Method for regulating and controlling rotating speed of turbocharger

Abstract

The invention discloses a method for regulating and controlling the rotating speed of a turbocharger. According to the main design concept, exhaust output energy of an engine, namely energy for driving the turbocharger to do work, can be monitored through pressure and temperature sensors arranged at an inlet and an outlet of a volute of the turbocharger, then, the rotating speed of the turbocharger under the current exhaust output energy is estimated in combination with a turbocharger rotating speed relation calibrated in advance based on different exhaust energy magnitudes, and then the rotating speed of the turbocharger is compared with a preset rotating speed limit to achieve regulation and control of the rotating speed of the turbocharger. The method has the core concept of making a forward judgment on the subsequent working state of the turbocharger according to the exhaust condition; and compared with the prior art adopting an opposite way, the method effectively avoids the defect of reversely speculating the rotating speed of the turbocharger according to the effect after supercharging and greatly reduces the turbocharger overspeed misjudgment probability, so that efficient operation of the turbocharger can be guaranteed while the turbocharger overspeed phenomenon is avoided.

Description

technical field [0001] The invention relates to the field of engine control, in particular to a method for regulating the rotational speed of a turbocharger. Background technique [0002] With the increasingly stringent national fuel consumption regulations, the use of engine boosting technology has become the development direction of various automobile manufacturers. Turbocharging uses the exhaust energy after engine combustion to do work to drive the turbine to rotate at high speed to compress fresh air, so as to increase the intake air volume and improve engine power. The turbocharger is a high-speed rotating component (the maximum speed of the impeller can reach 250,000 revolutions), and it works in a condition where the working conditions change rapidly. The turbocharger will overspeed when it is working (the speed of the turbocharger exceeds the Material maximum speed requirements), resulting in turbocharger failure. Therefore, generally, related parts and sensors ar...

AI Technical Summary

Problems solved by technology

[0007] According to the above scheme, due to the complex actual driving conditions of the vehicle, it is easy to cause differences between the actual speed of the turbocharger and the estimated speed due to changes in boundary conditions, resulting in the risk of overspeeding of the turbocharger, and because the turbocharger is used The exhaust energy of the engine after combustion does work to drive the turbine to rotate at a high speed to compress the fresh air. Therefore, the engine exhaust is the direct energy source for the turbocharger to work, and the boost pressure is the performance result of the turbocharger. Through the results, it can be deduced The potential manifestation of the turbocharger is also uncertain

[0008] In summary, using the above scheme to estimate the turbocharger speed has a large uncertainty and deviation, that is, there is a difference between the estimated model and the actual turbocharger speed, which will also bring the risk of overspeed

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