Refine Your Search




Search Results

Technical Paper

ZENITH: A Nano-Satellite for Atmospheric Monitoring

This paper describes the ZENITH Nano-Satellite cum planetary atmospheric entry vehicle, called CanSat, the first Nano-Satellite project that has been developed by Delhi Technological University (Formerly Delhi College of Engineering), India. The satellite will function for monitoring the concentrations of various gases in the atmosphere. For this, the satellite consists of arduino microcontroller interfaced with the various Micro-electromechanical system (MEMS) gas sensors for measuring the concentrations of various gases such as carbon dioxide, carbon monoxide, methane, nitrous oxides, ozone, etc. The data obtained from the CanSat will be transmitted to the ground station where all the data will be stored and also the locations will be stored using GPS sensor. The academic goal of this project is to recruit students to the field of space science and technology.
Technical Paper


This paper investigates the use of several zero-ozone depleting potential (zero-ODP) HFC refrigerants, including HFC-134a, HFC-227ca, HFC-227ea, HFC-236ea, HFC-236cb, HFC-236fa, HFC-245cb, and HFC-254cb, for centrifugal chiller applications. We took into account the thermodynamic properties of the refrigerant and aerodynamic characteristics of the impeller compression process in this evaluation.. For a given operating temperature lift, there are significant differences in the pressure ratio required by each refrigerant and this variation in pressure ratio directly affects compressor size, efficiency, and performance. A comparison of the HFC refrigerant candidates with CFC-114 shows that HFC-236ea, HFC-227ca and HFC-227ea are viable alternatives for centrifugal water chillers. HFC-236ea has properties closest to CFC-114, and will result in comparible performance, but will require a slightly larger impeller and a purge system.
Technical Paper

ZF 5-Speed Transmissions for Passenger Cars

With the introduction of the 5HP24 in early 1996, ZF has completed their product line for 5-speed transmissions. This transmission was especially developed for 8 cylinder engines and has achieved important improvements in fuel consumption, performance, comfort and reliability. This report shows, that 5-speed automatic transmissions result in a reduced fuel consumption, even in countries with speed limits. For example the 5HP24 incorporates the latest developments such as: converter wirth controlled slip clutch (CSC) measures to allow engine speed between 600 and 7200 rpm modern closed loop control shifting strategy performance improved Transmission Control Unit (TCU)
Technical Paper

ZF 6-Speed Automatic Transmission for Passenger Cars

With the introduction of the ZF “myTronic6” (6 HP 26) in 2001, the Division Car Driveline Technology of the ZF Friedrichshafen AG has developed and introduced a new 6 speed stepped automatic transmission for passenger cars. This paper describes the gear set concept, the mechanical design and specific functions of this transmission. The 6 HP 26 is part of the new 6- speed program which comprises 3 transmission types. It will replace the existing ZF 5 speed program completely within the next years.
Technical Paper

ZF EE Drive - Electric Drive System for Low-Floor Buses

The current environmental situation in urban areas is demanding new concepts of transportation and innovative vehicle designs. More environmentally-friendly means of transport represent an important feature in local public transport. Improvements in the environmental situation are to be achieved by increased transition from individual transport to public transport on the one hand, and by having more environmentally-friendly buses on the other. Electric drive, whether as diesel, hybrid or zero-emission drive, has a central role to play in this. This report gives a survey of their estimated technical characteristics and possible applications.
Technical Paper

ZF EcoLife - The latest Generation of Powershift Automatics for Transit Buses

The megatrends "reduction of emissions" and "fuel consumption reduction" play a predominant role in the development of powertrains. For transit buses this implies both the reduction of emissions and pollutions of the internal combustion engine, and, on the other hand, a further reduction of noise and brake dust. Also very important is the reduction of both fuel consumption and CO₂ emissions. For all these targets the actual developments on the engine side have led to great improvements in the last decades, but what can be mentioned for the other components of the powertrain, especially looking for transmissions? First of all the relevant trends for transit buses have to be considered: A large increase of the torque of the combustion engines during the last years has a big impact on the development of transmissions for buses.
Journal Article

ZF New 8-speed Automatic Transmission 8HP70 - Basic Design and Hybridization-

The world's first six-speed automatic transmission for passenger cars was introduced to the market by ZF in 2001. The 6HP-family is based on a Lepelletier planetary gear set. An advanced version of these transmissions was launched in 2006. The 2nd generation offers significantly improved customer-relevant features such as reduced fuel consumption, response time and shifting speed. With regard to the increasing requirements especially in reduction of CO2 emissions, a new eight-speed transmission is now under development. The main targets for this transmission family are a further significant reduction in fuel consumption and emissions, good driving performance and state of the art driving comfort. The paper describes the transmission 8HP70, the schematic, main features and major design components. Key figures like transmission weight and size, fuel efficiency benefits and driving performance are shown compared to the 6-speed transmission of the 2nd generation.
Technical Paper

ZF Retarder in Commercial Vehicles

This paper describes the ZF - Intarder, a wear-free vehicle brake for commercial vehicles. Qualities such as optimum weight saving, compactness, compatibility with all PTOs and no change in driveshaft length, are the results of a new development. Performance measurements demonstrate connection with engine cooling system. Field test measurements provide new information about frequency of use of various brake levels and electronic speed control. An evaluation of financial issues indicates advantages for operation.

ZF’s CES blitz underscores industry shifts

The Consumer Electronics Show has become a centerpiece for advanced automotive technologies, highlighting the huge industry transition driven connectivity and convenience. Partnerships are now a central part of strategic plans, as are forays into new segments into the digital world.