Design of New Ecological Combustion Engine with Double Potential Power Output

Abstract

Internal combustion engine popularity has been won commercially by the four-stroke type engine surpassing the two-stroke and rotary wankel engines in the world market places. Commercial engines both gasoline and diesel fuels are mostly using the four-stroke principle and even the hybrid cars still rely on this type of engine as their backup source of power. Current research in this areas are optimizing the effectiveness of the four-stroke combustion engine related to fuel consumption, fuel-air mixture, reuse of exhaust energy to feed air inflow, fuel control system to feed exact volume of fuel, exact firing time using intelligent control unit and lower hydrocarbon emissions. However, the development in the engine power output generation is limited due to nearly satisfied expectation of the automotive users caused by limited road development; meanwhile, the short range aerospace engine technology has limited attention in the advanced countries but certainly not in the archipelago country such as Indonesia. This paper is classified to initiates first publication from series of research log book on a new engine design that promotes double power output principle called Double Power Ecological Engine (DPE) for power drive vehicles. The design of DPE engine is located in the firing order, which has direct influence to the new design configuration of crank shaft, air inlet, exhaust and the piston head geometry. The ultimate design of this combustion engine is secured under the firing orders, which are made to secure power output twice as much as it is in the four-stroke engine so that double potential power engine is promoted under ecological fuel ethanol. The design of DPE engine of this research is expected to generate 280 kW power output based on the 1.4 liter engine, which commercially generate around 141 kW. Further research will show the effectiveness of the DPE engine design leading to commercial application.

Development of Two Stroke Double Power Ecological Engine with Spark Assisted Compression Ignition in Lean Mixture

“…Then, by increasing compression ratio to 12, and thermal efficiency 40%, the power will reach 295.63 kW, higher than the original design which could reach up to 280,21 kW (Harianton, et al, 2014). The development has changed the piston diameter to 72 mm and the length of stroke 85.96 mm.…”

“…To make calculation of the air requirement for stoichiometric air fuel mixture λ=1, then 14.5 kg air for 1 kg fuel. The top speed of 6,000 rpm, will require 0.005 kg fuel injected (Harianton, et al, 2014) Area of the valve opening:…”

“…It is a new configuration of two-stroke engine designed to promote firing in every engine rotation (Harianton, et al, 2014), which theoretically promotes double power output compared to the most common four-stroke engine available commercially. However, due to frequent combustion, this DPE engine is expected to generate higher engine temperature so that it requires special outer shape geometry and scavenging process inside the combustion chamber to let larger air flow contact suitable for rapid power generation such as racing engine or for airplane application.…”