Blow-by through Exhaust Valve Seats in Diesel Engines. 1st Report. Hot Corrosion on Surface of Exhaust Valve Seats.

On Dynamic Stresses in Compressor Valve Reeds or Plates During Colinear Impact on Valve Seats

Extending Exhaust Gas Recirculation Limits in Diesel Engines

This paper addresses the application of high exhaust gas recirculation (EGR) for reduced nitrogen oxide emissions from diesel engines. The research objective is to develop fundamental information about the relationship between EGR parameters and diesel combustion instability and particulate formation so that options can be explored for maximizing the practical EGR limit, thereby further reducin...

Exhaust Emissions and Performance of Diesel Engines with Biodiesel Fuels

The use of biodiesel fuels derived from vegetable oils or animal fats as a substitute for conventional petroleum fuel in diesel engines is receiving an increasing amount of attention. This interest is based on a number of properties of biodiesel including the fact that it is produced from a renewable resource, its biodegradability, and its potential to reduce exhaust emissions. Transient exhaus...

Estimation of Exhaust Manifold Pressure in Turbocharged Gasoline Engines with Variable Valve Timing

Feedforward A/F control in turbocharged gasoline engines with variable valve timing requires knowledge of exhaust manifold pressure, Pe. Physical conditions in the manifold make measurement costly, compelling manufacturers to implement some form of on-line estimation. Processor limitations and the calibration process, however, put constraints on estimator complexity. This paper assesses the fea...

Control of Charge Dilution in Turbocharged CIDI Engines via Exhaust Valve Timing

ABSTRACT Stringent NOx and particulate emission constraints require high levels of exhaust gas recirculation. In this paper we model and analyze a Variable Valve Timing methodology that in steady-state achieves large levels of internal Exhaust Gas Recirculation (iEGR) or residual charge in Compression Ignition Direct Injection (CIDI) engines. Current external Exhaust Gas Recirculation (eEGR) te...