Diagnosis of DI Diesel combustion from in-cylinder pressure signal by estimation of mean thermodynamic properties of the gas

Fault Detection in a Diesel Engine by Analysing the Instantaneous Angular Speed

Torque estimation techniques in the real-time basis for engine control and diagnostics applications using the measurement of crankshaft speed variation are disclosed. Two different torque estimation approaches are disclosed including Stochastic Analysis and Frequency Analysis. An estimation model function consisting of three primary variables representing crankshaft dynamics such as crankshaft position, speed and acceleration is used for each estimation approach. The torque estimation method is indenpendent of the engine inputs (air, fuel, and spark). Both approaches have been analyzed and compared with respect to estimation accuracy and computational requirements. Results show that both methods permits estimations of the indicated torque based on the crankshaft speed measurement while providing not only accurate but also relatively fast estimations during the computational processes.

Engine control using torque estimation

Model-based diagnosis of large diesel engines based on angular speed variations of the crankshaft

A number of embodiments of engine controls and engine control methods that employ instantaneous rate of combustion is the combustion chamber at a sensed parameter. Rate of combustion is determined by a linear equation based upon data arrived from combustion chamber pressures. The system is adapted to operate under different control modes so as to provide specific control for normal running, lean burn, maximum torque, cold starting, transient conditions, and/or knock control. The desired rate of combustion is achieved by engine control adjustments.

Engine control system and method

An elastic model of the engine-drivetrain system is proposed. Measured crankshaft speed fluctuation data is developed and computations are made from the model to determine the fluctuation waveform of both the total engine torque being developed and the engine pressure torque. Utilizing the engine pressure torque fluctuation waveform, the mean level of engine torque being developed is obtained, thus providing the full engine pressure torque waveform. Finally, the engine pressure torque waveform is used to obtain the cylinder pressure waveform which gave rise to it. Knowledge of these torques and of the cylinder pressure provides the basis for both open loop and adaptive engine control strategies.

Cylinder-by-cylinder engine pressure and pressure torque waveform determination utilizing crankshaft speed fluctuations

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Cylinder-by-cylinder engine pressure and pressure torque waveform determination utilizing crankshaft speed fluctuations