One-Pedal Vehicle Deceleration Maps for Direction-Aware Braking
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Solution Overview
Problem
Existing vehicle control systems fail to provide accurate deceleration control based on the traveling direction, leading to inadequate deceleration feeling and driver anxiety, especially on roads with varying slopes and curves.
Innovation Solution
A control device for vehicles that utilizes deceleration maps generated from traveling history data to set decelerations in multiple directions, allowing the electronic control unit to calculate and adjust deceleration levels based on the current traveling direction and position, reducing the need for manual operation and enhancing deceleration feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If average deceleration is calculated in a predetermined range on the road regardless of traveling direction, then the deceleration control is simplified, but the deceleration feeling becomes inaccurate and causes driver anxiety
Solution Approach 1:
The patent segments the deceleration control by creating separate deceleration maps for different traveling directions (e.g., uphill, downhill, left curve, right curve). Each map contains deceleration values specific to its direction, allowing the system to select the appropriate map based on current traveling direction. This segmentation resolves the contradiction by maintaining simplicity through automated map selection while achieving high precision through direction-specific deceleration values.
Solution Approach 2:
The patent adds the dimension of traveling direction to the deceleration control system. Instead of using a single-dimensional average deceleration value, the system creates multi-dimensional deceleration maps that incorporate direction as a key variable. The electronic control unit determines the current traveling direction and selects the corresponding map, thereby transforming the control from a simple scalar value to a direction-aware multidimensional approach that eliminates driver anxiety.
2Measurement precision
If deceleration maps for multiple traveling directions are used, then the deceleration feeling becomes accurate and appropriate, but the device complexity and data processing burden increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing deceleration values for various traveling directions in deceleration maps before actual vehicle operation. The maps are prepared in advance with deceleration values corresponding to different road conditions and directions, so that during vehicle operation, the electronic control unit only needs to determine the current direction and retrieve the appropriate value, avoiding complex real-time calculations and reducing processing burden.
Solution Approach 2:
The patent introduces deceleration maps as an intermediary between the vehicle's traveling state and the braking control system. The maps serve as a pre-processed data structure that translates complex road condition analysis into simple direction-based lookup tables. This intermediary layer simplifies the control system by replacing complex real-time analysis with efficient map-based retrieval, thereby maintaining high precision while reducing computational complexity.
3Ease of operation
If the electronic control unit automatically changes deceleration levels based on current traveling direction, then the driver burden is reduced and deceleration feeling is improved, but the calculation and data processing requirements increase
Solution Approach 1:
The patent uses copying by creating deceleration maps that replicate deceleration patterns for different traveling directions. Instead of performing complex real-time analysis of road conditions and calculating optimal deceleration values, the system copies pre-determined deceleration values from appropriate maps based on the current traveling direction. This copying approach significantly reduces calculation time and data processing requirements while maintaining high accuracy and improving ease of operation.
Data Source
AI summary
A control device for a vehicle 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 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 among pieces of deceleration information included in the deceleration maps.