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Tata Motors Limited is an Indian multinational automotive manufacturing company headquartered in Mumbai, Maharashtra, India and a subsidiary of the Tata Group. Its products include passenger cars, trucks, vans, coaches, buses, construction equipment and military vehicles. It is the world's 17th-largest motor vehicle manufacturing company, fourth-largest truck manufacturer, and second-largest bus manufacturer by volume.Tata Motors has auto manufacturing and assembly plants in Jamshedpur, Pantnagar, Lucknow, Sanand, Dharwad, and Pune in India, as well as in Argentina, South Africa, Thailand, and the United Kingdom. It has research and development centres in Pune, Jamshedpur, Lucknow, and Dharwad, India, and in South Korea, Spain, and the United Kingdom. Tata Motors' principal subsidiaries include the British premium car maker Jaguar Land Rover and the South Korean commercial vehicle manufactuer Tata Daewoo. Tata Motors has a bus-manufacturing joint venture with Marcopolo S.A. , a construction-equipment manufacturing joint venture with Hitachi , and a joint venture with Fiat which manufactures automotive components and Fiat and Tata branded vehicles.Founded in 1945 as a manufacturer of locomotives, the company manufactured its first commercial vehicle in 1954 in a collaboration with Daimler-Benz AG, which ended in 1969. Tata Motors entered the passenger vehicle market in 1991 with the launch of the Tata Sierra, becoming the first Indian manufacturer to achieve the capability of developing a competitive indigenous automobile. In 1998, Tata launched the first fully indigenous Indian passenger car, the Indica, and in 2008 launched the Tata Nano, the world's most affordable car. Tata Motors acquired the South Korean truck manufacturer Daewoo Commercial Vehicles Company in 2004 and purchased Jaguar Land Rover from Ford in 2008.Tata Motors is listed on the Bombay Stock Exchange, where it is a constituent of the BSE SENSEX index, the National Stock Exchange of India, and the New York Stock Exchange. Tata Motors is ranked 314th in the 2012 Fortune Global 500 ranking of the world's biggest corporations. Wikipedia.

Saravanan N.,Tata Motors | Nagarajan G.,Anna University
Applied Energy | Year: 2010

Automobiles are one of the major sources of air pollution in the environment. In addition CO2 emission, a product of complete combustion also has become a serious issue due to global warming effect. Hence the search for cleaner alternative fuels has become mandatory. Hydrogen is expected to be one of the most important fuels in the near future for solving the problems of air pollution and greenhouse gas problems (carbon dioxide), thereby protecting the environment. Hence in the present work, an experimental investigation has been carried out using hydrogen in the dual fuel mode in a Diesel engine system. In the study, a Diesel engine was converted into a dual fuel engine and hydrogen fuel was injected into the intake port while Diesel was injected directly inside the combustion chamber during the compression stroke. Diesel injected inside the combustion chamber will undergo combustion first which in-turn would ignite the hydrogen that will also assist the Diesel combustion. Using electronic control unit (ECU), the injection timings and injection durations were varied for hydrogen injection while for Diesel the injection timing was 23° crank angle (CA) before injection top dead centre (BITDC). Based on the performance, combustion and emission characteristics, the optimized injection timing was found to be 5° CA before gas exchange top dead centre (BGTDC) with injection duration of 30° CA for hydrogen Diesel dual fuel operation. The optimum hydrogen flow rate was found to be 7.5 lpm. Results indicate that the brake thermal efficiency in hydrogen Diesel dual fuel operation increases by 15% compared to Diesel fuel at 75% load. The NOX emissions were higher by 1-2% in dual fuel operation at full load compared to Diesel. Smoke emissions are lower in the entire load spectra due to the absence of carbon in hydrogen fuel. The carbon monoxide (CO), carbon dioxide (CO2) emissions were lesser in hydrogen Diesel dual fuel operation compared to Diesel. The use of hydrogen in the dual fuel mode in a Diesel engine improves the performance and reduces the exhaust emissions from the engine except for HC and NOX emissions. © 2010 Elsevier Ltd. All rights reserved.

Sinha R.K.,Tata Motors | Sensarma P.,Indian Institute of Technology Kanpur
Electric Power Systems Research | Year: 2011

This paper proposes a phase estimator based on a pre-filter based phase locked loop (PF-PLL), which overcomes serious limitations of existing PLL routines under frequency variation, distorted power grid conditions and measurement errors. This is achieved by a chain of pre-filters, which systematically attenuates all distortion components and extracts the fundamental, positive-sequence signal. The reported PF-PLL is capable of fast and precise phase estimation, even with unbalanced and highly distorted threephase electrical variables, which may be measured with low-cost transducers of reduced accuracy. Consequently, it is appropriate for control of all grid connected equipment, including the dynamic voltage restorer (DVR), where it is often required to synchronize with line currents, which experience much higher levels of harmonic distortion than voltages. This paper presents a detailed analysis of the PF-PLL, its evaluation through simulation and experiments, using a fixed-point DSP based laboratory prototype. © 2010 Elsevier B.V.

Jadon A.,Tata Motors
Indian Journal of Anaesthesia | Year: 2010

Any anaesthetic technique, either regional or general, has potential for complications. Moreover, it has been seen that in obstetric patients, the complications are potentiated due to pregnancyrelated changes in physiology and due to various other factors. Increasing trend of caesarean section in the setting of increasing maternal age, obesity and other concomitant diseases will continue to challenge the obstetric anaesthetist in his/her task of providing safe regional and general anaesthesia. This review has highlighted the possible complications of regional and general anaesthesia encountered during the obstetric anaesthesia practice.

Jadon A.,Tata Motors
Indian Journal of Anaesthesia | Year: 2014

Horner's syndrome is not rare during labour epidural analgesia or in pregnant patients receiving epidural anaesthesia for caesarean section as thought previously. It occurs due to blockade of sympathetic fibres supplying the eye and face area. Most of the times it is a benign and self-limiting condition; however, it may become a serious systemic manifestation. We present a case where patient had weakness of upper-limb and Horner's syndrome of same side with visual disturbances. These symptoms were transient and resolved spontaneously without any treatment.

Chacko S.,University of Warwick | Chacko S.,Tata Motors | Chung Y.M.,University of Warwick
Journal of Power Sources | Year: 2012

Time-dependent, thermal behaviour of a lithium-ion (Li-ion) polymer cell has been modelled for electric vehicle (EV) drive cycles with a view to developing an effective battery thermal management system. The fully coupled, three-dimensional transient electro-thermal model has been implemented based on a finite volume method. To support the numerical study, a high energy density Li-ion polymer pouch cell was tested in a climatic chamber for electric load cycles consisting of various charge and discharge rates, and a good agreement was found between the model predictions and the experimental data. The cell-level thermal behaviour under stressful conditions such as high power draw and high ambient temperature was predicted with the model. A significant temperature increase was observed in the stressful condition, corresponding to a repeated acceleration and deceleration, indicating that an effective battery thermal management system would be required to maintain the optimal cell performance and also to achieve a full battery lifesapn. © 2012 Elsevier B.V. All rights reserved.

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