Throttle Control Device for Motorcycle Cylinder Air-Fuel Ratio Stability
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Solution Overview
Problem
Existing throttle control devices face challenges in maintaining stable air-fuel ratios across cylinders due to temperature differences and spatial constraints in motorcycles, leading to variations in air-intake inertia effects between inner and outer cylinders.
Innovation Solution
A throttle control device with separate motors for outer and inner throttle valves, utilizing a transmitting portion with synchronized throttle shafts and gears to ensure independent control of air-intake amounts, mitigating temperature differences and maintaining stable air-fuel ratios across cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor commonly operates all throttle valves including inner and outer cylinders, then device complexity is reduced, but air-fuel ratio control stability deteriorates due to temperature differences and spatial constraints
Solution Approach 1:
The throttle valve control system is segmented into two independent control groups: outer cylinder throttle valves controlled by a first motor and inner cylinder throttle valves controlled by a second motor. This segmentation allows independent control of air-intake amounts for inner and outer cylinders, compensating for temperature differences and spatial constraints that would otherwise cause air-fuel ratio variations.
2Length of moving object
If inner exhaust pipes are made shorter to fit within motorcycle space constraints, then spatial arrangement is optimized, but air-intake inertia effects vary between inner and outer cylinders
Solution Approach 1:
The control system applies local quality by providing differentiated control for inner and outer cylinder throttle valves. The second motor specifically controls inner cylinder throttle valves, allowing independent adjustment of air-intake amounts to compensate for the shorter exhaust pipe length and resulting different air-intake inertia effects compared to outer cylinders.
3Device complexity
If throttle valves are arranged with inner cylinders experiencing higher temperature, then compact spatial arrangement is achieved, but air-fuel ratio variation occurs due to temperature differences
Solution Approach 1:
The control system segments throttle valve control by spatial position, with the second motor dedicated to controlling inner cylinder throttle valves that experience higher temperatures. This enables independent air-intake amount control for inner cylinders, compensating for temperature-related variations in air density and fuel vaporization.
Data Source
AI summary
A throttle control device includes a throttle body having at least three air-intake passages aligned in line as being opened and closed respectively by a throttle valve, plural motors including a first motor which commonly operates the throttle valves placed at bilateral end sides among the throttle valves aligned in line and a second motor which operates a throttle valve placed at the inner side between the throttle valves at the bilateral end sides, and a transmitting portion which transmits operational force of the first motor to a first throttle shaft fixed to one throttle valve of the throttle valves at the bilateral end sides and to a second throttle shaft fixed to the other throttle valve thereof so as to rotate the first throttle shaft and the second throttle shaft in synchronization with each other.