Patent ID: 6158405
Filing Date: 2000-12-12
Classification: B60K,B60L,B60W,F02B,F02D,F02N,F16F,F16H,Y02T,Y10S

Abstract:
System for active dampening of rotational nonuniformities of a crankshaft (10) of an internal combustion engine (1) or a shaft coupled to it, withan electric rotary-field machine (4), which applies alternating torques to the crankshaft (10) or the shaft, so that it counteracts positive and negative rotational nonuniformities,at least one invertor (17), which generate at least one electrical characteristic including voltages and currents, the electrical characteristic having at least one variable including frequency, amplitude and phase required for the magnetic fields of the electric machine (4) by sine-evaluated pulse modulation with a clock frequency greater than 10 kHz;wherein the invertor (17) has an intermediate circuit with higher voltage level than an on-board network;and wherein the invertor (17) is outfitted in the intermediate circuit with an energy accumulator (19, 24) for buffering of energy accruing during the active dampening;wherein both the removal of energy from the intermediate circuit during motor operation of the electric machine (4) and the feeding of energy into the intermediate circuit in generator mode each occur at the elevated voltage level.