Motorcycle Traction Control Spin Detection
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Solution Overview
Problem
Conventional traction control systems for vehicles, particularly motorcycles, face challenges in quickly suppressing wheel spin, especially when the clutch is not connected, and struggle with varying engine speeds and low friction coefficients, leading to inadequate response characteristics and potential catalyst damage.
Innovation Solution
A traction control device that detects wheel spin using both vehicle speed from the driven wheel and engine speed, allowing for dynamic output reduction through ignition timing delay and intake control, with a sub-throttle valve to manage engine output, and switching between spin detection methods based on clutch connection state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spin detection is performed using vehicle speed difference between driving wheel and driven wheel, then the detection method is simple, but the response is delayed due to time lag in transmitting engine reaction to driving wheel
Solution Approach 1:
The system performs preliminary action by detecting spin based on engine speed and driven wheel speed before the spin fully manifests in the driving wheel. This allows the traction control to intervene earlier in the spin development process, improving response speed while maintaining detection simplicity through the use of readily available sensor data from the engine control unit.
2Speed
If engine speed is used for spin detection, then the response characteristic is improved, but the configuration cannot be applied when clutch is disconnected
Solution Approach 1:
The system dynamically adapts its spin detection method based on the clutch connection state. When the clutch is connected, it uses engine speed combined with driven wheel speed for detection. When the clutch is disconnected, it switches to using only driven wheel speed. This dynamic adaptation allows the system to maintain high response characteristics when applicable while ensuring versatility across all operating conditions.
3Object-affected harmful factors
If ignition timing of all cylinders is delayed to suppress engine output, then the spin suppression effect is achieved, but the recovery of grip is insufficient
Solution Approach 1:
Instead of uniformly delaying ignition timing across all cylinders, the system applies local quality by selectively delaying ignition timing in specific cylinders based on the detected spin condition and vehicle state. This localized approach allows for more nuanced engine output control that can suppress spin effectively while preserving enough power for grip recovery, improving overall traction control performance.
4Speed
If delay control is used to reduce engine output, then the response characteristic is good, but the range of output reduction is limited and catalyst damage may occur
Solution Approach 1:
The system uses partial action by combining delay control with intake control. Delay control provides rapid initial response to spin conditions, while intake control (through the sub-throttle valve) provides additional output reduction capability when needed. This combination allows the system to achieve sufficient output reduction for severe spin conditions without relying solely on excessive delay control that could damage the catalyst, thus balancing response characteristic with component protection.
Data Source
AI summary
A traction control device reducing an output of an engine unit for suppressing a spin of a driving wheel of a motorcycle, includes: a first spin detection unit detecting a spin of a rear wheel based on a vehicle speed calculated from a rotation of a front wheel being a driven wheel to which a driving force is not transmitted from the engine unit, and a vehicle speed calculated from a rotation of the rear wheel being the driving wheel to which the driving force is transmitted; and a second spin detection unit detecting the spin of the rear wheel based on a vehicle speed calculated from the rotation of the front wheel, and a vehicle speed calculated from a rotation of the engine unit.