Sudden unloading speed regulation method for diesel engine

Abstract

The invention discloses a sudden unloading speed regulation method for a diesel engine. The method comprises the following steps that 1, a sudden unloading speed regulation function of the diesel engine is initialized; 2, an ECU monitors the real-time rotating speed of the diesel engine and judges whether the diesel engine happens sudden unloading action or not according to the real-time rotating speed of the diesel engine, if yes, the step 3 is executed, and if not, the real-time rotating speed of the diesel engine continues to be monitored; 3, the ECU sends a fuel cut-off request to a fuel quantity calculation module, when the fuel cut-off condition is met, the fuel quantity calculation module sets the fuel injection quantity to be 0, and the fuel cut-off action is executed on the diesel engine; 4, the ECU completes the fuel cut-off action, and the fuel quantity is recovered; and 5, the ECU starts fuel cut-off release timing, and the step 2 is executed after timing is finished. By means of the sudden unloading speed regulation method, the sudden unloading action of the diesel engine can be judged by monitoring the rotating speed of the diesel engine, an fuel cut-off action instruction is triggered, the frequency overshoot of the diesel engine can be reduced through fuel cut-off, and therefore the rapid and direct speed regulation effect is achieved.

Description

technical field [0001] The invention relates to a control method of a diesel engine, in particular to a speed regulation method for sudden unloading of a diesel engine. Background technique [0002] Diesel engine is a common equipment used to generate power and provide power. The sudden increase and sudden unloading characteristics are one of the important performance indicators of diesel engines. Among them, sudden unloading is a performance index for testing the transient frequency adjustment rate and the transient frequency adjustment stabilization time. The sudden unloading action of the diesel engine refers to the sudden unloading (shutdown) of the external load equipment. When the external load equipment is unloaded suddenly, the diesel engine cannot respond immediately, which will cause the output power of the diesel engine to change from a high value (such as 100KW) to a low value (such as 0KW) instantaneously. ), at this time, the speed of the diesel engine will sud...

AI Technical Summary

Problems solved by technology

This control method needs to combine the speed, time, and throttle opening, confirm the fuel injection volume by comparing the external characteristics, and adjust the fuel injection volume by integrating PID. There are many parameters to be collected, the calculation process is complicated, the speed adjustment response is slow and indirect, and the adjustment effect is often impossible. meet deadline

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