Power Inverter Module (PIM)

WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION

Courtesy of CHRYSLER GROUP, LLC

1 - Coolant Outlet Port

2 - Low Voltage Vehicle Wire Harness Connector

3 - Coolant Inlet Port

4 - PIM Assembly

5 - Low Voltage Resolver Connector

6 - High Voltage Phase Motor Connector

The Motor Control Processor a (MCPA) is integral to the Power Inverter Module (PIM). The MCPA provides the strategy for charging the 12 volt battery and the Power Pack Unit (PPU). The MCPA monitors the High Voltage (HV) system, B+, switched ignition, and Controller Area Network (CAN) bus circuits for any concerns. The MCPA can also detect any internal failures, high temperature and resolver failures.

The MCPA monitors the RPM of the Electric Drive Motor (EDM). The MCPA can increase or decrease the torque of the electric motor to compensate through the PIM HV electric motor connection.

NOTE: The MCPA is flash programmable and is sensitive to cold temperature during module flashing. The MCPA will need to be flashed when the vehicle is at room temperature. Not flashing the module at room temperature can cause the flash procedure to fail to complete, which could lead to an unnecessary component replacement.

The Gen2 PIM is a dual 125kW inverter that supports the use of E-Motors, is protected by a serviceable fuse behind a cover in the HV PDC. The operating voltage range is between 180-450 VDC.

The High Voltage (HV) Power Inverter Module (PIM) is located under the hood, is made of aluminum and is fully insulated. The PIM is part of the Power Electronics Cooling loop to remove the heat that is generated during operation.

PIM Electronic Control Module Vehicle Connection
High Voltage Charging Cable
Coolant "IN" from the Integrated Dual Charging Module IDCM
Coolant "OUT" to the transmission cooler
High Voltage connection to the Electric Drive Motor (EDM)

OPERATION

The PIM is the connection between the battery pack and EDM. It sends the High Voltage Direct Current (HVDC) to power the motors for propulsion.

The amount of current controls the EDM torque.

The frequency of the three-phase AC determines the EDM speed and rotation.

The PIM is also responsible for high voltage battery system temperature control utilizing the following inputs and outputs:

Inputs

Heater Core Coolant Inlet Temperature Sensor
Electric Coolant Heater Inlet Temperature Sensor
High Voltage Battery Coolant Inlet Temperature Sensor
High Voltage Battery Coolant Outlet Temperature Sensor
Low Temperature Radiator Coolant Inlet Temperature Sensor
Passive Pump Coolant Inlet Temperature Sensor
Power Electronics Inlet Temperature Sensor
Power Electronics Outlet Temperature Sensor

Outputs

Electric Coolant Heater
Auxiliary Coolant Pump
Low Temperature Active Coolant Pump
Low Temperature Passive Coolant Pump
High Temperature Shut-off Valve
High Temperature Cabin Valve

The PIM controls the high-level activity of all of the electric powertrain components when the vehicle is plugged in. It communicates with Integrated Dual Charger Module (IDCM), Battery Pack Control Module (BPCM) and Instrument Panel Cluster (IPC) to achieve the following functions:

Initiate Charging
Report Charging Status
Report Charging System Fault
Control Charging
Execute Scheduled Charge