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9436107 Study of a two-cycle uniflow spark-ignition engine
96
Abstracts It)t)4 ,/SAE Autumn ('om ention /,ISAE Rel'iew 16 (199,5) 95-113
combustion chamber near compression TDC can be increased by later closing timing of intake valves in the case of strong vertical vortex because the vertical vortex is enhanced by the back floe, from the cylinder to the intake ports. 9436053 Technology of a New 1.5-1iter Lean Burn Engine Noriaki Mitobe, Misao Fujimoto, Tomohisa Fujikawa, Isao Shimizu, Yasuo Honda, Akihito Nagao (Mazda Motor Corporation), pp. 25-28. 12 figs.. 3 tables, 4 refs. We have developed a NEW I.SL 4valve DOHC Lean Burn Engine. Torqueful load performance and efficient low NOx combustion have been realized by newly adopted technology such as Independent Straight Port with Tumble Swirl Control Valve, Lens-shaped Combustion Chamber, and Air Mixture type Injector. In addition, due to a new three-v,a'~ catalyst lean operation range has bccn enlarged to achieve substantial improvement of fuel economy.
Development of a Stratified Charge and Stable Combustion Method in Direct Injection Gasoline Engines Seiko Kono. 9436062
Masayuki Matuoka (Mazda Motor ('orporation), pp. 29-32, 9 figs., 2 tables, 5 refs. In order to be compatible a fucl economy as well as a diesel engine and a power as well as a gasoline engine, a stratified charge and stable combustion method has been developed. Our DISC engine has a high pressure and electromagnetic valve type fuel injection device and a mechanical superchager. The goal has been achieved, and effects of a heavy EGR on reduction of NOx and HC have been cleared.
The Study about a New Type Engine with a Spring of air and a Two-staged Combustion Huai-dong Ding Eiichi Goto (The 9436071
Institute of Physical and Chemical Research), pp. 33-36, 8 figs., 6 tables. 6 refs. In order to realize the low environment pollution and high efficicnc~ of the engine of automobile, locomotive, and ship. the methods of the air spring and the two staged combustion are studied. Combustion tempera ture and pressure can be lowered without lowering the efficiency, so the generation of NOx is reduced and noise level is lowered. It is expected to bring a big improvement on existing engines. 9436080 A STudy of Influence of Intermediate Combustion Products on Knocking Yasuhirn Tosaka (Nihon University Graduate School), Hideo Shoji, Atsushi Saima (Nihon University), pp. 37-4(t. figs., 1 table, 2 refs. This study investigated the behavior of the OH (characteristic spectrum of 306.4 nm), CH (431.5 nml and (7, (516.5 nm) radicals that are intermediate products of combustion and preflame reactions. Spectroscopic measurements were made of the absorption behavior of the radicals in the end and center zones of the combustion chamber of a spark ignition engine. Two types of test fuels were used, iso-octane (10l) RONI and n-heptane (0 RON). The results showed that the behavior of the OH. CH and C, radicals in preflame reactions differed depending on the octane number of the fuels and between normal and abnormal combustion conditions. 9436107 Study of a two-cycle uniflow spark-ignition engine Masakazu Okai (Tamagawa University) Michikata Kono (University of Tokyo), Hisasi Inaga (LEMA) Seiichiro Kumagai (Noritz Corp.), pp. 41-44, 8 figs., 1 table, 4 rcfs. For the purpose of reducing specific fucl consumption and exhaust emissions of two cycle spark-ignition engines, an experimental single-cylinder engine was constructed, which is provided with an overhead poppel valve for exhaust and reed valves for air-head scavenging. In the present paper is reported the effect of air-head uniflow scavenging in comparison with the Schniirle on reducing specific fuel consumption and exhausl emissions of two cycle spark-ignition engine
9436116 Development of Y.C.L.S. (Yamaha Computerized Lubrication System) Reduction Methods for Exhaust Smoke on 2-Stroke Gasoline Engine Yoshinobu Yashiro, Kunio Takahasi (YAMAHA MOTOR CO., LTD.), pp. 45-48, 6 figs., 5 tables, 2 refs. The Lubrication system generally used on 2-stroke engines has been a separate lubrication system. A drawback inherence in this system was excessive oil is returned to an oil tank and reused has been developed. This system makes it possible to improve greatly 2-strokes engines with respect to oil consumption, exhaust smoke, carbon clogging in muffler and oil scattering from muffler. 9436125 Cold Startability in a CNG 2 Stroke Spark Ignition Engine Yoshiaki Shimizu, Tadamasa Maeda, Akinori Honda, Manabu Kobayashi (SUZUKI Motor Corporation), pp. 49-52, 7 figs., 4 tables, 1 ref. In making of Compressed Natural Gas vehicle for practical use, improvement of initial cost, weight, driving range and infrastructure arc required. In our development of CNG 2 stroke spark ignition engine, power loss, cold startability and lack of durability were additional engineering problems. In this report, we address our countermeasurement to those problems and evaluation results. We could significantly increase the power by changing gasoline engine carburetor to gas mixer and elimination of fixed venturi. Lubrication oil improvement could resolve cold startability problem unique to 2 stroke CNG engine.
9436134 Noise and Vibration Reduction Techniques Adopted for the New V6 Twin-Cam VQ Engine Tatsuo Yamazaki, Ryouichi Maeda, Kikuo Yamashita (Nissan Motor CO., LTD), pp. 53-56, 14 figs., 2 tables, 8 refs. One of the most important issues thai must be addressed in developing a new engine is to meet today's conflicting requirements for light weight and lower noise and vibration. To obtain a comp-act, lightweight design for the new V6 VQ engine, an aluminum cylinder block and a crankshaft with smaller crankpins were adopted. This paper describes the effects of an aluminum cylinder block and smaller crankpins on the noise and vibration characteristics of a lightweight engine, and presents the key technologies incorporated in the new VQ engine to reduce noise and ~,ihration.
9436143 Identification of Engine Noise Source Using Acoustic Double Holography Method Mitsun Nakano (Isuzu Advanced Engineering Center), Masao Nagamatsu (Tokyo Metropolitan University Graduate School). Kohei Suzuki, Takuya Yoshimura (Tokyo Metropolitan University), pp. 57-60, 12 figs., 2 refs. The acoustic double holography method which uses sound pressure data measured on the dual measuring planes is proposed. Several advantages of this method over the conventional holography method were proved through computer simulations and experiments. Furthermore, results of the noise source identification using this method on a diesel engine operated are reported. 9436152 Study on the Reduction of Air Induction Noise Katsuyuki Tanaka, Hidco Kamo, Yoshitaka Nishio, Yasutoshi Kameda, Kouji Ohara, Naoya Kato, (Nippondenso Co., Ltd.), (Nippon Soken, Inc.), pp. 61-64, 11 figs., 1 ref. An induction system evaluating apparatus which enables us to work on the reduction of induction noise from the early stage of engine development has been developed. With this apparatus, an induction system developing method which realizes both of induction noise reduction and engine performance improvement has been established. Additionally, we introduce an active silencer which can freely control induction noise. This silencer comprises an actuator which attached to the induction system.
9436161 Sources
Reduction of Intake Pulsation Noise by Reducing Noise
Satoshi Kimura, Taichiro Yokoyama (Nissan Motor Co., LTD), pp. ~5-68, 8 figs., 2 tables, 6 rcfs.
Abstracts It)t)4 ,/SAE Autumn ('om ention /,ISAE Rel'iew 16 (199,5) 95-113
combustion chamber near compression TDC can be increased by later closing timing of intake valves in the case of strong vertical vortex because the vertical vortex is enhanced by the back floe, from the cylinder to the intake ports. 9436053 Technology of a New 1.5-1iter Lean Burn Engine Noriaki Mitobe, Misao Fujimoto, Tomohisa Fujikawa, Isao Shimizu, Yasuo Honda, Akihito Nagao (Mazda Motor Corporation), pp. 25-28. 12 figs.. 3 tables, 4 refs. We have developed a NEW I.SL 4valve DOHC Lean Burn Engine. Torqueful load performance and efficient low NOx combustion have been realized by newly adopted technology such as Independent Straight Port with Tumble Swirl Control Valve, Lens-shaped Combustion Chamber, and Air Mixture type Injector. In addition, due to a new three-v,a'~ catalyst lean operation range has bccn enlarged to achieve substantial improvement of fuel economy.
Development of a Stratified Charge and Stable Combustion Method in Direct Injection Gasoline Engines Seiko Kono. 9436062
Masayuki Matuoka (Mazda Motor ('orporation), pp. 29-32, 9 figs., 2 tables, 5 refs. In order to be compatible a fucl economy as well as a diesel engine and a power as well as a gasoline engine, a stratified charge and stable combustion method has been developed. Our DISC engine has a high pressure and electromagnetic valve type fuel injection device and a mechanical superchager. The goal has been achieved, and effects of a heavy EGR on reduction of NOx and HC have been cleared.
The Study about a New Type Engine with a Spring of air and a Two-staged Combustion Huai-dong Ding Eiichi Goto (The 9436071
Institute of Physical and Chemical Research), pp. 33-36, 8 figs., 6 tables. 6 refs. In order to realize the low environment pollution and high efficicnc~ of the engine of automobile, locomotive, and ship. the methods of the air spring and the two staged combustion are studied. Combustion tempera ture and pressure can be lowered without lowering the efficiency, so the generation of NOx is reduced and noise level is lowered. It is expected to bring a big improvement on existing engines. 9436080 A STudy of Influence of Intermediate Combustion Products on Knocking Yasuhirn Tosaka (Nihon University Graduate School), Hideo Shoji, Atsushi Saima (Nihon University), pp. 37-4(t. figs., 1 table, 2 refs. This study investigated the behavior of the OH (characteristic spectrum of 306.4 nm), CH (431.5 nml and (7, (516.5 nm) radicals that are intermediate products of combustion and preflame reactions. Spectroscopic measurements were made of the absorption behavior of the radicals in the end and center zones of the combustion chamber of a spark ignition engine. Two types of test fuels were used, iso-octane (10l) RONI and n-heptane (0 RON). The results showed that the behavior of the OH. CH and C, radicals in preflame reactions differed depending on the octane number of the fuels and between normal and abnormal combustion conditions. 9436107 Study of a two-cycle uniflow spark-ignition engine Masakazu Okai (Tamagawa University) Michikata Kono (University of Tokyo), Hisasi Inaga (LEMA) Seiichiro Kumagai (Noritz Corp.), pp. 41-44, 8 figs., 1 table, 4 rcfs. For the purpose of reducing specific fucl consumption and exhaust emissions of two cycle spark-ignition engines, an experimental single-cylinder engine was constructed, which is provided with an overhead poppel valve for exhaust and reed valves for air-head scavenging. In the present paper is reported the effect of air-head uniflow scavenging in comparison with the Schniirle on reducing specific fuel consumption and exhausl emissions of two cycle spark-ignition engine
9436116 Development of Y.C.L.S. (Yamaha Computerized Lubrication System) Reduction Methods for Exhaust Smoke on 2-Stroke Gasoline Engine Yoshinobu Yashiro, Kunio Takahasi (YAMAHA MOTOR CO., LTD.), pp. 45-48, 6 figs., 5 tables, 2 refs. The Lubrication system generally used on 2-stroke engines has been a separate lubrication system. A drawback inherence in this system was excessive oil is returned to an oil tank and reused has been developed. This system makes it possible to improve greatly 2-strokes engines with respect to oil consumption, exhaust smoke, carbon clogging in muffler and oil scattering from muffler. 9436125 Cold Startability in a CNG 2 Stroke Spark Ignition Engine Yoshiaki Shimizu, Tadamasa Maeda, Akinori Honda, Manabu Kobayashi (SUZUKI Motor Corporation), pp. 49-52, 7 figs., 4 tables, 1 ref. In making of Compressed Natural Gas vehicle for practical use, improvement of initial cost, weight, driving range and infrastructure arc required. In our development of CNG 2 stroke spark ignition engine, power loss, cold startability and lack of durability were additional engineering problems. In this report, we address our countermeasurement to those problems and evaluation results. We could significantly increase the power by changing gasoline engine carburetor to gas mixer and elimination of fixed venturi. Lubrication oil improvement could resolve cold startability problem unique to 2 stroke CNG engine.
9436134 Noise and Vibration Reduction Techniques Adopted for the New V6 Twin-Cam VQ Engine Tatsuo Yamazaki, Ryouichi Maeda, Kikuo Yamashita (Nissan Motor CO., LTD), pp. 53-56, 14 figs., 2 tables, 8 refs. One of the most important issues thai must be addressed in developing a new engine is to meet today's conflicting requirements for light weight and lower noise and vibration. To obtain a comp-act, lightweight design for the new V6 VQ engine, an aluminum cylinder block and a crankshaft with smaller crankpins were adopted. This paper describes the effects of an aluminum cylinder block and smaller crankpins on the noise and vibration characteristics of a lightweight engine, and presents the key technologies incorporated in the new VQ engine to reduce noise and ~,ihration.
9436143 Identification of Engine Noise Source Using Acoustic Double Holography Method Mitsun Nakano (Isuzu Advanced Engineering Center), Masao Nagamatsu (Tokyo Metropolitan University Graduate School). Kohei Suzuki, Takuya Yoshimura (Tokyo Metropolitan University), pp. 57-60, 12 figs., 2 refs. The acoustic double holography method which uses sound pressure data measured on the dual measuring planes is proposed. Several advantages of this method over the conventional holography method were proved through computer simulations and experiments. Furthermore, results of the noise source identification using this method on a diesel engine operated are reported. 9436152 Study on the Reduction of Air Induction Noise Katsuyuki Tanaka, Hidco Kamo, Yoshitaka Nishio, Yasutoshi Kameda, Kouji Ohara, Naoya Kato, (Nippondenso Co., Ltd.), (Nippon Soken, Inc.), pp. 61-64, 11 figs., 1 ref. An induction system evaluating apparatus which enables us to work on the reduction of induction noise from the early stage of engine development has been developed. With this apparatus, an induction system developing method which realizes both of induction noise reduction and engine performance improvement has been established. Additionally, we introduce an active silencer which can freely control induction noise. This silencer comprises an actuator which attached to the induction system.
9436161 Sources
Reduction of Intake Pulsation Noise by Reducing Noise
Satoshi Kimura, Taichiro Yokoyama (Nissan Motor Co., LTD), pp. ~5-68, 8 figs., 2 tables, 6 rcfs.