Detroit Diesel Corporation

Xiaobin Li

Zornitza Pavlinova Pavlova-MacKinnon

He Jiang

Rakesh Aneja

Adedejo Bukola Oladipo

A method of reducing nitrogen oxides (NOx) and particulate matter (PM) in compression ignition engine emissions. The method includes monitoring at least one engine sensor that generates a signal in response to at least one engine operating condition, and adjusting at least one engine control parameter in response to the signal such that in-cylinder spacial distribution of equivalence ratio and temperature is substantially maintained to an operating region. The operating region corresponds to a set of equivalence ratio with respect to temperature values that are substantially outside regions supportive of NOx and PM formation. The temperature values are greater than 1650 K, and the equivalence ratio values are greater than 0.5.

System and method for reducing compression ignition engine emissions

A fuel injector assembly is provided which includes a control valve actuated by a piezoelectric actuator acting through a hydraulic amplifier to facilitate pressurization of fluid fuel within the fuel injector assembly for dispersing the fuel into a combustion chamber. The piezoelectric actuator is excited by a variable voltage source to control the degree of displacement of the hydraulic amplifier to control the degree of fluid fuel dispersement by controlling the degree of displacement of the control valve. The configuration of the control valve may be such as to provide multi-step fluid fuel dispersing thereby providing a low fuel injection pressure and rate followed by a higher fuel injection pressure and rate. Multi-step fluid fuel dispersing may also be accomplished by varying the level of excitation voltage to the piezoelectric actuator. A pressure check valve is provided to prime the hydraulic amplifier cavity, to expel trapped air therefrom, to compensate for fuel leakages from the cavity and to circulate fuel through the cavity. An internal combustion engine including such a fuel injector assembly is also provided.

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Livonia, MI, United States of America

Xiaobin Li