Measuring and testing – Volume or rate of flow – Thermal type
Patent
1988-10-05
1990-03-27
Yasich, Daniel M.
Measuring and testing
Volume or rate of flow
Thermal type
7320411, 361424, 374135, 374175, G01F 0168, G01K 1306
Patent
active
049110098
ABSTRACT:
A thermal air flow meter for measuring the flow rate of intake air supplied to an internal combustion engine comprises a thermal sensor disposed in an intake air passage, a drive circuit including a circuit pattern formed on a circuit board for driving the thermal sensor, a shielding case having at least a bottom wall on which the circuit board is mounted and side walls, a through capacitor disposed on one of the side walls of the shielding case, a conductor extending through the capacitor so that the conductor is electrically connected in an AC mode through the capacitor to the shielding case and having one end connected to a corresponding terminal of the drive circuit and the other end connected to an external terminal, a metal case in which the shielding case is mounted and a connecting member electrically connecting the shielding case to the metal case at an area on the bottom wall selected between an edge of the bottom wall connected to the one side wall and an edge of the pattern formed on the circuit board closest to the one side wall, whereby the endurance electromagnetic compatability of the air flow meter is improved.
REFERENCES:
patent: 3798967 (1974-03-01), Gieles
patent: 4386388 (1983-05-01), Beun
patent: 4624582 (1986-11-01), Banda et al.
patent: 4658334 (1987-04-01), McSparran et al.
patent: 4733975 (1988-03-01), Komanetsky
Maeda Haruhiko
Suzuki Tadao
Hitachi , Ltd.
Yasich Daniel M.
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