Definition of ignition advance angle

發動機實際在活塞到達壓縮沖程上止點前就點火，點火時刻到壓縮沖程上止點時刻之間活塞的位移折算成曲軸轉角，即稱點火提前角。

The engine actually ignites before the piston reaches the top dead center of the compression stroke. The displacement of the piston between the ignition time and the top dead center of the compression stroke is converted into the crankshaft angle, which is called the ignition advance angle.

以山東辰龍12V190系列燃氣發電機組為例，其點火提前角一般為30-42°曲軸轉角，具體數值根據隨機說明書結合燃氣具體成分而定。

Taking the Shandong Chenlong 12V190 series gas generator set as an example, its ignition advance angle is generally 30-42 ° crankshaft angle, and the specific value is determined based on the random instruction manual combined with the specific composition of the gas.

點火提前角由廠方技術服務人員在燃氣發電機組安裝調試時設定好，用戶一般不需再調整。但隨著機組使用時間的延長，磁電機驅動器與齒輪箱聯軸器凹槽磨損，會造成點火提前角略有改變，因此應進行季節性檢查和調整。另外，在更換磁電機時，也會涉及到點火提前角的檢查和調整。

The ignition advance angle is set by the technical service personnel of the factory during the installation and commissioning of the gas generator set, and users generally do not need to adjust it again. But with the extension of the unit's usage time, the grooves of the magneto driver and gearbox coupling will wear out, causing slight changes in the ignition advance angle. Therefore, seasonal inspections and adjustments should be carried out. In addition, when replacing the magneto, it will also involve checking and adjusting the ignition advance angle.

建議用戶在機組安裝調試好正常運行后，實測機組當前點火提前角數值，記錄備案。

It is recommended that users measure the current ignition advance angle value of the unit and record it for record after the unit is installed and debugged for normal operation.

2測量點火提前角的方法

Method for measuring ignition advance angle

測量點火提前角通常有“使用點火正時燈”和“拖動法”兩種。“使用點火正時燈”

There are usually two methods for measuring the ignition advance angle: using the ignition timing light and using the drag method. "Using ignition timing lights"

的方法簡便易行但測量結果有一定誤差;“拖動法”的測量結果準確度較高。

The method is simple and feasible, but the measurement results have certain errors; The measurement accuracy of the drag method is relatively high.

（1）使用點火正時燈

(1) Using ignition timing lights

①接通點火正時燈的12VDC工作電源。

① Turn on the 12VDC working power supply for the ignition timing light.

注意:過高的工作電源會將點火正時燈燒壞。

Attention: Excessive power supply can burn out the ignition timing light.

②將點火正時燈的接線夾夾住發動機缸的高壓點火線主電纜部分。

② Clamp the wiring clip of the ignition timing light onto the main cable of the high-voltage ignition line of the first cylinder of the engine.

注意:夾前將高壓點火線主電纜外層保護膠皮擼起，否則正時燈感應不到點火信號。

Attention: Before clamping, roll up the outer protective rubber of the high-voltage ignition wire main cable, otherwise the timing light will not sense the ignition signal.

③手持點火正時燈，使燈頭對準飛輪指針尖端處，并指向飛輪刻度盤。

③ Hold the ignition timing light in hand, aligning the lamp head with the tip of the flywheel pointer and pointing towards the center of the flywheel dial.

④啟動發動機，使其怠速運行。每當發動機缸點火時，點火正時燈就發出亮光。亮光對應的刻度即為當前機組點火刻度。則，當前機組點火提前角=（360°-當前機組點火刻度)。

④ Start the engine and let it idle. Whenever the first cylinder of the engine is ignited, the ignition timing light will illuminate. The scale corresponding to the bright light is the current ignition scale of the unit. Then, the ignition advance angle of the current unit is (360 ° - ignition scale of the current unit).

（2）拖動法

(2) Drag method

①在發動機飛輪刻度320°前后15°范圍內貼上示波器紙(或傳真紙)，按照飛輪原有刻度在示波器紙上做出同樣的刻線。

① Stick oscilloscope paper (or fax paper) within 15 ° before and after the engine flywheel scale of 320 °, and make the same engraved line on the oscilloscope paper according to the original scale of the flywheel.

注意:應事先在示波器紙(或傳真紙)上做好方向標記，以免將點火提前和滯后混淆。

Attention: Direction markings should be made on the oscilloscope paper (or fax paper) in advance to avoid confusion between ignition advance and delay.

②把發動機缸高壓點火線拔掉，換上專用的加長的導線，使導線一端插入點火線圈輸出端，另一端固定在飛輪指針尖端處，導線的末端距離示波器紙2-4mm。

② Unplug the high-pressure ignition wire of the first cylinder of the engine and replace it with a specialized extended wire. Insert one end of the wire into the output end of the ignition coil and fix the other end at the tip of the flywheel pointer. The end of the wire should be 2-4mm away from the oscilloscope paper.

③在切斷氣源的條件下，按下“起動”按鈕，使啟動馬達拖動發動機運轉，此時，導線末端和示波器紙之間放電出現火花，把示波器紙擊穿。

③ Under the condition of cutting off the air source, press the "Start" button to make the starting motor drag the engine to run. At this time, sparks will discharge between the end of the wire and the oscilloscope paper, causing the oscilloscope paper to break through.

④幾秒后，松開“起動”按鈕，停止啟動馬達，取下示波器紙查看，火花擊穿密集位置對應的刻度即為當前機組點火刻度。則，當前機組點火提前角=(360°-當前機組點火刻度)。

④ A few seconds later, release the "start" button, stop the motor, remove the oscilloscope paper to check, and the scale corresponding to the spark breakdown dense position is the current unit ignition scale. Then, the ignition advance angle of the current unit is (360 ° - ignition scale of the current unit).

3設定點火提前角方法

3. Method for setting ignition advance angle

(1)六缸十二缸燃氣機安裝磁電機設定點火提前角的方法(以調整機組點火提前角至40°曲軸轉角為例)①盤轉飛輪，至一缸處于壓縮沖程上止點位置的0刻度，再倒回40°，即，指針指示320°。此時，齒輪箱聯軸器的凹槽傾斜方向確定。

(1) The method of installing a magneto to set the ignition advance angle for a six cylinder twelve cylinder gas engine (taking adjusting the ignition advance angle of the unit to 40 ° crankshaft angle as an example) ① Rotate the flywheel until one cylinder is at the 0 mark of the top dead center position on the compression stroke, then reverse it to 40 °, that is, the pointer indicates 320 °. At this point, the direction of inclination of the groove of the gearbox coupling is determined.

②轉動磁電機的驅動器，使轉軸上旋轉的短紅刻線對準磁電機正面面板上的CCW線。此時一，磁電機驅動器的傾斜方向確定。

② Rotate the driver of the magneto so that the short red engraved line rotating on the shaft aligns with the CCW line on the front panel of the magneto. At this point, the tilt direction of the magneto driver is determined.

③裝上磁電機，此時，發動機點火提前角近似為40°。

③ Install the magneto, and at this time, the ignition advance angle of the engine is approximately 40 °.

注意:安裝磁電機時應確保其驅動器與齒輪箱的聯軸器嚙合到位。

Attention: When installing the magneto, ensure that its driver is properly engaged with the coupling of the gearbox.

④用拖動法檢查點火提前角的實際值，調整至需要的數值。

④ Use the drag method to check the actual value of the ignition advance angle and adjust it to the desired value.

⑤十二缸燃氣機磁電機調整位置到極限情況需要調整錐齒輪(倒齒)。方法為

⑤ The position of the twelve cylinder gas engine magneto needs to be adjusted to the limit, and the bevel gear (reverse gear) needs to be adjusted. The method is

a.松開齒輪箱側面觀察蓋上的緊固螺釘，取下觀察蓋。

a. Loosen the fastening screws on the observation cover on the side of the gearbox and remove the observation cover.

b.松開連接盤與齒輪箱固定的6個緊固螺釘，將小錐齒輪連同傳動軸一同抽出，使兩個錐齒輪脫離嚙合。

b. Loosen the 6 fastening screws fixed between the connecting plate and the gear box, and pull out the bevel gear and the transmission shaft together to disengage the two bevel gears.

c.轉動小錐齒輪(每倒一個齒點火提前角改變約12°)，使聯軸器凹槽方向與磁電機連接盤的傾斜方向一致。

c. Rotate the small bevel gear (the ignition advance angle changes by about 12 ° for each inverted tooth) to align the direction of the coupling groove with the tilt direction of the magneto connecting plate.

d.將小錐齒輪裝回原處，使兩個錐齒輪重新嚙合，蓋好觀察蓋。

d. Install the small bevel gear back into its original position, re engage the two bevel gears, and cover the observation cover.

e.裝上磁電機，復查點火時間。

e. Install the magneto and recheck the ignition time.

四缸發動機安裝磁電機設定點火提前角的方法(以調整點火提前角至32°為例)。

The method of setting the ignition advance angle by installing a magneto on a four cylinder engine (taking adjusting the ignition advance angle to 32 ° as an example).

①工作原理

① Working principle

4缸燃氣發動機(4-190)點火系統由磁塊感應線圈磁電機點火線圈火花塞構成。點火順序為1-2-4-3。

The ignition system of a 4-cylinder gas engine (4-190) consists of a magnetic induction coil, a magnetic motor ignition coil, and a spark plug. The ignition sequence is 1-2-4-3.

飛輪上分別在160°340°位置處鑲嵌有兩個磁塊。在飛輪旁安裝有內側外側兩個感應線圈。外側感應線圈連接14缸，內側感應線圈連接23缸。

There are two magnetic blocks embedded at positions 160 ° and 340 ° on the flywheel. There are two induction coils installed on the inner and outer sides next to the flywheel. The outer induction coil is connected to cylinder 14, and the inner induction coil is connected to cylinder 23.

發動機工作時，飛輪上的磁塊每當經過感應線圈時，獲取一個信號，并把此信號傳遞給磁電機。磁電機按此信號提供的順序發出點火電能，經過點火線圈變壓，由火花塞點火。

When the engine is working, the magnetic block on the flywheel receives a signal every time it passes through the induction coil and transmits this signal to the magneto. The magneto emits ignition energy in the order provided by this signal, which is then transformed by the ignition coil and ignited by the spark plug.

當外側感應線圈次獲取磁塊信號時，1缸點火，旋轉180度后，內側感應線圈獲取磁塊信號，2缸點火。飛輪再旋轉180度后，外側點火線圈獲取磁塊信號，4缸點火，再旋轉180度后，內側感應線圈獲取信號，3缸點火。

When the outer induction coil first obtains the magnetic signal, cylinder 1 ignites. After rotating 180 degrees, the inner induction coil obtains the magnetic signal, and cylinder 2 ignites. After the flywheel rotates another 180 degrees, the outer ignition coil receives a magnetic signal, which ignites cylinder 4. After rotating another 180 degrees, the inner induction coil receives a signal, which ignites cylinder 3.

②設定方法

② Setting method

a.盤轉飛輪，至一缸處于壓縮沖程上止點位置的0刻度，再倒回32°，即指針指示328°。

a. Rotate the flywheel until it reaches the 0 mark of the top dead center position on the compression stroke of cylinder 1, and then reverse it by 32 °, indicating a pointer of 328 °.

b.轉動磁電機連接塑料盤，使傾斜方向與法蘭內轉盤的傾斜方向一致，將磁電機裝好。

b. Rotate the magnetic motor to connect the plastic disc, so that the tilt direction is consistent with the tilt direction of the inner flange turntable, and install the magnetic motor.

c.移動兩個感應線圈，對準飛輪上的磁塊，并使兩個感應線圈處于同心直線上，固定感應線圈。此時，發動機點火提前角近似為32°。

c. Move two induction coils, align them with the magnetic blocks on the flywheel, and align them in a concentric line to fix the induction coils. At this point, the ignition advance angle of the engine is approximately 32 °.

d.檢查點火提前角的實際值，并調整至需要的數值。

d. Check the actual value of the ignition advance angle and adjust it to the desired value.