`(4%
`
`'%///////A
`
`* = Ignition
`
`77
`
`SOI
`
`I\
`
`EOI
`
`Start of Injection
`
`End of Injection
`
`Normal Fuelling Rate (FR) = 50 mg/cyl/cycle
`
`
`I
`|
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`|
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`
`
`Condition 1B
`SOI is 80° BTDC
`EOI is 60° BTDC
`
`
`
`
`FR = 70 mg/cyl/cycle
`
`
`
`Condition 2B
`SOI IS 5° ATDC
`EOI Is 25° ATDC
`
`FR = 70 mg/cyl/cycle
`
`Condition 3B
`SOI is 5° BTDC
`EOI is 15° ATDC
`
`FR = 70 mg/cyl/cycle
`
`I
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`1*
`
`I W
`
`I
`
`I*
`
`IIIIIIIIIII
`
`I
`
`90°
`
`75°
`
`60°
`
`45°
`
`30°
`
`15°
`
`0°
`
`15°
`
`30°
`
`45°
`
`60°
`
`75°
`
`90°
`
`F BTDC F TDC F ATDC F
`
`Crankangle
`
`Fuelling Rate
`(mg/cvl/cycle)
`
`so
`
`®‘I§§A
`
`———————————————————————————————————————————————— -«
`
`1. A method of operating an internal combustion engine comprising retarding the ignition of
`a gas/fuel mixture within at least one cylinder of the engine to after top dead centre (ATDC)
`in respect of the combustion cycle of said at least one cylinder of the engine and, while said
`ignition is so retarded, increasing the fuelling rate of said at least one cylinder to a level
`higher than that required when the engine is operating normally to thereby assist
`in
`increasing the exhaust gas temperature of the engine, the timing of the introduction of fuel
`into the at least one cylinder being maintained at before top dead centre (BTDC).
`
`Ex. 2o12(24)
`
`1/1
`
`
`
`Ex. 2012(24) 1/1