KR940009541B1 - Apparatus and method of watching for driving of diesel engine - Google Patents

Abstract

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Description

Operation monitoring device and control method of diesel engine

1 is an implementation circuit diagram of a driving monitoring apparatus according to the present invention.

2 is a flowchart of an initialization routine showing an operating state according to the present invention.

3 is a flowchart of an interrupt routine performed at regular intervals in accordance with the present invention.

4 is a main flowchart showing an operation control method according to the present invention.

* Explanation of symbols for the main parts of the drawings

1, 2, 3, 4, 5, 17: filter 6: waveform shaping circuit

7: microprocessor unit 8: indicator driving circuit

9 display device 10 power amplifier

11 nonvolatile memory 12 first constant voltage circuit

13: second constant voltage circuit 14, 15, 16: diode

18: rotation sensor 19: temperature sensor

20: pressure sensor 21: function selection switch

22: setting switch 23: solenoid

24: buzzer 25: power supply switch

26: DC power supply 27: engine generator for charging

28: sensor unit 29: operation switch unit

30: power supply circuit 31: engine stop circuit

33, 34, 35,... , 79: Step RT1: Determination of installation condition and setting routine

RT5: Engine rpm routine RT6: Engine overspeed judgment routine

RT7: Engine Fault Handling Routine

The present invention is connected to the various sensors of the diesel engine to continuously monitor the engine speed, the temperature of the coolant, the pressure of the lubricating oil to recognize the user in the event of an engine abnormality to take the necessary measures and at the same time more than the set time In case of an abnormal condition of the engine, the engine stops the engine and displays the engine's total operation time, overspeed operation time, etc., and displays the engine speed, current time, elapsed time after the specified time, and accumulated operation time. The present invention relates to an operation monitoring apparatus for a diesel engine and an operation control method thereof, which can effectively display a back light.

In general, diesel engines have a rated rated RPM (Rated RPM), which is specified by the manufacturer in consideration of performance and service life, depending on the application, and immediately after the engine is runaway due to an abnormality in the engine fuel injection control system. There are dangerous RPMs that can damage related components, which prevents the use of more than the specified rotational speed. Various sensors are installed to monitor the engine's normal operation.

However, since diesel engines, which are widely used in industrial machinery or marine transportation machines, require almost constant engine speed, the operator can control the driving of the engine while monitoring the operating conditions of the engine. It is not.

Therefore, diesel engines are often unable to cope with abnormal operating conditions caused by internal and external factors of the engine because the operator does not continuously monitor the operating conditions.

Therefore, in order to solve such a problem, a warning device indicating a simple speed meter, a running meter, a coolant overheating, or an engine oil pressure drop has been used. Because this method performs individual and simple functions, each of the following problems arises.

(1) In general, the mechanical rotation system uses a rotation transmission medium such as a wire cable and a running time totalizer by a gear device in order to monitor the rotation speed of the engine, but there is a problem in the complexity and durability of the mechanical drive unit compared to a simple display function. There is a limit of display accuracy.

(2) When using an electronic tachometer to monitor the engine speed, a separate device that drives the solenoid to operate the cumulative counter at regular intervals regardless of engine rotation when the engine is powered on for integration of the operating time. I'm using.

(3) In addition, the above methods had only a simple display function, so that the operator should always observe the eyesight of the operator.

The present invention is to solve such a problem, an object of the present invention is to measure the number of revolutions of the engine when the rated speed exceeds the set flashing and alarm sound and when the dangerous speed exceeds, In the event of overheating and abnormal lubrication of the engine, display the contents and output the alarm sound, give the engine time to take action, and monitor the operation of the diesel engine that can stop the engine after the action time has elapsed. An apparatus and a control method thereof are provided.

The other purpose is to sequentially perform the function of displaying the current time, elapsed time and operation time which is helpful for the operation of the engine, and the number of output pulses per speed, overspeed, risk of operation by the operation switch unit. An object of the present invention is to provide a diesel engine operating monitoring apparatus and a control method thereof.

Another object is to provide a diesel engine operation monitoring device and a control method thereof, which store the operation time and the overspeed operation time as data after a certain time and prevent the loss of data even when the power is cut off.

Features of the present invention for achieving the above object is a sensor unit provided with a rotation sensor, a temperature sensor, a pressure sensor, and the operation switch unit for setting the conditions of each sensor in the sensor unit and each detected by the sensor unit A circuit comprising a microprocessor unit for comparing a sensing value of and a value set by an operation switch unit, comprising: a display connected through an indicator driving circuit to output data on an operation state and time of an engine detected by the microprocessor unit; Display means composed of a device, an engine stop means and an acoustic alarm means adapted to consist of a solenoid and a buzzer to which a duplicate signal is applied through a power amplifier in an abnormal state of the engine in the microprocessor unit, and in the microprocessor unit A fire that allows you to store the engine's running time every hour And a speech memory, to which the operation monitoring apparatus of a diesel engine provided by a power supply circuit for supplying respective independent power supply to said display driver circuit and a microprocessor unit.

Another feature is to determine whether the function switch is selected or not, to display the number of revolutions, current time, elapsed time, operation time, and to reset the current time and elapsed timer. And an engine speed determination routine for reading a rotation pulse of the rotation sensor and a reference pulse inside the microprocessor unit, and then calculating the engine speed to obtain the engine speed value, and determining the engine speed. Engine speed determination routine for outputting a warning signal by performing dangerous speed and speed determination based on the engine speed value obtained in the routine, whether the dangerous speed exceeded in the engine speed determination routine, and whether the temperature sensor and the pressure sensor are abnormal Operation monitoring of the diesel engine, which consists of an engine abnormal condition processing routine that detects and stops the engine when an engine abnormal condition occurs. It will air on the way.

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention.

1 is a circuit diagram illustrating an operation and monitoring apparatus according to the present invention. The sensor unit 28 mounted on an engine unit of a diesel engine includes a rotation sensor 18 for detecting an engine rotation state, and an engine overheating state. Temperature sensor 19 for detecting the pressure, the pressure sensor 20 for detecting the pressure state of the lubricating oil is attached.

And each of the rotation sensor 18, the temperature sensor 19, the pressure sensor 20 is connected to the filter (1), (2), (3) for removing noise generated from the output of the sensor and the filter ( 1), (2) and (3) consist of a low pass filter.

The output of the filter 1 connected to the rotation sensor 18 is configured to be applied in the microprocessor unit 7 via the waveform shaping circuit 6. The microprocessor unit 7 includes a central processing unit (CPU), a memory unit, a counter, a timer, an input / output port, and the like. In the operation switch unit 29, a function selection switch 21 for selecting functions such as an engine speed display, an operation time display, a current time display, an elapsed time display, and the rotation sensor output pulse number setting per revolution, and an overspeed rotation speed A setting switch 22 is used for setting the setting, setting the dangerous rotation speed, setting the current time, resetting the elapsed time, and the like.

The outputs of the function selection switches 21 and the setting switches 22 are connected to the microprocessor unit 7 via the filters 4 and 5.

The filters (4) and (5) comprise a low pass filter for controlling noise generated during switch operation.

One side output of the microprocessor unit 7 is connected to the display device 9 via the indicator driving circuit 8 to display various function times, the engine speed, and the engine abnormal state. . The engine stop circuit 31 connected to the microprocessor unit 7 may operate only the buzzer 24 through the power amplifier 10 or operate the buzzer 24 and the solenoid 23 at the same time in an abnormal state of the engine. In this configuration, the solenoid 23 includes means for stopping the operation of the engine 27.

DC power supply 26 for supplying power to the engine 27 and the operation and monitoring device is applied to the power supply circuit 30 through the power supply switch 25 and the low pass filter 17 for noise cancellation through the second passage. It is configured to be applied to the power supply circuit 30 directly through the first passage.

The power of the power supply circuit 30 is applied to the first constant voltage circuit 12 to one side through diodes 14, 15, and 16 to supply power VCC1 to the microprocessor unit 7. And a second passage for supplying the power supply VCC2 to the display driving circuit 8 via the diode 16 and the second constant voltage circuit 13 on the other side.

Reference numeral 11 denotes a nonvolatile memory 11 connected to the microprocessor unit 7, which not only stores the operating state of the engine in the nonvolatile memory 11 but also stores the operating state of the engine in the microprocessor unit 7. It is possible to read the data stored in) and use E ² PROM or NVRAM to prevent the loss of stored data even when the power is off.

2 is a flowchart of an initialization routine showing an operation state according to the present invention, after the rotation sensor reference pulse table system 35 indicating the number of output pulses of the rotation sensor per revolution of the engine before initialization when the power is turned on, It consists of the setting routine (RT1) and the engine state determination routine (RT2), and the reference pulse, speed, and dangerous rotation speed of the rotation sensor required for the installation judgment and calculation of the rotation speed in the setting routine (RT1) when the engine is first installed. In the engine state determination routine RT2, steps are included for moving the engine to the main program during operation and for operating the function switches in the engine stop state.

FIG. 3 repeats every routine so that routines performed at regular intervals in accordance with the present invention are operated separately from the flowcharts of FIG. 2 and FIG. 4 as flowcharts.

In this flow, the accumulation of the reference pulse and the accumulation of the reference time are performed to perform operations related to the timer. (RT ₃ ) or display step 50 is performed.

4 is a main flowchart showing the operation control method according to the present invention, when the main program is executed, a function of determining whether the engine operation and other timer-related operations (speeding time, dangerous rotation speed, clock, etc.) are selected A selection and setting determination routine (RT4), an engine speed determination routine (RT5) for calculating the engine speed after performing the function selection and setting determination routine (RT4), and the engine speed determination routine (RT5). Engine overspeed determination routine (RT6) for determining whether the overspeed operation is based on the calculated engine speed (RPM), and during overspeed operation and other abnormal states of the engine (overheating) determined by the engine overspeed determination routine (RT6). Engine abnormal state processing routine (RT7) which takes the protective action of the engine after determining the lubricating oil pressure decrease), and has a storage system 79 in a nonvolatile memory for storing the operating state of the engine after a certain time.

In the present invention configured as described above, when the power supply switch 25 is improved, since the DC power supply 26 is applied to the first constant voltage circuit 12 through the diode 14, the first constant voltage circuit 12 supplies the power supply VCC1. ) Is applied to the microprocessor unit 7 so that the internal timer can perform the continuous operation even in normal times.

In order to monitor the operation of the diesel engine, when the engine 27 is operated and the power supply switch 25 is connected, the power source from which the noise is removed from the filter 17 is connected to the first constant voltage circuit through the diodes 15 and 16. The power applied to the microprocessor unit 7 to supply the power supply VCC1 to the microprocessor unit 7, and the power applied to the second constant voltage circuit 13 through the diode 16 is maintained at a constant constant voltage. Is applied to the indicator drive 횔 8.

Initially, the engine is started by the power supplied from the DC power supply 26 of the engine, and after the engine is driven, the DC power supply 26 is charged through the generator 27 for charging the engine.

When the engine operates normally by performing such an operation, the engine state is detected by each sensor of the sensor unit 28.

Of course, the operation monitoring device is operated by the initialization routing of FIG. 2 in the state in which the engine is not operated after the power supply is initially turned on, and performs the initial installation condition determination and the setting routine RT1.

When driving the engine for the first time, each of the various sensors and the operation switch unit 29 is set in order to set the installation conditions such as the reference pulse number, the overspeed rotation speed and the dangerous rotation speed of the engine sensor at the first installation. When the power is turned on in the state where each specific state is operated with the switch of, the installation information setting step 37 is performed. At this time, the operator operates the function selection switch 21 and the setting switch 22 of the operation switch unit 29 of FIG. 1 to set the installation conditions. During normal operation, the engine is operated by the engine state determination routine RT2. If it is a normal rotation, it will move to the main program.

In this way, the microprocessor unit 7 determines the detected value of each sensor of the sensor unit 28 in the order of the main program of FIG. 4 under the condition of the set sensor. Here, the waveform shaping circuit 6 provides the shaped waveform to the microprocessor unit 7 in order to prevent malfunctions when sensing the rotational speed of the engine.

When the microprocessor unit 7 operates in the program order of FIG. 4, first, the function selection and setting judgment routine RT4 selects the current time (including all information on the timer) and whether or not to display the function, and then determines the engine speed. The routine proceeds to the routine RT5 and calculates a value for determining whether the engine speed during rotation is normal or abnormal.

After the engine speed determination routine RT6 determines whether the engine is in an overspeed state, the microprocessor unit 7 uses the power amplifier 10 at the dangerous rotation speed of the engine or the overspeed state of the engine. A warning signal is output to the buzzer 24.

As described above, when the abnormal state of the engine continues, when the overheated state of the engine is detected by the temperature sensor 19 of FIG. 1, and when the pressure of the lubricant drops by the pressure sensor 20, the engine abnormal state is processed. The warning sound is output through the power amplifier 10 and the buzzer 24 for a predetermined time set in the routine RT7 and the abnormal state of the current engine is displayed through the display driving circuit 8 and the display device 9. .

If the abnormal state of the engine continues over the set time, the microprocessor unit 7 energizes the solenoid 23 through the power amplifier 10 to stop the diesel engine to stop the engine. Or, in the event of an emergency, safe measures can be taken in the absence of an operator.

The relationship of the above operation will be described in detail by the respective procharts as follows.

When the initialization routine of FIG. 2 is performed after the power is turned on, when the initialization step 34 is performed at the start step 33, input and output terminal (I / O) designation, power supply abnormality, normal state of the timer, etc. After confirming that the nonvolatile memory 11 is read, the process proceeds to the next step.

The rotation sensor reference pulse table system 35 displays the output pulses of the rotation sensor per engine revolution, and displays the state previously set by the setting information. Next, in the installation condition determination step 36 in the installation condition determination and setting routine RT1, the driving conditions are selectively driven according to the setup state of the sensor and the operation switch.In the state corresponding to the installation condition, the installation information setting and the nonvolatile memory are performed. Then, the recording step 37 is executed, and the operation time display step 38 is performed when the installation condition is not applicable. Installation Information Setting Step and Recording to Nonvolatile Memory In step 37, the output pulse number Pr of the engine rotation sensor is set, the engine's overspeed rotation speed and the engine's dangerous rotation speed are recorded in the nonvolatile memory. Done. In operation time display step 38, the total running time of the engine and the cumulative time of overspeed operation are displayed. After performing the function of the operation time display step 38, the engine rotation step 39 in the next engine state determination routine RT2 determines whether the engine is to be rotated, and in the state in which the engine rotates, the main program of FIG. In the state where the engine does not rotate, the function switch determination step 40 is performed.

At this time, the function selection switch 21 of FIG. 1 passes the next time display flag set step 41 to the main program of FIG. 4, and the microprocessor unit 6 controls the current time display and various function displays. Done.

Then, the interrupt program routine that performs the operation of a separate program every predetermined period passes to the reference pulse and the reference time accumulation step 43 after the execution of the start step 42 as shown in FIG. 3 and accumulates the frequency Pref of the reference pulse. After the reference time is accumulated, the display cycle judgment step 44 in the display cycle determination and the operation time accumulation routine RT3 is performed.

In a state where a predetermined time has not elapsed in the display cycle determination step 44, the operation flag step 45 determines whether the operation flag is set, and when the operation flag is set, the operation time accumulation step 46 In the state where the operation time is continuously accumulated and the operation flag is not set, it is determined in the speeding flag step 47 whether the speeding flag is set.

In this case, if the speeding flag is not set, the process proceeds to the end step 49 and performs the start step 42 again. If the speeding flag is set, the speeding flag is accumulated and the above operation is performed. do.

While the above operation is performed, if a predetermined time has elapsed in the display cycle determination step 44, the process proceeds to the display step 50 to determine the display position of the display device 9 of FIG. The display operation is repeated.

This interrupt program is operated like the main operation program of FIG. 4, and after the start step 51 of FIG. 4 is executed, the flag is first displayed in the time display flag step 52 in the function selection and setting determination routine RT4. If it is set or not, and if it is set to "1", the display proceeds to the present time display step 53 and displays the current time. Then, the function switch step 54 determines whether the function switch is operated. As the function selection switch 21 is driven, the function of the elapsed time display, the operation time display, and the time display flag reset is performed in the function display step 55.

In the next setting switch step 56, it is determined whether the setting switch 22 of FIG. 1 has been operated, and when the function switch 22 is pressed, the operation display thereof is performed in the setting display step 57. After performing operations such as setting the time and resetting the elapsed timer, the rotation pulse and the reference pulse reading step 59 are performed. If the flag is set to " 0 " in the time display flag step 52, the function switch step 58 is immediately performed, and the process proceeds to the current time display step 53 and repeats the above functions. Done.

The number of rotation pulses (Pin) obtained in correspondence with the rotation of the engine and the internal reference pulse number (Pref) of the microprocessor unit 7 in the rotation pulse and the reference pulse readout step 59 in the engine speed determination routine RT5 are determined. After the reading, if one of the measured values exceeds the calculation start value Nref in the pulse number determination step 60, the rotation speed calculation step 61 is executed, and if it is less than the engine abnormal state processing routine RT7. The engine overheating and lubrication abnormality determination step 70 is performed.

In the rotation speed calculation step 61, calculation is performed as follows based on the rotation pulse and the reference pulse readout.

The number of revolutions at this time

To calculate the engine speed.

Where Pr is the number of rotation sensor output pulses per engine revolution and Fref is the frequency of the internal reference pulse (Pref).

If it is determined that the rotational speed calculated by the rotational speed calculation step 61 is equal to or higher than the speeding rotational speed set in the speeding speed determination step 62, and the speeding processing step 63 sets the speeding speed set and the display blinking pattern, After the lag set and the time display flag are reset, the rotation speed is displayed in the blinking state, and the dangerous rotation speed determination step 64 determines whether the rotation speed is higher than the dangerous rotation speed, and generates a warning sound in the warning output step 65 in the case of the dangerous rotation speed. Let's do it. At this time, the user is informed as a set error display that the current state is an abnormal state.

If the current engine rotation speed is not the dangerous rotation speed, the speed determination step 66 determines whether the overspeed duration time is greater than or equal to the set time, and if the engine speed is greater than or equal to the set time, the alarm output step 67 generates a warning sound. Here, the warning sound of the warning output step 67 and the warning output step 65 can be distinguished into an intermittent warning sound and a continuous warning sound. After the engine overspeed determination routine RT6 is executed, the engine overheating and lubrication abnormality determination step 70 in the engine abnormality state processing routine RT7 is performed.

When the engine speed is normal in the speed rotation speed determination step 62, the operation flag step 68 is immediately performed to recognize that the engine is in a normal state, and the engine overheating and lubrication abnormality determination step 70 is performed. Will proceed.

At this time, the overheated state of the engine is detected as the temperature sensor 19 of FIG. 1, and the abnormal state of the lubricating oil is sensed as the pressure sensor 20 of FIG. 1.

At this time, in the engine overheating and lubrication abnormality state, the warning sound and error display are displayed on the display device 9 of FIG. Of course, the warning sound and error display at this time are output separately from other abnormal conditions.

When the abnormal state has elapsed for a predetermined time or more, the engine stop output is output from the microprocessor unit 7 to the power amplifier 10 in the case where the predetermined time elapses and continues to proceed even after the set time has elapsed. This operation is performed in the engine stop output step 73.

In the power amplifier 10, the solenoid 23 is excited to stop the operation of the engine. In the engine stop step 74, the engine stop state is judged by the output of the rotation sensor 18 of FIG. 1, and the solenoid is excited until the engine stops, so that the engine can be reliably stopped in the abnormal state of the engine. do.

When the engine overheating and lubrication fault determination step 70 recognizes that the engine is in a normal state, it is immediately determined whether or not the display of the current time is set in the time display fragment step 75. The calculation of the present time and the elapsed time is performed in the calculation step 77 of the present time and the elapsed time, and when the time display flag is not set, the rotation speed of the engine is determined by the rotation speed display step 76. It is output to the display apparatus 9 of FIG.

After performing the above operation, it is determined that the overspeed time recording time of operation of the overspeed time recording step 78 is stored in the nonvolatile memory when the recording time is reached. By calculating and storing according to the cumulative time zone, it is possible to overcome the limitation of the write repetition count when using the E ² PROM memory.

By repeating this flow, the engine's operating state is periodically stored in the nonvolatile memory unit, and the engine's abnormal state is notified to the operator in advance (which generates a warning sound) so that it can cope with the abnormal state and stop the engine. will be.

As described above, the present invention compares the output value of the sensor that can detect the operating state of the engine with the data value set in the operation switch unit to prevent overspeed operation, the dangerous rotational speed of the engine for more than a set time, or the engine The engine can be automatically stopped in the event of overheating or abnormal lubricating oil. One display device of the present invention can obtain the following information.

(1) Display of engine speed (RPM).

(2) Display of total operation time of engine and accumulated time of overspeed operation as indication of operation time

(3) Current time display.

(4) Elapsed time display after the time set by the timer function.

(5) Indication of engine overheating, lubricating oil abnormality, dangerous rotation speed of engine, etc.

(6) Setting the output pulse number of the rotation sensor per revolution of the engine, setting the overspeed rotation speed, setting the dangerous rotation speed, etc.

Claims (5)

A sensor unit 28 including a rotation sensor, a temperature sensor, and a pressure sensor, and an operation switch unit 29 for setting the conditions of each sensor in the sensor unit 28 and each detected by the sensor unit 28. In a circuit composed of a microprocessor unit (7) for comparing the sensing value of and the value set by the operation switch unit (29), outputting data on the operating state and time of the engine detected by the microprocessor unit (7). Display means consisting of a display device connected via the indicator drive circuit 8 for the purpose, and the solenoid 23 to which a duplicated signal is applied through the power amplifier 10 in the abnormal state of the engine in the microprocessor unit 7. And an engine stop means configured to include a buzzer 24, a nonvolatile memory 11 which allows the microprocessor unit 7 to store an operating time of the engine at a predetermined time, and the display A driving and monitoring apparatus for a diesel engine provided with a power supply circuit (30) for supplying independent power to the copper circuit (8) and the microprocessor unit (7), respectively. The power supply circuit 30 according to claim 1, wherein the power supply circuit 30 for supplying the independent power supply includes: a first power supply of the DC power supply 26 to the first constant voltage circuit 12 through the diodes 14 and 15; And a passage, a second passage through which a direct current power source (26) is supplied to the second constant voltage circuit (13) through a diode (16), and a driving detection device for a diesel engine. Determines whether the function switch is selected or not, and displays the rotation speed, current time, elapsed time, operation time, etc. and selects the function to perform the current time and elapsed timer reset functions according to the setting of the setting switch. After reading the setting judgment routine RT4, the rotation pulse of the rotation sensor and the reference pulse inside the microprocessor unit 7, the engine speed determination routine RT5 calculates the engine speed and obtains the engine speed value. And an engine speed determination routine (RT6) for outputting a warning signal by making a dangerous rotation speed and a speed determination based on the engine speed value obtained in the engine speed determination routine (RT5), and in the engine speed determination routine (RT6). Of diesel engine which consists of engine abnormal condition processing routine (RT7) which detects whether overspeed is judged and whether temperature sensor and pressure sensor are abnormal and stops engine when engine abnormal condition occurs. A control method. 4. The engine speed determination routine RT6 includes: a dangerous rotation speed determination step 64 and a duration determination step 66, which are performed after the speeding display step 63 is performed, and the dangerous rotation speed determination step; In the case of the dangerous rotation speed at 64, the warning output step 65 which causes the display device 9 to generate an error signal and the alarm signal to the buzzer 24, and at the speed determination step 64 at the speed determination step 64; And a warning output step (67) for outputting a warning signal to the buzzer (65). 4. The engine state processing routine (RT7) is characterized in that the engine overheating and lubrication fault determination step (70) detected by the sensor and the engine overheating and lubrication fault determination step (70) during normal operation of the engine. The time display flag judgment step 75 to be performed, the current time and elapsed time calculation step 77, the operation to store in the nonvolatile memory 11 over a predetermined time period, the overspeed time recording step 78, and the engine overheat And a warning output step 71 for outputting a warning signal and an error display signal when an abnormal condition of the engine occurs in the lubrication abnormality determination step 70, and an engine stop output step for outputting an engine stop signal after a predetermined time after the warning output. 73) and an engine stop step (74) for checking whether the engine stops when the engine stops.