Abstract:
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 (n E ), which is substantially proportional to an input rotation speed (n E ) of the multi-step variable speed transmission and an output real value (n A ) which is substantially proportional to an output rotation speed (n A ) of the multi-step variable speed transmission, c) in verifying (S3; T4) whether a difference ( ? R) between the ratio of the real input and output values (n E , n A ) and the transmission ratio defined by the gear step (24, 26, 36, 38) is less than a predefined tolerance range (?R MAX ) for a predefined span of time (t 2 -t l ) and d) in determining (S4; T5-T7) an error condition in the case when the difference (?R) is not situated within said tolerance range (?R MAX ) for a predefined span of time (t 2 -t l ).
Abstract:
The invention relates to a method for increasing the spontaneity of an automatic gear with overlapping gears. Upshifting from a first to a second gear is only partially completed and a changeover to a lower gear occurs when an abort criterion is met.
Abstract:
The invention concerns a method of determining the parameters of an electrohydraulic automatic transmission (4), wherein, on the final test bench, gear shifts into the individual multiplication stages of the automatic transmission are initiated in succession. During gear changes, the parameters of the automatic transmission are determined from the measured values transmission input/transmission output speed (10, 12) and transmission input/transmission output moment (11, 13).
Abstract:
A shift by wire transmission system enables a driver to manually select a next desired gear and the system completes the shift automatically without requiring the driver to operate the clutch. The system includes an electronic transmission control unit that communicates with an electronic engine control unit (20) to control engine speed during a shift in order to synchronise the speed of an engine shaft (23) and the transmission shaft. The driver manually chooses a gear shift by moving a shift lever (12) to thereby produce electrical signals indicative of the desired change in gears. Multiple or skip shifting is possible along with a method of automatically choosing a default gear in the event that the vehicle transmission is placed in neutral while the vehicle is in motion.
Abstract:
The proposal is for a gear control for reducing the thermal stress on switching components (2, 3, 4, 5, 6) of a reversing gear (1) for machines having an input shaft (8) and an output shaft (15) and at least one reversing switch for forward motion (2) and one for reverse movement (3) and a downstream load-switchable gearing set (4) with several switching components (5, 6) allocated to a gear. Here, the switching components (2, 3, 5, 6) can be electrically and/or hydraulically controlled by a regulating and control device (12) in a such a way that, during a switching process, in addition to one of the reversing switching component (2, 3) corresponding to the switching procedure, at least one other switching component (5, 6) of the downstream switching set (4) lying in the power flow and closed at the start of a reversal is set to a frictional or slip state. The frictional load is thus distributed between the reversing component (2, 3) and the other slipping switching component (5, 6).
Abstract:
A multistep shifting gear-box, particularly for motor vehicles, comprises a main shaft (24) and two secondary shafts (241 and 242). On said shafts are arranged a number of groups of toothed wheels, each group having three toothed wheels in continuous meshing conditions. On the main shaft (24) there are arranged gear shifting sleeves (243, 244, 245, 246) for shifting the gears; one of said sleeves may be coupled by means of a form connection (by means of an actuating cylinder) to one of the toothed wheels. In order to obtain a synchronization with the gear shifting sleeve to be engaged, one of the secondary shafts is subjected either to an acceleration device (33) or to a deceleration device (36), according to the shifting direction. A control microprocessor controls according to the obtention of the synchronization to the gear shifting sleeve in question the servo medium supply to the actuation cylinder concerned.
Abstract:
A method for performing a shuttle shift with a transmission of a work vehicle is disclosed, wherein the transmission includes an input shaft, a counter shaft and a plurality of driven shafts extending generally parallel to the input and counter shafts. The method may include disengaging a clutch associated with a first directional gear of a directional shaft of the plurality of driven shafts. The first directional gear may be configured to rotate the directional shaft in a first direction. Additionally, the method may include engaging clutches associated with at least two gears of at least one secondary driven shaft of the plurality of driven shafts to reduce a rotational speed of the directional shaft and, after the rotational speed of the directional shaft is reduced, engaging a clutch associated with a second directional gear of the directional shaft such that the directional shaft rotates in a second direction.
Abstract:
Die Erfindung betrifft eine Anordnung von Positionsgebern an einer Schaltstange für automatisierte Geschwindigkeits-Wechselgetriebe in Kraftfahrzeugen, die mit gehäusefesten Positionssensoren einer elektrischen Gangerkennungsschaltung zusammenwirken, wobei die zumindest eine Schaltstange an ihren Endbereichen in Querwänden des Gehäuses des Wechselgetriebes verschiebbar gelagert und mittels einer elektrohydraulisch gesteuerten Gangstelleinheit betätigt ist. Eine montage- und fertigungstechnisch günstige Anordnung sieht vor, dass die Schaltstange (24) durch eine Durchgangsbohrung (20a) in einer ölraumtrennenden Querwand (20) des Wechselgetriebes (12) in einen zumindest die Gangstelleinheit (16) und die Positionssensoren (48, 50) aufnehmenden Getrieberaum (14) einragt und dass die Positionsgeber (40, 42, 44) an der Schaltstange (24) derart unmittelbar befestigt sind, dass die Schaltstange (24) mit den Positionsgebern (40, 42, 44) durch die Durchgangsbohrung (20a) hindurch als Montageeinheit montierbar ist.
Abstract:
Die Erfindung betrifft ein Kraftfahrzeug - insbesondere Nutzfahrzeug - mit einem Schaltklauengetriebe und einem Elektromotor. Der Elektromotor dient der zentralen Synchronisation bei Gangwechseln und ist an der Vorgelegewelle angeordnet. Mittels der Induktionsgrößen am Elektromotor ist die Vorgelegewellendrehzahl ermittelbar.
Abstract:
Verfahren zur Steuerung eines automatischen Getriebes eines Fahrzeuges mit Kupplungen, die durch eine elektronische Steuereinheit gesteuert werden, wobei das Verfahren die Schritte aufweist: Erfassen einer Getriebedrehzahl bei einer Anfangsgangstufe, Schalten von der Anfangsgangstufe in eine Zielgangstufe, falls eine erste Getriebeschaltdrehzahl erreicht ist und Erfassen einer Getriebezieldrehzahl der Zielgangstufe, wobei das Verfahren die weiteren Schritte aufweist:: Ermitteln eines Betrages einer Getriebedrehzahldifferenz aus Getriebe zieldrehzahl und einer zweiten Getriebeschaltdrehzahl, welche einen Betrag zwischen der ersten Getriebeschaltdrehzahl und der Getriebe zieldrehzahl aufweist, Bestimmen eines Startzählerwertes eines Zählers in Abhängigkeit vom Betrag der Getriebedrehzahldifferenz, Zähler vom Startzählerwert beginnend in Abhängigkeit von der Zeit zählen lassen und Schalten von der Zielgangstufe in Richtung zur Anfangsgangstufe, wenn der Zählerwert des Zählers den Wert Null erreicht hat.