Abstract:
A method for controlling a solenoid valve, particularly in a motor vehicle. The inventive method is characterized by applying a first voltage (U—1) to a coil (21) of the solenoid valve (22) until a first point in time (t—1) and then applying a second voltage (U—2) with a smaller value. The first point in time t—1 precedes the point in time at which the solenoid valve (22) reaches its final position.
Abstract:
A high-pressure fuel pump for an internal combustion engine is proposed, in which the regulating behavior in idling and lower partial-load operation is improved to such an extent that a separate pressure regulating valve in the high-pressure region of the fuel injection system can be dispensed with.
Abstract:
A method is provided for starting an internal combustion engine which includes a starter, an ignition, pressure store and injection valves for injecting fuel directly into the engine. An electrical high pressure pump is connected to an electrical fuel pump downstream thereof for pumping the fuel into the pressure store. The electrical fuel pump and the electrical high pressure pump are first switched on together with the ignition in order to generate a pressure in the pressure store adequate for the injection of the fuel. Then, the starter is switched on after a time duration after the electric fuel pump and the electrical high pressure fuel pump are switched on.
Abstract:
A high-pressure fuel pump which is suitable above all for use in internal combustion engines with direct gasoline injection, in which the pressure surge upon opening of a check valve between the high-pressure line and the pumping chamber of the fuel feed pump is limited by structural provisions.
Abstract:
A fuel supply system with two series-connected pumps and fuel injection valves that inject fuel directly into a combustion chamber of an engine. The system includes a relief device. In a simple embodiment, the relief device can assure that the pressure in the pressure line can drop when the engine has been shutoff. The relief line may, however, also be embodied such that during the entire time of engine operation, the pressure in the pressure line can be lowered at any time as needed. The apparatus and the method are intended for an internal combustion engine of a vehicle.
Abstract:
A piston pump for pumping fuel in which a risk of fuel getting into the area of a shaft seal is limited. The fuel pump includes a separation chamber which is provided between a shaft seal and a fuel chamber that contains fuel. Located in the separation chamber is for instance air as a separator means, and the separation chamber communicates with an air inlet of the engine. This assures that fuel cannot get into the area of the shaft seal or escape to the outside. The fuel pump is suitable in particular for internal combustion engines in which the fuel must be delivered at high pressure.
Abstract:
Fuel injection device for spark-ignition internal combustion engines having a pump and a distributor with a reversing valve, which distributor is preferably driven at pump speed and has a stationary and a rotating part. The reversing valve is arranged inside the rotating part of the distributor, preferably concentrically, and its inlet opening is connected with the pump work space via a line which likewise extends exclusively inside the rotating part of the distributor.
Abstract:
A fuel injection system, for internal combustion engines in which fuel is brought to high injection pressure and distributed via magnet valves to the various fuel injection locations with the aid of a simple, unregulated high-pressure injection pump; high-pressure injection does not take place until a fuel injection quantity control valve, connected to the distribution of the high-pressure side, has closed a relief line. It thus becomes possible to vary the injection time to the maximum possible extent, without entailing major structural expense.
Abstract:
A hydraulic engine valve control having a reservoir chamber, which is assigned to a pressure chamber of a valve tappet and has a reservoir piston, which at the same time serves as a valve by which the reservoir chamber can be disconnected from the pressure chamber. The reservoir piston is displaceable out of its position of repose into its reservoir function by a hydraulic control device that cooperates with a magnet valve. In this process, it is also attained that a plurality of valve control units of one internal combustion engine can be controlled via a single magnet valve, if their various control times do not overlap.
Abstract:
In a reservoir-type fuel injection system, fuel can be supplied under pressure by a charge pump to two separate pressure reservoirs and the pressure reservoirs communicates via separate valve assemblies with injection nozzles via lines. By means of the separate reservoirs, overlapping of pre-injection and main injection events in different cylinders can be avoided.