# US 12,006,896 B2 · EGR pump system and control method of EGR pump

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- Number: US 12,006,896 B2
- Document ID: US12006896B2
- Status: Granted
- Kind: B2
- Application number: 18/320,777
- Filed: 2023-05-19
- Published: 2023-11-23
- Granted: 2024-06-11
- Earliest claimed: 2018-01-17
- Assignees: Eaton Intelligent Power Limited
- Applicants: Eaton Intelligent Power Limited
- Inventors: Douglas Anthony Hughes; Brandon Dennis Biller; Jim Kevin Spring; Jesse Drummond; Matthew Fortini
- Web page: https://patentgrep.com/patent/US12006896B2

## CPC

- F02M 26/49: Detecting, diagnosing or indicating an abnormal function of the EGR system
- F02B 33/34: with rotary pumps (with cell-type pressure exchangers or the like F02B33/42)
- F02B 33/38: of Roots type
- F02B 39/10: electric
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 41/0055: {Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus}
- F02D 41/006: {using internal EGR (control of valve overlap for internal EGR F02D13/0261; arrangements for internal EGR F02M26/01)}
- F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)}
- F02D 41/064: {at cold start (F02D41/067 takes precedence)}
- F02D 41/1446: {the characteristics being exhaust temperatures}
- F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
- F02M 26/33: controlling the temperature of the recirculated gases
- F02M 26/34: with compressors, turbines or the like in the recirculation passage
- F02M 26/50: Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities (arrangement or layout of EGR passages with means for cleaning or treating the recirculated gases F02M26/35; protection of EGR valves from damage F02M26/74)
- F04C 18/126: {with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type}
- F04C 28/06: specially adapted for stopping, starting, idling or no-load operation
- F04C 28/08: characterised by varying the rotational speed
- F04C 29/005: {Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions}
- F04C 29/04: Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00)
- F02D 2200/021: Engine temperature
- F02M 26/00: Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F04C 18/14: with toothed rotary pistons
- F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D)
- F04C 29/045: {of the electric motor in hermetic pumps}
- F04C 2240/30: Casings or housings
- F04C 2240/50: Bearings
- F04C 2240/81: Sensor, e.g. electronic sensor for control or monitoring
- F04C 2270/03: Torque
- F04C 2270/0525: Controlled or regulated
- F04C 2270/19: Temperature
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method of operating exhaust gas recirculation pump for an internal combustion engine including: providing an EGR pump assembly including an electric motor coupled to a roots device having rotors, the EGR pump operably connected to an internal combustion engine; providing an EGR control unit linked to the EGR pump assembly; providing sensors linked to the EGR control unit; determining if a motor speed is within a predetermined target in step S1 wherein when motor speed=predetermined target then; determining if a motor torque is within a predetermined target in step S2 wherein when motor torque=predetermined target then; determining if a motor temperature is within a predetermined target in step S3 wherein when motor temperature=predetermined target then; and maintaining operation of the exhaust gas recirculation pump.

## Claims

### Claim 1

A method of operating an exhaust gas recirculation (EGR) pump for an internal combustion engine comprising:
providing an EGR pump assembly including an electric motor coupled to a Roots device having rotors, the EGR pump assembly operably connected to an internal combustion engine;
providing an EGR control unit linked to the EGR pump assembly;
providing sensors linked to the EGR control unit;
performing an engine shut down and determining if an exhaust temperature is less than 5 degrees Celsius (C); and
moving the rotors when the exhaust temperature is determined to be less than 5 degrees C.

### Claim 2 (depends on 1)

The method of operating an exhaust gas recirculation pump of claim 1, wherein the step of moving the rotors includes alternatively moving the rotors clockwise and counterclockwise.