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This invention discloses a self-calibration method and system based on the metrological function of an intelligent measurement switch, relating to the fields of electrical variable measurement and magnetic variable measurement technology. The specific steps of the method are as follows: In a standard metrological test environment, the inherent step electrical signal of the contact pre-breakdown is collected as the sole calibration benchmark; parameters are extracted to construct a full-condition benchmark library and encrypted for read-only storage; real-time signals are synchronously acquired during equipment operation with phase-locked loop, and orthogonal decomposition is used to purify and match benchmark features; combined with multi-physics parameters, errors are separated through a decoupling model, and amplitude and phase errors are calculated; calibration coefficients are generated and transmitted via a verification bus; calibration verification and fault tolerance processing are completed through dual-channel verification. This invention achieves in-situ calibration without shutdown by using the inherent signal of the device as a benchmark and encrypting its storage; multi-source errors are separated through phase-locked acquisition and orthogonal decoupling, improving metrological correction accuracy; and a closed loop is formed through an adaptive algorithm and dual-channel verification to ensure accurate calibration and stable equipment operation.

The invention discloses a UDS-based vehicle ECU security access and firmware online upgrading method. The method comprises the following steps: establishing a diagnosis communication link with a target ECU; executing a security access unlocking process based on an external configurable security algorithm component by diagnosing the communication link; after the security access is unlocked, the target ECU is controlled to enter a programmable session state and complete storage area preparation by diagnosing a communication link; analyzing the firmware file to be upgraded into a plurality of data blocks; sequentially transmitting the plurality of data blocks to a prepared storage area of the target ECU based on the diagnostic communication link; and after the plurality of data blocks are all transmitted and all pass the verification, executing a reset operation for the target ECU. Security access unlocking is executed through an external configurable security algorithm component, and flexible configuration of a security mechanism and compatibility of multiple manufacturers are achieved; and through block transmission verification and a failure retransmission mechanism, the data transmission robustness and the firmware upgrading reliability are improved.