Electronic Stability Control System
Traction by the road surface is often uneven between each wheel due to road surface friction, tire adhesion, steering application, braking application, powertrain torque application etc. When traction is uneven between wheels during dynamic operation, an undesired lateral or rotational movement (yaw) may occur. ESC is designed to control this movement. While ABS/TC control longitudinal motion (front-to back), ESC controls lateral motion (side-to-side). Compared to ABS systems, ESC Systems typically support additional sensors, actuators and communications networks in the vehicle.
Microcontroller – An automotive-grade ARM based microcontroller is used to compare speed sensor data, control brake cylinder pressure and control the return pump for each wheel brake cylinder. The MCU is also responsible for diagnostics, warning notification and communication with other on board control units. Newer automotive MCUs from TI can provide evidence of their suitability for use in systems where IEC61508 and ISO26262 safety standards compliance may be required.
The TMS570 is the perfect suitable microcontroller for this application. The TMS570 family is targeted at high performance transportation applications that require Automotive/AEC Q100 (Grade 1) qualification and negative 40 to 125C temperature operation. This family also features Ethernet, FlexRay, CAN, LIN, SPI, I2C and UART connectivity. It has been developed to both the ISO 26262 ASIL-D and IEC 61508 SIL-3 safety standards. The Cortex R4F in the TMS570 devices also provide over 280 DMIPs of performance with core clock rates up to 180MHz.
ABS /ESC IC – The TPIC7218 is an antilock brake controller designed for use in harsh automotive environments, requiring few external components. It has eight high current low-side drivers for use with solenoid valves, four configurable wheel speed sense inputs capable of handling both Intelligent and Active sensors, and high-side gate drivers for controlling two external N-channel MOSFETs for use with a pump motor and master relay.
Power Management – The TPS65381-Q1 is a multi-rail power supply designed to supply microcontrollers in safety-critical applications, such as those found in automotive. The devices supports Texas Instruments’ TMS570LS series 16/32-bit RISC flash MCU and other microcontrollers with dual-core lockstep (LS) or loosely coupled architectures (LC).
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