Exhaust Valve Actuation Mechanism for Engine
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Solution Overview
Problem
Existing exhaust control devices for motorcycles complicate the configuration and management of exhaust valves with multiple components and increased weight, making precise control of actuating regions difficult and affecting productivity.
Innovation Solution
A simplified exhaust control device configuration using a single actuator to drive two exhaust valves, where the second exhaust valve lever synchronously actuates the first exhaust valve lever, reducing the number of components and weight, and allowing efficient control of exhaust valves based on engine rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a single actuator is used to drive multiple exhaust valves, then the number of components and weight are reduced, but the configuration complexity and difficulty of precise control increase
Solution Approach 1:
The patent divides the exhaust valve control into separate functional units: a first actuator for low-speed region valves and a second actuator for high-speed region valves. Each actuator independently controls its designated valves, avoiding the complexity of a single actuator trying to manage multiple valves across different speed regions.
Solution Approach 2:
The patent implements a universal exhaust control strategy where the control system can adaptively select which actuators to activate based on engine rotation speed. The same control architecture serves multiple functions by dynamically configuring actuator operation modes, eliminating the need for separate dedicated actuators for each valve type.
2Quantity of substance
If a single actuator drives exhaust valves in different rotation speed regions, then component count is reduced, but precise management of actuating regions becomes difficult
Solution Approach 1:
The patent employs dynamic control strategies where the ECU dynamically adjusts actuator operation based on real-time engine rotation speed detection. The control system transitions between different actuator activation states (first actuator only, second actuator only, both actuators) depending on the detected rotation speed, enabling precise region management through dynamic response.
Solution Approach 2:
The patent implements feedback control by continuously monitoring engine rotation speed and using this information to determine which actuators should be active. The control system compares the detected rotation speed against predetermined thresholds and adjusts actuator operation accordingly, ensuring precise control of exhaust valve timing across different speed regions.
Data Source
AI summary
An exhaust control device for engine configures an exhaust system by joining exhaust pipes at a collecting pipe. The exhaust pipes are coupled to a plurality of respective cylinders. At least two types of exhaust valves are configured to perform an exhaust control at different parts in the exhaust system. The exhaust control device for engine includes first exhaust valves, a second exhaust valve, and an actuator. The first exhaust valves are mounted to a plurality of communicating pipes and communicating the predetermined exhaust pipes. The second exhaust valve is mounted to the collecting pipe. The actuator is configured to drive to open and close the second exhaust valve. The first exhaust valves are configured to be driven to open and close corresponding to an actuating region of the second exhaust valve.