Extended HEV Systems, Grzegorz Płuciennik, Mechanika Samochodowa, Hybrydowy Napęd
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Online Learning cours
and Complimentary
Webinars are now
available!
Extended HEV Systems Tip of the Month!
Yes.....it's winter, again. This means ice, snow, and the cold weather in
many places in the world that brings the joys and frustrations of the
winter season. This also means that the 12 volt auxiliary battery in
your hybrid vehicle must be in top condition for the winter months. As a
reminder, the 12 volt battery may (or may not) crank the engine but, it
still needs to be in top condition to power all of the vehicle control
modules. In the vehicles that do not use a 12 volt cranking motor, the
12 volt battery provides power to the hybrid and motor controllers that
are used to energize/control the high voltage electric machines that
crank the engine. Therefore, no 12 volt battery means no controllers
power and no motor to crank the engine. Ensure that the hybrid 12 volt
battery ready to go for the winter to keep the hybrids cranking!!
Click
HERE
to view our
Complimentary Webinar
catalog
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to view our On
Learning catalog
Introduction to GM 2-Mode Hybrid System
Conclusion - Part 3 for this Series
Diagnosing Hybrid Vehi
Electric Machine
(Transmission) Failures (P
of 3-Part Series)
Have you read parts 1 and 2 of this series? If you would like to refer back, you can download the
PDF's of the
November
(Part 2) and
October
(Part 1) eNewsletters.
Our next Complimenta
Webinar is on JANUARY 1
2012. Click on the butt
above to register!
Part 1 of this topic series (ref: Oct 2011 Newsletter) we covered the following aspects of the GM 2-Mode
Hybrid System:
Did you miss this series?
will be re-running all three
again later in Spring 2012.
on the webinar catalog abo
register!
z
Engine Cranking
z
Components
z
EVT Mode 1 Low
z
EVT Mode 2 High
z
Engine Auto-Stop and Start
z
Fixed Gear Operation
z
Regenerative Braking
___________________
Part 2 of this series (ref: Nov 2011 Newsletter) we covered the following aspects of the GM 2-Mode Hybrid
System:
z
2ML70 Transmission Specifications
z
2ML70 Transmission Overview
z
Drive Motor - First Position (Motor “A”)
z
Engine Starting
z
Regenerative Braking
z
1-3 Clutch Assembly
{
1-3 Clutch Apply
{
1-3 Clutch Release
z
4
th
Clutch Assembly
{
4
th
Clutch Apply
{
4
th
Clutch Release
Calling all technicians! W
will you be on March 12-
2012? If you answered, "A
Goodyear Tire and Serv
Academy in Orlando, Flor
you are right!
In
Part 3
of this series we will concentrate on the Drive Motor and Design, Switch Assembly,
Sensor Assembly as well as the aux fluid pump assembly.
Hosted by Napa Autotech
sponsorship and training
AR&D, technicians can tak
day HEV Systems traini
course. Click on the thumb
above for details, pricing,
special Disney packages
participants and their fami
GM 2-Mode 2ML70 Hybrid Transmission
The class is limited to onl
PARTICIPANTS!
Pre
registration
is now ope
Can't make it to Orlan
Click here to look at o
other On-Ground train
opportunities in 201
AR&D has two satellite sc
with whom we schedule
TTT courses to suppo
summer availability.
Drive Motor - Second Position (Motor “B”)
The drive (w/generator) motor assembly - 2
nd
position (see Figures 1 and 2) is located in the case
assembly, between the center support assembly and the sun gear carrier assembly - 3
rd
position,
and is splined to the sun gear shaft assembly - 3
rd
position. The drive (w/generator) motor
assembly - 2
nd
position provides power input to the transmission, in order to drive the vehicle
when the internal combustion engine is OFF (auto-stop). The drive (w/generator) motor assembly -
2
nd
position is commanded ON and driving when the transmission is in Reverse, EVT Mode Low,
and EVT Mode High.
Madison Area Technical Co
Portland Community Col
We are also have affiliati
with various venues to pro
HEV Systems Trainin
Figure 1.- Location of Motor “B”
Peninsula College
We provide you with
equipment specifically
designed to analyze an
diagnose Hybrid and Ele
Vehicle Systems. View th
HERE
!
Figure 2.- Motor B Construction
Regenerative Braking
Are you looking to
implement HEV curricu
into your class offerin
When the vehicle is coasting or braking the HPCM may operate the drive (w/generator) motor
assembly - 2
nd
position in an electrical generation mode. Operating as an electrical generator, the
drive (w/generator) motor assembly - 2
nd
position exerts a driveline load that helps to slow the
vehicle. The electrical energy that the drive (w/generator) motor assembly - 2
nd
position creates is
transferred by the drive motor generator TPIM to the drive motor generator battery assembly (high
voltage battery). Constant communication between the HPCM and the electronic brake control
module (EBCM) controls the blending of regenerative braking force with hydraulic braking force.
Click
HERE
to complete
online request form wi
American Technical Publis
to receive a
complimen
instructor review copy of
Hybrid Electric Vehicl
Technology student textb
Reverse
______________________
A planetary gear set reverses the direction of power flow rotation when the internal gear is held
stationary and power is applied to the sun gear. This causes the pinion gears to act as idler gears
and drive the carrier assembly in the opposite direction. The 2ML70 2-Mode Hybrid transmission,
however, uses the drive (w/generator) motor assembly - 2nd position to reverse direction, and a
gear set is used only to achieve reduction.- Reverse direction of rotation occurs in EVT Mode
Reverse when the drive (w/generator) motor assembly - 2nd position is commanded ON by the
hybrid control module (HCM).- The drive (w/generator) motor assembly - 2nd position drives in
the reverse direction (opposite of engine rotation), providing power to the sun gear - 3rd position
through the sun gear shaft assembly - 3rd position, and thus driving the sun gear carrier assembly -
3rd position pinion gears. With the internal gear - 3rd position held stationary by the hybrid low,
1-2 clutch assembly, the sun gear carrier assembly - 3rd position pinion gears walk around the
internal gear and drive the sun gear carrier assembly - 3rd position to provide an overall
transmission reduction ratio of approximately 3.692:1.- See Figure 3
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Figure 3.- Planetary Gear Set
Manual Shift Shaft Position Switch Assembly
The shaft position switch (manual shift shaft position switch assembly), also referred to as an
Internal Mode Switch (IMS) as shown in (Figure 4), is a dual sliding contact switch attached to the
manual shift shaft inside the transmission case. The nine outputs from the switch indicate which
position is selected by the manual shift shaft.
Figure 4.- Internal Mode Switch
Four outputs (A, B, C, P) are range selection inputs to the TCM which indicate the selected
transmission gear range. Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the
HPCM through the transmission 24-way connector. The input voltage at the modules is high when
the switch is open and low when the switch is closed to ground. The state of each input is available
for display on the scan tool as IMS Range and IMS Direction. The IMS Range input parameters
represented are transmission range signal A, signal B, signal C, and signal P (Parity). The IMS
Direction input parameters represented are transmission direction signal R1, signal R2, signal D1,
signal D2, and Signal Start.
An additional output, signal N (P/N Start), does not input the TCM, but rather goes directly to the
Engine Control Module (ECM) to determine a Park/Neutral state and allow engine start. Routing
Signal N to the ECM will allow the engine to be started with a dead TCM. Signal N is not a signal
used by the TCM for shaft position switch logic.
Automatic Transmission Output Speed (A/T OSS) Sensor Assembly
The Output Speed Sensor (OSS) assembly (see Figure 5) has two internal Hall Effect type sensors,
and is capable of sensing both speed and direction. The OSS is mounted outside the automatic
transmission rear case assembly, and is connected to the control solenoid (w/body and TCM) valve
assembly through a wire harness and connector. The sensor faces the hybrid direct, 2-3-4 clutch
housing assembly, and is triggered by machined teeth on the rear outer diameter of the housing.
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