Ryoji Kihara

Bio: Ryoji Kihara is an academic researcher from Waseda University. The author has contributed to research in topics: Combustion & Diesel engine. The author has an hindex of 5, co-authored 17 publications receiving 224 citations. Previous affiliations of Ryoji Kihara include Isuzu Motors.

The advantages of the Isuzu square combustion chamber for D.I. engines

Abstract: An appropriate configuration of square cavities shows two distinct characteristics when compared with the characteristics of the circular cavity. One is that the injection angle to the square cavity wall has some effect on reducing smoke level at low engine speeds and loses this effect with increasing engine speed. Secondly, the reduction in swirl at high engine speeds results in a better balance of swirl over the entire engine operating range. This allows best injection timing for BMEP to be retarded resulting in lower NOx and noise.

Development Status of a Small, Direct-Injection Diesel Engine at Isuzu

Abstract: Development status of small direct injection diesel engine at Isuzu Motors Ltd. is reviewed. There is much difficulty in combustion optimization of small DI engines, due to small combustion chamber volume, large surface to volume ratio, wide engine speed range and so on. Novel ideas in the area of injection system, combustion chamber and induction swirl were tried to solve these problems and their effects are presented here. Our prototype DI engines which adopted some of these ideas has turned out to have better fuel economy by about 15 percent, 2 - 3 dB(A) higher noise level than IDI and almost the same power output performance as IDI. As to exhaust emissions, they have a possibility to conform to '86 California emission standards, in inertia weight classes up to 2625 LBS. The remaining problem areas are noise emission, durability of injection pump and cabin heater performance. These problems must be solved by further innovation, before DI engines will be successful in passenger car application.

Internal combustion engine with supercharger

Abstract: PURPOSE: To permit high output to be obtained and also improve the combustion and output by using an inexpensive supercharger, which is simple in construction and acts like an air pump on the basis of a new sucking system CONSTITUTION: An intake port 2a and a supercharger port 2b are provided independently of each other in a cylinder head 1, and a supercharger 20 is connected to the supercharger port 2b via a supercharger tube 3b The supercharger 20 is constructed as a vane type air pump rotated with the rotation of a crankshaft 11 through a transmission unit 13 It compresses air with-drawn from an intake port 22 and forces through a discharge port 23, the supercharger tube 3b and an air tank 14 to the port 2b An on-off valve 4b for the supercharger port 2b starts to be opened in the second half of the opening period of an off-off valve 4a for the intake port 2a Also, the angle made between the line A of flow of air entering the cylinder 2a through the intake port 2a and the axis X of the cylinder is made smaller than that of the flow line B on the sice of the supercharger port 2b COPYRIGHT: (C)1980,JPO&Japio

Combustion in Gas Fueled Compression: Ignition Engines of the Dual Fuel Type

Abstract: In the dual fuel engine much of the energy release comes from the combustion of the gaseous fuel white only a small amount of diesel liquid fuel provides ignition through timed cylinder injection. Such operation with optimum conversion methods has the potential to provide operational characteristics that are comparable or superior to those of the corresponding diesel or spark ignition engines. There characteristics may be realized only if sufficiently effective measures can be ensured both for the avoidance of knock, usually at high loads, and incomplete gaseous fuel utilization at relatively light loads. An objective of this contribution is to demonstrate that the main effort needed to overcome the problems associated with the operation of gas fueled dual fuel engines is via a better control of the relatively complex processes of combustion. Both experimental and analytical modeling procedures for effecting optimum improvement to the combustion process are described.