Motorcycle Throttle Control Preventing Engine Reverse Rotation
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Solution Overview
Problem
Engines in motorcycles can experience reverse rotation when engine speed decreases below idle speed due to increased gas pressure in the combustion chamber, leading to potential misfires and unnecessary fuel consumption.
Innovation Solution
A throttle opening control system that includes an accelerator opening acquisition module, engine rotation speed acquisition module, and a throttle opening control module, which limits the throttle valve opening when the engine speed is lower than a predetermined idle speed to prevent reverse rotation by maintaining a controlled throttle opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the throttle valve opening is increased to supply sufficient fuel for engine operation, then the fuel supply is improved, but the gas pressure in the combustion chamber increases causing reverse rotation of the engine
Solution Approach 1:
The throttle valve opening is dynamically adjusted based on real-time engine rotation speed feedback. When the engine rotation speed falls below the idle rotation speed, the control unit automatically limits the throttle valve opening to prevent reverse rotation, while still maintaining sufficient fuel supply for engine operation.
Solution Approach 2:
The system uses engine rotation speed sensors to provide continuous feedback to the control unit. This feedback mechanism allows the control unit to monitor engine status and automatically adjust the throttle valve opening to prevent reverse rotation when the engine speed drops below the idle threshold, while ensuring adequate fuel supply is maintained.
2Ease of operation
If the engine rotation speed is allowed to decrease naturally, then the engine responds to rider input, but the gas pressure increases causing harmful reverse rotation
Solution Approach 1:
The control system takes preliminary action by monitoring engine rotation speed and preemptively limiting the throttle valve opening when the speed approaches the idle threshold. This prevents the gas pressure increase that would lead to reverse rotation, while still allowing the engine to respond naturally to rider input through normal operation.
3Reliability
If misfire is forced to prevent reverse rotation, then reverse rotation is prevented, but fuel consumption increases unnecessarily
Solution Approach 1:
Instead of forcing misfire, the system dynamically adjusts the throttle valve opening based on engine rotation speed. This maintains reliable prevention of reverse rotation by limiting throttle opening when speed is below idle, while avoiding unnecessary fuel consumption that would result from forced misfire.
Data Source
AI summary
A throttle opening control device for a vehicle having an engine with an electronically controlled throttle valve and an accelerator operated by a rider is provided. The throttle opening control device includes an accelerator opening acquisition module for acquiring an opening of the accelerator, an engine rotation speed acquisition module for acquiring a rotation speed of the engine, and a throttle opening control module for controlling an opening of the throttle valve based on the opening of the accelerator and the rotation speed of the engine. The throttle opening control module is configured to limit the opening of the throttle valve when the rotation speed of the engine is lower than a pre-determined idle rotation speed to prevent reverse rotation of the engine.