A clutch for a motor vehicle with a wear compensation mechanism which includes a sensor element for detecting wear, wherein the sensor element is formed of a plurality of parts, and at least two sensor component parts are rotatably connected to one another.

A method for determining an undesired condition in an electrical drive system including an electrical machine and an electrical drive, wherein the method includes a) obtaining a measured signal of an electrical or mechanical parameter, b) obtaining a frequency spectrum of the measured signal, that contains a measured frequency component, c) determining whether the measured frequency component is within a predetermined distance from a trend line, which trend line is associated with only one specific frequency component of the electrical or mechanical parameter present during a specific undesired condition, d) on the condition that the measured frequency component is within the predetermined distance from the trend line increasing a counter associated with the trend line, e) repeating steps a) to d), wherein in case the counter reaches a predetermined number determining that the electrical drive system is subjected to the undesired condition associated with the trend line.

A bench test calibration method for generating wet clutch torque transfer functions includes obtaining in-vehicle clutch torques at a set of shift conditions; performing a series of bench tests at various clutch pack clearances and lubrication oil flow rates at the set of shift conditions; adjusting clutch pack clearances and lubrication oil flow rates during the series of bench tests in response to a difference between a bench test measured clutch torques and the corresponding in-vehicle clutch torques exceeding a threshold; and recording relationships between first bench test measured torques and force profiles of a clutch actuator relative to the adjusted clutch pack clearances and lubrication oil flow rates for each of the set of shift conditions as a first transfer function.

In order to be able to test an assembly of components of a vehicle on a test stand with improved dynamics, it is provided to calculate, in a simulation unit (20) using a simulation model (21) for the at least one component of the assembly, the instantaneous drive train rotary speed (n.sub.P) of this component from a drive train torque (T.sub.P) acting in the drive train (2) and the braking effect (B) of the braking system (11), and the calculated instantaneous drive train rotary speed (n.sub.P) is used by the vehicle control device (14) for calculating the at least one component, and the calculated drive train rotary speed (n.sub.P) is used by a drive controller (23) for controlling the load machine (8).

A brake test stand includes at least one driving motor that is coupled, via at least one torque transmitting device to a load generator and at least one brake to be tested, wherein the driving motor provides the energy to be converted by the brake to be tested and the load generator accepts the energy provided by the driving motor at least prior to the brake test.

A system for early detection of onset of oscillatory instabilities in practical devices is described. The system consists of a measuring device, an instability detection unit and a control unit. The measuring device is configured to generate signals corresponding to the dynamics happening inside the practical device. The instability detection unit is configured to diagnose the stability of the practical device from the signals that are generated by the measuring device. Further, the control unit is configured to control various operating parameters in the practical device based on the information obtained from the instability detection unit.

An inductive gear sensing system suitable for sensing gear (gear tooth) movement, such as some combination of speed, direction and position, based on differential sensor response waveforms. Example embodiments of inductive gear sensing with differential sensor response for different gear configurations include generating differential pulsed/phased sensor response signals from dual differential sensors based on axial (proximity-type) sensing for offset differential sensors (FIG. 1B, 102, 102; FIG. 2B, 201, 202), and generating asymmetrical response signals from a single sensor based on lateral and axial sensing with either asymmetrical gear teeth (FIG. 3A, 30A; FIG. 3B, 30B) or an asymmetrical sensor (FIG. 4B, 401) or a combination of both.

A method and system for diagnosing gear condition by comparing data collected from each member of a set of coupled gears, including mating gears. Data containing vibrations or other signals from the set of coupled gears are collected. Condition indicators are calculated from the vibration data. The values of these condition indicators are compared for each pair of coupled gears. A divergence of the condition indicators as indicated by the comparison may indicate the presence of a faulted or otherwise anomalous condition. Such indication may be provided to a user. In one variation, the vibration data are used to calculate a synchronous average for each gear and the condition indicators are based on the synchronous average.

A transmission range selection sensor includes a housing defining a bore extending along a central axis. A piston is slideably disposed within the bore. A magnet carrier is attached to and moveable with the piston. A magnet is supported by and moveable with the magnet carrier. A first magnetic sensor and a second magnetic sensor are supported by the housing and are spaced from each other along the central axis. A position of the magnet carrier along the central axis is determinable from a sensed magnetic flux from the first and second magnetic sensors. The sensor includes at least one magnetic flux concentrator attached to one of the magnet carrier or the housing. The flux concentrator is operable to concentrate the magnetic flux toward at least one of the first magnetic sensor or the second magnetic sensor depending upon a position of the magnet along the central axis.

An abnormality determining device includes: a current value detecting unit configured to detect a current value which is a value of a drive current of a motor; a variance ratio calculating unit configured to group time-series current values detected in time series by the current value detecting unit at a predetermined time interval, to calculate a variance value of the current values of each group, and to calculate a variance ratio of each group by dividing the variance value of the current values of the corresponding group by a variance value of a reference current value of the motor when a reduction gear is normal; and a determination unit configured to determine that the reduction gear is abnormal when the variance ratios calculated by the variance ratio calculating unit for all the groups are equal to or greater than a threshold value.