Vehicle Motion Manager for Brake Hold Switching Reliability

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Solution Overview

Problem

Existing motion managers face difficulties in maintaining a vehicle's stopped state when a stop holding request is interrupted during the transition from a hydraulic brake to an electric parking brake, leading to the electric parking brake becoming unnecessary and failing to keep the vehicle stationary.

Innovation Solution

A motion manager that continues to output an instruction value for turning ON the parking brake until its state is completed, regardless of the presence or absence of the stop holding request, and switches to turning OFF the hydraulic brake based on specific conditions such as road slope and driver intent.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the motion manager outputs an instruction value for turning ON the parking brake only when a stop holding request is received, then the control logic is simple and responsive to driver intent, but the parking brake may not be activated in time if the request is interrupted during brake switching

Engineering Contradiction:

Improvereliability of maintaining stopped stateVSAvoidcomplexity of control logic

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The motion manager starts outputting the instruction value for the parking brake in advance before the stop holding request is interrupted, ensuring the parking brake is activated even if the request is later cancelled. This preliminary action guarantees the vehicle remains stopped despite request interruptions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The instruction value for the parking brake is continued to be output until the brake switching is complete, regardless of whether the stop holding request is still present. This continuous action ensures the parking brake remains activated throughout the transition period, maintaining the stopped state reliably.

Inventive Principle:

Principle #20Continuity of useful action

2Reliability

If the motion manager switches from hydraulic brake to parking brake upon receiving a stop holding request, then the vehicle can be kept stopped, but the transition may be interrupted causing loss of stopped state maintenance

Engineering Contradiction:

Improvereliability of brake switchingVSAvoidease of brake control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system prepares the parking brake activation in advance by starting to output its instruction value before the actual switching is needed. This preliminary preparation ensures that if the stop holding request is interrupted during transition, the parking brake is already activated or will be activated immediately, maintaining the stopped state without requiring complex intervention.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The motion manager continues outputting the parking brake instruction value as a buffer during the transition period, creating a safety margin that protects against request interruptions. This cushioning approach ensures smooth transition without risking loss of stopped state maintenance.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If the motion manager interrupts the stop holding request after brake switching starts, then the system responds to changing driver intent, but the parking brake activation may be cancelled prematurely

Engineering Contradiction:

Improveadaptability to driver intent changesVSAvoidreliability of parking brake activation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The motion manager maintains continuous output of the parking brake instruction value throughout the brake switching process, regardless of whether the stop holding request is still present. This continuity ensures the parking brake activation completes successfully even if the driver's intent changes and the request is interrupted, while still allowing the system to adapt to new intent after switching completes.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system dynamically adjusts the stop holding request duration based on brake switching status. The request is maintained longer than usual during active switching to ensure parking brake activation completes, creating a dynamic adaptation that balances responsiveness to driver intent with reliability of brake activation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12427955B2Motion manager and information processing method

Publication Date: 2025.09.30 TOYOTA JIDOSHA KK

AI summary

A motion manager includes one or more processors configured to: receive a stop holding request for keeping a vehicle in a stopped state as one of motion requests from application software; and output an instruction value for turning ON a hydraulic brake to the hydraulic brake on a condition that the stop holding request is received. The one or more processors are configured to continue outputting the instruction value to a parking brake regardless of a presence or absence of the stop holding request, when outputting an instruction value for turning ON a parking brake to the parking brake after starting outputting the instruction value and until switching of the parking brake to an ON state is completed.