Partial Cylinder Engine Start for Smooth Gear Engagement
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Solution Overview
Problem
Conventional engine-equipped vehicles experience gear noise and gear wear due to sudden engine rotation speed increases when starting, which can exceed the clutch engagement rotation speed of the centrifugal clutch, leading to rough gear engagement.
Innovation Solution
Implementing a partial cylinder operation start controlled by an electronic control device, where only some cylinders are operated initially, making it difficult for the engine rotation speed to exceed the clutch engagement rotation speed, ensuring smooth gear engagement and preventing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is started with all cylinders operating, then the engine can start reliably with sufficient torque, but the engine rotation speed suddenly rises and may exceed the clutch engagement rotation speed, causing gear noise and gear wear
Solution Approach 1:
The invention divides the engine's cylinder operation into segments: during engine start, only a first cylinder is operated while a second cylinder is stopped. This segmentation allows the engine to start with reduced torque output, preventing sudden rotation speed increases that would exceed clutch engagement speed, thereby avoiding gear noise and wear while maintaining reliable starting capability
Solution Approach 2:
The invention applies partial action by operating only one cylinder during engine start instead of all cylinders. This partial operation provides sufficient torque for reliable engine starting while limiting the maximum rotation speed increase, preventing the engine speed from exceeding the clutch engagement rotation speed and thus eliminating gear noise and wear during the starting phase
Data Source
AI summary
An engine-equipped vehicle capable of preventing gear noise and gear wear when the engine is started is provided. A multicylinder engine, a gear transmission that shifts power from the multicylinder engine by a shift operation, a centrifugal clutch arranged in a power transmission path from the multicylinder engine to the gear transmission, and an electronic control device that controls an operation of the multicylinder engine are included and the engine is configured to be started with a partial cylinder operation start where under control of the electronic control device, only some cylinders are operated and an operation of other cylinders is stopped.