Method for pulsation correction within a measuring device measuring a media mass flow
AssigneeRobert Bosch GmbH
InventorTobias Lang
Life of this patent
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Abstract
A method and a device for the pulsation correction of measured values of a flow device, which is used to measure pulsating gas flows in internal combustion engines. A raw signal of the flow sensor is fed to an adder of a compensation circuit. The raw signal is at the same time fed to a multiple frequency filter, which has at least one high-pass filter, at least one low-pass filter and at least one band-pass filter. The filtered signals are written into addresses of a correction characteristics map. The values stored in addresses are added to the raw signal by the adder.
Claims13
A method for a pulsation correction of a measured value of a flow measuring device, comprising:
- detecting a pulsating gas flow in an internal combustion engine;
- feeding a raw signal to an adder of a compensation circuit;
- feeding the raw signal to a multiple frequency filter to produce a filtered signal, the multiple frequency filter including at least one high-pass filter, at least one low-pass filter, and at least one band-pass filter;
- writing the filtered signal into an address of a correction characteristics map;
- and
- adding a values stored in the address to the raw signal by the adder.
A device for a pulsation correction of a measured value of a flow measuring device, comprising:
- an analog compensation circuit including a multiple frequency filter;
- a correction characteristics map assigned to the multiple frequency filter as an m×n matrix;
- and
- an adder for adding an entry of the characteristics map in the correction characteristics map to a raw signal.
Dependencies are inferred from the claim text.