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Title:
SIGNAL PROCESSING METHOD OF HOT-WIRE FLOW SENSOR
Document Type and Number:
Japanese Patent JPS56108912
Kind Code:
A
Abstract:

PURPOSE: To fetch required data accurately at any time even if the revolution number of an engine changes, by AD-converting and inputting to CPU a signal from a hot-wire flow sensor to CPU at every AD conversion processing time of an AD converter.

CONSTITUTION: Analog data from hot-wire flow sensor 24 is converted by AD converter 128 before being fetched into RAM106. The timing of this fetch coincides with every completion of the conversion of AD converting circuit 128, so that the processing can be considered to be performed in response to every prescribed angle signal outputted from crank angle sensor 146 in correspondence to the revolution number of an engine. Then, as a prescribed number of data are stored in storage device 106, CPU102 calculates the average air quantity in one suction process of the engine by a program stored in ROM104.


Inventors:
SAKAMOTO SHINICHI
YANO MATSUO
SASAYAMA TAKAO
Application Number:
JP1980000011354
Publication Date:
August 28, 1981
Filing Date:
January 31, 1980
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
F02D41/18; G01F1/00; G01F1/68; G01F1/696; G01F1/72; (IPC1-7): F02D35/00; G01F1/68; G01F1/72



 
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