JP2841074B2 - Device and method for stopping diesel engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a diesel engine stop device and a diesel engine stop method.

[Conventional technology]

In a diesel engine, a target engine speed is set by a throttle dial, an accelerator pedal, or the like. Then, the controller operated by the device power supply takes in the target rotation speed as a sensor signal and drives the governor mechanism by an electric actuator so as to adjust the speed so that the engine rotation speed becomes the target rotation speed. I have.

[Problems to be solved by the invention]

In the driver's seat, a power switch (usually common to a starter switch of the engine) for shutting off power supply to a controller of the device power supply or the like is arranged, and an operator stops the engine during operation of the engine. If the switch is operated, the power supply to the actuator or the like is cut off, and the engine may not be stopped reliably.

So, if you want to stop the engine surely,
After manually operating the fuel control lever of the fuel injection pump to the engine stop position (no fuel injection position), hold the lever in the stop position until the engine stops, and then operate the switch to turn off the power. There is a need.

However, the above-described series of operations is complicated for the operator, and the operation of the lever requires a considerable amount of operating force, so that the operator is burdened and tired.

Also, an electromagnetic valve etc. are installed in the fuel supply passage of the engine,
In some cases, the solenoid valve or the like is operated in response to the operation of the power switch to shut off fuel supply to the engine and stop the engine.

However, providing an actuator such as the solenoid valve only for stopping the engine is costly and not suitable for practical use.

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

[Means and actions for solving the problem]

Therefore, according to the present invention, in a diesel engine including a controller that controls a fuel injection amount of the engine so that the rotation speed of the diesel engine becomes a target rotation speed, the diesel engine includes a shutoff unit that shuts off power supply to the controller. A controller that controls the fuel injection amount so that the engine stops when a starter switch of the diesel engine is turned off; a determination unit that determines whether the engine has stopped; Means for outputting a signal for activating the shut-off means to the shut-off means when the stop of the engine is judged by the judging means.

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

Then, when the starter switch of the engine is turned off, the controller does not turn off the power supply in accordance with the off operation, but controls the actuator to drive the actuator so as to stop the engine in accordance with the off operation. Specifically, the fuel of the fuel injection means is made non-injected.

Then, a determination means, specifically, a timer or an engine speed detection sensor or the like is used, and when the timer detects a timer set time or when the sensor detects zero engine speed, the engine stop is determined.

The controller outputs a signal for shutting off power supply to the controller to the shutoff means when the engine stop is judged by the judgment means.

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 so as to stop the engine, and thereafter, a series of operations for turning off the power are automatically performed after confirming that the engine has been stopped. .

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

Further, according to the present invention, in a diesel engine including a controller that controls a fuel injection amount of the diesel engine so that the rotational speed of the diesel engine becomes a target rotational speed, 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 starter switch is turned off; a step of determining whether the engine has stopped; and When the stop is determined, a step of shutting off the power supply to the controller is performed.

〔Example〕

Hereinafter, embodiments of a diesel engine stopping device and a diesel engine stopping method according to the present invention will be described with reference to the drawings.

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

As shown in the figure, the engine (diesel engine)
1, a fuel injection pump 2 and a governor 3 are provided side by side. The fuel control lever 4 of the governor 3 is driven by a lever drive motor 5 and swings in the direction of arrow A. The drive position of the lever 4 is determined by a position sensor (for example, a rotary potentiometer is used) 6 attached to the motor 5.
Is detected by

The output shaft 1a of the engine 1 is provided with an engine speed sensor 7 for detecting the actual speed Ne of the engine 1, and outputs a signal indicating the speed Ne.

The throttle amount setting device 8 includes a dial 8a that rotates in the direction of arrow B and a throttle sensor (for example, a rotary potentiometer is used) 8b that detects the amount of rotation of the dial 8a. From the throttle sensor 8b, a signal corresponding to the rotation amount (operation amount) of the dial 8a, that is, a signal indicating the target rotation speed Nr of the engine 1 is output.

The starter switch 9 is a switch for starting and stopping the engine 1 in accordance with the on / off state of the switch 9. The starter switch 9 is turned on (starter side) and the switch 9 is turned off (starter side). An on / off signal is output to indicate that the operation has been performed (engine stop side).

These position sensor 6, rotation speed sensor 7, throttle sensor
8b and each signal output from the starter switch 9 are:
Input to the controller 10.

On the other hand, the power supply 11 is a device power supply for electric equipment (enclosed by a two-dot chain line) surrounding the engine such as the controller 10 and other electric parts (lighting equipment and the like) on which the controller 10 and the like are mounted. Further, between the device and the power supply 11, there is provided a cut-off means for supplying power to the device, that is, for example, a contact type or non-contact type relay 12 is provided.

The controller 10 is operated by the power supply 11,
Based on the output of the sensor 6 and the like, the drive of the motor 5 is controlled, and the energization / deactivation control of the relay 12 is performed.

The relay 12 is energized with the ON operation of the starter switch 9 and is always energized unless a signal for shutting off the power supply is output from the controller 10 thereafter. Shall be done.

Hereinafter, a processing procedure performed by the CPU in the controller 10 will be described with reference to FIG.

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

A target drive position of the lever 4 corresponding to the throttle sensor detection signal is stored and stored in a memory (not shown) in the controller 10 with a characteristic shown by an arrow L (see the graph in step 103 in FIG. 3). .

Furthermore, by setting the lever 4 at the target drive position, the fuel injection pump 2 injects and supplies an optimal amount of fuel to the engine 1, and the rotation speed Ne of the engine 1 becomes the target rotation speed Nr.
Will be matched.

Then, the process of reading the lever target position corresponding to the current throttle sensor detection signal from the memory is executed (step 103).

It should be noted that the lever target position corresponding to the throttle sensor detection signal may not be read out from the memory but may be obtained by a sequential calculation.

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. Specifically, feedback control is performed in which the output of the position sensor 6 is fed back and a motor drive signal is output in which the deviation between the output and the lever target position becomes zero. In this way, during the operation of the engine, the engine speed is controlled such 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 sets the lever target position at which the engine 1 stops (see the arrow C shown in step 103 in the figure).
The motor drive signal is output to the motor 5 so that the lever 4 is set to the position shown in FIG. In this case, when the lever 4 is set at the target position, the fuel injected by the fuel injection pump 2 is in a non-injection state, and the engine 1 is stopped. Therefore, step
By performing feedback control for outputting a motor drive signal that makes the deviation between the output of the position sensor 6 and the lever target position zero as in the case of 104, the lever 4 eventually reaches the lever target position and the engine 1 stops. (Step 106).

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

Thereafter, the processing of steps 106 and 107 is repeatedly executed, and when it is determined that the timer set time has elapsed (determination result of step 107 is YES), the controller 10 issues a signal for cutting off power supply to the apparatus. Output to relay 12. When the above signal is input, the relay 12 is deenergized and operates so as to cut off the power supply to the device (step 108).

In this manner, in this embodiment, when the starter switch 9 is turned off, the power is not turned off at the same time as the starter switch 9, but the engine speed is controlled while the power supply state is maintained, and the engine is stopped. The power is turned off after judging the stop. Therefore, the process of stopping the engine and turning off the power is performed by turning off the starter switch 9 in the first operation.
It is performed automatically with only a few simple operations.

In the above embodiment, the engine stop is determined based on whether or not the timer set time has elapsed. However, it is determined whether or not the engine 1 has stopped. It is also possible to perform the determination based on the detected value.

FIG. 3 shows a processing procedure for determining whether to stop the engine based on the value detected by the engine speed sensor 7.

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

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

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

Then, it is determined whether or not the input engine speed Ne has become zero. It should be noted that the determination of the number of rotations zero is based on the rotation number Ne.
May be determined based on the fact that has actually become zero.
(Rotation speed close to zero) may be set, and when the rotation speed Ne is equal to or less than the threshold value No, it may be determined that the rotation speed Ne is considered to be zero (step 207). Thereafter, the procedures of steps 205 to 207 are repeatedly executed, and when it is determined that the engine speed Ne eventually becomes zero (the determination result YE of step 207)
S), the process of shutting off the power supply to the device is executed in the same manner as in step 108 (step 208).

In the processing of steps 201 to 208, the engine stop is determined based on the output of the engine speed sensor 7. However, the present invention is not limited to this, and the engine stop may be determined based on the hydraulic pressure of the hydraulic circuit driven by the engine 1. The determination may be made based on this. In this case, the above steps
Step 206 'is replaced by step 206': input of a hydraulic sensor detection signal of the hydraulic circuit, and the determination processing of step 207 is performed. Step 207 ': Is the hydraulic pressure detected by the hydraulic pressure sensor zero? Instead of steps 201-205 and steps 206 ', 20
7 ', 208 may be executed in the same manner as in steps 201 to 208 described above.

The determination of the engine stop may be made based on whether or not the power generation voltage of the alternator driven by the engine 1 has decreased. Further, any method can be used as long as it can determine whether the engine has stopped, such as a decrease in engine oil pressure.

〔The invention's effect〕

As described above, according to the present invention, the engine stop process and the power-off process are performed automatically and reliably by only a simple operation of turning off the switch. Therefore, the effect of significantly reducing operator fatigue can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram conceptually showing an embodiment of a diesel engine stop device according to the present invention or an example of a device used for implementing a diesel engine stop method according to the present invention. FIG. 3 is a flowchart showing a processing procedure performed by the controller shown in FIG. 1, and is a flowchart showing an embodiment of the method according to the present invention. FIG. 3 is a flowchart showing a processing procedure performed by the controller shown in FIG. 5 is a flowchart showing 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 speed sensor, 8 ... Throttle amount setting device , 8b ... throttle sensor, 9 ... starter switch, 10 ... controller,
11… Power supply, 12… Relay.

Claims (6)

(57) [Claims] 1. A diesel engine comprising a controller for controlling a fuel injection amount of the engine so that the rotation speed of the diesel engine becomes a target rotation speed, comprising: a cutoff means for cutting off power supply to the controller. A controller configured to control the fuel injection amount so that the engine stops when a starter switch of the diesel engine is turned off; a determination unit configured to determine whether the engine has stopped; and the determination. Means for outputting a signal for operating the shut-off means to the shut-off means when the stop of the engine is determined by the means. 2. The method according to claim 1, wherein the determining means determines that the engine has stopped when a predetermined time has elapsed since the starter switch was turned off.
A stopping device for a diesel engine as described. 3. A diesel engine stop according to claim 1, wherein said determination means determines that the engine has stopped when the number of revolutions of the engine has fallen below a predetermined set value. apparatus. 4. A diesel engine comprising a controller for controlling a fuel injection amount of the engine so that a rotation speed of the diesel engine becomes a target rotation speed, the controller comprising: (a) turning on / off a starter switch of the diesel engine;
(B) a control step of controlling the fuel injection amount so as to stop the engine when it is determined that the starter switch has been turned off; (c) the engine A stop determination step for determining whether or not the diesel engine has stopped; and (d) a shutdown step for interrupting power supply to the controller when the stop of the engine is determined. A method for stopping a diesel engine, the method comprising stopping the operation. 5. The diesel engine according to claim 4, wherein the stop determination step is a step of determining that the engine has stopped when a predetermined time has elapsed since the starter switch was turned off. How to stop. 6. The diesel engine according to claim 4, wherein the stop determination step is a step of determining that the engine has stopped when the number of revolutions of the engine has fallen below a predetermined set value. How to stop.