초록 ▼

The input voltage from a fuel tank level sender is processed by an anti-slosh circuit which has a short time constant during a fast acquire operation and a longer time constant during normal operation. The slew rate of the output voltage provided to a gauge is determined by the clock rate of an up/d

The input voltage from a fuel tank level sender is processed by an anti-slosh circuit which has a short time constant during a fast acquire operation and a longer time constant during normal operation. The slew rate of the output voltage provided to a gauge is determined by the clock rate of an up/down counter which is determined by switched resistances and a small valued capacitor. Either analog or digital anti-slosh outputs are provided.

대표청구항 ▼

An anti-slosh circuit for a liquid level signal from a liquid level sensor in a vehicle, said liquid level signal having a voltage varying within a first range of voltages according to a sensed liquid level, said circuit comprising: a voltage comparator for receiving said liquid level signal at one

An anti-slosh circuit for a liquid level signal from a liquid level sensor in a vehicle, said liquid level signal having a voltage varying within a first range of voltages according to a sensed liquid level, said circuit comprising: a voltage comparator for receiving said liquid level signal at one comparator input and for providing a bistable comparator output signal; up/down counter means for counting a clock signal to provide a count, said up/down counter means being coupled to said voltage comparator and being responsive to said comparator output signal to determine an up or down counting direction; digital-to-analog converter means coupled to said up/down counter means for converting said count to an analog voltage substantially within said first range, said analog voltage being coupled to the other comparator input; clock means coupled to said up/down counter means for generating said clock signal at a selectable frequency in response to a selection signal; and delay means coupled to said clock means for generating said selection signal to a) select a first selectable frequency for said clock signal when said anti-slosh circuit is first activated and for a predetermined delay thereafter, and b) select a second selectable frequency lower than said first selectable frequency after said predetermined delay, said delay means including a delay counter for counting transitions of said counting direction and wherein said predetermined delay ends when said delay counter reaches a predetermined count.