Engine Stop Control via Wheel Speed Sensors for Motorcycle Overturning
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Solution Overview
Problem
Existing engine control methods for straddle-type vehicles, such as motorcycles, rely on expensive acceleration sensors to detect vehicle inclination for engine stop control, and there is a need for a cost-effective alternative to ensure engine stop control during vehicle overturning, especially when the primary sensor fails.
Innovation Solution
Implementing a method that uses vehicle speed sensors to determine the state of non-driving and driving wheels, where the engine stop control is initiated when the non-driving wheel is substantially stopped and the driving wheel is rotating, allowing for engine stop control without the need for expensive acceleration sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acceleration sensors are used to detect vehicle inclination for engine stop control, then the reliability of engine stop control during overturning is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces expensive acceleration sensors with inexpensive wheel speed sensors that are already present in the vehicle. The wheel speed sensors provide a cost-effective alternative for detecting overturning conditions by monitoring wheel rotation states, thereby reducing manufacturing cost while maintaining engine stop control functionality
Solution Approach 2:
The patent substitutes the mechanical/inertial measurement approach (acceleration sensors) with a rotational motion detection approach (wheel speed sensors). By detecting the rotational state of wheels rather than measuring vehicle inclination directly, the system achieves overturning detection using a different physical principle that leverages existing vehicle components
2Ease of manufacture
If wheel speed sensors are used instead of acceleration sensors, then the manufacturing cost is reduced, but the measurement precision for detecting vehicle inclination may be worsened
Solution Approach 1:
The patent divides the overturning detection task into analyzing the rotational states of individual wheels separately. By monitoring the front and rear wheels independently and comparing their rotation states, the system can infer vehicle orientation and overturning conditions without directly measuring inclination, thereby achieving detection functionality with less precise sensors
Solution Approach 2:
The patent uses wheel rotation state as an intermediary indicator to infer vehicle overturning conditions. Instead of directly measuring vehicle inclination with high-precision sensors, the system detects changes in wheel rotation patterns that occur during overturning, using the wheel rotation as a proxy measurement that is sufficient for the intended application
Data Source
AI summary
An engine control method for the straddle-type vehicle including a non-driving wheel state determination step of determining whether a front wheel of the straddle-type vehicle is in a substantially stopped state, a driving wheel state determination step of determining whether a rear wheel of the straddle-type vehicle is in a substantially rotating state, and an engine stop control step of performing an engine stop control of the straddle-type vehicle. In the engine stop control step, the engine stop control of the straddle-type vehicle is performed when it is determined that the front wheel is in the substantially stopped state in the non-driving wheel state determination step, and the rear wheel is in the substantially rotating state in the driving wheel state determination step.