Signal processing device, and engine control device
AssigneeHitachi Astemo, Ltd.
InventorYoshihiko Akagi
Life of this patent
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Abstract
Provided is a signal processing device capable of effectively reducing a work load of a parameter setting operator in response to an increase in parameters constituting complicated filter control. Therefore, in the signal processing device filters an output signal from a sensor mounted on a vehicle, setting is made with respect to a plurality of filters having different filter types or filter coefficients for setting a filter characteristic of a cutoff frequency or a pass band, an individual code is set for each of the plurality of filters, and the signal processing device includes a CPU that selects the individual code based on an engine operating state so that a corresponding filter is selected, and processes an output signal from the sensor using the filter that has been selected.
Claims6
A signal processing device configured to filter an output signal from a sensor mounted on a vehicle, comprising:
- a central processing unit (CPU) configured to:
- set with respect to a plurality of filters having different filter types or filter coefficients for setting a filter characteristic of a cutoff frequency or a pass band,
- set an individual code for each of the plurality of filters,
- select the individual code based on an engine operating state so that a corresponding filter is selected, and
- process an output signal from the sensor using the filter that has been selected,
- wherein the sensor is a knock sensor configured to detect a knock of an engine mounted on the vehicle;
- a storage configured to store a relationship with a specific frequency (Pfi) of a pressure wave in a cylinder corresponding to a specific frequency (Kfi) of a knock sensor signal for each engine operating state, and
- wherein the CPU is configured to calculate a knock intensity (K(Kfi)) of the specific frequency of the knock sensor signal based on the signal processed by the filter that has been selected.
An engine control device configured to control an engine including a sensor, comprising:
- a storage configured to store a filter type and a filter coefficient for setting a plurality of filters having different cutoff frequencies or pass bands, and
- a central processing unit (CPU) having an individual code assignment function that can associate an individual code with each of the plurality of filters,
- the CPU configured to select the individual code based on an engine operating state so that a corresponding filter is selected, and process an output signal from the sensor using the filter that has been selected,
- wherein the sensor is a knock sensor that detects a knock of an engine mounted on the vehicle,
- wherein the storage is configured to store a relationship with a specific frequency (Pfi) of a pressure wave in a cylinder corresponding to a specific frequency (Kfi) of a knock sensor signal for each engine operating state.
Dependencies are inferred from the claim text.