INTELLIGENT CONTROL, CORRECTION, AND ADAPTABILITY OF OUTPUT PARAMETERS IN VEHICLE INTAKE SYSTEMS
Keywords:
idle air control valve, mass airflow sensor, diagnosis, testing, cylinder cutout, speed, toxicity, fuel efficiencyAbstract
Presently, modern motor industry is developing in the lines of significant intellectualization, automation, and robotization of system functioning.
This calls for the development of a comprehensive system of system management algorithms.
However, when the technical condition of individual electronic components changes, management algorithms can significantly vary. Thus, high-quality operation of an object requires correction and adaptation of the operation algorithms to the changing technical condition of vehicle systems. Thus, failures of mass airflow sensors and idle air control valves amount to 14 and 12%, respectively, of all failures in the microprocessor-based engine control system. These failures lead to a serious change in fuel consumption and exhaust toxicity.
In order to eliminate these failures, we developed an experimental research procedure to elaborate the modes of correction and adaptation to the changing technical condition of these electronic elements of cars.
This procedure implies the formation of test stresses which consist in disconnecting n-number of cylinders and their individual operating cycles and subsequent loading of k-number of operating cylinders.
The engine is loaded with the friction horsepower of the disconnected cylinders. The operating cylinders are loaded smoothly and the response to the loading process is recorded by monitoring the following parameters: the position of the idle air control valve, voltage at the test terminal of the mass airflow sensor, cyclic fuel consumption, cyclic air consumption, fuel correction, ignition advance angle.
Experimental studies allowed us to plot diagrams of dependencies of the control parameters on the cylinder load. We analyzed the diagrams and determined the inflection points that correspond to the prelimit and limit change in the technical condition of the mass airflow sensors and idle air control valves.
Control of these inflection points during vehicle operation in the test mode makes it possible to monitor the technical condition, correct, and adapt at every moment when the technical condition of the mass airflow sensors and idle speed controllers changes. The developed method of test stresses makes it possible to avoid purchasing of expensive load banks. Development and implementation of a gasoline engine loader integrated into the electronic control unit of an engine provide an economic effect of about 3.9 thousand rubles per year for each diagnosed car.
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