# US 9,752,484 B2 · Method for operating a device for the dosed supply of a liquid

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- Number: US 9,752,484 B2
- Document ID: US9752484B2
- Status: Granted
- Kind: B2
- Application number: 14/786,320
- Filed: 2014-04-16
- Published: 2016-03-10
- Granted: 2017-09-05
- Earliest claimed: 2013-04-26
- Assignees: Continental Automotive GmbH
- Applicants: Continental Automotive GmbH
- Inventors: Rolf Brück; Jan Hodgson
- Web page: https://patentgrep.com/patent/US9752484B2

## CPC

- F01N 3/28: Construction of catalytic reactors
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00)
- F04C 5/00: Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable (such pumps specially adapted for elastic fluids F04C18/00)
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/1433: Pumps
- F01N 2610/144: Control thereof
- F04C 2/22: of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method for operating a device for the dosed supply of a liquid includes: detecting a demanded dose amount of the liquid; activating an electric drive of a pump to move a seal in a delivery direction from an inlet to an outlet to deliver the liquid by application of an operating voltage to the electric drive; stopping operation of the pump when the delivered amount of the liquid corresponds to the demanded dose amount; stopping movement of an eccentric; and maintaining a holding voltage at the electric drive. In response to the holding voltage, a holding torque is exerted on the eccentric and a movement of the eccentric counter to the delivery direction is prevented.

## Claims

### Claim 1

A method for operating a device (1) having: at least one pump (2) configured to deliver a liquid, the at least one pump (2) having a pump housing (3) having at least one inlet (4) and at least one outlet (5); an eccentric (6) arranged on the pump housing (3) so as to be rotatable relative to the pump housing (3); and a deformable diaphragm (7) arranged between the eccentric (6) and the pump housing (3), the deformable diaphragm (7) and the pump housing (3) delimiting a delivery path (8) from the at least one inlet (4) to the at least one outlet (5) and forming at least one seal (9) of the delivery path (8), the at least one seal (9) being displaceable along the delivery path (8) by a movement of the eccentric (6) to deliver the liquid, the at least one pump (2) having an electric drive (26) configured to move the eccentric (6), the method comprising:
detecting a demanded dose amount of the liquid;
activating the electric drive (26) of the at least one pump (2) to move the at least one seal (9) in a delivery direction (27) from the inlet (4) to the outlet (5) to deliver the liquid by application of an operating voltage (10) to the electric drive (26);
stopping operation of the at least one pump (2) when the delivered amount of the liquid corresponds to the demanded dose amount;
stopping movement of the eccentric (6); and
maintaining a holding voltage (35) at the electric drive (26), wherein, in response to the holding voltage (25), a holding torque (38) is exerted on the eccentric (6) and a movement of the eccentric (6) counter to the delivery direction (27) is prevented.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein a friction torque (13) assists the exerted holding torque (38).

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the holding voltage (35) is selected such that the holding torque (38) lies between a maximum torque and a minimum torque that can be exerted on the eccentric (6) by the liquid due to a pressure difference between the at least one outlet (5) and the at least one inlet (4).

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the electric drive (26) of the pump (2) has a power consumption of less than 15 watts when the holding voltage (35) is applied to the electric drive (26).

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the holding voltage (35) is generated by pulse width modulation (15).

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein a position (34) of the eccentric (6) relative to the pump housing (3) is detected before the maintaining, and a maximum possible torque that can be exerted on the eccentric (6) by the liquid is determined based on the position (34), and the holding voltage (35) is set based on the maximum possible torque.