Function of the injection system: - ra07116020010x(0010)
K. Intake manifold pressure compensator (ALDA) - Engine 602.96, 603.96/97 TURBO (Model 463.3: pay attention to variations)
K. Intake manifold pressure compensator (ALDA)
The intake manifold pressure compensator (ALDA device) comprises a housing (103) with barometer unit (103b). The absolute pressure can act on the barometer units by means of a port (103a) to the charge air pipe of the engine, and the barometer units thus react to every pressure change with a change of length. All movements are transmitted to the compound lever of the governor and to the control rod.
As the absolute pressure drops, the barometer units expand. The correction linkage (103c) of the units is pressed downwards and acts on the compound lever to move the control rod in the direction of "reduced quantity". As the absolute pressure rises, caused by a higher air and/or charge pressure, the movement is performed in the opposite direction - i.e. in the direction of "increased quantity". The effect of the ALDA device diminishes, the more the control lever is moved in the direction of idling. When the control lever is in the idling position, the effect is approximately zero.
Absolute pressure with charge operation
The intake air under atmospheric pressure is further compressed by the turbocharger. Atmospheric and charge pressure together produce the absolute pressure prevailing in the charge air pipe of the engine.