ELECTRIC LEAKAGE DIAGNOSIS APPARATUS FOR VEHICLE USING INSULATION RESISTANCE SENSOR, AND CONTROL METHOD THEREOF

摘要

The present invention relates to a device for diagnosing a vehicle using an insulation resistance measurement sensor, comprising an insulation resistance measurement sensor for measuring and outputting insulation resistance between a high voltage battery and a chassis; a main switching part for selectively supplying, to an electronic load of the vehicle, power supplied from the high voltage battery by external control; and a battery power management part for stopping the operation of a driving part for controlling a driving motor of the vehicle if a value of first insulation resistance outputted from the insulation resistance measurement sensor is smaller than the predetermined threshold value, determining insulation breakdown in the driving part if a value of second insulation resistance exceeds the threshold value after the operation of the driving part is stopped, and stopping the operation of the vehicle by switching off the main switching part to block the power supplied from the high voltage battery to the electronic load of the vehicle, thereby minimizing a secondary safety accident due to unconditional blockage of a high voltage circuit when electrical leakage due to insulation resistance is detected. [Reference numerals] (AA) Start; (BB) End; (S205) Measure insulation resistance; (S210) First insulation resistance < Threshold value; (S215) Turn on an alarm light (=BMS FAULT), Initiate a fault diagnosis algorithm of IDU; (S220) Temporarily coast a vehicle with a U, V, W phase control suspension request; (S230) Second insulation resistance > Threshold value; (S240) Prohibit entering into a Limp-Home mode if it is confirmed that insulation breakdown has occurred in one of U. V, W phases; (S250) Switch off a main switching part and stop the operation of the vehicle if DTC (= driving motor insulation breakdown) occurs