Development of the Toyota lean combustion system

Book · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5775451

Matsushita, S; Inoue, T; Nakanishi, K; Kato, K; Kobayashi, N

The lean combustion of an SI engine has been recognized as one of the most promising methods for improvement of fuel economy. There has been difficulty in extending the lean misfire limit enough to realize NOx emission levels below the mandatory level and still keep satisfactory driveability. A simulation study has been carried out to do this. The lean misfire limit has been extended by the introduction of high swirl and high combustion chamber turbulence through the use of a helical port with an unique swirl control valve, a newly developed ZrO/sub 2/ lean mixture sensor and the multi-point fuel injection with sophisticated control. A very good fuel economy level of 17.0 km/1 has been accomplished while still meeting the NOx emmision cycle regulation of 0.25 g/km. The system and its components, the results of the simulation and experiments on the effects of each component are described.

• OSTI ID: 5775451
• Report Number(s): TP-850044
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMBUSTION CHAMBERS
COMBUSTION KINETICS
CONTROL EQUIPMENT
EMISSION
ENGINES
EQUIPMENT
EXHAUST GASES
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL ECONOMY
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
REACTION KINETICS
SIMULATION
SPARK IGNITION ENGINES
TRANSITION ELEMENT COMPOUNDS
TURBULENT FLOW
VALVES
VORTEX FLOW
WASTES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES