經濟部中央標準局貝工消费合作社印製 A7 ' f B7 五、發明説明（f ) (一)發明技術領域： 本發明是有關於一種電磁閥之控制及感測裝置，主要 是針對現有類比比例閥體控制系統，作數位化之變更以及 重新設計，達成簡易、精密與降低成本之控制目的。 (二潑明技術背景： 就一般市面上常用之機械工具機中，閥體之使用是非 常重要且必須執fr適當的控制動作者。一般而言，關於習 用比例式閥體所使用之類比式控制器技術中，其主要係以 類比訊號之方式執行訊號之傳遞及演算，並且使用一電流 限制控制(current-limit control)之方式達成電流之控制目 的，使得閥體軸能夠開於一定位上，進而使比例式閥體通 過一定之流童或是產生一定之壓力。然而，針對習用之類 比控制器而言，其電路內容相當複雜，並且可調整性極 差，再者其對抗電磁圈及閥體本身之控制是爲非線性之控 制特性，所以其控制效果不佳。 另外，習用技術中有使用線性可變位移轉換器(Linear Variable Displacement Transformer; LVDT)以作爲線性化之 控制元件，其主要係藉由調變與解調電路以及磁鐵線圈等 元件，以感測二次側之電壓差值，進而算出閥體之開關位 置，亦即可量測線軸移動之位置。然而該線性可變位移轉 換器之線性度雖高，但是其價格非常昂貴，將使得其產品 之競爭力變差，而不符合我們使用之條件。 本紙張尺度適用中國國家揉準（CNS > A4规格（210女297公羡） KJ-IJ'---丨—装丨-----訂------線 (請先閲讀背面之注意事項再填%本頁) A7 B7 經濟部中央樣準局男工消费合作社印— 五、發明説明（>) 所以，針對上述習用技術中，比例式閥體的類比式控 制器與線性可變位移轉換器等兩者而言，皆有其使用上之 缺點，有待且必要加以改善。 (三)發明之簡要說明： 有鑑於上述之缺失，本發明人乃以理論配合實際運 用，進而提出一電磁閥之控制及感測裝置之本發明案，其 不僅能達成抗干擾、靈活準確且線性化之調整控制裝置的 目的，並且能夠有效降低電路使用之成本。 即本發明之主要目的是爲提供一種閥體之控制裝置， 是能夠針對閥體之線圈及閥體本身之非線性作精密之補償 者，意即能夠達成高度之控制命令對流量或對壓力之線性 化。 本發明之次要目的是爲提供一種閥體之控制裝置，能 夠有效提高電能使用效率以及響應速度。 本發明之再一目的是爲提供一種閥體之控制裝置，能 夠同時降低雜訊之干擾。 本發明之又一目的是爲提供一種閥體之感測裝置，其 能藉由低成本之光電開關配合傳統運算放大器之電路技 巧，即可有效量出位置值，並可達成造價成本降低之目 爲了達到上述之種種目的，本發明乃是以中央處理單 元爲中心而設計一智慧型之數位控制裝置，該控制裝置所 有參數皆可透過中央處理單元(CPU)之串列通訊埠作精密 調整，且該中央處理單元係內含有一記憶體，該記憶骽內 KJ——·'----Ί 裝-Γ-----訂------線！ (請先閲讀背面之注意事項再填^_木頁) 本紙浪又度逋用中國國家梂準（CNS ) A4规格（210士297公兼7 A7 B7 經濟部中央揉準局貝工消费合作社印製 12第一電磁線圈 20控制裝置 22中央處理單元 24電源調整電路 26間隙感測電路 30感測裝置 32溫度補償電路 五、發明説明（ 存有控制電流對位置、位置對流量以及控制命令對控制電 流等等之非線性資料，俾能在控制時達成精密控制。另 外，中央處理單元之驅動輸出級係採脈寬調變(PWM)之方 式，能夠有效提高效率。 關於光電式位置回授感測裝置乃是使用光二極體/電晶 體對，以及一反對數放大器連接一溫度補償器達成有效之 測量距離，此法可大大地降低習用線性可變位移轉換器 (LVDT)之成本，使產品更具有競爭力，有效改善習用技術 之缺失》 (四)圖式簡要說明： 圖一係爲本發明實施例中所述之控制及感測裝置與一 般閥體之方塊連接示意圖。 圖二係爲本發明實施例中所述控制裝置之詳細電路 圖。 圖三係爲本發明實施例中所述感測裝置之詳細電路 圖。 圖號說明： 10閥體 14第二電磁線圈 21訊號狀態處理電路 23錯誤偵測冲斷電路 2¾率放大器 27電流感測電路 體膚晶體對 ΜΛ張尺度適用中國困家棣準（CNS ) A4规格（210X2抑公釐） . ^ ^裝_. 訂------線 > (請先閲讀背面之注意事項再填寫W頁) A7 B7 五、發明説明（斗） 33反對數放大器 (五)發明詳細說明： 本發明主要係有關於一種電磁閥之控制及感測裝置， 其中主要係針對現有之類比比例閥體控制系統，作數位化 的變更與重新設計’同時使用簡易低價之光電式位置感測 器，取代習用昂貴之線性可變位移轉換器，使迴授式比例 閥體達到簡易數位調整、更精密之流量或壓力控制，以及 低成本之功效。 煩請參閱圖一，圖一所示係爲本發明所述之控制裝置 20與一感測裝置30之連接，並且是與一閥體1〇之兩電磁線 圈12、14相連接之方塊連接關係圖，其中該控制裝置2〇乃 係用以輸出兩電流訊號I，而連接至第一電磁線圈12與第二 電磁線圈14，該第一電磁線圈12與第二電磁線圈14可使閥 體產生位移，進而改變該閥體10之輸出流童Q。此外，該 第二電磁線圈14係連接有一感測裝置30，係用以偵測該第 二電磁線圈14與第一電磁線圈12之位置者，進而輸出一位 置之感測訊號，之後該感測訊號再連接於該控制裝置20， 由該控制裝置20針對所偵測之位置作進一步之動作控制。 另一方面，該控制裝置20之另一輸入端係連接有一控制訊 號，其係爲一電壓訊號，可對該控制裝置20作控制。 關於該控制裝置20，主要係以一微處理器爲中心而設 計一智慧型數位控制裝置20，該控制裝置20之所有參數皆 可透過該微處理器之串列通訊埠作精密的控制調整，該微 處理器中可內含記憶骽，用以儲存非線性之控制資料，俾 本纸張尺度逋用中國國家標準（CNS > A4规格（210X^97公釐） -----I裝丨. (請先閲讀背面之注意事項再填Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, A7 'f B7 V. Description of Invention (f) (1) Technical Field of the Invention: The present invention relates to a control and sensing device for a solenoid valve, which is mainly aimed at existing analog ratios. The valve body control system is digitally changed and redesigned to achieve simple, precise and cost-saving control purposes. (Erbomine technology background: In general machine tools commonly used in the market, the use of the valve body is very important and must perform appropriate control actions. Generally speaking, the analog type used in the conventional proportional valve body In the controller technology, it mainly executes the signal transmission and calculation by analog signals, and uses a current-limit control to achieve the current control purpose, so that the valve body shaft can be opened in a position , So that the proportional valve body passes a certain flow of children or generates a certain pressure. However, for the conventional analog controller, its circuit content is quite complicated, and its adjustability is extremely poor, and its resistance to the electromagnetic coil and The control of the valve body is a non-linear control characteristic, so its control effect is not good. In addition, in the conventional technology, a Linear Variable Displacement Transformer (LVDT) is used as a linearized control element. It is mainly calculated by sensing the voltage difference on the secondary side through components such as modulation and demodulation circuits and magnet coils. The switch position of the body can also measure the position of the spool movement. However, although the linear variable displacement converter has high linearity, its price is very expensive, which will make its product competitiveness worse, which is not in line with our use. The conditions of this paper are applicable to China's national standard (CNS > A4 size (210 women 297 public envy) KJ-IJ '--- 丨 --installation 丨 ----- order ------ line (please First read the notes on the back and fill in the% page) A7 B7 Printed by the Male Samples Consumer Cooperative of the Central Sample Bureau of the Ministry of Economic Affairs-V. Description of the Invention (>) Therefore, for the above-mentioned conventional technology, the analog valve control of the proportional valve body Both converters and linear variable displacement converters have their shortcomings in use and need to be improved. (3) Brief description of the invention: In view of the above-mentioned shortcomings, the inventor has combined theory with practice Application, and then put forward the present invention of a solenoid valve control and sensing device, which can not only achieve the purpose of anti-interference, flexible and accurate and linear adjustment control device, and can effectively reduce the cost of circuit use. Main purpose It is to provide a valve body control device, which can accurately compensate for the non-linearity of the valve body coil and the valve body itself, which means that it can achieve a high degree of control command linearization of flow rate or pressure. The secondary object is to provide a control device for a valve body, which can effectively improve the efficiency of electric power usage and response speed. Another object of the present invention is to provide a control device for a valve body, which can reduce noise interference at the same time. Another object is to provide a valve body sensing device, which can effectively measure the position value through the low-cost photoelectric switch combined with the traditional operational amplifier circuit skills, and can achieve the purpose of reducing the cost and cost. For various purposes, the present invention is to design a smart digital control device with the central processing unit as the center. All parameters of the control device can be precisely adjusted through the serial communication port of the central processing unit (CPU). The processing unit system contains a memory, and the memory 骽 KJ—— · '---- Ί installed -Γ ----- Order ------ line! (Please read the precautions on the back before filling in the ^ _ wood page) This paper wave has been re-used in China National Standard (CNS) A4 specification (210 297 297 and 7 A7 B7) Control system 12 First electromagnetic coil 20 Control device 22 Central processing unit 24 Power supply adjustment circuit 26 Gap sensing circuit 30 Sensing device 32 Temperature compensation circuit V. Description of the invention (Control current to position, position to flow, and control command to control Non-linear data such as current can not achieve precise control during control. In addition, the drive output stage of the central processing unit adopts the method of pulse width modulation (PWM), which can effectively improve the efficiency. About the photoelectric position feedback The measuring device uses a photodiode / transistor pair and an anti-log amplifier connected to a temperature compensator to achieve an effective measurement distance. This method can greatly reduce the cost of the conventional linear variable displacement converter (LVDT) and make the product More Competitive and Effectively Improves the Lack of Conventional Technology "(IV) Brief Description of the Drawings: Figure 1 is a control and sensing device and Valve body block diagram. Figure two is a detailed circuit diagram of the control device described in the embodiment of the present invention. Figure three is a detailed circuit diagram of the sensing device described in the embodiment of the present invention. Figure number description: 10 valve body 14 The second electromagnetic coil 21 signal state processing circuit 23 error detection and punching circuit 2¾ rate amplifier 27 current sensing circuit body skin crystal is applicable to the Chinese standard (CNS) A4 size (210X2 suppression mm) for the M Λ scale. ^ ^ Equipment _. Order ------ Line > (Please read the precautions on the back before filling in page W) A7 B7 V. Description of the invention (bucket) 33 Anti-number amplifier (5) Detailed description of the invention: The present invention Mainly related to a solenoid valve control and sensing device, which is mainly for the existing analog proportional valve body control system, digital changes and redesign 'simultaneous and low-cost photoelectric position sensor to replace The expensive linear variable displacement converter is used, so that the feedback proportional valve body can achieve simple digital adjustment, more precise flow or pressure control, and low cost. Please refer to Figure 1 and Figure 1. It is a block diagram of the connection between the control device 20 and a sensing device 30 according to the present invention, and is connected to the two solenoid coils 12 and 14 of a valve body 10, where the control device 20 is a It is used to output two current signals I and is connected to the first electromagnetic coil 12 and the second electromagnetic coil 14. The first electromagnetic coil 12 and the second electromagnetic coil 14 can cause displacement of the valve body, thereby changing the output of the valve body 10. Child Q. In addition, the second electromagnetic coil 14 is connected with a sensing device 30, which is used to detect the position of the second electromagnetic coil 14 and the first electromagnetic coil 12, and then output a position sensing signal, The sensing signal is then connected to the control device 20, and the control device 20 performs further motion control on the detected position. On the other hand, the other input terminal of the control device 20 is connected with a control signal, which is a voltage signal and can control the control device 20. Regarding the control device 20, an intelligent digital control device 20 is mainly designed based on a microprocessor. All parameters of the control device 20 can be precisely controlled and adjusted through the serial communication port of the microprocessor. The microprocessor can contain memory to store non-linear control data. The paper size is in accordance with Chinese national standard (CNS > A4 specification (210X ^ 97 mm) ----- I)丨. (Please read the notes on the back before filling
.1T 線 經濟部中央標準局貝工消费合作社印裝 B7 B7 經濟部中央搮準局男工消费合作社印裝 五、發明説明（f) 能於控制時達成精密控制，以及該控制裝置20之微處理器 輸出級係採用脈寬調變(PWM)之方式達成電流控制，藉以 提高響應頻寬與效率。再者，該控制裝置20所控制之閥體 係可爲一比例式閥體，而所述之非線性資料係可爲控制電 流對閥體之開關位置、開關位置對閥體之流量或是控制命 令對控制電流等資料。 有關該控制裝置20之進一步詳細說明煩請參閱圖二， 圖二係爲本發明實施例中所述控制裝置20之詳細電路圖， 該控制裝置20即係接受感測訊號與控制訊號，用以線性化 地控制閥體之輸出流量Q。該控制裝置20中係包括有一中 央處理單元22，該中央處理單元22即爲前述之微處理器， 用以執行儲存資料與電流控制之動作，即係用以監控閥體 之狀態、閥體之開關線軸移動位置、脈波寬度調變之電流 控制與資料對照表之操作等控制動作，之後输出一脈寬調 變(PWM)之電流控制訊號》另一方面，該中央處理單元22 係可內建有一唯讀記憶體(ROM)，用以儲存控制之主程式 者；亦可爲使用一單晶片之唯讅記憶體(ROM)作爲儲存主 程式或是儲存相關非線性資料者之用。另關於唯讀記憶體 之使用，係可用以儲存使用者之設定資料、或是一氣隙感 測電路20之特性曲線、閥體流量Q與氣隙之關係以及儲存 比例積分微分控制(PID)演算之增益，且所述之儲存資料係 可於刻度校準之步驟中，作最新資料之自動更換者。 關於該中央處理單元22之输入端，係連接有一訊號狀 態處理電路21，兩者係爲雙向連接之方式，係用以提供一 本紙張尺度適用中國國家揉準（CNS ) A4规格（210><如7公釐） —.l·:——-----丨装------訂------線 J . 一 I (請先閲讀背面之注意事項再填寫^) 經濟部中央標準局負工清费合作社印製 A7 B7_ 五、發明説明（b) 介於該中央處理單元22與控制裝置20輸出入訊號之訊號狀 態數位界面，並且可將外界之訊號加以作數位化之處理， 以傳送至該中央處理單元22 »關於該訊號狀態處理電路21 之外界输入訊號則係包括有一致能訊號與一鍵盤訊號，並 且輸出一警示訊號者。若使用者有不同之閥體控制之需 求，則該訊號狀態處理電路21之输出入端，係更可擴充連 接有關位準位移、增益衰減、電壓限制、電流放大以及高 頻濾波等等不同狀態之功效。另外，該訊號狀態處理電路 21之一输出端係連接有一錯誤偵測/中斷電路23，用以偵測 输出入訊號是否有錯誤之情形發生，亦或是中斷訊號之連 接等作用；其中該錯誤偵測/中斷電路23係以硬體之方式， 達成錯誤偵測、短路電流保護與錯誤條件以及儲存中央處 理單元22之程式計算時間等等動作之中間協調者。 之後，該中央處理單元22與該錯誤偵測/中斷電路23等 兩電路之输出端則連接有一功率放大器25，用以將該中央 處理單元22與該錯誤偵測/中断電路23所输出之訊號加以放 大。然而，於本實施例中該功率放大器25係以兩個功率級 電晶體所組成者，意即其爲一電晶體串接之反相放大器 者。該功率放大器25之输出端係連接有一電流感測電路 27，用以偵測該功率放大器25之输出電流訊號，而於本實 施例中，該電流感測電路27乃係採用低阻值之電阻，作爲 量測該功率放大器25之输出電流，以降低電路之成本。 此外，該控制裝置20中係更包括有一間隙感測電路 26，係連接至該訊號狀態處理電路21，用以接受其他連接 本紙張尺度逍用中國國家標準（CNS ) A4规格（210X297公釐） Γ — _| n I I ,r ~~ ~~訂 I (請先閲讀背面之注意事項再填頁) 經濟部中央揉準局貝工消費合作社印裝 A7 B7 ----- τ ' * —-- 五、發明説明（Ί ) 之一感測器(圖二中無標示)的輸出感測訊號，經由該訊號 狀態處理電路21處理後，連接至該中央處理單元22作進一 步之迴授控制處理β其中所述之感測器係可包括有一光電 晶體及一反光板，用以偵測該閥體之開關線軸的移動距離 者。以及該控制裝置20更包括有一電源調整電路24，其接 收一電源之輸入，可調整輸出不同電壓值之電壓源；另 外，該電源調整電路24係與該錯誤偵測/中斷電路23相連接 者，並可输出±15V、±10V及+5V等直流電壓源，藉以供 其他電路使用。經由上述而完成本發明中之控制裝置20內 部電路方塊圖。 煩請參閱圖三，圖三所示係爲本發明實施例中所述感 測裝置30之詳細電路圖，該感測裝置30係可爲一光電式位 置感測器之裝置，其中主要包括有一光二極骽/電晶體對 31，係爲該感測裝置30之主要感應裝置，用以感應該閥體 10之開關線軸位置的變化。另包括有一反射板311，係配 合該光二極體/電晶體對32之光發射與接收的使用，可作爲 該光二極體之發射光線的反射用，其中該反射板311係可 爲一白色反射板者。之後該光二極體/電晶體對34之輸出端 再連接於一反對數放大器33，用以將閥體10之開醑線軸移 動距離與感測裝置30之输出電壓值的關係加以線性化量 測，進而輸出一位置訊號；此乃由於閥體10之開關氣隙的 移動距離與感測裝置30之输出訊號兩者間係成對數之關 係，所以必須加上一反對數放大器33加以線性化。此外， 該感測裝置30中更可包括有一溫度補償電路32，係連接於 (請先聞讀背面之注意事項再填寫本/- -裝. 訂 線 本纸張又度逋用中國困家揉準（CNS > Α4规格（210¾297公漦） A7 B7 五、發明説明（S' 該反對數放大器33 ’用以作爲該感測裝置30之溫度補償 者。 裝 訂 經由以上之技術揭露，顯見本發明所述之控制裝置20 係以數位訊號作運算’並用脈寬調變(PWM)以達成電流控 制，因此閥體中之電磁圈及閥體本身之非線性可精密地補 償，達成高度之控制命令對閥體流量或是對壓力之線性 化；並且提高電能效率及響應速度，同時降低雜訊之干 擾。另外，該感測裝置30乃係爲一光電式位置感測器，可 藉由低成本之光電開關配合傳統運算放大器之電路技巧， 即可量出閥體之開關線軸移動的位置，主要目的即是使造 價成本降低。如此而完成本發明所述電磁閥之控制及感測 裝置之技術描述，其爲有效改善習用技術之缺失，顯示本 發明極具進步性。 線 經濟部中央標準局貝工消費合作社印裂 綜上所述，本發明所述電磁閥之控制及感測裝置係能 作一數位化控制之變更與重新設計，且達成簡易數位化調 整閥體流量，更精密流量或壓力之控制，以及降低成本， 充份顯示出本發明之目的及功效上均深富實施之進步性， 極具產業之利用價值，且爲目前市面上前所未見之新發 明’完全符合發明專利之要件，爰依法提出申請。 唯以上所述者，僅爲本發明之較佳實施例而已，當不 能以之限定本發明所實施之範圍。即大凡依本發明申請專 利範圍所作之均等變化與修飾，皆應仍靥於本發明專利涵 蓋之範圍內，謹請貴審査委員明鑑，並祈惠准，是所至 禱》 本纸張尺度適用中國國家榡準（CNS ) Μ规格（210xife97公釐）.1T line printed by the Central Laboratories of the Ministry of Economic Affairs, Baker ’s Consumer Cooperatives B7 B7 Printed by the Central Laboratories of the Ministry of Economic Affairs, male laborers ’consumer cooperatives V. Description of the invention (f) Precision control can be achieved during control, and the control device 20 The output stage of the processor uses pulse width modulation (PWM) to achieve current control to improve the response bandwidth and efficiency. In addition, the valve system controlled by the control device 20 may be a proportional valve body, and the non-linear data may be the control current to the switch position of the valve body, the switch position to the valve body flow, or a control command. For controlling current and other information. For further detailed description of the control device 20, please refer to FIG. 2. FIG. 2 is a detailed circuit diagram of the control device 20 according to the embodiment of the present invention. The control device 20 receives a sensing signal and a control signal for linearization. Ground control valve body output flow Q. The control device 20 includes a central processing unit 22. The central processing unit 22 is the aforementioned microprocessor, and is used to perform data storage and current control operations, that is, to monitor the state of the valve body and the valve body. Switch spool movement position, current control of pulse width modulation and operation of data comparison table, and then output a pulse width modulation (PWM) current control signal. On the other hand, the central processing unit 22 is internal A read-only memory (ROM) is built to store the main program of the control; it can also be used to store the main program or a related non-linear data by using a single chip of the only-memory (ROM). In addition, the use of read-only memory can be used to store the user's setting data, or the characteristic curve of an air gap sensing circuit 20, the relationship between the valve body flow Q and the air gap, and the storage of proportional integral differential control (PID) calculations. Gain, and the stored data can be automatically replaced by the latest data in the calibration step. The input terminal of the central processing unit 22 is connected to a signal status processing circuit 21, and the two are connected in a two-way manner to provide a paper size applicable to the Chinese National Standard (CNS) A4 specification (210 > < (Such as 7mm) —.l ·: ——----- 丨 install ------ order ------ line J. I (Please read the notes on the back before filling in ^) Printed by the Central Bureau of Standards, Ministry of Economic Affairs, A7 B7_ V. Invention description (b) The digital interface between the central processing unit 22 and the control device 20 input and output signal status, and external signals can be used as digital The processed signal is transmitted to the central processing unit 22. The input signal of the outer boundary of the signal state processing circuit 21 includes a signal with a uniform energy and a keyboard signal, and a warning signal is output. If the user has different valve body control requirements, the input and output terminals of the signal state processing circuit 21 can be expanded to connect different states such as level displacement, gain attenuation, voltage limit, current amplification, and high-frequency filtering. Effect. In addition, an error detection / interruption circuit 23 is connected to one output end of the signal state processing circuit 21 to detect whether an error occurs in the input / output signals or to interrupt the connection of the signals. Among them, the error The detection / interruption circuit 23 is an intermediate coordinator in hardware to achieve actions such as error detection, short-circuit current protection and error conditions, and storage of the program calculation time of the central processing unit 22. Thereafter, a power amplifier 25 is connected to the output ends of the two circuits, such as the central processing unit 22 and the error detection / interruption circuit 23, for outputting signals from the central processing unit 22 and the error detection / interruption circuit 23. Zoom in. However, in this embodiment, the power amplifier 25 is composed of two power stage transistors, which means that it is an inverting amplifier in which a transistor is connected in series. The output end of the power amplifier 25 is connected with a current sensing circuit 27 for detecting the output current signal of the power amplifier 25. In this embodiment, the current sensing circuit 27 is a low resistance resistor. As a measure of the output current of the power amplifier 25, the cost of the circuit is reduced. In addition, the control device 20 further includes a gap sensing circuit 26, which is connected to the signal status processing circuit 21, and is used for accepting other connections to this paper standard, Chinese National Standard (CNS) A4 specification (210X297 mm) Γ — _ | n II, r ~~ ~~ Order I (please read the precautions on the back before filling in the page) Printed by the Central Government Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, A7 B7 ----- τ '* —- -V. Description of the invention (Ί) The output sensing signal of one of the sensors (not shown in Figure 2) is processed by the signal state processing circuit 21 and then connected to the central processing unit 22 for further feedback control processing. The sensor described in β may include a photoelectric crystal and a reflective plate for detecting the moving distance of the valve spool of the valve body. And the control device 20 further includes a power adjustment circuit 24 which receives an input of the power and can adjust the voltage source outputting different voltage values. In addition, the power adjustment circuit 24 is connected to the error detection / interruption circuit 23 And can output DC voltage sources such as ± 15V, ± 10V and + 5V for other circuits. Through the above, the internal circuit block diagram of the control device 20 in the present invention is completed. Please refer to FIG. 3. FIG. 3 is a detailed circuit diagram of the sensing device 30 described in the embodiment of the present invention. The sensing device 30 may be a photoelectric position sensor device, which mainly includes a photodiode The 骽 / transistor pair 31 is the main sensing device of the sensing device 30, and is used to sense the change of the position of the switch spool of the valve body 10. It also includes a reflecting plate 311, which is used for the light emitting and receiving of the photodiode / transistor pair 32, and can be used for reflecting the light emitted by the photodiode. The reflecting plate 311 can be a white reflection Board. Then, the output end of the photodiode / transistor pair 34 is connected to an anti-log amplifier 33 to linearly measure the relationship between the movement distance of the spool of the valve body 10 and the output voltage value of the sensing device 30. Then, a position signal is output; this is because the moving distance of the switching air gap of the valve body 10 and the output signal of the sensing device 30 are in a logarithmic relationship, so an antilog amplifier 33 must be added for linearization. In addition, the sensing device 30 may further include a temperature compensation circuit 32, which is connected to (please read the precautions on the back before filling in this booklet). The paper for the binding thread has been rubbed by a Chinese sleeper again. Standard (CNS > A4 specification (210¾297 cm) A7 B7 V. Description of the invention (S 'The anti-log amplifier 33' is used as the temperature compensator of the sensing device 30. Binding is revealed through the above technology, and it is obvious that the present invention The control device 20 uses digital signals for calculation and uses pulse width modulation (PWM) to achieve current control. Therefore, the solenoid coil in the valve body and the nonlinearity of the valve body itself can be precisely compensated to achieve a high degree of control command. Linearize the valve body flow or pressure; and improve the power efficiency and response speed, while reducing noise interference. In addition, the sensing device 30 is a photoelectric position sensor, which can be used at low cost The photoelectric switch is matched with the circuit technique of the traditional operational amplifier, and the position of the valve spool movement can be measured. The main purpose is to reduce the cost. In this way, the control of the solenoid valve according to the present invention is completed. And the technical description of the sensing device, which is to effectively improve the lack of conventional technology, shows that the present invention is extremely progressive. The Central Standards Bureau of the Ministry of Economic Affairs printed the above report. And the sensing device can change and redesign digital control, and achieve simple digital adjustment of valve body flow, more precise control of flow or pressure, and cost reduction, fully showing the purpose and efficacy of the present invention. They are all rich in the progress of implementation, have great industrial use value, and are new inventions that have never been seen on the market. They are in full compliance with the requirements of invention patents, and they are filed according to law. It is only a preferred embodiment, when the scope of the present invention cannot be limited by it. That is, all equal changes and modifications made according to the scope of the patent application of the present invention should still be within the scope of the patent of the present invention. Examiners ’clear instructions and prayers are all we need” This paper size applies to China National Standards (CNS) M specifications (210xife97 mm)