Generator Voltage Control via Engine Rotation Inverse for Acceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional motorcycle systems require an additional sensor to detect throttle movement for reducing engine load during acceleration, increasing manufacturing costs.
Innovation Solution
A power generation controlling method that adjusts the target voltage of a generator connected to a four-stroke engine based on the inverse of the engine's rotation number, eliminating the need for throttle operation information by detecting changes in the rotation number to determine acceleration states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional sensor is added to detect throttle movement for reducing engine load during acceleration, then the acceleration performance can be maintained, but the manufacturing cost increases
Solution Approach 1:
The system uses the existing rotation number sensor to detect acceleration states by monitoring changes in rotation number over time. The control unit calculates the rate of change of rotation number and uses this information to automatically adjust generator output, eliminating the need for additional throttle position sensors while maintaining proper acceleration performance.
Solution Approach 2:
The rotation number sensor serves multiple functions: it not only monitors engine speed for basic control but also detects acceleration states by calculating the rate of change of rotation number. This multi-functional use of the existing sensor eliminates the need for dedicated throttle position sensors, reducing manufacturing costs while maintaining system reliability.
2Power
If the target voltage is reduced based on throttle operation information, then the engine load is reduced during acceleration, but an additional sensor is required
Solution Approach 1:
The system replaces the mechanical/throttle-based detection method with an electronic calculation approach. Instead of using a throttle position sensor to detect acceleration, the control unit calculates the rate of change of rotation number from existing sensor data, substituting a simpler electronic calculation for a more complex mechanical sensing system.
Solution Approach 2:
The system changes the parameter used for acceleration detection from throttle position to rotation number rate of change. By monitoring how quickly the rotation number changes rather than where the throttle is positioned, the system achieves the same control objective with existing sensors, reducing device complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In the power generation controlling method, it is judged whether or not each of the peaks of the inverses of the rotation numbers measured in a plurality of successive cycles of the four-stroke engine is equal to or lower than a first threshold and equal to or higher than a second threshold. If a first peak of the inverse of the rotation number measured in a first cycle following the plurality of successive cycles described above is not equal to or lower than the second threshold, it is judged whether or not the first peak is equal to or higher than a third threshold, which is higher than the first threshold. Furthermore, if a second peak of the inverse of the rotation number measured in a second cycle following the first cycle is equal to or lower than a fourth threshold, a target voltage of power generation by a generator a rotating shaft of which is connected to a crank shaft of the four-stroke engine is changed from a normal state voltage to an in-acceleration voltage, which is lower than the normal state voltage.