SDAA524 October   2026 DRV3233-Q1 , DRV3263-Q1 , DRV8245-Q1 , LM74930-Q1 , TCAN1043HG-Q1 , TMAG6180-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Evolution of Braking Systems
      1. 1.1.1 Legacy Hydraulic Brake
      2. 1.1.2 Electrical Hydraulic Brake (EHB)
      3. 1.1.3 Electrical Mechanical Brake (EMB)
    2. 1.2 Why ASIL D is Required for EMB
    3. 1.3 How to Develop a Safe EMB System?
  5. 2Safety Goal and Safety Concept
    1. 2.1 EMB System Overview
      1. 2.1.1 Item Definition
      2. 2.1.2 Operational Situations
      3. 2.1.3 System Interface
    2. 2.2 EMB Safety Goal
      1. 2.2.1 Application Assumption
      2. 2.2.2 Hazard Analysis and Risk Assessment
      3. 2.2.3 Safety Goal
    3. 2.3 EMB Functional Safety Concept
      1. 2.3.1 Fail Tolerance Strategy
      2. 2.3.2 Functional Safety Concept
      3. 2.3.3 Functional Safety Requirements
  6. 3Proposed Design for ASIL D EMB
    1. 3.1 EMB System Safety Design Architecture
    2. 3.2 Hardware Component
    3. 3.3 Safety Mechanism Design
      1. 3.3.1 Power Management Safety Design
        1. 3.3.1.1 Ideal Diode Safety Analysis
        2. 3.3.1.2 DCDC safety analysis
        3. 3.3.1.3 PMIC Safety Analysis
      2. 3.3.2 Central Controller Safety Design
      3. 3.3.3 Communication Interface Safety Design
      4. 3.3.4 Actuator Safety Design
        1. 3.3.4.1 Braking Motor Driver Safety Analysis
        2. 3.3.4.2 Parking Driver Safety Analysis
      5. 3.3.5 Sensor Interface Safety Design
        1. 3.3.5.1 Position Sensor Safety Analysis
        2. 3.3.5.2 Wheel Speed Decoder Safety Analysis
        3. 3.3.5.3 Pedal Position Sensor Safety Analysis
  7. 4Summary
  8. 5References

1.1.3 Electrical Mechanical Brake (EMB)

The EMB system is a fully electronic braking system that triggers actuators (motors, sensors, control units) through electrical signals. Each wheel equipped with an EMB system. The EMB system converts the braking intention of the driver directly into mechanical braking. When the brake pedal is pressed by the driver, the sensors transmit signals to the electronic control unit (ECU), which calculates the braking force demand and sends the result to EMB actuator. The control command is sent to the EMB actuator using CAN communication. The caliper is then driven through BLDC motor produced clamping force.

In response to the shortcomings of the legacy and EHB systems, EMB replaces the traditional hydraulic braking system with motor braking, which provides more electronically, precise, and faster braking control than EHB.

Structures of Different Braking System Design Figure 1-1 Structures of Different Braking System Design