IMPACT OF VARIABLE INTAKE-VALVE-TIMING ON HOMOGENEOUS CHARGE COMPRESSION IGNITION (HCCI) ENGINE PARAMETERS

Document Type : Original Article

Authors

1 Ass. Lecturer, Mechanical Power Engineering Dept., Menoufiya University, Shebin El-Kom, Egypt (On leave), PhD student, Mechanical Engineering Dept, University of Birmingham, UK.

2 PhD student, Mechanical Engineering Dept, University of Birmingham, UK.

3 Professor of Novel Vehicle Technology and Applied Thermodynamics, Mechanical Engineering Dept, University of Birmingham, UK.

4 Reader in Automotive Engineering, Mechanical Engineering Dept, University of Birmingham, UK.

5 Lecturer in Automotive Engineering, Mechanical Engineering Dept, University of Birmingham, UK.

Abstract

ABSTRACT
The effects of variable intake-valve-timing on the gas exchange process and
performance of a 4-valve direct injection HCCI engine were computationally
investigated using a 1D fluid-dynamic engine cycle simulation code. A non-typical
intake valve strategy was examined; whereby the intake valves were assumed to be
independently actuated with the same valve-lift profile but at different timings. Using
such an intake valves strategy, the obtained results showed a significant improvement
of the engine parameters such as load and volumetric efficiency when compared with
those of the typical intake-valve-timing case. Additionally, minimizing the pumping work
penalty, and consequently improving the fuel economy, was shown as an advantage of
using the non-typical intake-valve-timing with the timing of the early intake valve
coupled with a symmetric degree of exhaust-valve-closing timing.

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