Abstract:
A hydraulic control apparatus for an automatic transmission has a circulating oil supply passage that supplies circulating oil to a starting apparatus, a circulating oil discharge passage that discharges circulating oil from the starting apparatus, and a speed change mechanism oil supply passage that supplies oil to a speed change mechanism. The oil discharged from an oil pump is supplied to the starting apparatus and the speed change mechanism. A first flow rate changing device that can change the flow rate of the circulating oil is arranged in the circulating oil discharge passage. A first flow rate instructing portion output a command to the flow rate changing device to change the flow rate when the amount of oil discharged from the oil pump is low, and reduces the flow rate to the starting apparatus, which enables the hydraulic pressure necessary for shifting to be obtained in the speed change mechanism.
Abstract:
The invention relates to an electronic-hydraulic control device of an automatic automobile transmission comprising hydraulic engaging and disengaging friction clutches or brakes (A, B, C, D, E) for shifting individual gear steps and an electronic control device (32) that is connected to a selector lever by means of an electric linkage in the automobile and that changes gears depending on the selection of the selector lever and given parameters of the internal combustion engine and the transmission. During outage of the electronic control device (32) and currentless switching of all solenoid valves (11, 12, 15, 16), an emergency gear in forward movement is maintained until the internal combustion engine is turned off and a parking brake is then automatically engaged. During outage of the electronic transmission control (32) in reverse gear, all clutches or brakes are switched without pressure and the parking brake is engaged automatically. A valve (17) that automatically engages an emergency forward gear and simultaneously releases a parking brake is switched over by manually actuating a lever (36). The release of the parking brake and the forward gear are maintained until the internal combustion engine is stopped.
Abstract:
The invention concerns an automatic clutch (2) between a motor vehicle engine (1) and drive train with a manually shifted gearbox (3) disposed on the clutch output side. Rotational speed differences between the clutch input and output detected by sensor technology are taken into consideration when the clutch (2) is engaged. If the signals from the sensing elements for the rotational speed on the output side fail, replacement signals are calculated from other parameters.
Abstract:
The invention concerns a system for controlling devices which are disposed between a vehicle engine and the vehicle wheels and, in response to a control signal, can at least reduce the flow of power between the vehicle engine and the wheels. In this respect, the vehicle engine is controlled or regulated by an engine control system. The essence of the invention is that the control signal is formed in dependence on an error detected in the engine control system. In particular, the object of the invention is to interrupt the flow of power from the vehicle engine to the wheels when emergency switching-off of the engine causes a high braking torque at the wheels and hence a driving state which is critical from the safety aspect. The devices according to the invention are in particular a clutch connected downstream of the engine, an automatic or automated transmission and/or a converter-bridging clutch which can bridge a torque converter connected downstream of the vehicle engine.
Abstract:
A method of shifting in a manual mode of an electronically-controlled automatic transmission system (10) includes the steps of determining whether a shift lever of a shift lever mechanism (14) is presenting a position error (101) when the shift lever is in a manual position, determining whether at least one switch (103) on the shift lever mechanism is presenting an error if a shift lever position error is not determined, determining whether a temperature of an automatic transmission or engine coolant temperature (108) exceeds a predetermined threshold if the at least one switch is not presenting an error, determining whether the manual position conditions have been met, determining whether an upshift or downshift of the automatic transmission (12) is scheduled if the manual position conditions have been met, and executing either an upshift or a downshift based on the determined upshift or downshift scheduled.
Abstract:
An electric-hydraulic control for an automatic gear box (1) has two gear input shafts (11, 12). The first input shaft (11) is linked to the turbine (21) of a hydrodynamic unit (2) and the second shaft (12) is directly linked to the driving shaft (31) of a driving motor (3). The input power is transmitted depending of each gear separately or as separated input power to a reduced planetary coupling gear, for example with a selecting slide (4) at least for the neutral position (N) as well as for the forward (D) and backward motion (R). The control also has an electronic control apparatus (5), magnetic valves (6) held in the neutral position by springs, a hydraulic pressure source (7), pressure and switching valves and dampers for activating gear separating clutches and brakes (A-E). An emergency valve (8/9) is arranged between a magnetic valve (6) and the separating clutches for the highest gear (E) and the backward gear (B). This allows to continue driving in case of power failure by mechanical transmission via the clutch (E), both forward and backward, as well as starting in both these directions, via the backward gear clutch (B).
Abstract:
Verfahren zum Betrieb eines Antriebsstrangs eines Kraftfahrzeugs bei einer Schaltung in einem unsynchronisierten Hauptgetriebe eines Mehr-Gruppengetriebes. Die Erfindung geht aus von einem Verfahren zur Durchführung einer Schaltung in einem unsynchronisierten Hauptgetriebe, bei welchem die Synchronisation mittels einer Antriebsmaschine erfolgt. Es ist Aufgabe der Erfindung ein Verfahren vorzuschlagen, welches ein Einlegen eines Zielgangs auch in einem Notbetrieb der Antriebsmaschine ermöglicht. Erfindungsgemäss werden folgende Schritte ausgeführt: - Öffnen der Kupplung (12), - Einstellen einer Neutralstellung in der Nachschaltgruppe (19), - Einlegen des Zielgangs, - Einstellen einer Fahrstellung in der Nachschaltgruppe (19) und - zumindest teilweises Schliessen der Kupplung (12). Einsatz in einem Kraftfahrzeug.
Abstract:
The invention relates to a control valve arrangement for controlling a start coupling of an automatic gearbox, comprising a clutch control valve (3, 37, 41, 48, 49) for controlling at least one clutch actuating device (4, 40), which during normal operation of the gearbox converts a supply pressure input (P_V1, P_V2) into a clutch actuation pressure (P_K, P_K1, P_K2) according a pre-control pressure (P_VST, P_VST1, P_VST2) or an electric pre-control signal (S) in order to control the clutch actuation device (4, 40). In order to ensure emergency operation of the gearbox, an activating pressure (P_A) can be supplied to the clutch control valve (3, 37, 41, 48, 49) or directly to the clutch activation device (4, 40) in the event of discontinuation of the pre-control pressure (P_VST, P_VST1, P_VST2) or pre-control signal (S) according to the engine and gearbox output speed, whereupon the clutch actuation device (4,40) is maintained in a closed position as long as the above-mentioned speed remains above a predetermined limit.
Abstract:
Disclosed herein are systems and methods of controlling the pressure in a modulation pressure circuit through transmission fluid through an orificed check valve supplementary or in substitution of a computer-controlled pressure regulation solenoid. Also disclosed herein is a transmission modification kit including an orificed check valve (50) having a seating portion (53), a spring fitting (71) and an orifice (51) in combination with a substitutionary component (88) having similar characteristics to those of a disabled regulating solenoid. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.