A dead-point sensor position detection system and method for marine electronically controlled diesel engines

Abstract

The present invention relates to a dead point sensor position detection system and method for a marine electronically controlled diesel engine. The system extends and connects the upper and lower dead point sensors of an electronically controlled diesel engine electronically controlled system to a security controller of a safety protection system, so that the upper and lower dead point level jump signals of the electronically controlled diesel engine detected by the upper and lower dead point sensors are sent to the security controller in addition to the electronic control system controller. The security controller calculates the time difference between the upper and lower dead point level jump signals and two speed pulse signals when the signals rise or fall, calculates the angle value according to the time difference combined with the current speed of the electronically controlled diesel engine, determines a preset angle threshold range according to a reference angle value when the electronically controlled diesel engine completes initial debugging and calibration, compares the real-time angle value of the electronically controlled diesel engine during normal operation with the preset angle threshold range, and if the real-time angle value is outside the preset angle threshold range, the position of the upper dead point sensor or the lower dead point sensor is offset.

Description

Technical Field

[0001] The invention relates to the technical field of electronically controlled diesel engines, and in particular to a dead point sensor position detection system and method for a marine electronically controlled diesel engine. Background Art

[0002] Since the 1990s, marine electronically controlled diesel engines have officially entered the practical stage. Electronically controlled diesel engines have eliminated the camshaft mechanism of traditional diesel engines. The angle timing control of fuel injection, intake, exhaust, etc. based on the design parameters of the diesel engine is completely dependent on the embedded controller of the electronic control system. Electronically controlled diesel engines usually define the top dead center position of the No. 1 cylinder of the diesel engine as the top dead center reference position of the entire machine, that is, the 0-degree crankshaft angle of the electronic control system. In order to continuously obtain the crankshaft position of the diesel engine and trigger the angle timing control, the electronic control system must be equipped with at least one non-contact top dead center sensor, and some manufacturers' electronic control systems will also be equipped with another non-contact bottom dead center sensor.

[0003] The non-contact upper / lower dead center sensor can be an inductive, Hall or other principle sensor, which is fixed to the diesel engine body through a mounting bracket. The dead center marker matching the sensor principle is fixed to the upper dead center position of the gear or flywheel side that is linked to the diesel engine crankshaft; the upper dead center mark of the electronic control system of some manufacturers' electronic diesel engines adopts the solution of missing teeth at the upper dead center position of the gear.

[0004] When the gear or flywheel rotates with the diesel engine crankshaft and the upper / lower dead center mark block or missing tooth position sweeps across the upper / lower dead center sensor sensing range, the sensor will output a level change signal. The embedded controller of the electronic control system is triggered by this level change signal and synchronizes the angle timing control algorithm to 0° or 180°.

[0005] In actual use, due to the mechanical vibration and impact generated by the operation of the marine diesel engine, the position of the upper / lower dead center sensor and its mounting bracket may be offset, causing the upper / lower dead center sensor signal to fail to correctly express the upper / lower dead center position of the diesel engine crankshaft within the allowable error range. Inaccurate upper / lower dead center sensor signals will directly lead to inaccurate timing control at various angles. Small deviations will lead to poor combustion quality in the cylinder, black smoke from the exhaust pipe, increased carbon deposits in the cylinder, and other problems. Large deviations will result in serious damage to the diesel engine.

[0006] In view of this, there is an urgent need for a method and system for determining whether the signal of the dead point sensor of a marine electronically controlled diesel engine is out of tolerance, which is used to automatically monitor and determine whether the installation positions of the upper and lower dead point sensors of the electronic control system of the marine electronically controlled diesel engine are offset. Summary of the invention

[0007] In order to solve the problem of inaccurate timing control caused by the offset of the installation position of the upper / lower dead point sensors of the electronic control system of the existing marine electronic control diesel engine, the present invention provides a dead point sensor position detection system for a marine electronic control diesel engine, by extending the upper and lower dead point sensors configured in the electronic control system of the electronic control diesel engine to the security controller of the safety protection system, so that the safety protection system can determine the time interval of the upper / lower dead point level jump signal detected by the upper and lower dead point sensors and the speed pulse signal detected by the speed sensor, and automatically monitor and determine whether the installation position of the upper and lower dead point sensors of the electronic control system of the marine electronic control diesel engine is offset. The present invention also relates to a dead point sensor position detection method for a marine electronic control diesel engine.

[0008] The technical solution of the present invention is as follows:

[0009] A dead center sensor position detection system for a marine electronically controlled diesel engine is used for detecting the position of an upper dead center sensor and a lower dead center sensor configured in an electronic control system of an electronically controlled diesel engine, wherein the upper dead center sensor and the lower dead center sensor are connected to an electronic control system controller through a first signal cable and a second signal cable, respectively, and is characterized in that it comprises a safety protection system, wherein the safety protection system is configured with a first speed sensor, a second speed sensor and a security controller,

[0010] The first signal cable and the second signal cable are extended and connected to the security controller of the safety protection system, so as to send the top dead center level jump signal and the bottom dead center level jump signal of the electronically controlled diesel engine detected by the top dead center sensor and the bottom dead center sensor to the security controller in addition to the electronic control system controller;

[0011] The first speed sensor and the second speed sensor are connected to the security controller through a third signal cable and a fourth signal cable respectively, and are used to detect the speed pulse signal of the electronically controlled diesel engine gear, and send both speed pulse signals to the security controller;

[0012] The security controller receives and processes the top dead center level jump signal, the bottom dead center level jump signal, and two speed pulse signals detected by the first speed sensor and the second speed sensor, calculates a time difference according to the time when the top dead center level jump signal, the bottom dead center level jump signal and the two speed pulse signals rise or fall, and calculates an angle value according to the time difference combined with the current speed of the electronically controlled diesel engine. The calculated angle value includes a reference angle value calculated when the electronically controlled diesel engine completes initial debugging and calibration and a real-time angle value calculated when the electronically controlled diesel engine is operating normally. A preset angle threshold range is determined according to the reference angle value calculated when the electronically controlled diesel engine completes initial debugging and calibration, and the real-time angle value calculated when the electronically controlled diesel engine is operating normally is compared with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

[0013] Preferably, the electronically controlled diesel engine comprises a crankshaft which is arranged through the electronically controlled diesel engine, a gear is sleeved on the crankshaft, and a stop point marker is provided on the surface of one side of the gear near the gear tooth position of the gear.

[0014] Preferably, the top dead center sensor and the bottom dead center sensor are respectively located on both sides of the gear and are respectively connected to the electronically controlled diesel engine through mounting brackets for detecting the top dead center level jump signal and the bottom dead center level jump signal of the stop point marker.

[0015] Preferably, the first speed sensor and the second speed sensor are respectively connected to the electronically controlled diesel engine via mounting brackets, and are respectively arranged radially pointing to the gear teeth of the gear.

[0016] Preferably, when the top dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 0 degrees, and when the bottom dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 180 degrees.

[0017] A method for detecting the position of a dead point sensor of a marine electronically controlled diesel engine, characterized in that the method comprises configuring a safety protection system with a first speed sensor, a second speed sensor and a security controller, and sending the upper dead point level jump signal and the lower dead point level jump signal of the electronically controlled diesel engine detected by the upper dead point sensor and the lower dead point sensor configured by the electronic control system of the electronically controlled diesel engine to the security controller in addition to the electronic control system controller; detecting the speed pulse signal of the gear of the electronically controlled diesel engine by the first speed sensor and the second speed sensor, and sending both the detected speed pulse signals to the security controller; then the security controller receives the upper dead point level jump signal, the lower dead point level jump signal, and the two speed pulse signals detected by the first speed sensor and the second speed sensor, and processes them The time difference is calculated according to the time when the top dead center level jump signal, the bottom dead center level jump signal and the two speed pulse signals detected by the first speed sensor and the second speed sensor when the signal rises or falls, and the angle value is calculated according to the time difference combined with the current speed of the electronically controlled diesel engine. The calculated angle value includes a reference angle value calculated when the electronically controlled diesel engine completes the initial debugging and calibration and a real-time angle value calculated when the electronically controlled diesel engine is operating normally; the security controller determines a preset angle threshold range according to the reference angle value when the electronically controlled diesel engine completes the initial debugging and calibration, and compares the real-time angle value when the electronically controlled diesel engine is operating normally with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

[0018] Preferably, the real-time angle value is calculated when the electronically controlled diesel engine is operating normally. When the moment of the level rising edge change is used as the trigger condition, the first time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, the second time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor, the third time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, and the fourth time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor are calculated respectively, and each time difference is combined with the current speed of the electronically controlled diesel engine to calculate the corresponding four real-time angle values.

[0019] Preferably, the reference angle value is calculated when the electronically controlled diesel engine completes the initial debugging and calibration. When the diesel engine completes the initial debugging and calibration to ensure that the upper and lower dead point sensors are installed accurately, the security controller automatically detects the fifth time difference, the sixth time difference, the seventh time difference and the eighth time difference from the rising edge moment of the timing upper and lower dead point level jump signal to the rising edge moment of the speed pulse signal detected by the first and second speed measuring sensors, respectively, and calculates each time difference in combination with the current speed of the electronically controlled diesel engine to obtain the corresponding four reference angle values; the four real-time angle values ​​during the normal operation of the electronically controlled diesel engine are compared with the corresponding four reference angle values, and the angle deviation value is calculated, so as to determine whether the position of the upper and lower dead point sensors of the electronic control system of the marine electronically controlled diesel engine is offset.

[0020] Preferably, after the diesel engine completes initial debugging and calibration, ensuring that the upper and lower dead center sensors are installed accurately is to set the initial crankshaft angle of the electronically controlled diesel engine to 0 degrees when the upper dead center level jump signal is on the rising edge, and to set the initial crankshaft angle of the electronically controlled diesel engine to 180 degrees when the lower dead center level jump signal is on the rising edge.

[0021] Preferably, after determining that the position of the top dead center sensor or the bottom dead center sensor is offset, a corresponding protection action that meets safety requirements is performed according to the determination result.

[0022] The technical effects of the present invention are as follows:

[0023] The present invention provides a dead point sensor position detection system for a marine electronically controlled diesel engine, which is used for detecting the position of an upper dead point sensor and a lower dead point sensor configured in an electronic control system of an electronically controlled diesel engine. The upper dead point sensor and the lower dead point sensor are connected to an electronic control system controller through a first signal cable and a second signal cable, respectively. The safety protection system is configured with a first speed sensor, a second speed sensor and a security controller. The first signal cable and the second signal cable are extended and connected to the security controller of the safety protection system, so that the upper dead point level jump signal and the lower dead point level jump signal of the electronically controlled diesel engine detected by the upper dead point sensor and the lower dead point sensor are sent to the security controller in addition to the electronic control system controller. The first speed sensor and the second speed sensor detect the speed pulse signal of the gear of the electronically controlled diesel engine, and both the detected two speed pulse signals are sent to the security controller. The security controller detects the speed pulse signal of the gear of the electronically controlled diesel engine, and sends the two detected speed pulse signals to the security controller. The time difference is calculated according to the time when the top dead point level jump signal, the bottom dead point level jump signal and the two speed pulse signals detected by the first speed sensor and the second speed sensor rise or fall, the angle value is calculated according to the time difference combined with the current speed of the electronically controlled diesel engine, the preset angle threshold range is determined according to the reference angle value when the electronically controlled diesel engine completes the initial debugging and calibration, the real-time angle value of the electronically controlled diesel engine during normal operation is compared with the preset angle threshold range, if the real-time angle value is outside the preset angle threshold range, the position of the top dead point sensor or the bottom dead point sensor is offset, which is particularly suitable for distinguishing the top / bottom dead point sensors of the electronic control system of a marine electronically controlled diesel engine, and whether the top / bottom dead point sensor installation position is offset due to mechanical vibration and impact, whether the top / bottom dead point sensor signal can meet the requirements of correctly expressing the top / bottom dead point position of the diesel engine crankshaft within the allowable error range.

[0024] The present invention is suitable for automatically monitoring and determining whether the installation position of the upper / lower dead center sensor of the electronic control system of a marine electronic diesel engine is offset. In actual ship applications, in addition to the electronic control system of the electronic diesel engine itself, an independent safety protection system must be configured externally. The present invention uses the external safety protection system that must be configured in the actual application of the electronic diesel engine to expand its functions, and connects the upper / lower dead center sensor signal of the electronic control system to the security controller of the safety protection system. The safety controller automatically monitors and determines whether the installation position of the upper / lower dead center sensor of the electronic control system of the marine electronic diesel engine is offset by judging the time interval of the signal level change, so that corresponding protection actions can be performed according to the judgment result and safety requirements. The present invention also relates to a method for detecting the position of a dead point sensor of a marine electronically controlled diesel engine. The method corresponds to the above-mentioned dead point sensor position detection system for a marine electronically controlled diesel engine, and can be understood as a method for realizing the above-mentioned dead point sensor position detection system for a marine electronically controlled diesel engine. The existing electronically controlled diesel engine uses the upper and lower dead point sensors of its own electronic control system to measure the level jump signal of the electronically controlled diesel engine, and an externally configured independent safety protection system measures the speed pulse signal. The function is expanded by extending the upper and lower dead point sensors of the electronic control system to be connected to the security controller, so that the safety protection system can quickly and accurately automatically monitor and determine whether the installation position of the upper and lower dead point sensors of the electronic control system of the marine electronically controlled diesel engine is offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of the structure of the dead point sensor position detection system for a marine electronically controlled diesel engine.

[0026] Figure 2 The figure is a schematic diagram of electrical signals of a dead point sensor position detection system for a marine electronically controlled diesel engine according to the present invention.

[0027] Figure 3 It is a schematic diagram of a partial enlargement of the electrical signal of the dead point sensor position detection system for a marine electronically controlled diesel engine of the present invention.

[0028] Figure 4 The present invention is a flow chart of a method for detecting the position of a dead point sensor of a marine electronically controlled diesel engine.

[0029] The reference numbers in the figure are listed as follows:

[0030] 1-electronically controlled diesel engine, 11-crankshaft, 12-gear, 13-dead point marker, 2-top dead point sensor, 3-bottom dead point sensor, 4-first speed sensor, 5-second speed sensor, 6-electronic control system controller, 7-security controller, 8-mounting bracket, 9-electronic control system, 10-safety protection system. DETAILED DESCRIPTION

[0031] In order to more clearly understand the content of the present invention, it will be described in detail with reference to the drawings and embodiments.

[0032] The present invention relates to a dead-point sensor position detection system for a marine electronically controlled diesel engine. The system expands the functions of an existing electronically controlled diesel engine by using upper and lower dead-point sensors of an electronically controlled system to measure a level jump signal of the electronically controlled diesel engine and an externally configured independent safety protection system to measure a rotation speed pulse signal. By extending and connecting the upper and lower dead-point sensors of the electronically controlled system to a security controller of a safety protection unit, the safety protection system can automatically monitor and determine whether the installation positions of the upper and lower dead-point sensors of the electronic control system of the marine electronically controlled diesel engine are offset.

[0033] Specifically, Figure 1 As shown, the system is used to detect the position of the top dead center sensor 2 and the bottom dead center sensor 3 configured for the electronic control system 9 of the electronic control diesel engine 1, and includes a safety protection system 10. The top dead center sensor 2 and the bottom dead center sensor 3 are connected to the electronic control system controller 6 (such as Figure 1 The No. 1 controller, No. 2 controller ... No. n controller) in the electronic control system 9 shown in the figure, the safety protection system 10 is equipped with a first speed sensor 4, a second speed sensor 5 and a security controller 7, and the first signal cable and the second signal cable are extended and connected (dashed lines in the figure) to the security controller 7 of the safety protection system 10, so as to send the top dead center level jump signal (TDC signal) and the bottom dead center level jump signal (BDC signal) of the electronically controlled diesel engine 1 detected by the top dead center sensor 2 and the bottom dead center sensor 3 to the electronic control system controller 6 and also to the security controller 7; the first speed sensor 4 and the second speed sensor 5 are respectively connected to the security controller 7 through the third signal cable and the first signal cable. Four signal cables are connected to the security controller 7, which are used to detect the speed pulse signal of the gear of the electronically controlled diesel engine 1, and send both speed pulse signals (PULSE1 signal and PULSE2 signal) to the security controller 7; the electronically controlled diesel engine 1 includes a crankshaft 11 which is arranged throughout the electronically controlled diesel engine 1, a gear 12 is sleeved on the crankshaft 11, and a stop mark 13 is arranged on the surface of one side of the gear 12 at the position of the gear teeth close to the gear 12, and the upper stop point sensor 2 and the lower stop point sensor 3 are respectively located on both sides of the gear 12, and are respectively connected to the electronically controlled diesel engine 1 through the mounting bracket 8, and are used to detect the upper stop point level jump signal and the lower stop point level jump signal of the stop point marker 13. When the electronically controlled diesel engine 1 is running, it will drive the gear 12 and the stop point marker 13 to rotate together. When the stop point marker 13 passes through the area that can be detected by the upper stop point sensor 2, a signal with a level change will be generated, and when the stop point marker passes through the area that can be detected by the lower stop point sensor 3, a signal with a level change will also be generated.

[0034] It should be noted that when the crankshaft 11 is set on the electronically controlled diesel engine 1, one end of the crankshaft 11 is a free end and the other end is a thrust output end. The gear 12 can be set on the free end of the crankshaft 11, or on the thrust output end of the crankshaft 11, or at any position between the free end and the thrust output end of the crankshaft 11.

[0035] The electronically controlled diesel engine 1 is usually equipped with at least two speed sensors. The first speed sensor 4 and the second speed sensor 5 are respectively connected to the electronically controlled diesel engine 1 through the mounting bracket 8, and are radially pointed to the gear teeth of the gear 12. When the electronically controlled diesel engine is running, it will drive the gear 12 to rotate. The first speed sensor and the second speed sensor will generate two speed pulse signals as the gear teeth on the gear 12 rotate.

[0036] The electronic control system 9 includes one or more electronic control system controllers 6. The top dead center sensor 2 and the bottom dead center sensor 3 are connected to each electronic control system controller 6 through a first signal cable and a second signal cable respectively. The electronic control system controller 6 is used to process the top dead center level jump signal sent by the top dead center sensor 2 and the bottom dead center level jump signal sent by the bottom dead center sensor 3, and synchronize the angle value of the crankshaft angle of the electronic control diesel engine according to the top dead center level jump signal and the bottom dead center level jump signal, and then determine the initial crankshaft angle of the electronic control diesel engine; wherein, when the top dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronic control diesel engine is 0 degrees, and when the bottom dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronic control diesel engine is 180 degrees.

[0037] The security controller 7 of the safety protection system 10 can simultaneously obtain two speed pulse signals, the top dead center level jump signal and the bottom dead center level jump signal. The security controller of the safety protection system 10 can obtain the speed n (in rpm) of the continuously running electronically controlled diesel engine in real time based on one speed pulse signal, and can obtain the direction of the continuously running electronically controlled diesel engine in real time based on two speed pulse signals. The security controller processes the four received signals, calculates the time difference according to the time when the top dead center level jump signal, the bottom dead center level jump signal and the two speed pulse signals rise or fall, and calculates the angle value according to the time difference combined with the current speed of the electronically controlled diesel engine. The calculated angle value includes a reference angle value calculated when the electronically controlled diesel engine completes the initial debugging and calibration and a real-time angle value calculated when the electronically controlled diesel engine is operating normally. A preset angle threshold range is determined according to the reference angle value calculated when the electronically controlled diesel engine completes the initial debugging and calibration, and the real-time angle value calculated when the electronically controlled diesel engine is operating normally is compared with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

[0038] Specifically, the changing moment of the level rising edge can be used as the trigger condition, referring to Figure 2 and Figure 3 In the first half of the timing sequence, the first time difference t1 (unit S) is the time difference from the rising edge moment of the top dead point level jump signal (i.e., TDC signal) to the rising edge moment of the speed pulse signal (i.e., PULSE1 signal) detected by the first speed sensor, and the second time difference t2 (unit S) is the time difference from the rising edge moment of the top dead point level jump signal (i.e., TDC signal) to the rising edge moment of the speed pulse signal (i.e., PULSE2 signal) detected by the second speed sensor; refer to Figure 2 and Figure 3 In the second half of the timing, the third time difference t3 (unit S) is the time difference from the rising edge moment of the bottom dead point level jump signal (i.e., BDC signal) to the rising edge moment of the speed pulse signal (i.e., PULSE1 signal) detected by the first speed sensor, and the fourth time difference t4 (unit S) is the time difference from the rising edge moment of the bottom dead point level jump signal (i.e., BDC signal) to the rising edge moment of the speed pulse signal (i.e., PULSE2 signal) detected by the second speed sensor.

[0039] Convert the time differences t1, t2, t3, t4 to the corresponding angle values ​​θ1, θ2, θ3, θ4 according to the following formula:

[0040] θ= 360×n÷60×t (1)

[0041] In the above formula, n is the speed of the electronically controlled diesel engine.

[0042] After the electronically controlled diesel engine has completed initial debugging and calibration, and the installation positions of the upper and lower dead center sensors are ensured to be accurate (i.e., when the upper dead center level jump signal detected by the upper dead center sensor is at the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 0 degrees, and when the lower dead center level jump signal detected by the lower dead center sensor is at the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 180 degrees, which can accurately express the upper and lower dead center positions of the diesel engine crankshaft), the software function of the security controller is expanded by turning the engine or continuously running the electronically controlled diesel engine, and the program automatically detects and times the time difference (fifth time difference, sixth time difference, seventh time difference and eighth time difference) t5, t6, t7, t8 from the rising edge of the upper and lower dead center level jump signal to the rising edge of the PULSE1 / PULSE2 signal in turn, and converts them into angle values ​​θ5, θ6, θ7, θ8 according to formula (1), and records them in the security controller as reference angle values, and determines the preset angle threshold range according to the reference angle values ​​θ5, θ6, θ7, θ8.

[0043] During the subsequent normal operation of the electronically controlled diesel engine, the program automatically detects and times the time difference t1, t2, t3, t4 from the rising edge of the upper and lower dead point level jump signal to the rising edge of the PULSE1 / PULSE2 signal, and converts them into angle values ​​θ1, θ2, θ3, θ4 according to formula (1). The measured real-time angle values ​​θ1, θ2, θ3, θ4 are compared with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, for example, the real-time angle value is outside the range of θ5±0.1°, θ6±0.1°, θ7±0.1°, θ8±0.1°, the position of the upper dead point sensor or the lower dead point sensor is offset. If the real-time angle value is within the preset angle threshold range, the position of the upper dead point sensor or the lower dead point sensor is normal. In addition, corresponding protection actions that meet safety requirements can be executed based on the comparison results.

[0044] It should be noted that the changing time of the level jump signals of the upper and lower dead point sensors and the signal changing time of the two speed pulse signals are not limited to the changing time of the rising edge of the level as the trigger condition, but can also be the changing time of the falling edge of the level as the trigger condition, and the calculation principle is the same.

[0045] In addition, extending the upper and lower dead point sensors of the electronic control system to the security controller of the safety protection system is not limited to direct connection through signal cables, but can also be connected via a signal regeneration device; it is also not limited to connecting to the security controller of the safety protection system, but can also be connected to other systems or other controllers.

[0046] The present invention also relates to a method for detecting the position of a dead point sensor of a marine electronically controlled diesel engine. The method corresponds to the above-mentioned dead point sensor position detection system of a marine electronically controlled diesel engine, and can be understood as a method for realizing the above-mentioned dead point sensor position detection system of a marine electronically controlled diesel engine. Figure 4 As shown in the flow chart, the method comprises: using the top dead point sensor and the bottom dead point sensor configured by the electronic control system of the electronic control diesel engine to detect the top dead point level jump signal and the bottom dead point level jump signal of the electronic control diesel engine, and sending the detected top dead point level jump signal and the bottom dead point level jump signal to the security controller configured by the safety protection system in addition to the electronic control system controller; the safety protection system is also configured with a first speed sensor and a second speed sensor, the first speed sensor and the second speed sensor detect the speed pulse signal of the gear of the electronic control diesel engine, and the two detected speed pulse signals are sent to the security controller;

[0047] Then the security controller receives the top dead center level jump signal, the bottom dead center level jump signal, and two speed pulse signals detected by the first speed sensor and the second speed sensor and processes them, calculates the time difference according to the time when the top dead center level jump signal, the bottom dead center level jump signal and the two speed pulse signals detected by the first speed sensor and the second speed sensor rise or fall, and calculates the angle value according to the time difference combined with the current speed of the electronically controlled diesel engine, the calculated angle value includes the reference angle value calculated when the electronically controlled diesel engine completes the initial debugging and calibration and the real-time angle value calculated when the electronically controlled diesel engine is operating normally; the security controller determines the preset angle threshold range according to the reference angle value when the electronically controlled diesel engine completes the initial debugging and calibration, and compares the real-time angle value when the electronically controlled diesel engine is operating normally with the preset angle threshold range, if the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

[0048] Preferably, the real-time angle value is calculated when the electronically controlled diesel engine is operating normally. Assuming that the moment of the level rising edge change is used as the trigger condition, the first time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, the second time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor, the third time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, and the fourth time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor are calculated respectively, and each time difference is combined with the current speed of the electronically controlled diesel engine to calculate the corresponding four real-time angle values.

[0049] Preferably, the reference angle value is calculated when the electronically controlled diesel engine completes the initial debugging and calibration. When the diesel engine completes the initial debugging and calibration to ensure that the upper and lower dead point sensors are installed accurately, the security controller automatically detects the fifth time difference, the sixth time difference, the seventh time difference and the eighth time difference from the rising edge moment of the timing upper and lower dead point level jump signal to the rising edge moment of the speed pulse signal detected by the first and second speed measuring sensors, respectively, and calculates each time difference in combination with the current speed of the electronically controlled diesel engine to obtain the corresponding four reference angle values; the four real-time angle values ​​during the normal operation of the electronically controlled diesel engine are compared with the corresponding four reference angle values, and the angle deviation value is calculated, so as to determine whether the position of the upper and lower dead point sensors of the electronic control system of the marine electronically controlled diesel engine is offset.

[0050] Preferably, after the diesel engine completes initial debugging and calibration, ensuring that the upper and lower dead center sensors are installed accurately is to set the initial crankshaft angle of the electronically controlled diesel engine to 0 degrees when the upper dead center level jump signal is on the rising edge, and to set the initial crankshaft angle of the electronically controlled diesel engine to 180 degrees when the lower dead center level jump signal is on the rising edge.

[0051] Preferably, after determining that the position of the top dead center sensor or the bottom dead center sensor is offset, a corresponding protection action that meets safety requirements is performed according to the determination result.

[0052] The present invention provides a dead-point sensor position detection system and method for a marine electronically controlled diesel engine. By extending and connecting the upper and lower dead-point sensors configured in the electronic control system of the electronically controlled diesel engine to the security controller of the safety protection system, the safety protection system can determine the time interval between the upper and lower dead-point level jump signals detected by the upper and lower dead-point sensors and the changes in two speed pulse signals detected by the first speed sensor and the second speed sensor, and automatically monitor and determine whether the installation positions of the upper and lower dead-point sensors of the electronic control system of the marine electronically controlled diesel engine are offset. The system and method are particularly suitable for determining whether the upper / lower dead-point sensors of the electronic control system of the marine electronically controlled diesel engine are offset due to mechanical vibration and impact, and whether the upper / lower dead-point sensor signals can meet the requirements of correctly expressing the upper / lower dead-point positions of the crankshaft of the diesel engine within the allowable error range.

[0053] It should be noted that the above-described specific implementations can enable those skilled in the art to more fully understand the invention, but do not limit the invention in any way. Therefore, although this specification has described the invention in detail with reference to the drawings and embodiments, those skilled in the art should understand that the invention can still be modified or replaced by equivalents. In short, all technical solutions and improvements that do not deviate from the spirit and scope of the invention should be included in the protection scope of the patent for the invention.

Claims

1. A dead center sensor position detection system for a marine electronically controlled diesel engine, used for detecting the position of a top dead center sensor and a bottom dead center sensor configured in an electronic control system of an electronically controlled diesel engine, wherein the top dead center sensor and the bottom dead center sensor are connected to an electronic control system controller through a first signal cable and a second signal cable, respectively, and characterized in that: The invention comprises a safety protection system, wherein the safety protection system is equipped with a first speed sensor, a second speed sensor and a security controller. The first signal cable and the second signal cable are extended and connected to the security controller of the safety protection system, so as to send the top dead center level jump signal and the bottom dead center level jump signal of the electronically controlled diesel engine detected by the top dead center sensor and the bottom dead center sensor to the security controller in addition to the electronic control system controller; The first speed sensor and the second speed sensor are connected to the security controller through a third signal cable and a fourth signal cable respectively, and are used to detect the speed pulse signal of the electronically controlled diesel engine gear, and send both speed pulse signals to the security controller; The security controller receives and processes the top dead center level jump signal, the bottom dead center level jump signal, and two speed pulse signals detected by the first speed sensor and the second speed sensor, calculates a time difference according to the time when the top dead center level jump signal, the bottom dead center level jump signal and the two speed pulse signals rise or fall, and calculates an angle value according to the time difference combined with the current speed of the electronically controlled diesel engine. The calculated angle value includes a reference angle value calculated when the electronically controlled diesel engine completes initial debugging and calibration and a real-time angle value calculated when the electronically controlled diesel engine is operating normally. A preset angle threshold range is determined according to the reference angle value calculated when the electronically controlled diesel engine completes initial debugging and calibration, and the real-time angle value calculated when the electronically controlled diesel engine is operating normally is compared with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

2. The dead center sensor position detection system for a marine electronically controlled diesel engine according to claim 1, characterized in that: The electronically controlled diesel engine comprises a crankshaft which is arranged through the electronically controlled diesel engine, a gear is sleeved on the crankshaft, and a stop point marker is arranged on the surface of one side of the gear near the gear tooth position of the gear.

3. The dead center sensor position detection system for a marine electronically controlled diesel engine according to claim 2, characterized in that: The top dead center sensor and the bottom dead center sensor are respectively located on both sides of the gear and are respectively connected to the electronically controlled diesel engine through mounting brackets for detecting the top dead center level jump signal and the bottom dead center level jump signal of the stop point marker.

4. The dead center sensor position detection system for a marine electronically controlled diesel engine according to claim 3, characterized in that: The first speed sensor and the second speed sensor are respectively connected to the electronically controlled diesel engine through mounting brackets, and are respectively arranged radially pointing to the gear teeth of the gear.

5. The dead center sensor position detection system for a marine electronically controlled diesel engine according to claim 3, characterized in that: When the top dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 0 degrees, and when the bottom dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 180 degrees.

6. A method for detecting the position of a dead-point sensor of a marine electronically controlled diesel engine, characterized in that: The method comprises configuring a safety protection system with a first speed sensor, a second speed sensor and a security controller, and sending the top dead point level jump signal and the bottom dead point level jump signal of the electronically controlled diesel engine detected by the top dead point sensor and the bottom dead point sensor configured by the electronic control system of the electronically controlled diesel engine to the security controller in addition to the electronic control system controller; detecting the speed pulse signal of the gear of the electronically controlled diesel engine by the first speed sensor and the second speed sensor, and sending both the detected two speed pulse signals to the security controller; then the security controller receives the top dead point level jump signal, the bottom dead point level jump signal, and the two speed pulse signals detected by the first speed sensor and the second speed sensor and processes them, and calculates the time difference according to the time when the top dead point level jump signal, the bottom dead point level jump signal and the two speed pulse signals detected by the first speed sensor and the second speed sensor when the signal rises or falls, and calculates the angle value according to the time difference combined with the current speed of the electronically controlled diesel engine, and the angle value calculated includes the reference angle value calculated when the electronically controlled diesel engine completes the initial debugging and calibration and the real-time angle value calculated when the electronically controlled diesel engine is operating normally; The security controller determines the preset angle threshold range based on the reference angle value when the electronically controlled diesel engine completes the initial debugging and calibration, and compares the real-time angle value during normal operation of the electronically controlled diesel engine with the preset angle threshold range. If the real-time angle value is outside the preset angle threshold range, the position of the top dead center sensor or the bottom dead center sensor is offset.

7. The method for detecting the position of a dead-point sensor of a marine electronically controlled diesel engine according to claim 6, characterized in that: The real-time angle value is calculated when the electronically controlled diesel engine is operating normally. When the moment of the level rising edge change is used as the trigger condition, the first time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, the second time difference from the rising edge moment of the top dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor, the third time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the first speed sensor, and the fourth time difference from the rising edge moment of the bottom dead center level jump signal to the rising edge moment of the speed pulse signal detected by the second speed sensor are calculated respectively, and each time difference is combined with the current speed of the electronically controlled diesel engine to calculate the corresponding four real-time angle values.

8. The method for detecting the position of a dead-point sensor of a marine electronically controlled diesel engine according to claim 7, characterized in that: The reference angle value is calculated when the electronically controlled diesel engine completes the initial debugging and calibration. When the diesel engine completes the initial debugging and calibration and ensures that the upper and lower dead point sensors are accurately installed, the security controller automatically detects the fifth, sixth, seventh and eighth time differences from the rising edge of the timing upper and lower dead point level jump signal to the rising edge of the speed pulse signal detected by the first and second speed measuring sensors, respectively, and calculates the corresponding four reference angle values ​​by combining each time difference with the current speed of the electronically controlled diesel engine; The four real-time angle values ​​of the electronically controlled diesel engine during normal operation are compared with the corresponding four reference angle values, and the angle deviation value is calculated to determine whether the upper and lower dead center sensor positions of the electronic control system of the marine electronically controlled diesel engine are offset.

9. The method for detecting the position of the dead point sensor of a marine electronically controlled diesel engine according to claim 8, characterized in that: After the diesel engine completes the initial commissioning and calibration, ensure that the upper and lower dead center sensors are installed accurately. When the upper dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 0 degrees, and when the lower dead center level jump signal is on the rising edge, the initial crankshaft angle of the electronically controlled diesel engine is 180 degrees.

10. The method for detecting the position of a dead-point sensor of a marine electronically controlled diesel engine according to claim 6, characterized in that: After determining that the position of the top dead center sensor or the bottom dead center sensor is offset, a corresponding protection action that meets safety requirements is performed according to the determination result.

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