JPH0310333Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a diagnostic device for a lubricating oil priming pump that is operated for a predetermined time at predetermined time intervals while an internal combustion engine is stopped to intermittently supply oil into cylinders, etc. .

<Prior Art> Generally, when an internal combustion engine such as a diesel engine is not used for a long period of time, the engine is operated periodically for short periods of time to prevent functional deterioration such as rusting on the inner surface of the cylinder. At this time, lubricating oil is supplied to the diesel engine using a priming pump or a lubricating oil supply system, instead of the conventional supply system for normal operation that includes a pump, lubricating oil cooler, temperature control valve, oil pressure sensor, and oil temperature sensor. This is done using an intermittent supply system equipped with a heater. On the other hand, the detection signals from the above-mentioned oil pressure sensor and oil temperature sensor during normal operation are input to a measuring device or recorder and displayed and recorded as measured values, and the driver can use these measured values to determine the lubricating oil supply system. It determines whether there are any abnormalities and monitors the operating status of the engine.

<Problems to be solved by the invention> However, since the above conventional lubricating oil supply system is divided into two systems, one for normal operation and one for intermittent operation,
Unless an oil pressure sensor is provided at the confluence of both systems, this oil pressure sensor cannot detect the oil pressure pumped by the priming pump, and there is a drawback that it is impossible to detect abnormalities that may occur in the priming pump.
In addition, even if the pressure of the priming pump can be detected, the measurement value and recorder may simply display and record the detection signal as a measurement value.
Alternatively, since this measurement value is merely a warning that an abnormality is issued when it deviates from the normal range, the operator must frequently check the measurement value in order to quickly and accurately discover abnormalities in the priming pump. There is a drawback. Furthermore, in intermittent operation, the pressure and temperature of the lubricating oil and their fluctuations are significantly different from those in normal operation, so there is a problem in that specialized knowledge and experience are required to determine abnormality of the priming pump. If the internal combustion engine continues to be unused for a long period of time without noticing an abnormality in the priming pump, a situation will arise in which the engine cannot be started due to rust on the sliding parts.

Therefore, the purpose of the present invention is to determine whether or not there is an abnormality in the lubricating oil priming pump, which is operated intermittently to supply lubrication while the internal combustion engine is stopped, based on the input signal from the oil pressure sensor, and to provide information regarding the nature of the abnormality. It is an object of the present invention to provide a diagnostic device for a lubricating oil priming pump that can provide output and contribute to ensuring the maintenance of an engine that is not used for a long period of time and to saving labor.

<Means for Solving the Problems> In order to achieve the above object, the lubricating oil priming pump diagnostic device of the present invention is designed to diagnose lubricating oil priming pumps that intermittently supply oil into cylinders, etc. while the internal combustion engine is stopped. Based on the input signal and time signal from the pressure sensor installed in the pipe, whether or not the time interval in which the lubricating oil pressure exceeds the set pressure is within a predetermined tolerance range for the predetermined time interval of intermittent operation. and an intermittent operation determination means for determining the time, and a time period during which the lubricating oil pressure continues to be equal to or higher than the set pressure based on the input signal and time signal from the pressure sensor, and the measured time is set to a predetermined reference value. a priming operation determination means for determining whether or not the intermittent operation determination means and the priming operation determination means are within a predetermined allowable range; It is characterized by being able to diagnose defects and poor operation.

<Operation> First, the intermittent operation determination means starts timing from the time when the lubricating oil pressure exceeds the set pressure in the previous priming operation, based on the input signal from the pressure sensor and the time signal, and once this pressure has reached the set pressure. After the pressure has decreased to below the pressure, the timing ends when the pressure exceeds the set pressure again in the current priming operation, and the time interval obtained by timing is compared with the predetermined time interval for intermittent operation.
It is determined whether the difference between the two is within a predetermined tolerance range. If the determination result is positive, it is determined that the lubricant priming pump has started normally, and if the determination result is negative, it is determined that the lubricant priming pump has failed to start. Next, the priming operation determination means starts timing from the time when the lubricating oil pressure exceeds the set pressure in the current priming operation, based on the input signal and time signal from the pressure sensor, and when this pressure becomes the set pressure. When the time value is below, the time measurement is finished, the time value is compared with a predetermined reference value, and it is determined whether the difference between the two is within a predetermined tolerance range. When the determination result is positive, it is determined that the lubricating oil priming pump is operating normally, while when the determination result is negative, it is determined that the lubricating oil priming pump has failed to stop or the lubrication oil It is determined that the oil priming pump is malfunctioning.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

Figure 1 is a schematic diagram of a diesel engine equipped with the lubricating oil priming pump diagnostic device of the present invention.
1 is a diesel engine; 2 is an oil pan provided in the diesel engine 1 to store lubricating oil after refueling; 3 is a return pipe 4 connected to the oil pan 2, and is driven by a motor 5 when the engine is stopped. 6 is a pressure sensor provided on the engine side of the oil supply pipe 7 leading from the priming pump 3 to the diesel engine 1, and 8 is a pressure sensor installed in the oil supply pipe 7 to supply the lubricating oil under pressure. A heater for heating, 9 is the return pipe 4
10 is an intermittent operation determining means and a priming operation determining means, which will be described later. A computer as a diagnostic device is equipped with means and a clock and performs a predetermined determination based on a detection signal input from the pressure sensor 6 only when the heater 8 is not energized; 11 is a determination result output from the computer 10; 12 is a lubricant that forms part of the lubricating oil system for normal operation which joins the lubricating oil supply system for intermittent operation consisting of the above-mentioned members 2 to 11 via the temperature control valve 13. It is an oil cooler.

When the heater 8 is not energized, the motor 5 of the priming pump 3 is operated at predetermined time intervals _t1 for a predetermined time _t2 according to a preset sequence, as shown in FIG. 2b. Further, when the heater 8 starts to be energized by turning on the temperature switch 9, it outputs a signal to the motor 5 and causes the motor 5 to operate continuously, regardless of the above sequence, until the temperature switch 9 turns off. It's becoming like that.

FIG. 2a is a diagram showing the pressure fluctuation of the lubricating oil in the oil supply pipe 7 when the priming pump 3 is operating normally according to the sequence when the heater 8 is not energized. When the priming pump is turned on, the lubricating oil pressure P starts to increase with a certain delay, after exceeding the set pressure Pm, it maintains the maximum value for a certain time, and then when the priming pump is turned off, it starts to decrease and reaches the set The pressure drops below Pm and returns to the original atmospheric pressure with a certain delay. In this case, the time τ for which the lubricating oil pressure P remains at or above the set pressure Pm
falls within the tolerance range of ±β with respect to a certain reference value t ₃ which is smaller than the on-time t ₂ of the pump. In addition, after the lubricating oil pressure P exceeds the set pressure Pm, Pm
The time interval t until exceeding the pump start time interval t ₁ falls within the tolerance range of ±α with respect to the pump activation time interval t 1 .

Each discrimination means of the computer 10 functions as shown in FIG. 3 when the heater 5 is not energized. That is, the intermittent operation determination means determines whether the lubricating oil pressure P is the set pressure Pm based on the input signal from the pressure sensor 6.
The time interval t from when it exceeds Pm until it exceeds Pm again
is measured by the built-in timer (after starting, step S1
), the measured value t is the above startup time interval.
It is determined whether or not it is within the tolerance range of ±α with respect to t ₁ (see step S6), and when the timed value t is greater than or equal to t ₁ +α, a signal indicating pump startup failure is output to the display device 11 ( (See step S11). In addition,
When the above-mentioned time value is less than or equal to t ₁ -α, this means that the pump is continuously operated by the signal from the heater 8 without following the above-described sequence, so no signal is output.
In addition, the priming operation determination means measures the time τ during which the lubricating oil pressure P continues to be equal to or higher than the set pressure Pm based on the input signal from the pressure sensor 6, using a built-in timer (see steps S3 and S4), and calculates the time value. τ
It is determined whether or not the value is within the tolerance range of ±β with respect to the constant reference value _t3 (see steps S5 and S7). When the determination result is positive, a signal indicating that the pump is normal is output (see step S9),
When the determination result is negative, if the timed value τ is t ₃ + β or more, a signal indicating a pump stop failure is sent, and if the timed value τ is t ₃ −
If it is less than β, a signal indicating pump operation failure is output (steps S8 and S10).
reference).

Regarding the operation of the computer 10 having the above configuration,
The following description will be made with reference to the flowchart shown in FIG.

When the priming pump 3 is activated in accordance with the sequence shown in FIG. The detection signal from is input as data to the computer 10, and the processing shown in FIG. 3 is started. Then, based on this input data, the intermittent operation determination means of the computer 10 resets a timer (t=0) when the lubricating oil pressure P exceeded the set pressure Pm last time, and sets a time interval t until it exceeds Pm again this time. time.

(S1) When the lubricating oil pressure P becomes equal to or higher than the set pressure Pm, the computer 10 proceeds to step S2, and if P is less than Pm, the computer 10 proceeds to step S6, and determines whether or not the timed value t is greater than or equal to t ₁ +α. do. If the result of the determination is positive, the time interval is too long, so the process advances to step S11 and displays "priming pump startup failure" on the display device 11, while if the result of determination is negative, the process returns to step S1.

(S2) The timer of the intermittent operation discrimination means is reset to t=0, and the timer of the priming operation discrimination means is reset to τ=0.

(S3) The priming operation determining means determines whether the lubricating oil pressure P indicated by the input signal from the pressure sensor 6 is equal to or higher than the set pressure Pm, and determines whether P≧
If Pm, step S4, S is executed by the above timer.
The duration τ is measured in a loop around 5, and if P>Pm, the process advances to step S7.

(S5) The priming operation determination means determines whether or not the timed value τ is equal to or greater than t ₃ +β. If the determination result is positive, the operation time is too long, and the process proceeds to step S8, where the display device 11 displays "Priming". If the determination result is negative, the process returns to step S3.

(S7) Since the lubricating oil pressure P is less than the set pressure Pm, the priming operation determination means determines whether or not the timed value τ up to that point is greater than or equal to t ₃ −β,
If the determination result is positive, the process advances to step S9 to display "normal" on the display device 11. If the determination result is negative, the operating time is too short, so the process advances to step S10 and the display device 11 displays "priming pump operation". "Defective" is displayed.

In the above embodiment, when the heater 8 is energized, the motor 5 is activated by a signal from the heater 8 and the priming pump 3 is continuously operated, so that the lubricating oil is quickly heated to a temperature higher than the lower limit oil temperature. can do.

<Effects of the invention> As is clear from the above explanation, the lubricating oil priming pump diagnostic device of the present invention is installed in the oil supply pipe of the lubricating oil priming pump that intermittently supplies oil into the cylinder etc. while the internal combustion engine is stopped. Based on the input signal from the pressure sensor and the time signal, the time interval at which the lubricating oil pressure exceeds the set pressure and the time at which the lubricating oil pressure continues to exceed the set pressure are measured, and these timed values correspond to the intermittent operation interval. Determine whether or not the standard values corresponding to the predetermined time interval and priming operation time are within predetermined tolerance ranges, and diagnose malfunctions in starting, stopping, and operation of the lubricating oil priming pump based on the determination results. This allows ordinary operators, not specialized engineers, to quickly and accurately learn about abnormalities that occur in the above-mentioned priming pump, which is essential to the lubricating oil supply system for intermittent operation, and to detect and detect abnormalities. It can deal with problems appropriately and greatly contributes to ensuring engine maintenance and saving labor.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a diesel engine equipped with the lubricating oil priming pump diagnostic device of the present invention;
The figure is a diagram showing the operating sequence of the lubricating oil priming pump and the variation in lubricating oil pressure accompanying it, and FIG. 3 is a flowchart showing the process flow of the diagnostic device. 1... Diesel engine, 2... Oil pan, 3... Priming pump, 4... Return pipe,
5...Motor, 6...Pressure sensor, 10...Computer, 11...Display device.

Claims (1)

[Scope of Claim for Utility Model Registration] A diagnostic device for a lubricant priming pump that is operated for a predetermined time at predetermined time intervals while an internal combustion engine is stopped to intermittently supply oil into cylinders, etc. Based on an input signal and a time signal from a pressure sensor provided in a fuel supply pipe leading to the internal combustion engine, a time interval in which the pressure of lubricating oil exceeds a set pressure is within a predetermined tolerance range with respect to the predetermined time interval. and an intermittent operation determining means for determining whether or not the lubricating oil pressure continues to be at or above the set pressure based on the input signal and time signal from the pressure sensor, and the measured time is determined in advance. priming operation determining means for determining whether or not the reference value is within a predetermined allowable range; A diagnostic device for a lubricating oil priming pump, characterized in that it is capable of diagnosing start-up, stop failure, and operation failure.