JPS6130131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine control device, and more particularly to an engine control device that automates engine maintenance work.

[Background of the invention]

Up until now, engines have been either manually operated and monitored by regular maintenance operations, or maintenance operations are performed using a maintenance operation circuit consisting of a timer combination and then manually monitored. It has been maintained. Maintenance operation and monitoring of this engine requires a high degree of skill, and it is necessary to detect abnormalities during operation early and guarantee the safety of system equipment, but with this conventional method, the technical level of the maintenance operator is Judgment treatment was influenced.

[Purpose of the invention]

An object of the present invention is to overcome the problems of the prior art described above, and to provide an automated, maintenance-free, and highly reliable engine in which maintenance content is not affected by differences in human technical level after the engine is installed. to provide control equipment.

[Summary of the invention]

In order to achieve the above object, the present invention focuses on the fact that various characteristic values of an engine are within a certain range under normal conditions, and performs maintenance operations on the engine depending on whether or not the engine is being used. Alternatively, the electronic control device is configured to stop the engine, give an alarm, display the status, etc. by performing actual operation and checking various characteristic values at that time.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of an embodiment of the present invention will be described below with reference to the drawings, taking an engine generator as an example.

FIG. 1 and FIG. 2 are a block diagram and an electrical system diagram of an engine generator, respectively. In these figures, a generator 2 connected to an engine 1 is started by a starting motor 3 and operated with fuel from a fuel tank 8, and the voltage of the generator 2 is kept constant by a voltage regulator 4. Electric power for starter motor 3 is supplied from battery 5. The heat generated during operation of the engine 1 is cooled down by the radiator 7. Exhaust gas is exhausted from the exhaust pipe 9. Lubricating oil is held in an oil pan 6 and mechanically pumped to each part. A control panel 11 controls starting, running, and stopping the engine generator. The base 10 serves as a foundation for mounting these devices and assembling and configuring the engine generator, and is fixed at the installation location.

FIG. 3 is a diagram showing an example of the configuration of the control device 11 of the present invention, which is composed of, for example, a microcomputer. The input circuit 21 includes foreign object confirmation Sr around the engine (particularly if there are people in the engine room, it is dangerous to start the engine, so check with a phototube, etc.), atmospheric pressure Ap, current A of commercial voltage, voltage V,
Battery 5 current A , voltage V , battery fluid specific gravity BG, engine rotational speed TM (speed detector 12 output in Figure 2), exhaust air temperature ET, fuel temperature
Sensor output signals such as FT, exhaust gas temperature GT, lubricating oil temperature OT, cooling water temperature WT, ambient temperature AT, reference partial vibration Vi, and lubricating oil pressure OP are input. These sensor output signals (input items) are stored in memory circuit 2.
A group of instructions indicative of the maintenance procedure stored in 6 is input to the control circuit 25 as an instruction signal via the instruction register 27 and instruction decoder 28, and is taken into the control circuit 25, and at the same time, the control signal is input to the control circuit 25. is sent to the program counter 31, synchronized with the clock pulse from the clock generator 30, and input to the memory circuit (ROM) 26. From the memory circuit 26, a command signal ( Data indicating the normal range of input items, start and stop commands, etc.) are output. The command signal from the memory circuit 26 is outputted to the command register 27, and its contents are outputted via the output circuit 29 to the starting circuit 32, alarm display circuit 33, stop circuit 34, status display circuit 35, etc. Also, instruction register 2
The signal output from 7 to the command decoder 28 is sent to the control circuit 2.
The signal is fed back to step 5 and becomes a signal to proceed to the next step. Further, the command signal from the command register 27 is inputted to the comparison circuit 24 via the output register 23, where it is compared with the input item data taken into the control circuit 25 to determine whether it is normal or not. The results are outputted via the output circuit 29 to stop, alarm, display, etc. Furthermore, the signal from the program counter 31 is also converted by the command signal sent from the storage circuit 26 to the storage register 22 (RAM), and is output to the storage circuit 26 and the command register 27.

FIG. 4 shows an example of an operation flowchart of the control device configured as described above. In step 41, it is first checked whether the commercial power supply is live or not by checking the commercial power supply voltage V. If the person is alive, the engine generator only needs to be stopped, and this state is called electricity purchase. When power purchase is confirmed, if power is being purchased, the process moves to step 42, and the program counter 31 counts for a predetermined period of time, thereby confirming the continuation of the power purchase. When this confirmation is completed, the surrounding foreign object confirmation Sr is checked in step 43, and if there is a foreign object, it is stopped here.
If there are no foreign objects and safety is confirmed, a maintenance operation command is output in step 44 and the engine is started. This operation is performed by issuing a start signal from the memory circuit 26 when the count value of the program counter reaches a certain value and under the condition that no foreign object Sr is detected. When maintenance operation begins in this way, the engine speed gradually increases, so its speed in a steady state is checked in step 45 by comparing the output of the memory circuit 26 with the rotational speed TM. If not, an alarm is output in step 60. If the operation is normal, an operation display is performed in step 48, and the operation time is counted in step 46. When the time required for maintenance operation has elapsed, a stop signal is issued in step 47. By the above-described operation, it is possible to automatically check whether the speed of the engine generator during power purchase becomes normal.

Next, if the power purchase confirmation result in step 41 indicates a power outage of the commercial power supply, the power outage is confirmed for a certain period of time in step 49. This is also based on the count of the program counter 31. When it is confirmed that the power outage continues, a speed detection step 50 checks whether the engine generator is already in operation, and if it is, the step 4
Press 8 to display the operation. If the engine is not running, the process moves to step 51, where the lubricating oil level and water level are detected. If these are not at the specified levels, a stop command and alarm are issued at steps 47 and 60, and the engine is not started. If the oil and water levels are normal, the process proceeds to step 52 and a command to start the engine is issued, and the speed is detected in step 45. If the oil and water levels are normal, a warning is output in step 60, and if normal, the process proceeds to step 54. Proceed to. Here, a comparison 57 is made between the normal operating oil pressure increase record (oil pressure increase curve with respect to time) recorded in the memory circuit 26 and the actual oil pressure OP. If it is normal, proceed to step 56. In this step, as in step 54, the normal operating water temperature rise record 55 recorded in the memory circuit 26 and the actual water temperature are compared.
A comparison 57 with the WT is performed, and if it is abnormal, it is stopped and an alarm is issued in steps 47 and 60, and if it is normal, it proceeds to the next step. Although the steps after this are omitted in Fig. 4, check the exhaust gas temperature GT and reference partial vibration Vi (engine vibration) that have not been checked up to this point in the same way as the oil pressure, water temperature, etc. Make maintenance automatic.

In addition, in FIG. 4, in the hydraulic pressure check at step 54,
In the case of an abnormality in the oil pressure increase, feedback 58 is applied toward maintenance operation, the number of times on the maintenance operation counter is decreased, and the interval between maintenance operations is shortened. Further, if a power outage occurs when maintenance operation is about to occur, the jump circuit 59 is passed and the count is counted as if maintenance operation had been performed.

Figure 5 shows the waveforms of each input to the control device 11 with the time axis as the horizontal axis. T1 is when the engine is stopped, T2 is when the engine is running from the start command until reaching the rated speed, and T3 is when the engine is running at the rated speed. In the middle, T4 corresponds to the state from the stop command to the stop, and T5 corresponds to the state during the stop. The solid line of each waveform is a waveform indicating a normal state, and the dotted line is a waveform indicating an abnormal state. For example, for oil pressure OP, the solid line waveform is stored in the memory circuit 26, and this and the actual oil pressure OP
This shows that if the latter does not rise sufficiently as shown by the dotted line, it will be judged as abnormal.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, engine generator maintenance can be completely automated;
As a result, it is possible to completely eliminate differences in the technical level of maintenance personnel in the case of conventional manual maintenance, and highly reliable maintenance can be performed.

[Brief explanation of the drawing]

1 and 2 are a configuration diagram and an electrical system diagram of an engine generator, FIG. 3 is a diagram showing an embodiment of the present invention, and FIG. 4 is a flowchart showing an example of the operation of the embodiment of the present invention. FIG. 5 is a waveform diagram of various characteristic quantities of the engine generator. DESCRIPTION OF SYMBOLS 1... Engine, 2... Generator, 11... Control device, 21... Input circuit, 22... Memory register, 23... Output register, 24... Comparison circuit,
25...control circuit, 26...memory circuit, 27...
Instruction register, 28...Instruction decoder, 29...
Output circuit, 30... Clock generator, 31
...Program counter, 32...Start circuit, 3
3...Alarm display circuit, 34...Stop circuit, 35
...Status display circuit.

Claims (1)

[Claims] 1. In the case of maintenance operation and monitoring of engines, various characteristic values of the engine such as lubricating oil pressure, oil volume, cooling water temperature, water volume, exhaust gas temperature, rotation speed, etc. that need to be monitored during maintenance of the engine are a detection means for detecting; a storage means for storing a range of normal values indicated by the characteristic values when the engine is stopped and when the engine is running; a storage means for storing a group of instructions indicating a maintenance procedure for the engine; and various characteristics detected by the detection means. Compare each of the values with the range of normal values corresponding to the characteristic values read from the storage means, start and stop the engine according to the comparison results, issue an alarm, and control the comparison results. and a comparison control means for displaying a normality of the engine by maintenance operation when the engine is not in use, according to the maintenance procedure stored in the storage means, and a comparison control means for displaying the normality of the engine when the engine is not in use. An engine control device characterized in that engine maintenance can always be performed automatically by sequentially checking the above-mentioned characteristic values.