DCT Shifting Control Using Compensation Torque
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Solution Overview
Problem
Vehicles with Double Clutch Transmission (DCT) lack the unique and sporty shifting response that drivers expect, as they shift similarly to automatic transmissions, failing to differentiate shifting between D range and Manual range effectively.
Innovation Solution
A shifting control method that applies additional compensation torque to the engagement-side clutch during manual range power-on up shifts, based on the driver's acceleration pedal input and engine vs. input shaft speed difference, to achieve shorter and lighter shifting times, distinct from automatic transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If DCT shifts like automatic transmissions with strict control features, then shifting smoothness is improved, but shifting response becomes slower and loses sporty characteristics
Solution Approach 1:
The patent applies dynamics by making the shifting control adaptive rather than fixed. The controller dynamically adjusts shifting parameters based on driving conditions, pedal position, and gear state. This allows the system to switch between smooth automatic-style shifting and rapid manual-style shifting, resolving the contradiction between stability and speed.
Solution Approach 2:
The patent changes key parameters including actual shifting time, torque application timing, and clutch control strategies based on operating conditions. By varying these parameters, the system achieves both smooth shifting when needed and rapid sporty response when the driver demands acceleration, eliminating the trade-off.
2Ease of operation
If DCT uses automatic shifting control like traditional automatic transmissions, then ease of operation is improved, but the unique sporty shifting response of manual transmission is lost
Solution Approach 1:
The patent makes the DCT shifting system universal by enabling it to perform both automatic shifting functions and manual sporty shifting functions. The controller automatically selects between different control strategies based on driving conditions, allowing the single system to deliver both ease of operation and sporty performance characteristics.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the clutch and torque converter in optimal states before shifting occurs. This preparation allows the system to execute shifts rapidly when needed while maintaining automatic operation simplicity, achieving both ease of use and sporty response.
3Reliability
If the actual shifting time is extended to ensure proper engagement, then reliability is improved, but the sporty and light shifting response is compromised
Solution Approach 1:
The patent uses feedback from sensors monitoring clutch position, torque converter state, and engine parameters to dynamically adjust shifting timing and duration. This real-time feedback ensures reliable engagement while minimizing shifting time, as the system can adapt to actual conditions rather than following fixed timing schedules.
Solution Approach 2:
The system performs preliminary preparation of the clutch and torque converter before the actual shifting event. By pre-positioning components and preparing torque transfer paths in advance, the system ensures reliable engagement occurs rapidly, reducing overall shifting duration while maintaining reliability.
Data Source
AI summary
A shifting control method for a vehicle with a Double Clutch Transmission (DCT), may include determining whether a manual range power-on up shift has been started, determining whether an actual shifting period has been started, when the manual range power-on up shift has been started, and applying additional predetermined compensation torque to basic torque applied to an engagement-side clutch, when the actual shifting period has been started.