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Instead, the position of the throttle valve (i.e., the amount of air in the engine) is fully controlled by the ETC software via the electric motor. But just opening or closing the throttle valve by sending a new signal to the electric motor is an open loop condition and leads to inaccurate control.
A Bowden cable (/ ˈ b oʊ d ən / BOH-dən) [1] is a type of flexible cable used to transmit mechanical force or energy by the movement of an inner cable relative to a hollow outer cable housing. The housing is generally of composite construction, consisting of an inner lining, a longitudinally incompressible layer such as a helical winding or ...
Therefore, the pilot has to pay attention to the RPM indicator and adjust the throttle/power lever in order to maintain the desired constant speed of the propeller. For example, when the airspeed reduces and the loading increases (e.g., in a climb), RPM will decrease and the pilot has to increase the throttle/power.
Historically, the throttle pedal or lever acts via a direct mechanical linkage. The butterfly valve of the throttle is operated by means of an arm piece, loaded by a spring. This arm is usually directly linked to the accelerator cable, and operates in accordance with the driver action.
Cockpit controls and instrument panel of a Cessna 182D Skylane. Generally, the primary cockpit flight controls are arranged as follows: [2] A control yoke (also known as a control column), centre stick or side-stick (the latter two also colloquially known as a control or joystick), governs the aircraft's roll and pitch by moving the ailerons (or activating wing warping on some very early ...
At take-off, the flight crew advances the power lever to a predetermined setting, or opts for an auto-throttle take-off if available. The FADECs now apply the calculated take-off thrust setting by sending an electronic signal to the engines; there is no direct linkage to open fuel flow. This procedure can be repeated for any other phase of flight.
Thrust levers of an A320 set to the autothrust position during cruise flight. An autothrottle (automatic throttle, also known as autothrust, A/T or A/THR) is a system that allows a pilot to control the power setting of an aircraft's engines by specifying a desired flight characteristic, rather than manually controlling the fuel flow.
For example, an extra "closed throttle position sensor" (CTPS) may be employed to indicate that the throttle is completely closed. Some engine control units (ECUs) also control the throttle position by electronic throttle control (ETC) or " drive by wire " systems, and if that is done, the position sensor is used in a feedback loop to enable ...