A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.
A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.
Each KCU-BCM integrates 56 signal inputs, 50 power/actuator outputs, four sensor-supply channels, and multiple in-vehicle networks.
Front and rear BCMs use identical hardware: the front unit aggregates strategy and diagnostics, while the rear unit executes rear-body I/O over CAN FD.
Designed for 9–32 V commercial-vehicle electrical systems, with up to 200 A and 2,000 W per module plus per-channel electrical diagnostics and protection.
Think of KCU-BCM as the sensing, decision, and protected power-distribution center for body electronics. It reads switches, sensors, and network commands, evaluates vehicle state, then safely drives doors, lighting, wipers, fans, and other 24 V loads.
Receives body switches, sensors, and commands from other ECUs while managing the 9–32 V supply and wake-up sources.
The S32K344 executes body strategies, interlocks, diagnostics, and security, then decides when each load may operate.
Current-monitored, fault-protected driver stages operate the front and rear body equipment.
Both units use identical hardware and are placed near their local wiring. Strategy stays in the front BCM; the rear BCM executes nearby outputs and returns diagnostics.
Runs body strategy, state machines, safety evaluation, diagnostic aggregation, and the UDS gateway, while controlling front lighting, front doors, wipers, horn, EPS, and front ADAS power.
Controls rear lighting, rear doors, cooling fans, pumps, rear cameras, and cabin electronics, and reports local open-load, short-circuit, over-current, and over-temperature faults.
Important: Master/Slave describes functional responsibility, not redundancy. Roles do not fail over automatically; the rear BCM enters its defined safe state if the master is lost.
| Switch-to-ground (SG) | 28 channels | active-low, wake-up capable |
|---|---|
| Programmable switch (SP) | 16 channels | configurable active high/low, wake-up capable |
| Frequency input | 4 channels | wheel-speed, rotation-speed, or pulse signals |
| Analog input | 4 channels | 0–5 V DC |
| Resistive input | 4 channels | 2 × 100 Ω–200 kΩ; 2 × 100 Ω–2 kΩ |
| HSD 30 A | 1 channel | highest-priority load such as EPS |
|---|---|
| HSD 20 A | 3 channels | fans, pumps, and blowers |
| HSD 15 A | 10 channels | headlamps, wipers, horns, and heaters |
| HSD 5 A | 6 channels | turn, brake, reverse lamps, and DRL |
| HSD 3 A | 8 channels | marker/door lamps and ADAS/camera/IVI |
| HSD 1 A | 8 channels | LEDs, displays, and low-power modules |
| Half-bridge 4.5 A | 6 channels | bidirectional actuation; thermal simulation in progress |
|---|---|
| Low-side driver 3 A | 8 channels | buzzers, relays, and low-power actuators |
| 5 V sensor supply | 2 channels | 50 mA each with short/over-current protection |
| 12 V sensor supply | 2 channels | 100 mA each with short/over-current protection |
| Output protection | Open-load, short-to-ground/battery, over-current, and over-temperature detection |
| CAN FD | 3 channels | one wake-up channel; VCU, T-BOX, ADAS, and Inter-BCM |
|---|---|
| LIN Master | 1 channel | wake-up capable for HVAC and local subnetworks |
| 100BASE-T1 | 1 optional channel | high-speed diagnostics and OTA |
| Address setting | 4-bit | identifies front/rear BCM nodes |
| Inter-BCM | Dedicated CAN FD protocol; signal synchronization requirement ≤ 100 ms |
| MCU | NXP S32K344 | Arm Cortex-M7 Lockstep, up to 160 MHz |
|---|---|
| Memory | 4 MB Flash / 512 KB RAM |
| Hardware security | HSE, Secure Boot, and protected key storage |
| Functional-safety mechanisms | Lockstep, RAM/Flash ECC, window watchdog, voltage/clock monitoring |
| Firmware update | AB Swap dual-partition update with rollback |
| Operating voltage | 9–32 V DC |
|---|---|
| Output capability | Up to 200 A and 2,000 W per module |
| Input protection | Reverse-polarity and automotive transient protection |
| Low-power mode | Sleep/LPOFF with CAN, LIN, ACC/IGN, and external-input wake-up |
| Environment | -40 °C to +85 °C; target IP67 / ISO 16750 |
Specifications reflect the EVT-stage product specification. Ethernet is optional, half-bridge 4.5 A thermal simulation remains in progress, and final connectors, dimensions, and weight are subject to the released technical document.
A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.
We can help plan BCM integration around vehicle platform topology, front/rear body layout, 24V loads, diagnostics, and Inter-BCM communication.
