Fuel system for an internal combustion engine and method of controlling the fuel system
A fuel system, internal combustion engine technology, applied in the layout, fuel injection control, charging system, etc. combined with the fuel supply of the internal combustion engine, can solve the problems of not mentioning how the fuel system works, and the fuel pump cannot generate sufficient fuel flow, etc.
Active Publication Date: 2019-04-09
SCANIA CV AB
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- Application Information
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Problems solved by technology
Fuel pump operated by the internal combustion engine does not produce sufficient fuel flow during engine idling
However, document WO 2004 / 037595 A1 does not mention how the fuel system works in the event of a failure of the fuel pump driven by the internal combustion engine
Method used
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Embodiment Construction
[0035] According to the invention, the fuel system comprises three flow paths, where the flow direction of the fuel can be controlled by means of a reversible main feed pump and transfer pump, depending on whether the components in the fuel system are functioning properly, i.e. under normal operation , and / or if there is an operational interruption in the main feed pump or transfer pump of the fuel system. In this way, redundancy is achieved in the fuel system.
[0036] In the fuel system, by arranging the main supply pump operated by the electric motor and the transfer pump operated by the electric motor in the low pressure circuit, redundancy can be obtained compared to having only one fuel pump in the fuel system. By providing three flow paths, the transfer pump can directly supply fuel from the second fuel tank to the internal combustion engine in the event of an operation interruption of the main supply pump, and the main supply pump can directly supply fuel to the intern...
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The invention relates to a fuel system for an internal combustion engine (2), which fuel system (4) comprises a first fuel tank (20), a second fuel tank (22), a main supply pump (26) and a transfer pump (28), wherein a first electric engine (M1 ) is arranged to operate the main supply pump (26), and a second electric engine (M2) is arranged to operate the transfer pump (28). The main supply pump (26) and the transfer pump (28) are reversible, and the fuel system (4) comprises a first flow circuit (100) for the fuel flow, through which the fuel is led at normal operation, a second flow circuit (200) through which the fuel is led at an operational disruption in the main supply pump (26), and a third flow circuit (300) for the fuel flow, through which the fuel is arranged to flow at an operational disruption in the transfer pump (28). The fuel system reduces the risk of insufficient or non-existing fuel supply to the internal combustion engine in the event of an operational disruption, and enables a method for continued operation, albeit with potentially reduced power. This also secures the operation of the internal combustion engine (2) and a vehicle equipped with such a fuel system.
Description
technical field [0001] The present invention relates to a fuel system for an internal combustion engine and a method of controlling the fuel system. The invention also relates to an internal combustion engine and a vehicle according to the appended claims. Background technique [0002] Internal combustion engines, such as diesel engines or Otto engines, are equipped with a fuel system for delivering fuel from one or more fuel tanks to the injection system of the internal combustion engine. The fuel system includes one or more fuel pumps, which may be mechanically driven by the internal combustion engine or driven by an electric motor. The fuel pump generates fuel flow and pressure to deliver fuel to the injection system of the internal combustion engine, thereby supplying fuel to the combustion chambers of the internal combustion engine. [0003] Fuel systems often consist only of mechanical fuel pumps driven and controlled by the internal combustion engine. If the fuel p...
Claims
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IPC IPC(8): F02D41/30F02M37/00F02M37/08F02M37/18F02D33/00B60K15/03
CPCF02M37/0023B60K15/03B60K2015/03118B60K2015/03138B60Y2200/14F02D33/006F02D41/3082F02M37/007F02M37/0088F02M37/08F02M37/18
Inventor E·许尔贝里
Owner SCANIA CV AB