摘要:
For a CVT it is proposed to determine an operating point from the number of revolutions of the primary disc (12) and the number of revolutions of the secondary disc (13). The operating point is assigned to a first characteristic field which has ranges of unauthorized ratios and one range of authorized ratio. If an error occurs, the pressure level in the adjustment area of the secondary disc (pSEK) is increased in a first step. If the error continues an emergency program is activated in a second step.
摘要:
A method of automatically engaging a parking lock of an automatic or automated transmission of a motor vehicle, which can be engaged by way of a selector device depending on a drive position selected by the driver of the motor vehicle and depending on other operating parameters. In order to achieve as little restriction of the drivability of the motor vehicle as possible, without neglecting the safety of the driver and the surroundings, five different variation of an Auto-P function are proposed for automatically engaging the parking lock: two of these variations are associated with an electrically interrupted ignition circuit of the motor vehicle; two variations are associated with an electrically closed ignition circuit and a simultaneously stopped vehicle drive motor and one variations is associated with an electrically closed ignition circuit and a simultaneously operating drive motor.
摘要:
A method for control of a gear step change in a vehicle having a dual clutch transmission (2) actuatable by a prime mover (4), several gear steps in which a first dividing gear (6) and a second dividing gear (10) can be operatively coupled with the prime mover (4), respectively, by a first clutch (8) and a second clutch (12) and both dividing gears (6, 10) have a common output (14) wherein each dividing gear (6, 10) preferably has several ratio steps and at least two consecutive gear steps of the dual clutch transmission (2) are not associated with the same dividing gear (6, 10). It is proposed that upon a demand for a double downshift, a gear step change occurs within the same dividing gear (6) without the other dividing gear (10) transmitting during the gear step change a torque from the prime mover (4) to the output, and that the torque delivered by the prime mover (4) during the gear step change is essentially used for the acceleration of rotary masses on the side of the prime mover.
摘要:
A hydraulic system for pressure control of a variator (7) of an automatic transmission having an electronic transmission control is connected with a lubricant circuit (10) in which at least one lubrication valve (14) and one radiator (13) are situated. Oil is fed to the hydraulic system with the lubricant circuit (10), from an oil source (4). At the same time, a hydraulic emergency device is provided which has at least one emergency valve (29) to provide a constant pressure ratio between a primary pulley set (19) and a secondary pulley set (20) of the variator (7). In addition, the system has for reducing the thermal load in the emergency operation at least one device (35, 37, 43, 45, 46, 51) by means of which in emergency operation the oil flow through the radiator (13) is increased and the pressure on one output side of the radiator (13) is reduced.
摘要:
The method for monitoring a continuously variable transmission (CVT) with a variator for adjustment of the speed ratio, which has its primary and secondary adjustment devices respectively controlled by a pressure-regulating valve, consists of a travel monitoring and/or pressure monitoring of the pressure-regulating valves wherein in case of detection of an incorrect operation the power-flow transmitting clutch is opened.
摘要:
A method for selecting a neutral position of a transmission and for selecting a parking device intended for immobilizing a vehicle, wherein the neutral position and the parking device can be engaged or actuated as a function of a position chosen by the driver on a selector device and as a function of other vehicle operating parameters. It is proposed that only if the vehicle has come approximately to a stop and simultaneously an ignition circuit acting on a driving motor of the vehicle is electrically interrupted and simultaneously a “Neutral” position is specified by way of the selector device, an N-holding phase, in which the transmission is in a neutral position having no frictional connection, can be activated by way of a separate control device provided in addition to the selector device, as long as an energy management system of the motor vehicle allows the activation of the N-holding phase.
摘要:
A multi-step automatic gearbox comprising a drive shaft (AN), a driven shaft (AB), a double planetary front mounted gearset (VS), a main gearset (HS) which is embodied as a coupled planetary gearset comprising at least three non-coupled input elements and an output element, in addition to six shift elements (A to F) and closing takes place in pairs enabling at least eight forward gears to be shifted therein. One input element of the front mounted gearset is connected to the drive shaft. One output element of the front mounted gearset rotates at a rotational speed which is slower than the rotational speed of the input of the drive shaft. One element of the front mounted gearset is secured to a gearbox housing (GG). The fifth and sixth shifting elements (E, F) together form a component comprising a disk support (ZYLEF) for the fifth and sixth shifting element and for the fifth and sixth shifting element, respectively, a disk packet (500, 600) and a servodevice (510, 610) which is used to activate the respective disk packets.
摘要:
A multi-speed automatic transmission comprises a drive input shaft (AN), a drive output shaft (AB), a double planetary transfer gearset (VS), a main gearset (HS) made as a coupled planetary gearset with at least three non-coupled input elements and one output element, and six shift elements (A to F), which, when engaged in pairs, enable at least eight forward gears to be engaged. An input element of the transfer gearset (VS) is connected with the drive input shaft (AN). An output element of the transfer gearset (VS) rotates at a speed slower than the input speed of the drive input shaft (AN). An element of the transfer gearset (VS) is fixed on a transmission housing (GG). The first input element of the main gearset (HS) can be connected via a second shift element (B) to the output element of the transfer gearset (VS), can be fixed by a third shift element (C), and can be connected with the drive input shaft (AN) by a sixth shift element (F). The second input element of the main gearset (HS) can be connected via a first shift element (A) to the output element of the transfer gearset (VS). The third input element of the main gearset (HS) can be fixed by a fourth shift element (D) and can be connected by a fifth shift element (E) to the drive input shaft (AN). The output element of the main gearset (HS) is connected to the drive output shaft (AB). The sixth shift element (F) is arranged axially between the transfer and main gearsets (VS, HS). A servomechanism (210) of the second shift element (B) is arranged mainly on the side of the transfer gearset (VS) facing away from the main gearset.
摘要:
The invention concerns a process for pressure actuation of a rotating shifting element of an automatic transmission or automated manual transmission, in which the shifting element is configured with a piston that interacts with a torque transfer element and a pressure medium supply, by way of which the piston can be actuated with pressure medium in order to be displaced into a positioned defined for an activated state of the shifting element, and in which a pressure pulse can be induced in the pressure medium supply in a de-activated state of the shifting element. It is proposed that the pressure medium pulse be triggered when the pressure medium amount drained from the de-activated shifting element has reached a predefined value.
摘要:
A multi-stage automatic transmission comprising a drive shaft (AN), a double planetary front mounted gear set (VS), a main gear set (HS) which is embodied as a coupled planetary gear set comprising at least three non-coupled input elements and an output element, in addition to six switch elements (A to F). Engagement of the six switch elements (A to F) takes place in pairs thereby enabling at least eight forward gears to be shifted. One element of the front mounted gear set (VS) is determined on a housing (GG). The second and the sixth shift element (B, F) form a component which is arranged on the side of the front mounted gear set (VS) which is oriented away from the main gear set (HS) and is arranged in an at least partially axial manner, between the front mounted gear set (VS) and a housing wall (GW), which is secured to the gear housing and which extends in a radial manner.