Method for establishing a functional diagnosis for a buck static dc-dc voltage converter

Patent metadata

Field	Value
Publication number	US-2016178708-A1
Application number	US-201514974336-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 22, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A method for establishing a functional diagnosis for a buck static DC-DC voltage converter in an electric or hybrid vehicle including a power supply circuit including at least a first and a second electrical voltage source supplying respectively a primary and a secondary circuit with direct current, the first source having a voltage value greater than the second source, the primary and secondary circuits being connected by the voltage converter which itself is commanded by control and safety elements, includes the following sequential steps:
deactivating any power consumer on the primary circuit or waiting for any power consumer on the primary circuit to be inactive, commanding from the converter an output voltage greater than the voltage of the second electrical voltage source, determining if there is a power transfer from the primary to the secondary circuit, and:

if not, establishing a faulty functionality diagnosis for the converter.

First claim

1 . A method for establishing a functional diagnosis for a buck static DC-DC voltage converter ( 1 ) in an electric or hybrid vehicle comprising a power supply circuit, the latter including at least a first electrical voltage source ( 2 ) supplying a primary circuit ( 3 ) with direct current, and a second electrical voltage source ( 4 ) supplying a secondary circuit ( 5 ) with direct current, the first source ( 2 ) having a voltage value greater than the second source ( 4 ), said primary and secondary circuits ( 3 ) and ( 5 ) being connected to one another by means of said buck static DC-DC voltage converter ( 1 ) which itself is commanded by control and safety means ( 6 ), wherein the method comprises the following steps:
Step ( 10 ): deactivating any power consumer on said primary circuit ( 3 ) or waiting for any power consumer on the primary circuit ( 3 ) to be inactive, Step ( 20 ): then commanding from said converter ( 1 ) an output voltage greater than the voltage of the second electrical voltage source ( 4 ), Step ( 30 ): then determining if there is a power transfer from said primary circuit ( 3 ) to said secondary circuit ( 5 ), and: Step ( 50 ): if not, establishing a faulty functionality diagnosis for said converter ( 1 ).

2 . The method as claimed in claim 1 , wherein the step ( 30 ) of determining if there is a power transfer from said primary circuit ( 3 ) to said secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) increases and if the voltage of the second voltage source ( 4 ) increases.

3 . The method as claimed in claim 1 , wherein the step ( 30 ) of determining if there is a power transfer from said primary circuit ( 3 ) to said secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) increases and if the discharge current of the second voltage source ( 4 ) decreases.

4 . The method as claimed in claim 1 , further comprising a step ( 40 ) of establishing a correct functionality diagnosis for said converter ( 1 ), in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 .

5 . The method as claimed in claim 1 , further comprising the following steps, in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 , and in the case of a current-non-reversible buck static DC-DC voltage converter:
Step ( 31 ): then commanding from said voltage converter ( 1 ) an output voltage that is less than the voltage of the second electrical voltage source ( 4 ),
Step ( 32 ): then determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), and:
Step ( 40 ): if so, establishing a correct functionality diagnosis for said converter ( 1 ),
Step ( 50 ): if not, establishing a faulty functionality diagnosis for said converter ( 1 ).

6 . The method as claimed in claim 5 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the voltage of the second voltage source ( 4 ) decreases.

7 . The method as claimed in claim 5 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the discharge current of the second voltage source ( 4 ) increases.

8 . The method as claimed in claim 2 , further comprising a step ( 40 ) of establishing a correct functionality diagnosis for said converter ( 1 ), in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 .

9 . The method as claimed in claim 2 , further comprising the following steps, in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 , and in the case of a current-non-reversible buck static DC-DC voltage converter:
Step ( 31 ): then commanding from said voltage converter ( 1 ) an output voltage that is less than the voltage of the second electrical voltage source ( 4 ),
Step ( 32 ): then determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), and:
Step ( 40 ): if so, establishing a correct functionality diagnosis for said converter ( 1 ),
Step ( 50 ): if not, establishing a faulty functionality diagnosis for said converter ( 1 ).

10 . The method as claimed in claim 3 , further comprising a step ( 40 ) of establishing a correct functionality diagnosis for said converter ( 1 ), in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 .

11 . The method as claimed in claim 3 , further comprising the following steps, in the case of a noted power transfer from the primary circuit 3 to the secondary circuit 5 , and in the case of a current-non-reversible buck static DC-DC voltage converter:
Step ( 31 ): then commanding from said voltage converter ( 1 ) an output voltage that is less than the voltage of the second electrical voltage source ( 4 ),
Step ( 32 ): then determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), and:
Step ( 40 ): if so, establishing a correct functionality diagnosis for said converter ( 1 ),
Step ( 50 ): if not, establishing a faulty functionality diagnosis for said converter ( 1 ).

12 . The method as claimed in claim 9 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the voltage of the second voltage source ( 4 ) decreases.

13 . The method as claimed in claim 9 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the discharge current of the second voltage source ( 4 ) increases.

14 . The method as claimed in claim 11 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the voltage of the second voltage source ( 4 ) decreases.

15 . The method as claimed in claim 11 , wherein the step ( 32 ) of determining if the second electrical voltage source ( 4 ) discharges into the secondary circuit ( 5 ), involves determining if the discharge current of the first voltage source ( 2 ) decreases and if the discharge current of the second voltage source ( 4 ) increases.

Assignees

• Continental Automotive Gmbh
• Continental Automotive France

Inventors

• Lachaize Jerome
• Verdier Damien

Classifications

• G01R31/40 Primary

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• B60L50/60

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• H02M3/04

  by static converters · CPC title

• B60L11/18

  Operations & Transport · mapped topic

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title