Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2005-01-04
2005-01-04
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C702S100000, C702S116000, C073S118040, C701S102000
Reexamination Certificate
active
06839643
ABSTRACT:
In a thermal-type airflow meter that measures an intake airflow rate in an internal combustion engine of an automobile or the like, there has been a problem that pulsation errors caused by external fluctuations under the environment including a large pulsation and reverse flow in the intake valve are difficult to be reduced. In order to solve this problem, the invention provides a flowmeter comprising a detection element that outputs a non-linear signal corresponding to a flow rate, and a regulation means that regulates an output signal of the detection element for controlling. With this construction, the regulation means executes output regulation processing that regulates irregularities of the detection element in the output signal, and inequality linearization processing that regulates an average value of the output signal after the output regulation processing by means of regulating parameters.
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Hanzawa Keiji
Igarashi Shinya
Kanke Atsushi
Matsumoto Masahiro
Ueyama Kei
Barlow John
Crowell & Moring LLP
Hitachi , Ltd.
Hitachi Car Engineering Co. Ltd.
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