Abstract:
The invention relates to a suction system for supplying an internal combustion engine (18) with combustion air, especially in an automobile. The inventive suction system comprises at least one separate air collector (14) from which individual suction pipes (16) each lead to the air inlets of the respective cylinders of the internal combustion engine (18). Said suction pipes (16) are configured as ram tubes for the top speed areas of the internal combustion engine (18). At least one compensation flap (20) is located in the air collector (14). When closed, the compensation flap divides the air collector (14) to provide a long pre-suction section (12, 22) and when open, instead of a long pre-suction section (12, 22) provides an air collector (14) with an increased volume.
Abstract:
An arrangement for exhaust gas feedback in a four-stroke combustion engine with at least two cylinders (A, B) cooperating with one another, whereby each cylinder in the engine is connected by a transfer line (8) to another cylinder operating with substantially approximately 360 DEG displacement. Exhaust gas feedback is made possible by using the overpressure prevailing in the respective cylinder (A, B) during its expansion stroke to feed exhaust gases back to the cooperating cylinder during the latter's induction stroke. This is made possible by the fact that the transfer line is provided with controllable valves (8) at both of its respective ends and by the fact that the transfer line leads into the respective cylinders.
Abstract:
A multi-cylinder spark ignition internal combustion engine is described having two groups of cylinders (10a, 10b). One group of cylinders may be selectively disabled by cutting off its fuel supply while continuing to receive air. The exhaust system includes an NOx trap (20) to store NOx gases while the exhaust gases contain excess air. During part load operation, the engine is run with one group of cylinders disabled most of the time during which NOx gases are stored in the NOx trap (20). In order to permit the trap (20) to be regenerated or purged periodically, both group are fired at the same time for short intervals to supply a stoichiometric or reducing mixture to the exhaust system.
Abstract:
Herein are disclosed methods of conditioning fluid, such as damping fluid, in an electronically-controlled unit injector (18) in order to facilitate quick starting of an engine (12). Fluid normally used to dampen the motion of an electrical actuator assembly (36) of the unit injector (18) can remain in the actuator assembly (36) after the engine (12) is stopped. If too much fluid remains and cools off in the actuator assembly (36), quick starting of a cold engine may be hindered. Each of the above methods expels and/or heats up at least a portion of the remaining fluid in the actuator assembly (36) while the engine (12) is at rest and thereby enables quicker response of the actuator assembly (36) when the engine (12) is started. Such quicker response improves the fuel injection delivery capability and timing accuracy of the unit injector (18) during engine startup.