英飞凌助力转向系统解决方案
INTRODUCTIONConcerning Power Steering one differentiates between Electro Hydraulic Power Steering (EHPS) - that uses conventional hydraulic power steering with an electric motor driven hydraulic pump, Electric Power Steering (EPS) - where the E-motor is attached directly to the steering gearbox with no hydraulic system, and the Electro Parking Aid (EPA) - based on EPS but only active at low speed.
With electronic systems becoming more and more important in cars, EPS is the future. Unlike its conventional counterpart, EPS is active only during the actual steering process. It also makes steering hydraulics obsolete, cuts fuel consumption by as much as 0.4l/100km, and is fast to install, making it a winning technology for manufacturers, motorists, and the environment.
COMPONENTS
One possible configuration for an EPS solution is Infineon''s C164 high performance 16-bit microcontroller with up to 64 KBytes of program memory, 4 KBytes of RAM, and a comprehensive peripheral set including 10-bit ADC, USART, SPI, dedicated timer unit, FullCAN in combination with TLE 6280 GP, and Power MOSFET as shown below.
The TLE 6280 GP is a three-phase bridge driver device that simplifies the control of the power steering motor. The dedicated timer structure of the microcontroller reduces development costs and simplifies board design.
The Power MOSFETs have an ultra low on-resistance whereas the OptiMOS technology allows the combination of such devices into TO 220 package. Their rugged design makes them ideal for automotive applications.
SCHEMATIC BLOCK DIAGRAM:
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