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  2. Automatic transmission - Wikipedia

    en.wikipedia.org/wiki/Automatic_transmission

    The first six-speed automatic was the ZF 6HP26 transmission, which debuted in the 2002 BMW 7 Series (E65). The first seven-speed automatic was the Mercedes-Benz 7G-Tronic transmission, which debuted a year later. In 2007, the first eight-speed transmission to reach production was the Toyota AA80E transmission.

  3. Transmission control unit - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Unit

    A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.

  4. Wheel speed sensor - Wikipedia

    en.wikipedia.org/wiki/Wheel_speed_sensor

    The most common wheel speed sensor system consists of a ferromagnetic toothed reluctor ring (tone wheel) and a sensor (which can be passive or active). The tone wheel is typically made of steel and may be an open-air design, or sealed (as in the case of unitized bearing assemblies). The number of teeth is chosen as a trade-off between low-speed ...

  5. Traction control system - Wikipedia

    en.wikipedia.org/wiki/Traction_control_system

    A traction control system (TCS), is typically (but not necessarily) a secondary function of the electronic stability control (ESC) on production motor vehicles, designed to prevent loss of traction (i.e., wheelspin) of the driven road wheels. TCS is activated when throttle input and engine power and torque transfer are mismatched to the road ...

  6. Parking pawl - Wikipedia

    en.wikipedia.org/wiki/Parking_pawl

    t. e. A parking pawl is a device fitted to a motor vehicle 's automatic transmission that locks up the transmission when the transmission shift lever selector is placed in the P ark position. "Park" is the first position of the lever (topmost on a column shift, frontmost on a floor shift) in all cars sold in the United States since 1965 (when ...

  7. Speedometer - Wikipedia

    en.wikipedia.org/wiki/Speedometer

    A digital, LCD speedometer in a Honda Insight. A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards. [ 1 ]