摘要:
A method for shifting gears of an automatic transmission of a vehicle, by way of primarily form-locking shifting elements, while driving with or without utilization of a clutch depending on a decision made by a decision device which, in the presence of certain basic conditions, causes disengagement of a starting gear without disengaging the clutch, and subsequently reads in data about the size and the progression of a quantity correlating closely with the rotational speed of an output shaft of the automatic transmission and, with inclusion of this data, determines the shifting mode for engagement of the target gear.
摘要:
A method for shifting gears of an automatic transmission of a vehicle, by way of primarily form-locking shifting elements, while driving with or without utilization of a clutch depending on a decision made by a decision device which, in the presence of certain basic conditions, causes disengagement of a starting gear without disengaging the clutch, and subsequently reads in data about the size and the progression of a quantity correlating closely with the rotational speed of an output shaft of the automatic transmission and, with inclusion of this data, determines the shifting mode for engagement of the target gear. The method concerns early and slight adjustment of the clutch, preferably as a function of the degree of load reduction, just before determination of the shifting mode, without slippage of the clutch.
摘要:
A method for detecting a rotational direction of the secondary side of a starting clutch in a motor vehicle string comprising the steps of determination of the primary speed of rotation of the primary side and of the secondary speed of rotation of the starting clutch. If the secondary speed of rotation is greater than the primary speed of rotation, an actuator operates in a closing direction, whereby the degree of closure of the starting clutch is adjusted to be dependent upon the acceleration of the secondary speed of rotation. A specified value for a rotational speed of the driving motor is produced which represents the secondary speed of rotation. To the extent that this value exceeds the value of the primary rotational speed, the rotational speed of the motor is regulated to the specified value. If the primary and secondary rotational speeds are equivalent within a preselected period of time, then detecting the same rotational direction for the primary and secondary sides of the starting clutch. If the rotational speed of the primary side of the starting clutch lies below the idling speed of rotation, detecting different rotational directions for the primary side and the secondary side of the starting clutch.
摘要:
A device for controlling an automatic motor vehicle clutch is arranged between a driving enging and a transmission. This clutch operates primarily as a starting clutch and the engine torque TM and the rotational speeds before and after the clutch nM, nGE are detected or measured. A control device transforms an electric signal coming from an electronic control unit into a control value for the regulating device for the opening and closing of the clutch from the frequency and the amplitude of the engine speed and/or the transmission input speed, unacceptable vibrations (S) in the drive train betweeen the engine, clutch and transmission are detected and eliminated through a predetermined opening of the clutch. This opening takes place up to a path mark which is derived from a characteristic curve stored in an electronic control unit. For this purpose, during each starting process, in the reversal point UP of the rotational speed of the engine nM the corresponding engine torque TM and path marks WM from the coupling path are stored and the characteristic curve is computed and continuously renewed through running measurements and is improved as a result of the frequent measurements.
摘要:
A method of operating a drive-train which comprises a drive aggregate, a transmission and a starting clutch connected between the drive aggregate and the transmission such that during rolling and coasting, in a thrust operation, the drive-train is operated in such manner that a target value for the position of the clutch is determined as a function of a transmission input speed. The target value for the position of the clutch is compared with a corresponding actual value and, on the basis of the deviation between the target and actual values, a control parameter is generated for adjusting the clutch. The target value for the position of the clutch, during rolling and coasting, is determined in such manner that for a defined value of the transmission input speed, a target value is determined for the position of the clutch when rolling which is different from that determined when coasting.
摘要:
A shift control method for an automated gearshift transmission arranged in a drivetrain of a motor vehicle, between a drive motor and an axle drive, which is provided with unsynchronized gear clutches and whose input shaft can be connected to the driveshaft of the drive motor by an automatically controllable separator clutch such that, for an upshift, the synchronization of the target gear takes place with the separator clutch disengaged by setting a substantially constant braking torque at a transmission brake in driving connection with the input shaft. In order to speed up the shift sequence, without additional design measures, as the input speed of the gear clutch of the target gear approaches its output speed, to complete the synchronization, the separator clutch is partially engaged and then disengaged again substantially simultaneously as the transmission brake is released.
摘要:
An automatic transmission control method in which at least one of a starting clutch, a clutch coupling and transmission elements, for selection as well as engagement and disengagement of a gear step, are determined as a function of respectively existing variables representing the driving situation as well as the driver's wishes can be activated by actuators which are controlled by a control and regulation device. The method comprising the steps of collecting and normalizing the input variable into standard input variables; weighting with weighting factors and summarizing; converting the weighted input variables into intermediate variables; selecting a specific range of values which represents a specific shifting sequence; and implementing the shifting operation.
摘要:
Method for identifying a passive rolling moment of a motor vehicle (1), for example an undesired rolling moment with which the vehicle (1) starts moving in a direction opposite to a direction of travel in relation to a selected speed. According to the method, a mechanism detects reverse rotational directions of a secondary side (11) of an automatic starting element (4) which is connected to a transmission input shaft (12) of a variable speed transmission (3) in relation to a primary side (9) of the start-up element (4) connected to a driving shaft (10) of a drive engine (2), a transmission oil pump (16) which delivers independently of the rotational direction being associated with the variable speed transmission (3). The method and device provide a simple and inexpensive way for identifying reverse rotational directions close to the beginning of a starting process. For this purpose, the number of revolutions of the transmission input shaft (12) and the oil pressure in the variable speed transmission (3) are detected in a time-resolved manner and subjected to a correlation examination by way of which unequal rotational directions of the primary side (9) and of the secondary side (11) of the starting element (4) are detected when there is insufficient correlation and, as a result, drive-related measures are taken to counteract an identified undesired passive rolling moment. A device for carrying out the method is also disclosed.
摘要:
A method for operating a drive train having a variable speed transmission connecting a drive unit with an output drive. The transmission has gears that can be selected by the driver and has a clutch that can be manually actuated. The torque intended by the driver is determined based on accelerator pedal actuation and the drive unit is operated on that basis. Whenever the driver disengages the clutch and changes gears, the torque intended by the driver is not used for operating the drive unit, rather the drive unit is automatically operated by a rotational speed control. In a first phase rotational speed control, a target value is automatically determined, that is independent of the current transmission input speed, and used for the rotational speed control. During a second phase, a target value which is dependent on the current transmission input speed is used for the rotational speed control.
摘要:
A method of operating a drive-train which comprises a drive aggregate, a transmission and a starting clutch connected between the drive aggregate and the transmission such that during rolling and coasting, in a thrust operation, the drive-train is operated in such manner that a target value for the position of the clutch is determined as a function of a transmission input speed. The target value for the position of the clutch is compared with a corresponding actual value and, on the basis of the deviation between the target and actual values, a control parameter is generated for adjusting the clutch. The target value for the position of the clutch, during rolling and coasting, is determined in such manner that for a defined value of the transmission input speed, a target value is determined for the position of the clutch when rolling which is different from that determined when coasting.