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Electric Power Steering (EPS)  Favorite




Electric Power Steering (EPS) is favored over hydraulic power steering in most new vehicles. Eliminating the power steering pump can reduce weight and improve fuel economy. EPS also offers greater handling and steering feel while improving vehicle safety by adapting the steering torque to the vehicle's speed and providing active torque in critical driving situations.

The central electronic elements of today's electric power steering systems are modern 16- and 32-bit MCUs designed for safety-critical applications. Freescale's 16-bit and Qorivva 32-bit single and dual-core MCU provide enhanced computing power and specialized peripherals for complex electric motor control functions. Integrated power supply solutions are also important elements of a power steering control unit. They provide connectivity to automotive busses, such as CAN and LIN. For MOSFET power stages control, integrated pre-drivers are typically used to interface with the MCU directly or via SPI.

Target Applications

  • Electric Power Steering (EPS)
  • Electric Power Assisted Steering (EPAS)
Freescale Electric Power Steering (EPS) block diagram

Recommended Solutions


Products Features
Microcontrollers (MCU)
MPC574xP: Qorivva 32-bit MCU for Automotive and Industrial Functional Safety Applications Main 32-bit MCU for data processing, dual-core
MPC560xP: Qorivva 32-bit MCU for Chassis and Safety Applications Main 32-bit MCU for data processing, single core
MPC564xL: Qorivva 32-bit MCU for Chassis and Safety Applications Main 32-bit MCU for data processing, dual-core
S12G: Family 16-bit MCU Main 16-bit MCU for data processing, single-core
Watchdog Microcontrollers (MCU)
S12XS: 16-Bit Automotive Microcontroller Safety companion MCU, 16-bit MCU for redundancy and watchdog function
S12P: 16-Bit Microcontroller Safety companion MCU, 16-bit MCU for redundancy and watchdog function
S08SG: 8-bit Small Package SG MCUs Watchdog MCU, up to 32KB Flash
S08SL: 8-bit EEPROM with LIN S08EL and S08SL MCUs Watchdog MCU, up to 16KB Flash
Power Supply, SBC and Physical Interface
MC33907: Safe System Basis Chip DC/DC up to 800 mA on Vcore Safe System Basis Chip with Buck and Boost DC/DC up to 800mA
MC33908: Safe SBC with Buck and Boost DC/DC up to 1.5 A on Vcore Safe System Basis Chip with Buck and Boost DC/DC up to 1.5A
MC33742: SBC with Enhanced High-Speed CAN Transceiver System Basis Chip with CAN I/F
MC33903: System Basis Chip Gen2 with High-speed CAN and LIN System Basis Chip Gen2 with HS CAN and LIN I/F
MC33904: System Basis Chip Gen2 with High Speed CAN System Basis Chip Gen2 with HS CAN I/F
MC33905: System Basis Chip Gen2 with High-speed CAN and LIN System Basis Chip with CAN and LIN I/F
MOSFET Pre-Driver
MC33937: Three Phase Field Effect Transistor Pre-driver 3-Phase MOSFET Pre-Driver IC
Signal Conditioning
MC33972: MSDI with Suppressed Wakeup Multiple Switch Detection IC
MC33975: MSDI with 32 mA Suppressed Wakeup Signal Conditioning and Switch Monitoring
Advantages
  • Qorivva 32-bit MCU families specifically designed for advanced motor control allow for fast and precise acquisition of state variables and for real-time control code processing
  • Set of powerful motor control peripherals for use in advanced motor control applications
  • Cross-triggering unit allows automatic generation of ADC conversion requests during PWM period without CPU load and dynamic configuration optimization via DMA
  • The Qorivva dual-core MPC564xL supports reduced system complexity while providing key safety measures for enhanced safety
  • The Qorivva dual-core MPC574xP and MPC564xL microcontrollers support reduced system complexity while providing key safety measures for enhanced safety
  • The MC33906, MC33907 and MC33908 are pin-to-pin compatible SBCs offering power scalable DC/DC and LDO regulators combined with low power modes
  • The Qorivva MPC574xP, MPC564xL and MPC560xP microcontrollers are SafeAssure functional safety solutions
  • The MC33906, MC33907 and MC33908 feature an integrated safety architecture with voltage monitoring and fail safe state machine and are SafeAssure functional safety solutions
  • Freescale product longevity program offers up to 15-year availability for selected product

Functional Safety

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