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求文主要介绍TICS（喷油定时及喷油速率控制系统）前期喷射的可行性研究。利用新开发的在TICS中采用的前期喷射部件可获得具有适当的前期喷射油量和前期喷射-主喷射之间的间隔。为了弄清前期喷射的效果，已在一台自然吸气式单缸机上做了试验。试验结果表明，它有利于降低NOX、HC、制动比油耗及噪声，但是前期喷射油量要尽可能小，使烟度排放的恶化尽可能小。最后，详细地论述了TICG前期喷射的可行社研究的最新成果．
This article mainly introduces the feasibility study of TICS (injection timing and injection rate control system) pre-injection. With the newly developed pre-injection components used in TICS, it is possible to obtain an appropriate amount of pre-injection fuel and a pre-injection-main injection interval. In order to clarify the effect of the early jet, has been tested on a naturally aspirated single-cylinder machine. Test results show that it is beneficial to reduce NOX, HC, fuel consumption and noise of brake ratio, but the amount of fuel injection should be as small as possible so that the deterioration of smoke emission is as small as possible. Finally, the latest achievements of the feasibility study of early TICG injection are discussed in detail.