SAE J381-2020 PDF

Scope: This SAE Recommended Practice establishes uniform test procedures for the defrosting systems of enclosed cab trucks@ buses@ and multipurpose vehicles. It is limited to tests that can be conducted on uniform test equipment in commercially available laboratory facilities. Current engineering practice prescribes that for laboratory evaluation of defroster systems and ice coating of know thickness be applied to the windshield to provide more uniform and repeatable test results@ even though under actual conditions such a coating would necessarily be scraped off before driving. The test condition@ therefore@ represents a more severe condition than the actual condition@ where the defroster system must merely be capable of maintaining a cleared viewing area. Because of the special nature of operation of most of these vehicles ( where vehicles are generally warned up before or garaged in preparation for road operations) and since defrosting under steady state@ over-the-road operation is the main concern@ test conditions have been adopted which eliminate the engine warmup phase of vehicle operation. This recommended practice will be reviewed and revised as technological progress in vehicle defroster test procedure requires.

SAE J381-2020 history

2020 SAE J381-2020 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE - TRUCKS@ BUSES@ AND MULTIPURPOSE VEHICLES
2009 SAE J381-2009 Windshield Defrosting Systems Test Procedure and Performance Requirements Trucks, Buses, and Multipurpose Vehicles
2000 SAE J381-2000 (R) Windshield Defrosting Systems Test Procedure and Performance Requirements - Trucks, Buses, and Multipurpose Vehicles
1994 SAE J381-1994 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE—TRUCKS, BUSES, AND MULTIPURPOSE VEHICLES
1984 SAE J381-1984 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE - TRUCKS@ BUSES@ AND MULTIPURPOSE VEHICLES
1974 SAE J381-1974 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE—TRUCKS, BUSES, AND MULTIPURPOSE VEHICLES
1968 SAE J381-1968 Windshield Defrosting Systems Test Procedure - Trucks@ Buses@ and Multipurpose Vehicles