Fuel consumption measuring device

Claim 2

A fuel consumption measuring device for measuring the amount of fuel consumed in an internal combustion engine of a type in which fuel and another gas are burned together at a certain ratio therebetween, comprising: a battery; revolutions signal generating means for generating a revolutions signal in synchronism with the revolutions of said engine; intake gas amount signal generating means for generating an intake gas amount signal corresponding to the amount of said gas drawn into said engine; a control circuit connected to said intake gas amount signal generating means and said revolutions signal generating means for generating a pulse signal in synchronism with said revolutions signal, said pulse signal having a pulse width proportional to said intake gas amount signal; and indication means, connected to said battery to be intermittently supplied with a constant voltage therefrom in response to and only during said pulse signal, for indicating the average rate of fuel consumption.

Claim 3

A device according to claim 1, wherein said intake gas amount signal generating means comprises pressure sensing means for detecting the pressure in a gas induction passage of said engine, and said control circuit comprises a multiplier circuit for multiplying an output signal of said pressure sensing means and said revolution signal together and generating an output signal corresponding to the instantaneous consumption of fuel.

Claim 4

A device according to claim 1, wherein said indication means comprises display means for indicating the instantaneous consumption of fuel.

Claim 5

A device according to claim 1, wherein said intake gas amount signal generating means comprises pressure sensing means for detecting the pressure in a gas induction passage of said engine.

Claim 6

A device according to claim 1, wherein said indication means comprises an ammeter and a transistor connected in series therewith for intermittently supplying said ammeter with the electric power in response to said pulse signal.

Claim 7

A fuel consumption measuring device comprising: a battery; revolutions signal detecting means for generating a signal in synchronism with the revolutions of an internal combustion engine; intake air amount detecting means for generating a signal corresponding to the flow of air to said engine varying in accordance with the operating conditions of said engine; a control circuit connected to both of said detecting means for measuring the amount of fuel consumed by said engine in accordance with the output signals of said detecting means; conversion signal generating means connected to said control circuit for integrating output signals of said control circuit whereby each time a resulting integrated value reaches a predetermined unit quantity of the consumption of fuel an integration operation is repeated to generate a conversion signal in synchronism with said integration operation; counting means connected to said conversion signal generating means for counting said conversion signal and memorizing the count value thereof with the constantly supplied electric power from said battery; and display means connected to said counting means and said battery through a key switch for displaying the fuel consumption amount in response to said memorized count value during the closure of said key switch.

Claim 8

A fuel consumption measuring device comprising: a battery; revolutions signal detecting means for generating a signal in synchronism with the revolutions of an internal combustion engine; intake air amount detecting means for generating a signal corresponding to the flow of air to said engine varying in accordance with the operating conditions of said engine; a control circuit connected to both of said detecting means for measuring the amount of fuel consumed by said engine in accordance with the output signals of said detecting means; conversion signal generating means connected to said control circuit for integrating output signals of said control circuit whereby each time a resulting integrated value reaches a predetermined unit quantity of the consumption of fuel an integration operation is repeated to generate a conversion signal in synchronism with said integration operation; counting means connected to said conversion signal generating means for counting said conversion signal and memorizing the count value thereof with the constantly supplied electric power from said battery; and display means connected to said counting means and said battery through a key switch for displaying the fuel consumption amount in response to said memorized count value during the closure of said key switch.