Patent ID: 6246942
Filing Date: 2001-06-12
Classification: F16H,Y10T

Abstract:
A system for evaluating vehicle, drive and operation parameters (5, 6, 7) of a vehicle in order to select and adjust by means of a microprocessor (8) a speed ratio of a gear (4) according to predetermined calculation rules, characteristic values or characteristic fields, wherein from the change of a number of revolutions of a drive train (1) having an engine (2) and a gear (4) corresponding to the vehicle speed, an acceleration (a) of the vehicle is computationally determined, characterized by the following features:with each speed ratio (i.sub.g) is associated a minimum dwelling time (.DELTA.t.sub.f) during which the speed ratio (i.sub.g) is not adjusted,with each speed ratio change (.DELTA.i.sub.g) is associated an adjustment time (.DELTA.t.sub.z) which in the average is required to adjust the gear by a speed ratio change (.DELTA.i.sub.g),from the dwelling time (.DELTA.t.sub.f) and the adjustment time (.DELTA.t.sub.z) changes in the number of revolutions ((.DELTA.n.sub.b, .DELTA.n.sub.z) of said engine (2) are calculated during said times taking into account the vehicle acceleration (a),with the changes in number of revolutions (.DELTA.n.sub.b, .DELTA.n.sub.z), departing from a number of revolutions (.DELTA.n.sub.f) on a drive line (17) with the same performance (P) and optimum specific fuel consumption, a shift number of revolutions (n.sub.shift) is determined which lies between an economy drive range (18) and the maximum or minimum authorized number of revolutions anda set speed ratio (i.sub.set) is calculated from a real speed ratio (i.sub.real) multiplied by the ratio of the number of revolutions (n.sub.f) on the drive line (17) to the shift gear number of revolutions (n.sub.shift) and a possible speed ratio (.DELTA.i.sub.g) is selected.