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24 TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT - ĐẠI HỌC ĐÀ NẴNG

Fig. 10. Measurement outcomes for the HHO
gas nozzle and fuel injection signal pulse
Fig. 8. HHO nozzle control algorithm flow chart
The HHO injector control circuit diagram (Figure The Hantek DSO5072P wave detector has two
9) shows how ECU-HHO connects to and receives input channels, each of which corresponds to a single
signals from the engine's fuel injector control ECU injector, that are coupled to the two output signals
using an Arduino microcontroller. The HHO injector from the fuel injector and the HHO injector. The
lift start time is determined by using the fuel injector nozzles in Figure 10 have a pulse width of 4
lift start time as a reference and the fuel injector milliseconds. The synchronization of the opening and
signal as input to the ECU-HHO. closing periods of both nozzle types indicates that the
HHO supplemental spray controller functions
Simultaneously, the engine speed is ascertained
using the fuel injector signal. Pin D3 of the according to its intended design. Consequently, the
microcontroller receives the signal that is fed in from HHO nozzle will open at the beginning of the fuel
the fuel injector via the PC817 optical isolator. The injector's opening moment and close at the conclusion
microcontroller's installed software will determine the of the charging operation. This guarantees system
motor speed and HHO injection time. It will also safety and lowers the possibility of HHO backfiring.
provide a control signal to the HHO injector via pin 4. CONCLUSIONS
D5, passing through a mosfet. A rheostat that is In our study, built an ECU-HHO to modify the
attached to pin A0 of the microcontroller allows you HHO/air ratio, which helps to ensure a decrease in
to modify the HHO/air ratio. To keep an eye on the backfire and improve stability. Several conclusions
HHO injection process, crucial data such motor could be drawn following:
speed, the HHO/air ratio, and injection duration are 1. Due to its high flammability and wide
shown on the LCD screen. flammability limit, HHO must be thoroughly sucked
into the cylinder by the intake system in order to
prevent backfiring. This criterion cannot be met by
conventional vacuum valve intake systems. There is an
HHO component that, after leaving the injector, stays
on the intake manifold in all engine running states.
2. The highest concentration of H 2 that remains in
the intake line when giving HHO via injection method
depends on the injection pressure and HHO/air ratio.
When charging is completed, the maximum
concentration of H2 in the intake manifold is 0.2%
and 1.3%, respectively, at an engine speed of
7500rpm and an injection pressure of 5000Pa. This
corresponds to a ratio of 4.5% and 5.7%, respectively,
Fig. 9. Diagram for the ECU-HHO between HHO and air delivered to the engine.
injector control circuit 3. Because of the proper injection timing control
and sealed injectors that prevent the backburn
phenomenon, the engine can receive additional
horsepower from injectors that are managed by the
ECU-HHO.

ISBN: 978-604-80-9779-0