Transcript Hybrid Road Map

Peterbilt Motors
Model 320 Hydraulic
Launch Assist
Natural Gas Benefits
• Good near term solution for lower
emissions, but for only a couple years
(2010)
• Landfill’s have the ability to produce own
fuel
• Reduces demand for foreign oil
Peterbilt / Cummins
Westport LNG Trucks
Natural Gas Challenges
• Lower energy density requires numerous
CNG or expensive LNG tanks
• Lower acceleration vs. horsepower
• Extensive infrastructure for delivery
• Special provisions for servicing
• Higher initial procurement and
maintenance cost
LNG Refueling
Station
Emissions Reduction
Particulates (g/kWh)
By 2010 Diesel Engines will
be as clean as natural gas
0.4
0.35
1991
0.3
0.25
0.2
0.15
2002
0.1
1998
1994
0.05
2010 2007
0
0
1
2
3
4
NOX (g/kWh)
5
6
7
HLA Benefits
• Reduces emissions by launching the
vehicle using pure hydraulic or blended
power
• Regenerative braking reduces brake wear
– Lower maintenance cost
– Reduces particulate matter emissions
from brake dust.
• Improved fuel economy reduces demand
for foreign oil
• Technology and trucks developed in
Denton, Texas
How does the HLA System work?
Regeneration Mode
During braking, the vehicle’s kinetic
energy drives the pump/motor as a pump,
transferring hydraulic fluid from the low
pressure reservoir to the high pressure
accumulator. The fluid compresses
nitrogen gas in the accumulator and
pressurizes the system.
Launch Assist Mode
During acceleration, fluid in the high
pressure accumulator is metered out to
drive the pump/motor as a motor. The
system propels the vehicle by
transmitting torque to the driveshaft.
Hydraulic Launch System
Reservoir
Pump/Motor
380 Horsepower
Transfer case
Drive shaft
Coupling
2550 Ft-lbs Torque
Filter
High-pressure
accumulator
Test Data
• Peterbilt 320 chassis
• 63,000lb ( 28.5 Tonne ) GVW
• CAT C-10 315 hp engine
• Allison 4560 5-speed automatic transmission
• 100 feet ( 30 metres ) between stops
• ABS braking system
Fleet Trial
• Houston Advanced Research Center
• 12 Truck Fleet Evaluation
• Customers
– Waste Management (4)
– City of Houston (2)
– City of Denver, CO (1)
– City of Dallas (4)
– City of Denton (1)