Method and arrangement for controlling actual torque in a land vehicle driveline

Abstract

Method and arrangement for controlling actual torque in a driveline of a land-based motor vehicle. Taking a direct, non-predictive measure of actual torque induced in the driveline of the motor vehicle and ascertaining a magnitude thereof. Ascertaining a magnitude of a torque demand being requested to be instituted in the driveline. Comparing the ascertained magnitude of the direct, non-predictive measure of actual torque taken is compared with a driveline-configuration dependent maximum torque threshold; in this way, an over-threshold torque condition is ascertained in the driveline based thereupon if such a condition exists. In multi-geared transmissions, the variability can be accounted for through the engagement of different ratio gears. In the event that such an over-threshold torque condition is detected, at least one of several possible over-threshold torque compensating effects will be applied to reduce or diminish the excessive portion of the torque. The remedial measure may be chosen from several possibilities including reconfiguring the variable ratio transmission and / or reducing powerplant-induced driveline torque.

Description

technical field [0001] The present invention relates to a method and apparatus for controlling torque in a vehicle transmission system; more particularly, the present invention relates to a control system and control method based on a predetermined threshold torque magnitude and a measurement directly from the transmission system The resulting actual torque, adjusts the amount of torque that is allowed to be applied from the powerplant to the vehicle driveline. Background technique [0002] All vehicle transmissions are designed to operate safely at maximum input torque levels. More precisely, for each individual gear ratio of a given transmission, a maximum torque value can be defined. Obviously, different gear ratios of the transmission can have widely different actual torque capacities. For example, with a direct gear (ie, 1:1), the torque is usually not transmitted through the meshing gears; the torque is transmitted directly through the transmission, not through the c...

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Problems solved by technology

However, this method is not practical when the mass of the vehicle cannot be determined with sufficient precision, such as a freight truck, whose mass depends on the amount of goods it transports, which can vary widely

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