Child Presence Detection Support Device
幼児置き去り防止支援装置

BackgroundChildren left in cars or courtesy buses have become a social problem.

Response to an accident of a child left in a courtesy bus inlast September
・Obligation to install a safety device in a courtesy bus
・MLIT‘s guidelines for safety device
ECU

European new vehicle safety test programChild Presence Detection (CPD) test required byEuro NCAP started in 2023.

Confirmation button

Kokodayo button

The voice guiderepeatedly says “Pleasecheck the interior. Afterconfirming that nobody is
inside, press the button atthe back.

Interior warning(Outsourced speaker)① Development of a safety device that helps thedetection of child presence in a courtesy bus② Development of a CPD mmWave sensor

① CPD Support Safety Device for Courtesy Buses(Compliant With MLIT Guidelines: Getting Off Confirmation Type)
送迎用バスの置き去り防止を支援する安全装置（国交省ガイドライン準拠/降車時確認式）

Purpose

Bring a MLIT guideline-compliant safety device to market to contributed to CPD.
(Development of an ECU, a confirmation button, and a Kokodayo button)

OutlineMass-produced products are used for short-term development and for the quality of the on-board devi
The device can be retrofitted to vehicles already used without any change in the on-board ECU.
User-friendly even for the first-time drivers.
Process① Ignition key ACC ⇒ LOCKThe voice guide repeatedly says “Pleasecheck the interior. After confirming that
② Voice-guided interior warning
nobody is inside, press the button at theback.
② Interior warning ③ A driver checks the interior(Outsourced
according to voice guide andspeaker)press the confirmation button
at the back to stop the warning.

①Ignition keyECU③ Confirmation
button

A car horn intermittently honks.
Hazard lights on.
Exterior warning

Kokodayo button

If the confirmation button is notpressed,⇒ Exterior warning(4 minutes later)
If a child left inside presses theKokodayo button,⇒ External warning

② CPD Millimeter Wave Sensor
幼児置き去り検知ミリ波センサー

Purpose

Contribute to CPD in anticipation of the Euro-NCAP evaluation criteria to be reviewed in 2025

Outline・A mmWave sensor installed overhead detects a living body in the car.
・The device responds to the Euro NCAP CPD requirements:① Children up to 6 years old including infants in a rearward-facing CRS② Entire interior space including the floor③ Children under blanket or sunshade

・ A single sensor is available for a two-row seat car. The interior andexterior spaces are effectively segmented to prevent false detection.
Millimeter wave sensor

Living body detection
A mmWave sensor detects thedisplacement (body motion) of a reflector.

A child has been
detected!

Outline
Millimeter wave sensor

Interior dynamic body map
Hazard lightsHornMillimeter wave sensing

Determination of a child left

Notification to amobileeCall, activation of air
conditioner, etc.

Initialwarning＋

Initial warning

Staged warning

Intervention

Example of system operation
Millimeter wavesensor

Product example: Front overhead

Product example: Stand-alone module

・The wide-angle and high-angle resolution antenna module distinguishes between the interior andexterior of a two-row seat car with a single sensor.
・The lightweight algorithm accurately locates a living body.
Received signal(IF signal)

Range
FFT

60 GHz Radar module

Dynamic body

Phase variation
is extracted

Reflection
intensity

Stationarybody

25 mmAppearance

Removal of
stationary body

IQ data is obtainedat each distanceNo living
bodyInterior

The effect of a high reflective
stationary body is removed

Determination(SVM)

Angle estimation(Capon)Distance

TechnologyAngle

LivingbodyFeature amount is extracted
to make a determination

High precision lightweight algorithm
A child under the first row seat

27 mm
Antennas: 3Tx × 4Rx

Dynamic body map

Millimeterwave sensor

A childinside⚫ Method: FMCW
⚫ Communication: UART/CAN interface⚫ Operating temperature: -40 ℃ to +85 ℃
-60

-40

-200204060

A child in a rearward-facing CRS
in a second row seatangle [deg]Features⚫ Consumption current: 350 mA (Avg.)
1.0 A (Peak)A child under the second row seat

Dynamic body map

Dynamic body map⚫ Detection angle (of a male adult)

A child
insideAn adult
outside:±70 deg.

A child
inside-60

Antenna, CPU and DSP built-in module-40-200angle [deg]2040-60-40-200angle [deg]60Child’s breathing can be detectedin and under any of the seats.

Results of child detection in a two-row seat car

204060Specifications

・Stand-alone module
54 mm64 mm16.7 mm

・Built in front overhead
2024まで2025以降Power supply voltage

12 V

Operating temperature
range-40 to +85 ℃

Consumption current

Avg. 350 mA, Peak 1.0 A

Interface

CAN FD (consultation available)

Applicable vehicle
types

Small to large (two-row seat cars）

Future use■ Privacy-conscious watch-over systems ⇒ Detection of falling or other problems with a person watched overNursing homes■ Contactless vital signs monitoring

Hospitals

Living rooms

Bathrooms⇒ Healthcare and detection of sleep apnea and other health problems
Breathing

Pulse