Platoon Vehicle Drive Output Control for Stable Intervehicle Distance

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Solution Overview

Problem

In platooning systems, differences in drive amount change characteristics among vehicles lead to variations in intervehicle distance, causing velocity discrepancies and unstable platooning due to differing torque responsiveness and output ranges.

Innovation Solution

A vehicle control device and method that sets a permissible output range for drive amount with the current gear ratio of automatic transmission, restricting the change rate of drive amount to maintain consistent intervehicle distance by limiting torque output and shifting schedules, ensuring that drive amount changes align within predetermined ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the drive amount is changed in accordance with the change of the drive demand amount, then the responsiveness to driver input is improved, but difference in vehicle velocity occurs among the platoon participating vehicles, causing the intervehicle distance to vary

Engineering Contradiction:
Improvevehicle velocityVSAvoidintervehicle distance
Core Design Contradiction:
SpeedVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the drive amount change characteristic parameter based on platoon formation status. When platoon formation is detected, the control device modifies the drive amount change rate parameter to a restricted value, ensuring uniform response across all vehicles. This parameter adjustment resolves the contradiction by maintaining velocity consistency (stability) while still allowing controlled responsiveness to driver input.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If the automatic transmission shift control is optimized for individual vehicle performance, then the drive amount responsiveness is improved, but the drive amount change characteristic differs among platoon participating vehicles, leading to unstable platooning

Engineering Contradiction:
Improvedrive amount responsivenessVSAvoidplatooning stability
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent implements universality by establishing a common drive amount change characteristic that applies to all platoon participating vehicles. The control device detects platoon formation and enforces a standardized drive amount restriction across the entire platoon, ensuring that all vehicles respond uniformly to acceleration requests. This universal approach maintains platooning stability while preserving adequate drive responsiveness through controlled parameter adjustment.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Stability of the object's composition

If the drive amount change rate is restricted to maintain consistent intervehicle distance, then the platooning stability is improved, but the responsiveness to drive demand changes is reduced

Engineering Contradiction:
Improveplatooning stabilityVSAvoiddrive amount responsiveness
Core Design Contradiction:
Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent applies dynamics by making the drive amount change characteristic adjustable based on operational context. The control device dynamically switches between normal drive amount characteristics (for individual vehicle operation) and restricted drive amount characteristics (for platoon operation). This dynamic adaptation resolves the contradiction by providing high responsiveness when needed for individual performance while ensuring stability when platooning is active, optimizing both aspects under different conditions.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS11999340B2Vehicle control device, vehicle control method, and program for causing computer to implement vehicle control function
Publication Date: 2024.06.04 TOYOTA JIDOSHA KK
  • US11999340B2 patent drawing
  • US11999340B2 patent drawing
  • US11999340B2 patent drawing

AI summary

A vehicle control device for controlling platooning of platoon participating vehicles by connecting the platoon participating vehicles to one another via radio communication, the platoon participating vehicles include a lead vehicle and follow-up vehicles that perform automatic follow-up running in line at a predetermined intervehicle distance from the lead vehicle, the device comprises a control portion that, during execution of the platooning, sets a permissible output range of a drive amount with a current gear ratio of an automatic transmission remaining kept, as a change characteristic of the drive amount in each of the platoon participating vehicles so that change of the drive amount in response to change of a drive demand amount lies within a predetermined range, the automatic transmission being included in each of the platoon participating vehicles to transmit power of a power source to driving wheels.