Stator for an electric motor having respective angled slots

• US 10,228,404 B2
• Filed: 10/28/2016
• Issued: 03/12/2019
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Neudecker, Rupert, Kerler, Dominik
• Primary Examiner(s): Nguyen, Hoai-An D.
• Application Number:
  US15/336,984
• Publication Number:
  US 20170045566A1
• Time in Patent Office: 865 Days
• Field of Search: 324500, 324503, 324512, 324522, 324600, 324649, 324691, 324713, 324715, 324718, 701 1, 701 316, 701 318, 701 319, 701 333, 702 1, 702 57, 702 64
• CPC Class Codes: G01R 19/0084 measuring voltage only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 19/16571 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current G01R19/16514, G01R19/16519, G01R19/16528, G01R19/16533, G01R19/1659 take precedence; measuring currents by using elements sensitive to the magnetic field generated G01R15/14; measuring earth resistance G01R27/18; testing for leakage or short circuits in electrical apparatus G01R31/52
• CPC Class Codes: G01R 31/007 using microprocessors or computers

Abstract

A method and a corresponding device are provided for recognizing a faulty quiescent current behavior of a vehicle, in particular for identifying a quiescent current threshold value for an electrical on-board network of a vehicle. The method includes the identifying of a plurality of quiescent current data sets of a corresponding plurality of vehicles. A quiescent current data set of a vehicle includes a quiescent current measured value of the vehicle and a value for one or a plurality of vehicle parameters of the vehicle. The method furthermore includes the identifying of a plurality of classes via cluster analysis of the plurality of quiescent current data sets. A class includes a vehicle group which is described by one or a plurality of values for one or a plurality of vehicle parameters, and a class-quiescent current for the vehicle group. The method determines a quiescent current threshold value based on at least one of the class-quiescent currents of the plurality of classes.

Claims

1. A method for determining a quiescent current threshold value for a vehicle electrical system of a vehicle, the method comprising the acts of:

determining a multiplicity of quiescent current data records of a corresponding multiplicity of vehicles, wherein a quiescent current data record of a vehicle comprises a quiescent current measured value of the vehicle and a value for one or more vehicle parameters of the vehicle;

determining a multiplicity of classes by cluster analysis of the multiplicity of quiescent current data records, wherein a class comprises a vehicle group, which is described by one or more values for one or more vehicle parameters, and comprises a class quiescent current for the vehicle group; and

determining a quiescent current threshold value based on at least one of the class quiescent currents of the multiplicity of classes.

2. The method as claimed in claim 1, wherein the one or more vehicle parameters of a vehicle:

describe one or more properties of the vehicle; and

/or

comprise information on one or more of;

a manufacturer of the vehicle, a type of the vehicle, a series of the vehicle, features of the vehicle, an ambient temperature of the vehicle, a humidity in surroundings of the vehicle or a region in which the vehicle is operated.

3. The method as claimed in claim 1, wherein the determining of the quiescent current threshold value comprises multiplication of a class quiescent current by a predefined factor.

4. The method as claimed in claim 1, wherein the cluster analysis takes into consideration one or more of the following conditions:

a predefined number of classes;

a predefined difference between the class quiescent currents of different classes.

5. The method as claimed in claim 1, wherein the quiescent current of a vehicle comprises a current that is needed for the operation of one or more electrical loads of the vehicle in an idle state of the vehicle.

6. A control unit for a vehicle, wherein the control unit is configured to:

receive a quiescent current threshold value determined in accordance with the method of claim 1;

capture an indicator for a quiescent current of a vehicle electrical system of the vehicle;

compare the indicator of the quiescent current with the quiescent current threshold value; and

identify the presence of a quiescent current error when the indicator of the quiescent current reaches or exceeds the quiescent current threshold value.

7. A method for identifying a quiescent current error in a vehicle electrical system of a first vehicle, the method comprising the acts of:

determining one or more first values of one or more vehicle parameters of the first vehicle;

providing a classifier having a multiplicity of classes, wherein a class comprises a vehicle group, which is described by one or more values of one or more vehicle parameters, and comprises a class quiescent current for the vehicle group;

determining a first vehicle group of the first vehicle on the basis of the classifier and on the basis of the one or more first values of the one or more vehicle parameters of the first vehicle;

determining a first quiescent current threshold value for the first vehicle on the basis of the class quiescent current of the first vehicle group; and

identifying a quiescent current error in the first vehicle on the basis of the first quiescent current threshold value.

8. The method as claimed in claim 7, wherein the identification of a quiescent current error comprises:

determining a present quiescent current of the first vehicle; and

comparing the present quiescent current with the first quiescent current threshold value.

9. The method as claimed in claim 7, wherein the method further comprises:

initiating a measure for correcting the quiescent current error when a quiescent current error has been identified.

10. The method as claimed in claim 8, wherein the method further comprises:

initiating a measure for correcting the quiescent current error when a quiescent current error has been identified.