Digital filter and vehicle driving force control apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomohiro Naruse
Life of this patent
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Abstract
To suppress an unstable operation of a device caused by filtering, an output selection unit is configured to acquire an unfiltered value representing an input signal (signal before filtering) stored in an input holding unit, a filtered value representing a signal acquired by filtering the input signal by a filtering unit, and a previous output value representing an output signal output at a previous time, select a middle value out of the filtered value, the unfiltered value, and the previous output value, and set the selected middle value as a current output value of an output signal.
Claims12
A digital filter, which is configured to output an output signal acquired by reducing a specific frequency component from a digital signal input to the digital filter, and which is to be used for a system in which an operation of a device is controlled depending on an output value of the output signal, the digital filter comprising:
- filtering means for applying filtering to the digital signal input;
- and
- output value setting means for acquiring an unfiltered value represented by the digital signal input, a filtered value represented by a signal acquired by filtering the digital signal input by the filtering means, and a previous output value represented by a previously output signal output at a previous time as a current output value, selecting a middle value of the unfiltered value, the filtered value, and the previous output value, and setting the current output value of a current output signal based on the selected middle value.
Dependencies are inferred from the claim text.