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摘要

To further promote the catalyst light-off over the conventional apparatus in this kind without deteriorating emission performance and fuel efficiency. A tumble generating means (10, 27, 28), a fuel injector (18) which injects fuel in the direction opposite to the tumble flow into the combustion chamber (6), a catalyst (31) disposed in its exhaust-gas passage (22), a temperature-condition determining means (41) for determining the temperature condition of the catalyst (31), and a fuel-injection control means (43) are provided. The fuel-injection control means (43) controls the fuel injector (18) to perform divided injections of the leading injection and the trailing injection during the compression stroke in an inactivated state of the catalyst (31). The trailing injection is performed at such a timing that its mixture concentrates in the proximity of the spark plug (16) at the ignition timing by means of high cylinder pressure during the late-stage of the compression stroke. The leading injection is performed at such a timing that its mixture distributes around the mixture layer by the trailing injection at the ignition timing. IMAGE