The invention is directed to a motor vehicle vacuum pump (10;10'), comprising a pumping unit (24) with a rotatable pump rotor (26), an electronically commutated electric motor (30) for driving the pump rotor (26), and a pump control unit (34;34') for controlling a variable rotational motor speed (MS) of the electric motor (30), the pump control unit (34;34') comprising - a speed profile storage (44) which stores an evacuation cycle speed profile (46) with at least one evacuation cycle speed value (SV), - an evacuation cycle control module (42) which is configured to control the variable rotational motor speed (MS) within an evacuation cycle according to the evacuation cycle speed profile (46), - a wear compensation control module (48;48') which is configured to regularly adapt the evacuation cycle speed profile (46) by irreversibly increasing at least one evacuation cycle speed value (SV) of the evacuation cycle speed profile (46) each adapting time to thereby gradually increase an average evacuation cycle speed with increasing total pump operation time (OT). The pump control unit (34;34') according to the present invention is configured to regularly adapt the evacuation cycle speed profile (46) for increasing the pump performance with increasing total pump operation time (OT). This allows to compensate a wear-caused pump efficiency decrease without the need of "oversizing" the pumping unit (24) and thus provides a reliable and cost-efficient motor vehicle vacuum pump (10; 10').
MOTOR VEHICLE VACUUM PUMP
KRAFTFAHRZEUG-VAKUUMPUMPE
POMPE À VIDE DE VÉHICULE AUTOMOBILE
2024-02-28
Patent
Electronic Resource
English