Engine control system and method
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsMichihisa Nakamura, Kousei Maebashi, Noritaka Matsuo
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Abstract
An engine measurement and control methodology wherein the engine combustion rate and IMEP are measured by measuring the in-cylinder pressure at specific crank angles and utilizing a basic reading of pressure in the combustion chamber when it will be near to atmospheric, and also at at least one point in time after ignition begins and before top dead center. The measured data can be employed for fine tuning the engine control to obtain optimum performance.
Claims40
An internal combustion engine having a combustion chamber which varies cyclically in volume during engine operation from a maximum volume BDC condition and a minimum volume TDC condition, an induction system for delivering an intake charge to said combustion chamber, means for initiating combustion in said combustion chamber, and an exhaust system for discharging exhaust gases from said combustion chamber, a pressure sensor for sensing pressure in said combustion chamber at at least certain engine output shaft angles, and means for taking a pressure reading at a time between the end of the exhaust stroke and the beginning of the compression stroke when the pressure in said combustion chamber is substantially atmospheric, at an engine output shaft angle after that angle and after ignition but before TDC and at crank angles after TDC in order to measure performance characteristics of said engine.
A control method for an internal combustion engine having a combustion chamber which varies cyclically in volume during engine operation from a maximum, volume BDC condition and a minimum volume TDC condition, an induction system for delivering an intake charge to said combustion chamber, means for initiating combustion in said combustion chamber, and an exhaust system for discharging exhaust gases from said combustion chamber, said method comprising the steps of sensing pressure in said combustion chamber at at least certain engine output shaft angles, and taking a pressure reading at a time between the end of the exhaust stroke and the beginning of the compression stroke when the pressure in said combustion chamber is substantially atmospheric, at an engine output shaft angle after that angle and after ignition but before TDC and at crank angles after TDC in order to measure performance characteristics of said engine.
Dependencies are inferred from the claim text.