Motor Vehicle Hands-Free Device Boot Sequence Control

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Solution Overview

Problem

Existing motor vehicle hands-free devices experience an unwanted interruption during telephone calls due to premature establishment of Bluetooth connections before the telephony program has fully booted, causing audio signals to be lost and disrupting conversations.

Innovation Solution

Implementing a control device that boots after vehicle activation and sends a trigger message upon completion, ensuring the radio connection is established only after the telephony program is loaded, allowing seamless audio signal transfer from the mobile phone to the motor vehicle's loudspeakers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the Bluetooth connection is established immediately after activation, then the connection speed is improved, but audio signal loss occurs due to premature connection before telephony program completion

Engineering Contradiction:

ImproveConnection establishment speedVSAvoidAudio signal loss

Core Design Contradiction:

SpeedVSLoss of information

Solution Approach 1:

The system performs preliminary booting of the telephony program and readiness check before establishing the Bluetooth connection. The control device boots the telephony program and determines whether it is ready to process audio signals before allowing connection, preventing audio signal loss while maintaining fast connection establishment.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the Bluetooth connection is delayed until telephony program completion, then audio signal loss is prevented, but connection establishment time increases

Engineering Contradiction:

ImproveAudio signal integrityVSAvoidConnection establishment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The control device continuously monitors the booting status of the telephony program and provides feedback to the hands-free device. When the telephony program is ready, the control device sends a readiness signal, allowing the Bluetooth connection to be established immediately, thus preventing audio signal loss while minimizing connection delay.

Inventive Principle:

Principle #23Feedback

3Reliability

If the hands-free device waits for boot completion before connection, then audio processing reliability is improved, but the overall system responsiveness deteriorates

Engineering Contradiction:

ImproveAudio processing reliabilityVSAvoidSystem responsiveness

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The telephony program is booted in advance during system initialization, and the control device determines readiness before connection establishment. This preliminary action ensures that when the Bluetooth connection is made, the audio processing is immediately reliable, maintaining both reliability and responsiveness.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2289232B1Motor vehicle having a hands-free device

Publication Date: 2015.01.28 BAYERISCHE MOTOREN WERKE AG

Figure 1

AI summary

The invention relates to a motor vehicle comprising a control device (HU) and a hands-free device (FSE), wherein the hands-free device (FSE) has a radio interface to exchange data with a mobile phone (TEL). The control device (HU) is booted once the motor vehicle is activated and a message is transmitted from the control device (HU) to the hands-free device (FSE) triggered by the successful completion of booting of the control device (HU). A radio connection is established between the hands-free device (HU) and a mobile phone (TEL) triggered by the reception of the message by the hands-free device (FSE).