ASSESSMENT OF CHARGE-AIR COOLER HEALTH IN DIESEL ENGINES USING NONLINEAR TIME SERIES ANALYSIS OF INTAKE MANIFOLD TEMPERATURE

Degradation in the cooling effectiveness of a charge-air cooler in a medium-duty turbocharged diesel engine has signif-icant impact on engine performance. This degradation lowers the boost pressure and raises the intake manifold temperature. As a result, the engine provides lower horsepower and higher hydrocarbon levels than the rated values. The objective of this research is to monitor the health of the charge-air cooler by ana-lyzing the intake manifold temperature signal. Experiments were performed on a Cummins ISB series turbocharged diesel engine, a 6-cylinder inline configuration with a 5.9 liter displacement volume. Air flowing over the cooler was blocked by varying amounts, while various engine temperatures and pressures were monitored at different torque-speed conditions. Similarly, data were acquired without the introduction of any fault in the engine