Avl Gesellschaft Fur Verbrennungskraftmaschinen Und Messtechnik M.b.h.

Avl Gesellschaft

Volker Pichl

Diethard Plohberger

Herwig Ofner

Christof D Fischer

Leopold Mikulic

In a device for controlling the lift of a hydraulically operated valve comprising an actuating element which is pressure-loaded or spring-loaded in closing direction and which acts as the boundary of an actuating chamber in the valve cage, and further comprising a pressure-generating unit, the valve lift is made continuously adjustable, independent of the control times of the valve, by providing that a flying setting plunger be used, which is guided in a cylinder, and which bounds a pressure from the actuating chamber in the valve cage, and by further providing that the pressure-generating unit have a high pressure line controlled by a valve and leading into the pressure chamber, as well as a low pressure line controlled by another valve and leading into the actuating chamber, the setting plunger being pressed against a stop in the cylinder during maximum valve lift.

Device for controlling the lift of a hydraulically operated valve

To improve control of the scavenging in accordance with the load and speed conditions in a two-stroke internal combustion engine with scavenge passages which open into the interior of the cylinder and an outlet passage and with scavenge ports and an outlet port governed by the piston of said internal-combustion engine, the present invention provides that communication with said scavenge passages is governed by an electromagnetically unlocking pressure-controlled valve, which is positioned in a passageway section and actuation of which within the opening periods of the scavenge ports, blocks the flow of the scavenging agent to the individual scavenge ports to the effect that the period of scavenging is timed relative to the load and speed conditions under which the internal-combustion engine is working.

Scavenge control system

For control of the injection rate of a device for feeding fuel into the combustion chamber of an internal combustion engine, comprising an injection valve opening into the combustion chamber, which is used for taking compressed gas from the cylinder and injecting it together with the fuel supplied by a metering device, and further comprising a gas storage cell for holding the compressed gas, the proposal is put forward that a variable throttle be provided between the valve seat of the injection valve and the gas storage cell, whose flow cross-section can be controlled in accordance with load and speed parameters of the engine.

Growing community of inventors

Graz, Austria

Volker Pichl