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Exhaust gas recirculation with reduced condensate formation

A technology of exhaust gas recirculation and air supply, applied in exhaust gas recirculation, electrical control, charging system, etc., which can solve problems such as compressor blade damage, compressor damage, and complete compressor failure.

Pending Publication Date: 2019-12-13
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When condensate or liquid droplets from the compressor are drawn in with the exhaust-air mixture, this can lead to damage to the compressor, especially to the compressor blades, and complete failure of the compressor

Method used

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  • Exhaust gas recirculation with reduced condensate formation
  • Exhaust gas recirculation with reduced condensate formation
  • Exhaust gas recirculation with reduced condensate formation

Examples

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Embodiment Construction

[0027] figure 1 It is schematically shown that the humidity saturation curve is represented as a graph as a function of temperature for various pressures. Humidity is plotted on the x-axis in units of kg water / kg dry exhaust-air mixture. The temperature T is plotted on the y-axis in degrees Celsius (°C). Curve 1 represents the saturation curve for an exhaust-air mixture at a pressure of 0.75 bar. In other words, it is characterized at 0.75 bar The relative humidity of the exhaust-air mixture. Curve 2 characterizes the saturation curve for the exhaust-air mixture at a pressure of 0.9 bar. Curve 3 characterizes the saturation curve of the exhaust-air mixture at a pressure of 1.0 bar. A further saturation curve is indicated illustratively with reference number 5 . Arrow 4 indicates the region of saturation curve 3 where condensation occurs. Thus, condensation occurs if the temperature decreases in the direction of arrow 4 or if the humidity increases in the direction of a...

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Abstract

The invention relates to exhaust gas recirculation with reduced condensate formation. The invention relates to a method for operating a combustion engine (10) having a supercharger (11) comprising a turbine (12) and a compressor (13) and having a device for exhaust gas recirculation, wherein, during exhaust gas recirculation, exhaust gas discharged by the combustion engine flows through the turbine (12), mixes with air downstream of the turbine (12), and is supplied (41) to the compressor (13). The method comprises the following steps of: a step of preparing a precursor; determining (42) the temperature, pressure and humidity of the exhaust-air mixture upstream of the compressor; the maximum humidity of the exhaust-air mixture is established (43) for the determined temperature as a function of the pressure, and-if the determined humidity of the exhaust-air mixture is higher than the established maximum humidity (44), the pressure of the exhaust-air mixture upstream of the compressor isreduced (46) to a pressure higher than the maximum humidity (45).

Description

technical field [0001] The invention relates to a method and a device for operating a combustion engine with exhaust gas recirculation. The invention also relates to a motor vehicle. Background technique [0002] Modern diesel engines use highly efficient low-pressure exhaust gas recirculation systems to reduce nitric oxide in the exhaust from internal combustion engines. Especially in order to meet future legal regulations, it is necessary to achieve the lowest possible emission levels over the entire operating range of the engine and taking into account the widest possible range of ambient conditions (e.g. operation at altitudes up to 1300 m). A LP EGR system can better compensate for power loss at higher altitudes than a high pressure EGR system. At the same time, the outside temperature drops as higher altitudes are reached. [0003] Low external temperatures at sea level or at greater altitudes present the risk that water contained in the mixture of recirculated exha...

Claims

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Application Information

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IPC IPC(8): F02D21/08F02D23/00
CPCF02D21/08F02D23/005F02D23/00F02D41/0002F02D41/0007F02D41/0065F02D41/144F02D2200/0414F02D2200/0418F02M26/06F02M26/19Y02T10/12Y02T10/40
Inventor J·施蒂夫F·文德利希J·克默林E·梅斯克C·维吉尔德
Owner FORD GLOBAL TECH LLC
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