CN108351388B

CN108351388B - Battery diagnosis device

Info

Publication number: CN108351388B
Application number: CN201680067469.4A
Authority: CN
Inventors: A·科托达科斯塔; B·布克利
Original assignee: Peugeot Citroen Automobiles SA
Current assignee: PSA Automobiles SA
Priority date: 2015-11-20
Filing date: 2016-11-18
Publication date: 2021-06-25
Anticipated expiration: 2036-11-18
Also published as: CN108351388A; FR3044099A1; FR3044099B1; WO2017085429A1; EP3377912A1

Abstract

The present invention relates to a battery diagnosis device for a motor vehicle, the battery diagnosis device including: a first measuring means (1) configured for continuously measuring at least one parameter of the battery; and at least one diagnostic component (2) configured to perform a diagnosis of the battery based on the measurement of the at least one parameter, characterized in that the apparatus further comprises second measuring means (3) configured to measure the at least one parameter of the battery point-wise, and in that the at least one diagnostic component is configured to determine a faulty battery state when the data measured by the first measuring means and the data measured by the second measuring means differ with respect to each other by a difference greater than a predetermined threshold value.

Description

Battery diagnosis device

Technical Field

The present invention relates generally to a battery diagnosis device, and more particularly to a battery diagnosis device mounted on a motor vehicle of the PHEV (plug-in electric vehicle) type.

Background

New ISO standards were implemented in 2012. The standard has a novel functional safety reference system suitable for the automotive industry. The standard is therefore intended to enhance the reliability of the onboard electronics. For each function of the onboard electronic system, standard ISO26262 defines a plurality of Safety Integrity Levels (ASIL, i.e. automatic Safety Integrity Levels). These requirements levels, labeled from a (least dangerous) to D (most dangerous), can verify that the system components produced by the equipment and manufacturer meet the safety goals of the function. To ensure these safety levels required, the requirements of standard ISO26262 apply to different fields throughout the vehicle life cycle: the organization field, the file (documentaire) field, and the technical field.

Generally, a motor vehicle of the PHEV type (i.e. a rechargeable electric hybrid vehicle) carries a battery and an electrical architecture capable of implementing diagnostics on the battery, preferably a 12V battery.

In such conventional electrical architectures, the vehicle includes a diagnostic component, such as a vehicle battery charge evaluation box (BECB), which is capable of continuously performing diagnostics on a 12V battery, but which is generally not capable of covering high ASIL levels. However, the architecture under study requires battery diagnostics arranged at a higher level (ASILB) in order to comply with the new standard.

For example, in a "traditional" electrical architecture and in a typical architecture corresponding to a "stop-start" operation, it is recognized that the battery-provided ASIL class is the ASILB class and that the battery diagnostic system is sufficient, since the following components/life stages allow this goal to be achieved.

In fact, in the first life phase of the battery, the stimuli resulting from the first start-up enable a power test to be carried out which gives a good indication of the state of health of the battery. This situation is confirmed in the conventional architecture. Then, in a second life phase, during operation the battery excitation remains low, the alternator provides the greater part of the energy, and the battery powers the actuators (DAE, ESP, etc.) with relatively short operating times. This situation is also confirmed on the conventional architecture. Finally, in the third life phase, i.e. when the vehicle speed is less than 25km/h, the loss of supply of the safety member is of the ASIL B class in which the battery is located.

The battery monitoring device (BECB) permanently calculates the battery state of charge and thus indicates state of health information sufficient for the second and third life phases. Conversely, in a new PHEV vehicle, which will occur in the future, one or more of the life stages explained above are no longer implemented. For example, in a PHEV vehicle, the first and third life phases described above are not validated because there is no first request for a starter and the speed may be greater than 20 km/h.

In view of the above information, in order to ensure the required ASILB level, it is therefore necessary to find a new diagnostic component for diagnosing a battery loaded in a PHEV vehicle. Different diagnostic components have been developed.

For example, document DE102014004791 describes the use of DC/DC in a PHEV electrical architecture to carry out diagnostics on the connection between the on-board network and the battery. To this end, the DC/DC generates a signal modulated between 50Hz and 200Hz, and the device then calculates the resistance between the two terminals of the battery and determines the quality of the connection. However, this type of device is not able to improve the ASIL level as required by the new standard.

Disclosure of Invention

The object of the present invention is to overcome the drawbacks of the above-mentioned prior art documents and in particular to provide a battery diagnosis device which enables the battery to comply with new safety standards.

To this end, a first aspect of the invention relates to a battery diagnosis device for a motor vehicle, the battery diagnosis device including: a first measuring means configured to continuously measure at least one parameter of a battery; at least one diagnostic component configured to perform a diagnosis of the battery based on a measured value of at least one parameter being measured, characterized in that the apparatus further comprises a second measuring means configured to measure the at least one parameter of the battery at a point of origin (de mani e hole), and the at least one diagnostic component is configured to determine a faulty battery condition when the data measured by the first measuring means and the data measured by the second measuring means differ with respect to each other by a difference value larger than a predetermined threshold value. Thus, the diagnostic components are separated and enhanced to have diagnostics on the diagnostics to increase ASIL, and a distributed diagnostic architecture is achieved to better control the ASIL level of each component.

Advantageously, the battery is part of an on-board network and the second measuring means are further configured for isolating a first sub-network comprising the battery, the first measuring means and a power source from the rest of the on-board network. In this way, in the measurement by the second measuring means, there is no conflict with the load of the vehicle.

A particularly advantageous embodiment is that the power source is a starter or an alternator starter.

Advantageously, the at least one parameter of the battery that is measured is at least one of voltage, current, temperature and state of charge. In this way, measurements of a wide variety of data may be performed.

Advantageously, the measured voltage is a no-load voltage. In this way, the measured voltage is very reliable.

A particularly advantageous embodiment is that the measured current is a charging and/or discharging current. In this way, the measured current is very reliable.

Advantageously, said at least one diagnostic component is implemented in at least one of said first measuring means and said second measuring means. In this way, the addition of additional components, optionally bulky, is avoided.

Advantageously, the second measuring means is configured for periodically measuring said at least one parameter. In this way, the diagnosis is repeated to improve ASIL.

Advantageously, said second measuring means are configured for measuring said at least one parameter according to a predefined motive (motif). Thus, a measuring motivation adapted according to the electric network and the battery fitted in the vehicle may be defined.

A particularly advantageous embodiment is that the first measuring means is a battery charge evaluation box. In this way, continuous measurements are reliably performed during operation.

A second aspect of the invention relates to a motor vehicle comprising at least one battery diagnostic device according to the first aspect of the invention.

Drawings

Other characteristics and advantages of the invention will become clearer from the following detailed description of an embodiment of the invention, given as a non-limiting example, and the accompanying drawings, on which:

fig. 1 schematically shows a battery diagnosis device for a motor vehicle according to a preferred embodiment of the present invention.

Detailed Description

Fig. 1 shows a battery diagnosis apparatus for a motor vehicle according to a preferred embodiment of the present invention. The battery diagnosis device comprises in particular a first measuring means 3, preferably a battery charge evaluation box, configured for continuously measuring at least one parameter of the battery (for example the charge or discharge current or voltage of the battery). The battery diagnosis device further comprises second measuring means 2 configured to measure at least one parameter of the battery (e.g. the charging or discharging current or voltage of the battery (as with the first measuring means)) point-wise.

The battery diagnosis apparatus further includes at least one diagnosis component 1 configured to perform diagnosis of the battery based on the measurement of the at least one parameter, and to determine a faulty battery state when data measured by the first measurement means and data measured by the second measurement means differ with respect to each other by a difference greater than a predetermined threshold. This diagnostic component is implemented by software and is implemented in at least one of the first measuring means 3 and the second measuring means 2 or in any means having computing power.

Furthermore, it is noted that the battery is part of an on-board network and that the second measuring means 2 are also configured for isolating a first sub-network comprising the battery, the first measuring means 3 and a power source (e.g. a starter or an alternator starter) from the rest of the on-board network, which thus constitutes a second sub-network separate from the first sub-network. To this end, the second measuring means 2 comprise, on the one hand, measuring components and, on the other hand, relays (or any other component capable of isolating the sub-network), for example using MOS.

The at least one parameter of the battery being measured is at least one of voltage, current, temperature and state of charge. Preferably, the measured voltage is a no-load voltage and the measured current is a charging and/or discharging current.

Finally, it is noted that preferably the second measuring means 2 are configured for measuring said at least one parameter periodically (for example every few milliseconds) and according to a predefined incentive (i.e. for example 50 amperes during 700 milliseconds, followed by 100 amperes during 200 milliseconds).

The invention also relates to a motor vehicle comprising at least one diagnostic device as described above.

It is understood that various changes and/or modifications obvious to those skilled in the art may be added to the different embodiments of the invention described in the present description without departing from the scope of the invention as defined by the appended claims.

Claims

1. A battery diagnostic device for a motor vehicle, the battery diagnostic device comprising:

a first measuring means (3) configured for continuously measuring at least one parameter of the battery,

at least one diagnostic component (1) configured to perform a diagnosis of the battery based on the measurement of the at least one parameter,

characterized in that the device further comprises:

a second measuring means (2) configured for measuring at least one parameter of the battery point-wise,

and the at least one diagnostic component is configured to determine a faulty battery state when the data measured by the first measuring means and the data measured by the second measuring means differ with respect to each other by a difference greater than a predetermined threshold.

2. The diagnostic device according to claim 1, characterized in that the battery is part of an on-board network and the second measuring means (2) are further configured for isolating a first sub-network comprising the battery, the first measuring means (3) and a power source from the rest of the on-board network.

3. The diagnostic device of claim 1 or 2, wherein the at least one parameter of the battery being measured is at least one of voltage, current, temperature and state of charge.

4. The diagnostic device of claim 3, wherein the measured voltage is a no-load voltage.

5. A diagnostic device as claimed in claim 3, characterized in that the measured current is a charging and/or discharging current.

6. The diagnostic device according to any one of claims 1, 2, 4 and 5, characterized in that said at least one diagnostic component (1) is implemented in at least one of said first measuring means (3) and said second measuring means (2) or in any means having computing power.

7. The diagnostic device according to any one of claims 1, 2, 4 and 5, wherein said second measuring means (2) is configured for periodically measuring said at least one parameter.

8. The diagnostic device according to any one of claims 1, 2, 4 and 5, characterized in that said second measuring means (2) are configured for measuring said at least one parameter according to a predefined incentive.

9. The diagnostic device according to any one of claims 1, 2, 4 and 5, wherein the first measuring member (3) is a battery charge evaluation cartridge.

10. A motor vehicle comprising at least one diagnostic device according to any one of the preceding claims.