Anti-icing system and method for air inlet pipeline

Abstract

The invention provides an anti-icing system and method for an air inlet pipeline, and belongs to the technical field of automobile engines. The system is applied to a vehicle, a dew-point temperaturesensor is arranged at an outlet of an intercooler and sends the dew-point temperature at the outlet of the intercooler to a control module in real time, the control module accurately predicts whetherthe icing risk exists or not in the engine air inlet pipeline according to the dew-point temperature at the outlet of the intercooler and the air temperature at the outlet of the intercooler in combination with a hysteresis temperature value, and sends a starting or closing instruction to an EGR controller, the icing risk of the engine air inlet pipeline is avoided, the utilization rate of an EGRsystem is increased, and the economical efficiency of whole vehicle power is improved.

Description

technical field [0001] The present application relates to the technical field of automobile engines, in particular to an anti-icing system and method for an air intake pipeline. Background technique [0002] EGR is the abbreviation of (Exhaust Gas Re-circulation), that is, the abbreviation of exhaust gas recirculation. Exhaust gas recirculation refers to the return of part of the exhaust gas from the engine to the intake manifold, and re-enters the cylinder together with the fresh mixture. EGR mainly plays a role through the following aspects: the carbon dioxide and water vapor in EGR greatly increase the specific heat capacity of the working medium, and the addition of exhaust gas also dilutes the oxygen concentration in the original mixed gas, thereby slowing down the combustion speed and making the combustion process Both the maximum temperature and the average temperature have decreased. Gasoline engines equipped with EGR have a lower combustion temperature and slower ...

AI Technical Summary

Problems solved by technology

However, for the low-pressure EGR (LPEGR) system, when working in a low-temperature environment, the temperature of water vapor suddenly drops when passing through the intercooler, and the water vapor in the intake air condenses into small droplets because the temperature is lower than the dew point temperature. If the temperature is lower than zero degrees Celsius, the small droplets precipitated in the air will condense into ice, which will block the intake system and affect the normal operation of the engine. In severe cases, the engine-related hardware will be lost.

[0004] The existing technology is not accurate enough to judge the timing of EGR switch. Generally, it is considered conservative to set the temperature limit higher, that is, in many cases, EGR opening will not cause the intake system to freeze. The ECU will also turn off EGR, reducing the utilization rate of EGR. The EGR cannot fully play its role, resulting in a decline in the power and economy of the vehicle

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