CACC Transmission Shift Map Control for Fewer Unnecessary Gear Shifts
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Solution Overview
Problem
Cooperative adaptive cruise control (CACC) systems increase the number of unnecessary gear shifting events, leading to reduced fuel economy and increased wear and tear on the transmission.
Innovation Solution
Implement a gear shifting management system that updates transmission maps to adjust shift thresholds, analyzes CACC vehicle states, and utilizes predictive gear shifting to minimize unnecessary gear shifts by maintaining current gear settings or anticipating future shifts based on look-ahead information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CACC mode is enabled with standard transmission shift map, then vehicle cooperative control is improved, but gear shifting frequency increases leading to reduced fuel economy
Solution Approach 1:
The system performs preliminary actions by updating the transmission shift map before CACC operations begin, and by using look-ahead information to predict upcoming gear shift events. This allows the transmission control to proactively adjust shift thresholds and bypass unnecessary shifts before they occur, reducing gear shifting frequency while maintaining cooperative control performance
Solution Approach 2:
The system dynamically adjusts transmission shift thresholds based on CACC operational mode and vehicle state. The transmission shift map is updated to increase thresholds at higher gears during CACC operation, and the controller dynamically bypasses gear shifts when torque demands indicate unnecessary shifts based on predictive analytics, creating an adaptive transmission control system
2Adaptability or versatility
If CACC mode is enabled with standard transmission shift map, then vehicle cooperative control is improved, but transmission wear and tear increases
Solution Approach 1:
The system updates the transmission shift map in advance to account for CACC operational characteristics, establishing higher shift thresholds before unnecessary gear changes occur. This preliminary configuration prevents excessive transmission component engagement and disengagement cycles that lead to wear
Solution Approach 2:
The system continuously monitors torque demands and vehicle state during CACC operation, using this feedback to determine whether to bypass upcoming gear shifts. This closed-loop control prevents unnecessary transmission shifts that would increase wear, while maintaining appropriate shifts when actually needed for vehicle performance
3Use of energy by moving object
If transmission shift map is updated to reduce gear shift sensitivity, then fuel economy is improved, but gear shifting responsiveness may be reduced
Solution Approach 1:
The system dynamically adjusts transmission shift thresholds based on operating conditions. During CACC operation at higher gears, thresholds are increased to reduce unnecessary shifts and improve fuel economy. However, the system maintains the ability to respond quickly to genuine torque demands that indicate actual shifting needs, preserving responsiveness when required
Solution Approach 2:
The transmission shift map parameters are changed based on CACC mode and vehicle state. Shift thresholds are increased at higher gears during cooperative cruise control operation to reduce gear shifting frequency and improve fuel economy, while maintaining appropriate sensitivity for necessary shifts
Data Source
AI summary
Systems and methods for transmission gear shift management of a vehicle having cooperative adaptive cruise control (CACC) are provided. A method includes: enabling a cooperative adaptive cruise control (CACC) mode of a vehicle; updating a transmission shift map to adjust at least one threshold associated with a transmission shift event in response to enabling the CACC mode of the vehicle; receiving a torque demand from the vehicle in response to enabling the CACC mode of the vehicle; determining a transmission shift event based on the received torque demand and the updated transmission shift map; and implementing the determined transmission shift event.