Vehicle Shift Control via Fuel Cut Region Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle shift control systems fail to optimize driving performance according to individual driver tendencies, leading to suboptimal fuel efficiency in eco mode due to inadequate engine braking and downshift strategies.
Innovation Solution
A system and method that detect data for shift control, including accelerator pedal position, vehicle speed, and acceleration, to determine a fuel cut shift condition, allowing for early upshift during acceleration and downshift during deceleration by estimating the engine's fuel cut region, thereby changing the driving mode from eco to normal when conditions are met to enhance fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the downshift line is declined when the upshift line is declined in eco mode, then the shift pattern can generate upshift in low rotation speed region, but the shifting point before stopping becomes low vehicle speed which decreases engine braking effectiveness
Solution Approach 1:
The controller performs preliminary determination of the fuel cut shift condition before executing the shift. By checking whether the predicted rotation speed of the target shift stage is less than the fuel cut engine speed in advance, the system prepares for optimal fuel cut timing, ensuring both early upshift capability and effective engine braking through proper downshift line management.
2Productivity
If the shift pattern is optimized for early upshift in eco mode, then fuel efficiency can be improved, but the downshift line becomes too low which reduces engine braking and fuel cut function effectiveness
Solution Approach 1:
The system dynamically changes the downshift line parameter based on the fuel cut shift condition. When the condition is satisfied (accelerator pedal position below threshold, lift-foot-up condition met, and predicted rotation speed below fuel cut engine speed), the controller adjusts the downshift line to a higher vehicle speed, thereby maintaining engine braking effectiveness while preserving fuel efficiency benefits.
3Device complexity
If a fixed shift pattern is used for all driving conditions, then the control system is simple, but it cannot adapt to different driver tendencies and conditions leading to suboptimal performance
Solution Approach 1:
The shift pattern transitions from a fixed static configuration to a dynamic adaptive system. The controller continuously monitors driving conditions (accelerator pedal position, vehicle speed, current shift stage) and dynamically adjusts the shift pattern by determining the fuel cut shift condition and selecting appropriate upshift and downshift lines, enabling adaptation to different driving scenarios while maintaining reasonable system complexity.
Data Source
AI summary
The present disclosure relates to a system and a method of controlling a shift for a vehicle that generates an upshift in an early stage under an acceleration condition and delays a downshift under a deceleration condition by estimating a fuel cut region of an engine during eco mode driving. The system for controlling a shift of a vehicle that may including: a data detector configured to detect data for shift control; and a controller configured to determine a driving mode of the vehicle by determining a fuel cut shift condition when a current driving mode of the vehicle is an eco mode based on the data, wherein the controller outputs a shift stage according to the determined driving mode.