Which of the following is not a goal of a microprocessor-based engine control system?

• A. Better engine performance
• B. Better fuel economy
• C. Lower exhaust emissions
• D. Lower noise emissions

Answer: (D)

Engine control systems use a microprocessor to optimize combustion by adjusting fuel delivery, air intake, and ignition timing based on sensor data. The primary goals are to improve engine performance, increase fuel efficiency, and reduce exhaust emissions by making combustion as clean and efficient as possible. Lower noise emissions, while beneficial, isn’t a direct objective of the engine control unit; noise is largely governed by the exhaust and intake acoustics, engine mounting, and other NVH factors, not the core control logic. So the statement about lowering noise emissions isn’t a primary goal of the microprocessor-based control system, even though smoother operation from proper control can marginally affect perceived noise.