Nissan Ariya: System

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

Front Traction Motor System
Front Traction Motor Power Control
Front Traction Motor Regeneration Control

Front Traction Motor System

System Description

The inverter (front) controls the front traction motor based on the target motor torque signal transmitted by EV system CAN from the VCM.
Inverter (front) converts DC power from Li-ion battery to AC power, and drives front traction motor accurately based on resolver detection signal and current sensor detection signal.
At deceleration, front 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 (front) transmits the following signals to the VCM via the EV system CAN. Front motor speed signal Front motor torque limit signal Motor discharge status signal Input high voltage signal Coolant temperature sensor signal The inverter (front) receives the following signals from the VCM via the EV system CAN. HV battery relay ON permit signal Inverter (front) operation command signal Inverter (front) traction limitation signal HV sleep wake up signal Power switch ON signal Coolant flow rate signal Total mileage signal Safety torque signal Target front 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 (front) receives the following signals from the LBC via the EV system CAN. HV battery total voltage signal DTC signal
Front traction motor Front traction motor resolver Front traction motor temperature sensor Front traction motor oil temperature sensor Front traction motor oil pump		Refer to Component Description.
Inverter (front) 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		Refer to Component Description.

Circuit Diagram

Fail-safe

DTC		EV system warning lamp	Fail-safe and Nissan Ariya vehicle behavior
P030A	62	—	—
P0A00	11	—	Send coolant temperature that cannot be used to VCM
P0A00	13	—	Send coolant temperature that cannot be used to VCM
P0A1B	01	ON	Control of the front traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
	03	ON
	04	ON
	05	ON
	44	—	—
P0A2A	11	ON	Send front traction motor temperature of 180°C (356°F) to the VCM
	13	ON	Send front traction motor temperature of 180°C (356°F) to the VCM
	4B	ON	The driving torque of the front traction motor is limited to 0 Nm
P0A3F	04	ON	Control of the front traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0A3F	1C	ON
P0A51	01	ON	Control of the front traction motor stops
P0A78	48	ON	Limits drive torque of front traction motor
P0A78	62	ON	Control of the front traction motor stops. Or, no limitation
P0A8B	A2	ON	Control of the front traction motor stops
P0AED	11	—	—
	13	—
	1C	—
	4B	ON	The driving torque of the front traction motor is limited to 0 Nm. Or, control of the front traction motor stops
P0BE5	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0BE9	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0BED	1C	ON	The Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
P0BFF	11	ON	Control of the front traction motor stops
	12	ON
	18	ON
P0C0B	01	ON	Control of the front traction motor stops. Or, the Nissan Ariya vehicle cannot be started (READY status cannot be achieved)
	04	ON
	1C	ON
	A2	ON
P0CBC	11	ON	—
	13	ON	—
	4B	ON	The driving torque of the front traction motor is limited to 0 Nm
P0CC1	04	ON	The driving torque of the front traction motor is limited to 30%
	81	ON	—
	87	ON	The driving torque of the front traction motor is limited to 30%
P0D2D	17	ON	Control of the front traction motor stops
P0DA8	00	ON	Control of the front 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)
P2D3B	92	ON	—
P2E28	01	ON	Control of the front traction motor stops
	18	ON	Control of the front traction motor stops
	1D	ON	—
P2E2B	11	ON	Control of the front traction motor stops
	12	ON
	1C	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	—	—
U2143	82	May turn ON	Nissan Ariya Vehicle stops (torque 0 Nm), or the driving torque of the front 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 front traction motor is limited. Or, no limitation
	83	May turn ON
	87	May turn ON
U2150	87	—	—

Protection Function

When temperature of inverter (front) or front traction motor components rises, the inverter (front) 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 front traction motor is overheated.	The output torque from the front traction motor is restricted according to the temperature.	The temperature has decreased to normal in the front traction motor.
The IGBT becomes hot.	The switching frequency in the IGBT is reduced. NOTE: Electromagnetic noise has increased at the front traction motor.	The temperature has decreased.
The inside of the inverter, including the IGBT, is overheated.	The output torque from the front traction motor is restricted according to the temperature.	The temperature has decreased.

Condition

Control

Normal return condition

The front traction motor is overheated.

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

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

The IGBT becomes hot.

The switching frequency in the IGBT is reduced.

NOTE:

Electromagnetic noise has increased at the front traction motor.

The temperature has decreased.

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

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

The temperature has decreased.

Front Traction Motor Power Control

System Description

DESCRIPTION

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

ENERGY FLOW

(4)	⇐	(3)	⇐	(2)	⇐	(1)
The driving torque from the front traction motor is used as motion energy for output from the Nissan Ariya vehicle.	⇐	DC power sent from the inverter (front) 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.	⇐	Switching actions in the inverter (front) (IGBT) convert DC power from the Li-ion battery into AC power.	⇐	The DC power from the Li-ion battery is input to the inverter (front).

Front Traction Motor Regeneration Control

System Description

DESCRIPTION

During deceleration, the inverter (front) drives the front 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 front 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

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