And improvements regarding vehicle management devices

A monitoring device vehicle (10) comprising a microprocessor programmed to simulate a power train of a vehicle and arranged to receive signals from the management system of the engine (12) of a vehicle to produce a simulated model realtime operation powertrain vehicle where the fuel and / or the instantaneous and actual emissions of the vehicle can be accurately predicted during operation of the vehicle and compared with features of optimum performance preset for the power train in conditions associated to show operating conditions instant relative to the optimum point in all driving conditions, wherein the monitoring device vehicles (10) has a screen (18) including an indicator of engine speed (25, 26) arranged to display the current instantaneous velocity indicates engine with tions (20, 22) that refer to what engine speed should the driver to switch to a higher or lower gear under the prevailing conditions and the monitoring device vehicle (10) is programmed to calculate an indicator acceleration from energy demand (.DELTA.E) to produce an indication of the vehicle acceleration or throttle position and is provided with a screen acceleration (28), wherein the display acceleration indicates energy demand (.DELTA.E) in engine and includes a symbol (32) which is arranged to occur when exceeded a predetermined energy demand (.DELTA.E) to indicate to the driver that reduces the throttle opening.