Arrangement and method for detecting an electrical line interruption during operation of a drive system

Patent metadata

Field	Value
Publication number	US-10670658-B2
Application number	US-201615767408-A
Country	US
Kind code	B2
Filing date	Sep 21, 2016
Priority date	Oct 15, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The invention relates to an arrangement for identifying an electrical line interruption during operation of a drive system (20), which comprises two parallel-connected DC motors (21, 41), which are mechanically coupled to one another by means of a part that is to be driven, a driver for driving the two parallel-connected DC motors (21, 41) and a measuring device for detecting different electrical variables of the drive system (20). The measuring device comprises a rotational speed determination apparatus (32) for determining the rotational speed of the two DC motors (21, 41) and for supplying a piece of rotational speed information representing the rotational speed. The measuring device further comprises a current measuring apparatus (27; 28) for determining a summation current flowing in the two DC motors (21, 41) and for supplying a piece of current information representing the summation current and a voltage determination apparatus (60; 61) for determining the terminal voltage of the two DC motors (21, 41) and for supplying a piece of voltage information representing the terminal voltage. A computation unit (70) is designed to ascertain a motor parameter (kω) for the drive system (20) from the voltage information, the current information and the rotational speed information and to compare said motor parameter with a setpoint value (kω_set) of the motor parameter (kω), wherein the presence of a line interruption to one of the two DC motors (21, 41) can be inferred from the result of the comparison.

First claim

The invention claimed is:

1. An arrangement for identifying an electrical line interruption during operation of a drive system, comprising:
two parallel-connected DC motors, which are mechanically coupled to one another by a part that is to be driven;
a driver for driving the two parallel-connected DC motors; and
a measuring device for detecting different electrical variables of the drive system;
the measuring device comprising:
a rotational speed determination apparatus for determining rotational speed of the two DC motors, wherein the rotational speed determination apparatus is configured to supply a piece of rotational speed information representing the rotational speed to a computation unit;
a current measuring apparatus for determining a summation current flowing into the two DC motors, wherein the current measuring apparatus is configured to supply a piece of current information representing the summation current to the computation unit; and
a voltage determination apparatus configured to determine terminal voltage of the two DC motors, wherein the voltage determination apparatus is configured to supply a piece of voltage information representing the terminal voltage to the computation unit;

the computation unit is configured to ascertain a motor parameter k ω for the drive system from the voltage information, the current information and the rotational speed information and to compare said motor parameter with a setpoint value k ω_set of the motor parameter k ω , wherein presence of the electrical line interruption to one of the two DC motors can be inferred from a result of the comparing.

2. The arrangement as claimed in claim 1 , wherein the computation unit is configured to ascertain the motor parameter k ω according to formula

k
ω

=

U
KL

-

I
Sum

2

·

R
a

ω

wherein U KL is the terminal voltage, I Sum is the summation current, R a is armature resistance of the DC motors and ω is the rotational speed.

3. The arrangement as claimed in claim 1 , wherein the computation unit is configured to infer the presence of the electrical line interruption when the ascertained motor parameter k ω is lower than the setpoint value k ω_set of the motor parameter.

4. The arrangement as claimed in claim 1 , wherein the computation unit is configured to infer the presence of the operation of the drive system as intended when the ascertained motor parameter k ω corresponds to the setpoint value k ω_set of the motor parameter or is within a prescribed tolerance range around the setpoint value.

5. The arrangement as claimed in claim 1 , wherein the computation unit is configured to read out the setpoint value k ω_set of the motor parameter from a memory of the computation unit.

6. The arrangement as claimed in claim 1 , wherein the setpoint value k ω_set of the motor parameter is a fixed, unchanging value.

7. The arrangement as claimed in claim 1 , wherein the setpoint value k ω_set of the motor parameter is a value that is determined and adapted during operation of the drive system.

8. The arrangement as claimed in claim 1 , wherein the current measuring apparatus comprises a measuring shunt and a first voltage measuring means for detecting the voltage dropped across the measuring shunt, wherein the measuring shunt is interconnected between a first node, at which respective first terminals of the two parallel-connected DC motors are connected, and a first driver output.

9. The arrangement as claimed in claim 1 , wherein the voltage determination apparatus comprises a second voltage measuring means, which is coupled to a first node to detect a first voltage applied to the first node, and a third voltage measuring means, which is coupled to a second node to which respective second terminals of the two parallel-connected DC motors are connected to detect a second voltage applied to the second node, wherein the terminal voltage can be ascertained from the difference between the first and the second voltage.

10. The arrangement as claimed in claim 1 , wherein the rotational speed determination apparatus comprises a single sensor at a drive shaft of the two DC motors.

11. The arrangement as claimed in claim 1 , wherein the part that is to be driven is a hatch of a motor vehicle.

12. A method for identifying an electrical line interruption during operation of a drive system, which comprises:
two parallel-connected DC motors, which are mechanically coupled to one another by a part that is to be driven;
a driver for driving the two parallel-connected DC motors; and
a measuring device for detecting different electrical variables of the drive system;

the method comprising:
at a rotational speed determination apparatus of the measuring device determining a rotational speed of the two DC motors and supplying a piece of rotational speed information representing the rotational speed to a computation unit;
at a current measuring apparatus of the measuring device determining a summation current flowing into the two DC motors and supplying a piece of current information representing the summation current to the computation unit;
at a voltage determination apparatus of the measuring device determining terminal voltage of the two DC motors and supplying a piece of voltage information representing the terminal voltage to the computation unit; and
at the computation unit ascertaining a motor parameter k ω for the drive system from the voltage information, the current information and the rotational speed information and comparing said motor parameter with a setpoint value k ω_set of the motor parameter, wherein presence of the electrical line interruption to one of the two DC motors is inferred from the result of the comparing.

13. The method as claimed in claim 12 , wherein the computation unit ascertains the motor parameter k ω according to formula

k
ω

=

U
KL

-

I
Sum

2

·

R
a

ω

wherein U KL is the terminal voltage, I Sum is the summation current, R a is armature resistance of the DC motors and ω is the rotational speed.

14. The method as claimed in claim 12 , wherein the computation unit infers the presence of the electrical line interruption when the ascertained motor parameter k ω is lower than the setpoint value k ω_set of the motor parameter.

15. The method as cl

Assignees

• Conti Temic Microelectronic Gmbh

Inventors

• Kessler Erwin

Classifications

• H02P29/0241

  the fault being an overvoltage · CPC title

• H02P7/245

  whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value · CPC title

• H02P7/06

  for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current · CPC title

• H02P5/68

  controlling two or more DC dynamo-electric motors (H02P5/46, H02P5/60 take precedence) · CPC title

• G01R31/343 Primary

  in operation · CPC title