JPH02215949A - Stopping device and method for diesel engine - Google Patents

Abstract

PURPOSE:To abate the fatigue of an operator so sharply by installing a judging means for judging whether an engine is stopped or not, and an interrupting means for interrupting a power supply to a controller, respectively. CONSTITUTION:A fuel injection pump 2 and a governor 3 are parallelly installed in an engine 1. Starting and stopping of the engine 1 are performed according to on-off operation of a switch 9. A relay 12 is set up between electrical equipment around the engine of a controller 10 or the like and a power source 11. The controller 10 is operated by the power source 11, and it drives and controls a motor 5 on the basis of output of a sensor 6 or the like, while it performs energizing or deenergizing control over the relay 12. With only simple operation, off-operation of the switch, engine stopping operation and power-off operation both are automatically and surely performed. Thus, operator's fatigue can be sharply abated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a diesel engine stopping device and a diesel engine stopping method.

[Conventional technology]

In a diesel engine, the target engine speed is set using a throttle dial, an accelerator pedal, or the like. Then, the controller operated by the device power source takes in the target rotation speed as a sensor signal, and controls the cabana machine by driving the cabana machine using an electric actuator so that the engine rotation speed reaches the target rotation speed. ing.

[Problem to be solved by the invention]

By the way, a power switch (usually the same as the engine starter switch) is placed in the driver's seat to cut off the tR supply to the controller, etc. of the device power supply, and the operator can stop the engine while it is running. If the switch is operated as expected, the power supply to the actuator etc. will be cut off, and the engine may not be able to be stopped reliably.

Therefore, if you want to stop the engine reliably, manually operate the fuel control lever of the fuel injection pump to the engine stop position (no fuel injection position), and then hold the lever in the stop position until the engine stops. , and then you need to operate the above switch to turn off the power.

However, the series of operations described above is troublesome for the operator, and the operation of the lever requires a considerable amount of operating force, resulting in burden and fatigue on the operator.

Further, a solenoid valve or the like is disposed in the fuel supply passage of the engine, and the solenoid valve or the like is operated in response to the operation of the power switch to cut off the fuel supply to the engine and stop the engine. be.

However, providing an actuator such as the electromagnetic valve only for stopping the engine is expensive in terms of cost and is not suitable for practical use.

The present invention has been made in view of these circumstances, and includes a diesel engine stop device that can stop a diesel engine with a simpler configuration than conventional ones, and a diesel engine stop device that can stop a diesel engine in a simple manner. Its purpose is to provide a method for stopping the engine.

[Means and effects for solving the problem] Therefore, in the present invention, in a diesel engine including a controller that controls the fuel injection amount of the engine so that the number of revolutions of the diesel engine becomes a target number of revolutions, The controller includes a determining means for determining whether the diesel engine has stopped, and a cutoff means for cutting off power supply to the controller, and the controller is configured to stop the engine when a starter switch of the diesel engine is turned off. when the means for controlling the fuel injection amount and the determining means determine that the engine has stopped (
; and means for outputting a signal for activating the cutoff means to the cutoff means.

That is, according to this configuration, during normal operation, the controller specifically drives and controls the actuator so that the engine rotation speed becomes the target rotation speed set by the rotation speed setting means. At this time, the amount of fuel supplied to the engine from the fuel injection means is adjusted to an injection amount at which the engine rotational speed becomes the target rotational speed.

Then, when the engine starter switch is turned off,
Rather than turning off the power in response to this off operation, the controller drives and controls the actuator so that the engine stops in response to the off operation. Specifically, no fuel is injected from the fuel injection means.

A determination means, specifically a timer or an engine rotation speed detection sensor, is used to determine whether the engine has stopped when the timer detects a set time or when the sensor detects zero engine rotation speed.

The controller outputs a signal to the cutoff means for cutting off power supply to the controller when the judgment means judges that the engine has stopped.

Then, the cutoff means cuts off the power supply to the controller based on the output signal. In this way, when the starter switch is turned off, the engine speed is controlled to stop the engine, and then a series of operations are automatically performed to confirm that the engine has stopped and turn off the power. . .

Further, the actuator is not an actuator that operates only when the engine is stopped, but is used as an actuator that changes the fuel injection amount both during normal operation (starter switch on) and when the engine is stopped (starter switch off).

Further, in the present invention, in a diesel engine including a controller that controls the fuel injection amount of the engine so that the rotation speed of the diesel engine becomes a target rotation speed,
a step of determining whether a starter switch of a diesel engine is on or off; a step of controlling the fuel injection amount so that the engine stops when it is determined that the starter switch is turned off; and a step of controlling the fuel injection amount so that the engine stops. A process of determining whether the engine has stopped, and a process of cutting off power supply to the controller when it is determined that the engine has stopped are performed.

〔Example〕

Hereinafter, with reference to the drawings, a diesel engine stopping device according to the present invention will be explained. An example of a method for stopping a diesel engine will be described.

FIG. 1 is a block diagram conceptually showing an example of a device for stopping a diesel engine according to an embodiment of the present invention or an example of a device used to implement a method for stopping a diesel engine according to the present invention.

As shown in the figure, engine (diesel engine) 1
A fuel injection pump 2 and a governor 3 are installed in parallel.

The fuel control lever 4 of the governor 3 is driven by a lever drive motor 5 and is swung in the direction of arrow A. The drive position of the lever 4 is determined by a position sensor attached to the motor 5 (
For example, a rotary potentiometer is used).

An engine rotation speed sensor 7 that detects the actual rotation speed Ne of the engine 1 is attached to the output shaft 1a of the engine 1, and outputs a signal indicating the rotation speed Ne.

The throttle l setting device 8 includes a dial 8a that rotates in the direction of arrow B and a throttle sensor 8b (for example, a rotary potentiometer is used) that detects the amount of rotation of the dial 8a.

This throttle sensor 8b outputs a signal corresponding to the rotation amount (operation amount) of the dial 8a, that is, a signal instructing the target rotation speed Nr of the engine 1.

The starter switch 9 is turned on.

This is a switch that starts or stops the engine 1 depending on the off position, and when the switch 9 is operated to the on side (starter side) and the switch 9 is operated to the off position (engine stop side). Outputs on and off signals to indicate this, respectively.

Each signal output from the position sensor 6, rotation speed sensor 7, throttle sensor 8b, and starter switch 9 is input to the controller 10.

On the other hand, the power supply 11 is a device power supply for electrical equipment surrounding the engine such as the controller 10 (the area surrounded by the two-dot chain line) and other electrical equipment (lighting equipment, etc.) of the vehicle in which the controller 10 and the like are installed. Furthermore, a cutoff means for cutting off the power supply to the device, ie, a contact type or non-contact type relay 12, is further disposed between the device and the power source 11.

The controller 10 is operated by the power source 11, and controls the drive of the motor 5 based on the output of the sensor 6, etc., as well as energizes and deenergizes the relay 12.

Note that this relay 12 enters an energized state when the starter switch 9 is turned on, and thereafter remains in an energized state unless a signal is output from the controller 10 to cut off the power supply. It is assumed that this has been done.

The processing procedure performed by the CPU in the controller 10 will be described below with reference to FIG.

As shown in the figure, in this procedure, the starter switch 9
First, it is determined whether or not the starter switch 9 is turned on based on the output signal of the starter switch 9 (step 101).In other words, immediately after the starter switch 9 is turned on, a starter motor (not shown) is driven. Then, cranking rotation of the engine 1 is started. On the other hand, the controller 10 applies a motor drive signal to the motor 5 for supplying suitable fuel to the engine 1 at the time of starting. In this way, the engine 1 is started and if the engine is in operation, the determination result in step 101 becomes YES, and the detection signal (target rotation speed Nr) of the throttle sensor 8b is then input (step 102).

In a memory (not shown) in the controller 10, the target drive position of the lever 4 corresponding to the throttle sensor detection signal is stored with the characteristics shown by the arrow (see the graph in step 103 in the figure). .

More specifically, by setting the lever 4 to the target drive position, the fuel injection pump 2 moves to I! L″fl amount of fuel is injected and supplied to the engine 1, and the rotational speed Ne of the engine 1 becomes equal to the target rotational speed N″.

Step 103) in which a process of reading out the lever target position corresponding to the current throttle sensor detection signal from the memory is executed.

Note that the lever target position corresponding to the throttle sensor detection signal may be determined by continuous calculation instead of being read from the memory.

Next, a motor drive signal is output to the motor 5 so that the lever 4 is set at the lever target position read in step 103 above. Specifically, feedback control is performed in which the output of the position sensor 6 is fed back to output a motor drive signal that makes the deviation between the output and the lever target position zero. In this way, during engine operation, the engine speed is controlled so that the desired engine speed set by the throttle amount setting device 8 is obtained (step 104).

On the other hand, if the determination result in step 101 is NO, that is, if the starter switch 9 is turned off, a timer (not shown) in the controller 10 is started (step 105).

Next, the controller 10 outputs a motor drive signal to the motor 5 so that the lever 4 is set to the lever target position (see arrow C shown in step 103 in the figure) where the engine 1 stops. In this case, when the lever 4 is set to the target position, the fuel injected by the fuel injection pump 2 is not injected, and the engine 1 is stopped. Therefore, as in step 104, by performing feedback control to output a motor drive signal such that the deviation between the output of the position sensor 6 and the lever target position becomes zero, the lever 4 will eventually reach the lever target position, and the engine will start. 1 will be stopped (step 106).

Next, it is determined whether or not the set time of the timer has elapsed. Note that this set time is determined in advance through experiments, simulations, etc. as a sufficient time for the lever 4 to reach the lever target position 1 and the engine 1 to stop under the control in step 106, and is stored in a memory (not shown). (Step 107).

Thereafter, the processes of steps 106 and 107 are repeatedly executed, and when it is determined that the timer setting time has elapsed (determination result of step 107 is YES), the controller 10 performs a process to cut off the power supply to the device. A signal is output to relay 12. When the relay 12 receives the above signal, it is deenergized and operates to cut off the power supply to the device (step 108).

In this way, in this embodiment, when the starter switch 9 is turned off, the power is not turned off simultaneously with the same operation, but the engine speed is controlled to stop the engine while maintaining the power supply state. The power is turned off after determining that it has stopped. Therefore, the process of stopping the engine and turning off the power is automatically performed by simply turning off the starter switch 9 once.

In the above embodiment, time management is performed to determine whether or not the engine has stopped based on whether or not the timer setting time has elapsed. It is possible to make a determination based on the detected value.

FIG. 3 shows a processing procedure for determining whether or not the engine has stopped based on the detected value of the engine rotation speed sensor 7.

As shown in the same figure, in this procedure, it is determined in step 201 whether or not the starter switch 9 has been turned on, similarly to the processing procedure in FIG. In steps 202-204, the same processing as in steps 102-104 is performed.

On the other hand, if the determination result in step 201 is NO and the starter switch 9 is turned off, the controller 10 controls the engine 1 as in step 106.
Feedback control is performed to output a motor drive signal to the motor 5 such that the deviation between the lever target position at which the lever stops and the output of the position sensor 6 becomes zero (step 205).

Next, the detection signal (actual engine speed Ne) of the engine speed sensor 7 is input (step 206>
.

Then, it is determined whether the input engine speed Ne has become zero. Note that this determination of zero rotation speed is based on the rotation speed N
It may be determined that e actually becomes zero, by setting a threshold No. (rotation speed close to zero) and determining that the rotation speed Ne becomes zero when the rotation speed Ne is less than or equal to the threshold No. It may be determined that the engine speed Ne has become zero (step 207).The steps 205 to 207 are repeated, and when it is determined that the engine speed Ne has become zero (step 207),
(determination result in step 207 is YES), step 10
Similarly to step 8, the process of cutting off power supply to the device is executed (step 208).

In the processes of steps 201 to 208 above, engine stop is determined based on the output of the engine rotation speed sensor 7, but the engine stop is not limited to this, and the engine stop is determined based on the oil pressure of the hydraulic circuit driven by the engine 1. In this case, the process in step 206 is replaced with step 206': the input of the oil pressure sensor detection signal of the hydraulic circuit, and the judgment process in step 207 is replaced with step 207': the signal detected by the oil pressure sensor. Is the oil pressure zero? Instead of steps 201 to 205 and step 20
6', 207', and 208 in step 201 above.
-208 may be executed.

In addition, the engine stoppage may be determined based on whether or not the generated voltage of the alternator driven by the engine 1 has decreased.Furthermore, it may be determined by any method that can determine the engine stoppage, such as a decrease in engine oil pressure It is.

〔Effect of the invention〕

As explained above, according to the present invention, engine stop processing and power supply OFF processing can be automatically and reliably performed by a simple operation of turning off a switch. Therefore, the effect of significantly reducing operator fatigue can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram conceptually showing an example of a diesel engine stopping device according to the present invention or an example of a device used to implement the diesel engine stopping method according to the present invention, and FIG. FIG. 3 is a flowchart showing a processing procedure performed by the controller shown in FIG. 1, which is a flowchart showing an embodiment of the method according to the present invention; FIG. 3 is a flowchart illustrating another embodiment of the method according to the invention. DESCRIPTION OF SYMBOLS 1... Engine (diesel engine), 2... Fuel injection pump, 3... Governor, 4... Fuel control lever, 5... Lever drive motor, 7... Engine rotation speed sensor, 8・・・Throttle amount setting device, 8b・
...Throttle sensor, 9...Starter switch, 1
0... Controller, 11... Power supply, 12... Relay Figure 2 Figure 3

Claims (2)

[Claims] (1) In a diesel engine, the diesel engine includes a controller that controls a fuel injection amount of the engine so that the number of revolutions of the diesel engine becomes a target number of revolutions, the controller comprising: a determining means for determining whether the engine has stopped; and the controller. a cutoff means for cutting off power supply to the diesel engine, and a means for controlling the fuel injection amount so that the engine is stopped when a starter switch of the diesel engine is turned off; A stopping device for a diesel engine, comprising means for outputting a signal for activating the cutting means to the cutting means when it is determined that the engine has stopped. (2) In a diesel engine equipped with a controller that controls a fuel injection amount of the engine so that the number of revolutions of the diesel engine becomes a target number of revolutions, a step of determining whether a starter switch of the diesel engine is on or off; a step of controlling the fuel injection amount so that the engine stops when it is determined that the switch is turned off; a step of determining whether the engine has stopped; and a step of determining whether the engine has stopped. A method for stopping a diesel engine, the method comprising: cutting off power supply to the controller when the controller is activated.