To provide an exhaust emission control device of an internal combustion engine which further reduces hydrocarbon to be discharged together with exhaust gas even when the temperature of catalyst is low.
A controller 29 supplies hydrogen as fuel when the temperature of catalyst 25 is lower than an activation temperature, and supplies gasoline as fuel when the temperature of the catalyst 25 is the activation temperature or higher. Thereby, when the activation of the catalyst 25 is low, such as at starting, hydrogen is supplied to a gasoline engine 11, and the hydrocarbon contained in the exhaust gas becomes approximately zero. When the catalyst 25 has obtained the activation temperature or higher, the hydrocarbon contained in the exhaust gas is oxidized by the catalyst 25 that has reached the activation temperature. Therefore, if gasoline is supplied, the hydrocarbon to be released together with the exhaust gas into the atmosphere is reduced. The controller 29 also increases the open degree of a throttle 23 when supplying hydrogen, thereby increasing the flow rate of air and the amount of hydrogen jet to be sucked into a combustion chamber 19. Thereby, heating value is sufficiently ensured even when hydrogen is applied to fuel.
NISHIJIMA YOSHIAKI
KUROYANAGI MASATOSHI
| JPH05113117A | 1993-05-07 | |||
| JP2007269227A | 2007-10-18 | |||
| JP2006118372A | 2006-05-11 | |||
| JP2002339772A | 2002-11-27 |
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