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Experimental investigation of the concomitant injection of gasoline and CNG in a turbocharged spark ignition engine

机译：涡轮增压火花点火发动机中汽油和CNG的同时喷射的实验研究

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摘要

Concomitant injection of gasoline and CNG is a new concept to overcome problems of bi-fueled spark ignition engines, which operate in single fuel mode, either in gasoline or in CNG mode. This experimental study indicates how some problems of gasoline mode such as retarded ignition timings for knock prevention and rich air-fuel mixture for component protection can be resolved with the concomitant injection of gasoline and CNG. Results clearly show that the concomitant injection improves thermal efficiency compared to gasoline mode. On the other hand, simultaneous injection of gasoline and CNG reduces some problems of CNG mode such as high cylinder pressure and heat loss to the engine coolant. This decreases the stringent requirements for thermal and mechanical strength of the engine components in CNG mode. In addition, it is shown that by modifying the spark advance and air fuel ratio in CNG mode, the engine operation improves in terms of NOx emissions and maximum in-cylinder pressure as the concomitant injection does. Nevertheless, new requirements such as an intercooler with higher cooling capacity are implied to the engine configuration. Finally, the most important concerns in control strategies of the engine control unit for a vehicle with concomitant injection of gasoline and CNG are discussed.
机译：汽油和CNG的同时喷射是克服双燃料火花点火发动机问题的新概念，该发动机以汽油或CNG模式的单燃料模式运行。这项实验研究表明，汽油和CNG的同时注入可以解决汽油模式的一些问题，例如，延迟点火正时以防止爆震和富含空气燃料混合物以保护部件。结果清楚地表明，与汽油模式相比，伴随喷射可提高热效率。另一方面，汽油和CNG的同时喷射减少了CNG模式的一些问题，例如汽缸压力高和发动机冷却液的热损失。这减少了CNG模式下对发动机组件的热和机械强度的严格要求。此外，还显示出，通过在CNG模式下修改火花提前量和空燃比，与伴随喷射一样，在NOx排放和最大缸内压力方面，发动机的运行也得到了改善。然而，新的要求，例如具有更高冷却能力的中间冷却器，隐含在发动机配置中。最后，讨论了伴随汽油和CNG喷射的车辆的发动机控制单元的控制策略中最重要的问题。

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