Nissan Altima HL32 Hybrid. Manual - part 568

HYBRID CONTROL SYSTEM

HBC-21

< FUNCTION DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

• The following nomographic charts and the illustrations of the power split planetary gear unit operation for

each vehicle driving condition represent one situation as an example.

Condition of power split planetary gear unit

(D): During Low Load and Constant-Speed Cruising

• When the vehicle is driving under low load and constant-speed cruising conditions, the motive force of the

engine is transmitted by the planetary gears. Some of this motive force is output directly, and the remaining

motive force is used for generating electricity through MG1. Through the use of the electrical path of an

inverter, this electrical power is transmitted to MG2 to be output as the motive force of MG2.

If the SOC level of the HV battery is low, it is charged by MG1 driven by the engine.

• The following represents an example of the power split planetary gear unit operation under normal driving

conditions. The sun gear, carrier and ring gear rotate in the (+) direction. The torque from the engine acts on

the carrier (Engine) in the (+) direction, causing the sun gear and ring gear to react in the (-) direction.

MG1 generates electricity by harnessing the (-) torque that acts on the sun gear.

JMCIA0042GB

Sun Gear (MG1)

Carrier (Engine)

Ring Gear (Output)

Rotational Direction

+

+

+

Torque Condition

+

-

+

JMCIA0046GB

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< FUNCTION DIAGNOSIS >

HYBRID CONTROL SYSTEM

• The following nomographic charts and the illustrations of the power split planetary gear unit operation for

each vehicle driving condition represent one situation as an example.

Condition of power split planetary gear unit

(E): During Full Throttle Acceleration

• When the vehicle driving condition changes from low load cruising to full-throttle acceleration, the system

supplements the motive force of MG2 with electrical power from the HV battery.

JMCIA0042GB

Sun Gear (MG1)

Carrier (Engine)

Ring Gear (Output)

Rotational Direction

+

+

+

Torque Condition

-

+

-

JMCIA0047GB

HYBRID CONTROL SYSTEM

HBC-23

< FUNCTION DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

• When more engine power is required, in order to increase the engine speed, the rotation speeds of the

related gears change as follows. The directions in which the torque acts on each gear are the same as those

described in “During Low Load and Constant-speed Cruising”.

Condition of power split planetary gear unit

(F): During Deceleration Driving

Deceleration in “D” Range

• While the vehicle is decelerated with the shift lever in the D position, the engine is turned OFF and the

motive force changes to zero. At this time, the wheels drive MG2, causing MG2 to operate as a generator,

charging the HV batteries.

• If the vehicle decelerates from a higher speed, the engine maintains a predetermined speed without stop-

ping, in order to protect the planetary gear unit.

• During deceleration, the ring gear is rotated by the rear wheels. Under this condition, due to the engine being

inactive, the rotational speed of the carrier is 0 rpm. In addition, since MG1 does not generate any torque, no

JMCIA0048GB

Sun Gear (MG1)

Carrier (Engine)

Ring Gear (Output)

Rotational Direction

+

+

+

Torque Condition

-

+

+

JMCIA0049GB

HBC-24

< FUNCTION DIAGNOSIS >

HYBRID CONTROL SYSTEM

torque acts on the sun gear. However, the sun gear (MG1) rotates freely in the (-) direction balancing the

rotating ring gear (Output).

Condition of power split planetary gear unit

(G): During Reverse Driving

• When the vehicle is being driven in reverse, the required power is supplied by MG2. At this time, MG2

rotates in the opposite direction, the engine remains stopped, and MG1 rotates in the normal direction with-

out generating any electricity.

• During reverse driving, when any of the SOC condition, battery temperature, engine coolant temperature

and electrical load condition reaches a specified level, the engine may start. The following illustration repre-

sents the condition when the engine is not driving.

• The conditions of the planetary gear are opposite to those described in “Starting and Driving with MG2”.

JMCIA0044GB

Sun Gear (MG1)

Carrier (Engine)

Ring Gear (Output)

Rotational Direction

-

0

+

Torque  Condition

0

0

0

JMCIA0043GB