components and plot them against each other
The following sensors are used for WS3B:
MAP (analogue voltage) against Injectors (petrol)
RPM (Hall digital crank or distributor) against Injectors (petrol)
Oxygen sensor against Injectors (petrol)
Ignition primary against Injectors (petrol)
Ignition primary voltage against Ignition primary current
MAP (analogue voltage) against Injectors (petrol)
Signal Name: MAP Sensor vs Injectors
Volt/division: 10V
Time/division: 5ms
This waveform is comparing injector to the MAP sensor. This waveform was taken at idle so the MAP sensor voltage did not change. The injector waveform is normal. If more throttle is applied then there will be more voltage at the MAP sensor and the injectors will be opening and closing faster than at idle.If the MAP voltage did not change then the injection speed would not change so the engine wouldn't run at optimal performance.
RPM (Hall digital crank or distributor) against Injectors (petrol)
The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The CKP sensor is fluctuating at idle producing AC voltage. As the CKP voltage increasing and the amplitude this means the engine is rotating faster. So the injectors will open and close quicker.
Oxygen sensor against Injectors (petrol)
We were unable to have the waveforms on the same screen because of the digital oscilloscope .The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The oxygen sensor is fluctuating from rich to lean.
Ignition primary against Injectors (petrol)
We were unable to have the waveforms on the same screen because of the digital oscilloscope .The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The beginning of the ignition waveform is charging voltage. The Voltage then drops to 0V by the ECU/ Igniter. Next a Back EMF is caused which is 40V. Which is when the spark is created. Next is spark duration and coil oscillations and back to charging voltage.
These two compare because when there is fuel being injected , you need a spark to complete combustion and create any form of power. As injectors spray quicker a spark needs to be created quicker. If there was no spark or injection the engine would not run. Unless it was just no spark or injection on 1 cylinder or 2 cylinders for some engines.
We were unable to get a waveform using current as it wasn't supported by the oscilloscope.
This waveform is comparing injector to the MAP sensor. This waveform was taken at idle so the MAP sensor voltage did not change. The injector waveform is normal. If more throttle is applied then there will be more voltage at the MAP sensor and the injectors will be opening and closing faster than at idle.If the MAP voltage did not change then the injection speed would not change so the engine wouldn't run at optimal performance.
RPM (Hall digital crank or distributor) against Injectors (petrol)
Signal Time: RPM Sensor vs Injectors
Volt/division: 10V
Time/division: 10ms
The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The CKP sensor is fluctuating at idle producing AC voltage. As the CKP voltage increasing and the amplitude this means the engine is rotating faster. So the injectors will open and close quicker.
Oxygen sensor against Injectors (petrol)
We were unable to have the waveforms on the same screen because of the digital oscilloscope .The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The oxygen sensor is fluctuating from rich to lean.
Ignition primary against Injectors (petrol)
We were unable to have the waveforms on the same screen because of the digital oscilloscope .The injector is just the normal waveform with charging voltage, PWM time, Back EMF then back to charging voltage. The beginning of the ignition waveform is charging voltage. The Voltage then drops to 0V by the ECU/ Igniter. Next a Back EMF is caused which is 40V. Which is when the spark is created. Next is spark duration and coil oscillations and back to charging voltage.
These two compare because when there is fuel being injected , you need a spark to complete combustion and create any form of power. As injectors spray quicker a spark needs to be created quicker. If there was no spark or injection the engine would not run. Unless it was just no spark or injection on 1 cylinder or 2 cylinders for some engines.
We were unable to get a waveform using current as it wasn't supported by the oscilloscope.
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