A gear roll-testing method directed to the analysis and display of gear-set performance data, including motion transmission error, as acquired on gear-set rolling testers or gear-box test fixtures and includes the analysis and visualization of this data in the time-domain, frequency domain, and hybrids thereof. The invention further includes fundamental improvements in core signal processing, analytical and signal processing sequences that allow the data to be explored in more insightful ways, methods of visualizing and reporting the data and results, and a man-machine user-interface paradigm to provide these functions and features with greater flexibility and utility.

A gear roll-testing method directed to the analysis and display of gear-set performance data, including motion transmission error, as acquired on gear-set rolling testers or gear-box test fixtures and includes the analysis and visualization of this data in the time-domain, frequency domain, and hybrids thereof. The invention further includes fundamental improvements in core signal processing, analytical and signal processing sequences that allow the data to be explored in more insightful ways, methods of visualizing and reporting the data and results, and a man-machine user-interface paradigm to provide these functions and features with greater flexibility and utility.

Provided is a reusability determination method for a gear that makes it possible to determine reusability of a gear during or after use to increase the reuse ratio. The reusability determination method for a gear of the present invention includes a step of measuring a content of retained γ phases in the gear, a step of calculating a change rate of the content of the retained γ phases, a step of measuring residual stress applied to the gear, a residual stress ratio calculation step of calculating a residual stress ratio to residual stress in an initial state of the gear, and a reusability determination step of determining whether or not the gear is reusable on the basis of results of the calculation in the retained γ phase change rate calculation step and the residual stress ratio calculation step. In the reusability determination step, it is determined that the gear is reusable where the state of the gear corresponds to a first phase P.sub.1 or a second phase P.sub.2 from among the first phase P.sub.1, the second phase P.sub.2, and a third phase P.sub.3, and it is determined that the gear is not reusable where the state of the gear corresponds to the third phase P.sub.3.

Provided is a reusability determination method for a gear that makes it possible to determine reusability of a gear during or after use to increase the reuse ratio. The reusability determination method for a gear of the present invention includes a step of measuring a content of retained γ phases in the gear, a step of calculating a change rate of the content of the retained γ phases, a step of measuring residual stress applied to the gear, a residual stress ratio calculation step of calculating a residual stress ratio to residual stress in an initial state of the gear, and a reusability determination step of determining whether or not the gear is reusable on the basis of results of the calculation in the retained γ phase change rate calculation step and the residual stress ratio calculation step. In the reusability determination step, it is determined that the gear is reusable where the state of the gear corresponds to a first phase P.sub.1 or a second phase P.sub.2 from among the first phase P.sub.1, the second phase P.sub.2, and a third phase P.sub.3, and it is determined that the gear is not reusable where the state of the gear corresponds to the third phase P.sub.3.

A diagnosis apparatus includes: a sensor that detects diagnosis target information generated by a diagnosis target device; a threshold setting unit that sets a threshold for the diagnosis target information; and a diagnosis unit that diagnoses the diagnosis target device based on the diagnosis target information detected by the sensor and the threshold, in which the threshold setting unit sets the threshold based on the diagnosis target information in a predetermined period before a diagnosis time point, and the diagnosis unit performs diagnosis based on a current time point threshold set at the diagnosis time point and at least one past threshold set in the past.

A diagnosis apparatus includes: a sensor that detects diagnosis target information generated by a diagnosis target device; a threshold setting unit that sets a threshold for the diagnosis target information; and a diagnosis unit that diagnoses the diagnosis target device based on the diagnosis target information detected by the sensor and the threshold, in which the threshold setting unit sets the threshold based on the diagnosis target information in a predetermined period before a diagnosis time point, and the diagnosis unit performs diagnosis based on a current time point threshold set at the diagnosis time point and at least one past threshold set in the past.

The invention relates to a method for controlling, more particularly in a closed-loop manner, a test bench for a powertrain with a real transmission, the method including calculating a desired value of a control parameter, more particularly a desired rotational speed, at the transmission output of the real transmission by means of a model that represents the transmission and at least one further component, more particularly a shaft, of the output side of the powertrain as virtual components, on the basis of at least one measurement parameter, more particularly a rotational speed and/or a torque, measured on the powertrain; and controlling the test bench, more particularly a load machine, on the basis of the desired value.

A apparatus is provided for carrying out an optical test method for a gearwheel. The testing apparatus includes a first camera for capturing image data of a first type of tooth flanks of the gearwheel to be tested, a position sensor for determining a rotational position of the gearwheel to be tested, a control device for evaluating the rotational position determined by this position sensor and for controlling the camera on the basis of this turning position, and a first illuminating device designed for illuminating an area of the gearwheel to be tested, which area is provided for capturing the image data.

A method for plausibilizing a sensor signal of a single-track vehicle. The method includes: estimating gear ratios between a wheel speed of a wheel and a pedaling frequency of a pedal of a pedal unit and/or a drive speed of a drive of the single-track vehicle at multiple points in time; ascertaining a value of a reliability indicator based on the estimated gear ratios, the value of the reliability indicator being ascertained with the aid of a statistical parameter, in particular a variance, of the estimated gear ratios and/or a histogram of the estimated gear ratios; and plausibilizing the sensor signal based on a comparison of the value of the reliability indicator with a threshold value, the threshold value corresponding to a maximally permissible value of the reliability indicator.

A method for plausibilizing a sensor signal of a single-track vehicle. The method includes: estimating gear ratios between a wheel speed of a wheel and a pedaling frequency of a pedal of a pedal unit and/or a drive speed of a drive of the single-track vehicle at multiple points in time; ascertaining a value of a reliability indicator based on the estimated gear ratios, the value of the reliability indicator being ascertained with the aid of a statistical parameter, in particular a variance, of the estimated gear ratios and/or a histogram of the estimated gear ratios; and plausibilizing the sensor signal based on a comparison of the value of the reliability indicator with a threshold value, the threshold value corresponding to a maximally permissible value of the reliability indicator.