A relay state diagnosis method for electric vehicle high voltage circuit
A high-voltage circuit, electric vehicle technology, applied in circuit breaker testing and other directions, can solve problems such as poor reliability, and achieve accurate monitoring and high reliability.
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Embodiment 1
[0038] Such as figure 1 As shown, this embodiment provides a relay state diagnosis method for a high-voltage circuit of an electric vehicle. The high-voltage circuit of an electric vehicle includes a switching circuit composed of at least one relay and a high-voltage source (or a battery pack or a high-voltage component, etc.) , the relay includes a control side and a drive side, the drive side is connected to a high-voltage source, the control side is connected to a controller for sending instructions to the relay, and the relay state diagnosis method includes:
[0039] Step 101: judging whether a closing command has been sent to the relay, if it has been sent, go to step 102, otherwise go to step 104;
[0040] Step 102: Determine whether the current flowing through the control side of the relay is within a reasonable range, if not within the reasonable range, then determine that the relay is in a fault state or the wiring harness of the high-voltage circuit of the electric v...
Embodiment 2
[0051] Such as figure 2 As shown, the relay specifically includes: a pre-charging relay, a positive relay, a charging relay, a heating relay and a negative relay; wherein, the control of the pre-charging relay, the positive relay, the charging relay, the heating relay and the negative relay Both sides are connected with the controller, the driving sides of the pre-charging relay, the positive relay, the charging relay and the heating relay are all connected with the positive pole of the high voltage source, the driving side of the pre-charging relay and the driving side of the positive relay side in parallel, and the drive side of the negative terminal relay is connected to the negative pole of the high voltage source.
[0052] The method adopted in this embodiment is roughly the same as that in Embodiment 1, the difference is that the above method is applied to figure 2 In the circuit of the structure shown.
Embodiment 3
[0054] On the basis of Embodiment 2, before performing step 101, the relay state diagnosis method of this embodiment also includes the following preliminary diagnosis process, such as image 3 Shown:
[0055] Step 201: The controller sends a disconnection command to all relays in the high-voltage circuit of the electric vehicle, and then judges the voltage U across both ends of the high-voltage source batt1 and the voltage across the switching circuit U hv1 Whether the difference is less than the first rated value, if yes, it is judged that both the positive terminal relay and the negative terminal relay are in an adhesion fault state; otherwise, the following steps are performed;
[0056] Step 202: The controller sends a closing command to the positive relay, and then judges the voltage U across both ends of the high voltage source batt2 and the voltage across the drive side of the positive relay U hv2 Whether the difference is less than the second rated value, if yes, it ...
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