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Determination of characteristics of pollutant emission from a vehicle engine under traffic conditions in the engine test

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

Combustion Engines

2022

R. 61, nr 4

58--65

The paper describes the method of determination of exhaust emission characteristics from a vehicle engine based on the results obtained in a driving test simulated on an engine dynamometer. These characteristics are the relations between the specific distance emissions and the zero-dimensional characteristics of the process of vehicle velocity: the average velocity value and the average value of the absolute value of the product of vehicle velocity and acceleration. The exhaust emission characteristics are used to simulate the emissions from vehicles operating in different types of traffic conditions. The engine operating states in the engine dynamometer tests were determined by the operating conditions of the vehicle during the test. The authors applied the Monte Carlo method in order to determine the characteristics of different values of the zero-dimensional characteristics of the vehicle velocity process. This enabled the determination of the characteristics based on the test results from a single realization of the process of vehicle velocity. Additionally, the developed method allowed a replacement of the empirical research on the chassis dynamometer with the one performed on the engine dynamometer. The obtained exhaust emission characteristics are in line with the characteristics obtained on the chassis dynamometer in multiple tests.

Simulation method of operating parameters assessment used for engine comparative analysis

Kiernicki Z.

Silniki Spalinowe

2008

R. 47, nr 1

73-78

The methodology of engine operating parameters assessment that could be used for comparative tests has been presented in the paper. The basic assumption is that the engine is tested during free acceleration. Another assumption of the presented method is that the relative change of parameter could be assessed on the basis of values which are close to exact parameter values. All these parameters are both measured with the same accuracy and under the same conditions. The accuracy of the model has been identified for S-4002 engine. The sample test results have been presented.

W artykule przedstawiono metodykę określania parametrów roboczych silnika przydatnych do badań porównawczych. Podstawowymi założeniami proponowanej symulacyjnej metody określania parametrów są: 1) silnik powinien być badany na biegu luzem podczas gwałtownego rozpędzania, 2) zmiana względna parametru może być oszacowana na podstawie wartości zbliżonych do poziomu wartości bezwzględnych, mierzonych z tą samą dokładnością i w takich samych warunkach pomiaru. Przedstawiono przykładowe wyniki przeprowadzonych testów.