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Commercial Truck and Bus SAE Recommended Procedure for Vehicle Performance Prediction and Charting

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2188_201807
  • Current
Published 2018-07-25 by SAE International in United States
This SAE Recommended Practice takes into account modern standardized methods for collecting and summarizing data that has an effect on vehicle steady-state performance, such as engine output (gross and net), transmission losses, drivetrain efficiency, vehicle aerodynamic devices for various vehicle and body configurations, as well as road surface variations and air density variations resulting from altitude and barometric effects. The procedure does not address vehicle transient performance (acceleration, braking, and cornering), because of the considerable amount of additional data required such as moment of inertia of all the rotating parts. Nor does it address vehicles with torque converters and automatic transmissions. This document is, therefore, intended for vehicles having fixed-ratio type transmissions and positive engagement clutches. Metric and ISO unit conversions are provided in the metric conversion tables at the end of this procedure (see Appendix B). Some modern vehicles with electronic engine controls have the ability to vary the maximum engine revolutions for each gear, as well as permitting the power or rpm to increase if more time is spent in the lower gears,…
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Recommended Practice for Measuring Fuel Economy and Emissions of Hybrid-Electric and Conventional Heavy-Duty Vehicles

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2711_201807
  • Current
Published 2018-07-23 by SAE International in United States
This SAE Recommended Practice was established to provide an accurate, uniform and reproducible procedure for simulating use of heavy-duty hybrid-electric vehicles (HEVs) and conventional vehicles on dynamometers for the purpose of measuring emissions and fuel economy. Although the recommended practice can be applied using any driving cycle, the practice recommends three cycles: the Manhattan cycle, representing low-speed transit bus operation; the Orange County Transit Cycle, representing intermediate-speed bus operation; and the Urban Dynamometer Driving Schedule (UDDS) cycle representing high-speed operation for buses and tractor-trailers. This document does not specify which emissions constituents to measure (e.g., HC, CO, NOx, PM, CO2), as that decision will depend on the objectives of the tester. While the recommended practice was developed specifically to address the issue of measuring fuel economy and emissions for hybrid-electric heavy-duty vehicles on a chassis dynamometer, the document can also be applied to chassis testing of other heavy-duty vehicles. This document builds upon SAE J1711, the light-duty HEV chassis recommended practice. As in SAE J1711, this document defines a hybrid vehicle as having both a…
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Snap-Acceleration Smoke Test Procedure for Heavy-Duty Diesel Powered Vehicles

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J1667_201802
  • Current
Published 2018-02-15 by SAE International in United States
This SAE Recommended Practice applies to vehicle exhaust smoke measurements made using the Snap-Acceleration test procedure. Because this is a non-moving vehicle test, this test can be conducted along the roadside, in a truck depot, a vehicle repair facility, or other test facilities. The test is intended to be used on heavy-duty trucks and buses powered by diesel engines. It is designed to be used in conjunction with smokemeters using the light extinction principle of smoke measurement. This procedure describes how the snap-acceleration test is to be performed. It also gives specifications for the smokemeter and other test instrumentation and describes the algorithm for the measurement and quantification of the exhaust smoke produced during the test. Included are discussions of factors which influence snap-acceleration test results and methods to correct for these conditions. Unless otherwise noted, these correction methodologies are to be considered an integral part of the snap-acceleration test procedure.
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Liquefied Natural Gas (LNG) Vehicle Metering and Dispensing Systems - Truck and Bus

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2645_201802
  • Current
Published 2018-02-12 by SAE International in United States
This SAE Recommended Practice applies to Liquefied Natural Gas Vehicle Fuel. The purpose of this document is to provide information on issues that are important to consider regarding LNG metering and dispensing systems.
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Recommended Practice for LNG Medium and Heavy-Duty Powered Vehicles

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2343_201802
  • Current
Published 2018-02-12 by SAE International in United States
This SAE Recommended Practice provides guidance for the construction, operation, and maintenance of LNG powered medium, heavy-duty vehicles and all LNG vehicles used for public transit or commercial applications.
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Liquefied Natural Gas (LNG) Vehicle Fuel

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2699_201802
  • Current
Published 2018-02-12 by SAE International in United States
This SAE Information Report applies to liquefied natural gas used as vehicle fuel and requires LNG producers to provide the required information on the fuel composition and its “dispense by” date.
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Recommended Practices for CNG Powered Medium and Heavy-Duty Trucks

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2406_201802
  • Current
Published 2018-02-12 by SAE International in United States
This SAE Recommended Practice provides guidance for the construction, operation, and maintenance of CNG powered medium and heavy-duty trucks. The intent of this document is to cover TRUCKS (6350 kg (14 001 gvw pounds) and above) and specifically excludes passenger vehicles such as: buses, recreational vehicles, motor homes and/or passenger vehicles which may incorporate a truck chassis in their construction.
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Clutch Requirements for High-Torque Truck and Bus Engines

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2408_201801
  • Current
Published 2018-01-18 by SAE International in United States

Although not limited to, these clutch requirements are normally used on trucks considered as Heavy Duty (Class 8). This SAE Information Report defines and discusses clutch and related component configurations which will become the subject of future SAE Recommended Practices to promote standardization of clutch installations and mounting dimensions for use with pull-type heavy-duty clutches.

Openings for Six- and Eight-Bolt Truck Transmission Mounted Power Take-Offs

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J704_201711
  • Current
Published 2017-11-03 by SAE International in United States
The accompanying mounting and gear locations are applicable for all general installations of power take-off on the transmission gear box of motor trucks and tractors where the size of the transmission permits. The heavy-duty type opening can be adapted to the regular-duty type by the use of an adapter with 6.35 mm (0.25 in) flange thickness with appropriate bolt pattern and thread engagement. (See Figures 1 and 2.)
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Clutch Installation and Release Linkage Requirements for Truck and Bus Application

Truck and Bus Powertrain Committee
  • Ground Vehicle Standard
  • J2407_201711
  • Current
Published 2017-11-03 by SAE International in United States
Although not limited to, these installations are normally used on trucks considered as Medium Duty (Class 6 and 7), as well as Heavy Duty (Class 8).
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