초록 ▼

A direct-injection, spark-ignition engine of the present invention includes a turbo-charging device which promotes the temperature rise or activation of the exhaust-gas purification catalyst disposed downstream of a turbine during cold start. During engine cold start, the fuel injection by the fuel

A direct-injection, spark-ignition engine of the present invention includes a turbo-charging device which promotes the temperature rise or activation of the exhaust-gas purification catalyst disposed downstream of a turbine during cold start. During engine cold start, the fuel injection by the fuel injector is divided into a leading fuel injection performed during the latter half of the compression stroke, prior to the ignition timing, and a trailing fuel injection performed during the expansion stroke, after the ignition timing. The amount of the intake-air and the amount of the fuel injection are so controlled that the air-fuel ratio in the combustion chamber during the combustion of the fuel by the leading fuel injection (a leading air-fuel ratio) is within the range of 2<λ<3, and the air-fuel ratio in the combustion chamber during the combustion of the fuel by the trailing fuel injection (a total air-fuel ratio) is within the range of 1<λ<2. This raises exhaust-gas temperature with heat from the combustion of the fuel injected in the compression stroke and by the oxidization of the unburned HG from turbine agitation, to raise the exhaust-gas temperature for promoting the temperature rise or activation of the exhaust-gas purification catalyst downstream of the turbine.

대표청구항 ▼

A direct-injection, spark-ignition engine of the present invention includes a turbo-charging device which promotes the temperature rise or activation of the exhaust-gas purification catalyst disposed downstream of a turbine during cold start. During engine cold start, the fuel injection by the fuel

A direct-injection, spark-ignition engine of the present invention includes a turbo-charging device which promotes the temperature rise or activation of the exhaust-gas purification catalyst disposed downstream of a turbine during cold start. During engine cold start, the fuel injection by the fuel injector is divided into a leading fuel injection performed during the latter half of the compression stroke, prior to the ignition timing, and a trailing fuel injection performed during the expansion stroke, after the ignition timing. The amount of the intake-air and the amount of the fuel injection are so controlled that the air-fuel ratio in the combustion chamber during the combustion of the fuel by the leading fuel injection (a leading air-fuel ratio) is within the range of 2<λ<3, and the air-fuel ratio in the combustion chamber during the combustion of the fuel by the trailing fuel injection (a total air-fuel ratio) is within the range of 1<λ<2. This raises exhaust-gas temperature with heat from the combustion of the fuel injected in the compression stroke and by the oxidization of the unburned HG from turbine agitation, to raise the exhaust-gas temperature for promoting the temperature rise or activation of the exhaust-gas purification catalyst downstream of the turbine. ry a series of pairs of bell-shaped profiles (P1, P2) which are programmed. 5. Sleeve-placing apparatus according to claim 1, having a pair of first wheels (30, 31) driven by a common electric motor (41), and a pair of second wheels (32, 33) each driven by a respective electric motor (42, 43) one of which (43) is slaved to the other (42). 6. Sleeve-placing apparatus according to claim 5 further including third wheels (34, 35) disposed immediately downstream from the cutting means (27), said third wheels being mechanically coupled to the first wheels (30,31) to rotate at a slightly higher speed than the speed of said first wheels, the axes of said third pair of wheels being offset from the axes of the second pair of wheels (32, 33) by a distance which corresponds substantially to the length of a cut-off sheath segment (15). 7. Sleeve-placing apparatus according to claim 1, further including third wheels (34, 35) disposed immediately downstream from the cutting means (27), said third wheels being mechanically coupled to the first wheels (30, 31) to rotate at a slightly higher speed than the speed of said first wheels. 8. Sleeve-placing apparatus according to claim 1, wherein the common programmer (50) also includes an electronic control card (55) associated with the stepper conveyor means (11, 12) for conveying the articles, in order to control said means from the rotary encoder (47).