1.
Pressure reducer
1.Inlet pressure:
3-7bar;
2. Outlet pressure: 1-2
kbar;
3. Flow:40-50 N/h
Installation
requirements
● Pressure reducer is a supplied
accessory and shall be mounted in places with little vibration and near to the
engine with distance not exceeding 2m.
● It shall be installed behind
the filter and installation position shall be convenient for regular
adjustment, inspection and maintenance of pressure reducer.
● Pipeline connecting to
pressure reducer shall be reasonably arranged and free from interference.
●Pressure reducer gas outlet and the bottom shall
not be upward to prevent fuel gas greasy dirt from back flowing into pressure
reducer.
●Screw off the top cap and adjust the screw to
pressure reducer valve, turn clockwise to thicken and anticlockwise to thin
(Note: such mode of regulation is only applicable to high speed regulation).
2.
Low pressure gas filter
Technical parameters:
1.Maximum working
pressure: 2bar;
2. Working temperature:
-15℃～60℃;
3. Filter radius≤50μm.
Installation
requirements:
●Gas filter installation position must be
convenient for repair, cleaning and replacement;
●Within filter service life, pressure drop shall
be less than 20kPa to guarantee system performance.
● Pay attention to arrow pointed airflow
direction during installation
3.
Mixer
Technical parameters:
1. Fuel type: natural
gas, LPG, methane
2. Inlet pressure:
-0.37kPa
3.Working temperature: —40℃~121℃
Installation
requirements and operating instructions:
●Vertical installation
●Pay attention to arrow pointed airflow direction
during installation
4.
Wiring harness
Installation
requirements:
●Wiring harness is not allowed to be laid at
exhaust pipe side to avoid high temperature damage.
Wiring harness is more
than 150mm away from exhaust pipe and vortex end of turbocharger;
●Wiring harness shall be fixed reliably to
prevent interference or friction with sharp matters. If not, please take
protective measures.
●Wiring harness shall be free from intertwining
and overlapping and reasonably aligned, convenient for later maintenance.
Air
inlet
Gas
inlet
Mixture outlet
5.
Engine control unit (ECU)
ECU collects inlet
manifold pressure (MAP), inlet manifold temperature (MAT), engine phase, revolving
speed, outlet water temperature, exhaust oxygen concentration and other signals
and controls the action of electronic throttle, ignition timing and ignition
orders after calculation so as to accomplish electronic control of engine.
Engine control unit
(ECU) shall be installed in control panel to realize real-time monitoring of engine
parameters.
Technical parameters:
● Working voltage: 12V;
● Working environment: -20℃～100℃;
6.
Inlet temperature, pressure sensor (T/MAP)
T/MAP sensor integrates
pressure and temperature measurement. Engine control unit (ECU) uses sensor
signals to calculate engine’s mixture air input.
Technical parameters:
1.Applicable pressure:
20～250KPa
2.Applicable temperature:
-40℃～125℃
3.Voltage: 4.5V～5.5V;
7. Revolving speed
sensor
Revolving
speed sensor is mainly used to measure engine’s revolving
Technical parameters:
1.Normal working
temperature: -40℃～120℃
2.All magnetic field
allowable: ≤2KA/m
3.Maximum torque
allowable shall be 8N·m during
assembly; installation
gap shall be 1.5-2 mm;
4.Thread specification:
M18×1.5mm
8. Water temperature
sensor
Water temperature sensor
is mainly used to measure cooling water temperature. ECU may regulate idle
speed and ignition advance angle in different water temperatures according to
ECU stored data.
Technical parameters:
1.Rated working voltage:
5±0.15V
2.Temperature measuring
range: -40℃～﹢140℃
3. Normal working
temperature of connectors: -40℃～+130℃
9. Oxygen sensor (UEGO)
Oxygen sensor is used to
measure oxygen concentration in exhaust gas and transfer it into electrical
signal for the use of ECU so as to monitor engine’s air-fuel ratio.
Installation
requirements
●Installation position of oxygen sensor plays an
important part in system's work
accuracy, so it must be installed strictly in accordance with specific
requirements.
●It shall be installed 3～5 times of exhaust pipe
diameter away from downstream of turbocharger
outlet or exhaust elbow;
●It cannot be installed on exhaust elbow;
●In order to prevent oxygen sensor from being
burned on exhaust pipe and for the convenience of disassembly, thread shall be
smeared with anti-burning glue during the installation of oxygen sensor;
●Oxygen sensor wiring harness and connectors
shall be kept away from exhaust pipe to avoid caking;
●Height of oxygen sensor screw seat welded on
exhaust pipe shall be less than 10mm and length of oxygen probe in exhaust pipe
shall not be less than 13mm;
●Large gas consumption and unstable revolving
speed occur when sensor is in failure or wiring hardness and connector is in
bad contact;
●Oxygen sensor shall be installed on the exhaust
pipe (circumferential), facing away from the engine;
●Oxygen sensor satisfying above mentioned
conditions shall be close to turbocharger.
10.
Revolving speed sensor
Revolving speed sensor
is mainly used to measure engine’s revolving speed. Engine control unit (ECU)
uses revolving speed to control many parameters, including air input, amount of
fuel, ignition advance angle, etc. Control requirements of these parameters
request the engine control unit (ECU) to know engine’s camshaft position (for
example which cylinder is ignited) and revolving speed.
Technical parameters:
1.Normal working
temperature: measuring terminal: -40℃～150℃; plugging terminal: -40℃～
120℃;
2. All magnetic field
allowable: ≤2KA/m
3. Maximum torque
allowable shall be 8N·m during assemble (when 8.8 M6X12 bolts are used), installation
gap shall be 0.5~1.5mm.
11. Electronic throttle
Electronic throttle is
mainly used for controlling mixture flow, engine idling and maximum revolving
speed. ECU uses 1600Hz PWM signal to control the action of throttle and its working
stroke is limited to 10％～90％ (opening of butterfly
valve ) by ECU.
Failure of electronic
throttle or bad contact of connectors will lead to: unstable revolving speed, unable
to start, inhibited acceleration, unable to acceleration and other failures. Use
multi-meter to check contact status of connectors; in case that connectors and
wiring harness have no problems, and its feedback signal bounces, replacement
of new parts shall be taken into consideration.
Installation
requirements
●Electronic throttle shall be installed in
low-temperature environment.
12.
Ignition coil
This system adopts
independent cylinder ignition coil, ECU controls coil’s charging hours, charging
time and discharging hours and engine charge current shall be maintained at
6.5A under any conditions.
Installation
requirements:
● Ignition coil wiring harness shall be free from
stresses;
●Use multimeter to check the contact situation of
wiring harness and connectors;
●Ignition coil shall be kept away from engine
metal rack to prevent breakdown of sparking.
13.
High-voltage line
High-voltage line is
used to transmit high pressure spot generated by ignition coil to sparking plug
so as to generate electric spark for ignition of combustible mixture
Installation
requirements:
●High-voltage line assembly insertion pressure is
not greater than 80N, and withdrawal force shall be 30～ 70N;
14. Sparking plug
Sparking plug is used to
receive high voltage generated by ignition coil, generate electric spark and
ignite flammable gas. This engine uses double-platinum sparking plug.
Installation
requirements
●Installation torque of sparking plug: 20～25 N·m
●Sparkling plug gap: 0.35＋0.05mm (regulate with
plug gauge)
15. Debugger (optional)
As an ECU Ancillary
product, handheld debugger is mainly used for replacing supervisory computer to
carry out data alignment and parameter calibration upon ECU to make it in
optimum status, thereby to get rid of complicated ECU debugging works. It is
easy for debugging personnel to understand and adjust various ECU parameters.
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