Measuring and testing – Volume or rate of flow – Thermal type
Patent
1994-12-06
1996-07-23
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
7320415, G01F 168
Patent
active
055378714
ABSTRACT:
A hot wire type air flowmeter has a drive circuit for controlling the temperature of a hot wire type resistor and for outputting indications of controlling states as electric signals, an output adjusting circuit for adjusting the electric signals output from the drive circuit, and a subtracter provided in the output adjusting circuit of the hot wire type air flowmeter. The electric signals output from a non-inverting amplifier in the drive circuit are input to one input terminal of the subtracter and a standard voltage supplied via a voltage follower are input to the other input terminal of the subtracter.
REFERENCES:
patent: 4400974 (1983-08-01), Nishimura et al.
patent: 4682496 (1987-07-01), Miura et al.
Akamatsu Masuo
Itsuji Takayuki
Yoneda Hiroshi
Chilcot Richard
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Patel Harshad
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