Drive By Wire Technology in Cars

What is Drive By Wire Technology in cars and How it works? Know More.


What is Drive By Wire Technology?

Drive by Wire or simply 'DbW' is also known as the X-by-Wire. It is a semi-automatic, computer controlled technology mainly used in cars. It is quite similar to Ride by wire technology used in bikes. DbW controls the vehicular systems such as the acceleration, handling, braking, steering and other functions of a motor vehicle. It does so sans any physical/mechanical linkage.

Drive by wire / Throttle-by-Wire system
Drive by wire / Throttle-by-Wire system

A conventional vehicle carries out these functions by either using mechanical, hydraulic or pneumatic components as the case may be. These components are prone to wear-and-tear. Hence, their performance & efficiency deteriorates over the period. And thus, they become inefficient.



How Drive-by-wire works?

Drive by wire technology mainly uses electrical/electronic components such as sensors and/or actuators to control vehicular systems. This technology eliminates the need to use conventional components such as drive-belts, drive-shafts, pumps, vacuum boosters and master cylinders etc. Instead, it uses electric motors and electro-mechanical actuators to execute the functions carried out by the conventional mechanical/hydraulic components.

Which Drive by wire systems a vehicle uses?

Drive by Wire technology is divided into the following sub-systems which operate these systems:



  1. Throttle-by-Wire - Controls function of throttle
  2. Brake-by-Wire: Controls braking system
  3. Steer-by-Wire: Controls steering system
  4. Shift-by-Wire: Controls transmission system
  5. Park-by-Wire: Controls Parking Brake
Drive by wire / Steer-by-Wire system
Drive by wire / Steer-by-Wire system

Moreover, these sub-systems have a dedicated ECU to control the sensors and actuators associated with them. The respective systems operate without any mechanical linkage. As a result, this technology is getting popular. Thus, it finds a place in the luxury segment or high-end vehicle models.

Advantages of Drive by Wire technology:

  1. Reduces weight.
  2. Increases the operational accuracy.
  3. Eliminates losses caused by mechanical linkages.
  4. Longer service intervals, i.e. decrease in visits for routine maintenance and other adjustments.
  5. Maintenance free operation.
  6. Better accuracy. And hence, results in better fuel efficiency & lower emissions.

Disadvantages of Drive by Wire:

  1. Drive by wire system are costly to design and manufacture.
  2. Software failure may lead to malfunctioning of these systems.
  3. Error in calculation of required data may lead to an accident.
  4. Prone to hacking which may jeopardize the control of the vehicle.

Many car manufacturers such as Mercedes-Benz, BMW, Land Rover, GM, Toyota, Volkswagen, and Nissan have implemented 'X by Wire' systems in their vehicles. However, this technology is still in development stage. And thus, it requires rigorous testing and validation. But, the future of automobile will rely heavily on this technology for better fuel efficiency and control emissions.

Watch the 'Steer by Wire' by Nissan in action here:

About CarBike Tech

CarBikeTech is a technical blog with experience of over 20 years in the automobile field. It regularly publishes specific technical articles on automotive technology.

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