Evaluation of impact of combustion engine controller adaptation process on level of exhaust gas emissions in gasoline and compressed natural gas supply process
2020
Dziewiatkowski, M., Bialystok Univ. of Technology (Poland) | Szpica, D., Bialystok Univ. of Technology (Poland) | Borawski, A., Bialystok Univ. of Technology (Poland)
Nowadays in many countries, where the conversion of internal combustion engines into alternative gas fuel is economically justified, the installation of CNG fuel systems dominates. According to official data, about 20 million vehicles with engines running on this fuel travel on the roads. Given the significant increase in the number of conversions carried out, special attention should be paid to the level of exhaust emissions of these vehicles. As many researchers show in their publications, combustion of this type of fuel emits less toxic compounds to the atmosphere than conventional fuels. Therefore, ecological aspects also speak for its use, which nowadays, mainly due to significant air pollution, are extremely important. In the case of conversion of vehicles with gasoline engines sequentially controlled by the engine controller, it is possible to adjust the adaptation of the parameters of this controller in various driving cycles, which affects the changes in vehicle emissions from the initial settings of this system. The article describes a number of bench tests that confirm the above statement. Extensive measuring equipment was used, which included, among others, the chassis dynamometer and exhaust gas analyser. The results of the tests clearly showed that with the passage of using time of the vehicle (increasing mileage) one of the parameters in the control system changes significantly, which also changes the level of exhaust emissions. Unfortunately, this is an unwanted change. It has been suggested to counteract this phenomenon by emulating the lambda probe signal. The proposed solution has been implemented and tested. A series of exhaust emission tests of an engine equipped with a modified power supply system showed the correctness of the adopted solution.
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