Transmission Pressure Correlation Control Under Sensor Abnormalities
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Solution Overview
Problem
Existing transmission systems in vehicles face challenges in maintaining safe and convenient shifting operations when errors occur in pressure sensors, leading to potential safety hazards and reduced user convenience.
Innovation Solution
A control apparatus and method that utilize a hydraulic pressure unit with a hydraulic pressure circuit including line and control pressure sensors and valves, allowing the controller to perform adaptive control operations by correlating line and control pressures to ensure smooth shifting even when sensor abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors are used to monitor hydraulic pressure in the transmission system, then shifting control precision is improved, but system reliability deteriorates when sensor abnormalities occur
Solution Approach 1:
The patent introduces a pressure correlation relationship as an intermediary mechanism between the line pressure sensor and control pressure sensor. When one sensor detects abnormality, the system uses the correlation relationship (control pressure = line pressure × control pressure ratio) to calculate the abnormal sensor's value based on the other sensor's reading, thereby maintaining system reliability while preserving measurement precision capabilities
Solution Approach 2:
The system dynamically changes the parameter used for pressure monitoring based on sensor status. Normally, both line pressure and control pressure are monitored independently. When abnormality occurs, the system switches to using the correlated parameter (calculating one pressure from the other via the established ratio), thus adapting the measurement approach to maintain reliability
2Reliability
If sensor abnormality detection is implemented, then system safety is improved, but shifting operation convenience deteriorates due to potential unintended shifts
Solution Approach 1:
The system implements continuous feedback through the abnormality detection unit that monitors sensor status in real-time. When abnormality is detected, the feedback mechanism triggers a switch to alternative control mode using pressure correlation, allowing the system to maintain safe operation while preserving shifting convenience through adaptive response rather than rigid safety protocols
Solution Approach 2:
The control system dynamically adapts its operation mode based on sensor health status. Rather than a static safety protocol that would restrict operation, the system transitions between normal dual-sensor mode and alternative control mode using pressure correlation, maintaining both safety and operational convenience through dynamic adjustment
3Reliability
If dual pressure sensors and abnormality detection are added, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functionality of dual pressure sensors by establishing a correlation relationship between line pressure and control pressure. This allows the system to treat the two sensors as interconnected components rather than independent elements, reducing the effective complexity while maintaining the reliability benefits of dual sensing through the combined pressure correlation approach
Data Source
AI summary
A control apparatus of a transmission includes a hydraulic pressure circuit, an abnormality detector, and a controller. The transmission performs shifting operation of the transmission. The controller controls the shifting operation by controlling, as a first control operation, a control pressure adjusting value to allow a line pressure and a control pressure to have a correlation with each other and by using, as a value of the line pressure, a value calculated on a basis of a detected value of the control pressure. The controller controls the shifting operation by controlling, as a second control operation, the control pressure adjusting valve to allow the line pressure and the control pressure to have a correlation with each other and by using, as a value of the control pressure, a value calculated on a basis of a detected value of the line pressure.