Transmission Ratio Control With Abnormality Detection Feedback
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Solution Overview
Problem
Existing transmission ratio controllers for vehicles do not effectively detect abnormalities in the transmission ratio achieved by the transmission mechanism, which can occur due to electronic signal errors or mechanical faults, leading to potential performance issues.
Innovation Solution
A transmission ratio controller with circuitry that includes a calculator to determine the request transmission ratio based on engine state, an instructor to send control signals to the actuation mechanism, and an abnormality determiner to compare the request, instruction, and actual transmission ratios, determining if the difference exceeds a predetermined value to identify abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission ratio control is implemented based on engine state parameters, then transmission performance is improved, but abnormality detection capability deteriorates
Solution Approach 1:
The patent implements feedback by comparing the actual transmission ratio (calculated from input/output shaft rotation speeds) with the target transmission ratio (determined from engine state). This closed-loop feedback mechanism enables automatic abnormality detection when deviations exceed a threshold, resolving the contradiction by adding detection capability without compromising transmission control performance.
Solution Approach 2:
The patent performs preliminary calculation of both target and actual transmission ratios before comparison. By pre-calculating expected transmission ratio based on engine state and pre-measuring actual transmission ratio from shaft speeds, the system prepares all necessary data for abnormality detection in advance, enabling reliable detection while maintaining optimal transmission performance.
2Manufacturing precision
If transmission ratio is determined based on engine state parameters, then transmission control accuracy is improved, but detection of transmission ratio deviation from actual mechanism deteriorates
Solution Approach 1:
The patent introduces an intermediary calculation method that derives actual transmission ratio from measurable physical quantities (input shaft rotation speed and output shaft rotation speed). This intermediary approach provides an independent measurement path that is not dependent on the target transmission ratio calculation, enabling accurate detection of deviations between controlled and actual transmission ratios.
3Device complexity
If no abnormality detection mechanism is implemented, then device complexity is reduced, but reliability of transmission mechanism deteriorates
Solution Approach 1:
The patent implements self-service by enabling the transmission control system to automatically monitor and detect its own abnormalities. The control unit uses existing sensors and calculations to perform self-diagnosis, eliminating the need for separate complex detection hardware while maintaining high reliability through automatic abnormality identification when transmission ratio deviations exceed thresholds.
Data Source
AI summary
A transmission ratio controller includes circuitry. The circuitry includes a transmission ratio calculator configured to calculate a request transmission ratio to a transmission mechanism, a transmission ratio instructor configured to output a control signal based on the request transmission ratio, and an abnormality determiner configured to determine whether a transmission ratio of the transmission mechanism is abnormal. At least two of the request transmission ratio, an instruction transmission ratio corresponding to the control signal, or an actual transmission ratio achieved by the transmission mechanism are transmission ratios subject to comparison. The abnormality determiner is configured to determine that when a difference obtained by comparing the transmission ratios subject to comparison is greater than or equal to a predetermined specified value, the transmission ratio of the transmission mechanism is abnormal.