Turbocharged internal combustion engine with system and method f

Details Turbocharged internal combustion engine with system and method f Turbocharged internal combustion engine with system and method f

1999-04-01

2000-08-22

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Fuel injection system

123 9015, F02M 5704, F01L 1300

Patent

active

061055557

ABSTRACT:
An improved turbocharged internal combustion engine is provided having a system and method for preventing a rapid decrease of turbocharger power during rapid fuel reduction transients in engine operation due to reductions in fuel flow rate to the engine. The engine includes a turbocharger power enhancing system including an exhaust valve control device capable of varying the timing of opening of the engine exhaust valves. The turbocharger power enhancing system also includes a processor which generates a control signal when a reduction in the fuel delivery rate is detected. The control signal operates the exhaust valve control device to advance the timing of opening of the exhaust valves to cause additional exhaust gas to be delivered to the turbine thereby preventing a rapid decrease of compressor speed and preventing compressor surge. The system and method may require the presence of one or more other engine operating conditions before the exhaust valve timing may be advanced, such as a minimum intake pressure, a minimum reduction in the fuel rate, a fuel rate reduction within a specific time period and/or an engine speed below a predetermined value.

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Gennady V. Ivanov and Frederick Tepper, "Activated Aluminum as a Stored Energy Source for Propellants", Presented at the Fourth International Symposium, Stockholm, Sweden, May 27-28, 1996.

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