Importance

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Abstract

An arrangement in a vehicle engine includes an intake air manifold, an exhaust gas manifold and a plurality of cylinders, and is adapted for being operated by a dual fuel including diesel and gas fuel. The arrangement further includes an exhaust gas recirculation line connecting the exhaust gas manifold with the intake, air manifold, an exhaust gas recirculation valve arranged in the exhaust gas recirculation line, and a control unit arranged for controlling the operation of the exhaust gas recirculation valve. The arrangement further includes a knock sensor arranged on the engine and connected to the control unit; the control unit being adapted for opening the exhaust gas recirculation valve in the event that knock is detected by the knock sensor. The arrangement can permit a dual fuel engine to be used with methane gas having a wide variety of methane numbers without causing the engine to knock.

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First Claim