Brand New Gear box POWER STEERING RACK AND PINION for Honda CRV MK4 RM 12-, 53600T1G-E01
Safety must be the most important consideration facing any EPS designer. You can design the most cost-effective, highest-performance power-steering system on the market, but nobody will want it if it has a reputation for occasionally driving you off the road.
A common topology used to ensure reliability in safety-critical automotive systems is referred to as the asymmetrical architecture approach. With this technique, a control problem is solved using two different algorithms, running on two different architectures. If the results disagree, a fault condition is generated that places the system in a failsafe condition.
Another innovative technique to enhance EPS reliability has been developed by the Motorola Automotive Group, which produces about 750,000 EPS systems per year. Dr. Tony O'Gorman, a distinguished member of the technical staff at Motorola feels that safety must be integrated into a steering system throughout the design process, not just slapped on as an afterthought. Motorola has developed a patented technique on its MG3 EPS systems referred to as the Seed Vector Test, where control vectors are fed serially to a Freescale 8300 digital signal controller. In essence, the controller is given a set of mathematical and logical problems to solve in real-time; these problems are designed to test the hardware and software integrity of the device. If the seed vector results are incorrect, a fault is generated that disables all the transistors driving the motor. As a result, the motor can safely be brought off-line in less than 20ms. As an additional safety measure, the voltage vectors generated by the three-phase inverter are also checked to ensure that proper signals are being supplied to the motor at all times. During a fault condition, unwanted steer cannot result even if one or more of the inverter transistors is shorted, since the motor requires AC waveforms to operate. Under worst-case conditions, the motor may impede motion on the steering wheel, but this is not nearly as hazardous as the wheel suddenly veering off in an unwanted direction.
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