Your Selections

Machida, Masahiro
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

High Efficiency and Clean Diesel Combustion Concept using Double Premixed Combustion: D-SPIA

Toyota Industries Corporation-Hiroshi Kuzuyama, Masahiro Machida, Tsutomu Kawae, Takeshi Tanaka, Hideki Aoki, Yoshio Sugiyama, Tsutomu Umehara
Published 2012-04-16 by SAE International in United States
A new concept, Diesel Staggered Premixed Ignition with Accelerated oxidation (D-SPIA) was developed for lower exhaust emissions and carbon dioxide (CO₂) and this is based on divided fuel injection before top dead center (TDC). D-SPIA is a result of investigating various diesel combustion methods. Although the D-SPIA is a type of Premixed Charge Compression Ignition (PCCI), it has a distinct feature of double premixed combustion by optimum injection quantities and staggered timing, which can achieve an ideal heat release rate for low pollutant emissions and fuel consumption.Based on this concept, second injection timing and the proportion of the second fuel injection quantity play significant roles to reduce smoke, and hydrocarbon (HC) and carbon monoxide (CO) emissions. The second injection timing has a close relation to the premixed time of the second fuel injection and smoke level. The in-cylinder temperature at the second injection timing, which is related to the premixed time of the second fuel injection, is affected by the low-temperature heat release (LTHR) or the high-temperature heat release (HTHR) of the first fuel injection.…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

High Efficiency and Clean Diesel Combustion Using Double Premixed Ignition (First Report)~Development of a New Combustion Concept and Potential of Emission Reduction

Hiroshi Kuzuyama, Masahiro Machida, Tsutomu Kawae, Tsutomu Umehara
  • Technical Paper
  • 2011-08-0655
Published 2011-10-12 by Society of Automotive Engineers of Japan in Japan
It is very important and urgent subject that internal combustion engines have better combustion potential on clean and high efficiency performance for energy-saving future. We developed a new concept combustion for lower exhaust emission included CO₂, named Diesel Staggered Premixed Ignition with Accelerated Oxidation (D-SPIA), that is based on divided fuel injections before TDC. Although our D-SPIA belongs to a kind of PCCI (Premixed Charge Compression Ignition), it has a distinct feature of double premixed combustion by optimum injection quantities and staggered timing, which can achieve an ideal heat release rate for low pollutant emission and fuel consumption stably.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Study on Natural Gas-Fueled Homogeneous Charge Compression Ignition Engine (Second Report)

TOYOTA INDUSTRIES CORP.-Hiroshi Kazuyama, Masahiro Machida
Toyota Central R&D Labs., Inc.-Kazuhiro Akihama
  • Technical Paper
  • 2007-08-0414
Published 2007-10-01 by Society of Automotive Engineers of Japan in Japan
The combustion mode switching from SI to HCCI combustion is essential for practical use of the HCCI engine, especially, in the case of HCCI with internal EGR. The combustion mode switching was examined by cam profile switching from the valve overlap cam profile to the negative valve overlap cam profile. Finally, the combustion mode switching from SI to HCCI was demonstrated by switching the cam profile without any misfires and with an acceptable combustion noise level by controlling the throttle valve, fuel control valve, and exhaust valve closed timing, intake valve opening timing.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Study on Natural Gas Fueled Homogeneous Charge Compression Ignition Engine - Expanding the Operating Range and Combustion Mode Switching

Toyota Central R&D Labs., Inc.-Kazuhiro Akihama, Kazuhisa Inagaki, Matsuei Ueda
Toyota Industries Corporation-Hiroshi Kuzuyama, Masahiro Machida
Published 2007-04-16 by SAE International in United States
Natural gas homogeneous charge compression ignition (HCCI) engines require high compression ratios and intake air heating because of the high auto-ignition temperature of natural gas. In the first study, the natural gas fueled HCCI combustion with internal exhaust gas recirculation (EGR) was achieved without an intake air heater. The effects of the combustion chamber configuration, turbocharging, and external EGR were investigated for expanding the operating range. As a result, it was cleared that the combination of internal / external EGR and turbocharging is effective for expanding the HCCI operational range toward high loads. Meanwhile, the HCCI combustion characteristics at high engine speeds were unstable because of an insufficient reaction time for auto-ignition. Although the engine operation with a richer air-fuel ratio was effective for improving the combustion stability, the combustion noise (CN) was at an unacceptable level. Retarding of the ignition timing is effective for reducing the CN, however, misfires become a major problem. In the second study, from the results of CFD simulation, it was cleared that a local hot temperature spot promoted the…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Expanding the Operational Range of a Natural Gas-Fueled HCCI Engine by Controlling Internal/External EGR, and Charging Pressure

Toyota Central R&D Labs., Inc.-Kazuhiro Akihama
Toyota Industries Corp.-Hiroshi Kuzuyama, Masahiro Machida
  • Technical Paper
  • 2006-05-0255
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
A natural gas-fueled Homogeneous Charge Compression Ignition (HCCI) is attractive combustion technology that could provide high thermal efficiency and low NOx emissions. In general, the natural gas HCCI engine needs high compression ratios and intake air heating because of the high auto-ignition temperature of natural gas.In the first stage of this study, the basic characteristics of natural gas-fueled HCCI were investigated under various intake air temperatures by using an intake air heater. Although HCCI itself with the intake air heater showed high thermal efficiency and low NOx emissions, the actual efficiency of the engine system was lower than that of spark ignition combustion due to power consumption of the intake air heater. Internal exhaust gas recirculation (EGR) by a negative overlap cam profile was investigated as an alternative way of the intake air heater. As a result, HCCI combustion was achieved without the intake air heater and showed higher indicated thermal efficiency compared to a spark ignition combustion engine.Expanding the operating range of HCCI was attempted in the next step. The effects of combustion chamber…