Circuit/System Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains two drive motor control modules. Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between each high voltage bus and vehicle chassis. The motor control modules test for isolation when the high voltage contactor relays are closed. The hybrid/EV powertrain control module 2 only tests the hybrid/EV battery pack for high voltage loss of isolation when the high voltage contactor relays are open.