Vehicle Travel Control Device Deceleration Threshold Logic
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Solution Overview
Problem
Existing vehicle travel control devices fail to adequately reflect a driver's intention in setting information for vehicle travel control when both vehicle speed and inter-vehicle distance are used as standards, as they do not allow for individual updates based on pedal operations and changing conditions.
Innovation Solution
A vehicle travel control device that updates inter-vehicle distance and vehicle speed settings individually based on pedal operations, considering changes in the host vehicle's and leading vehicle's conditions, allowing for selection of appropriate setting information to reflect the driver's intention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both vehicle speed setting and inter-vehicle distance setting are used as standards for vehicle travel control, then the control standards become more comprehensive, but the settings become complex and difficult to update individually based on pedal operations
Solution Approach 1:
The patent segments the update logic for vehicle speed setting and inter-vehicle distance setting by introducing a deceleration threshold judgment. When deceleration exceeds the threshold, only vehicle speed setting is updated; when it does not exceed, only inter-vehicle distance setting is updated. This segmentation resolves the contradiction by making each setting update independently controllable based on specific conditions.
Solution Approach 2:
The patent dynamically adjusts which setting is updated based on real-time deceleration conditions. The system transitions from a static approach where both settings would be updated uniformly to a dynamic approach where the update target changes according to the deceleration threshold, thereby simplifying the operation while maintaining comprehensive control.
2Ease of operation
If inter-vehicle distance setting is automatically set with the inter-vehicle distance at the end of accelerator operation, then the setting process is simplified, but the driver's intention through pedal operation is not sufficiently reflected
Solution Approach 1:
The patent introduces feedback mechanisms by monitoring deceleration values and using them to determine which setting should be updated. This feedback loop ensures that the system responds appropriately to driver inputs (pedal operations) and updates the correct setting parameter, thereby preserving the driver's intention while maintaining operational simplicity.
Solution Approach 2:
The patent changes the parameter used for setting update determination from a fixed rule (always update inter-vehicle distance) to a dynamic parameter (deceleration value). By comparing the deceleration threshold with actual deceleration, the system selectively updates either vehicle speed setting or inter-vehicle distance setting, thus capturing the driver's intention more accurately.
3Speed
If setting information is updated based on pedal operation without considering deceleration threshold, then the response is immediate, but the selection of setting to update becomes inaccurate
Solution Approach 1:
The patent performs preliminary judgment of the deceleration threshold before updating the setting information. This preliminary action ensures that the correct setting (vehicle speed or inter-vehicle distance) is selected for update based on the deceleration condition, thereby improving the accuracy of setting selection while maintaining timely response through efficient conditional logic.
Data Source
AI summary
The vehicle travel control device according to the invention is a vehicle travel control device that controls the travel of a host vehicle based on any of inter-vehicle distance setting and vehicle speed setting that are setting information set in advance, in which the inter-vehicle distance setting and the vehicle speed setting can be updated individually in accordance with the operation of an accelerator pedal or a brake pedal in the host vehicle, and setting information to be updated are selected based on the changes in the travelling conditions of the host vehicle or a leading vehicle.