cummins motor coach gearing recommendations 2015-2016 on-highway us and canada (epa) products
DESCRIPTION
Application Guidelines Terminology Startability –The maximum grade (%) on which a vehicle could accelerate from rest during an idle away (closed throttle) start Peak Torque Gradeability –The maximum grade that a vehicle could ascend while operating at 100 % throttle in top gear at peak torque rpm Cruise Gradeability –The maximum grade that a vehicle could ascend at a specified cruise speed while operating in top gear at 100 % throttleTRANSCRIPT
Cummins Motor Coach Gearing Recommendations
2015-2016 On-Highway US and Canada (EPA) Products
What matters? Vehicle Mission Electronic Engine Features
and Parameters Gearing Understanding the customer’s
equipment and duty cycle
Application Guidelines Terminology Startability
– The maximum grade (%) on which a vehicle could accelerate from rest during an idle away (closed throttle) start
Peak Torque Gradeability– The maximum grade that a vehicle could ascend while operating
at 100 % throttle in top gear at peak torque rpm
Cruise Gradeability– The maximum grade that a vehicle could ascend at a specified
cruise speed while operating in top gear at 100 % throttle
Guidance for New Equipment Replacement Equipment
– Existing equipment should dictate “Minimum Performance Requirements”
– If tradeoffs are expected, provide customer with adequate explanation and obtain their buy-in
– Driveability (Driver Satisfaction)• Startability• Torque Peak Gradeability• Cruise Gradeability
– Total Cost of Ownership (Owner Satisfaction)• Operational Efficiency and Fuel Economy• Maintenance
Cummins Gearing Recommendations
Gearing Criteria:– Max Fuel Economy:
Aim to maintain the engine operating in a low rpms range, producing adequate power to accomplish the job in an efficient manner, This favors fuel economy over some performance characteristics (i.e. increase in shifting).
– Balance:Aim to operate the engine in a rpm range where horsepower is increasing while peak torque is readily available. This is a good compromise for customers seeking decent fuel economy with solid performance characteristics.
6
Motorcoach Ratings385-500 HP
7
Motorcoach Ratings330-380 HP
8
Motorcoach Rating400 HP
9
Motorcoach Rating320 HP