Embedded Systems In Automobiles

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Fig. 11: Cruise control


Fig. 12: Working of a cruise control system

Drive by wire.

Drive by wire system replaces mechanical connections like push rods, rack and pinion, steering columns, overhead cams and cables by mechatronic connections like sensors, actuators, embedded microprocessors and control software.

Fig. 13: Drive by wire concept carFig. 1: An automobile with embedded systems

Throttle by wire.

This system helps accomplish vehicle propulsion by means of an electric throttle without any cables from the accelerator pedal to the throttle valve at the engine. It controls electric motors by sensing accelerator pedal input and sending commands to power inverter modules.

Brake by wire.

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A pure brake by wire system eliminates the need for hydraulics completely by using motors to actuate calipers and lock the wheels in comparison to the current technology where the system is designed to provide braking effort by building hydraulic pressure in brake lines.

Shift by wire.

Direction of motion of the vehicle (forward or reverse) is set by commanding the actuators inside the transmission through electronic commands based on current input from the driver (park, reverse, neutral or drive).

Steer by wire.

This system provides steering control of a car with fewer mechanical components/linkages between the steering wheel and the wheels. Control of the wheels’ direction is established through electric motor(s), which are actuated by electronic control units monitoring steering wheel inputs from the driver.

Akul Sabharwal is an electronics and communication engineer. He is currently working as R&D head at Sammi Electronics India Pvt Ltd



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