Inventor · disambiguated record
Pengfei Ma
Also filed as: MA PENGFEI
54 granted patents·21 pending applications·491 citations·filing 2003–2024
98Inventor score
Top patents by PatentIndex Score
75 records- 0197US7908852B2Control system for recovering swing motor kinetic energyCATERPILLAR INC·Filed 2008·Granted Mar 22, 2011·57 cites·19 claims
- 0296US9945396B2Fluid systems for machines with integrated energy recovery circuitCATERPILLAR INC·Filed 2016·Granted Apr 17, 2018·10 cites·20 claims
- 0396US9829014B2Hydraulic system including independent metering valve with flowsharingCATERPILLAR INC·Filed 2015·Granted Nov 28, 2017·17 cites·20 claims
- 0496US9279236B2Electro-hydraulic system for recovering and reusing potential energyZHANG JIAO·Filed 2012·Granted Mar 8, 2016·26 cites·18 claims
- 0596US7269944B2Hydraulic system for recovering potential energyCATERPILLAR MITSUBISHI LTD·Filed 2005·Granted Sep 18, 2007·52 cites·22 claims
- 0695US8850806B2Hydraulic control system having swing motor energy recoveryZHANG JIAO·Filed 2011·Granted Oct 7, 2014·19 cites·35 claims
- 0793US9086061B2Energy recovery hydraulic systemCATERPILLAR INC·Filed 2012·Granted Jul 21, 2015·14 cites·20 claims
- 0892US10337532B2Split spool valveCATERPILLAR INC·Filed 2016·Granted Jul 2, 2019·7 cites·20 claims
- 0991US9618014B2Implement system having hydraulic start assistCATERPILLAR INC·Filed 2014·Granted Apr 11, 2017·12 cites·20 claims
- 1091US9290912B2Energy recovery system having integrated boom/swing circuitsCATERPILLAR INC·Filed 2012·Granted Mar 22, 2016·15 cites·19 claims
- 1191US7251935B2Independent metering valve control system and methodCATERPILLAR MITSUBISHI LTD·Filed 2005·Granted Aug 7, 2007·20 cites·22 claims
- 1290US11430319B1Cavitation detection systemCATERPILLAR INC·Filed 2021·Granted Aug 30, 2022·4 cites·20 claims
- 1390US9556591B2Hydraulic system recovering swing kinetic and boom potential energyCATERPILLAR INC·Filed 2015·Granted Jan 31, 2017·5 cites·20 claims
- 1489US9809958B2Engine assist by recovering swing kinetic energyCATERPILLAR INC·Filed 2015·Granted Nov 7, 2017·7 cites·20 claims
- 1589US7194856B2Hydraulic system having IMV ride control configurationCATERPILLAR MITSUBISHI LTD·Filed 2005·Granted Mar 27, 2007·19 cites·30 claims
- 1688US9951795B2Integration of swing energy recovery and engine anti-idling systemsCATERPILLAR INC·Filed 2015·Granted Apr 24, 2018·5 cites·18 claims
- 1788US8776511B2Energy recovery system having accumulator and variable reliefZHANG JIAO·Filed 2011·Granted Jul 15, 2014·13 cites·25 claims
- 1887US9091286B2Hydraulic control system having electronic flow limitingCATERPILLAR INC·Filed 2012·Granted Jul 28, 2015·7 cites·20 claims
- 1985US9290911B2Energy recovery system for hydraulic machineCATERPILLAR INC·Filed 2013·Granted Mar 22, 2016·6 cites·18 claims
- 2084US7204185B2Hydraulic system having a pressure compensatorCATERPILLAR MITSUBISHI LTD·Filed 2005·Granted Apr 17, 2007·16 cites·41 claims
- 2183US7958970B2Acceleration sensor calibrated hoist positioningEMPIRE TECHNOLOGY DEV LLC·Filed 2009·Granted Jun 14, 2011·16 cites·20 claims
- 2282US9068575B2Hydraulic control system having swing motor energy recoveryZHANG JIAO·Filed 2011·Granted Jun 30, 2015·5 cites·27 claims
- 2381US8919113B2Hydraulic control system having energy recovery kitMA PENGFEI·Filed 2011·Granted Dec 30, 2014·5 cites·13 claims
- 2480US7735517B2Rotary-actuated electro-hydraulic valveCATERPILLAR INC·Filed 2006·Granted Jun 15, 2010·17 cites·17 claims
- 2579US9261118B2Boom cylinder dig flow regenerationCATERPILLAR INC·Filed 2014·Granted Feb 16, 2016·4 cites·20 claims
- 2678US10385892B2System and method for providing hydraulic powerCATERPILLAR GLOBAL MINING LLC·Filed 2016·Granted Aug 20, 2019·3 cites·18 claims
- 2777US12428815B1Swing pump controlsPROGRESS RAIL LOCOMOTIVE INC·Filed 2024·Granted Sep 30, 2025·0 cites·19 claims
- 2876US12286986B2Method for monitoring operation of a hydraulic systemCATERPILLAR INC·Filed 2023·Granted Apr 29, 2025·0 cites·13 claims
- 2976US8424836B2Bidirectional force feedback poppet valveMA PENGFEI·Filed 2006·Granted Apr 23, 2013·10 cites·25 claims
- 3076US7121189B2Electronically and hydraulically-actuated drain valueCATERPILLAR MITSUBISHI LTD·Filed 2004·Granted Oct 17, 2006·22 cites·34 claims
- 3175US9745940B2Machine having hydraulic start assist systemCATERPILLAR INC·Filed 2014·Granted Aug 29, 2017·5 cites·19 claims
- 3274US7302797B2Hydraulic system having a post-pressure compensatorCATERPILLAR INC·Filed 2005·Granted Dec 4, 2007·7 cites·35 claims
- 3373US9458604B2Hybrid apparatus and method for hydraulic systemsCATERPILLAR INC·Filed 2014·Granted Oct 4, 2016·5 cites·17 claims
- 3472US11719265B2Cooler bypass valve assembly for hydraulic system return circuitCATERPILLAR INC·Filed 2021·Granted Aug 8, 2023·1 cites·17 claims
- 3572US7905089B2Actuator control system implementing adaptive flow controlCATERPILLAR INC·Filed 2007·Granted Mar 15, 2011·6 cites·18 claims
- 3671US9139982B2Hydraulic control system having swing energy recoveryMA PENGFEI·Filed 2011·Granted Sep 22, 2015·3 cites·11 claims
- 3771US7059126B2System for preventing swing wag for a work machine with a boom assemblyCATERPILLAR INC·Filed 2003·Granted Jun 13, 2006·21 cites·17 claims
- 3869US12467549B2Pump control shock absorberCATERPILLAR GLOBAL MINING LLC·Filed 2023·Granted Nov 11, 2025·0 cites·13 claims
- 3969US8833143B2Hydraulic accumulator pre-charge pressure detectionCHEN DAYAO·Filed 2012·Granted Sep 16, 2014·3 cites·20 claims
- 4069US7204084B2Hydraulic system having a pressure compensatorCATERPILLAR MITSUBISHI LTD·Filed 2004·Granted Apr 17, 2007·11 cites·31 claims
- 4167US9388829B2Hydraulic control system having swing motor energy recoveryCATERPILLAR INC·Filed 2012·Granted Jul 12, 2016·2 cites·18 claims
- 4262US8479504B2Hydraulic system having an external pressure compensatorKERCKHOVE PHILIPPE VANDE·Filed 2009·Granted Jul 9, 2013·5 cites·20 claims
- 4361US12188775B2Method and apparatus for recognizing special road condition, electronic device, and storage mediumHUAWEI TECH CO LTD·Filed 2022·Granted Jan 7, 2025·0 cites·30 claims
- 4461US9328744B2Hydraulic control system having swing energy recoveryCATERPILLAR INC·Filed 2012·Granted May 3, 2016·1 cites·20 claims
- 4561US7243493B2Valve gradually communicating a pressure signalCATERPILLAR MITSUBISHI LTD·Filed 2005·Granted Jul 17, 2007·4 cites·24 claims
- 4659US9366269B2Hydraulic accumulator health diagnosisCHEN DAYAO·Filed 2012·Granted Jun 14, 2016·1 cites·19 claims
- 4754USD1056744SFlow sensorGUANGZHOU AOSONG ELECTRONIC CO LTD·Filed 2022·Granted Jan 7, 2025·3 cites·1 claims
- 4854US2015101164A1Hydraulic control system having energy recovery kitCATERPILLAR INC·Filed 2014·Application pending·0 cites
- 4953US9897120B2Hydraulic system having energy recoveryCATERPILLAR INC·Filed 2015·Granted Feb 20, 2018·0 cites·19 claims
- 5052US2015000756A1Hydraulic accumulator pre-charge pressure detectionCATERPILLAR INC·Filed 2014·Application pending·0 cites
Showing the top 50 of 75 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →