Low-voltage network with a DC-DC converter and method for testing a low-voltage battery by employing pulses feed to the low-voltage battery to sense either voltage or current response

• US 9,983,267 B2
• Filed: 07/05/2013
• Issued: 05/29/2018
• Est. Priority Date: 09/05/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fassnacht, Jochen, Schmucker, Clemens
• Primary Examiner(s): Grant, Robert
• Assistant Examiner(s): TRISCHLER, JOHN T
• Application Number:
  US14/425,484
• Publication Number:
  US 20150219725A1
• Time in Patent Office: 1,789 Days
• Field of Search: 324426
• CPC Class Codes: G01R 29/02 Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
• CPC Class Codes: G01R 31/36 Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
• CPC Class Codes: G01R 31/385 Arrangements for measuring battery or accumulator variables for monitoring G01R31/382

Abstract

The invention relates to a DC-DC converter which is designed to supply a low-voltage network comprising a low-voltage battery and a battery sensor circuit with a low voltage, having a pulse generation device which is designed to feed electrical pulses into the low-voltage network in order to test the low-voltage battery using the battery sensor circuit.

Claims

1. A DC-DC converter, which is configured to supply a low voltage to a low-voltage network that includes a low-voltage battery and a battery sensor circuit, the DC-DC converter comprising:

a pulse generation device, which is configured to

feed characteristic electrical pulses in a targeted manner for identifying a defect of the low-voltage battery through the battery sensor circuit into the low-voltage network, wherein the characteristic electrical pulses are at least one selected from a group consisting of a square-wave waveform, a saw-tooth waveform, and a sinusoidal waveform, and

transmit parameters relating to the characteristic electrical pulses to a network management device via a communications interface, wherein the network management device includes a synchronization device configured to synchronize the generation of the characteristic electrical pulses with the detection of operational parameters of the low-voltage battery using the parameters transmitted from the pulse generation device, wherein the generation of the characteristic electrical pulses occurs at the same time as the detection of operational parameters of the low-voltage battery,

wherein a low-voltage consumer connected to the DC-DC converter is actuated to follow a safe actuation strategy in response to identifying a defect of the low-voltage battery, and

wherein the DC-DC converter couples a high-voltage network of an electrical drive or generator system to the low-voltage network and supplies electrical energy to the low-voltage network from the high-voltage network.

2. The DC-DC converter as claimed in claim 1, wherein the pulse generation device is configured to generate at least one of a group consisting of current pulses, voltage pulses, and power pulses.

3. The DC-DC converter as claimed in claim 1, wherein the characteristic electrical pulses dynamically excite the low-voltage battery.

4. The DC-DC converter as claimed in claim 1, wherein the defect of the low-voltage battery includes at least one selected from a group consisting of a malfunction of the low-voltage battery, an anomaly of the low-voltage battery, and a failure of the low-voltage battery.

5. The DC-DC converter as claimed in claim 1, wherein the pulse generation device is configured to feed a multiplicity of characteristic electrical pulses in a predetermined sequence into the low-voltage network.

6. The DC-DC converter of claim 5, wherein a number of successive characteristic pulses included in the predetermined sequence of the multiplicity of characteristic electrical pulses is varied to eliminate disturbances in the low-voltage consumer.

7. A low-voltage network, comprising:

a DC-DC converter as claimed in claim 1;

a low-voltage battery; and

a battery sensor circuit, which is configured to detect operational parameters of the low-voltage battery depending on the characteristic electrical pulses generated by the DC-DC converter and identify a defect of the low-voltage battery based on the operational parameters.

8. The low-voltage network as claimed in claim 7, wherein the battery sensor circuit has a detection device, a current sensor and a voltage sensor, and wherein the detection device is configured to detect the current from the low-voltage battery or into the low-voltage battery via the current sensor and to detect the voltage drop across the low-voltage battery via the voltage sensor.

9. The low-voltage network as claimed in claim 7, wherein the operational parameter of the low-voltage battery includes at least one selected from a group consisting of a temperature of the low-voltage battery, a performance parameter of the low-voltage battery, and an internal resistance of the low-voltage battery.

10. The low-voltage network as claimed in claim 7, wherein the battery sensor circuit detects the operational parameters of the low-voltage battery independently of a load consumption of the low-voltage network.

11. A method for testing a low-voltage battery, the method comprising:

generating characteristic electrical pulses in a targeted manner by means of a DC-DC converter, which is configured to supply a low voltage to a low-voltage network that includes a low-voltage battery and a battery sensor circuit;

feeding the characteristic electrical pulses into the low-voltage network, wherein the characteristic electrical pulses are at least one selected from a group consisting of a square-wave waveform, a saw-tooth waveform, and a sinusoidal waveform;

transmitting parameters relating to the characteristic electrical pulses to a network management device via a communications interface;

detecting operational parameters of the low-voltage battery by means of the battery sensor circuit depending on the characteristic electrical pulses, wherein the detection of the operational parameters of the low-voltage battery is synchronized with the generation of the characteristic electrical pulses using the parameters transmitted to the network management device, wherein the generation of the characteristic electrical pulses occurs at the same time as the detection of operational parameters of the low-voltage battery;

identifying a defect of the low-voltage battery based on the operational parameters; and

in response to identifying a defect of the low-voltage battery, actuating a low-voltage consumer to follow a safe actuation strategy based on the detected operational parameters,

wherein the DC-DC converter couples a high-voltage network of an electrical drive or generator system to the low-voltage network and supplies electrical energy to the low-voltage network from the high-voltage network.

12. The method as claimed in claim 11, wherein the characteristic electrical pulses include at least one of a group consisting of current pulses, voltage pulses, and power pulses.

13. The method as claimed in claim 11, further comprising:

transmitting the operational parameters of the low-voltage battery from the battery sensor circuit to the network management device via the communications link; and

actuating, with the network management device, the DC-DC converter based on the operational parameters of the low-voltage battery.

14. The method as claimed in claim 11, further comprising:

notifying a user about the defect of the low-voltage battery.