`
`20°
`
`§‘
`
`7I
`
`SOI
`
`\
`
`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
`
`’/////////A
`
`
`
`
`
`Condition 18
`SOI is 80° BTDC
`EOI is 60° BTDC
`
`
`
`Condition 28
`SOI is 5° ATDC
`EOI is 25° ATDC
`
`FR = 70 mg» cy
`
`ycle
`
`
`
`
`
`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
`FR = 70 mg/cyl/cycl
`
`
`
`
`
`I
`:
`
`Condition 33
`SOI is 5° BTDC
`EOI is 15° ATDC
`
`
`
`90°
`75°
`60°
`45°
`30°
`15°
`0°
`15°
`30°
`45°
`60°
`90°‘75°
`+4 BTDC j-— TDC j—-- ATDC T9
`
`Crankangle
`
`Mass or raw C*;(?7”"°e°“‘D
`/xi.-lie/20/III/A'[__
`,
`I
`9 ""‘"““'"9""*‘---=
`
`7o
`
`I
`
`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).
`
`1/1
`
`EX. 2013(25)
`
`Ex. 2013(25) 1/1