How to Use Doosan e-Doctor Run-up Test Function?

Doosan e-Doctor EDIA allow users to use “Run-up Test” function,it is used to check the power deviation of each cylinder.

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Auto Start icon

– Start and idle the engine before clicking the Auto Start icon.

– The test will be started as soon as you click the start icon.

– The test will be performed six times automatically.

– After performing the test six times, automatically will be stopped.

 

Manual Start icon

– Select the cylinders you want to test.

– If the Manual Start icon is clicked, perform the test for only the selected cylinders.

 

Stop icon

– Makes the test stop.

 

Status message

– It enables you to trace the test progress.

 

Measurement result

– Max speed: Indicates the max. RPM of each cylinder during the test.

– Min speed: Indicates the min. RPM of each cylinder during the test.

– Elapsed time: Indicates the time to reach the max. RPM. from min. RPM

 

How to view the graph

– It shows the results (in percentage) the deviation between cylinders based on the cylinder having the longest time until RPM reaches max.

-If the deviation of any cylinder exceeds than standard value, you can assume that the cylinder or the unit injector for the cylinder is defective.

 

▣ case study of run up test

For example, there is one engine which Cyl. No 2 injector is bad condition.

Once you press run up test button, The ECU cut No1 injector off and start to check engine power (The engine is running with 5 cylinder power only. at that time, ECU gives signal to 5 injectors to maintain 6 cylinder working power)

 

But engine power will not be reached up to 6 cylinder output because No 2 injector cannot make a normal output as above assumption.

Next, the ECU will cut No2 injector off and start to check engine power.

In this case, engine power will be OK as 6 cylinder working because other five cylinders have no problem.

 

And the ECU cut No3 injector off and check engine power.

Then, engine power cannot be reached as 6 cylinder power because No 2 injector cannot make a normal output.

This test will be repeated until No.6 cylinder. By checking each cylinder output, ECU can recognize that No2 injector is bad.

 

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