Adaptive Driveforce Control for Consistent Vehicle Speed Limits
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Solution Overview
Problem
Current vehicle systems lack the ability to dynamically adjust drive force and pedal mapping in response to varying road and mass conditions, leading to inconsistent acceleration and deceleration experiences for the driver.
Innovation Solution
A driveforce speed control system that utilizes sensors to detect speed limits and road conditions, and an electronic control unit (ECU) to calculate road load and mass conditions, thereby dynamically adjusting the drive force and pedal mapping to maintain consistent speed and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant or fixed base drive force is used, then system simplicity is maintained, but speed control consistency across varying driving conditions deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from fixed base drive force to dynamic drive force that adapts in real-time to varying driving conditions. The ECU continuously adjusts drive force based on detected road grade, mass conditions, and speed limit data, enabling the system to maintain reliable speed control across different terrains and loads without requiring complex manual intervention.
Solution Approach 2:
The patent implements feedback through sensor systems that detect road grade, vehicle speed, and mass conditions, with the ECU processing this information to automatically adjust drive force. This closed-loop feedback mechanism ensures consistent speed control by continuously monitoring actual performance and making real-time corrections based on detected conditions.
2Device complexity
If fixed pedal mapping is used, then system simplicity is maintained, but acceleration consistency across different road grades deteriorates
Solution Approach 1:
The patent applies dynamics to pedal mapping by making it adaptive rather than fixed. The system dynamically adjusts pedal mapping based on detected road grade and mass conditions, so that the same pedal position produces appropriate acceleration regardless of whether the vehicle is climbing a grade, descending, or on level ground. This maintains ease of operation while achieving consistent acceleration behavior.
Solution Approach 2:
The patent changes the parameter of pedal mapping from a fixed relationship to a variable one that adjusts based on driving conditions. By modifying the mapping parameters in response to detected road grade and mass conditions, the system ensures that pedal feel and acceleration response remain consistent across different operating environments without requiring complex driver adaptation.
3Ease of operation
If manual motor control is required for varying road grades, then driver control precision is maintained, but driver workload and control difficulty increase
Solution Approach 1:
The patent applies self-service by enabling the control system to automatically compensate for varying road grades and mass conditions without requiring active driver intervention. The ECU monitors detected conditions and autonomously adjusts drive force and pedal mapping to maintain consistent speed control, effectively making the system self-regulating and reducing driver workload while maintaining ease of operation.
Solution Approach 2:
The patent uses feedback mechanisms where sensors detect road grade, vehicle speed, and mass conditions, and the ECU processes this information to automatically adjust control parameters. This feedback loop eliminates the need for drivers to manually compensate for changing conditions, reducing control difficulty while maintaining precise speed control through automated adjustments.
Data Source
AI summary
Methods, systems, devices and apparatuses for a driveforce speed control system for a vehicle. The driveforce speed control system includes a sensor configured to detect a speed limit, and an electronic control unit (ECU) coupled to the sensor. The ECU is configured to calculate a road load and a mass condition, determine a speed limit based on the sensor, and activate a speed control based on the road load, the mass condition, and the speed limit.