Improving the performance of the Chinese B135 six-cylinder direct injection turbocharged and turbocompounded Low Heat Rejection Engine (LHRE) was based on experimental and analytical studies. The studies were primarily applied on a B1135 single-cylinder LHR engine and a conventional water-cooled B1135 single cylinder engine. Performance of the B1135 LHRE was worse than that of the conventional B1135 due to a deterioration in the combustion process of the B1135 LHRE. The combustion process was improved and the fuel injection system was redesigned and applied to the B135 six-cylinder LHRE. The new design improved the performance of the LHRE and better fuel economy was realized by the thermal energy recovered from the exhaust gases by the turbocompounding system.
In order to acquire vehicle emissions and fuel economy by driving a vehicle on a chassis dynamometer, it is imperative that the chassis dynamometer should exactly simulate the road experience of the vehicle. In this paper, the modelling of a heavy-duty vehicle energy consumption both on the road and on a chassis dynamometer was developed and implemented by using two driving cycles. Road coast-down tests of a vehicle were conducted to obtain a road load equation of the vehicle. Its companion chassis dynamometer coast-down tests were aimed to estimate the characteristics of the dynamometer-vehicle system. Power absorber settings were achieved that duplicate the vehicle road load in the dynamometer testing. Comparing the measured energy of the vehicle between driving cycles on the chassis dynamometer and the calculated energy on the road, it is shown that the West Virginia University (WVU) transportable heavy-duty chassis dynamometer is successful in simulating the vehicle road load conditions when conducting emissions testing.
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