| 摘要 |
<p>An arrangement and a method for estimating a fuel mixture's content of a supplementary fuel. A combustion engine (1) includes a common rail system with a high-pressure pump (6) which feeds to an accumulator tank (7) for storage of the fuel mixture before it is injected into the engine (1). A control unit determines the pressure change (Δp) in an accumulator tank (7) within a period of time (Δt), based on pressure values from a pressure sensor (7a), providing information about a corresponding pressure change (Δp0) on a reference mixture with a known content of the supplementary fuel within a corresponding period of time (Δt) and estimates the fuel mixture's content of the supplementary fuel by comparing the pressure change (Δp) on the fuel mixture with the pressure change (Δp0) on the reference mixture.</p> |
