Instantaneous data acquisition and processing system for internal-combustion engine control
First Claim
1. A data acquisition and processing system for controlling running cycles of a two-stroke or four-stroke internal-combustion engine comprising:
- a crankshaft and at least one combustion chamber having at least one cylinder and a piston, an angular encoding means for producing pulses indicative of angular increments of the crankshaft and cycle synchronization pulses at each revolution thereof, means for delivering angular increments at regular angular intervals, a sensor for sensing at least pressure values in each combustion chamber, a measuring signal acquisition set including means for acquisition of the pressure values, a digital processor including storage means for storing parameters of the engine, means for locating automatically a true angular position of the crankshaft within each cycle by reference to pressure variations in the at least one combustion chamber, means for phasing the synchronization pulses with the angular increments, means for calculating in real time a mean indicated pressure PMI in the at least one combustion chamber at each one of successive cycles of the engine and a control for controlling at least from the calculated mean indicated pressure PMI optimum running parameters for the engine, and angular locating means for applying to the digital processor data relative to a position of the cycle synchronization pulses with respect to top dead center of the piston.
1 Assignment
0 Petitions
Accused Products
Abstract
The control system of the invention is associated with an engine provided with means for measuring one or several parameters including pressures (in the cylinder, induction pressure, exhaust pressure) for each cylinder, acceleration, injection needle lift, knock detection, engine torque, etc., and with means for the angular coding of the crankshaft position. The control system includes a synchronization set (7) co-operating with angular discrimination means so as to readjust automatically at any time the angular coding data with respect to the combustion cycles. An acquisition set digitizes at a high frequency the various data measured, and notably the pressure values taken during each cycle, simultaneously in all the cylinders. A processing set (18) including notably a fast digital processor suited for determining in real time complex physical parameters such as the man indicated pressure (PMI) at each cycle or each engine revolution, stability factors of these parameters in time, etc. The results obtained are applied to a control computer (19) suited for determining and optimizing various engine parameters such as fuel injection, advanced ignition, etc.
-
Citations
11 Claims
-
1. A data acquisition and processing system for controlling running cycles of a two-stroke or four-stroke internal-combustion engine comprising:
a crankshaft and at least one combustion chamber having at least one cylinder and a piston, an angular encoding means for producing pulses indicative of angular increments of the crankshaft and cycle synchronization pulses at each revolution thereof, means for delivering angular increments at regular angular intervals, a sensor for sensing at least pressure values in each combustion chamber, a measuring signal acquisition set including means for acquisition of the pressure values, a digital processor including storage means for storing parameters of the engine, means for locating automatically a true angular position of the crankshaft within each cycle by reference to pressure variations in the at least one combustion chamber, means for phasing the synchronization pulses with the angular increments, means for calculating in real time a mean indicated pressure PMI in the at least one combustion chamber at each one of successive cycles of the engine and a control for controlling at least from the calculated mean indicated pressure PMI optimum running parameters for the engine, and angular locating means for applying to the digital processor data relative to a position of the cycle synchronization pulses with respect to top dead center of the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A process for optimizing running of an internal-combustion engine having either two-stroke or four-stroke combustion cycles including a crankshaft, at least one combustion chamber having a cylinder and a piston, detecting means for measuring at least pressures in the at least one combustion chamber and angular encoding means producing pulses ai indicative of angular variations of the crankshaft and cycle synchronization pulses at each revolution thereof, comprising:
-
producing the pulses ai at determined angular intervals within each combustion cycle; locating a position of the synchronization pulses with respect to a top dead center of the piston; readjusting automatically angular pulses generated by the angular encoding means in order to make the angular pulses agree with a part of a combustion cycle at which the angular pulses are produced; determining in real time, during each cycle and for each combustion chamber, parameters including at least values of mean indicated pressure PMI and stability factors ST of the mean indicated pressure PMI values; providing mappings including the parameters; and controlling the engine to have a specified fuel consumption or a maximum engine torque, and a minimum rate of discharge of harmful exhaust gases from the engine in accordance with the mappings.
-
Specification