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Hi my name is ali i am MSc student in mechanical engineering. I need the answer of this question for my thesis. how much is injector pulse width accuracy in ordinary injector? thank you

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Range : 0 to 99.9ms

There are no definite specifications for injector pulse width, but the reading should change as engine speed and load change.

Posted on Aug 02, 2010

  • ali amini Aug 07, 2010

    I have selected Bosch Injector Model.0280150135 for my simulation work.
    In 2200 rpm of crank shaft speed the pulse width was 3.3 ms.
    Whereas pulsewidth accuracy should be more less than 3.3 ms because of control efficiency.
    I think it should be about 0.01 ms. Is it possible?

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With the ignition switch in the ON position, before engaging the starter, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to build up pressure. The PCM first tests speed density, then switches to the mass air flow (MAF) sensor. The PCM also uses the engine coolant temperature (ECT), the throttle position (TP), and the manifold absolute pressure (MAP) sensors to determine the proper air/fuel ratio for starting. The PCM controls the amount of fuel delivered in the starting mode by changing the pulse width of the injectors. This is done by pulsing the injectors for very short times.
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If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the throttle position (TP) sensor is at wide open throttle (WOT), the PCM reduces the injector pulse width in order to increase the air to fuel ratio. The PCM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the PCM returns to the starting mode .
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1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.

2. Wiggle tug test wiring for #2 injector.

3. Scope the #2 injector for a glitch when the misfire happens. 1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.

2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.

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J5

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