Instrument for indicating the kilometric fuel consumption of a motor vehicle provided with an injection feed explosion engine

Claim 1

A device for indicating the kilometric fuel consumption of a motor vehicle with an internal combustion engine having an injection fuel feed system, comprising in combination, regulation means sensitive to the power supplied by the engine and delivering an electric signal proportional to the quantity of fuel fed at each engine cycle, indicating means operatively connected to said regulation means for providing an indication of the kilometric fuel consumption of the motor vehicle, said indicating means having at least one indicating scale graduated in quantities of fuel delivered for a predetermined distance traveled by said vehicle when a predetermined gear is engaged, said regulation means comprising a three-dimensional cam, a follower engaging the cam surface, and a mechanical-electrical transducer of potentiometric type supplied with direct current and operatively connected to the follower, said cam being axially and angularly displaceable as a function of two engine operating parameters, the lifts of said cam representing the fuel requirements of the engine in the different operating conditions, the voltage across said potentiometric transducer being proportional to the quantity of fuel fed at each engine cycle and actuating the indicating means to supply the indications of the motor vehicle kilometric fuel consumption on the indicating scale relating to the engaged gear.

Claim 2

A device for indicating the kilometric fuel consumption of a motor vehicle with an internal combustion engine having an injection fuel feed system, comprising in combination, regulation means sensitive to the power supplied by the engine and delivering an electric signal proportional to the quantity of fuel fed at each engine cycle, indicating means operatively connected to said regulation means for providing an indication of the kilometric fuel consumption of the motor vehicle, said indicating means having at least one indicating scale graduated in quantities of fuel delivered for a predetermined distance traveled by said vehicle when a predetermined gear is engaged, said regulation means comprising a three-dimensional cam, a follower engaging the cam surface, and a mechanical-electrical transducer of potentiometric type supplied with direct current and operatively connected to the follower, said cam being axially and angularly displaceable as a function of two engine operating parameters, the lifts of said cam representing the fuel requirements of the engine in the different operating conditions, the voltage across said potentiometric transducer being proportional to the quantity of fuel fed at each engine cycle and actuating the indicating means to supply the indications of the motor vehicle kilometric fuel consumption on the indicating scale relating to the engaged gear.