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Technical Paper

Design Challenges in Developing the PACCAR Digital Message Center

The PACCAR Digital Message Center (DMC) is a truck computer with a 40-character vacuum-fluorescent display in the dash panel. Designed to OEM specifications, it serves to integrate the many data display requirements of heavy trucks into a single device. To meet customers' ergonomic expectations, consideration was given to information navigation, the display technology, the number of keys, the size of each key, the key labeling, and the keys' tactile feedback. The product was designed to be used by operators (clock/alarm, messaging, fuel economy information), service technicians (diagnostics and maintenance) and fleet managers (trip recording and fuel management). Configurability and software upgradeability were also important considerations.
Technical Paper

Electronic Vehicle Integration for the '90s: An Overview

In the trucking industry, if one can both reduce operating cost and offer more value to the customers, any increase in initial price will be offset in the long term by reduced operating cost, added comfort, and added safety. Electronics is a technology that represents an opportunity for trucking companies to maintain and perhaps increase market share. In order for truck manufacturers to be successful with electronics, they need to know what electronic devices are available, what the devices can do for the customer, and how to integrate them into a complete system.
Technical Paper

Simulation of Heavy Truck Ride Using a Desktop Computer

This paper presents an overview of the development and application of a simulation model used for the study of tractor-semitrailer ride dynamics. The model incorporates system excitation from road roughness, nonlinear leaf spring characteristics, dynamic spring rate characteristics of air springs, and a first-order analysis model of frame flexure.
Technical Paper

Variation in System Performance while Sorting DEF Heating Hardware Options

The desire to reduce NOx at low ambient temperatures drives the use of heating methods to make DEF available by thawing the solution in the tank. Methods to validate modelling used to design hardware options require testing to gauge the accuracy of the prediction. Using a climatic chassis dynamometer (CCD) to demonstrate the guidance procedure set by the Environmental Protection Agency (EPA) is expensive and time consuming. A method of utilizing a flow controlled cooling supply combined with a standard cold chamber is described as a precursor to running the demonstration in the CCD. Testing multiple quantities of design iterations produced unexpected variation in the results. The sources of the variation and modifications taken to minimize them are discussed and presented. Test to test control of coolant flow, coolant temperature, and specific chamber temperature inconsistencies were found to be critically important to a successful effort.