Patent ID: 6497636
Filing Date: 2002-12-24
Classification: B60W,F16H,Y10T

Abstract:
A method for controlling a driving engine/transmission unit having a continuously variable automatic transmission, in which the transmission output torque acting upon the driving wheels of a vehicle and the engine reaction torque retroacting upon the driving engine can be adjusted via a regulated transmission variable, said method comprising:predefining a desired transmission output torque and determining the regulated transmission variable; determining a desired transmission output power from the desired transmission output torque; calculating a transmission power loss; determining an engine power requirement of the driving engine from the desired transmission output power and the transmission power loss; determining a desired engine torque and a desired rotational engine speed from the power requirement of the driving engine; and at least one of performing a torque regulator operation by determining a corrected desired engine torque with one of a predefined regulated transmission variable and a corrected desired transmission output torque, in conjunction with a change of the regulated transmission variable for controlling the rotational engine speed; and performing a transmission ratio regulator operation by determining a desired transmission ratio and a desired engine torque while the regulated transmission variable is changed, such that a determined actual transmission ratio corresponds to the calculated desired transmission ratio.