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This paper presents the rationale and underlying logic for automatic transmission filtration contaminant control (ATFCC). This approach relies upon an integrated filtration system as opposed to simply sandwiching in a piece of filter media or metal screen in the traditional transmission oil sump area. Most significantly, quantitative filtration system design and specification will result from implementation of a thorough ATFCC approach. A new transmission filter test procedure is also presented which closely represents the field operation of these types of filters. Test results are presented which compare the new test procedures results' with more traditional Multipass Filter test results.

The focus of this paper is the interpretation and application of the Multipass Filter test- more commonly known as the Beta test for determining a filters (or medias) Beta Rating. A specific Beta test report is deserved and analyzed. A review of the required test equipment for conducting a Multipass test is provided and many test operating conditions are described. The Beta Rating definition and detailed points for conducting a Beta test are also given.

The understanding of a filter's performance is often not only confusing but misleading. Automotive filters, for this discussion referring to engine lubrication filters, transmission fluid filters, and fuel filters, are no exception. Advanced filtration assessment techniques have been finding increasing use and application in many filter specifications for OEM and aftermarket use. This paper addresses the application of laboratory filter assessment methods to filter specification requirements. The component or system designer and user that must rely upon a filter for protection is often left with little or no direction to help understand a filters characteristics. Worse yet, many of the more common techniques for testing (and thus describing) filtration characteristics are misleading because they are totally unrelated to a filters application. A presentation of currently used filter test methods and newer, more applicable tests are discussed.

This paper details an extensive study that was performed to define, quantify, and describe the contaminant found in automotive type transmissions. The results from the study were used to manufacture a new commercially available test contaminant that simulates the contaminant found in high mileage transmissions. The study was undertaken because no commercially available contaminant existed to test transmission related components, especially valves, pumps and filters. Most accepted test contaminants such as AC Fine or Course Test Dust were known not to give representative contaminant related results. The study consisted of collecting 29 oil samples from various mileage vehicles. The particle size distribution, gravimetric level, and chemical composition were found from the samples.