Measuring and testing – Liquid level or depth gauge – Float
Patent
1989-09-05
1991-02-12
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Float
73304R, G01F 2300
Patent
active
049914359
ABSTRACT:
A liquid level indicating system particularly applicable to monitoring the fuel level in a motor vehicle includes an anti-slosh feature incorporated into a system amplifier to substantially eliminate fluctuations in the fuel level indicated by a fuel gauge driven by the amplifier. The anti-slosh feature is provided by limiting the slew rate of the amplifier during normal operation of the system. The slew rate is limited by using a limited current source to provide dc bias current within the amplifier such that the output can change only at the limited slew rate. To make the system respond rapidly upon start up of a vehicle including the system, the normally limited current source is supplemented by a secondary current source which provides substantially higher dc bias current within the amplifier and accordingly a substantially higher slew rate for the amplifier. The secondary current source is activated for a defined period of time to allow the fuel gauge to initialize, and then is disabled such that the amplifier is thereafter slew rate limited to correct for fuel slosh.
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patent: 4857863 (1989-08-01), Ganger et al.
National Semiconductor, Appendix A, "The Monolithic Operational Amplifier: A Tutorial Study", pp. 1180-1200.
Cuchlinski Jr. William A.
Ford Motor Company
May Roger L.
Mollon Mark L.
Worth W. Morris
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