DCT Control Method for Noise Reduction in P Range
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Solution Overview
Problem
Dual Clutch Transmission (DCT) vehicles experience noise and reduced merchantability due to gear coupling and decoupling operations when ignition is switched on and off, particularly in the P range, causing discomfort to passengers.
Innovation Solution
A DCT control method that verifies the shift lever position during ignition-off and holds the odd and even stages in a first stage and R stage respectively when in the P range, minimizing gear coupling and decoupling operations, and couples the stages only after engine cranking in other ranges to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gear coupling and decoupling operations are performed when ignition is switched on and off in the P range, then the vehicle can be driven immediately without additional shifting operations, but noise is generated causing merchantability to deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-coupling the odd stage to the first stage and the even stage to the R stage before ignition-off. When ignition is switched off in the P range, these stages remain in their coupled states rather than being canceled to neutral. This preliminary preparation eliminates the need for gear coupling operations when ignition is switched on, thereby preventing noise generation while maintaining immediate vehicle readiness.
2Device complexity
If the odd stage and even stage are canceled to neutral when ignition is switched off, then the gear coupling state is simplified, but noise is generated when gear coupling occurs during ignition-on switching
Solution Approach 1:
The patent applies preliminary action by pre-coupling the odd stage to the first stage and the even stage to the R stage before ignition-off. When ignition is switched off in the P range, these stages remain in their coupled states rather than being canceled to neutral. This preliminary preparation eliminates the need for gear coupling operations when ignition is switched on, thereby preventing noise generation while maintaining immediate vehicle readiness.
3Productivity
If gear coupling operations are performed in all shift ranges when ignition is switched on, then the vehicle can be driven immediately, but noise becomes remarkable reducing merchantability
Solution Approach 1:
The patent applies local quality by implementing different gear coupling strategies for different shift ranges. Specifically, in the P range, the odd stage is pre-coupled to the first stage and the even stage is pre-coupled to the R stage before ignition-off, eliminating noise-generating coupling operations. In other shift ranges (R, N, D), the traditional neutral cancellation method is used, and gear coupling is performed after engine cranking when noise is masked by engine sounds. This localized differentiation resolves the contradiction between vehicle readiness and noise reduction.
Data Source
AI summary
The noise caused by the coupling and decoupling of the gear generated when ignition on and off of a dual-clutch mounted vehicle in the P range are switched to each other, and the merchantability of the vehicle can be increased by improving the noise performance of the vehicle by preventing the noise generated by the coupling of the gear as possible from being remarkable in other shift ranges.