technique [0002] DE 39 22 884 A1 describes a method in which, during engine braking operation, in addition to closing the dust cover in the exhaust line, a decompression effect which significantly increases the engine braking effect is achieved in the following way: Exhaust The valves are partially opened during the compression stroke by intervening in the valve control of the internal combustion engine (the intake valve remains unchanged), so that the air drawn into the cylinder during the intake stroke is discharged into the exhaust line decompressed. In addition, the respective exhaust valves are fully open during the exhaust stroke during conventional actuation, so that there is almost no decompression effect here. [0003] Exemplary further methods for braking an internal combusti...

Claims

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Application Information

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IPC IPC(8): F02D13/04
CPCF02D13/0215F02D13/0249F02D13/0257F02D13/04F02D41/12F02D2041/001F02D13/0246F02D2200/101F01L13/0042F01L13/065F01L2760/003
Inventor 托马斯·玛丽斯澈威思科多米尼克·雷纳
Owner MAN NUTZFAHRZEUGE AG
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