Method for operating a pump

Patent metadata

Field	Value
Publication number	US-10385849-B2
Application number	US-201515128630-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Mar 26, 2014
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A pump includes a pump housing, an inlet, an outlet, a rotatable eccentric, a deformable element between housing and eccentric and a delivery channel from inlet to outlet formed by the deformable element and the housing. The deformable element is pressed against the housing in sections by the eccentric forming a movable seal of the channel and a closed volume in the channel being movable along the channel from inlet to outlet to pump the liquid by rotating the eccentric. A method for operating the pump includes a) setting a liquid quantity to be pumped, b) determining a temperature of the deformable element, c) determining a parameter considering the temperature from step b), the parameter representing a dependence between movement of the eccentric and pump capacity and d) pumping the liquid quantity set in step a) by adapting an operating mode of the pump considering the parameter from step c).

First claim

The invention claimed is:

1. A method for operating a pump for conveying a liquid, the method comprising the following steps: providing at least one pump housing having at least one inlet and at least one outlet; placing an eccentric at the at least one pump housing, the eccentric being rotatable about an axis relative to the at least one pump housing; placing a deformable element between the at least one pump housing and the eccentric; the deformable element and the at least one pump housing forming a delivery channel from the at least one inlet to the at least one outlet; providing at least one temperature sensor for determining a temperature of said deformable element; providing opposing counter elements mounted on the at least one pump housing and abutting the deformable element, the counter elements sealing the deformable element on the at least one pump housing, one of the counter elements having a channel formed therein for the temperature sensor, the channel opening against the deformable element; the eccentric pressing the deformable element in sections against the at least one pump housing to form at least one displaceable seal of the delivery channel and at least one closed pump volume in the delivery channel; displacing the at least one displaceable seal and the at least one closed pump volume along the delivery channel from the at least one inlet to the at least one outlet by a rotational movement of the eccentric to deliver the liquid; a) setting a liquid quantity to be delivered by the pump; b) determining a temperature of the deformable element with the temperature sensor.

2. A pump for delivering a liquid, the pump comprising:
at least one pump housing having at least one inlet, at least one outlet and a cylindrical circumferential surface;
an eccentric disposed at said at least one pump housing, said eccentric being rotatable about an axis relative to said at least pump housing;
a deformable element disposed between said at least pump housing and said eccentric;
said deformable element and said cylindrical circumferential surface forming a delivery channel from said at least one inlet to said at least one outlet;
said deformable element being pressed by said eccentric in sections against said at least one pump housing to form at least one displaceable seal of said delivery channel and at least one closed pump volume in said delivery channel;
said at least one displaceable seal and said at least one closed pump volume being displaced by a rotational movement of said eccentric along said delivery channel from said at least one inlet to said at least one outlet to deliver the liquid; and
at least one temperature sensor for determining a temperature of said deformable element;
opposing counter elements mounted on said at least one pump housing and abutting said deformable element, said counter elements sealing said deformable element on said at least one pump housing, one of said counter elements having a channel formed therein for said temperature sensor, said channel opening against said deformable element.

3. The pump according to claim 2 , wherein said at least one temperature sensor is an infrared sensor for detecting thermal radiation emanating from said deformable element.

4. The pump according to claim 3 , wherein said channel is a radiation channel, the thermal radiation passing along said radiation channel from said deformable element to said infrared sensor.

5. The pump according to claim 2 , wherein said at least one temperature sensor is a thermocouple being in contact with said deformable element.

6. The pump according to claim 2 , wherein said at least one temperature sensor is a measuring resistor.

7. A motor vehicle, comprising:
an internal combustion engine;
an exhaust gas treatment apparatus for purifying exhaust gases of said internal combustion engine; and
a tank for storing a liquid additive for exhaust gas purification;
an injector for feeding the liquid additive to said exhaust gas treatment apparatus; and
a pump according to claim 2 for delivering the liquid additive from said tank to said injector.

Assignees

• Continental Automotive Gmbh

Inventors

• Hodgson Jan
• Kopp Yves
• Maguin Georges

Classifications

• F04B2201/0403

  Carter housing temperature · CPC title

• F04B49/06

  Control using electricity (regulating by means of floats actuating electric switches F04B49/04) · CPC title

• F04B2201/0801

  Temperature · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F04C2210/1083

  Urea · CPC title