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An automotive vehicle residual-fuel meter uses a microcomputer into which a signal indicating initial fuel tank liquid level is set. The initial setting is reduced in response to fuel consumption pulses derived from a ball-oscillation flow meter. The computer drives a residual fuel indicator. To inc

An automotive vehicle residual-fuel meter uses a microcomputer into which a signal indicating initial fuel tank liquid level is set. The initial setting is reduced in response to fuel consumption pulses derived from a ball-oscillation flow meter. The computer drives a residual fuel indicator. To increase the residual fuel quantity indication accuracy, a plurality of fuel level sensors, such as thermistors, correct the residual fuel indicator.

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A residual-fuel meter for an automotive vehicle, which comprises: (a) initial fuel setting means for presetting the initial quantity of fuel within the fuel tank; (b) consumed-fuel measuring means for measuring the fuel consumed from the fuel tank; (c) a microcomptuer for storing the quantity of ini

A residual-fuel meter for an automotive vehicle, which comprises: (a) initial fuel setting means for presetting the initial quantity of fuel within the fuel tank; (b) consumed-fuel measuring means for measuring the fuel consumed from the fuel tank; (c) a microcomptuer for storing the quantity of initial fuel preset by said initial fuel setting means and the quantity of consumed fuel measured by said consumed fuel measuring means and for calculating the quantity of residual fuel by subtracting the consumed fuel quantity from the initial fuel quantity; and (d) a residual fuel indicator for displaying the residual fuel quantity calculated by said microcomputer; said consumed-fuel measuring means for measuring the fuel consumed including a ball oscillation flow meter comprising: (a) a cylinder bore; (b) a ball movably disposed within said cylinder bore, the specific gravity of said ball being almost the same as that of the fuel, said ball being moved in the same direction as that of fuel flow; (c) a pair of position sensors including light-emitting elements and light-receiving elements for respectively deriving signals whenever said ball blocks the light emitted from said light emitting elements at either end of said bore; (d) a two-way valve for reversing the direction of fuel flow in response to the signals derived by said position sensors; and (e) a counter for counting the number of the signals from said position sensors to measure the quantity of flow.