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Electro-Mechanical Braking (EMB) Fail-Safe System

Overview

The electro-mechanical braking (EMB) system incorporates a smart wheel end actuator (WEA) that combines the actuator control unit (ACU), PMSM/BLDC motor, power conversion mechanism, transmission mechanism, and brake caliper into a single compact electro-mechanical subsystem. In response to parking brake requests or service braking commands, the actuator produces the necessary brake clamping force to achieve the desired braking torque.

The ACU is based on an MCU and integrates multiple ASIL-rated devices and MCAL software to support an ASIL-ready fail-safe architecture. Redundant communication interfaces improve functional safety and system availability, while integrated motor control enables precise brake actuation during both normal operation and fault conditions.

System Benefits:

  • Supports ASIL D readiness with ASIL-compliant Renesas devices, MCAL software drivers, and implemented safety goals.
  • Reduces platform redesign effort by supporting 12V, 24V, and 48V systems with a common gate driver and a common footprint for 40V, 60V, and 80V REXFET TSC/BSC packages.

Block Diagram

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WS203-1:WEBConnector Line.1365Connector Line.1368Connector Line.1360Connector Line.1376Dynamic connectorLineLine.1411Connector Line.1192Connector Line.1194Connector Line.1366Connector Line.1367Line.1493Line Dotted Arrow.1476WS203WS203WS203Tri component non RenesasComponent block.745Component block.631CAN + Ethernet with Wake-UpCAN + Ethernet with Wake-UpCAN + Ethernetwith Wake-UpBLDC MotorSquare.40Inductor.10Sheet.1504Sheet.1505Sheet.1506Inductor.14Sheet.1508Sheet.1509Sheet.1510Inductor.18Sheet.1512Sheet.1513Sheet.1514Dynamic connectorDynamic connector.27Dynamic connector.25SquareSheet.1519Square.41Sheet.1521Sheet.1522Sheet.1523Connector Line.1364Connector Line.1377Connector Line.1387Fail-Safe OutputFail-Safe OutputFail-Safe OutputPhase Cutoff SwitchPhase Cutoff SwitchPhase Cutoff SwitchReverse Polarity Protection with Supply Cutoff SwitchReverse Polarity Protection with Supply Cutoff SwitchReverse Polarity Protection with Supply Cutoff SwitchDotted Line.1396Dotted Line.1397Dotted Line.1398Dotted Line.1399Wheel End Actuator (Fail-Safe Architecture)Wheel End Actuator (Fail-Safe Architecture)Wheel End Actuator (Fail-Safe Architecture)Connector Line.1402Connected signals line.145812/24/48V Battery Supply12/24/48V Battery Supply12/24/48V Battery SupplyDiode.1462Sheet.1650Sheet.1651Sheet.1652Line.1470Line.1473Line Dotted Arrow.1474Line Dotted Arrow.1475Dotted Line.1477INHINHINHLine Dotted Arrow.1479Line Dotted Arrow.1480Dotted Line.1481Line.1487ENENENENENENLine.1495Connector Line.1361Line.1676Line.1677MOSFETs:
48V: REXFET 80V, 1.60-3.5mΩ
24V: REXFET 60V, 1.08-2.5mΩ
12V: REXFET 40V, 0.50-2.0mΩMOSFETs: 48V: REXFET 80V, 1.60-3.5mΩ 24V: REXFET 60V, 1.08-2....MOSFETs:48V: REXFET 80V, 1.60-3.5mΩ24V: REXFET 60V, 1.08-2.5mΩ12V: REXFET 40V, 0.50-2.0mΩWheel Speed SensorWheel Speed SensorWheel Speed SensorA-ECU/MCU/ZCUA-ECU/MCU/ZCUA-ECU/MCU/ZCUForce SensorForce SensorForce SensorBrake PedalBrake PedalBrake Pedal 24/48V to 12V DC/DC24/48V to 12V DC/DC24/48V to 12V DC/DCGate driverGate DriverGate DriverPMICPMICPMICInductive Position SensorInductive Position SensorInductive Position SensorCurrent-Controlled Solenoid DriverCurrent-Controlled Solenoid DriverCurrent-Controlled Solenoid DriverPark SolenoidPark SolenoidPark Solenoid3-Phase Gate Driver3-Phase Gate Driver3-Phase Gate DriverSheet.1685MCUMCUMCUSPISPISPIADCADCADCPWMPWMPWMSPISPISPIADC 3ADC 2ADC 2.136ADCADCADCSENTSENTSENTADCADCADCGPIOGPIOGPIOEthernetEthernetEthernetPeripheral DualGPIO .477CANCANCANPWMPWMPWMSheet.1686Component block.745Component block.631MOSFETMOSFETMOSFETSheet.1452N-Channel Depletion MOSFET.1203Sheet.1454Sheet.1455Sheet.1456Sheet.1457Sheet.1458Sheet.1459Sheet.1460Sheet.1461Sheet.1462Sheet.1463Sheet.1464Sheet.1465Connect.50Sheet.1467Sheet.1468Sheet.1469N-Channel Depletion MOSFET.1220Sheet.1471Sheet.1472Sheet.1473Sheet.1474Sheet.1475Sheet.1476Sheet.1477Sheet.1478Sheet.1479Sheet.1480Sheet.1481Sheet.1482Connect.50Sheet.1484Sheet.1485Sheet.1486ShuntSheet.1488Sheet.1489Sheet.1490Ground - Earth.1241Sheet.1492Sheet.1493Sheet.1494Sheet.1495LineLine.1671RshuntRshuntRshuntDotted Line.1674Dotted Line.1675Dotted Line.1678MOSFETMOSFETMOSFETDotted Line.1679Line Dotted Arrow.1673Sheet.1687MOSFETMOSFETMOSFETN-Channel Depletion MOSFET.1283Sheet.1525Sheet.1526Sheet.1527Sheet.1528Sheet.1529Sheet.1530Sheet.1531Sheet.1532Sheet.1533Sheet.1534Sheet.1535Sheet.1536Connect.50Sheet.1538Sheet.1539Sheet.1540N-Channel Depletion MOSFET.1300Sheet.1542Sheet.1543Sheet.1544Sheet.1545Sheet.1546Sheet.1547Sheet.1548Sheet.1549Sheet.1550Sheet.1551Sheet.1552Sheet.1553Connect.50Sheet.1555Sheet.1556Sheet.1557N-Channel Depletion MOSFET.1317Sheet.1559Sheet.1560Sheet.1561Sheet.1562Sheet.1563Sheet.1564Sheet.1565Sheet.1566Sheet.1567Sheet.1568Sheet.1569Sheet.1570Connect.50Sheet.1572Sheet.1573Sheet.1574Connector Line.1337Connector Line.1338Connector Line.1339Connector Line.1334Connector Line.1335Connector Line.1336Sheet.1688MOSFETMOSFETMOSFETSheet.1612N-Channel Depletion MOSFET.1420Sheet.1614Sheet.1615Sheet.1616Sheet.1617Sheet.1618Sheet.1619Sheet.1620Sheet.1621Sheet.1622Sheet.1623Sheet.1624Sheet.1625Connect.50Sheet.1627Sheet.1628Sheet.1629N-Channel Depletion MOSFET.1107Sheet.1631Sheet.1632Sheet.1633Sheet.1634Sheet.1635Sheet.1636Sheet.1637Sheet.1638Sheet.1639Sheet.1640Sheet.1641Sheet.1642Connect.50Sheet.1644Sheet.1645Sheet.1646Line.1669Line.1670

MOSFET

Power MOSFETs

PMIC

Automotive ASIL D and ASIL B general-purpose PMICs with a high-voltage front end optimized for MCU power. They integrate a high-voltage buck/boost controller, a low-voltage synchronous buck controller, and five LDOs, including two configurable trackers.
Multi-Channel Power Management ICs (PMICs)

Brake Pedal

Inductive Position Sensors

MCU

ASIL-compliant 32-bit MCU integrating processing, memory, and communication interfaces for reliable control, sensing, and real-time operation in automotive and robotic applications while enabling compact, high-performance system designs.
RH850 Automotive MCUs

Inductive Position Sensor

ASIL-compliant inductive position sensor with magnet-free technology that provides precise absolute rotary position sensing through eddy-current detection for reliable motor control in safety-critical applications and compact, robust system designs.
Inductive Position Sensors

Force Sensor

Sensor Signal Conditioners (SSC/AFE)

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