Patent ID: 6558294
Filing Date: 2003-05-06
Classification: B60W,F16H,Y10T

Abstract:
A process for the control of an automated gearbox for an engine upon kickdown, the process comprising:calculating a target running speed of a vehicle having the gearbox based on a current running speed of the vehicle; determining possible gear combinations for changedown; determining an accelerative drive force for each possible gear combination on the basis of a maximum drive force for each possible gear combination, a maximum engine torque at a current engine speed, and a calculated running resistance of the vehicle; calculating acceleration for positive accelerative drive force by estimating a weight of the vehicle, and calculating acceleration times for increasing the running speed of the vehicle by a specified value for each possible gear combination; controlling the engine speed corresponding to the target running speed based on a permissible maximum engine speed; and comparing the acceleration times for the possible gear combinations to determine a shortest acceleration time and emitting a signal to the gearbox for changing to the gear combination which results in the shortest acceleration time.