Nissan Ariya: System

Nissan Ariya (FE0) 2023-2025 Service & Repair Manual / Electric Power Train / Traction Motor System :: Rear Traction Motor / Description / System

Rear Traction Motor System
Rear Traction Motor Power Control
Rear Traction Motor Regeneration Control

Rear Traction Motor System

System Description

The inverter (rear) controls the rear traction motor based on the target motor torque signal transmitted by EV system CAN from the VCM.
Inverter (rear) converts DC power from Li-ion battery to AC power, and drives rear traction motor accurately based on resolver detection signal and current sensor detection signal.
At deceleration, rear traction motor is used as generator. It converts kinetic energy generated by rotary motion of tires (AC power) to electric energy (DC power) and charges Li-ion battery.
If malfunction is detected, the system enters fail-safe mode. Refer to Fail-safe.

SYSTEM DIAGRAM

Component	Description
VCM	The inverter (rear) transmits the following signals to the VCM via the EV system CAN. Rear motor speed signal Rear motor torque limit signal Motor discharge status signal Input high voltage signal Coolant temperature sensor signal The inverter (rear) receives the following signals from the VCM via the EV system CAN. HV battery relay ON permit signal Inverter (rear) operation command signal Inverter (rear) traction limitation signal HV sleep wake up signal Power switch ON signal Coolant flow rate signal Total mileage signal Safety torque signal Target rear motor torque signal Pulse signal OFF signal System cut off signal Vibration control switching signal Motor discharge request signal Regenerative torque command signal
LBC	The inverter (rear) receives the following signals from the LBC via the EV system CAN. HV battery total voltage signal DTC signal
Inverter (rear) Motor controller Driver Power module Excitation module Smoothing condenser Current sensor Discharge resister Power module temperature sensor Driver print circuit board temperature sensor Excitation print circuit board temperature sensor Coolant temperature sensor	Component Description
Rear traction motor Rear traction motor resolver Rear traction motor temperature sensor Rear traction motor oil temperature sensor Rear traction motor oil pump	Component Description

Circuit Diagram

Fail-safe

DTC		EV system warning lamp	Fail-safe and Nissan Ariya vehicle behavior
P030A	62	—	—
P0A1C	01	ON	Control of the rear traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
	03	ON
	04	ON
	05	ON
	44	—	—
P0A30	11	ON	Send rear traction motor temperature of 180°C (356°F) to the VCM
	13	ON	Send rear traction motor temperature of 180°C (356°F) to the VCM
	4B	ON	The driving torque of the rear traction motor is limited to 0 Nm
P0A45	04	ON	Control of the rear traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0A45	1C	ON
P0A55	01	ON	Control of the rear traction motor stops
P0A79	48	ON	Limits drive torque of rear traction motor
P0A79	62	ON	Control of the rear traction motor stops. Or, no limitation
P0A8B	A2	ON	Control of the rear traction motor stops
P0AF2	11	—	—
	13	—
	1C	—
	4B	ON	The driving torque of the rear traction motor is limited to 0 Nm. Or, control of the rear traction motor stops
P0BF1	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0BF5	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0BF9	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0C02	11	ON	Control of the rear traction motor stops
	12	ON
	18	ON
P0C0E	01	ON	Control of the rear traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
	04	ON
	1C	ON
	A2	ON
P0DA3	17	ON	Control of the rear traction motor stops
P0DA9	00	ON	Control of the rear traction motor stops
P161D	61	—	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P161E	68	—	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P161F	64	—	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P2BD8	11	—	Send coolant temperature that cannot be used to VCM
P2BD8	13	—	Send coolant temperature that cannot be used to VCM
P2D3B	92	ON	—
P3081	44	ON	Change the resolver offset value to the default value. This reduces torque because optimal control of the rotor position is not possible
P3082	44	ON	Change the rotor resistance value to the default value. This will make it more likely that torque will be limited for temperature protection
P3083	44	—	—
P30D0	11	ON	—
	13	ON	—
	4B	ON	The driving torque of the rear traction motor is limited to 0 Nm
P30E5	04	ON	The driving torque of the rear traction motor is limited to 30%
	81	ON	—
	87	ON	The driving torque of the rear traction motor is limited to 30%
P30E6	11	ON	Control of the rear traction motor stops
	12	ON
	1C	ON
P30E7	01	ON	Control of the rear traction motor stops
	18	ON	Control of the rear traction motor stops
	1D	ON	—
U2143	82	May turn ON	Nissan Ariya Vehicle stops (torque 0 Nm), or the driving torque of the rear traction motor is limited, or is not limited
	83	May turn ON
	87	May turn ON
U2144	82	May turn ON	The driving torque of the rear traction motor is limited. Or, no limitation
	83	May turn ON
	87	May turn ON
U2150	87	—	—

Protection Function

When temperature of inverter (rear) or rear traction motor components rises, the inverter (rear) temporarily enters a protective control state in order to protect the system. It automatically returns to the normal status if the safety is secured.

Condition	Control	Normal return condition
The rear traction motor is overheated.	The output torque from the rear traction motor is restricted according to the temperature.	The temperature has decreased to normal in the rear traction motor.
The IGBT becomes hot.	The switching frequency in the IGBT is reduced. NOTE: Electromagnetic noise has increased at the rear traction motor.	The temperature has decreased.
The inside of the inverter, including the IGBT, is overheated.	The output torque from the rear traction motor is restricted according to the temperature.	The temperature has decreased.

Condition

Control

Normal return condition

The rear traction motor is overheated.

The output torque from the rear traction motor is restricted according to the temperature.

The temperature has decreased to normal in the rear traction motor.

The IGBT becomes hot.

The switching frequency in the IGBT is reduced.

NOTE:

Electromagnetic noise has increased at the rear traction motor.

The temperature has decreased.

The inside of the inverter, including the IGBT, is overheated.

The output torque from the rear traction motor is restricted according to the temperature.

The temperature has decreased.

Rear Traction Motor Power Control

System Description

DESCRIPTION

The inverter (rear) applies AC power to the rear traction motor according to the target motor torque signal calculated by VCM in order to generate drive force.

ENERGY FLOW

(1)	⇒	(2)	⇒	(3)	⇒	(4)
The DC power from the Li-ion battery is input to the inverter (rear).	⇒	The switching actions of the IGBT in the inverter (rear) converts DC power from the Li-ion battery to AC power.	⇒	DC power sent from the inverter (rear) to the rotor, and AC power sent to the stator, are transformed into magnetic energy and used to create a rotating magnetic field that generates driving torque.	⇒	The driving torque from the rear traction motor is used as motion energy for output from the Nissan Ariya vehicle.

Rear Traction Motor Regeneration Control

System Description

DESCRIPTION

During deceleration, the inverter (rear) drives the rear traction motor to function as a generator based on the regenerative torque command signal sent via EV system CAN from the VCM, converting the kinetic torque generated by rotation of the tires into electrical energy. The converted electrical energy charges the Li-ion battery.

The regenerative torque that is generated when the rear traction motor is driven as a generator can be used as braking force, acting similar to engine braking and reducing the burden on the service brakes.

FLOW OF ENERGY

(4)	⇐	(3)	⇐	(2)	⇐	(1)
The DC power regenerated by the inverter (rear) is used to charge the Li-ion battery.	⇐	The IGBT in inverter (rear) switches in order to convert the AC power from the rear traction motor to DC power.	⇐	AC power is generated using DC power sent from the inverter (rear) to the rotor and rotation of the rear traction motor.	⇐	The kinetic energy generated by rotation of the tires operates the rear traction motor as a generator.