Optimal control object that is comprised of power and economy was provided basis of the practical condition. According to the variational methods and the theory and practice of engine,the math model of the oil-gas switch process was built.
分析了两用燃料发动机性能恶化的原因和油气切换过程,分析了切换过程中引起速度波动的原因,并综合考虑发动机的动力性和经济性,提出了油气切换过程优化控制的目标函数,并依据变分法和发动机的相关理论与实践知识,建立了油气切换过程的简化数学模型。
参考来源 - 天然气/汽油两用燃料发动机燃料切换的优化控制·2,447,543篇论文数据，部分数据来源于NoteExpress
The idea is that Americans could switch en masse to natural gas vehicles, and the country could stop importing so much oil.
该想法就是，美国可使公众换用天然气汽车，以及国家不用再进口如此多的石油。
But with energy, or food, customers have options: they can switch from oil to natural gas, or eat more chicken and less beef. There is no substitute for water, not even Coca-Cola.
但是，能源、食物消费者可以有所选择：可以用天然气取代石油或者多吃些鸡肉少吃些牛肉，而水，甚至可口可乐，却无可替代。
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