1. Field of the Invention
The present invention, relates to a device designed to show the driver at any time whether the vehicle is operating economically or not.
2. Description of the Prior Art
Among the known devices which function similar to the present invention and are commercially available are those known devices which measure the vacuum in the motor inlet manifold. But this measurement lacks precision and the readout is difficult to interpret.
Those economizers that are attached to the carburetor are not adaptable to the new fuel injected motors. Thus, they are of interest for only one category of vehicles, i.e. carburated vehicles.
Measurement and indication devices which measure the consumption of carburant are known. These sample several variables such as the speed of the motor or of the vehicle, the gas butterfly valve opening and the selected gear ratio. But these are instruments which give a composite indication of the consumption calculated as an aggregate of the preceding information to be displayed on the dash board in a numerical or analog form. In other words these indicators inform the driver of the average instantaneous consumption, but do not give precise indications as to the time of and cause for overconsumption and the means necessary to remedy such situations.
In effect when a measurement instrument gives quantitative information more precise than a simple alarm signal, the driver is not able to see or can only poorly interpret the many instrument readings, as he is preoccupied with driving the vehicle.