Vehicle Acceleration Control During Preceding Vehicle Stabilization

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Solution Overview

Problem

Existing vehicle control systems fail to accurately maintain inter-vehicle distance when stabilization controls are executed in the preceding vehicle, leading to unpredictable acceleration and deceleration of the own vehicle, resulting in inaccurate following of the preceding vehicle.

Innovation Solution

A control apparatus equipped with an inter-vehicle distance detection device, wireless communication for acquiring requested and actual acceleration information from the preceding vehicle, and an acceleration control device that calculates feedback and feedforward accelerations to maintain a target inter-vehicle distance, setting feedforward acceleration to zero during stabilization controls to prevent unnecessary distance reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If feedforward requested acceleration is calculated based on requested acceleration sent from the preceding vehicle during stabilization control, then the own vehicle can respond quickly to acceleration requests, but the inter-vehicle distance decreases unnecessarily because the preceding vehicle's actual acceleration does not match the requested acceleration

Engineering Contradiction:

Improveresponse speed of own vehicle to acceleration requestsVSAvoidaccuracy of inter-vehicle distance maintenance

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The control apparatus uses feedback control by calculating feedback requested acceleration based on the difference between actual inter-vehicle distance and target inter-vehicle distance. This feedback mechanism ensures that the own vehicle maintains accurate following distance by continuously adjusting acceleration based on real-time distance measurements, rather than relying solely on feedforward commands from the preceding vehicle.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the parameter used for acceleration control by switching between using requested acceleration (during normal operation) and actual acceleration (during stabilization control). When stabilization control is detected, the system uses actual acceleration values from the preceding vehicle to calculate feedforward requested acceleration, ensuring accurate following without unnecessary distance reduction.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the own vehicle accelerates based on requested acceleration during stabilization control, then the own vehicle follows the preceding vehicle's acceleration commands, but the preceding vehicle does not accelerate at the requested rate due to friction braking, causing inaccurate following

Engineering Contradiction:

Improveability to follow preceding vehicle's acceleration commandsVSAvoidaccuracy of following the preceding vehicle

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system dynamically adapts its control strategy based on the operating state of the preceding vehicle. When stabilization control is detected, the system switches to using actual acceleration values instead of requested acceleration values. This dynamic adaptation allows the own vehicle to accurately follow the preceding vehicle's actual motion rather than blindly following commands that may not be executed.

Inventive Principle:

Principle #15Dynamics

3Reliability

If vehicle travel stabilization control is executed in the preceding vehicle, then the preceding vehicle's wheels are prevented from locking or slipping, but the actual acceleration does not correspond to the operation amount of the acceleration pedal

Engineering Contradiction:

Improvestability of preceding vehicle during braking or accelerationVSAvoiddiscrepancy between requested and actual acceleration information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The control apparatus uses actual acceleration information as an intermediary to bridge the gap between the preceding vehicle's acceleration commands and actual motion. During stabilization control, the system relies on actual acceleration measurements rather than requested acceleration values, effectively using the actual motion as a mediator to ensure accurate following despite the discrepancy caused by stabilization control interventions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10118616B2Control apparatus of vehicle

Publication Date: 2018.11.06 TOYOTA JIDOSHA KK

AI summary

A control apparatus of a vehicle for causing an own vehicle to travel following a preceding vehicle calculates a requested acceleration of the own vehicle on the basis of a feedback requested acceleration to maintain an inter-vehicle distance at a target distance and a feedforward requested acceleration to cause the own vehicle to travel following the preceding vehicle. The apparatus calculates the feedforward requested acceleration on the basis of information on an acceleration of the preceding vehicle sent from the preceding vehicle through a wireless communication. The apparatus sets the feedforward requested acceleration to zero when a vehicle travel stabilization control is executed in the preceding vehicle to control a friction braking force applied to at least one of vehicle wheels of the preceding vehicle to stabilize a travel of the preceding vehicle, and the feedforward requested acceleration is larger than zero.