Vehicle Travel Control for Predictive Cornering Resistance Compensation
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Solution Overview
Problem
Existing vehicle control systems experience delays in response to control outputs, leading to deviations in cornering resistance timing and vehicle response, causing occupant discomfort during travel.
Innovation Solution
A travel control device and method that utilizes a vehicle control ECU connected to sensors and a map database to estimate cornering resistance and adjust the correction control amount based on friction coefficient, swerve risk, and continuous curved travel conditions, applying a suppression rate to the correction control amount to reduce discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a correction amount corresponding to estimated cornering resistance is applied to the control amount, then the cornering resistance compensation is improved, but the timing deviation between cornering resistance occurrence and vehicle response causes occupant discomfort
Solution Approach 1:
The system estimates cornering resistance in advance based on map information about upcoming curved sections and applies the correction amount before the vehicle actually encounters the cornering resistance. This preliminary action allows the vehicle to respond in advance to the upcoming resistance, eliminating timing deviation and occupant discomfort while maintaining accurate compensation.
2Reliability
If the correction control amount is increased to improve cornering resistance compensation, then the resistance compensation effectiveness is improved, but the vehicle response delay causes timing deviation and increased occupant discomfort
Solution Approach 1:
By using map information to predict upcoming curved sections and estimating cornering resistance in advance, the system applies correction amounts before the vehicle reaches the curved section. This eliminates the need to wait for the vehicle to actually experience the resistance, effectively removing the response time delay while maintaining or enhancing compensation effectiveness.
3Reliability
If the correction control amount is applied without suppression, then the cornering resistance compensation is maximized, but occupant discomfort increases due to timing deviation between resistance occurrence and vehicle response
Solution Approach 1:
The system determines whether to apply suppression based on timing comparison: if the estimated cornering resistance occurrence time is later than the current time plus predicted response time, suppression is applied to reduce discomfort. This allows full correction amounts to be applied when timing alignment is good, while suppressing corrections when timing deviation would cause discomfort.
Data Source
AI summary
A travel control device is provided as a vehicle control ECU for controlling a travel of a vehicle. The vehicle control ECU includes: a resistance estimator estimating a cornering resistance, which is a travel resistance acting on the vehicle in a curved travel section where a curved travel of the vehicle is scheduled; a correction determiner determining whether the cornering resistance is out of an allowable resistance range; and a correction setter setting a correction amount when it is determined that the cornering resistance is out of the allowable resistance range.