SAE J2807:2020 free download

05-25-2021 comment

SAE J2807:2020 download free.Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating.
RATIONALE
Some of the tires specified in Table 1 have been discontinued and are no longer available. Specifying steering wheel angle gradient as an alternative to understeer gradient eliminates the need to measure the steering ratio and makes it easier to deal with systems that modify the front wheel angle relative to the steering wheel angle and vehicles that steer the rear wheels. There is now a minimum temperature specification for the sway damping test since lower temperatures increase sway damping. The maximum equivalent tongue length (ETL) for trailer K has been corrected.
FOREWORD
Light truck, minivan, sport utility, and crossover vehicles represent a significant portion of the North American vehicle mix, and trailering usage of these vehicles has increased. Heavier duty models, approaching medium-duty trucks and often intended for trailering, have become more popular as well. Some passenger cars are also rated to tow trailers. For many vehicles, trailer weight rating may be a major marketing point.
As trailer weight ratings have increased, engine characteristics like horsepower and torque. thermal performance, and driveline durability are no longer the only significant factors in determining trailering capability. Combination vehic’e ctynamics and tow-vehicle hitchiattachment structure have gained in significance.
SAE J2807 defines procedures and requirements to determine gross combination weight rating (GCWR) and calculate corresponding trailer weight rating (TWR) for any tow-vehicle. These procedures will establish consistent rating requirements and processes so end users (customers) can reasonably compare similar class models in terms of trailering ability.
1. SCOPE
SAE J2807 establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle
TWR for passenger cars, multipurpose passenger vehides. and trucks. This includes all vehicles up to 14000 pounds GVWR.
1.1 Purpose
SAE J2807 establishes tow-vehicle performance requirements for combination vehicle acceleration, gradeability, understeer, trailer sway response, braking and park brake at GCWR, and tow-vehicle hitchlattachment structure at TWR. In order to minimize test variations, it provides standard test trailer specifications and requirements for use in these tests. It is acknowledged that there are a wide variety of conditions experienced while trailering which cannot be completely addressed within this document and in no way is this document intended to establish or limit manufacturers’ designs or instructions to the customer. This document provides equations to determine TWR from GCWR in conjunction with other vehicle ratings and defined vehicle weight conditions and dimensions. Vehicles rated under this document are subject to normal production variation and it is intended that most vehicles of a specific model that is marketed as meeting SAE Recommended Practice J2807 shall meet the performance requirements in this standard.
As a secondary purpose, this document may be used as a benchmark to qualify the performance of a specific trailer design. The tow vehicle and trailer setup criteria should follow the trailer manufacturers’ specifications when used for this purpose and may differ from the setup criteria required by the sections below.
2. REFERENCES
2.1 Applicable Documents
The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply.
3. DEFINITIONS
3.1 CONVENTIONAL TRAILER
A semi-trailer with a coupling device designed to attach to the rear of the tow-vehicle. SAE J2807 include Fifth wheel or gooseneck trailers.
3.2 TOW-VEHICLE TRAILERING WEIGHT (TVTW)
3.2.1 Tow-Vehicles Under 8500 pounds GVWR
TVTW is the weight of the tow-vehicle used for EPA emissions and fuel economy certification including all options in excess of 33% sales penetration plus one 68.0 kg (150 pound) driver and one 68.0 kg (150 pound) front seat passenger, plus the tow-vehicle manufacturer’s available trailering package andlor any required trailering content (if not included in the 33% option penetration weight) plus representative aftermarket trailering equipment as specified in 5.2. In the case where a trailering package is not available from the tow-vehicle manufacturer or it does not include a trailer hitch component, the representative aftermarket trailenrig equipment as specified in 5.2 shall include a trailer hitch component.
32.2 Tow-Vehicles at 8500 pounds 01 Greater GVWR
TVTW is base vehicle curb weight plus one 68.0 kg (150 pound) driver and one 68.0 kg (150 pound) front seat passenger plus 45.4 kg (100 pounds) of optional equipment split evenly between front and rear axles plus the tow-vehicle manufacturers available trallering package and/or any required tradenng content and representative aflermarket trallerrig equipment as specified in 52 In the case where a traaenng package is not available frcsvi the tow-vehicle manufacturer or it does not Include a trailer hitch component, the representative aflermadiet trallering equipment as specified in 52 shall Include a trader hitch component.
3.2.3 Incomplete Tow-Vehicles Requving Final Stage Manufacturer Completion
ivrw is base rncompete vehicle curb weight plus one 68.0 kg (150 pound) cklver and one 68.0 kg (150 pound) front seal passenger plus 45.4 kg (100 pounds) of optional equipment spat evenly between front and rear axles plus 119.1 kgfln (80 ttft) for body completion from the rear surface of the cab to the rear end of the frame rail (or reermost edge of incomplete vehele structure), plus the tow-vehicle manufacturers avadehle tralleflng package and/or any required trallering content and representative altemiarket tradering equipment as specified in 5.2. In the case where a trallenng package is not avadable from the tow-vehicle manufacturer or It does not include a trailer hitch component, the repi’esentatwe aflermarket trailenng equipment as specified m 5.2 shall include a trailer hitch component.
3.2.4 Tow-Vehicles Completed by Final Stage Manufacturers
1VTW is that for an incomplete vehicle as defined in 3.2.3 except thai the body completion weight shall equal the base weight of the body style of the manufacturers body cornplef Ion. The exception to this Is that a molorhome body completion shad Include 2268kg (500 pounds) of optional equipment split evenly between front and rear axles pkis the base weight of the moloittome ca’nplelion
3.3 TRAILER WEIGHT RATING (‘tWR)
TWR is the rated value for the maximum allowable weight of a loaded trailer for a specific tow-vehicle model arid hitch type, as determined by the law-vehicle manufacturer. A specific tow-vehicle may have multiple TWRs for weight carrying hitch, weight distributing hitch, fifth wheel hitch, andior gooseneck hItch. For vehicles that can aieo pull a fifth wheel or gooseneck, the conventional, fifth wheel, and gooseneck ratings shall be clearly Idenufled A tow-vehicle may also have a TWR for an unbraked trailer,
3.4 TRAILER ROTATION RADIUS RAT)O (RRR)
RRR is the yaw radius of gyration divided by effective tongue lenh (EU).
35 EFFECTIVE TONGUE LENGTH (Eli,)
ETL is the longitudinal distance tram the canter of the trailer coupler ball socket to the center of the trailer wheel(s).
3.6 FRONT AXLE LOAD RESTORATION (FALR)
FALR Is the change In front axle load due to weight distributing hitch appitcation divided by change In front axle load due to addition of trailer tongue weight. expressed in percent.
This section provides specifications and/or requirements for standard trailers, trailer hitch equipment, and combination vehicle connections. It also provides performance requirements for tow-vehicle structure, propulsion system performance, and combination vehicle handling and braking. Tow-vehicle GCWR is qualified by conformance to the performance requirements following in this section. Should the tow-vehicle be capable of different GCWR values throughout the various tests in this section, the actual GCWR will be the least of the values attained. The performance requirements of this document are not intended to be used to establish minimum acceptable values for various aspects of trailering. The performance requirements and metrics specified in this document are selected considering carefully controlled specific trailers, combination load conditions, and driving maneuvers to provide for objective comparisons of tow-vehicle performance. The full range of acceptable trailer loading conditions, trailer types, and driving maneuvers to be experienced by actual customers may produce some lower performance values that remain in the range of acceptability. There is nothing in this document that precludes the use of analytical methods to confirm conformance to requirements. It is presumed that analytical methods, when used, should produce results that are equivalent to physical test results. Physical test results, when available, supersede analytical method results.
4.1 Standard Trailer
This section defines representative “standard” trailers, connections and ballast conditions for test purposes. This is not intended to define “worst-case” trailer loading or specifications, or to establish limits in trailer types that can be towed. The frontal area consideration is required only for propulsion system testing; effective tongue length consideration is required only for dynamics testing. Trailers to be used for dynamics purposes should be equipped with limited optional equipment in order to minimize trailer weight and maximize ballast flexibility. Additional trailer, hitch connection, and ballast requirements for testing various performance attributes (propulsion, handling, and braking) may be found in those specific sections. The frontal area requirements account for entire trailer frontal silhouette to the ground plane.

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