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A four-dimensional interaction-based appraisal approach towards the performance enhancement of a vehicular waste heat recovery system

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Science China(Technological Sciences) 2022年第12期65卷 2921-2941页

作者： LU BoWen SHI LingFeng TIAN Hua WANG Xuan ZHANG MeiYan SHU GeQun Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Engines Tianjin UniversityTianjin 300072China

The non-linear multifactorial impacts on fuel-saving potential constrain the practical performance of the vehicular waste heat recovery system(WHRS). This study proposed a four-dimensional interaction-based appraisal approach to interpreting these impacts for enhancing WHRS's in-vehicle performance. The interaction incorporates a heat exchanger, configuration, engine,and vehicle. The proposed approach comprises two successive steps, emphasizing evaluation under the rated(Step 1) and off-design(Step 2) heat source conditions. A case study of waste heat recovery from a passenger vehicle was conducted to evaluate the in-vehicle performance of a novel co-split system and two single-split ones(with/without a regenerator) through this approach. The novel system theoretically modifies vehicular performance but remains ambiguous concerning real-world behaviour, which is assessed and verified by the proposed approach. Two key factors determining vehicular performance were identified by Step 1, namely, net power output and engine backpressure. As the co-split system modified both factors, its fuel-saving potential could be increased by up to 20.3% compared with single-split systems. Also, the limiting factor for off-design performance was pinpointed by Step 2, namely, the mismatch between the heat source and working fluid, which led to the solution, i.e., the synergistic split regulation of the working fluid and heat source. An up to 8.8% improvement in net power output was achieved by the co-split system at off-design heat sources compared with fixed split ratios. Consequently, the approach enables holistic performance improvement of the vehicular WHRS under design/off-design heat source conditions.

关键词： waste heat recovery passenger vehicle in-vehicle scenario dual heat source operational flexibility

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Replacing urban trucks via ground-air cooperation

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Communications in Transportation Research 2022年第1期2卷 344-350页

作者： Xiaobo Qu Ziling Zeng Kai Wang Shuaian Wang State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing100084China Department of Logistics&Maritime Studies The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

The advent of drones is leading to a paradigm shift in courier services,while their large-scale deployment is confined by a limited ***,we design a low-cost product that allows drones to drop parcels onto and pick them up from the roofs of moving passenger *** this,we propose a ground-air cooperation(GAC)based business model for parcel delivery in an urban *** per our case study using real-world data in Beijing,the new business model will not only shorten the parcel delivery time by 86.5% with a comparable cost,but also reduce road traffic by 8.6%,leading to an annual social benefit of 6.67 billion USD for *** proposed model utilizes the currently“wasted or unused”rooftops of passenger vehicles and has the potential to replace most parcel trucks and trailers,thus fundamentally addressing the congestion,noise,pollution,and road wear and tear problems caused by trucks,and bringing in immense social benefit.

关键词： Ground-air cooperation Drone Parcel delivery Urban truck passenger vehicle Roof rack

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China’s Dual Credit for passenger vehicles in Policy and Practice

China’s Dual Credit for Passenger Vehicles in Policy and Pr...

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作者： Jia-cai LI Shantou University

The dual-credit policy for passenger vehicles in China is a major policy innovation by China. It is based on corporate fuel consumption standard（CAFC） and new energy vehicle（NEV） credit standard and is an effective means to implement the two standards. It gives companies flexibility to comply with fuel-efficient standards for passenger cars, facilitating government enforcement and helping China’s passenger cars become low-carbon.

关键词： Dual credit CAFC credit NEV credit passenger vehicle

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Development of a Mobile Sensing Unit and Its Prototype Implementation

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Tsinghua Science and Technology 2008年第S1期13卷 223-227页

作者： Yusuke Mizuno Yozo Fujino Keita Kataoka Yoshihiro Matsumoto Research Center for Environmental Safety Yamaguchi University Department of Civil Engineering The University of Tokyo Research and Development Center East Japan Railway Company Kansai Electric Power Co. Inc.

This paper represents a design and development of a mobile sensing unit as well as its prototype implementation for railway track monitoring. The unit consists of an ultra-small personal computer (PC), a global positioning system (GPS) receiver, an accelerometer and an ADC (Analog/Digital Converter) so that the unit can trace the route while capturing an acceleration response of a passenger vehicle. The unit enables more frequent and qualitative data acquisition compared with traditional and the state of the practice railway track inspection equipments. Locating disorder is the key of our unit, which has a reasonable accuracy of positioning with GPS data, existing facilities landmarks, and car acceleration responses. The proposed unit is a promising device for efficient properties management of railway agencies. The prototype implementation shows a result that car acceleration responses are related with the track displacements in low frequencies. The results also imply that sensor settlement on a vehicle floor, not axes or bogies, is effective for capturing track vertical displacements.

关键词： mobile sensing railway track monitoring instrumentation data acquisition passenger vehicle global positioning system (GPS)

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