六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種杆e也丨〜+ 1 種仃耘判疋方法，特別是指一種雔 缸賀射引擎之行程判定方法。 又 【先前技術】 如圖1所示，現有機車之單 ’是由一電子㈣置」早$射引擎11作動的流程 …m 由一喷射裝置15控制適量的 …' 早缸噴射引擎11中，成為-油霧狀，並由該電 子控制單元發出點火信號控制—點火裝置13將該油霧 點燃’使—活塞14往復運動產生動力，而使該單虹噴射引 擎11作動’因此部分技術已為業界所通用，故不再多加贅 述0 而現有雙缸噴射引擎之動作流程大致上與該單缸喷射 引擎相同，該雙缸喷射引擎之第一、二汽缸的點火動作也 藉由電子控制單元控制，該雙缸喷射引擎還具有—可調整 該第-汽缸進氣量的第一節流閱、一可調整該第二汽缸進 氣量的第二節流閥、-連通該第-汽缸之進氣通道的第一 負壓取樣管，及-連通該第二汽缸之進氣通道的的第二負 壓取樣管，其中，該第一、二負壓取樣管皆連接一壓力感 知器，藉此能_測該第―、二汽缸的負壓值。 =過’由於該壓力感知器是同時連接該第_、二負壓 取樣官’ 4壓力感知器所偵測到的負壓值並無法精確得知 該第-、二汽缸個別的實際負壓狀況，僅能得知該第一、 二汽缸混合後之負壓值，倘該電子控制單元以該第一、二 1375752 汽紅混合的負壓值作為計算基準，將會忽略該第一、二汽 紅個別的負壓值，而無法取得該第_、二汽缸個別的最大 負麼值，進而難以對該第一、二汽缸進行準確的喷油與點 火。 【發明内容】 _因此，本發明之目的，即在提供—種雙缸喷射引擎之 行程判定方法’用以提高點火的準確度。 於是，本發明雙紅噴射引擎之行程判定方法，該雙缸 喷射引擎具有一連通—第一負壓取樣管的第-汽缸、一連 通1二負壓取樣管的第二汽缸’及—連接該第一、二取 樣管且用以伯測該第―、二汽缸的麼力感知器，該行程判 定方法包含_前置步驟、—啟動判斷步驟、—常態步驟， 及_重置步驟。 該前置步驟是切換-設置在該第一、二負壓取樣管上 的電磁閥’使該愿力感知器僅偵測該第一汽紅之負壓值而 獲得-負昼信號，並設置一用以偵測該引擎之曲軸轉動的 偵測器，使該偵測器獲得一編碼齒信號。 該啟動判斷步驟是藉由—電子控制單元比對該負虔信 號與編碼齒信號，若判斷該負壓信號之最大負值與該編碼 齒信號之空齒標記在同一週期内，則設定該空齒標記為執 行點火的上死點，並進入一常態步驟，若判斷不在同一個 週期内，則進入一重置步驟。 該常態步驟是令該電子控制單元控制一喷油裝置及 一點火裝置，使該编碼齒信號之兩個週期内各嘴油及點火 —次，且噴油油量為一第一設定量。 該重置步驟是令該電子控制單元控制該喷油裝置與點 火裝置，使該編碼齒信號之一個週期内各喷油及點火一次 噴油油量為一第二設定量，並進入該啟動判斷步驟。 本發明之功效在於，藉由該電磁閥的切換，使該壓力 感知器能㈣測該第H的最大負壓值，並同時與編碼 齒信號之空齒標記相比對，能夠在該第一汽缸的最大負壓 值時執行點火而提高其準確度，進而降低汽缸燃燒不完全 造成的汙染。 【實施方式】 有關本發明之前述及其他技術内容'特點與功效，在 乂下配合參考圖式之二個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 如圖2所示’本發明雙缸喷射引擎之行程判定方法的 第一較佳實施例，包含一前置步驟3〇1、一啟動判斷步驟 302、一常態步驟303，及一重置步驟3〇4。 如圖3、4所示’要先說明的是，該雙缸喷射引擎具有 一連通一第一負壓取樣管22的第一汽缸21、一連通一第二 負壓取樣管24的第二汽缸23、一連接該第一、二取樣管 22、24且用以偵測該第一、二汽缸21、23的壓力感知器 25，及一設置在該第—、二負壓取樣管22、24上的電磁閥 26,該雙缸喷射引擎還具有一曲轴41、一供該曲轴41穿置 1375752 的飛輪44’及多數設置在該飛輪44上的凸齒45，利用— 電連接一電子控制單元43的偵測器42偵測所述凸齒45， 即能夠獲得該曲軸41之轉速資料，在本實施例中，該電磁 閥26為雙向電磁閥，而該電子控制單元43即為車輛之 ECU(Electronic Control Unit)，而利用ECU來接收及判定該 曲轴41之轉速及油門開度，為所屬技術領域中具有通常知 識者所熟知的技術，在此即不加以贅述。 續如圖2、3所示，該前置步驟301是切換該電磁閥％ ，令該第一負壓取樣管22連通至該壓力感知器25，使該壓 力感知器25僅能夠偵測該第一汽缸21之負壓值，而庐得 一負壓k號，另外，如圖4所示利用該偵測器42偵測所述 凸齒45能夠獲得一編碼齒信號。 如圖2、4、5所示，該啟動判斷步驟3〇2是藉由該電 子控制單το 43比對該負壓信號與編碼齒信號，若判斷該負 壓信號之最大負值L與該編碼齒信號之空齒標p在同一 週期内，則設定該空齒標記p為執行點火的上死點，並進 入$心v驟3 03，若判斷不在同一個週期内，則進入一重 置步驟304,即該負壓信號之最大負值l與該編碼齒信號之 空齒標§己P在同一週划肉，m -Γ- /..,., 匁期内因而能夠設定該空齒標記Ρ為 執行點火的上死點。 如圖2、3、4所示，該f態步驟3()3是令該電子 ^43控制一喷油裝£46，及一點火裝置47,使該料 齒W之兩個週期内各噴油及點火—次且喷油油量為— 第"又疋量A該第-設定量為該雙缸喷射引擎運轉正常 6 1375752 之喷油量，其中，該壓力感知器25會隨著切換該電磁閥％ 而單獨偵測該第一汽缸21或第二汽缸23之負壓值。 該重置步驟3G4是令該電子控制單元43控制該喷油裝 置46與點火裝置47’使該編碼齒信號之—個週期内各喷油 :點火-次’而且嘴油油量為一第二設定量，該第二設定 量為該第-設定量的1/2，並進入該啟動判斷步驟3〇2。VI. Description of the Invention: [Technical Field] The present invention relates to a method for determining a stroke of a rod e 丨 + +1 [Prior Art] As shown in FIG. 1, the conventional locomotive's single 'is operated by an electronic (four) set "early shot engine 11...m is controlled by an injection device 15...the early cylinder injection engine 11, In the form of an oil mist, and the ignition control signal is issued by the electronic control unit - the ignition device 13 ignites the oil mist - causing the piston 14 to reciprocate to generate power, and the single rainbow jet engine 11 is actuated. It is common in the industry, so the description of the existing two-cylinder injection engine is roughly the same as that of the single-cylinder injection engine. The ignition of the first and second cylinders of the two-cylinder injection engine is also controlled by the electronic control unit. The twin-cylinder injection engine further has a first throttle that can adjust the intake air amount of the first cylinder, a second throttle that can adjust the intake air amount of the second cylinder, and a connection to the first cylinder a first negative pressure sampling tube of the gas passage, and a second negative pressure sampling tube connected to the inlet passage of the second cylinder, wherein the first and second negative pressure sampling tubes are connected to a pressure sensor, thereby Can _ measure the first -, second The value of the negative pressure cylinder. = "Because the pressure sensor is connected to the negative pressure value detected by the pressure sensor of the first and second negative pressure sampling officers", and the actual negative pressure condition of the first and second cylinders cannot be accurately known. Only the negative pressure value after mixing the first and second cylinders can be known. If the electronic control unit uses the negative pressure value of the first and second 1375752 steam red as the calculation basis, the first and second steam will be ignored. Red individual negative pressure values, and the maximum negative value of the first and second cylinders cannot be obtained, and it is difficult to accurately inject and ignite the first and second cylinders. SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a stroke determination method for a two-cylinder injection engine to improve the accuracy of ignition. Therefore, in the stroke determination method of the double red jet engine of the present invention, the two-cylinder injection engine has a first cylinder that is connected to the first negative pressure sampling tube, a second cylinder that connects the two negative pressure sampling tubes, and The first and second sampling tubes are used to test the first and second cylinders of the force sensor, and the stroke determination method includes a pre-step, a start determination step, a normal step, and a _ reset step. The pre-step is switching - the solenoid valve disposed on the first and second negative pressure sampling tubes is configured to cause the power sensor to detect only the negative pressure value of the first vapor red to obtain a - negative chirp signal, and set A detector for detecting the rotation of the crankshaft of the engine causes the detector to obtain an encoded tooth signal. The start determining step is to compare the negative chirp signal and the encoded tooth signal by the electronic control unit, and if the maximum negative value of the negative pressure signal is determined to be in the same period as the empty tooth mark of the encoded tooth signal, the empty is set. The tooth is marked as performing the top dead center of the ignition and enters a normal state step. If it is judged that it is not in the same cycle, it enters a resetting step. The normal step is to cause the electronic control unit to control an oil injection device and an ignition device such that the nozzle oil is ignited in two cycles of the coded tooth signal, and the amount of fuel injection is a first set amount. The resetting step is to cause the electronic control unit to control the fuel injection device and the ignition device so that the fuel injection and the ignition fuel injection amount in a cycle of the coded tooth signal is a second set amount, and enter the start determination. step. The effect of the invention is that, by switching the electromagnetic valve, the pressure sensor can (4) measure the maximum negative pressure value of the Hth, and at the same time compare with the empty tooth mark of the encoded tooth signal, can be at the first When the maximum negative pressure value of the cylinder is used, ignition is performed to improve the accuracy, thereby reducing the pollution caused by incomplete combustion of the cylinder. [Embodiment] The foregoing and other technical contents of the present invention will be clearly described in the detailed description of the two preferred embodiments of the present invention. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. As shown in FIG. 2, a first preferred embodiment of the method for determining the stroke of the twin-cylinder injection engine of the present invention includes a pre-step 3〇1, a start determination step 302, a normal step 303, and a reset step 3. 〇 4. As shown in FIG. 3 and FIG. 4, the twin-cylinder injection engine has a first cylinder 21 connected to a first negative pressure sampling tube 22 and a second cylinder connected to a second negative pressure sampling tube 24. 23, a pressure sensor 25 for connecting the first and second sampling tubes 22, 24 for detecting the first and second cylinders 21, 23, and a first and second negative pressure sampling tubes 22, 24 a solenoid valve 26, the twin-cylinder injection engine further has a crankshaft 41, a flywheel 44' for the crankshaft 41 to pass through 1375752, and a plurality of protruding teeth 45 disposed on the flywheel 44, for electrically connecting an electronic control unit The detector 42 of the 43 detects the protruding tooth 45, that is, the rotational speed data of the crankshaft 41 can be obtained. In the embodiment, the electromagnetic valve 26 is a two-way electromagnetic valve, and the electronic control unit 43 is the ECU of the vehicle. (Electronic Control Unit), and the ECU is used to receive and determine the rotational speed and the accelerator opening of the crankshaft 41, which are well known to those skilled in the art and will not be described herein. As shown in FIG. 2 and FIG. 3, the pre-step 301 is to switch the solenoid valve % to connect the first negative pressure sampling tube 22 to the pressure sensor 25, so that the pressure sensor 25 can only detect the first The negative pressure value of one cylinder 21 is obtained, and a negative pressure k is obtained. In addition, detecting the convex tooth 45 by the detector 42 as shown in FIG. 4 can obtain a coded tooth signal. As shown in FIGS. 2, 4, and 5, the start determining step 3〇2 is to compare the negative pressure signal with the encoded tooth signal by the electronic control unit το43, and determine the maximum negative value L of the negative pressure signal and the When the empty tooth mark p of the coded tooth signal is in the same cycle, the empty tooth mark p is set to perform the top dead center of the ignition, and enters the heart v step 3 03. If it is judged that it is not in the same cycle, then a reset is entered. Step 304, that is, the maximum negative value l of the negative pressure signal and the empty tooth mark of the coded tooth signal are in the same week, and the m-Γ-/..,. Mark Ρ as the top dead center for performing the ignition. As shown in Figures 2, 3 and 4, the f-state step 3 () 3 is such that the electronic device 43 controls a fuel injection device 46, and an ignition device 47 to spray the two teeth of the material tooth W. Oil and ignition - and the amount of fuel injected is - "The second amount" is the amount of fuel injected by the two-cylinder injection engine. The pressure sensor 25 will follow the switch. The solenoid valve % detects the negative pressure value of the first cylinder 21 or the second cylinder 23 separately. The resetting step 3G4 is to cause the electronic control unit 43 to control the fuel injection device 46 and the ignition device 47' to cause each injection of the coded tooth signal: ignition-times and the amount of oil in the mouth is a second The set amount, the second set amount is 1/2 of the first set amount, and enters the start determination step 3〇2.
如圖3、5所示’利用一開始該電磁閥％僅令該第一 _樣管22導通，使該壓力感知器25能夠偵測該第一 八缸21的最大負屋值L，並同時與編碼齒信號之空齒標記 P相比對’進而能夠在該第一汽缸21最大負壓值l時執行 點火而提高其準確度，降低汽&燃燒不完全造成的汗染。 如圖6所示，本發明雙缸喷射引擎之行程判定方法的 第二較佳實施 <列，大致上是與第一較佳實施例所揭露之結 構相同，不同的地方在於’該f關26為連續式電磁間，As shown in FIGS. 3 and 5, 'the first solenoid valve 22 is used to make the first_tube 22 turn on, so that the pressure sensor 25 can detect the maximum negative home value L of the first eight cylinder 21, and at the same time Compared with the empty tooth mark P of the coded tooth signal, it is possible to perform ignition at the maximum negative pressure value l of the first cylinder 21 to improve the accuracy and reduce the sweat stain caused by the incomplete combustion of the steam. As shown in FIG. 6, the second preferred embodiment of the stroke determination method of the twin-cylinder injection engine of the present invention is substantially the same as the structure disclosed in the first preferred embodiment, and the difference lies in the fact that the 26 is a continuous electromagnetic room,
該電磁閥26能夠切換導通該第一負壓取樣管η，或導通該 第-、一負歷取樣官22、24，而該壓力感知器25會隨切換 著該電磁閥26而偵測該第—汽缸21或第一、二汽缸21、 23混合之負壓值，藉此提供使用者另一種實施態樣。 綜上所述’藉由該電磁閥26的切換，使該壓力感知器 25 —開始能夠單獨偵測該第—汽缸21的最大負壓值[，並 同時與編碼齒仏號之空齒標記p相比對，而能夠在該第一 汽缸21最大貞壓值L時執行點火而提高其準確度，進而降 低〉飞缸燃燒不70全造成的汙染，故確實能達成本發明之目 的。 7 惟以上所述者，僅為本發明之較佳實施例而已，當不 月b以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一示意圖，說明現有機車之單缸喷射引擎作動 的流程； 圖2是一流程圖，說明本發明雙缸喷射引擎之行程判 疋方法的第一較佳實施例； 圖3疋一方塊圖，說明該第一較佳實施例之汽缸、負 壓取樣管，及壓力感知器之間的連結關係； 圖4是一示意圖，說明該第一較佳實施例之偵測器偵 測曲軸轉動的態樣； 圖5疋一時程圖，s兒明該第一較佳實施例之負壓信號 與編碼齒信號隨著時間變化的狀態；及 ^圖6是一方塊圖，說明本發明雙缸喷射引擎之行程判 定方法的第二較佳實施例。 1375752 【主要元件符號說明】 21…… …·第一汽缸 22···. •…第一負壓取樣管 23··..· •…第二汽缸 24•…· •…第二負壓取樣管 25·..·· ···· Μ力感知器 26•…. •…電磁閥 301… •…前置步驊 302… …·啟動判斷步驟 303… •…常態步驟 304… …·重置步驟The solenoid valve 26 can switch to turn on the first negative pressure sampling tube η or turn on the first and the first negative sampling controllers 22, 24, and the pressure sensor 25 detects the same with the switching of the electromagnetic valve 26 - The negative pressure value of the cylinder 21 or the first and second cylinders 21, 23, thereby providing another embodiment of the user. In summary, by the switching of the solenoid valve 26, the pressure sensor 25 can start to separately detect the maximum negative pressure value of the first cylinder 21 [and at the same time with the empty tooth mark p of the coded tooth number. In contrast, the ignition can be performed at the maximum pressure value L of the first cylinder 21 to improve the accuracy, and the pollution caused by the combustion of the flying cylinder is not reduced. Therefore, the object of the present invention can be achieved. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent change of the scope of the invention and the description of the invention. And modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the flow of operation of a single-cylinder injection engine of a conventional locomotive; FIG. 2 is a flow chart showing a first preferred embodiment of a stroke determination method of the twin-cylinder injection engine of the present invention. FIG. 3 is a block diagram showing the connection relationship between the cylinder, the negative pressure sampling tube, and the pressure sensor of the first preferred embodiment; FIG. 4 is a schematic diagram illustrating the detection of the first preferred embodiment; The detector detects the state of the crankshaft rotation; FIG. 5 shows a state of the negative pressure signal and the coded tooth signal of the first preferred embodiment as a function of time; and FIG. 6 is a block diagram. A second preferred embodiment of the stroke determining method of the twin-cylinder injection engine of the present invention will be described. 1375752 [Description of main component symbols] 21... .... first cylinder 22···. •...first negative pressure sampling tube 23··..·......second cylinder 24•...·......second negative pressure sampling Tube 25·..·········································································· step
41 .........曲軸 42 .........偵測器 43 .........電子控制單元 44 .........飛輪 45 .........凸齒 46 .........喷油裝置 47 .........點火裝置 L..........最大負值 P..........空齒標記41 .........Crankshaft 42 ....detector 43 .... electronic control unit 44 .... flywheel 45 . ........ convex tooth 46 ......... fuel injection device 47 ......... ignition device L..........maximum negative value P .......... empty tooth mark