US 12,071,944 B2
Method and apparatus for vibration compensation in a piston compressor
Thomas Merkel, Hürth (DE); Michael Hartl, Unterhaching (DE); and Stefan Schneider, Munich (DE)
Assigned to KNORR-BREMSE SYSTEME FÜR SCHIENENFAHRZEUGE GMBH, (DE)
Appl. No. 16/310,703
Filed by KNORR-BREMSE SYSTEME FÜR SCHIENENFAHRZEUGE GMBH, Munich (DE)
PCT Filed Jun. 7, 2017, PCT No. PCT/EP2017/063769
§ 371(c)(1), (2) Date Dec. 17, 2018,
PCT Pub. No. WO2017/215991, PCT Pub. Date Dec. 21, 2017.
Claims priority of application No. 10 2016 111 101.5 (DE), filed on Jun. 17, 2016.
Prior Publication US 2019/0264676 A1, Aug. 29, 2019
Int. Cl. F04B 49/06 (2006.01); F04B 35/04 (2006.01); F04B 39/00 (2006.01); F04B 49/20 (2006.01); F04B 53/00 (2006.01)
CPC F04B 49/06 (2013.01) [F04B 35/04 (2013.01); F04B 39/0027 (2013.01); F04B 49/20 (2013.01); F04B 53/001 (2013.01); F04B 2201/02 (2013.01); F04B 2201/1202 (2013.01); F04B 2203/0207 (2013.01)] 6 Claims
OG exemplary drawing
 
6. A piston compressor for producing compressed air for a vehicle, the compressor comprising:
a piston compressor which is driven by a crankshaft by a three-phase motor controlled by a frequency converter; and
an apparatus for vibration compensation in the piston compressor, the apparatus comprising a control unit that determines the current position of the crankshaft of the piston compressor,
wherein, based on this, the frequency converter prescribes a torque (MM) that corresponds to the load moment (ML) of the piston compressor for the three-phase motor to reduce vibration excitation of the piston-type compressor as a whole,
wherein the torque (MM) prescribed for the three-phase motor corresponds to the first order of a load moment profile of the piston compressor,
wherein, to compensate for fluctuations in speed, the torque (MM) generated by the three-phase motor is produced by the frequency converter with an increased pulse width for a period of time, and
wherein, to compensate for fluctuations in speed, a torque requirement to be adjusted according to rotational speed is stored in logic of a control unit implemented by the frequency converter,
wherein the current angular position of the crankshaft of the piston compressor is determined by sensors and prescribed to the control unit by the sensors as a current crankshaft position, and
wherein a deviation of the load moment (ML) of the piston compressor is set to only approximately follow the torque (MM) for the three-phase motor, wherein the deviation is selected from a range of less than 30% and vibration behavior is improved by the vibration compensation by up to 70%.