Device and method for compressor and charge air cooler protection in an internal combustion engine

摘要

A device is provided for compressor and charge air cooler protection in an internal combustion engine, such as a Diesel engine. The engine having an intake manifold and an exhaust manifold, first and second EGR routes, a charge air cooler, a turbocharger having a compressor and a turbine. A regulator is also provided for regulating the flow rate of exhaust gas and the splitting of exhaust gas between the first and second EGR route. A temperature sensor is also provided for sensing output temperature of gas at the outlet of said compressor. A method and computer readable medium embodying a computer program product are also provided that have a first phase of monitoring a parameter representative of the gas temperature at the output of the compressor and a second phase in which an activity involving engine components operation is performed. The activity is performed using temperature information determined in the monitoring phase.

主权项

1. An internal combustion engine with air cooler protection, comprising:
an intake manifold; an intake line corresponding to the intake manifold; an exhaust manifold; an exhaust line corresponding to the exhaust manifold; a first EGR route; a second EGR route; a charge air cooler located in the intake line upstream from the intake manifold and downstream the second EGR route; a turbocharger; a compressor of the turbocharger located in the intake line; a turbine in the exhaust line; a valve adapted to regulate a flow rate of an exhaust gas and a splitting of the exhaust gas between said first EGR route and said second EGR route; a temperature sensor adapted to measure a gas temperature at an outlet of said compressor; and a processor configured to:
determine if the gas temperature at the compressor output is greater than a predetermined threshold,reduce the gas temperature at the output of said compressor when the gas temperature is greater than the predetermined threshold by regulating, via the valve, the splitting of flow rates of the exhaust gas through the first EGR rout and the second EGR rout and maintaining the regulated flow rate of the exhaust gas through the first EGR rout and the second EGR rout for a predetermined time;deactivate the reducing of the gas temperature at the output of said compressor if the gas temperature is less than the predetermined threshold and the predetermined time has elapsed;receive an ambient temperature and a manifold temperature; andmonitor a charge air cooler efficiency on a basis of a relationship as follows under a condition that said first EGR route is substantially closed:CACefficiency=T⁢⁢com,out-TmanifoldT⁢⁢com,out-Tambient, where Tcom, out is the gas temperature at the output of said compressor, Tmanifold is the manifold temperature and Tambient is the ambient temperature.