Engine Control Dispersion for Ring Gear Abrasion
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Solution Overview
Problem
Conventional engine control techniques lead to concentrated abrasion at the mesh portion of the ring gear and pinion, causing unsmooth engine starting due to the same stop position of the piston in the cylinder, resulting in incorrect mesh states and premature wear.
Innovation Solution
An engine control device with dispersion control means that adjusts the stop position of the ring gear to increase the dispersion of the mesh portion, preventing concentrated abrasion by altering the compression load and valve operations during engine stop and restart, ensuring correct engagement between the ring gear and pinion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stop position control is performed to control the piston stop position, then the piston can be positioned at a desired location, but the ring gear and pinion mesh at the same position causing concentrated abrasion
Solution Approach 1:
The invention introduces dynamic control of the compression load during engine stopping. By varying the compression load dynamically (through valve timing control), the system achieves both precise piston positioning and dispersion of the mesh portion, resolving the contradiction between positioning precision and mesh reliability
Solution Approach 2:
The invention changes the compression load parameter during engine stopping. By controlling the compression load to be within a specific range (different from normal operating conditions), the system achieves different piston stop positions that disperse the mesh portion, preventing concentrated abrasion while maintaining positioning control
2Device complexity
If no stop position control is performed, then the system is simpler, but the piston always stops at the same position causing concentrated abrasion at the mesh portion
Solution Approach 1:
The invention uses the engine's own compression load characteristics to achieve dispersion control. By utilizing the natural compression process and controlling valve timing, the system achieves piston position dispersion without requiring external complex control mechanisms, maintaining simplicity while improving reliability
Solution Approach 2:
The invention changes the compression load parameter during stopping to achieve desired dispersion. This parameter change approach allows the system to achieve reliable mesh dispersion without adding complex control hardware, maintaining system simplicity while resolving the abrasion issue
3Force
If compression load is increased during stopping, then the piston can be held at position, but the mesh portion becomes concentrated causing abrasion
Solution Approach 1:
The invention optimizes the compression load parameter to a specific range during engine stopping. By controlling the compression load to be within this optimized range, the system achieves both effective piston positioning and mesh portion dispersion, preventing the concentration that leads to abrasion
Solution Approach 2:
The invention dynamically adjusts the compression load during the stopping process. This dynamic control allows the system to achieve both force (position holding) and dispersion simultaneously, resolving the contradiction between maintaining compression load and preventing mesh concentration
Data Source
AI summary
A ring gear is connected to a crank shaft of an engine. A pinion is placed to face to the ring gear. When the engine is started, an ECU performs cranking of the engine under a state where the ring gear and the pinion are in mesh. The ECU releases the mesh state of the ring gear and the pinion after completion of the cranking of the engine. In particular, the ECU performs dispersion control to increase a degree of dispersion of a mesh portion of the ring gear which is meshed with the pinion when the rotation of the ring gear is stopped according to the engine stop. The dispersion control prevents the mesh portion of the ring gear and the mesh portion of the pinion from progressing abrasion and avoiding defect.