A manual speed control device and signal processing method for a marine propulsion motor

Abstract

The application discloses a kind of ship propulsion motor manual rotating speed control device, by potentiometer, PLC and ship propulsion motor controller composition, on the basis of existing device increase a contact and a identification ring for identifying adjacent car order resistance boundary, after the resistance value of potentiometer is collected by the analog input module of PLC, it is converted into digital quantity, digital quantity input module collects the boolean quantity output by identification ring, after signal processing and calculation by CPU module, the car order and rotating speed pointed to by potentiometer handle are judged, and it is sent to ship propulsion motor controller by CAN communication.Compared with existing ship propulsion motor manual rotating speed control device, the application has the advantages of accurate and reliable car order identification, low cost, compact structure, mass production and no calibration when potentiometer spare parts is replaced, and the rotating speed can be fine tuned within a certain car order range.

Description

Technical Field

[0001] This invention belongs to the field of automated control technology for ship propulsion systems, specifically relating to a manual speed control device for a ship propulsion motor and its signal processing method. Background Technology

[0002] In the field of marine propulsion systems, to control the ship's speed, the crew must control the propulsion motor speed using a manual speed control device on the bridge. To obtain a wider speed range and better torque characteristics, the propulsion motor needs to switch different circuits according to different operating orders; therefore, the adjustable speed range of the propulsion motor is discontinuous. Within the same operating order range, the crew needs to make fine adjustments to the speed.

[0003] Existing speed control devices are mainly divided into two types: contact-type speed control devices, which use different switch contacts to precisely provide a fixed speed signal without requiring continuous speed adjustment; and potentiometer-type speed control devices, which can achieve continuous speed adjustment but are difficult to precisely provide a speed signal.

[0004] Compared with speed control devices in other fields, the manual speed control device for ship propulsion motors applied in the field of ship propulsion devices has the following special features: (1) Different driving orders correspond to continuous resistance ranges of potentiometers, but the speed ranges corresponding to different driving orders are discontinuous and jump. For example, for a certain type of ship, the driving order "Forward 1" corresponds to a propulsion motor base speed of 22 r / min, with a fine adjustment range of ±5 r / min and a resistance value of 150 to 400 Ω. The driving order "Forward 2" corresponds to a propulsion motor base speed of 55 r / min, with a fine adjustment range of ±5 r / min and a resistance value of 400 to 650 Ω. (2) The crew needs to fine adjust the propulsion motor speed within the driving order range. Therefore, within the same driving order range, the propulsion motor speed is continuously adjustable. For example, within the driving order range "Forward 1", the propulsion motor speed is continuously adjustable from 17 to 27 r / min. Within the driving order range "Forward 2", the propulsion motor speed is continuously adjustable from 50 to 60 r / min. (3) The propulsion motor speed is directly related to the navigation safety of the ship. Therefore, when the handle is pointed to any position of a certain speed control command, the resistance value output by the potentiometer must not exceed the upper or lower threshold of that speed control command to prevent the propulsion motor speed from jumping across speed control commands and causing danger. In summary, compared with the existing contact-type speed control devices that can only accurately set a few fixed speeds or the potentiometer-type speed control devices that are continuously adjustable but difficult to accurately set the speed, the ship propulsion motor speed control device must meet the special requirements of being both continuously adjustable and accurately controlling the speed within the speed control command range.

[0005] To meet the above requirements, existing ship propulsion motor speed control devices generally consist of a potentiometer, an analog amplifier circuit, and a ship propulsion motor controller. The potentiometer has a specific shape... Figure 1As shown, the system includes a handle, an inner disc that rotates with the handle, and a stationary outer disc. The outer disc surface is divided into different command zones. The inner disc surface has a scale line to indicate the command currently pointed to by the handle. When the operator rotates the handle, a potentiometer contact fixedly connected to the handle slides along a ring-shaped resistor, and the potentiometer outputs a continuously linearly changing analog voltage signal. The analog amplifier circuit filters and amplifies the analog voltage signal before providing it to the ship's propulsion motor controller. The ship's propulsion motor controller determines the command and controls the speed based on a preset command threshold range and the voltage / speed correspondence.

[0006] Existing manual speed control devices for propulsion motors used in ship propulsion systems have the following shortcomings:

[0007] (1) Due to limitations in technology and cost, the linearity of the resistance value of the ring resistor in batch-produced potentiometers is generally good, but the consistency of the total resistance value is often poor. Taking a commonly used plastic resistor potentiometer as an example, the linearity of this type of potentiometer is ≤0.1%, but the total resistance error is ≤15%. If the device uses a high-precision potentiometer with a total resistance error range of less than 1%, the cost will be significantly increased. In the design of the existing manual speed control device for propulsion motors, the lower voltage threshold for each vehicle order is determined. U L and upper limit threshold U H All are matched to the rotation angle of the potentiometer handle for the corresponding train command position. However, if the potentiometer resistance value does not match the design resistance value, the signal processing device may output an incorrect train command signal during use. For example... Figure 2 Taking the scenario shown as an example, the "Forward 1" position on the potentiometer dial covers a handle rotation angle range of 36–54°, while the "Forward 2" position covers a handle rotation angle range of 54–72°. According to the designed potentiometer angle-voltage output ratio, when the handle rotation angle is 36°, the voltage signal output by the amplifier circuit to the ship's propulsion motor controller... U o = U L1 =1.5V, when the handle is rotated 54°, the voltage signal output by the amplifier circuit to the ship propulsion motor controller. U o = U H1 =2.25V, when the handle is rotated to a 72° angle, the voltage signal output by the amplifier circuit to the ship propulsion motor controller. U o = U H2 =3V. Therefore, when the handle rotates 50°, the voltage signal output by the amplifier circuit to the ship propulsion motor controller should meet the following requirements:U o =2.08V, at the lower limit of the "forward one" gear. U L1 and upper limit U H1 Between these points, the ship propulsion motor controller determines the command as "Forward 1". However, if the actual resistance of the potentiometer deviates from the design resistance by +10%, then when the rotation angle of the handle falls within the 50° range covered by the "Forward 1" position, the actual voltage signal received by the ship propulsion motor controller will be... U o =2.89V, at which point this value is at the lower threshold of "forward two". U H1 and upper limit threshold U H2 Between these points, the ship's propulsion motor controller incorrectly interprets the command as "forward two". Similarly, because the actual resistance of the potentiometer deviates from its design resistance, the potentiometer angle-voltage output ratio obtained from the design resistance and the voltage signal received by the ship's propulsion motor controller are used as the basis for this error. U o The calculation of the crew's given rotational speed often results in significant deviations. For this reason, when mass-producing and replacing potentiometers in the manual rotational speed control device for marine propulsion motors, technicians need to calibrate the upper and lower thresholds and voltage / speed relationship of each command in the marine propulsion motor controller based on the measured data of each potentiometer. This calibration operation significantly reduces production efficiency. Furthermore, the manual rotational speed control device for marine propulsion motors also requires calibration after potentiometer replacement. This calibration operation requires specialized equipment and skilled technicians, and since the vessel lacks the necessary support after setting sail, crew members cannot replace potentiometer spare parts themselves.

[0008] (2) Even if the above-mentioned upper and lower limit thresholds of the vehicle order are set at the factory, the potentiometer will wear out after long-term use, and the output of the potentiometer will drift significantly. Therefore, when the handle is rotated to the vicinity of the boundary position of adjacent vehicle order positions, the signal processing device may output the vehicle order signal incorrectly, which may cause the speed jump across vehicle orders. Therefore, the existing manual speed control device for propulsion motors needs to be calibrated regularly.

[0009] (3) The existing manual speed control device for propulsion motors is based on analog circuits. During the amplification and transmission of analog signals, it will be affected by factors such as device temperature drift and cable voltage drop.

[0010] For the reasons mentioned above, it is necessary to design a manual speed control device for propulsion motors that eliminates the large resistance deviation of existing potentiometers, and that requires no calibration after replacing the potentiometer and is cost-effective when ship voyages are not guaranteed. Summary of the Invention

[0011] In order to solve the problems existing in the manual speed control device of the propulsion motor, one of the objectives of the present invention is to provide a manual speed control device for the propulsion motor with structural improvements based on the existing control device.

[0012] The technical solution adopted by this invention to solve its technical problem is: a manual speed control device for a marine propulsion motor, installed on the control panel of the marine propulsion motor, used for speed control of the propulsion motor, including a potentiometer and a marine propulsion motor controller, and further including a programmable logic controller (PLC) connected between the potentiometer and the marine propulsion motor controller, the PLC being connected to the marine propulsion motor controller via CAN; the PLC includes a central processing unit (CPU) module, a digital input module (DI), a CAN communication module, and an analog input module (AI) with RTD resistance measurement function; the potentiometer includes a handle and an annular resistor and an identification ring concentrically arranged on the base plate, the center of the annular resistor having a #1 sliding contact and a #2 sliding contact rotatably arranged via a rotating shaft, the #1 sliding contact... The head and the 2# sliding contact contact each other with the annular resistor and the identification ring via the 1# and 2# brushes, respectively. The surface of the 2# sliding contact contacting the identification ring is covered with a block-shaped insulating layer and a metal conductive layer at intervals. Two adjacent metal conductive layers are connected in series by an insulated flexible wire. The metal conductive layer at the end is connected to the leftmost terminal 1 of the annular resistor via an insulated flexible wire. The rightmost terminal of the annular resistor is connected to the 4# terminal. The 1# and 2# sliding contacts are connected to the 2# and 3# terminals via insulated flexible wires, respectively. The 1# and 2# sliding contacts are fixedly connected to the handle and rotate as an integral part of the handle. The 1#, 2#, and 4# terminals are connected to the analog input module, and the 1# and 3# terminals are connected to the digital input module.

[0013] The aforementioned manual speed control device for a ship propulsion motor has an identification ring whose area covered by the insulating layer and the conductive metal layer has the same arc as the outer dial of the potentiometer's control position.

[0014] The aforementioned manual speed control device for a marine propulsion motor has two sliding contacts, #1 and #2, both made of metal. The sliding contacts #1 and #2 are electrically insulated from the handle and the rotating shaft. When the #2 contact slides onto the metal conductive layer, the #2 contact and the #1 terminal are short-circuited. When the #2 contact slides onto the resin insulating layer, the #2 contact and the #1 terminal are open-circuited.

[0015] The aforementioned manual speed control device for a marine propulsion motor uses a ring resistor made of carbon film or plastic resistor with an accuracy grade of ≤20%, and the base plate is made of plastic insulating material.

[0016] The second objective of this invention is to provide a signal processing method for a manual speed control device for a ship propulsion motor, comprising the following steps:

[0017] Keep terminal #1 grounded. Short-circuit the negative terminal M- of the analog input module acquisition channel and the negative terminal I- of the PLC channel power supply and connect them to terminal #1. Connect the positive terminal M+ of the analog input module acquisition channel to terminal #2. Connect terminal #4 to the positive terminal I+ of the PLC channel power supply.

[0018] Connect terminal #1 to the common terminal M of the digital input module's acquisition channel, and connect terminal #3 to the +24V terminal of the digital input module's acquisition channel.

[0019] The analog input module detects the resistance between terminal #1 and sliding contact #1 and converts it into a digital value. R in The digital input module detects and identifies the Boolean signal K output by the loop; the CPU module outputs... R out =(-1) K * R in That is, when the identification loop outputs a closed signal, R out = -R in When the identification ring 3-2 outputs an open-circuit signal, R out = R in ;

[0020] When the controller adjustment is complete and the confirmation button is pressed, the current... R out Compared with the set lower limit of the vehicle order threshold R LL and R UL Comparison: If R LL < R out ≤ R UL If the current handle is pointing to the vehicle command, then it is determined that the current handle is pointing to that vehicle command; if R out < R LL or R out ≥ R UL If the current handle is not pointing to the correct vehicle command, then it is determined that the current handle is not pointing to the correct vehicle command; by comparison... R out And vehicle threshold R LL and RUL Determine the vehicle command that the handle is pointing to;

[0021] Vehicle order threshold R LL and R UL All should meet and Where A and B are the lower limit angles of the lever rotated to a certain gear position according to the design. θ 1 and upper limit angle θ 2 The digital signal at that time, x% is the maximum error of the individual resistance value during the manufacturing of the potentiometer, and θ is the maximum angle that the handle can rotate;

[0022] The CPU module identifies the Boolean signal output by the ring. K The rising and falling edges are used to obtain the resistance value corresponding to the initial position of a certain vehicle command. Then, based on the resistance value finally given by the crew and the relationship between unit angle and resistance value, the angular position of the handle and the corresponding rotation speed are accurately calculated. The rotation speed value is then sent to the propulsion motor controller of the propulsion vessel via the CAN communication module.

[0023] Furthermore, when the #2 sliding contact slides from the resin insulating layer of the identification ring to the metal conductive layer, a sudden change from 0 to 1 occurs at the junction of the Boolean signal K; when the #2 sliding contact slides from the metal conductive layer of the identification ring to the resin insulating layer, a sudden change from 1 to 0 occurs at the junction of the Boolean signal K; the digital input module captures the rising and falling edges of the Boolean signal K, and whenever a rising or falling edge is captured, the CPU module reads the value at the rising and falling edges of the resistor. R out The values ​​are then refreshed and stored in the variables respectively. R u and R d ;Will R u and R d Resistance value and vehicle order threshold R LL and R UL Compare, if the value R LL ≤ R u ≤ R UL Then choose R u The initial value R 0 Conversely, choose R d According to | Rout - R 0 |Obtain the relative position of the handle within a certain range of the engine, thereby obtaining the precise rotational speed required by the crew.

[0024] Furthermore, if the maximum error in the resistance value of an individual potentiometer during manufacturing is x%, then... and R UL Should be greater than ,in θ It is the maximum angle that the handle (1-1) can rotate.

[0025] Compared with existing manual speed control devices for propulsion motors, the present invention has the following advantages:

[0026] 1. By adding an identification ring, the output of the manual speed control device for the propulsion motor will not be affected by the consistency of potentiometer resistance, potentiometer wear, and ambient temperature. By capturing the rising and falling edge pulses generated by the identification ring, the resistance value of the initial position of the propulsion can be determined, thereby accurately calculating the speed corresponding to the handle position.

[0027] 2. The manual speed control device for the propulsion motor eliminates the need for analog amplifier circuits, resulting in a simple structure and reliable performance.

[0028] 3. The manual speed control device for the propulsion motor adopts a programmable logic controller (PLC) as the signal processing and communication device. Through analog-to-digital signal conversion and CAN communication, it not only improves accuracy but also avoids the effects of temperature drift of amplification devices and cable voltage drop in analog amplification and transmission circuits.

[0029] 4. Potentiometer resistance deviation does not affect the control device, so there is no need to use a high-precision potentiometer, resulting in low cost.

[0030] 5. Technicians no longer need to modify the upper and lower limit thresholds for vehicle command judgment in the ship propulsion motor controller based on the actual measurement results of each potentiometer, which effectively improves production efficiency.

[0031] 6. The spare potentiometer for the manual speed control device of the propulsion motor can be directly replaced by the crew when it is damaged, without the need for calibration.

[0032] 7. Compared with existing contact-type speed control devices that can only accurately set a few fixed speeds, and potentiometer-type speed control devices that can be continuously adjusted but are difficult to accurately control the given speed, the manual speed control device for marine propulsion motors needs to be both continuously adjustable and meet the requirement of accurately controlling the speed within the specified range. Attached Figure Description

[0033] Figure 1The appearance of the potentiometer in the existing ship propulsion motor speed control device;

[0034] Figure 2 A schematic diagram illustrating the output error of an existing ship propulsion motor speed control device.

[0035] Figure 3 This is a front view of the internal structure of the potentiometer in the speed control device of the present invention;

[0036] Figure 4 This is a side view of the internal structure of the potentiometer in the speed control device of the present invention.

[0037] Figure 5 This is a connection diagram of the sub-devices of the speed control device of the present invention;

[0038] Figure 6 This is a schematic diagram illustrating the working principle of the speed control device of the present invention.

[0039] The labels for each figure are as follows: 1-1—Handle, 1-2—Inner disc, 1-3—Outer disc, 3-1—Annular resistor, 3-2—Identification ring, 3-3—Sliding contact #1, 3-4—Sliding contact #2, 3-5—Insulated flexible wire #1, 3-6—Insulation layer, 3-7—Metallic conductive layer, 3-8—Terminal #1, 3-9—Insulated flexible wire #2, 3-10—Base plate, 3-11—Terminal #2, 3-12—Terminal #3, 3-13—Terminal #4, 3-14—Insulated flexible wire #3, 3-15—Insulated flexible wire #4, 3-16—Shaft, 4-1—Brush #2, 4-2—Brush #1, 5-1—Polypotentiometer, 5-2—Digital input module, 5-3—Analog input module, 5-4—CAN communication module, 5-5—CPU module, 5-6—Motor. Detailed Implementation

[0040] The embodiments of the present invention will be further described below with reference to specific examples and accompanying drawings.

[0041] To enable those skilled in the art to better understand the marine propulsion motor speed control potentiometer device proposed in this invention, the control potentiometer device will be clearly and completely described below with reference to the embodiments and accompanying drawings of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0042] Example 1

[0043] This embodiment makes the following main improvements based on the existing propulsion motor speed control potentiometer device: (1) An identification loop is added, and the Boolean signal generated by the identification loop is compared with the digital signal generated by the potentiometer.R in (2) Calculations are performed to prevent output errors due to individual resistance errors of the ring resistor. (3) A programmable logic controller (PLC) is used as the signal processing device. The accuracy is improved by digital-to-analog conversion, avoiding the effects of amplifier device temperature drift and cable voltage drop. (4) The manual speed control device for the propulsion motor eliminates the analog amplifier circuit, has a simple structure, and is reliable. (5) The resistance value of the initial position of the vehicle is determined based on the rising and falling edge pulses generated by the identification ring. The precise speed corresponding to the handle position is calculated by combining the relationship between resistance and rotation angle.

[0044] This embodiment illustrates a manual speed control device for a ship propulsion motor, which includes a potentiometer 5-1 and a ship propulsion motor controller. It also includes a programmable logic controller (PLC) connected between the potentiometer 5-1 and the ship propulsion motor controller. The PLC is connected to the ship propulsion motor controller via CAN.

[0045] The connections of potentiometer 5-1, PLC, and motor 5-6 in the device are as follows: Figure 5 As shown, the PLC includes a central processing unit (CPU) module 5-5, a digital input module 5-2 (DI), a CAN communication module 5-4, and an analog input module 5-3 (AI). The analog input module 5-3 should have an RTD resistance measurement function; preferably, a Siemens SIPLUS series AI 8xU / I / RTD / TCST AI module can be used.

[0046] Among them, the appearance of potentiometer 5-1 is similar to Figure 1 The potentiometer in the existing device is the same, and its internal structure is shown in the front and side views as follows. Figure 3 and Figure 4 As shown ( Figure 3 (Handle not shown) includes annular resistor 3-1, identification ring 3-2, sliding contact 1# 3-3, sliding contact 2# 3-4, insulated flexible wire 1# 3-5, terminal 1# 3-8, insulated flexible wire 2# 3-9, base plate 3-10, terminal 2# 3-11, terminal 3# 3-12 and terminal 4# 3-13, insulated flexible wire 3# 3-14, insulated flexible wire 4# 3-15, rotating shaft 3-16, brush 1# 4-2 and brush 2# 4-1.

[0047] The annular resistor 3-1 and the identification ring 3-2 are concentrically mounted on the base plate 3-10. The annular resistor 3-1 has a #1 sliding contact 3-3 and a #2 sliding contact 3-4 rotatably mounted at its center via a rotating shaft 3-16. The #1 sliding contact 3-3 and the #2 sliding contact 3-4 contact the annular resistor 3-1 and the identification ring 3-2 respectively via brushes 4-2 and 4-1. The surface of the #2 sliding contact 3-4 in contact with the identification ring 3-2 is covered with a block-shaped insulating layer 3-6 and a metal conductive layer 3-7 at intervals. Two adjacent metal conductive layers 3-7 are connected in series via an insulated flexible wire 3-5. The metal conductive layers 3-7 at the ends are connected to the annular resistor 3-1 via an insulated flexible wire 3-9. The leftmost terminal 3-8 of the resistor 3-1 is connected to the rightmost terminal 3-13 of the annular resistor 3-1. The sliding contacts 3-3 and 3-4 are connected to terminals 3-11 and 3-12 respectively via insulated flexible wires 3-14 and 3-15. The sliding contacts 3-3 and 3-4 are fixedly connected to the handle 1-1 and rotate as an integral part of the handle 1-1. The terminals 3-8, 3-11, and 3-13 are connected to the analog input module 5-3, and the terminals 3-8 and 3-12 are connected to the digital input module 5-2.

[0048] The area covered by the insulating layer 3-6 and the metal conductive layer 3-7 on the identification ring 3-2 has the same arc as the outer dial 1-3 of the potentiometer 5-1. The 1# sliding contact 3-3 and the 2# sliding contact 3-4 are both made of metal. The 1# sliding contact 3-3, the 2# sliding contact 3-4 and the rotating shaft 3-16 are electrically insulated from each other.

[0049] To reduce equipment costs, the ring resistor 3-1 can be made of carbon film or plastic resistors with an accuracy class of ≤20% or lower. The base plate 3-10 of the identification ring 3-1 can be made of plastic insulating material. To ensure good contact, the surface of the identification ring 3-2 and the contact surface of the #2 sliding contact 3-4 can be plated, with a smooth metal conductive layer 3-7 and a resin insulating layer 3-6 alternately applied from left to right along the sliding path of the #2 sliding contact 3-4. To identify the driving position of the outer dial 1-3 as indicated by the inner dial 1-2 scale via the identification ring, the area covered by the metal conductive layer 3-7 and the insulating layer 3-6 on the identification ring 3-1 has the same arc as the driving position area divided by the outer dial 1-3 of the potentiometer 5-1.

[0050] The sliding contact 3-3 (1#) maintains a good electrical connection with the annular resistor 3-1 through the brush 4-2 (1#), and the sliding contact 3-4 (2#) maintains a good electrical connection with the identification ring 3-2 through the brush 4-1 (2#).

[0051] To form the identification circuit, the metal conductive layers 3-7 of the identification ring 3-2 are connected in series via insulated flexible wire 3-5 (#1) and connected to terminal 3-8 (#1) via insulated flexible wire 3-9 (#2). In potentiometer 5-1, sliding contacts 3-3 (#1) and 3-4 (#2) are fixed to the rotating shaft 3-16 along with the handle 1-1. Sliding contacts 3-3, 3-4, and the handle 1-1 are collinear. Both sliding contacts 3-3 and 3-4 are made of conductive metal, and they are electrically insulated from each other. Therefore, when contact 2-4 slides onto the metal conductive layer 3-7, contact 2-4 and terminal 1-8 are short-circuited; when contact 2-4 slides onto the resin insulating layer 3-6, contact 2-4 and terminal 1-8 are open-circuited. The beginning of the annular resistor 3-1 is connected to terminal 1-8, and the end of the annular resistor 3-1 is connected to terminal 4-13. Its sliding contact 1-3 is connected to terminal 2-11 via insulated flexible wire 3-14, and its sliding contact 2-4 is connected to terminal 3-12 via insulated flexible wire 3-15. Therefore, as the handle 1-1 rotates, sliding contacts 1-3 and 2-4 slide along the tracks of the annular resistor 3-1 and the identification ring 3-2, respectively, generating a continuously linearly changing analog signal between terminal 1-8 and terminal 2-11.

[0052] In particular, in this embodiment, the programmable logic controller (PLC) can also be replaced by other chips with digital-to-analog conversion and communication functions, such as the GD32 series MCU.

[0053] Example 2

[0054] This embodiment discloses a signal processing method for a manual speed control device for a ship propulsion motor, the steps of which are as follows:

[0055] like Figure 5 As shown, terminal 3-8 of potentiometer 5-1 is grounded. The negative terminal M- of the acquisition channel of analog input module 5-3 and the negative terminal I- of the channel power supply of PLC are shorted and then connected to terminal 3-8. The positive terminal M+ of the measurement channel of analog input module 5-3 is connected to terminal 3-1, and terminal 3-13 is connected to the positive terminal I+ of the channel power supply of PLC. Through the above connection, the analog signal generated by the ring resistor 3-1 in potentiometer 5-1 is transmitted to the analog acquisition channel of analog input module 5-3.

[0056] Connect terminal 3-8 of potentiometer 5-1 to the common terminal M of the acquisition channel of digital input module 5-2, and connect terminal 3-12 of potentiometer 5-1 to the +24V terminal of the acquisition channel of digital input module 5-2. Through the above connection, the switching signal generated by the identification ring 3-2 in potentiometer 5-1 is transmitted to the digital acquisition channel of digital input module 5-2.

[0057] The information processing method of CPU module 5-5 is as follows: Analog input module 5-3 converts the resistance value acquired by the channel into a digital value. R in The analog input module 5-3 detects the resistance value between terminal 1# 3-8 and sliding contact 1# 3-3 and converts it into a digital value. R in The digital input module 5-2 detects and identifies the Boolean signal K output from the recognition loop 3-2; the CPU module 5-5 outputs... R out =(-1) K * R in That is, when the identification ring 3-2 outputs a closed signal, R out =- R in When the identification ring 3-2 outputs an open-circuit signal, R out = R in .

[0058] When the crew member finishes adjusting handle 1-1 and presses the confirmation button, the current... R out Compared with the set lower limit of the vehicle order threshold R LL and R UL Comparison: If R LL < R out ≤ R UL Then determine that the current handle 1-1 is pointing to the vehicle command; if R out < R LL or R out ≥ R UL If the current pointer 1-1 is not pointing to the correct vehicle command, then it is determined that the current pointer is not pointing to the correct vehicle command; by comparison... R out And vehicle threshold R LL and R ULDetermine the vehicle command that handle 1-1 is pointing to.

[0059] Vehicle order threshold R LL and R UL All should meet and Where A and B are the lower limit angles of the lever 1-1 rotated to a certain gear position according to the design. θ 1 and upper limit angle θ 2 The digital signal at that time, x% is the maximum error of the individual resistance value during the manufacturing of potentiometer 5-1, and θ is the maximum angle that handle 1-1 can rotate.

[0060] The speed signal processing method is as follows: CPU module 5-5 identifies the Boolean signal output by ring 3-2. K The rising and falling edges are used to obtain the resistance value corresponding to the initial position of a certain vehicle command. Then, based on the resistance value finally given by the crew and the relationship between the unit angle and the resistance value, the angular position and corresponding rotation speed of the handle 1-1 are accurately calculated. The rotation speed value is then sent to the propulsion motor controller of the propulsion vessel via the CAN communication module 5-4.

[0061] To prevent the device from outputting incorrect vehicle command due to resistance changes in potentiometer 5-1 caused by individual resistance errors or wear, a vehicle command threshold is set. R LL and R UL All have a certain margin.

[0062] like Figure 6 As shown, if A and B are both in the same position, the handle 1-1 of potentiometer 5-1 should be rotated to the lower limit angle of the driving position. θ 1 and upper limit angle θ 2 The resistance value is a digital quantity. If the maximum error in the individual resistance value of potentiometer 5-1 during manufacturing is x%, then... and R UL Should be greater than ,in θ It is the maximum angle that handle 1-1 can rotate.

[0063] Example 3

[0064] In this embodiment, the digital input module 5-2 detects and identifies the Boolean signal K output by the identification ring 3-2. This type of speed control potentiometer 5-1 can realize the function of continuous fine adjustment of speed under a certain command.

[0065] When the sliding contact 3-4 (#2) slides from the resin insulating layer 3-6 of the identification ring 3-2 to the metal conductive layer 3-7, a sudden change from 0 to 1 occurs in the Boolean signal K at the junction; when the sliding contact 3-4 (#2) slides from the metal conductive layer 3-7 of the identification ring 3-2 to the resin insulating layer 3-6, a sudden change from 1 to 0 occurs in the Boolean signal K at the junction; the digital input module 5-2 captures the rising and falling edges of the Boolean signal K, and whenever a rising or falling edge is captured, the CPU module 5-5 reads the value at the rising and falling edges of the resistor. R out The values ​​are then refreshed and stored in the variables respectively. R u and R d .

[0066] When the crew member presses the confirmation button, R u and R d Resistance value and vehicle order threshold R LL and R UL Compare, if the value R LL ≤ R u ≤ R UL Then choose R u The initial value R 0 Conversely, choose R d .

[0067] Calculate based on when the crew member presses the confirmation button | R out - R 0 |Obtain the relative position of handle 1-1 within a certain range of the vehicle, thereby obtaining the precise rotational speed required by the crew.

[0068] The specific embodiments described herein are merely illustrative examples of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A manual speed control device for a marine propulsion motor, comprising a potentiometer (5-1) and a marine propulsion motor controller, characterized in that: It also includes a PLC connected between the potentiometer (5-1) and the ship propulsion motor controller, the PLC being connected to the ship propulsion motor controller via CAN; the PLC includes a CPU module (5-5), a digital input module (5-2), a CAN communication module (5-4), and an analog input module (5-3) with RTD resistance measurement function; the potentiometer (5-1) includes a handle (1-1) and an annular resistor (3-10) concentrically arranged on the base plate (3-10). 1) and identification ring (3-2), the annular resistor (3-1) is provided with a 1# sliding contact (3-3) and a 2# sliding contact (3-4) at the center via a rotating shaft (3-16). The 1# sliding contact (3-3) and the 2# sliding contact (3-4) are in contact with the annular resistor (3-1) and the identification ring (3-2) respectively via a 1# brush (4-2) and a 2# brush (4-1). The surface of the 2# sliding contact (3-4) in contact with the identification ring (3-2) is covered with a block-shaped insulating layer at intervals. 3-6) and a metal conductive layer (3-7), two adjacent metal conductive layers (3-7) are connected by a #1 insulated flexible wire (3-5), the end of the metal conductive layer (3-7) is connected to terminal #1 (3-8) at one end of the annular resistor (3-1) by a #2 insulated flexible wire (3-9), the other end of the annular resistor (3-1) is connected to terminal #4 (3-13), the #1 sliding contact (3-3) and the #2 sliding contact (3-4) are respectively connected by a #3 insulated flexible wire (3-6) (3-7) (3-8) (3-9 ... 14) Connect the #2 terminal (3-11) and #3 terminal (3-12) to the #4 insulated flexible wire (3-15). The #1 sliding contact (3-3) and #2 sliding contact (3-4) are fixedly connected to the handle (1-1). The #1 terminal (3-8), #2 terminal (3-11) and #4 terminal (3-13) are connected to the analog input module (5-3). The #1 terminal (3-8) and #3 terminal (3-12) are connected to the digital input module (5-2).

2. The manual speed control device for a ship propulsion motor according to claim 1, characterized in that, The area covered by the insulating layer (3-6) and the metal conductive layer (3-7) has the same arc as the gear position of the outer disc (1-3) of the potentiometer (5-1).

3. The manual speed control device for a ship propulsion motor according to claim 1, characterized in that, The 1# sliding contact (3-3) and 2# sliding contact (3-4) are both made of metal. The 1# sliding contact (3-3) and 2# sliding contact (3-4) are electrically insulated from the handle (1-1) and the rotating shaft (3-16).

4. The manual speed control device for a ship propulsion motor according to claim 1, characterized in that, The ring resistor (3-1) is made of carbon film or plastic resistor with an accuracy grade of ≤20%, and the base plate (3-10) is made of plastic insulating material.

5. A signal processing method for a manual speed control device for a ship propulsion motor as described in claim 1, characterized in that, The steps are as follows: Keep terminal 1 (3-8) grounded. Short-circuit the negative terminal M- of the analog input module (5-3) acquisition channel and the negative terminal I- of the PLC channel power supply and connect them to terminal 1 (3-8). Connect the positive terminal M+ of the analog input module (5-3) acquisition channel to terminal 2 (3-11). Connect terminal 4 (3-13) to the positive terminal I+ of the PLC channel power supply. Connect terminal 1 (3-8) to the common terminal M of the acquisition channel of the digital input module (5-2), and connect terminal 3 (3-12) to the +24V terminal of the acquisition channel of the digital input module (5-2); The analog input module (5-3) detects the resistance value between terminal 1 (3-8) and sliding contact 1 (3-3) and converts it into a digital value. R in The digital input module (5-2) detects the Boolean signal output by the recognition loop (3-2). K CPU module (5-5) output R out = (-1) K *R in ; When the adjustment of handle (1-1) is finished, then... R out With the set vehicle order threshold R LL and R UL Comparison: If R LL < R out ≤ R UL If so, then determine that the current handle (1-1) is pointing to the vehicle command; if R out < R LL or R out ≥ R UL If the current handle (1-1) is not pointing to the correct vehicle command, then it is determined that the current handle (1-1) is not pointing to the correct vehicle command; by comparison... R out And vehicle threshold R LL and R UL Determine the vehicle command that the handle (1-1) is pointing to; Vehicle order threshold R LL and R UL satisfy and Where A and B are the lower limit angles of the lever (1-1) rotated to a certain driving position. θ 1 and upper limit angle θ 2 The digital value of x% is the maximum error of the individual resistance value during the manufacturing of potentiometer (5-1), and θ is the maximum angle that the handle (1-1) can rotate. CPU module (5-5) uses Boolean signals K The rising and falling edges are used to obtain the resistance value corresponding to the initial position of a certain vehicle, calculate the angular position and corresponding rotation speed of the handle (1-1), and send the rotation speed value to the propulsion motor controller of the propulsion vessel through the CAN communication module (5-4).

6. The signal processing method for a manual speed control device for a ship propulsion motor according to claim 5, characterized in that, When the sliding contact #2 (3-4) slides from the resin insulating layer (3-6) to the metal conductive layer (3-7), the Boolean signal K undergoes a sudden change from 0 to 1; when the sliding contact #2 (3-4) slides from the metal conductive layer (3-7) to the resin insulating layer (3-6), the Boolean signal K undergoes a sudden change from 1 to 0; when the digital input module (5-2) captures the rising or falling edge of the Boolean signal K, the CPU module (5-5) reads the rising and falling edges of the resistor. R out The values ​​are then refreshed and stored in the variables respectively. R u and R d ;Will R u and R d Resistance value and vehicle order threshold R LL and R UL Compare, if the value R LL ≤ R u ≤ R UL Then choose R u The initial value R 0 Conversely, choose R d According to | R out - R 0 |Get the relative position of the handle (1-1) within a certain vehicle command range.

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