System for evaluating vehicle drive and operation parameters

Abstract

The invention concerns a system for evaluating vehicle, drive and operation parameters of a vehicle to select and adjust by means of a microprocessor a speed ratio of a gear according to predetermined calculation rules, characteristic values and characteristic fields wherein an acceleration of the vehicle is mathematically calculated from a number of revolutions of a drive train comprising engine and gear, the number of revolutions corresponding to the driving speed. The problem is to provide for different gear types a uniform system which requires only a few parameters adapted to the vehicle for selecting speed ratio and gear shift. This is attained by the fact that a minimum dwelling time (&Dgr;t,) is associated to each speed ratio range. To each change of speed ratio (i,) is further associated an adjustment time (&Dgr;t,) which in the average is required for the gear to complete a speed ratio change (&Dgr;i,). From the minimum dwelling time (&Dgr;t,) and the adjustment time (&Dgr;t,) is calculated, taking into account the vehicle acceleration (a), a change in number of revolutions (&Dgr;n,, &Dgr;n,) of the engine during said times. The speed ratio change (&Dgr;i,) to be carried out is calculated from a set number of revolutions (n,) or a gear shift number of revolutions (n,), and is carried out when the real number of revolutions (n,) reaches or exceeds the gear shift number of revolutions (n,)