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Technical Paper

A New Look at Swash-Plate Drive Mechanisms

The versatile, compact, and simple swash-plate drive mechanism has been adopted for a variety of applications to give a reliable method of converting reciprocating motion to rotary motion. Historically, designers have concerned themselves only with the kinematics of swash-plate drives. This paper describes an analysis which combines swash-plate drive kinematics with hydrodynamic-bearing theory so a performance evaluation of the complete mechanism can be made. The predicted operating characteristics have been verified by tests on full-size models. Operating experience has shown the properly designed swash-plate drive system is a competitive method for converting reciprocating motion into rotary motion. A comprehensive bibliography of swash-plate drive literature is included.
Technical Paper

An Analog/Digital Integrated Circuit Interface for Automotive Sensors

A unique and very versatile circuit is described which converts changes in physical parameters such as capacitance, resistance, and inductance into a proportional pulse width modulated digital signal. This circuit, in combination with sensors which utilize these physical parameters in their operation, can be used to provide digital inputs to microprocessors and other digital control and diagnostic systems. Advantages of this particular circuit are its potential for high reliability, accuracy, and low cost. Several applications are described and an integrated circuit version of the circuit is discussed.
Technical Paper

Engine Oil Phosphorus Effects on Catalytic Converter Performance in Federal Durability and High-Speed Vehicle Tests

Phosphorus derived from engine oil adversely affected catalyst performance monitored in two separate vehicle tests. In the first test, conducted using six matched vehicles operated at high-speed conditions with three different commercial engine oils, catalyst hydrocarbon conversion efficiency decreased linearly with both the amount of phosphorus added to the engine, and that found on the catalyst. In the second test, conducted using four matched vehicles operated on two different commercial engine oils using the Federal Durability Driving Cycle, hydrocarbon conversion efficiency also decreased linearly with the same phosphorus parameters. In this latter test, for nominal oil economies (3 400 km/ℓ) and phosphorus concentrations found in current oils (0.17 weight percent), catalyst deterioration due to phosphorus poisoning was greater than that due to thermal degradation and could adversely affect a vehicle's ability to pass current (1977) and future emission standards.
Technical Paper

The Durable CASS Test

The neutral salt spray as an accelerated corrosion test to predict the service performance of decorative, bright-plated automobile trim gave such unsatisfactory results that the American Electroplaters' Society sponsored development of more rapid and reliable testing methods. The Corrodkote and CASS tests were successfully developed to duplicate the extent and type of corrosion occurring on parts in one winter's service in Detroit. It is suggested that unsatisfactory experience with the neutral salt spray as an accelerated test was due to failure to define service performance properly, and that the CASS test has proved to be more satisfactory mainly because performance criteria have been more realistically defined.