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SAE J1489_200005

Name: SAE J1489_200005 PDF | Request Standard
SKU: a382ba7d3cbc

Heavy Truck and Bus Retarder Downhill Performance Mapping Procedure

Standard by SAE International, 2000-05-01

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SAE J1489_200005.PDFSecure PDF
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Language: English
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About This Item

The procedure covers the estimation of the total retardation capability available to a specific vehicle from: a Natural retardation (rolling resistance, aerodynamic drag, etc). b Engine drag c Engine, integral automatic transmission, driveline or trailer-axle retarders It assumes that foundation brakes are not used for maintaining speed on long mountain descents. Retardation is rated in terms of the maximum grades on which stable control speeds can be maintained for each gear over the range of highway speeds appropriate to that gear. For each gear, the calculation procedure determines maximum grades for at least four values of control speed ranging from the vehicle velocity corresponding to full load governed engine rpm, to the vehicle velocity corresponding to the engine rpm at minimum (idle) speed. In addition, the calculation procedure provides information on the total retarding power available for each gear. Changes to this document include: 1 Editorial changes to comply with the SAE Technical Standards Board format. Metric was included in this version of the document. 2 The Scope changed to Section 1. Purposed changed to 1.1 and References were added.

SKU: a382ba7d3cbc

Publication Date: 2000-05-01

Standard Status: latest

Publisher: SAE International

Document Type: Ground Vehicle Standard

Subject: Buses, Recreational vehicles and equipment, Automatic transmissions, Transmission gears, Heavy trucks, Axles, Trucks, ,

Official SAE: Doi link

This Version: J1489_200005 (2000-05-01)

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