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Biogas is one of the most promising alternatives fuel for the future. Biogas, when used in automotive field, will help to bring down harmful emissions. However, some technical improvements are still needed, especially in the Indian automotive sector. In this research work 100% biogas operated two wheeler four stroke SI engine has been tested for exhaust gas emissions. The result shows the lower emissions than the existing petrol engine limits without exhaust gas after treatment. The current work clearly indicates the breakdown of compression ratio barrier and it is shown that the engine runs smoothly at compression ratio of 11:1 without any tendency of auto-ignition. Experiments were conducted by varying compression ratios from 9:1 to 11:1 and retaining the combustion chamber design. This study shows that using biogas in SI engines, it is particularly beneficial to reach interesting conversion efficiencies with low emissions.

In this experimental study four stroke, four cylinder, MPFI, SI engines were tested as per IS 14599. A group of six bifuel engines with different specifications was tested in gasoline mode and LPG mode. Engines were converted by using modification system to operate in LPG mode. Objective of this experimental study was to compare performance and emissions of PFI passenger car engines in gasoline mode and LPG mode and to establish generic performance trend for LPG/Gasoline bifuel engines by defining and computing normalized figure of merit, power per unit displacement. From experimental results, generic performance trend for passenger car engines was established. A unit parameter KW/lit was calculated for each engine for comparison in relation to rated torque, maximum exhaust gas temperature and speeds corresponding to maximum torque and maximum power.

The ever-increasing energy demand is a prime concern of entire world. As gasoline prices soar and concern over harmful emissions mount, vehicles which run on alternate fuel sources like LPG and CNG are becoming increasingly important. In this experimental study single cylinder pickup van engine was tested as per IS 14599 by using LPG and CNG as fuel. Ordinary fuel for vehicle is gasoline. Full throttle performance was tested at different speeds on computerized engine test set up with data acquisition system and AVL eddy current dynamometer. Important performance characteristic curves have been investigated and compared in CNG mode and LPG mode. Curve fitting has been done and equations with regression coefficient have been derived. Statistical analysis for different engine parameters has been done in LPG and CNG mode by using matlab software. It was observed that maximum power and maximum torque in LPG mode was more than that in CNG mode.

This paper discusses experimental outcome of port fuel injected engines operated on gasoline mode and LPG mode. Eight Passenger car PFI engines were tested by using computerized engine data acquisition and control system on gasoline mode and LPG mode. Objectives of this experimental study were 1) To establish generic performance trend for group of newly introduced gasoline/LPG passenger car bi-fuel engines in Indian market. This trend has been established. 2) To compare performance of one sample engine in gasoline and LPG mode. This performance has been compared from performance characteristics curves in both modes. 3) To establish methodology to compare and contrast the performance of various types of Gasoline/LPG passenger car engines. This methodology has been established for a group of engines. 4) To define new normalized figure of merit suitable for the performance comparison of passenger car engines. A parameter power per unit displacement has been defined.

The world is facing a twin crisis of environmental degradation and fossil fuel depletion. Alternative fuels are seems to be a promising solution for low exhaust emissions. Liquefied Petroleum Gas (LPG) is a prominent alternative fuel with well developed distributed infrastructure and increasing number of Gasoline engines are now being converted to run on LPG considering the fuel economy and low exhaust emissions. This paper describes the bi-fuel (LPG/Gasoline) concept on a single cylinder engine. Air cooled Direct Injection (DI) diesel engine converted to operate on gasoline engine with electronic ignition system and it is having feature to change the spark ignition timing w.r.t. speed. The compression ratio was also reduced suitable to SI operation. CFD analysis was performed to review and subsequently to increase the cooling capacity of the engine.

The rising demand for cleaner vehicles considering the upcoming stringent emission norms like Euro-IV has promoted development of CNG vehicles. The need for expensive after treatment technologies has imposed constraints on Euro-IV Gasoline and Diesel engine development. On the contrary CNG engines have easily met Euro-III norms with Carburetion technology and Euro-IV and beyond norms with Injection technology. CNG has proved to be a clean and environmentally friendly fuel, significantly improving the ambient air quality of cities. The addition of Hydrogen to CNG has potential to even lower the CNG emissions and is considered to be the first step towards promotion of a Hydrogen economy. Worldwide experts have described Hydrogen as the cleanliest fuel for IC Engines [1, 2 and 3]. Hythane is the patented blend of 15% of Hydrogen in CNG by Energy content. HCNG is the blend of Hydrogen and CNG in varying proportions.