Sensorless control device for DC fuel pump

Patent metadata

Field	Value
Publication number	US-11326544-B2
Application number	US-202017103147-A
Country	US
Kind code	B2
Filing date	Nov 24, 2020
Priority date	Jul 13, 2020
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Provided is a sensorless control device for a DC fuel pump that may be downsized as compared to a conventional control device for a DC fuel pump and may implement the same operation at a relatively low cost, and the sensorless control device for a DC fuel pump.

First claim

What is claimed is:

1. A sensorless control device for a DC fuel pump, the sensorless control device comprising:
a measuring unit for measuring an input voltage of a power terminal of a DC motor included in the DC fuel pump;
a first removing unit for outputting a first voltage from which a DC component included in the input voltage measured by the measuring unit is removed;
a second removing unit for removing a switching component from the first voltage and amplifying a signal from which the switching component is removed to output a second voltage;
a delay unit for outputting a delay signal obtained by delaying the second voltage by a predetermined degree;
a square wave generation unit for generating a square wave by comparing the second voltage and the delay signal; and
a calculation unit for calculating revolutions per minute (RPM) of the DC motor by counting a cycle of the square wave.

2. The sensorless control device for a DC fuel pump of claim 1 , further comprising a control unit that compares the RPM of the motor calculated by the calculation unit with a target RPM, controls switches connected to the motor, and controls the RPM of the motor to the target RPM.

3. The sensorless control device for a DC fuel pump of claim 1 , wherein the second removing unit includes a band pass filter or a high pass filter.

4. The sensorless control device for a DC fuel pump of claim 3 , wherein the second removing unit further includes an amplifier disposed at a rear end of the band pass filter or the high pass filter to amplify and output an input signal.

5. The sensorless control device for a DC fuel pump of claim 1 , wherein the delay unit includes a comparator.

Assignees

• Coavis

Inventors

• Jang Young Sub
• Yun Suk Min

Classifications

• F02M37/08

  electrically driven · CPC title

• F02D41/1401

  characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence) · CPC title

• F02D2041/2075

  Type of transistors or particular use thereof · CPC title

• H02P6/18 Primary

  without separate position detecting elements · CPC title

• H02P7/0094

  wherein the position is detected using the ripple of the current caused by the commutator · CPC title