Multi-Cylinder Throttle Valve Control for Intake Air Uniformity
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Solution Overview
Problem
In multi-cylinder engines, existing throttle control systems require complex and periodic manual adjustments to maintain optimal intake air amounts across cylinders, which is inefficient and prone to errors due to variations in cylinder dimensions and carbon fouling.
Innovation Solution
A throttle control system that uses an Electronic Control Unit (ECU) to independently control the opening degree of each throttle valve based on differences in intake air amounts among cylinders, automatically equalizing air flow without the need for a bypass passage or intake air adjustment valve, thereby maintaining optimal intake air without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If manual adjustment operations are performed to maintain optimal intake air amounts, then intake air uniformity among cylinders is improved, but operation complexity and time consumption increase
Solution Approach 1:
The throttle valve control system automatically adjusts intake air amounts for each cylinder based on sensor feedback, eliminating the need for manual adjustment operations. The system self-regulates by comparing actual intake air amounts with target values and autonomously controlling throttle valve opening degrees to maintain optimal uniformity among cylinders.
Solution Approach 2:
The system employs feedback control by detecting actual intake air amounts for each cylinder, comparing them with target values, and adjusting throttle valve opening degrees accordingly. This closed-loop control mechanism continuously monitors and corrects intake air uniformity without requiring manual intervention.
2Measurement precision
If throttle valves are controlled independently for each cylinder, then intake air amount precision is improved, but device complexity increases
Solution Approach 1:
The system divides the throttle control function into independent segments for each cylinder, with individual throttle valves and control logic for each cylinder. This segmentation enables precise independent control of intake air amounts for each cylinder, allowing the ECU to optimize air delivery to each cylinder separately based on its specific requirements.
Solution Approach 2:
The ECU performs multiple functions including detecting intake air amounts for each cylinder, calculating target values, controlling individual throttle valves, and managing fuel injection. This multi-functional approach consolidates control complexity into a single control unit that handles all throttle and fuel coordination tasks.
3Ease of operation
If bypass passages and intake air adjustment valves are installed, then manual adjustment capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The system replaces mechanical adjustment mechanisms (bypass passages and adjustment valves) with electronic control of throttle valves. The ECU electronically adjusts throttle valve opening degrees to achieve the same intake air adjustment function, eliminating the need for complex mechanical bypass systems and manual adjustment valves.
Solution Approach 2:
The invention extracts and removes the bypass passage and intake air adjustment valve components from the system. By eliminating these mechanical adjustment components, the system achieves intake air control solely through electronic throttle valve actuation, simplifying the overall system structure while maintaining adjustment capability.
Data Source
AI summary
A throttle control method of controlling an opening degree of a throttle valve in a multi-cylinder engine that includes throttle valves in intake passages provided for each cylinder. It is possible to independently control the opening degree for each of the throttle valves. The throttle control method includes controlling the opening degree of the throttle valve is based on differences among intake air amounts in the respective intake passages.