Pulley slip control for continuous variable transmissions

• Main Authors: LOEFFLER BERND, CICHY JOACHIM, HENGSTLER HANS-DIETER
• Format: Patent
• Language: English
• Published: 20.08.2002
• Edition: 7
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

Within the scope of the process for variator slip treatment in continuously variable automatic transmissions of a motor vehicle, upon detection of variator slip, a characteristic field (1) of slip meter is locally incremented according to ratio value (iv) and to engine torque (M_mot) and simultaneously an evaluated slip meter (2) of an evaluation module (3), likewise according to ratio value (iv) and to engine torque (M_mot), is increased, wherein via the evaluation module (3), the variator slip is assessed according to duration and intensity. Besides, a characteristic field (4) of slip status meter connected with the evaluated slip meter (2) is incremented together with the evaluated slip meter (2), a signal being passed on to an error memory (5) so that, with the entry of the error, slip, evaluated slip and slip status meter are entered in the error memory (5) as environmental conditions. Thereafter the contact pressure security is locally varied according to the characteristic field (4) of the slip status meter.