Browsing by Author "Merfaq, Hemyar Ahmed Saleh"

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Automatic steering control mechanism using sensor
(Department of Technical and Vocational Education (TVE), Islamic University of Technology (IUT), 2013-11-15) Merfaq, Hemyar Ahmed Saleh; Aziz, Mohammed Abdul Musaed; Tes, Addurakeb Hussein
For use in an agricultural machine which is automatically steered by sensing along a row of plants, a component of the automatic steering system, namely, a comparator system is disclosed herein which utilizes hydraulic signals from independent sensors and mechanically Compares such signals with each other and with a mechanical feedback responsive to the degree of angularity of the steered wheels of the vehicle. The net result of the combination and construction of the comparator system is to provide automatic steering control for a small variation of steering of left and right steering courses, for example 2 to 5 degrees, wherein any large amount of deflection of the steering wheels that may be caused by the vehicle operator taking Over the steering function will not affect the automatic operation of the comparator mechanism or will the comparator mechanism have any response thereto? Further the hydraulic system of the comparator sensors which "feel" the presence of corn stalks or vines ahead of the vehicle is hydraulically isolated from the hydraulic circuitry of the comparator interior. The invention is susceptible for use for directory guidance by a single row of plants, for example corn stalks, or by guidance between directories, e.g., parallel rows of plants. Due to the fact that two sensors are utilized which function independently of each Other should interruption of the directory, for example, a row of corn stalks, occur due to a cross path, there would be no sudden sharp steering deflection and the vehicle would continue in straight steering.
Automotive Hybrid Vehicle System or Hybrid Automobile
(Department of Mechanical and Production Engineering (MPE),Islamic University of Technology(IUT), Board Bazar, Gazipur, Bangladesh, 2012-11-15) Merfaq, Hemyar Ahmed Saleh; Yusuf, Abdulmalik Muhammad
An increasingly diverse set of hybrid-electric vehicles (HEVs) is now available in North America. The recent generation of HEVs have higher fuel consumption, are heavier, and are significantly more powerful than the first generation of HEVs. We compare HEVs for sale in the United States in 2007 to equivalent conventional vehicles and determine how vehicle weight and system power affects fuel consumption within each vehicle set. We find that heavier and more powerful hybrid-electric vehicles are eroding the fuel consumption benefit of this technology. Nonetheless, the weight penalty for fuel consumption in HEVs is significantly lower than in equivalent conventional internal combustion engine vehicles (ICEVs). A 100 kg change in vehicle weight increases fuel consumption by 0.7 l/100 km in ICEVs compared with 0.4 l/100 km in HEVs. When the HEVs are compared with their ICEV counterparts in an equivalence model that differentiates between cars and sports-utility vehicles, the average fuel consumption benefit was 2.7 l/100 km. This analysis further reveals that a HEV which is 100 kg heavier than an identical ICEV would have a fuel consumption penalty of 0.15 l/100 km. Likewise, an increase in the HEV's power by 10 kW results in a fuel consumption penalty of 0.27 l/100 km.