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TRANSMIS
SION
SYSTEM
OF
HEV
By – Vaibhav Anil
Wani
INTRODUCTION
• The vehicle transmission regulates the transfer of power (torque and speed) from the
power plant (prime mover) to the driveline and the wheels. In the case of hybrid
vehicles, the transmission becomes even more complex than in conventional or electric
vehicles with two or more prime movers (inputs) and an output to the driveline/wheels.
• It consists of a power plant (IC engine), drivetrain (transmission, final drive, differential,
driveshaft), and drive wheels.
• The transmission system plays a central role in determining the tractive force and the
fuel consumption and energy regulation in the overall system.
2
CHARACTERI
STICS OF
TRANSMISSI
ON
The transmission basically
consists of a gearbox (set of gear
trains with different gear ratios)
and a power interruption device
(clutch mechanism) that can be
actuated mechanically,
electrically, or hydraulically. The
transmission requirements of a
vehicle depend on the
characteristics of the power plant
and the performance
requirements of the vehicle.
Dedicated hybrid transmission
(DHT) refers to purpose-built, full-
hybrid transmissions that are
introduced as the transmission
system for electric/ IC engine
3
MANUAL GEAR
TRANSMISSION
4
A manual gear transmission (MT) consists of a
clutch, a gearbox, a final drive, and a
driveshaft. The final drive has a constant gear
ratio. Manual and automated manual and
dual-clutch transmissions generally use a
layshaft (or countershaft) design gearbox
transmission, schematically for a typical five-
speed MT gearbox, where all the gears,
including reverse, use synchronizers. The
friction clutch in an MT enables the gradual
establishment and interruption of power flow
from the engine to the gearbox, and it controls
the engagement of the gearbox to the engine
flywheel. The power enters the gearbox and
transfers to the layshaft through the selected
meshed gears to the output shaft of the
transmission.
AUTOMATIC GEAR
TRANSMISSION
5
This type of transmission can
automatically change gear ratios
without any manual input from the
driver. It can be broadly divided into a
conventional automatic transmission
(CAT) or hydrodynamic automatic
transmission, automated manual
transmission (AMT) and dual-clutch
transmission (DCT), continuously
variable transmission (CVT), infinitely
variable transmissions (IVT), and
dedicated hybrid transmission (DHT).
CONTINUOUSLY VARIABLE
TRANSMISSION
6
A CVT has a gear ratio that can be varied
continuously within a certain range, thus
providing an infinite number of gears. The
continuous variation makes it possible to
match virtually any engine speed and torque to
any wheel speed and torque. It is, therefore,
possible to achieve an ideal torque–speed
profile (constant power profile). The design has
been improved using metallic belts that provide
better solidity and improved contact.
Furthermore, an interesting concept has been
developed and is being used by Nissan. This
concept uses three friction gears: one is
connected to the engine shaft, another to the
output shaft, and the third grips on the
particular profile of the other two gears.
INFINITELY VARIABLE
TRANSMISSION
7
The IVT provides the full range of forward
and reverse speeds, as well as neutral
gearing continuously without the need for
a clutch or torque converter. It is a split-
path design CVT that can provide
unlimited transmission gear ratio span
without any need for a clutch or torque
converter using a device called a
“variator.” The IVT has two power transfer
paths in parallel between the input and
the output, and it transfers the minimum
energy through one of the paths that
contains the variator. The main path
controls most of the energy transfer from
input to output.
DEDICATED HYBRID
TRANSMISSION
8
By integrating an electric motor and a
generator in the transmission system and
using planetary gear sets, the power from
the electric motor and an IC engine could
be combined to provide a hybrid
transmission system capable of operating in
different drive modes. For example, the
DHT enables the IC engine to drive the
vehicle in combination with an electric
motor or drive the generator and charge the
batteries. The Toyota Prius transmission is
one of the earliest developed DHT
concepts.
TRANSMISSION
IMPROVEMENT The Series - Parallel HEV system could be
considered as an electric CVT between the engine
and wheels.
1.
Recall that the Fuel Consumption value of an SP HEV with
transmission is 4.06 L/100 km, and that of a P2 HEV with
transmission is 4.09 L/100 km.
2.
9
Note that the Parallel HEV system is constructed with fewer components, that is,
engine, motor, and transmission.
3.
“CONCLUSION
”
Development trends of HEV transmissions
based on this new function were predicted, that
is, that fewer gears will be used in HEV
transmissions, but the gear ratios will be
optimized. This conclusion is based on several
HEV models, an energy management strategy
considering total efficiency, and an engine
working point distribution analysis.
THANK
YOU!

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Transmission system of HEV

  • 2. INTRODUCTION • The vehicle transmission regulates the transfer of power (torque and speed) from the power plant (prime mover) to the driveline and the wheels. In the case of hybrid vehicles, the transmission becomes even more complex than in conventional or electric vehicles with two or more prime movers (inputs) and an output to the driveline/wheels. • It consists of a power plant (IC engine), drivetrain (transmission, final drive, differential, driveshaft), and drive wheels. • The transmission system plays a central role in determining the tractive force and the fuel consumption and energy regulation in the overall system. 2
  • 3. CHARACTERI STICS OF TRANSMISSI ON The transmission basically consists of a gearbox (set of gear trains with different gear ratios) and a power interruption device (clutch mechanism) that can be actuated mechanically, electrically, or hydraulically. The transmission requirements of a vehicle depend on the characteristics of the power plant and the performance requirements of the vehicle. Dedicated hybrid transmission (DHT) refers to purpose-built, full- hybrid transmissions that are introduced as the transmission system for electric/ IC engine 3
  • 4. MANUAL GEAR TRANSMISSION 4 A manual gear transmission (MT) consists of a clutch, a gearbox, a final drive, and a driveshaft. The final drive has a constant gear ratio. Manual and automated manual and dual-clutch transmissions generally use a layshaft (or countershaft) design gearbox transmission, schematically for a typical five- speed MT gearbox, where all the gears, including reverse, use synchronizers. The friction clutch in an MT enables the gradual establishment and interruption of power flow from the engine to the gearbox, and it controls the engagement of the gearbox to the engine flywheel. The power enters the gearbox and transfers to the layshaft through the selected meshed gears to the output shaft of the transmission.
  • 5. AUTOMATIC GEAR TRANSMISSION 5 This type of transmission can automatically change gear ratios without any manual input from the driver. It can be broadly divided into a conventional automatic transmission (CAT) or hydrodynamic automatic transmission, automated manual transmission (AMT) and dual-clutch transmission (DCT), continuously variable transmission (CVT), infinitely variable transmissions (IVT), and dedicated hybrid transmission (DHT).
  • 6. CONTINUOUSLY VARIABLE TRANSMISSION 6 A CVT has a gear ratio that can be varied continuously within a certain range, thus providing an infinite number of gears. The continuous variation makes it possible to match virtually any engine speed and torque to any wheel speed and torque. It is, therefore, possible to achieve an ideal torque–speed profile (constant power profile). The design has been improved using metallic belts that provide better solidity and improved contact. Furthermore, an interesting concept has been developed and is being used by Nissan. This concept uses three friction gears: one is connected to the engine shaft, another to the output shaft, and the third grips on the particular profile of the other two gears.
  • 7. INFINITELY VARIABLE TRANSMISSION 7 The IVT provides the full range of forward and reverse speeds, as well as neutral gearing continuously without the need for a clutch or torque converter. It is a split- path design CVT that can provide unlimited transmission gear ratio span without any need for a clutch or torque converter using a device called a “variator.” The IVT has two power transfer paths in parallel between the input and the output, and it transfers the minimum energy through one of the paths that contains the variator. The main path controls most of the energy transfer from input to output.
  • 8. DEDICATED HYBRID TRANSMISSION 8 By integrating an electric motor and a generator in the transmission system and using planetary gear sets, the power from the electric motor and an IC engine could be combined to provide a hybrid transmission system capable of operating in different drive modes. For example, the DHT enables the IC engine to drive the vehicle in combination with an electric motor or drive the generator and charge the batteries. The Toyota Prius transmission is one of the earliest developed DHT concepts.
  • 9. TRANSMISSION IMPROVEMENT The Series - Parallel HEV system could be considered as an electric CVT between the engine and wheels. 1. Recall that the Fuel Consumption value of an SP HEV with transmission is 4.06 L/100 km, and that of a P2 HEV with transmission is 4.09 L/100 km. 2. 9 Note that the Parallel HEV system is constructed with fewer components, that is, engine, motor, and transmission. 3.
  • 10. “CONCLUSION ” Development trends of HEV transmissions based on this new function were predicted, that is, that fewer gears will be used in HEV transmissions, but the gear ratios will be optimized. This conclusion is based on several HEV models, an energy management strategy considering total efficiency, and an engine working point distribution analysis.