Zero-speed injector test method for engine cold test

Abstract

The invention discloses a zero-speed fuel injector test method for engine cold test. Rail pressure relief; 3. Check whether the engine rail pressure drops to the fuel injector test trigger value, if so, go to step 4; 5. After all fuel injectors are powered on, end the fuel injector test and display the rail pressure test curve. The invention is tested under the condition of zero speed in the cold test of the engine, so as to prevent the fuel injected by the injector from polluting the environment, avoid engine compression ignition caused by residual fuel in the combustion chamber of the engine, and frequent disconnection of the equipment safety clutch, and improve the cold test injection of the engine. Consistency of oiler repeated tests.

Description

technical field [0001] The invention relates to an engine cold test method, in particular to a zero-speed fuel injector test method for the engine cold test. Background technique [0002] In the field of modern engine manufacturing, engine cold test has become more and more important in the delivery inspection of engine production line due to the advantages of fast test cycle and low environmental pollution. As an important part of the engine, the fuel injector affects the overall performance and even the safety of the engine, and is also one of the inspection contents of the conventional cold test bench. [0003] The engine cold test fuel injector test method in the prior art is that when the engine is rotating, such as when the engine speed is 300 RPM, the bench supplies power to the fuel injector to open the fuel injector, and the fuel common rail pressure is adjusted by the engine rail pressure sensor. The detection of the falling pressure value and slope is used to det...

AI Technical Summary

Problems solved by technology

Since the engine does not ignite during the cold test, part of the fuel injected into the engine combustion chamber by the injector will be discharged into the air along with the intake and exhaust strokes of the engine, causing environmental pollution

And there is still some fuel in the engine combustion chamber, which is very easy to be compressed and ignited in the next compression stroke of the engine, causing the engine to ignite and the operating torque to increase instantly, resulting in the safety clutch disengagement of the equipment or even damage to the main servo motor of the equipment.

At the same time, the engine will also drive the high-pressure oil pump to rotate and continue to supply oil to the high-pressure fuel rail during the injector test, resulting in no obvious changes in the fuel rail oil pressure, resulting in poor consistency in the test results of the same engine injector. Taking a 4-cylinder diesel engine as an example, the range of the 4-cylinder pressure test results can reach 350 Bar, and the defect detection ability is low

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