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The Next Generation BOSCH Common Rail Injectors with Digital Rate Shaping – A Key Factor for Meeting Future Requirements

机译:具有数字速率整形功能的下一代BOSCH共轨喷油器-满足未来需求的关键因素

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Over the entire operating map of a Diesel engine there is a complex relationship between fuelconsumption, exhaust and noise emissions. Pilot injections (PI) can be applied to optimizethe combustion process – with the degrees of freedom being limited for conventional PIstrategies. However, these limitations can be overcome by launching the pilot injectionimmediately before the main injection. This digital injection pattern (pilot injection / maininjection) results in a "soft" and uninterrupted combustion process, reducing noise emissionsand permitting a further reduction in emissions and fuel consumption.This Digital Rate Shaping strategy places new requirements onto the injector in terms of thetime interval between pilot injection and main injection, the precision of quantities injected,and reproducibility. Development of the new solenoid-valve injector CRI2-20 which uses anew basic concept with an integral high-pressure volume and a "long-needle" design wastargeted to meet these requirements. This injector's multiple injection features a uniquemetering precision and bears the potential for a further reduction of noise emissions.Combustion concepts with extremely short injection intervals resulting in optimized CO2emissions can be applied to further increase the fuel economy of Diesel engines.The new CRI2-20 by BOSCH is part of a modular range which can be expanded towardshigher injection pressures; thus the advantages and the attractiveness of the Diesel enginecan be further enhanced in the future.
机译:在柴油发动机的整个运行图上,燃油之间存在复杂的关系 消耗,废气和噪音排放。可以采用先导注入(PI)进行优化 燃烧过程–传统PI的自由度受到限制 策略。但是,可以通过启动先导注入来克服这些限制 在紧接主要注射之前。此数字注入模式(先导注入/主 喷射)导致“软”且不间断的燃烧过程,从而减少了噪声排放 并进一步减少排放和燃料消耗。 这种数字速率整形策略对喷射器提出了新的要求。 引燃喷射和主喷射之间的时间间隔,喷射量的精度, 和可重复性。新型电磁阀喷油器CRI2-20的开发使用了 新的基本概念是带有一体式高压容积和“长针头”设计的 有针对性地满足这些要求。该喷油器的多次喷油具有独特的功能 计量精度,并有可能进一步降低噪声排放。 极短的喷射间隔的燃烧方案可优化CO2 可以应用排放来进一步提高柴油机的燃油经济性。 BOSCH的新CRI2-20是模块化范围的一部分,可以扩展到 更高的注射压力;因此,柴油机的优势和吸引力 将来可以进一步增强。

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