Ryoji Nishiumi

Bio: Ryoji Nishiumi is an academic researcher from Toyota. The author has contributed to research in topics: Internal combustion engine & Diesel engine. The author has an hindex of 4, co-authored 8 publications receiving 127 citations.

Effects of Cetane Number and Distillation Characteristics of Paraffinic Diesel Fuels on PM Emission from a DI Diesel Engine

Abstract: Fischer-Tropsch Diesel (FTD) fuel is expected to be a promising clean diesel fuel in the future because of its characteristics of zero sulfur, zero aromatics and a high cetane number. However, the optimum fuel properties for diesel engines have not been realized. In this study, the effects of cetane number and distillation characteristics on engine-out PM emissions from a conventional direct injection diesel engine were investigated by using paraffinic fuels which were made to simulate FTD fuel. From the results of the vehicle exhaust emissions test and engine dynamometer test, it was found that the narrow distillation characteristics (which eliminates heavy hydrocarbon fraction) could reduce the soluble organic fraction (SOF) in PM emissions, and the excess high cetane number characteristic promoted the formation of insoluble organic fraction (ISOF). It is considered that shorter ignition delay due to the excessively high cetane number results in poor mixing of injected fuel and air in the combustion chamber. Future diesel engines are expected to lower the compression ratio and to require the fuels with high cetane number. However, in the case of conventional diesel, the results showed that moderate high cetane number and narrow distillation properties eliminating the heavy hydrocarbon fraction were desirable as the optimum FTD fuel.

Fuel property determination apparatus for internal combustion engine

Abstract: An object of the present invention is to determine individually and accurately an ignitability index value and an evaporativity index value of a fuel. A fuel injection valve ( 12 ) for which a fuel injection direction is set such that fuel is directed toward a cylinder wall surface ( 54 ) is included. An air-fuel ratio (a first air-fuel ratio) of an exhaust gas and a crank angular velocity (a first crank angular velocity) during combustion associated with fuel injection at a first after injection timing T 1 are acquired. An air-fuel ratio (a second air-fuel ratio) of the exhaust gas and a crank angular velocity (a second crank angular velocity) during combustion associated with fuel injection at a second after injection timing T 2 that is retarded from the first after injection timing T 1 are acquired. A cetane number and a distillation property are determined based on Δ A/F that is an amount of change between the first air-fuel ratio and the second air-fuel ratio, Δ crank angular velocity that is an amount of change between the first crank angular velocity and the second crank angular velocity, and predetermined determination basic information.

Fuel property judgmental device for internal-combustion engine

Abstract: A fuel property judgmental device for an internal-combustion engine that makes accurate judgment of index values of the ignition property and evaporative property for the fuel individually. The fuel property judgmental device is provided with a fuel injection valve (12) the fuel injection direction of which is set up such that the fuel passes in the direction toward a cylinder wall surface (54). The judgmental device acquires an air/fuel ratio of exhaust gas (first air/fuel ratio) and a crank angular velocity (first crank angular velocity) at the time of combustion involved in the fuel injection during a first post-injection timing T1. Subsequently, the judgmental device acquires an air/fuel ratio of exhaust gas (second air/fuel ratio) and a crank angular velocity (second crank angular velocity) at the time of combustion involved in the fuel injection during a second post-injection timing T2 that is lagged in angle from the first post-injection timing T1. Finally, the judgmental device makes judgment of the cetane value and evaporative property in accordance with Δ A/F that is a variation in the first air/fuel ratio and the second air/fuel ratio, Δ crank angular velocity that is a variation in the first crank angular velocity and the second crank angular velocity, and the predefined basic judgmental information.

Partially pre-mixed auto-ignition of gasoline to attain low smoke and low NOx at high load in a compression ignition engine and comparison with a diesel fuel

Abstract: A Swedish MK1 diesel fuel and a European gasoline of ∼95 RON have been compared in a single cylinder CI engine operating at 1200 RPM with an intake pressure of 2 bar abs., intake temperature of 40° ...

Advantages of Fuels with High Resistance to Auto-ignition in Late-injection, Low-temperature, Compression Ignition Combustion

Abstract: Oxides of nitrogen (NOx) and smoke can be simultaneously reduced in compression ignition engines by getting combustion to occur at low temperatures and by delaying the heat release till after the ...