Occupancy Monitoring System (OMS)

Occupancy Monitoring System (OMS)

The Occupancy Monitoring System (OMS) is a vital active safety and intelligent interaction technology within the modern smart vehicle cabin. By integrating in-cabin near-infrared (NIR) cameras, millimetre-wave (mmWave) radars, and deep learning vision algorithms, it performs 24/7, high-precision real-time monitoring and intelligent analysis of the physiological state, body posture, seating distribution, and actions of all occupants other than the driver. As a core component of the In-Cabin Monitoring System (IMS), OMS is evolving from a single-purpose feature into a critical system that safeguards the lives of all cabin occupants while powering proactive intelligent interactions.

Core Technical Architecture and Operating Principles

The technical architecture of OMS primarily comprises multi-modal in-cabin sensing hardware and a high-compute cockpit domain controller, establishing a seamless pipeline from data acquisition to intelligent analysis.

At the sensing layer, the system typically employs a sensor fusion setup combining NIR cameras with roof-mounted mmWave radars. The infrared camera clearly captures subtle occupant movements and postures even in pitch-black conditions, whilst the mmWave radar penetrates obstructions such as blankets to detect faint chest movements, achieving blind-spot-free, all-weather coverage of vital signs in the cabin. Tier-1 suppliers like Fosera Automotive Electronics integrate active IR-LED illumination into camera modules, substantially boosting image contrast and algorithmic recognition rates in night-time and low-light environments.

At the decision-making layer, the system leverages the AI compute power of the cockpit chipset to perform real-time inference on captured images and point cloud data. The algorithms can accurately recognise faces for identity authentication, verify if rear child safety seats are properly installed, evaluate occupant seating postures (preventing secondary airbag injuries caused by improper reclining during a collision), and execute Child Presence Detection (CPD).

Key Application Scenarios

The applications of OMS span two key dimensions: occupant protection and intelligent interaction. On the safety front, the most critical capability is Child Presence Detection (CPD), which promptly detects children or pets left behind in the cabin and triggers alerts to prevent tragedies. Concurrently, by identifying occupant height, build, and posture, the system provides vital inputs for adaptive airbag deployment, mitigating the risk of injury to children or smaller-stature occupants during a crash.

On the interaction front, OMS supports full-cabin facial recognition to identify each passenger and synchronise personalised settings. For instance, the ONVO L60 utilises SenseAuto's OMS technology to recognise and store up to 20 user profiles, proactively playing preferred media content for different passengers. The system can also recognise gestures and facial expressions, allowing the vehicle to autonomously adjust the ambient mood and curate content based on occupant status, elevating the user experience from 'passive response' to 'proactive care'.

Industry Trends and Safety Guidelines

The technical roadmap of OMS is accelerating its transition from 'hardware-dependent' to 'software-defined'. Aptiv's Advanced Occupant Classification (AOC) system is the industry's first occupant detection solution purely based on in-cabin cameras, eliminating traditional in-seat pressure sensors. By repurposing existing cameras, it accurately distinguishes between adults, children, infants in child seats, and inanimate objects, slashing BOM costs by up to 40%. Meanwhile, Magna has introduced a rear-view mirror-integrated DMS/OMS solution that consolidates sensing hardware and algorithms into a single assembly, signifying that in-cabin sensing is shifting from an optional add-on to a baseline vehicle platform component.

There are strict safety protocols governing the use of OMS. In-cabin cameras must never be deliberately obstructed; without the dynamic posture tracking provided by OMS, airbags cannot deploy adaptively based on occupant build and posture during a collision, significantly heightening the risk of fatal injuries. Furthermore, motorists must never rely solely on the OMS Child Presence Detection feature to leave children or pets unattended in the vehicle, as electronic sensors remain susceptible to failure caused by power loss or technical faults.