A diagnostic method for relays in a battery management system
A technology of a battery management system and a diagnosis method, which is applied in the field of relay diagnosis in the battery management system, can solve the problems of inability to further determine the relay fault type or drive fault type, the single relay diagnosis state, and the inability of the whole vehicle to be under high voltage, etc. The effect of driving safety, easy implementation, and simple diagnosis method
Active Publication Date: 2022-05-03
智新控制系统有限公司
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Problems solved by technology
In the battery pack, the circuit of double relays is often used, and the capacitive load is connected. Due to improper timing, it is easy to cause failures such as relay adhesion, which will cause failures such as the failure of the whole vehicle to power down the high voltage, thereby causing safety hazards.
[0003] Currently, a voltage sampling loop is generally added to the relay control terminal, and the relay is detected by detecting the voltage value of the sampling loop when the relay operates to diagnose whether the relay is stuck. The current scheme has a single diagnostic status of the relay, which can only detect whether the relay is stuck, and cannot be further judged. Relay fault type or drive fault type
Method used
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[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
[0019] The relay is the control component of the high-voltage circuit, and its faults mainly include drive faults and high-voltage contact faults.
[0020] The main types of drive faults and high-voltage contact faults are as follows:
[0021] serial number Drive failure type High Voltage Contact Fault Types 1 Coil shorted to supply (STB) contact normally open sticking 2 Coil shorted to ground (STD) Normally closed contacts 3 Coil Ope...
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The invention discloses a diagnosis method for a relay in a battery management system. The process is: control the coil input of the normally open relay to be low level, collect the coil input terminal voltage and contact input terminal voltage of the normally open relay, and calculate the coil input terminal voltage and contact input terminal voltage when the coil input terminal voltage is greater than the set value. The ratio of the input terminal voltage, according to the comparison between the ratio and the first interval value and the second interval value, judges whether there is a coil open circuit fault, a coil short power fault or a contact normally closed adhesion fault. The relay diagnosis method of the present invention is simple, easy to realize, and low in cost, can judge whether the relay fails and the current state, and enhances the control of the relay in the battery management system, thereby improving driving safety.
Description
technical field [0001] The invention belongs to the technical field of automotive electronics, and in particular relates to a diagnostic method for a relay in a battery management system. Background technique [0002] During the start-up process of electric vehicles, high-voltage power-on operation is required to complete the control of high-voltage relays, pre-charging relays, heating relays, etc. In the battery pack, a double-relay circuit is often used and connected to a capacitive load. Due to improper timing, it is easy to cause failures such as relay adhesion, which may cause failures such as the failure of the vehicle to operate at high voltage, thereby causing safety hazards. [0003] Currently, a voltage sampling loop is generally added to the relay control terminal, and the relay is detected by detecting the voltage value of the sampling loop when the relay operates to diagnose whether the relay is stuck. The current scheme has a single diagnostic status of the rel...
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IPC IPC(8): G01R31/327G01R31/52G01R31/54G01R31/00
CPCG01R31/3275G01R31/006
Inventor 张超左珊珊刘丰华
Owner 智新控制系统有限公司