Search Results

This paper introduces research work on 1-D model of Roots type supercharger with helical gears using 1-D simulation tool. Today, passenger car engine design follows approach of downsizing and the reduction of number of engine cylinders. Superchargers alone or their combination with turbochargers can fulfill low-end demands on engine torque for such engines. Moreover, low temperature combustion of lean mixture at low engine loads becomes popular (HCCI, PCCI) requiring high boost pressure of EGR/fresh air mixture at low exhaust gas temperature, which poses too high demands on turbocharger efficiency. The main objective of this paper is to describe Roots charger features and to amend Roots charger design.

The paper describes a simple simulation tool for determination of vehicle energy consumption under dynamic conditions, suitable for early stages of design and linked to other tools being developed inside Vehicle concepts modeling (VECOM) project framework. The simulation tool is based on ordinary differential equations and a dynamic expandable library of vehicle component features. It describes vehicle dynamics in longitudinal direction and the appropriate efficiencies of engine, transmission and accumulation components (if used). All required data may be obtained by targeted simulations using multi-dimensional methods or by experiments. The simplified algorithms finding the best usage of powertrain chain efficiency in dependence on required pre-defined operation conditions (real driving record or a driving test cycle) were established.