摘要:
A method for updating shift position thresholds for a multi-speed transmission is provided. The multi-speed transmission includes an input member for connection to a prime mover and an output member, the output member selectively couplable to the input member via a plurality of gear ratios, and a position sensor for providing data indicative of a position of a shift actuator for selecting between the plurality of gear ratios. The method includes: detecting a request to change the gear ratio between the input member and the output member; and subsequent to detecting the request to change the gear ratio, i) comparing a velocity of the output member to a prescribed velocity, ii) upon the velocity of the output member increasing and being less than the prescribed velocity, storing the position provided by the position sensor as a synchronization position, iii) upon the velocity of the output member corresponding to the prescribed value, storing the position provided by the position sensor as an endstop position, and iv) calculating a threshold position for the shift actuator based on the synchronization position and the endstop position.
摘要:
The invention relates to a hybrid drive having an automated conventional gearbox, for example for a motor vehicle, having an internal combustion engine (VM) which has a drive connection to at least a first transmission input shaft (W1), having an electric drive which has at least one electric machine (EM1) which has a drive connection to a second transmission input shaft (W3; W3′), having at least one layshaft (W4), having freely moving wheels and fixed wheels (z11-z17, z21-z29, zR3) which are arranged in a plurality of wheel set planes (Z1-Z7), having a plurality of gear shift devices (S1-S4), and having a transmission output shaft (W2). In order to permit a high degree of variability in terms of a wheel set concept as well as the distribution and the number of electrical and internal-combustion-engine gearspeeds, to keep the expenditure on design and the costs low and to ensure efficient and comfortable operation, there is provision that the two transmission input shafts (W1, W3; W1, W3′) are arranged coaxially with respect to one another, and in that in one of its shifted positions a gear shift device (S1) connects the two transmission input shafts (W1, W3; W1, W3′) to one another effectively in terms of drive, and in another shifted position shifts a gearspeed.
摘要:
A method controls synchronization of a pinion rotating on a primary shaft driven by a traction machine of a vehicle and rotatably connected to a secondary shaft of a parallel shaft gearbox without synchronization mechanisms. The method includes sending to the traction machine, before coupling of the pinion on the primary shaft, a torque command which depends on a torque signal calculated to minimize a difference between a primary speed and a secondary speed multiplied by a reduction ratio between the primary shaft and the secondary shaft. The calculated torque signal is limited in amplitude when the speed difference is greater in absolute value than a desired accuracy on the targeted primary speed upon completion of the synchronization. The calculated torque signal is saturated on a maximum or minimum torque of the traction machine if the calculated torque signal is not between the maximum or minimum torque.
摘要:
After engagement of a clutch is suppressed from being started and a rotational speed of an input shaft of an automatic transmission is suppressed from being increased due to an increase in rotation resistance of the input shaft of the automatic transmission, which occurs by half-engagement of a clutch, the clutch is disengaged, and the clutch is completely engaged. In this way, the clutch is completely engaged after the rotational speed of the input shaft is suppressed from being increased. Thus, a heat generation amount of the clutch can be reduced, and furthermore, durability of the clutch can be improved by a reduction in the heat generation amount.
摘要:
A control apparatus for an automatic transmission includes a vehicle speed detector and a controller. The vehicle speed detector is configured to detect a vehicle speed. The controller is configured to set one of a plurality of gear change stages according to a running condition of a vehicle and configured to select one of a plurality of engagement combination states of a plurality of engagement mechanisms to achieve, according to the vehicle speed detected by the vehicle speed detector, at least one gear change stage out of the plurality of gear change stages in a case in which the controller sets the at least one gear change stage. The at least one gear change stage has the plurality of engagement combination states to achieve the at least one gear change stage.
摘要:
A method of optimizing shifting of a shifting element which fixes a shaft to another component of the drive-train. Three shifting processes are influenced by respective characteristic forms of a control parameter. The first and second characteristic forms are different from one another. Each shifting process has a distinct start and end time (tBeginn, tEnde). The rotational speed of the shaft is a function n(t) of time t. An idealized rotational speed nideal(t):=G{n(t)} is determined by a filter G. First and second evaluation indexes I:=I(t−Δt,t)/I (tBeginn−t, tBeginn) are calculated, in which tBeginn
摘要:
The invention relates to a method for changing gear stages in a transmission having a hydrostatic transmission and a downstream manual transmission, and a corresponding transmission arrangement. First, a desire to shift is detected within the manual transmission to change the gear stages. The hydrostatic transmission and the downstream manual transmission are activated to change the gear stage of the downstream transmission. Whether the gear stage to be engaged through a gear stage change was successfully engaged is detected by a detection device, which is connected to an electronic control unit of the transmission arrangement. If the engagement of the gear stage to be engaged is not successful, the original gear stage is reengaged. After the engagement of the original gear stage, the downstream transmission is again activated such that the gear stage to be engaged is engaged.
摘要:
A synchronizer system and method allow synchronization of a plurality of rotating parts by determining a measured or calculated starting relative speed of the plurality of rotating parts, and based on the starting relative speed selecting a predetermined synchronizer force profile from among a plurality of candidate profiles for synchronizing the plurality of parts prior to engagement. The selected profile is retrieved and applied to a synchronizer between the plurality of parts to be engaged, and when the relative speed between the plurality of parts to be engaged becomes substantially zero, the plurality of parts can then be engaged to one another.
摘要:
A shift control system includes an engine speed detector, a multistage transmission, a gear position detector, a shifting operation detector, and an output controller. The engine speed detector is configured to detect an engine speed. The gear position detector is configured to detect a transmission gear. The shifting operation detector is configured to detect an operation of a shift operating element. The output controller is configured to restrict output of an engine in a case where an up-shifting operation is detected by the shifting operation detector. The output controller is configured to release output restriction of the engine before the gear position detector detects that switching to a next-stage transmission gear by the up-shifting operation of the shift operating element is completed.
摘要:
A gear change control device is provided in which a feedback control level for making an actual gear ratio between input rotational speed and output rotational speed of a transmission coincide with a target gear ratio is calculated. A control level calculation device calculates the feedback control level based on a deviation of acceleration of change in the actual gear ratio with respect to acceleration of change in the target gear ratio thereby making it possible to enhance the control responsiveness compared with a case in which the feedback control level is calculated based on the deviation of the actual gear ratio with respect to the target gear ratio, and also to detect the occurrence of a deviation of the actual value from the target value at early stage and carry out feedback, thus enabling gear change control to be carried out more linearly than in a conventional manner.