METHOD FOR CONTROLLING AN AUTOMATED MULTI-STEP VARIABLE SPEED TRANSMISSION FOR THE DETECTION OF ERROR, AND ONE SUCH TRANSMISSION

摘要

The invention relates to a method (60; 80) for controlling an automatic multi-step variable speed transmission (16), in particular for motor vehicles, wherein said multi-step variable speed transmission (16) comprises a plurality of gear steps (24, 26, 36, 38), each of which sets up another transmission ratio, comprising the following steps consisting: a) in detecting (S1; T1, T3), whether a gear step (24, 26, 36, 38) is applied, b) in detecting (S2; T4) a real input value (nSUBE/SUB), which is substantially proportional to an input rotation speed (nSUBE/SUB) of the multi-step variable speed transmission and an output real value (nSUBA/SUB) which is substantially proportional to an output rotation speed (nSUBA/SUB) of the multi-step variable speed transmission, c) in verifying (S3; T4) whether a difference (SUB?/SUBR) between the ratio of the real input and output values (nSUBE/SUB, nSUBA/SUB) and the transmission ratio defined by the gear step (24, 26, 36, 38) is less than a predefined tolerance range (?RSUBMAX/SUB) for a predefined span of time (tSUB2/SUB-tSUBl/SUB) and d) in determining (S4; T5-T7) an error condition in the case when the difference (?R) is not situated within said tolerance range (?RSUBMAX/SUB) for a predefined span of time (tSUB2/SUB-tSUBl/SUB).