Robert Boschgmbh

Ruediger Becker

Andreas Franz

Siegfried Boettcher

A method of operating an internal combustion engine of a motor vehicle supplying fuel by at least one supply pump with cyclically changing supply output into a pressure storage, injecting the fuel from the pressure storage under pressure by at least one injection valve at an injection time directly into a combustion chamber of the internal combustion engine, measuring a pressure acting on the fuel, and matching cycles of a supply output of at least one supply pump and an injection time of the fuel in time relative to one another.

Fuel control of direct-injection internal combustion engine of a motor vehicle, in particular in start operation

Method and device for operating an internal combustion engine for a motor vehicle, in which fuel is delivered under pressure by a delivery pump to a pressure chamber. The pressure acting upon the fuel in the pressure chamber is measured, and the fuel is injected by an injection valve directly into a combustion chamber of the internal combustion engine from the pressure chamber as a function of the measured pressure acting upon the fuel. When varying the working point of the internal combustion engine with regard to the pressure acting upon the fuel, it must be possible to control injection as accurately as possible even within the transient range, thus providing a sufficiently comfortable driving performance even within the transient ranges. This is achieved, in particular, in that the actual pressure acting upon the fuel is computed within the transient range and the working point of the internal combustion engine is adjusted correspondingly to this pressure.

Method and device for the transient operation of an internal combustion engine, in particular for a motor vehicle

There are a number of controlling elements of an internal combustion engine which have an influence on the charge of the cylinders. For each controlling element, a triggering instant is determined that is adapted to its individual reaction time, so that all the controlling elements simultaneously deploy their action influencing the charge. In this manner, a desired charge is attained at a defined instant, thus permitting a harmonious adjustment of the charge to other operating parameters. This optimizes the driving properties, the performance and the fuel consumption of the internal combustion engine.

Method for triggering the controlling elements of an internal combustion engine

A need-based method of heating a catalyst in the exhaust-gas system of an internal combustion engine, in which a converting power of the catalyst is determined and the catalyst is heated as a function of the converting power. Depending on the operating conditions of the internal combustion engine, different measures are undertaken for the heating of the catalyst. If the heating measures do not lead to the desired results within a predetermined time interval, a diagnostic function is started. As part of the diagnostic function, particularly effective heating measures are applied. If while using these measures a sufficient converting power of the catalyst is not obtained within a predetermined second time interval, it is assumed that the catalyst is damaged.

Need-based method of heating a catalyst in the exhaust system of an

The invention is directed to a method wherein measures are initiated for accelerating the warm-up of the catalyzer even for a warm engine such as after a warm start thereof. In this way and when there is an interruption of operation, the cooling off of the engine and the catalyzer, which takes place at different rates, and the effect thereof on the conversion rate is opposed. As a consequence thereof, the emission of unwanted exhaust-gas components after a warm start is reduced.

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Murr, Germany

Ruediger Becker