Vehicle Transmission Control Uphill Determination Stabilization
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Solution Overview
Problem
Existing vehicle transmission control systems face challenges in preventing shift-busy states when a vehicle climbs an uphill while towing a heavy load, as the uphill determination value decreases when the accelerator pedal is released, leading to inappropriate shift map selection and uncomfortable driving experiences.
Innovation Solution
A vehicle transmission control apparatus that calculates a corrected uphill determination value using a moderating coefficient to stabilize the shift map selection, preventing premature shifts by smoothing the reduction in uphill determination value when the load exceeds the standard carrying capacity, thus avoiding shift-busy states without requiring inclination or weight sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the uphill determination value is calculated based on the difference between expected acceleration and actual acceleration, then the shift map selection can be improved for uphill climbing, but the determination value suddenly decreases when the accelerator pedal is released causing incorrect shift map selection
Solution Approach 1:
The system performs preliminary action by calculating and storing the uphill determination value before the accelerator release occurs. When accelerator release is detected, the system uses this pre-calculated value rather than allowing it to suddenly decrease, thereby preventing incorrect shift map selection while maintaining accurate uphill determination.
Solution Approach 2:
The invention applies beforehand cushioning by detecting accelerator release in advance and preventing the sudden decrease of the uphill determination value. This cushioning effect ensures that the shift map selection remains reliable even when the accelerator pedal is released during uphill climbing with heavy loads.
2Productivity
If a shift map for steep uphill is selected, then the vehicle can climb uphill effectively, but releasing the accelerator causes the uphill determination value to decrease leading to selection of a gentler uphill shift map instead
Solution Approach 1:
The system uses feedback by continuously monitoring accelerator pedal position and detecting release events. When release is detected during uphill climbing, the feedback mechanism prevents the uphill determination value from decreasing, thereby maintaining the correct shift map selection and preventing shift-busy states that would cause driver discomfort.
Solution Approach 2:
The system performs preliminary action by detecting accelerator release before it causes the uphill determination value to decrease. This allows the control unit to maintain the appropriate shift map selection in advance, preventing both performance degradation and driver discomfort.
3Adaptability or versatility
If the uphill determination value decreases when the accelerator is released, then the system responds to driver input, but this causes shift-busy states and driver discomfort
Solution Approach 1:
The system applies dynamics by making the uphill determination value adaptive to driver input while maintaining stability. The value dynamically responds to accelerator operations under normal conditions but becomes stable and resistant to change when accelerator release is detected during uphill climbing, thus preventing shift-busy states while maintaining adaptability.
Solution Approach 2:
The feedback mechanism monitors accelerator pedal position and provides different responses based on the operating condition. During uphill climbing with heavy loads, the feedback prevents the determination value from decreasing upon accelerator release, thereby maintaining transmission control stability while still adapting to normal driver inputs.
Data Source
AI summary
A vehicle transmission control apparatus includes an expected-acceleration calculator configured to calculate an expected acceleration of a vehicle based on at least an engine load and a vehicle speed. An actual-acceleration calculator is configured to calculate an actual acceleration of the vehicle. An uphill determination device is configured to calculate an uphill determination value based on a difference between the expected acceleration and the actual acceleration and configured to calculate a corrected uphill determination value by subjecting the uphill determination value to moderating calculation using a moderating coefficient and to update the corrected uphill determination value in accordance with the moderating coefficient. A transmission-characteristic selecting device is configured to select one of transmission characteristics based on the corrected uphill determination value. A transmission controller is configured to perform transmission control based on the transmission characteristic selected by the transmission-characteristic selecting device.