EV High-Voltage Circuit Control for Safe Relay Opening
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Solution Overview
Problem
In electric vehicles, the existing methods for controlling high-voltage system circuits are inadequate in ensuring safety during urgent failures, as they fail to reliably turn off relays, leading to potential hidden dangers and security risks.
Innovation Solution
A method and system that judiciously control the high-voltage system circuit by checking the states of positive and pre-charging contactors before sending turn-off instructions, ensuring the circuit is opened safely, and includes a detection mechanism to verify the off-state of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If simple control method is used to turn off relays during urgent failure, then response speed is improved, but reliability of relay turning off deteriorates
Solution Approach 1:
The patent implements a feedback mechanism by detecting whether the high-voltage system circuit is in a closed-circuit state after receiving an opening instruction, and by detecting whether relays are in turned-off state. This feedback allows the system to verify the actual state of the circuit and relays, ensuring reliable opening even during urgent failures.
Solution Approach 2:
The patent performs preliminary detection of the circuit state and relay states before executing the turning-off operation. By checking whether the circuit is in closed-circuit state and whether relays are in on-state before sending turning-off instructions, the system prepares the optimal turning-off strategy in advance, ensuring both speed and reliability.
2Ease of operation
If simple control method is used to turn off relays during urgent failure, then operation simplicity is improved, but safety of electric vehicle deteriorates
Solution Approach 1:
The system automatically detects the circuit state and relay states, providing feedback to determine the appropriate turning-off strategy. This automated feedback mechanism maintains operation simplicity while ensuring safety by preventing incorrect or incomplete relay turning-off operations.
Solution Approach 2:
The control system performs self-diagnosis and self-adjustment by detecting its own state (circuit closed/open state, relay on/off state) and automatically selecting the appropriate turning-off sequence. This self-service capability ensures safety without requiring complex manual intervention.
3Device complexity
If relay turning off state is not detected, then control process simplicity is improved, but ability to correct errors deteriorates
Solution Approach 1:
The patent implements detection of relay turning-off state through feedback mechanisms that monitor whether relays are in on-state or off-state. This feedback enables the system to verify successful relay opening and to detect and correct any errors in the turning-off process.
Solution Approach 2:
The patent replaces manual verification of relay states with automated detection mechanisms. The control system automatically detects whether relays are in the required states, substituting mechanical/manual checking with electronic sensing and control, thereby maintaining simplicity while enabling error detection and correction.
Data Source
AI summary
A method for controlling a high-voltage system circuit of an electric vehicle comprises: judging whether the circuit is in a closed-circuit state after receiving an instruction of opening the circuit; judging whether the positive contactor is in an on-state and whether an instruction of turning on the positive contactor is valid if the circuit is in a closed-circuit state; sending an instruction of turning off the positive contactor if the positive contactor is in an on-state and the instruction of turning on the positive contactor is valid; sending an instruction of turning off the negative contactor; judging whether the pre-charging contactor is in an on-state and whether an instruction of turning on the pre-charging contactor is valid; sending an instruction of turning off the pre-charging contactor if the pre-charging contactor is in an on-state and the instruction of turning on the pre-charging contactor is valid.