Battery Isolation Resistance Estimation via Voltage Step Response

The patent applies preliminary action by performing a first fit of the voltage step response model to initial voltage samples taken immediately after connecting the test resistor, before the voltage has time to reach steady state. This allows the steady state voltage to be estimated in advance, enabling rapid isolation resistance determination without waiting for the full charging process to complete.

The patent replaces the traditional time-domain waiting approach with a model-based estimation approach. Instead of physically waiting for the voltage to reach steady state through natural charging, the system uses a voltage step response model fitted to initial samples to mathematically predict the steady state voltage, substituting physical waiting with computational estimation.

The patent implements feedback by determining a quality measure of the first fit and comparing it against a threshold. If the quality measure indicates insufficient accuracy, the system automatically performs a second fit using additional voltage samples, using the feedback from the first fit quality assessment to guide whether more data collection and fitting is needed.

The patent applies partial action by using only the initial voltage samples needed for the first fit, rather than waiting for all possible voltage samples. This allows the measurement process to proceed with partial data, accepting that a second fit may be needed later if the first fit quality is insufficient, thereby enabling faster initial estimation.

The patent applies preliminary action by estimating the steady state voltage and determining isolation resistance before the battery is connected to the high voltage bus. The system performs the voltage model fitting and isolation resistance calculation in advance, ensuring safety verification is completed prior to connection, thus eliminating the safety risk while maintaining fast connection speed.

The patent applies preliminary anti-action by proactively determining isolation resistance before connection to prevent potential safety hazards. The system performs the safety check in advance, counteracting the potential harmful effect of premature connection by ensuring isolation resistance is verified beforehand, thus preventing safety issues before they can occur.