Peterbilt Motors Model 320 Hydraulic Launch Assist

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Peterbilt MotorsModel 320 Hydraulic Launch Assist
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Natural Gas Benefits

• Good near term solution for lower emissions, but
  for only a couple years (2010)
• Landfills have the ability to produce own fuel
• Reduces demand for foreign oil

Peterbilt / Cummins Westport LNG Trucks
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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
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Emissions Reduction
Particulates (g/kWh)
By 2010 Diesel Engines will be as clean as
natural gas
1991
1994
1998
2002
2007
2010
NOX (g/kWh)
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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

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How does the HLA System work?
Regeneration Mode During braking, the vehicles
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.
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Hydraulic Launch System
Reservoir
Pump/Motor
Transfer case
380 Horsepower
2550 Ft-lbs Torque
Drive shaft Coupling
Filter
High-pressure accumulator
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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

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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)