Terminology and Abbreviations biles are even programmed to adjust engine operation for things like valve wear and combustion chamber deposit buildup as the engine ages. In automobiles the same computers are used to make smart cars by controlling the steering, brakes, exhaust system, suspension, seats, anti-theft systems, sound-entertainment systems, shifting, doors, repair analysis, navigation, noise suppression, environment, comfort, etc. On some systems engine speed is adjusted at the instant when the transmission shifts gears, resulting in a smoother shifting process. At least one automobile model even adjusts this process for transmission fluid temperature to assure smooth shifting at cold startup. Engine. | Sec. 1-4 Terminology and Abbreviations 17 biles are even programmed to adjust engine operation for things like valve wear and combustion chamber deposit buildup as the engine ages. In automobiles the same computers are used to make smart cars by controlling the steering brakes exhaust system suspension seats anti-theft systems sound-entertainment systems shifting doors repair analysis navigation noise suppression environment comfort etc. On some systems engine speed is adjusted at the instant when the transmission shifts gears resulting in a smoother shifting process. At least one automobile model even adjusts this process for transmission fluid temperature to assure smooth shifting at cold startup. Engine Management System EMS Computer and electronics used to control smart engines. Wide-Open Throttle WOT Engine operated with throttle valve fully open when maximum power and or speed is desired. Ignition Delay ID Time interval between ignition initiation and the actual start of combustion. Figure 1-13 Harley-Davidson two-cylinder air-cooled overhead valve Knucklehead motorcycle engine first introduced in 1936. The 45 V engine had displacement of 60 cubic inches with inch bore and inch stroke. Operating on a four-stroke cycle with a compression ratio of 7 1 the engine was rated at 40 bhp at 4800 RPM. Ignition was by Harley-Davidson generator-battery system. Photograph cour-Ifayle f Da Htsloe y-DaV dso 1 Juneau Avenue Archives. All rights reserved. Copyright 18 Introduction Chap. 1 Figure 1-14 Harley-Davidson motorcycle of 1936 powered by Knucklehead engine shown in Fig. 1-13. The motorcycle had a rated top speed of 90-95 MPH with a fuel economy of 35-50 MPG. Photograph courtesy of the Harley-Davidson Juneau Avenue Archives. All rights reserved. Copyright Harley-Davidson. Air-Fuel Ratio AF Ratio of mass of air to mass of fuel input into engine. Fuel-Air Ratio FA Ratio of mass of fuel to mass of air input into engine. Brake Maximum Torque BMT Speed at .
