YC4112ZLQ柴油机电控EGR系统的研究

为了降低柴油机的氮氧化物排放，对YC4112ZLQ增压中冷柴油机进行了电控废气再循环(EGR)技术的研究。试验研究了不同EGR率对发动机各个工况下性能和排放的影响规律，据此针对欧洲Ⅱ号标准优选出了各个工况下的最佳EGR率，并对最佳EGR率下的控制参数进行了电控标定。利用标定结果，设计了一套电子控制系统，用于该柴油机的实际运行。试验结果表明，与原机相比，加入EGR以后，在微粒排放略有增加的情况下，NOx排放下降12．9％，使13工况排放全面达到欧洲Ⅱ号标准的要求。     

Full-duplex fiber-wireless link with 40 Gbit/s 16-QAM signals for alternative wired and wireless accesses based on homodyne/heterodyne coherent detection

A novel full-duplex fiber-wireless link with 40 Gbit/s 16-ary quadrature amplitude modulation (QAM) signals is proposed to provide alternative wired and wireless accesses for the user terminals. In the central station (CS), the downstream signal for wired and wireless accesses is beared onto the CW laser source via an optical I/Q modulator to realize the QAM modulation. At the hybrid optical network unit (HONU), a tunable laser is used to provide coherent optical local oscillator for homo-/heterodyne beating to coherently down-convert the baseband optical signal to the baseband electrical one for wired access or to the mm-wave one for wireless access according to the requirement of the user terminals. Simultaneously, the lightwave from the tunable laser is also used as the uplink optical carrier for either wired or wireless access, and is modulated colorlessly by the baseband or mm-wave signal of the uplink alternatively. After filtering, only one tone carrying the uplink signal is transmitted back to the CS even for the wireless access. The theoretical analysis and simulation results show that our proposed full-duplex link for the alternative wired and wireless accesses maintains good performance even when the transmission link with standard single mode fiber (SSMF) is extended to 30 km.     

电控柴油机的在线失火诊断策略研究

为了满足日益严格的排放法规，电控发动机均要求装备OBD(在线诊断)系统。而在线的失火诊断则是电控柴油机故障诊断项目中的一个重要内容。为此采用曲轴的瞬时角加速度对发动机的失火故障进行监测，并制定了相应的诊断策略。实机试验表明，该失火诊断策略能实时有效地诊断出失火故障。     

一种频率可调时钟产生电路的研究

研究了一种用于微机械加速度计的CMOS时钟产生电路.该电路可以方便地实现片内时钟的精确产生,集成了具有高电源抑制比的基准电压源,振荡频率可根据需要调节.实际电路采用1.2 μm双层多晶硅、双层金属N阱CMOS工艺实现.在5 V电源电压、800 kHz振荡频率下,该电路功耗约为1.5 mW.     

Velocity spectra of fast ions produced by plasma of multiple lectron species

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CMOS RF switched capacitor bandpass filter tuned by ring VCO

A new RF switched capacitor bandpass filter and its command circuit made up of a ring voltage controlled oscillator with ‘XOR’ gates are proposed. Implemented in a standard CMOS technology, this circuit is intended to be used in a subset of professional mobile phone applications [380–520 MHz]. Experiments carried out on a prototype show a tunable center frequency range of 260 MHz [240–500 MHz], with a quality factor that can be as high as 300.     

Dynamic OADM Using Tunable Sampled Bragg Gratings Based on Vernier Effect

A novel dynamic optical add-drop multiplexer（OADM） scheme using tunable sampled fiber Bragg gratings（SFBG） by Vernier effect is firstly proposed. In this scheme, broad wavelength tuning range is achieved by only slightly adjusting the SFBG, the wavelength tuning of OADM will be faster than traditional dynamic OADM.     

新型大频差可调谐双频激光器

提出了一种新型大频差可调谐及双频激光器。利用LD端面泵浦Nd:YAG微片，将液体压强通过传递膜片加到晶体径向上，由于应力双折射效应，此微片激光器纵模发生分裂产生频差，理论分析和实验表明，此频差与施加的压强成正比关系，通过改变压强即可实现频差调谐。实验中获得了良好的频差与所加压强的线性调谐关系，并得到了约3.4GHz的巨大频差。     

An wide-range tunable on-chip radio-frequency LC-tank formed with a post-CMOS-compatible MEMS fabrication technique

An on-chip-micromachined tunable LC-tank, which consists of a metal inter-digitated variable capacitor and a metal solenoid inductor, is developed for wide-range radio-frequency (RF) tuning in multi-GHz band. A low-temperature metal MEMS process is developed to on-chip fabricate the passives. The process can be used for post-CMOS-compatible integration with RF ICs. Both the varactor and the inductor are suspended with a gap from the low-resistivity silicon wafer (i.e. standard CMOS wafer) for effectively depressing RF loss. The fabricated variable capacitor part, the inductor part and the whole tunable LC resonator are sequentially tested, finally resulting in a wide resonance-frequency tuning range of 72% (between about 3.5 and 6.0 GHz) under a low tuning voltage range of 0-4 V, while the Q-factor ranged within 23 and 8.