السلام عليكم و رحمه الله و بركاتوا
الى اخوتى فىالمنتدى سنبدأ اليوم فى سلسلة تكنولوجيا السيارات و ادعوا الله ان يحوز الموضو ع على اعجابكم
فى البداية اعرفكم بنفسى انا مهندسة سيارات اعمل باكاديمية تدريب معتمدة من المانية(a-part)( bocsh ) فى القاهرة.
Cylinder-charge control systems
[LEFT][B]Conventional systems [/B]
[B]Conventional layouts rely on mechanical linkage to control the throttle valve. A [/B]
[B]Bowden cable or linkage rod(s) translate accelerator-pedal travel into throttle- valve motion. [/B]
To compensate for the cold engine's higher levels of internal friction, a larger air mass is required and supplementary fuel must be injected. Increased air flow is also required to balance drive-power losses when ancillaries such as air-conditioning compressors are switched on. This additional air requirement can be met by an air-bypass actuator, which controls a supplementary air stream routed around the throttle valve. [/LEFT]
Systems with ETC
In contrast, ETC (electronic throttle control) employs an ECU to control throttle-valve travel. The throttle valve forms a single unit along with the throttle- valve actuator (DC motor) and the throttle-valve angle sensor: This is the :sm5: ).
Two mutually-opposed potentiometers monitor accelerator-pedal travel as the basis for controlling this type of throttle valve assembly. The ECU calculates the throttle-valve aperture that corresponds to the driver's demand, makes any adjustments needed for adaptation to the engine's current operating conditions, and then generates a corresponding trigger signal for transmission to the throttle-valve actuator. The throttle-valve travel sensor with its two mutually- opposed potentiometers permits precise and accurate response to :sm5:positioning commands.