Transonic CombustionTM - Injection Strategy Development for Supercritical Gasoline Injection-Ignition in a Light Duty Engine

Chris de Boer Shizuo Sasaki Shreeram Shetty Gary Bonar

Oct 16, 2012

Poster Location: P-08

Transonic Combustion, Inc. 461 Calle San Pablo, Camarillo, CA, 93012 805.465.5100 chris.deboer@tscombustion.com

Rapid Mixture Formation High Mixture Temperature

Liquid Supercritical

Time=0.55 ms

Time=0.71 ms

Pressure=30bar Temp.=598⁰C Time=0.25 ms

Supercritical Injection Pressure – 200 to 300 bar Temperature - 320⁰C

Supercritical Gasoline Injection: TSCi™ POSTER LOCATION P-08 Knock Free Compression Ignition

CI+ diffusive combustion with late injection

Low combustion noise with pilot injection - dP/dθ<8bar/deg

Low smoke with supercritical fuel - <0.4 FSN

Low ISFC ≈190g/kwh

Low Particulate Spark Ignition Single Cylinder Engine φ 86 x 86, Comp. Ratio = 10.7:1, (λ=1)

Reduced PM and PN in direct injection homogeneous combustion PM : up to 61% PN : 47 to 98%

Reduced engine-out HC and fuel consumption HC : up to 45% BSFC : up to 4%

Supercritical fuel injection improves mixture formation for SIDI

0.0000.0200.0400.0600.0800.100

PM [g

/kw

h] Supercritical

Liquid

rpm 2000 1800 1500 2000 1500 BMEP [bar] 2.0 4.5 6.5 10.0 10.0

1.00E+10

1.00E+12

1.00E+14

PN [#

/kw

h]

020406080100

PN R

educ

tion

[%]

-50

0

50

100

150

200

-40 -20 0 20 40 60 80

Inj e

ctio

n Co

mm

and

[v]

P [b

ar],

dQ

/dθ

[J/de

g.]

Crank Angle [deg.ATDC]

1800rpm,≈ 15.2 bar IMEP

Fuel Press = 300 barFuel Temp = 320⁰CBoost Press = 250 kPaEx. Press= 260 kPaEGR = 0Regular gasoline

(PON 87)

0

2

4

6

160

180

200

220

-14 -12 -10 -8 -6 -4

Smok

e [F

SN]

ISFC

[g/k

wh]

Main Injection timing [deg.ATDC]

ISFC

Single Cylinder Engineφ 75 x 88.3, Comp. Ratio = 13.5:1

PdQ/dθ

Fuel Injection0

5

10