Transmission Control Device for Shift Timing Discrepancies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transmission control devices with multiple shift stages often result in shift change timing discrepancies, leading to driver discomfort due to gear ratio setting values, which can cause shifts to occur at different timings than intended by the driver.
Innovation Solution
A control device for transmissions with multiple shift stages that includes a setting unit to choose between a normal and a sport mode, where the sport mode excludes certain shift stages to maintain engine speed higher, allowing for improved acceleration performance and minimizing shift change timing discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gear ratio setting values are used for shift change control, then the transmission can execute shift changes according to predetermined ratios, but the shift change timing may differ from the driver's intended timing causing discomfort
Solution Approach 1:
The patent applies dynamics by making the shift change control adaptable and flexible rather than fixed. The control device dynamically adjusts shift timing based on multiple parameters including accelerator opening degree, vehicle speed, and engine load. This allows the system to respond to driver intentions in real-time, resolving the contradiction between predetermined gear ratios and driver-specific timing needs.
Solution Approach 2:
The patent changes multiple parameters simultaneously to achieve smooth shift transitions aligned with driver intent. It adjusts engine speed targets, torque management levels, and shift timing based on accelerator opening degree and vehicle state. This multi-parameter adjustment allows the system to maintain both the structural integrity of gear ratio progression and the flexibility needed for driver comfort.
2Speed
If the engine speed is maintained in a high state, then the acceleration performance is improved, but the fuel consumption increases
Solution Approach 1:
The system dynamically adjusts engine speed targets based on driving conditions and accelerator opening degree. During acceleration requests, the engine speed is maintained higher to improve responsiveness and performance. During steady-state or low-demand conditions, the engine speed is reduced to lower fuel consumption. This dynamic adaptation resolves the contradiction between acceleration performance and fuel efficiency.
Solution Approach 2:
The patent employs parameter changes by adjusting engine speed targets, torque management levels, and shift timing based on accelerator opening degree and vehicle state. During acceleration, parameters are set to maintain higher engine speeds for improved responsiveness. During cruising or low-demand states, parameters are adjusted to reduce engine speed and fuel consumption, thereby resolving the contradiction between acceleration performance and fuel efficiency.
3Adaptability or versatility
If multiple shift stages are used, then the transmission can provide more gear ratios for better performance, but the shift change timing may become inconsistent with driver expectations
Solution Approach 1:
The patent makes the shift change control dynamic and adaptive to driver behavior. It monitors accelerator opening degree, vehicle speed, and engine load to predict driver intentions. This dynamic control allows the system to use multiple shift stages effectively while adjusting shift timing to match driver expectations, resolving the contradiction between gear ratio versatility and shift timing consistency.
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring driving conditions, accelerator input, and vehicle state to adjust shift timing. This feedback loop allows the transmission control to learn and adapt to driver preferences, ensuring that shift changes occur at timing consistent with driver expectations while still utilizing multiple shift stages for performance optimization.
Data Source
AI summary
A control device for a transmission that has multiple shift stages and is configured to change an amount of power output from an engine of a vehicle for output includes a setting unit and a control unit. The setting unit is capable of setting, as a shift change mode, either one of a first shift change mode and a second shift change mode in which a speed of the engine is maintained in a higher state than that in the first shift change mode. The control unit is configured to execute shift change control on a basis of the set shift change mode. The control unit is configured to exclude one or more shift stages of the multiple shift stages and execute the shift change control when the second shift change mode is set.