Low-Load Limit in a Diesel-Ignited Gas Engine
Institute for Dynamic Systems and Control, ETH Zurich, 8092 Zurich, Switzerland
Current address: Sonneggstrasse 3, 8092 Zurich, Switzerland.
Author to whom correspondence should be addressed.
Academic Editor: Rui Xiong
Received: 15 August 2017 / Revised: 1 September 2017 / Accepted: 14 September 2017 / Published: 21 September 2017
The lean-burn capability of the Diesel-ignited gas engine combined with its potential for high efficiency and low CO
emissions makes this engine concept one of the most promising alternative fuel converters for passenger cars. Instead of using a spark plug, the ignition relies on the compression-ignited Diesel fuel providing ignition centers for the homogeneous air-gas mixture. In this study the amount of Diesel is reduced to the minimum amount required for the desired ignition. The low-load operation of such an engine is known to be challenging, as hydrocarbon (HC) emissions rise. The objective of this study is to develop optimal low-load operation strategies for the input variables equivalence ratio and exhaust gas recirculation (EGR) rate. A physical engine model helps to investigate three important limitations, namely maximum acceptable HC emissions, minimal CO
reduction, and minimal exhaust gas temperature. An important finding is the fact that the high HC emissions under low-load and lean conditions are a consequence of the inability to raise the gas equivalence ratio resulting in a poor flame propagation. The simulations on the various low-load strategies reveal the conflicting demand of lean combustion with low CO
emissions and stoichiometric operation with low HC emissions, as well as the minimal feasible dual-fuel load of
bar brake mean effective pressure.
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MDPI and ACS Style
Hutter, R.; Ritzmann, J.; Elbert, P.; Onder, C. Low-Load Limit in a Diesel-Ignited Gas Engine. Energies 2017, 10, 1450.
Hutter R, Ritzmann J, Elbert P, Onder C. Low-Load Limit in a Diesel-Ignited Gas Engine. Energies. 2017; 10(10):1450.
Hutter, Richard; Ritzmann, Johannes; Elbert, Philipp; Onder, Christopher. 2017. "Low-Load Limit in a Diesel-Ignited Gas Engine." Energies 10, no. 10: 1450.
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