Tachometer with economy indicator

摘要

The instrument indicates the actual engine speed by a pointer (12), and speed ranges, by means of green, yellow (or white) and red light emitting diodes or small displays (13). The displays are addressed by an output unit driving only those areas relevant to the particular engine. The optimum engine speed, in relation to operational parameters and accelerator pedal position, is denoted by a brighter illumination (15). A correspondingly higher speed range can be shown for engine braking. The output unit is connected to a fuel metering electronic calculator which allows recognition of attainment of the most economical speed, and an indication of the maximum engine braking speed.