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AssigneeSiemens Aktiengesellschaft
InventorsThomas Kettl, Hong Zhang
Estimating the term…
Fuels that are used nowadays can have a different densities or different heating values. Even when filling the fuel tank (7) the quality of the fuel in the fuel tank (7) can change since different fuels are mixed. For example a low density or a low heating value can lead to reduced performance of the internal combustion engine (1). It is therefore proposed that a fuel-specific factor k be determined using a sensor (2, 2a), with which the characteristic of the combustion chamber pressure and/or a lambda value is measured, and using an algorithm. In a further embodiment the operating parameters (injected quantity, start of injection, end of injection, injection pattern, exhaust gas recirculation rate, etc.) are corrected using the factor k.
A method for assessing the quality of a fuel being injected into a combustion chamber of an internal combustion engine, with at least one sensor being arranged on the internal combustion engine, the method comprising the steps of:
An arrangement for assessing the quality of a fuel, in particular a diesel or petrol fuel, comprising a combustion chamber of an internal combustion engine, at least one sensor and a motor control unit, and an evaluation unit operable to process an algorithm for evaluating the sensor signals, wherein the arrangement measures an operating parameter of the internal combustion engine with the at least one sensor, measures the pressure characteristic produced during combustion of the fuel in the combustion chamber, and/or measures at least one corresponding lambda value during a predetermined, constant operating point of the internal combustion engine, evaluates the measured pressure characteristic and/or the at least one lambda value using a stipulated algorithm, and as a result, determines a fuel-specific factor k with which the quality of the fuel is assessed.
Dependencies are inferred from the claim text.