초록

A composite material having a film operatively associated with a polyolefin foam layer and at least one metallic layer operatively associated with at least one of the foam layer and the film.

대표청구항 ▼

A composite material having a film operatively associated with a polyolefin foam layer and at least one metallic layer operatively associated with at least one of the foam layer and the film. showing the relationship between the engine rotational speed and required torque required for obtaining a r

A composite material having a film operatively associated with a polyolefin foam layer and at least one metallic layer operatively associated with at least one of the foam layer and the film. showing the relationship between the engine rotational speed and required torque required for obtaining a required output, said control device causing the engine to generate a required torque on the first control line in accordance with the required output and controlling the gear ratio of the variable speed transmission to give an engine rotational speed on the first control line in accordance with the required output when the extent of activation of the exhaust purification device is low, said control device causing the engine to generate a required torque on the second control line in accordance with the required output and controlling the gear ratio of the variable speed transmission to give an engine rotational speed on the second control line in accordance with the required output when the extent of activation of the exhaust purification device is high; wherein under an engine rotational speed and required torque on the second control line, the fuel economy is better than by the first control line, but the amount of harmful components in the exhaust gas becomes greater. 2. A direct injection type engine as set forth in claim 1, wherein said exhaust gas purification device is comprised of a particulate filter able to remove by oxidation particulate in an exhaust gas and having the function of absorbing NOxin the exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean and releasing the absorbed NOxwhen the air-fuel ratio of the inflowing exhaust gas is the stoichiometric air-fuel ratio or rich, and it is judged that the extent of activation of the exhaust gas purification device is high when it is estimated that an amount of particulate deposited on the particulate filter is less than a predetermined amount and a temperature of the particulate filter is in a temperature range giving an NOxabsorption rate of more than a certain value. 3. A direct injection type engine as set forth in claim 2, wherein as said particulate filter, use is made of a particulate filter able to remove by oxidation any particulate in the exhaust gas flowing into the particulate filter without emitting a luminous flame when an amount of discharged particulate discharged from the combustion chamber per unit time is smaller than an amount of particulate which can be removed by oxidation without emitting a luminous flame per unit time on the particulate filter. 4. A direct injection type engine as set forth in claim 3, wherein a precious metal catalyst is carried on the particulate filter. 5. A direct injection type engine as set forth in claim 4, wherein an active oxygen release agent, taking in oxygen and holding the oxygen when excess air exists in the surroundings and releasing the held oxygen in the form of active oxygen when a concentration of oxygen in the surroundings falls, is carried on the particulate filter, and active oxygen is released from the active oxygen release agent when particulate deposits on the particulate filter, particulate deposited on the particulate filter being oxidized by the released active oxygen. 6. A direct injection type engine as set forth in claim 3, wherein the air-fuel ratio of the exhaust gas flowing into the particulate filter is made temporarily rich when NOxshould be released from the particulate filter. 7. A direct injection type engine as set forth in claim 6, wherein the air-fuel ratio of the exhaust gas flowing into the particulate filter is made rich over a longer time than a time of release of NOxfrom the particulate filter when SOxshould be released from the particulate filter. 8. A direct injection type engine as set forth in claim 1, wherein judging means is provided for judging if particulate has deposited to more than a certain extent on the particulate filter, said control means changing the control of the torque generated by the engine and the gear ratio of the variable speed transmission from control based on