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Method and system for diagnosing the state of a contactor

A contactor, open state technology, used in circuit breaker testing, instruments, relays, etc.

Pending Publication Date: 2020-07-07
FICO TRIAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the aforementioned system is that the contactor may have a different state than the one requested by the controller

Method used

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  • Method and system for diagnosing the state of a contactor
  • Method and system for diagnosing the state of a contactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] figure 1 and figure 2 Embodiments of the system object of the present invention are disclosed, the system includes:

[0043] - The power supply, in particular the system of the embodiment may be provided by the battery (4), or by the on-board charger (15) or by a device operatively connected to the contactors (1, 2) and used to detect the current flow through the device (3) The device is fed by an additional power source (5). This additional power source (5) can be controlled by controller (14),

[0044] - Two contactors (1, 2) operatively connected to the power supply. exist figure 1 In the embodiment shown, the first contactor (1) is associated with the positive terminal of the battery (4). A second contactor (2) is associated with the negative terminal of the battery (4). A controller (14) commands the first contactor (1) and the second contactor (2) to an open state and a closed state.

[0045] - A device (3) for detecting a current passing through said devi...

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Abstract

A method and system for diagnosing the state of a contactor. The system for diagnosing the state of a contactor of an electric vehicle comprises a contactor (1, 2),means (3) for detecting a current passing through the means (3), located in parallel to the contactor (1, 2), and- a controller (14) operatively connected to the contactor (1, 2) and to the means (3) for detecting a current passing through it, the controller (14) being configured for:communicating with the contactor (1, 2) and registering a theoric state of the contactor (1, 2),receiving a signal from the means (3):if current is passing through the means (3), the received signal is open, and if current is not passing through the means (3), the received signal is closed, comparing the theoric state of the contactor with the stateof the contactor received from the means (3) for detecting a current passing through it.

Description

technical field [0001] The present invention relates to systems and methods for diagnosing the status of contactors in electric vehicles. More specifically, the present invention relates to battery circuits for electric vehicles (EV) or hybrid vehicles (HEV) containing circuit components for determining the state of contactors operating in a voltage range above diagnostics. Background technique [0002] In high-voltage systems, power contactors are often used to ensure galvanic isolation between power devices. For example, in a Cut Off Box known in the prior art, there are two main contactors, which isolate the battery from the charger or the load. [0003] During the drive cycle, the contactors are closed to electrically couple the battery with other areas of the powertrain. When the drive cycle is complete, the contactor opens to, for example, protect the battery from relatively high voltages, or to isolate the battery from the rest of the circuit in the event of an isol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G01R15/22
CPCG01R31/3275G01R15/22G01R31/3278B60L3/0069G01R31/007H01H2047/003H01H2047/006H01H47/002Y02T90/16
Inventor M·G·方特E·S·马西普M·M·罗伊格
Owner FICO TRIAD
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