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Thermal Protection Method for Heat Engine Exhaust System Components

An exhaust system and thermal protection technology, which is applied in the direction of electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust treatment, etc., can solve problems that do not involve thermal protection of exhaust system components, etc.

Active Publication Date: 2017-02-22
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the aforementioned patent documents addresses the thermal protection of exhaust system components by the concentration of hydrocarbon / air mixtures that allow the exhaust gases to cool

Method used

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  • Thermal Protection Method for Heat Engine Exhaust System Components
  • Thermal Protection Method for Heat Engine Exhaust System Components
  • Thermal Protection Method for Heat Engine Exhaust System Components

Examples

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Embodiment Construction

[0027] figure 1 The exhaust system 10 of the heat engine 12 with its cylinder head 14 is shown schematically. Exhaust gas is expelled from the cylinder 16 through an exhaust valve 18 into an exhaust gas collection device 20 . The gas then passes sequentially through a turbocharger (for boosting the engine) with a turbine 24 and a bypass section 26 (wastegate), a catalyst 28 with an upstream oxygen probe 30 and a downstream probe 32, and mufflers 34 and 36 . Points for thermal monitoring and components requiring thermal protection are primarily upstream 40 of turbocharger 22, upstream 42 and downstream 44 of catalyst 28 with probes 30 and 32, and interior 46 of catalyst 28 and collector 20 (the collector monitoring point is at figure 1 indicated by 48). According to the invention, components can be thermally protected using thermomechanical control. The goal to be achieved is that the temperature at the monitoring point does not exceed a critical value at which and beyond ...

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Abstract

The invention relates to a method for thermal protection of components of the exhaust system of a heat engine, according to which method it is possible to determine the temperature of the exhaust gas and the wall of the exhaust system and to detect the temperature of the exhaust system which has reached the maximum temperature limit part. The method according to the invention consists in: - determining (54) a temperature setpoint T3 consigne of the exhaust gas at the outlet of the engine, and - formulating (56) a concentration setpoint ΦConsigne capable of ensuring the exhaust gas temperature setpoint.

Description

technical field [0001] The invention relates to a thermal protection method for heat engine exhaust system components. The hydrocarbon fuel in the heat engine mentioned here is gasoline. The heat engine can be supercharged or not, and can be directly or indirectly injected. Background technique [0002] The heat engine exhaust system components are composed of components located in the combustion gas discharge pipe. The combustion gas is initially discharged along the discharge direction through the exhaust valve, and successively passes through the exhaust gas collection device, the turbocharger of the supercharged heat engine, and the probe. (such as oxygen probe) catalytic converter, and finally through the muffler. Hot engine exhaust system components may be overheated or not, depending on engine operating conditions. If the temperature of the exhaust gas is too high, the component temperature may exceed a critical temperature, from which the component may be damaged. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F02D41/02F02D41/22
CPCF01N11/005F02B37/18F02D41/0235F02D41/22F02D2200/0804
Inventor G·阿莱格尔E·克雷特萨斯
Owner PEZHO SITROEN AUTOMOBILS SA