A Research on Lean Combustion Control of Prechamber-type Stratified-Charge SI Automobile Engine with Low Nox/Fuel Consumption

Haruo Ukawa

doi:10.4271/2001-01-1337

2001-03-05

A Research on Lean Combustion Control of Prechamber-type Stratified-Charge SI Automobile Engine with Low Nox/Fuel Consumption 2001-01-1337

This paper analyzes quantitatively mechanisms and its effects of reducing simultaneously NO_x/fuel-consumption taking the focus on torch-jet lean combustion control modeling in a pre-chamber type stratified-charge approach with actual Honda CVCC engine test examples.

For analyzing the NO _x /fuel consumption reduction mechanism and effects, so-called phenomenological modeling centering around torch-flame-jet behavior are examined with varying the design factors such as auxiliary chamber volume/torch nozzle area.

Then, main physical features and those characteristics of torch-flame-jet such as the combustion pressure rise histories in pre-chamber, penetration length/volume/speed of torch-jet in lean mixture of main chamber, lean mixture shear-flow entrainment and turbulence enhancing effects induced by torch-jet are computed with numerical methods and those various effects for the lean ignition/combustion are examined.

Finally, verifications are attempted by comparison with real engine tested results which specific CO/HC/NOx, fuel-consumption in[gr/PS_i-hr] are measured with varying design factors such as pre-chamber volume/torch nozzle area, and trends coincidence are verified sufficiently with computational results.

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A Research on Lean Combustion Control of Prechamber-type Stratified-Charge SI Automobile Engine with Low Nox/Fuel Consumption 2001-01-1337

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