A method and device for operating a powertrain of a motor vehicle are provided, wherein the powertrain includes an internal combustion engine, a transmission and a friction clutch arranged there between in order to control a power flow between the internal combustion engine and the transmission. The method includes the steps of detecting clutch judder, analysing clutch judder, and determining a type of clutch judder. Based on determined type of clutch judder the method further includes selecting a udder countermeasure from a number of predetermined judder countermeasures and executing selected judder countermeasure. Detected clutch judder can be taken care of in an efficient way and future clutch judder may be prevented.

Embodiments of the present invention provide a control system (200) for an electric machine (120) of a vehicle, the control system comprising one or more controllers, the control system comprising input means (230) to receive a torque communication signal (255) indicative of torque communication through a belt (130) associated with the electric machine, processing means (210) arranged to determine a torque limit for the electric machine in dependence on the torque communication signal and a first torque threshold, and output means (240) arranged to output a torque limit signal (245) in dependence on the torque limit to control the torque communicated through the belt associated with the electric machine.

A vehicle includes a clutch that couples an engine to a transmission via a flywheel, a clutch actuator, and a controller configured to receive an obstructed launch command, elevate an engine operation, for a fixed period of time, beyond a typical launch operation upon receipt of the obstructed launch command, and engage the clutch against the flywheel for at least a portion of the fixed period of time.

A vehicle includes a clutch that couples an engine to a transmission via a flywheel, a clutch actuator, and a controller configured to receive an obstructed launch command, elevate an engine operation, for a fixed period of time, beyond a typical launch operation upon receipt of the obstructed launch command, and engage the clutch against the flywheel for at least a portion of the fixed period of time.

A method for mitigating powertrain abuse on a grade can include determining the grade a machine is on, the machine including an impeller clutch located between an engine and a powertrain so as to connect and disconnect engine power from the powertrain; and if the grade is over a threshold, a controller ignores any operator input to the impeller clutch such that machine speed retarding is utilized to keep the machine at a proper speed.

A control device for a vehicle drive device having a speed change mechanism that attains a predetermined shift speed by engaging multiple engagement elements. The control device predicts an amount of heat generation and determines whether any jumping shift from the current shift speed to the shift speed that is the multiple shift speeds higher or lower than the current shift speed can be permitted or not between the current shift speed and the target shift speed, and if the jumping shift can be permitted, the control unit performs the jumping shift and controls the speed change mechanism so as to shift the shift speed from the current shift speed to the target shift speed.

A control device for a vehicle drive device having a speed change mechanism that attains a predetermined shift speed by engaging multiple engagement elements. The control device predicts an amount of heat generation and determines whether any jumping shift from the current shift speed to the shift speed that is the multiple shift speeds higher or lower than the current shift speed can be permitted or not between the current shift speed and the target shift speed, and if the jumping shift can be permitted, the control unit performs the jumping shift and controls the speed change mechanism so as to shift the shift speed from the current shift speed to the target shift speed.

An overheat preventing method of a clutch for a vehicle may include a first comparing, by a controller, of comparing a temperature of a clutch with a first set temperature, as a result of performing the first comparing, when the temperature of the clutch is higher than the first set temperature, accelerator pedal map increasing, by the controller, of controlling a gain of an accelerator pedal map to be increased, after the accelerator pedal map increasing, a second comparing, by the controller, of comparing the temperature of the clutch with a second set temperature set to be lower than the first set temperature, and as a result of performing the second comparing, when the temperature of the clutch is lower than the second set temperature, an accelerator pedal map recovering, by the controller, of controlling the gain of the accelerator pedal map to be recovered to a reference value.

An overheat preventing method of a clutch for a vehicle may include a first comparing, by a controller, of comparing a temperature of a clutch with a first set temperature, as a result of performing the first comparing, when the temperature of the clutch is higher than the first set temperature, accelerator pedal map increasing, by the controller, of controlling a gain of an accelerator pedal map to be increased, after the accelerator pedal map increasing, a second comparing, by the controller, of comparing the temperature of the clutch with a second set temperature set to be lower than the first set temperature, and as a result of performing the second comparing, when the temperature of the clutch is lower than the second set temperature, an accelerator pedal map recovering, by the controller, of controlling the gain of the accelerator pedal map to be recovered to a reference value.

A vehicle drive system includes an internal combustion engine, a clutch, an engine rotation speed detector, an output shaft rotation speed detector, and a processor. The internal combustion engine includes cylinders and a crankshaft. The clutch is connected to the crankshaft via a torsion element and includes an output shaft. The engine rotation speed detector detects a crankshaft rotation speed. The output shaft rotation speed detector detects an output shaft rotation speed. The processor is configured to calculate a torque generated in each of the cylinders based on the crankshaft rotation speed. The processor is configured to decrease transmission torque of the clutch so that a difference between the crankshaft rotation speed and the output shaft rotation speed to be a target value when misfiring occurs. The processor is configured to identify a misfiring cylinder among the cylinders based on the torque calculated while the transmission torque is decreased.