在旋转柴油发动机中的燃料反应性分层

Fuel reactivity stratification in rotary diesel engines

Abstract

具有低反应性(低十六烷值)的第一燃料填充物在进气冲程期间被足够早地喷射入旋转发动机,例如汪克尔发动机,随后的较高反应性喷射的燃料填充物形成了在发动机腔室内的一个或多个分层的高反应性区域。然后压缩点火在高反应性区域处开始,并且传播至较低反应性区域。喷射的时间、量和其它参数的适当选择可允许控制燃烧的时间和速率,使得功输出被可最大化,未燃烧的燃料可被最小化,并且腔室温度可受控制以减少热损失和NOx排放。因此,可提高旋转发动机效率,同时减少排放。由于本发明可在重量轻且紧凑的旋转发动机中实施,故其颇适于用在混合动力和紧凑型车辆中。
A first fuel charge having low reactivity (low cetane number) is injected into a rotary engine, e.g., a Wankel engine, sufficiently early during the intake stroke that a subsequent higher-reactivity injected fuel charge forms one or more stratified high-reactivity regions within the engine chamber. Compression ignition then begins at the high-reactivity regions and propagates to the lower-reactivity regions. Appropriate choice of the timings, quantities, and other parameters of the injections can allow control of the timing and rate of combustion, such that work output can be maximized, unburned fuel can be minimized, and chamber temperature can be controlled to reduce heat losses and NOx emissions. As a result, rotary engine efficiency can be enhanced while emissions are reduced. Since the invention can be implemented in a lightweight and compact rotary engine, it is well suited for use in hybrid and compact vehicles.

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