Abstract:
The invention relates to a software damper and to a method for configuring a software damper connected to a clutch control system for damping chatter vibrations of a clutch torque being transferred by means of an automated friction clutch positioned between a combustion engine and a transmission and controlled by the clutch control system, wherein a transmission input speed (r(g)) is captured at the output of the friction clutch by means of the software damper, and the target clutch torque (m(k)) encumbered by chatter vibrations is corrected by means of negative feedback. To design the software damper, a transfer behavior is ascertained over a control link of the clutch control system while the target clutch torque is excited in a frequency range which is relevant for chatter vibrations, under this transfer behavior an undamped first frequency response of the transmission input speed (r(g)) and a second frequency response at the output of the software damper are ascertained, and the negative feedback of the software damper is determined by comparing the two frequency responses.
Abstract:
The invention relates to a method for determining and/or controlling a position of an electric motor, in particular in a clutch actuation system of a motor vehicle, wherein the position of a rotor of the electric motor is picked up by a sensor system situated on a stator of the electric motor outside an axis of rotation of the electric motor, and the position signal picked up by the sensor system is analyzed by an analysis unit. In a method in which the rotor position is detected with a high level of certainty, the position signal is transmitted to the analysis unit depending on a transmission distance between the sensor system and the analysis unit by means of an SPI protocol signal for short transmission distances, and/or by means of a PWM signal for longer transmission distances.
Abstract:
Disclosed are dry clutch control method and apparatus for a vehicle. The method may include a reference speed generating step of generating a virtual target input shaft speed from a wheel speed, a vibration recognizing step of detecting a vibration component based on a difference between an actually measured input shaft speed and the virtual target input shaft speed, and a control input step of additionally applying an anti judder control input to a clutch control torque controlling a dry clutch connected to an input shaft. The anti judder control input may be applied to the vibration component recognized in the vibration recognizing step in a form of being continuously damped starting from an impulsive control input.
Abstract:
A microcomputer of a driving force distribution control device detects a maximum current value among values of an upper current acquired during a predetermined period, and determines that an overcurrent abnormality has occurred in the driving force distribution control device when the maximum current value is equal to or larger than an abnormal current threshold value and a time, for which the maximum current value is equal to or larger than the abnormal current threshold value, is equal to or larger than an abnormality detection time. Then, the microcomputer performs off control to turn off a relay, and notifies a driver of occurrence of the overcurrent abnormality using a notification unit.
Abstract:
A power transmission device for a vehicle equipped with a wet multiple disk clutch for disconnecting the power at the time of gearshift by using a clutch controller, wherein the amount of engagement where the clutch is half-engaged is learned maintaining precision. In the present invention, the clutch controller of the wet multiple disk clutch moves a clutch piston over the whole stroke thereof by using the working fluid for varying the amount of engagement at the start of learning the amount of engagement at a point where the clutch starts half-engaging and, immediately thereafter, the amount the clutch is half-engaged is detected. Upon moving the clutch piston, the working fluid present among the friction disks of the wet multiple disk clutch is drained and is replaced by the new working fluid avoiding detection error caused by the fluctuation in the temperature of the working fluid and eliminating unstable operation of the clutch piston caused by static friction of a large resistance. The amount of engagement at the point where the clutch starts half-engaging is determined by gradually increasing the amount of engagement after the clutch is disengaged and detecting a change in the rotational speed of the clutch input shaft.
Abstract:
An electromagnetic clutch provided with an armature in which two or more non-magnetic sections of differing radii are provided and which is installed on a rotary shaft, a rotor in which three or more non-magnetic section of differing radii that do not overlap with the non-magnetic sections are provided on a friction plate that faces the armature, and which rotates with respect to the rotation shaft by external force, a stator equipped with an electromagnetic coil for fixing the armature to the rotor by applying magnetic flux, which is generated by passage of an electric current, on the friction plate, and a control device for the electromagnetic coil. The control device is provided with a magnetomotive force change circuit for increasing, with a command to start power supply to the electromagnetic coil, the magnetomotive force of the electromagnetic coil above the magnetomotive force of the electromagnetic clutch during normal operation and for returning the magnetomotive force of the electromagnetic coil to the magnetomotive force of the electromagnetic clutch during normal operation when the armature is fixed to the rotor.
Abstract:
A system for controlling a transfer of torque from an engine to a manual transmission having a plurality of shiftable gears includes a selectively releasable and re-engageable clutch. The clutch is arranged inside the transmission and configured to transmit torque of the engine to the transmission when the clutch is in an engaged state. The system also includes a lever operatively connected to the transmission and movable to shift the gears. Additionally, the system includes an input device arranged on the lever and operable to selectively release and re-engage the clutch. A vehicle employing such a system is also provided.
Abstract:
A control system for a transmission includes an actuator module, a timer module, and a pulse module. The actuator module engages N hydraulic clutches and disengages M hydraulic clutches to operate the transmission in a gear ratio, wherein N and M are integers greater than zero. The timer module determines a first period starting when the transmission begins operating in the gear ratio. The pulse module selectively supplies a pressure pulse to P of the M hydraulic clutches based on the first period, wherein P is an integer greater than zero. A method for controlling a transmission is also provided.
Abstract:
An electromagnetic (EM) clutch assembly includes input and output discs, a plunger, a control solenoid, and a controller. The input disc is connected to a rotatable input member, and defines an input face having a mechanical feature. The output disc is connected to a rotatable output member, and includes a bore wall defining a bore. The plunger is positioned at least partially within the bore. The controller transmits a time-varying electrical control signal to the solenoid to thereby resonate the plunger toward the input disc, and transmits a steady-state electrical control signal to capture the plunger in an engaged position. Rotation of the discs is controlled until the plunger encounters the mechanical feature, thereby placing the assembly in an engaged state. A vehicle having a transmission and the EM clutch assembly is also disclosed, as is a method for controlling the clutch assembly via the electrical control signals.
Abstract:
A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, and a pump-motor operating at a range of pump-motor speeds for converting between hydraulic energy and mechanical energy. The pump-motor is disposed between the high pressure device and the low pressure device. In normal operation, the hydraulic drive system enters a motoring mode where hydraulic energy is released from the high pressure storage device and converted to mechanical energy using the pump-motor. It also enters a pumping mode where mechanical energy is converted into hydraulic energy. A neutral state exists where hydraulic energy is neither stored nor released from the high pressure storage device. An approach for compensating for temperature changes using varying pressure limits helps to maintain the hydraulic drive system in normal operation, thereby promoting efficiency within the hydraulic drive system.