A diagnostic system of a vehicle for diagnosing a drive belt of a continuously variable transmission. A diagnostic circuit detects or predicts a fault of the drive belt based on an operating parameter received from a sensor associated with the vehicle during a predetermined diagnostic period.

A diagnostic system of a vehicle for diagnosing a drive belt of a continuously variable transmission. A diagnostic circuit detects or predicts a fault of the drive belt based on an operating parameter received from a sensor associated with the vehicle during a predetermined diagnostic period.

The invention relates to a method for ascertaining the backlash (40) of a gear (24) which is coupled to an electric machine (12) of a vehicle which has at least one electric machine (12). According to the method, at least the following steps are carried out: a) detecting the rotational speed of the at least one electric machine (12) during a driving intervention (80) and detecting rotational speed fluctuations produced therefrom, b) evaluating a high-frequency vibration (60) which is generated as a result of the gear (24) reaching a lower stop (54) in delay phases (56) and reaching an upper stop (50) when reversing the rotational direction in acceleration phases (58), c) filtering out high-frequency components from the high-frequency vibration (60) according to step b), wherein position information (42), relating to a corresponding rotational angle, from the rotational speed signal is saved in the event said components occur, and d) evaluating the distance between the upper stop (52) and the lower stop (54) and ascertaining the backlash (40) from the difference of the position information (42) between the upper stop (52) and the lower stop (54).

The invention relates to a method for ascertaining the backlash (40) of a gear (24) which is coupled to an electric machine (12) of a vehicle which has at least one electric machine (12). According to the method, at least the following steps are carried out: a) detecting the rotational speed of the at least one electric machine (12) during a driving intervention (80) and detecting rotational speed fluctuations produced therefrom, b) evaluating a high-frequency vibration (60) which is generated as a result of the gear (24) reaching a lower stop (54) in delay phases (56) and reaching an upper stop (50) when reversing the rotational direction in acceleration phases (58), c) filtering out high-frequency components from the high-frequency vibration (60) according to step b), wherein position information (42), relating to a corresponding rotational angle, from the rotational speed signal is saved in the event said components occur, and d) evaluating the distance between the upper stop (52) and the lower stop (54) and ascertaining the backlash (40) from the difference of the position information (42) between the upper stop (52) and the lower stop (54).

A system for determining at least one mechanical property of a mechanical power transmitter may use thermal sensor data. The system may include the mechanical power transmitter; at least one thermal sensor disposed on or in the mechanical power transmitter; and a controller configured to receive data from the at least one thermal sensor and to process the data using a model based on machine learning to determine the at least one mechanical property of the mechanical power transmitter.

Methods and systems for operating a transmission that includes one or more dog clutches are described. In one example, a torque capacity of a gear is estimated from an engagement depth of the dog clutch, and the gear may be held or shifted according to the torque capacity of the gear and a commanded torque.

Methods and systems for operating a transmission that includes one or more dog clutches are described. In one example, a torque capacity of a gear is estimated from an engagement depth of the dog clutch, and the gear may be held or shifted according to the torque capacity of the gear and a commanded torque.

A vehicle includes an engine, a continuously variable transmission including an endless belt to output a power from the engine, and a transmission to which the power from the continuously variable transmission is transmitted. If the vehicle travel speed is not smaller than a first threshold value and an accelerator opening degree is not smaller than a second threshold value, a controller determines that the continuously variable transmission is being used in a belt high-load situation. If a travel distance in the belt high-load situation is not smaller than a third threshold value, the controller determines that the endless belt is deteriorated or deterioration thereof is in an advanced stage, and a deterioration message about the endless belt is displayed on a display based on an instruction from the controller. A situation in which a speed changing ratio of the continuously variable transmission is not greater than a fourth threshold value may be determined as the belt high-load situation.

A vehicle includes an engine, a continuously variable transmission including an endless belt to output a power from the engine, and a transmission to which the power from the continuously variable transmission is transmitted. If the vehicle travel speed is not smaller than a first threshold value and an accelerator opening degree is not smaller than a second threshold value, a controller determines that the continuously variable transmission is being used in a belt high-load situation. If a travel distance in the belt high-load situation is not smaller than a third threshold value, the controller determines that the endless belt is deteriorated or deterioration thereof is in an advanced stage, and a deterioration message about the endless belt is displayed on a display based on an instruction from the controller. A situation in which a speed changing ratio of the continuously variable transmission is not greater than a fourth threshold value may be determined as the belt high-load situation.

A work vehicle locking differential energy management system includes axle speed sensors for monitoring the rotational speeds of axle half-shafts. The axle half-shafts are coupled through a locking differential, which contains a differential clutch mechanism. A processing subsystem is configured to: (i) when the locking differential is placed in a locked state, calculate a differential lock force applied to the clutch mechanism, and calculate a differential slip speed from a disparity in the rotational speeds of the axle half-shafts; (ii) estimate an internal temperature of the clutch mechanism based, at least in part, on the differential lock force and the differential slip speed; (iii) detect differential overtemperature events during which the internal temperature of the clutch mechanism exceeds a first critical temperature threshold; and (iv) perform at least one differential overtemperature action in response to detection of a differential overtemperature event.