CVT Shift Speed Control During Power Recovery in Straddled Vehicles
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Solution Overview
Problem
Existing technologies fail to manage the power supply interruptions in straddled vehicles, which can lead to unstable vehicle performance and inefficient power systems, which can cause rapid changes in behavior and the straddled vehicles, which can lead to unstable vehicle performance and unsafe driving conditions.
Innovation Solution
A straddled vehicle with a continuously variable transmission (CVT) and an electric motor controlled by a controller that adjusts the shift speed to a first speed equal to or less than a preset value when power is restored, reducing the change in behavior by controlling the shift speed to a maximum value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the controller immediately increases the shift speed to maximum value when power is restored, then the response time of the transmission is improved, but the vehicle behavior becomes unstable and ride comfort deteriorates
Solution Approach 1:
The controller detects power supply restoration in advance and immediately executes a power restoration process that limits the shift speed to a predetermined value rather than allowing immediate maximum speed. This preliminary action prevents the sudden change in vehicle behavior that would occur with immediate maximum shift speed, while still enabling the transmission to gradually return to normal operation.
2Stability of the object's composition
If the controller limits the shift speed to a predetermined value when power is restored, then the vehicle behavior stability is improved, but the response time of the transmission is reduced
Solution Approach 1:
The controller executes a power restoration process immediately upon detecting power supply restoration, proactively managing the shift speed transition. This preliminary action establishes a controlled ramp-up of shift speed from the predetermined value to maximum value, preventing the need for later corrective actions and minimizing overall response time while maintaining stability.
Solution Approach 2:
The controller dynamically adjusts the shift speed based on the power restoration state. During the power restoration process, the shift speed is limited to a predetermined value, but once this process is complete, the shift speed can increase to maximum value. This dynamic adjustment optimizes both stability during transition and response time after restoration.
3Device complexity
If the controller does not manage power supply interruptions, then the system complexity is reduced, but the vehicle performance becomes unstable and safety is compromised
Solution Approach 1:
The controller monitors the power supply state and detects when power is restored. Based on this feedback, the controller automatically executes the power restoration process that limits shift speed to a predetermined value. This feedback mechanism ensures reliable vehicle performance during power interruptions without requiring complex manual intervention or additional hardware systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes the change in vehicle behavior by controlling the shift speed to a first speed less than the maximum value, enhancing ride comfort and stability when power is restored.
Implementation Method 1
a power source that is an electric motor 31 and changes a shift position of the continuously variable transmission 21
Implementation Method 2
the controller 40 controls the electric motor 31 to make a shift speed of the shift position equal to or less than a first speed
Data Source
Figure 1
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AI summary
There is discloseda straddled vehicle (1) including an engine (11), a continuously variable transmission (21), an electric motor (31), and a controller (40). The engine (11) generates power; the continuously variable transmission (21) transmitting power of the engine (11) to a rear wheel (5); the electric motor (31) changing a shift position of the continuously variable transmission (21); the controller (40) controlling the electric motor (31); when the controller (40) changes from a non-power-supply state to a power-supply state, the controller (40) controls the electric motor (31) to make a shift speed of the shift position equal to or less than a first speed (V1); the first speed (V1) being smaller than a maximum value (M) of the shift speed.