Driving Assistance Device Deceleration Pattern Segmentation
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Solution Overview
Problem
Existing driving assistance devices cause driver discomfort due to varying deceleration patterns based on distance to the target stop position, leading to inconsistent deceleration experiences.
Innovation Solution
A driving assistance device that generates a target deceleration pattern with distinct first and second deceleration patterns, where deceleration in the first pattern is greater than in the second, and determines a constant deceleration start point based on the target pattern, regardless of distance, to stabilize deceleration assistance and reduce fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the deceleration pattern is adjusted based on the distance from the present point to the target stop position, then the deceleration control can be optimized for different distances, but the deceleration pattern becomes greatly changed causing driver discomfort
Solution Approach 1:
The deceleration pattern is segmented into two distinct phases: a first deceleration pattern applied from a predetermined position to the target stop position, and a second deceleration pattern applied before the predetermined position. This segmentation allows each phase to have optimized deceleration characteristics while maintaining overall consistency, preventing driver discomfort caused by excessive variations in the deceleration pattern.
2Adaptability or versatility
If the deceleration start point is determined dynamically based on distance, then the control can be adapted to different scenarios, but the deceleration pattern becomes inconsistent leading to driver discomfort
Solution Approach 1:
A predetermined position is established in advance relative to the target stop position. The deceleration control system uses this predetermined position as a reference point to switch between deceleration patterns, ensuring that the transition occurs at a consistent location regardless of the total distance to the stop position. This preliminary establishment of a reference point maintains pattern consistency while allowing adaptability to different distances.
3Loss of energy
If the deceleration section is extended to reduce fuel consumption, then more energy-efficient deceleration is achieved, but the deceleration period increases causing driver discomfort
Solution Approach 1:
The deceleration control system dynamically adjusts the deceleration pattern based on the vehicle's current position relative to the predetermined position and target stop position. By applying the first deceleration pattern (with higher deceleration) only in the final section and the second pattern (with lower deceleration) in the earlier section, the system optimizes the balance between deceleration distance and time, reducing fuel consumption while maintaining an acceptable deceleration period that does not cause driver discomfort.
Data Source
AI summary
An object of the driving assistance device is to provide a driving assistance device capable of preventing the driver from experiencing discomfort. The driving assistance device includes a target deceleration pattern generating unit that generates a target deceleration pattern for deceleration driving and a start position determining unit that determines a deceleration start point where the deceleration driving starts on the basis of the target deceleration pattern. The target deceleration pattern unit generates the target deceleration pattern including a first deceleration pattern in which deceleration in a section from a predetermined position to a target stop position is set and a second deceleration pattern in which deceleration in a section to the predetermined position is set. The deceleration in the first deceleration pattern is more than the deceleration in the second deceleration pattern.