Predictive Vehicle Shift Control Using Road Geometry Data
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Solution Overview
Problem
Existing vehicle shift control systems fail to accurately predict road conditions, leading to mismatch between the road's actual characteristics and the shift pattern, resulting in dissatisfaction for drivers due to suboptimal drivability and fuel efficiency.
Innovation Solution
A vehicle shift control apparatus that uses GPS sensors and navigation devices to calculate relative distances, altitudes, and rotation angles, determining the degree of curve and inclination of the road, allowing for predictive control of gear shifts through a shift controller that adjusts the transmission pattern based on these calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gear shifting is controlled based on fixed performance characteristics for the same vehicle model, then manufacturing and control simplicity is maintained, but driver satisfaction and drivability are reduced due to inability to adapt to individual driving tendencies
Solution Approach 1:
The system performs preliminary analysis of road information (curve degree, inclination, length) before the vehicle actually encounters the road section. This allows the controller to pre-determine the optimal shift pattern in advance, adapting to upcoming road conditions and driver tendencies before they manifest, thereby improving adaptability without requiring complex real-time adjustments
Solution Approach 2:
The system incorporates feedback mechanisms by analyzing actual driving behavior patterns and road condition responses to refine shift control strategies. The controller continuously monitors driving tendencies and adjusts shift patterns accordingly, creating a closed-loop system that adapts to individual driver preferences while maintaining manageable complexity through algorithmic processing
2Measurement precision
If road information prediction is performed using complex calculation methods, then prediction accuracy of road shape is improved, but calculation time and processing load increase
Solution Approach 1:
The system performs preliminary calculation of road parameters (curve degree, inclination, length) using navigation device data before the vehicle reaches the relevant road sections. By pre-processing and storing these road characteristics, the system avoids performing complex calculations in real-time during driving, thus achieving high prediction accuracy without excessive calculation time or processing load
Solution Approach 2:
The road is divided into multiple discrete sections with specific characteristics (curve sections, inclination sections, length segments). Each segment is analyzed independently with its own set of parameters, allowing the system to process road information in manageable units rather than attempting to analyze the entire road network simultaneously, reducing overall computational complexity while maintaining precision
3Productivity
If shift pattern changes are made frequently to adapt to varying road conditions, then drivability and fuel efficiency are improved, but gear shift iteration and system instability occur
Solution Approach 1:
The system determines the complete shift pattern in advance based on predicted road conditions for upcoming sections. By planning the entire shift sequence beforehand rather than making incremental adjustments, the system achieves optimal fuel efficiency through proactive gear selection while avoiding frequent, unstable shift changes that would compromise system stability
Solution Approach 2:
The shift control strategy is optimized locally for each specific road section (curve section, inclination section, straight section) with tailored shift patterns for each segment. This localized optimization ensures that gear changes are made only when and where necessary to match actual driving conditions, improving fuel efficiency without causing unnecessary shift iteration or instability in sections where no changes are needed
Data Source
AI summary
A shift control apparatus for a vehicle may include a GPS sensor detecting a vehicle location, a navigation device outputting short-distance road information and long-distance road information using the vehicle location, a vehicle controller restoring forward road information using the short-distance road information and the long-distance road information, and determining a degree of curve and an average degree of inclination of a road using the forward road information, and a vehicle shifting unit having a shift controller controlling a shift pattern of a transmission using the degree of curve and the average degree of inclination.