Cylinder-by-cylinder engine pressure and pressure torque waveform determination utilizing crankshaft speed fluctuations
First Claim
1. A method of generating a signal related to the fluctuation of the pressure component of the torque or the mean engine torque or the engine pressure torque or the cylinder pressure produced by an internal combustion engine coupled through a drivetrain to a load, the method comprising the steps of determining the rate of rotation of a component of the engine-drivetrain-load combination and generating a first signal related thereto, determining the inertial component of the torque produced by the engine and generating a second signal related thereto, and combining the first and second signals to provide the desired signal
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Abstract
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.
45 Citations
14 Claims
- 1. A method of generating a signal related to the fluctuation of the pressure component of the torque or the mean engine torque or the engine pressure torque or the cylinder pressure produced by an internal combustion engine coupled through a drivetrain to a load, the method comprising the steps of determining the rate of rotation of a component of the engine-drivetrain-load combination and generating a first signal related thereto, determining the inertial component of the torque produced by the engine and generating a second signal related thereto, and combining the first and second signals to provide the desired signal
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13. A method of producing a signal related to the fluctuation of the pressure component of the torque or the mean engine torque, or the engine pressure torque, or the cylinder pressure produced by an internal combustion engine, the method comprising the steps of measuring the rate of rotation of an engine component and generating a first signal related thereto, determining the inertial component of the torque produced by the engine and generating a second signal related thereto, and combining the first and second signals to provide the desired signal.
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14. A method of producing a signal related to the fluctuation of the pressure component of the torque, or the mean engine torque, or the engine pressure torque, or the cylinder pressure produced by an internal combustion engine, the method comprising the steps of measuring the rate of rotation of a driven component to which the engine is coupled and generating a first signal related thereto, determining the inertial component of the torque produced by the engine and generating a second signal related thereto, and combining the first and second signals to provide the desired signal.
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