Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2007-04-17
2007-04-17
Hirshfeld, Andrew H. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S610000, C324S725000, C073S118040, C073S204150, C073S204250
Reexamination Certificate
active
11037764
ABSTRACT:
A circuit for measuring the mass air flow rate through a duct is disclosed. The circuit includes a bridge circuit, a first amplifier, an oscillator, a comparator and a switch. The bridge circuit has a plurality of resistors arranged to output first and second bridge voltage signals. The first amplifier circuit receives the first and second bridge voltage signals and generates a differential bridge voltage signal. The oscillator provides an oscillating control signal. The comparator is in communication with the first amplifier circuit and the oscillator for comparing the differential bridge voltage signal to the oscillating signal to generate a pulse width modulated differential bridge voltage signal. The switch is in communication with the bridge circuit and the comparator. The switch selectively provides a power voltage signal to the bridge circuit at a frequency corresponding to the pulse width modulated differential bridge voltage signal.
REFERENCES:
patent: 4753111 (1988-06-01), Caron et al.
patent: 4807151 (1989-02-01), Citron
patent: 4934188 (1990-06-01), Tanimoto et al.
patent: 4934189 (1990-06-01), Tanimoto et al.
patent: 4966033 (1990-10-01), Nishimura et al.
patent: 5092164 (1992-03-01), Matsuoka et al.
patent: 5156046 (1992-10-01), Tanimoto et al.
patent: 5212983 (1993-05-01), Ott et al.
patent: 5423210 (1995-06-01), Uchiyama
patent: 5533412 (1996-07-01), Jerman et al.
patent: 5629481 (1997-05-01), Sultan
patent: 5654507 (1997-08-01), Hicks et al.
patent: 5679892 (1997-10-01), Tomisawa et al.
patent: 5681989 (1997-10-01), Kanke et al.
patent: 5753815 (1998-05-01), Murata
patent: 6240775 (2001-06-01), Uramachi et al.
patent: 6327905 (2001-12-01), Itsuji et al.
patent: 6474155 (2002-11-01), Berkcan et al.
patent: 6494090 (2002-12-01), Lösing et al.
patent: 6539793 (2003-04-01), Tanimoto et al.
patent: 6575027 (2003-06-01), Larsen et al.
patent: 6681625 (2004-01-01), Berkcan et al.
patent: 6684693 (2004-02-01), Tanimoto et al.
patent: 2002/0170352 (2002-11-01), Tanimoto et al.
patent: 2002/0178807 (2002-12-01), Tanimoto et al.
patent: 2004/0040377 (2004-03-01), Tanimoto et al.
Brinks Hofer Gilson & Lione
Dole Timothy J
Hirshfeld Andrew H.
Visteon Global Technologies Inc.
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