Patent ID: 6079536
Filing Date: 2000-06-27
Classification: F01P,F16D

Abstract:
A rotational speed arrangement for controlling the rotational speed of an output rotational part of a fluid friction coupling which is coupled with a driving rotational part by way of a shearing fluid whose effective shearing fluid quantity determines the transferrable torque, the arrangement comprising:a shearing fluid adjusting unit which can be electrically driven in a timed manner for variably adjusting the effective shearing fluid quantity;a temperature controller stage which receives temperature information (T.sub.K, T.sub.L, T.sub.R) of at least one media whose temperature can be influenced by the output rotational speed (n.sub.Li); anda rotational speed controller stage connected in cascade with the temperature controller stage and to which the output signal (n.sub.Ls) of the temperature controller stage is fed as the desired output rotational speed information, said rotational speed controller also receiving the actual output rotational speed information (n.sub.Li) and the driving notational speed information (n.sub.A),wherein the rotational speed controller stage, by way of an output signal (TV), drives the shearing fluid quantity adjusting unit,wherein the output rotational part is an engine fan coupled to a motor vehicle engine by way of the fluid friction coupling, the temperature information supplied to the temperature controller stage contains at least one engine-related actual temperature value (KT.sub.i, LT.sub.i, MT.sub.i), and the temperature controller stage determines from a fed rotational engine speed information (n.sub.M) and a fed engine torque information (M.sub.M), the engine power (P.sub.M) as a function of a characteristic diagram and determines therefrom as a function of the characteristic diagram, a desired temperature value (KT.sub.s, LT.sub.s, M.sub.s) pertaining to the respective fed actual temperature value.