Transmission Hydraulic Parameter Estimation for Sensor Fault Verification
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Solution Overview
Problem
In vehicle automatic transmissions, sensor failures or malfunctions in the hydraulic clutch system lead to inaccurate monitoring and potential unnecessary vehicle stalling, despite the hydraulic unit potentially functioning properly, reducing vehicle availability.
Innovation Solution
A method and device that estimate hydraulic fluid parameters using additional parameters, such as electric solenoid valve current, hydraulic pump speed, and temperature, allowing for verification of sensor measurements and providing a redundant signal to enable continued operation and safe driving to a service station for repairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor measurement is used to monitor hydraulic unit operation, then monitoring accuracy is improved, but system reliability deteriorates when sensor fails or malfunctions
Solution Approach 1:
The patent creates a virtual copy of the hydraulic parameter measurement through estimation algorithms. Instead of relying solely on the physical sensor, the system generates an estimated hydraulic parameter value through computational models that replicate the expected sensor output, providing a redundant measurement channel that maintains system reliability when the physical sensor fails
Solution Approach 2:
The patent introduces an intermediary estimation system between the physical sensor and the control decision-making process. This intermediary layer processes multiple input parameters through algorithms to generate estimated hydraulic parameters, acting as a mediator that can verify sensor readings or provide alternative values when the sensor malfunctions, thereby maintaining system reliability
2Object-affected harmful factors
If vehicle is stalled as precautionary measure when sensor fails, then safety is improved, but vehicle availability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the estimated hydraulic parameters are continuously compared with sensor measurements to validate sensor operation. When discrepancies indicate sensor failure, the system switches to using estimated values for control decisions, allowing the vehicle to continue operating safely without unnecessary stalling, thus maintaining productivity while managing safety risks
Solution Approach 2:
The patent prepares compensatory measures in advance by developing estimation algorithms that can immediately take over when sensor failure occurs. This prior cushioning approach ensures that safety-critical functions have backup capabilities ready, allowing the vehicle to maintain operation rather than requiring immediate stalling when sensor failure is detected
Data Source
AI summary
Method for determining a hydraulic fluid parameter of a hydraulic clutch for a transmission of a vehicle, comprising receiving from a sensor a measurement of the hydraulic fluid parameter; receiving a further parameter different from the hydraulic fluid parameter; estimating the hydraulic fluid parameter based on at least the obtained further parameter; and comparing the received sensed hydraulic fluid parameter with the estimated hydraulic fluid parameter.