Hardware design of a motors control module in sensorless approach for memory seats application

n the last two decades, many applications of automotive are become varied to correspond driver and passengers comfort and ergonomy. Some applications are become standard specifiations not additional one. Therefore, the car manufacturers take in consideration based on requirements of humans, then automotives are designed and developed. Memory seats, power windows, lift gate and power trunk, side mirrors are some applications of automotive that are improved and constructed. These type of applications before are only controlled by mechanically and but also from some years on the electronic control is used and become popular for many car manufacturers. Especially, the vehicle seats have different movement capabilities and ergonomic calibrations and each seat is controlled by an individual motor, hence the configuration and comfort settings can be adjusted by driver and passenger thanks to position memory. The purpose of thesis is to implementing electronic design of memory seats control module to drive Brushed DC Motor in sensorless approach as a research project of Electronic Division of Bitron Industrie S.p.A. in Grugliasco(TO). This division is specialized in the design of electronic systems and devices for the automotive applications. The idea is to develope and design new sensorless approach model that can have same or similar capability as a sensored approach hence, the new model is an alternative for sensored one. The project is focused on hardware design that are comprised of circuit simulation, testing developed hardware, electrical schematics, characterization of seat motor. Existing model, sensored approach is used multiple magnetic sensors mounted on the body of the motor to cause a feedback loop to motor control module. In contrast to sensored solution, sensorless approach reduces the number of sensors and the number of wirings that are required and also it decreases the cost of labour to assembly of sensors. For these reason, the aim of sensorless solution is to get convinent results with a cheaper and easily configurable way. A sensorless method could be applied with Brushed DC Motor in order to benefit from back-electromagnetic force(BEMF) has on the current enters the motor. Position measurement is important and very precise for sensorless method of memory seats that’s why position of the motor is followed current ripples that are counted by comparator in sensorless method. By using simulation program and by acquiring experimental acquisitions, these kind of works are performed only focused on the developement of measuring accuracy. For simulation of the system on the computer, TINA(TI) program has been used and for experimental approaches all testing equipments and electronic components are providen by Bitron Industrie S.p.A.