Motorcycle Intake System Throttle Valve Malfunction Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motorcycle intake systems fail to adjust air intake appropriately when there is a malfunction in the valve device, leading to insufficient engine output and compromised traveling performance.
Innovation Solution
An intake system with a flow rate detector and throttle valve that adjusts air intake based on detected flow rates, combined with a continuously variable valve device and state detector, to ensure stable engine output and improved traveling performance, even in case of malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a valve device is used to control intake/exhaust, then fuel consumption is improved and power output is increased, but the system becomes unreliable when malfunctions occur
Solution Approach 1:
The patent introduces an intermediary throttle valve mechanism that can independently control air intake when the primary valve device malfunctions. This intermediary system ensures continuous reliable operation by taking over the air control function, preventing complete system failure while maintaining the high performance benefits of the variable valve mechanism.
Solution Approach 2:
The patent implements beforehand cushioning by providing a backup throttle valve system that is ready to activate immediately upon detecting a malfunction in the primary valve device. This pre-prepared redundancy ensures that performance degradation is minimized and system reliability is maintained even when the primary system fails.
2Measurement precision
If the flow rate detector is placed close to the engine, then detection precision is improved, but the detector is affected by blow-back from intake pulsation
Solution Approach 1:
The patent uses the air cleaner element as an intermediary barrier between the flow rate detector and the engine intake pulsation. This intermediary component filters the air flow and prevents blow-back from directly affecting the detector, allowing the detector to be positioned close to the engine for high precision measurement while eliminating the harmful blow-back effect.
3Volume of moving object
If the intake passage is made compact, then the motorcycle size is reduced, but space for protecting the flow rate detector from blow-back is limited
Solution Approach 1:
The patent merges the air cleaner element's protective function with the existing intake passage structure. By integrating the air cleaner into the compact intake system, the patent achieves both space efficiency and blow-back protection without requiring additional separate protection space, thus maintaining compact motorcycle design while safeguarding the flow rate detector.
4Productivity
If the throttle valve is added to adjust air intake, then the system becomes more complex, but the traveling performance is improved
Solution Approach 1:
The patent designs the throttle valve system to serve multiple functions: it acts as a backup control mechanism during malfunctions, provides fine-tuned air intake adjustment under normal operation, and works cooperatively with the air cleaner element for optimized performance. This multi-functionality justifies the added complexity by delivering enhanced traveling performance and reliability across various operating conditions.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motorcycle includes an air inlet pipe (26), an airflow box (27), an air cleaner box (8), and a throttle body as an air passage arranged to allow outside air to be taken into the engine (7). The air inlet pipe (26) is provided in a front portion of a main frame (1). The air inlet pipe (26) is provided with an airflow sensor (621) and a throttle valve (622). An air cleaner element (611) is provided between the airflow sensor (621) and the engine (7).