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Method for early opening of exhaust valves for turbocharged heat engines

A technology of heat engine and turbocharger, which is applied in the computer field to achieve the effect of optimizing inflation

Active Publication Date: 2020-12-04
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the conventional control method of the exhaust valve 14, in some engine-vehicle combinations there is in some cases a surge phenomenon accompanied by a noise perceivable by the driver

Method used

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  • Method for early opening of exhaust valves for turbocharged heat engines
  • Method for early opening of exhaust valves for turbocharged heat engines
  • Method for early opening of exhaust valves for turbocharged heat engines

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Embodiment Construction

[0039] Identical, similar or analogous elements in different figures retain the same reference signs.

[0040] Such as Figure 7 As shown, the method according to the invention essentially comprises a critical situation identification step 100 and a control step 105 for opening the exhaust valve 14 early.

[0041] Thus, in step 100 the method identifies a critical situation where conventional control of the exhaust valve 14 is insufficient to avoid surge. For example, for severe load transients (such as a sudden foot lift from full load), in some systems surge is often observed at the onset of the transient because the exhaust valve 14 is not fully open. For example, this may be due to the exhaust circuit 13 or due to the waiting time between the control and implementation of the maximum opening of the exhaust valve 14 . On the other hand, for less sudden load transients, in this same system, if the conventional strategy of controlling the exhaust valve 14 is used, the waiti...

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Abstract

The present invention mainly relates to a method for controlling the early opening of an exhaust valve cooperating with an exhaust pipe having an upstream end upstream of a supercharger of a heat engine and a Downstream downstream end, characterized in that said method comprises: - the step (100) of detecting a critical situation, wherein said critical situation may trigger a surge phenomenon, and - after said critical situation is detected, controlling said discharge The step of opening the air valve in advance (105).

Description

technical field [0001] The invention relates to a method for early opening of an exhaust valve of a heat engine equipped with a turbocharger and to a computer for carrying out the method. Background technique [0002] A known, figure 1 The air circuit of the heat engine shown in includes a turbocharger 2 comprising a supercharger 3 and a turbine 4 . The supercharger 3 allows the compression of the incoming air to optimize the charging of the cylinders of the engine 5 . To this end, the supercharger 3 is arranged on the intake pipe 8 upstream of the engine 5 . The flow of exhaust gases rotationally drives a turbine 4 arranged on the exhaust pipe 9 which then rotationally drives the supercharger 3 via a coupling. [0003] The supercharger 3 is defined by its own champ compresseur. The boost fields represent the compression ratio R (corresponding to the ratio of the downstream air pressure Pav to the upstream air pressure Pam of the supercharger 3 ) as a function of the vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B37/16F02B39/16F02D41/00F02B37/12
CPCF02B37/16F02B39/16F02B2037/125F02D41/0007F02D41/045F02D41/10F02D2200/602Y02T10/12
Inventor 克莱门特·波利
Owner PEZHO SITROEN AUTOMOBILS SA
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