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A vehicle fuel economy calculator including a digital circuit for generating a first series of pulse groups with the number of pulses in each group representing a calculation of instantaneous vehicle fuel economy. A digital averaging circuit generates a second series of pulse groups with the number

A vehicle fuel economy calculator including a digital circuit for generating a first series of pulse groups with the number of pulses in each group representing a calculation of instantaneous vehicle fuel economy. A digital averaging circuit generates a second series of pulse groups with the number of pulses in each group representing an average vehicle fuel economy determined by the average number of pulses in each pulse group in a predetermined number of consecutive pulse groups in the first series. A gating and indicating circuit is responsive to the vehicle speed and fuel consumption rate for providing an indication of zero fuel economy when the vehicle speed is below a predetermined speed, for coupling the first series of pulse groups to the indicator during a specified period of time after the vehicle reaches the predetermined speed or when the fuel consumption exceeds a predetermined rate, and for coupling the second series of pulse groups to the indicator circuit at all other times.

대표청구항 ▼

A vehicle fuel economy calculator comprising: a flow transducer for generating fuel flow pulses having a frequency proportional to vehicle fuel flow rate; a speed transducer for generating speed pulses having a frequency proportional to vehicle speed; means responsive to the fuel flow pulses and the

A vehicle fuel economy calculator comprising: a flow transducer for generating fuel flow pulses having a frequency proportional to vehicle fuel flow rate; a speed transducer for generating speed pulses having a frequency proportional to vehicle speed; means responsive to the fuel flow pulses and the speed pulses for generating a first series of pulse groups, the number of pulses in each pulse group in the first series representing the instantaneous vehicle fuel economy; a plurality of digital up/down counters, each of the counters having data inputs and data outputs and being presettable to a digital number applied to its data inputs; a plurality of memory circuits, the numBer of memory circuits being one less than the number of up/down counters; means coupling each memory circuit between the data inputs and outputs of a respective pair of up/down counters to form a series of up/down counters interconnected by the memory circuits; a divider for dividing the number of pulses coupled thereto by the number of up/down counters and supplying a number of pulses equal to the quotient; means for coupling the first series of pulse groups to the divider, the divider supplying a second series of pulse groups, the number of pulses in each pulse group in the second series representing the instantaneous vehicle fuel economy divided by the first number; means for counting up the first up/down counter in the series of up/down counters with the pulses in the second series of pulse groups to generate a digital number representing the number of pulses counted; and means after each pulse group in the second series for sequentially enabling each memory circuit to memorize the digital number at the up/down counter data outputs coupled therewith and to apply the memorized digital number to the up/down counter data inputs coupled therewith, totalizing the digital numbers in the up/down counters, and presetting each of the up/down counters to the digital number applied to the data inputs thereof, the means for totalizing the digital numbers in the up/down counters including means for counting down each of the up/down counters to zero in succession, whereby the totalized digital numbers represents an average vehicle fuel economy.