Throttle Valve Opening Speed Control for Engine Cylinder Output
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Solution Overview
Problem
In engines with separated exhaust ports, such as V-type or horizontally opposed engines, output deviation among cylinders can lead to throttle shock due to uneven combustion states and exhaust pipe lengths, resulting in unnatural acceleration and operability issues.
Innovation Solution
The engine employs a controller to adjust the opening speed of throttle valves, where the throttle valve upstream of the cylinder with higher output is opened at a lower speed than others, reducing output deviation and preventing throttle shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the throttle valve is prevented from opening suddenly to avoid throttle shock, then the acceleration feeling becomes unnatural
Solution Approach 1:
The patent applies local quality by differentiating the opening speed control among throttle valves based on their respective cylinder output characteristics. Specifically, throttle valves upstream of cylinders with larger output are opened at lower speeds, while those upstream of cylinders with smaller output are opened at higher speeds. This localized differentiation resolves the contradiction by preventing throttle shock in high-output cylinders while maintaining natural acceleration response in low-output cylinders.
2Stability of the object's composition
If throttle valves are opened at different speeds to balance cylinder output, then output deviation among cylinders is reduced, but control complexity increases
Solution Approach 1:
The patent employs parameter changes by adjusting the opening speed parameter of throttle valves based on cylinder output characteristics. The controller modifies the opening speed parameter differently for throttle valves upstream of cylinders with larger output versus those upstream of cylinders with smaller output. This parameter differentiation achieves output uniformity among cylinders while keeping the control system relatively simple by only adjusting the opening speed parameter.
Data Source
AI summary
An engine includes: an engine main body including a plurality of cylinders; a plurality of throttle valves positioned on intake sides of the plurality of cylinders; and a controller configured to control opening and closing operation of the plurality of throttle valves. Output of a part of the plurality of cylinders is larger than output of rest of the plurality of cylinders. And the controller opens a part of the throttle valves upstream of the part of the plurality of cylinders at a lower speed than rest of the throttle valves upstream of the rest of the plurality of cylinders.