One-Pedal Vehicle Deceleration Control on Curves and Slopes
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Solution Overview
Problem
Existing vehicle control systems in one-pedal mode fail to provide accurate deceleration control on roads with varying directions, such as winding roads with curves and slopes, leading to inadequate deceleration feeling and driver anxiety.
Innovation Solution
A control device and system that utilize deceleration maps generated from traveling history data to calculate and control deceleration levels based on the current traveling direction and position, allowing for automatic adjustment of braking force to match the specific deceleration requirements of each direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If average deceleration is calculated in a predetermined range on the road and set for each range, then deceleration control can be simplified, but the deceleration does not accurately indicate deceleration in each traveling direction
Solution Approach 1:
The patent segments the road space into multiple regions and creates separate deceleration maps for each region. Each deceleration map contains deceleration information specific to that region and traveling direction, allowing the system to select the appropriate map based on current position and direction. This segmentation enables direction-specific deceleration control without requiring complex real-time calculations.
Solution Approach 2:
The patent pre-calculates and stores deceleration information for multiple regions and traveling directions in deceleration maps before actual vehicle operation. By preparing these maps in advance based on historical traveling data, the system avoids complex real-time calculations and can quickly retrieve appropriate deceleration values during vehicle operation, improving both accuracy and response speed.
2Measurement precision
If deceleration maps with multiple traveling directions are used, then appropriate deceleration feeling can be provided for each direction, but the system complexity increases
Solution Approach 1:
The patent creates a universal deceleration map structure that can handle multiple traveling directions using the same data format and retrieval logic. The deceleration maps are organized in a standardized manner that allows the system to select and apply the appropriate map based on current conditions, providing multi-directional control capability without requiring fundamentally different system structures for each direction.
Solution Approach 2:
The patent introduces an intermediary layer (the deceleration map selection mechanism) that translates complex multi-directional requirements into simple map retrieval operations. The ECU acts as an intermediary that receives current position and direction information, selects the appropriate pre-prepared deceleration map, and applies the corresponding deceleration control, thereby simplifying the overall system architecture.
3Measurement precision
If deceleration is controlled based on current position and traveling direction, then appropriate deceleration feeling is provided, but more data processing is required
Solution Approach 1:
The patent pre-processes traveling history data to create deceleration maps that contain pre-calculated deceleration information for various regions and directions. During actual vehicle operation, the system only needs to retrieve the appropriate pre-computed values from these maps based on current position and direction, avoiding the need for complex real-time data processing and significantly improving processing efficiency.
Solution Approach 2:
The patent creates simplified copies of deceleration information in the form of deceleration maps that are stored in the ECU or server. These maps are condensed versions of the original traveling history data, containing only the essential deceleration information needed for control decisions. By using these compact copies instead of processing the full historical dataset in real-time, the system achieves high precision control with minimal processing overhead.
Data Source
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AI summary
A control device for a vehicle (2) configured to travel in a one-pedal mode in which driving and braking are controlled in response to operations on only an accelerator pedal is configured to control a braking force of the vehicle (2) by using deceleration maps in which decelerations in a plurality of traveling directions are set for any points based on traveling history data, and calculate, during traveling in the one-pedal mode, a deceleration level based on deceleration information associated with a current traveling direction and a current position of the vehicle (2) among pieces of deceleration information included in the deceleration maps.