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原文传递 Tire Pressure Monitoring System Tests for Medium and Heavy Trucks and Buses.

题名：	Tire Pressure Monitoring System Tests for Medium and Heavy Trucks and Buses.
作者：	Grygier-P.A.; Daniel-S.; Hoover-R.L.; Van Buskirk-T.R.
关键词：	Heavy-vehicles; Tire-Pressure-Monitoring-Systems.;Inflation-pressure; Installation-; Operation-; Temperature-compensation; Low-pressure-warning.
摘要：	Tire Pressure Monitoring Systems (TPMS) are an aid to maintaining proper inflation pressure. TPMS for heavy vehicles, when compared to systems developed for vehicles with a Gross Vehicle Weight Ratings (GVWR) less than 10,000 pounds, must monitor tires that operate at significantly higher pressures and also monitor more tires. This report examines the development of a procedure that can be used to check the operation of TPMS on vehicles with GVWRs greater than 10,000 pounds, up to 80,000 pounds. This study examined the operation of five aftermarket TPMS on two different heavy vehicles. The installation and operation of each system are described. It was conducted in two parts. It first examined the application of temperature compensation to low pressure detection test levels after initializing the TPMS with a hot calibration procedure. Then it compared data using uncompensated test pressure following a cool calibration procedure. The data results have shown that type or brand of vehicle did not alter the individual TPMS results. The results for a given TPMS on a 10-tire truck were repeated when later installed on a 10-tire tractor, without observing any vehicle influence on the test results even though the vehicles were equipped with different tires, rims, and the TPMS were adjusted to different recommended Cold Inflation Pressures (CIP). By using a cool calibration procedure to initialize the TPMS before performing a low pressure detection test, the tires remained relatively cool, and therefore did not thermally bias the basic low pressure detection capability of each system. By adding tire temperature compensation to the TPMS, the variation between a hot over-the-road tire pressure reading and low-pressure alerts for both 10 and 20 percent pressure losses was maintained at tire temperatures elevated to nearly 30DGF above initial CIP temperatures. It maintained a fixed ratio of pressure drop from current temperature operating pressures to activate the low-pressure alarm, where the systems without temperature compensation allowed much larger pressure drops before activating their alarms.
报告类型：	科技报告