The invention relates to a method for identifying a type of fuel or a fuel mixture which is composed of a plurality of types of fuel, on the basis of a lambda-value change to operate an internal combustion engine comprising a combustion chamber, the internal combustion engine being operable with different types of fuels or fuel mixtures. The combustion chamber comprises a first inlet port, connected to a first intake tube, in which tube a first injection valve is arranged. The combustion chamber further comprises a second inlet port, connected to a second intake tube, in which tube a second injection valve is arranged. In a normal mode of operation, a predetermined fuel quantity is injected, the predetermined fuel quantity being composed of a first fuel quantity to be injected through the first inlet valve and a second fuel quantity to be injected through the second inlet valve. In a first method step, the first injection valve remains closed and in a second method step, the first injection valve is opened again, wherein in the second method step, a first test fuel quantity is injected into the combustion chamber via the first inlet port and a second test fuel quantity via the second inlet port, the first test fuel quantity and the second test fuel quantity adding up to the predetermined fuel quantity.

Method for identifying fuel mixtures

A fuel property determining device for an engine is provided, the device retarding a fuel injection timing and determining a fuel property based on a combustion variation of the engine caused by the retarding. The device includes a processor configured to control a parameter related to combustibility so as to degrade a combustion state before the fuel injection timing is retarded, the parameter being different from the fuel injection timing.

Fuel property determining device and combustion control device for engine

A fuel property judgmental device for an internal-combustion engine that makes accurate judgment of index values of the ignition property and evaporative property for the fuel individually. The fuel property judgmental device is provided with a fuel injection valve (12) the fuel injection direction of which is set up such that the fuel passes in the direction toward a cylinder wall surface (54). The judgmental device acquires an air/fuel ratio of exhaust gas (first air/fuel ratio) and a crank angular velocity (first crank angular velocity) at the time of combustion involved in the fuel injection during a first post-injection timing T1. Subsequently, the judgmental device acquires an air/fuel ratio of exhaust gas (second air/fuel ratio) and a crank angular velocity (second crank angular velocity) at the time of combustion involved in the fuel injection during a second post-injection timing T2 that is lagged in angle from the first post-injection timing T1. Finally, the judgmental device makes judgment of the cetane value and evaporative property in accordance with Δ A/F that is a variation in the first air/fuel ratio and the second air/fuel ratio, Δ crank angular velocity that is a variation in the first crank angular velocity and the second crank angular velocity, and the predefined basic judgmental information.

西海亮児

Papers

Fuel property judgmental device for internal-combustion engine

西海 亮児

Papers

Fuel property judgmental device for internal-combustion engine

西海亮児