Charge air cooler arrangement with cooler bypass and method

Abstract

A charge air cooler arrangement includes a first charge air cooler disposed upstream of an engine inlet, a second cooler disposed upstream of the first charge air cooler, and a bypass line for bypassing the second cooler, a downstream end of the bypass line being disposed upstream of the first charge air cooler. A method of reducing condensation in an engine having charge air cooling is also disclosed.

Description

technical field [0001] The present invention relates to an intercooler arrangement, and more particularly, to an intercooler arrangement having a cooler bypass line. Background technique [0002] As seen in Figure 1A, which shows a conventional internal combustion engine 1, a turbocharger or supercharger 2 compresses incoming air causing it to be heated. Because hot air is less dense than cool air at the same pressure, less total air is delivered to the cylinders than it could possibly be. By cooling the intake air after compression using a device such as a charge air cooler (CAC)4 or an intercooler in a multi-stage turbo system, more intake air can be delivered to improve power. Additionally, devices such as CACs and intercoolers help increase the total boost allowed before knocking begins in the cylinders by reducing the temperature of the intake air. [0003] Exhaust gas recirculation (EGR) is a NOx (nitrogen oxides and nitrogen dioxide) reduction technology used in mo...

AI Technical Summary

Problems solved by technology

However, when only a portion of the charge air bypasses the CAC 4, even the mixture of the charge air that has bypassed the CAC and the charge air that has passed through the CAC can be at a temperature above the dew point, as Figure 1B Seen at point A in the graph of , but the charge air passing through the CAC may still be cooled to a temperature below the dew point, as seen at point B

Therefore, CAC bypass 10 does not completely solve the problem of condensation

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