Static internal combustion engine operating states in vehicle driving tests

Monika Andrych-Zalewska,Jacek Pielecha,Zdzisław Chłopek,Jerzy Merkisz

doi:10.19206/ce-2019-209

Abstract

The article presents the compression-ignition engine test results of static operating states in driving tests: NEDC (New European Driving Cycle), RDE (Real Driving Emissions) and the Malta custom test cycle, developed at the Poznan University of Technology. The NEDC and Malta tests were carried out as drive cycle simulations on the engine test bench, the RDE test was carried out in the real driving conditions. The engine operating states are described by the physical quantities of speed and torque. For each of the tests, zero- -dimensional characteristics of the values describing the engine operation states were determined, including: mean value and average standard deviation and coefficient of variation. Histograms of quantities describing the engines operating states for considered tests and driving conditions were also determined. A large diversity of zero-dimensional characteristics of the quantities describing the engines operating states for the considered driving tests and driving conditions was found.

Highlights

The knowledge gap about the usable properties of internal combustion engines in their real operating conditions means that the results of tests that are only compatible with the type approval procedures are no longer sufficient
In order to assess the exhaust emission in conditions deviating from the conditions of type approval procedures, and burdened with a certain uncertainty of accidental processes, the tests of car engines in real operating conditions were introduced
The Real Driving Emissions (RDE) [6, 7] procedure allows the study of exhaust emissions from a car engine through the use of Portable Emissions Measurement System (PEMS)

Summary

Introduction

The knowledge gap about the usable properties of internal combustion engines in their real operating conditions means that the results of tests that are only compatible with the type approval procedures are no longer sufficient. The functional properties of internal combustion engines, which are strongly dependent on the operating conditions of the engines, both static and – most of all – dynamic, are the values characterizing the exhaust emission [3, 4] and, to a lesser degree, fuel consumption. In order to assess the exhaust emission in conditions deviating from the conditions of type approval procedures, and burdened with a certain uncertainty of accidental processes, the tests of car engines in real operating conditions were introduced. The subject of the research were static states of combustion engine operation, corresponding to dynamic states in real engine operation conditions

Research aim and objects

Empirical test results

Analysis of an internal combustion engine operating states

Conclusions