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The return spring force ensured that the throttle returned to zero if the pedal force applied by the driver was reduced or removed. With electronic accelerator pedals, there was little inherent friction because of the simplicity of the mechanical design.
If the engine starts to slow down relative to the desired speed, the current will be increased, the motor will develop more torque, pulling against the return spring and opening the throttle. Should the engine run too fast, the governor will reduce the current being applied to the motor, causing the return spring to pull back and close the ...
In traditional spring-valve actuation, as engine speed increases, the inertia of the valve will eventually overcome the spring's ability to close it completely before the piston reaches top dead centre (TDC). This can lead to several problems. First, the valve does not completely return to its seat before combustion begins.
A spring applies force to close the door, which the dashpot offsets by forcing fluid to flow through an orifice, often adjustable, between reservoirs, which slows the motion of the door. Consumer electronics often use dashpots where it is undesirable for a media access door or control panel to suddenly pop open when the door latch is released ...
In fuel injected engines, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver accelerator pedal input in the main. The throttle body is usually located between the air filter box and the intake manifold, and it is usually attached to, or near, the mass airflow sensor.
All of these controls pull on a spring-loaded cable and are held in place with a ratcheting mechanism until released. In the 2000s, direct-acting electronic parking brakes controlled by a switch (as in the Volkswagen eGolf [ 3 ] ) are becoming more common, replacing cable-actuated mechanical systems.
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