Diagnostic circuit and diagnostic method for detecting electric vehicle high-voltage relay fault

A technology of high-voltage relays and electric vehicles, applied in the direction of circuit breaker testing, etc., can solve problems such as impossibility, complexity, and accidents, and achieve the effect of simple and feasible methods without increasing detection risks

Active Publication Date: 2015-12-09
江苏博沃汽车电子系统有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages and shortcomings of using these relays: the feedback signal of the system detection relay is generally judged by the IO port of the CPU
However, the traditional detection circuit an

Method used

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  • Diagnostic circuit and diagnostic method for detecting electric vehicle high-voltage relay fault
  • Diagnostic circuit and diagnostic method for detecting electric vehicle high-voltage relay fault

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the description of the drawings.

[0015] Such as figure 1 As shown, the diagnostic circuit for detecting the failure of the high-voltage relay of an electric vehicle includes a battery pack that provides power and power for the electric vehicle and a controller that controls the on and off of the electric vehicle relay. The battery pack is composed of multiple batteries in series, and the battery pack has a positive electrode and The negative pole, the two ends of the battery pack are connected to the electrical equipment of the vehicle, and provide power and kinetic energy for the electrical equipment of the vehicle. The electrical equipment of the vehicle includes capacitors and electrical appliances.

[0016] A main positive relay K+ is connected in series between the positive electrode of the battery pack and the electrical equipment of the vehicle, and a series circuit is connected in pa...

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Abstract

The invention discloses a diagnostic circuit and a diagnostic method for detecting electric vehicle high-voltage relay fault. The circuit comprises a battery pack for providing power and a driving force for the electric vehicle and a controller for controlling on and off of an electric vehicle switch element. Two ends of the battery pack are connected with an overall electrical device; a main positive relay K+ is serially connected between the positive electrode of the battery pack and the overall electrical device; two ends of the main positive relay K+ are parallelly connected with a relay R and a pre-charging relay Kp; a main negative relay K- is serially connected between the negative electrode of the battery pack and the overall electrical device; both the battery pack and the overall electrical device are respectively connected with the controller; the controller is used for detecting voltage at two ends of the battery pack, voltage at two ends of the overall electrical device, and voltage at the negative end of the battery pack and the positive end of the overall electrical device. Thus, no peripheral circuit needs to be added, the state of the relay is judged only through carrying out cross detection on voltage at the relay end, whether the relay has a fault can be timely detected, remedial measures can be taken timely, the method is simple, convenient and feasible, and no detection risk is added.

Description

Technical field [0001] The invention relates to the diagnosis of electric vehicle relay failures, in particular to a diagnosis circuit and a diagnosis method for detecting failures of electric vehicle high-voltage relays. Background technique [0002] At present, the relays used in the high-voltage power-on and power-off of electric vehicles are generally divided into two types, one with its own feedback contacts, and the other without feedback contacts. For those with feedback contacts, the actual state of the relay is generally judged by the feedback signal, and for those without feedback contacts, the actual state of the relay is generally not judged. The main shortcomings and shortcomings of using these relays: The feedback signal of the system detection relay is generally judged through the IO port of the CPU. However, traditional detection circuits and methods both need to detect current and voltage, which are relatively complicated, and when an adhesion failure is detecte...

Claims

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Application Information

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IPC IPC(8): G01R31/327
Inventor 朱建新王传杏喜冠南
Owner 江苏博沃汽车电子系统有限公司
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