JPH03185235A - Smoke reducing device in quick acceleration of diesel engine - Google Patents

Abstract

PURPOSE:To suppress the generation of smoke in a quick acceleration by fixing a solenoid to a fuel increase control surface of a fuel injection pump housing, and linking one end of a start spring to an advance/retreat piece of the solenoid. CONSTITUTION:In a fuel injection amount control device, a governor sleeve 7 is moved forward and backward following the opening and closing swaying of a governor weight W on a governor shaft 5, and its movement amount is transmitted to the control rack 9 of a fuel injection pump 3 through a governor lever 8. A thrust lever 10b in a fork lever 10 linked to the rack pin 9a of the rack 9 is enforced by a start spring 19, and thereby the rack 9 is enforced to the fuel increasing side R. In this case, a link 21 to fix one end of the start spring 19 is composed of an advance/retreat piece of a solenoid 22, and the solenoid 22 is controlled to advance its advance/retreat piece 21 to the fuel reducing side L when the engine rotation frequency exceeds a specific rotation frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for reducing smoke generated when a diesel engine is rapidly accelerated.

(Prior art) In diesel engines, the amount of movement of the control rack of the fuel injection pump is adjusted by balancing the governor force from the governor weight attached to the rotating shaft of the engine with the governor spring force acting on the governor lever. The engine speed is controlled by controlling the amount of fuel injection, but conventionally, in order to start the engine smoothly, a fork lever that engages the governor lever with the control rack and a governor ring are used to operate the engine. In order to be able to supply a larger amount of fuel to the combustion chamber than the maximum fuel injection amount during operation when starting the engine, the spring lever is stopped by a fuel limiting pin, and the fork lever is A fork lever and a spring lever are interlocked and connected by a torque spring in order to apply a start spring to the engine and increase the stickiness of the engine under heavy loads.
Publication No.).

(Problem to be solved) However, with conventional governor devices, when sudden acceleration is performed, the tension of the governor spring increases rapidly, but since the engine speed is low at that time, it does not act on the fork lever. The governor force that is being used only outputs a force that corresponds to the actual rotation speed.

As a result, the balance between the governor force and the governor force is lost, causing the governor lever to move significantly toward the fuel increase side, but when this movement occurs, the spring lever is stopped by the fuel limiting pin, and the spring lever and fork lever Since the torque spring is interlocked with the torque spring, the resultant force of the accumulated force of the torque spring and the spring force of the start spring acts on the fork lever, moving the fork lever from the maximum fuel injection position to the fuel increase side. There is a problem in that the amount of fuel supplied from the fuel injection pump may be abnormally increased and smoke may be generated.

The present invention has been made with attention to such points, and an object of the present invention is to reduce the amount of smoke generated even when there is a sudden acceleration operation.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention fixes a solenoid to the fuel increase side wall surface of the fuel injection pump housing chamber, and connects one end of a start spring to the retractable element of this solenoid. By engaging the solenoid and activating the solenoid based on the engine speed, when the engine speed exceeds a predetermined speed, the retractor is operated to move toward the fuel reduction side.

(Function) In the present invention, a solenoid is fixed to the fuel increase side wall surface of the fuel injection pump housing chamber, one end of the start spring is engaged with the retractable element of this solenoid, and the solenoid is activated based on the engine speed. As a result, when the engine speed reaches a predetermined number of revolutions or more, the retractor is configured to move forward to the fuel reduction side, so when the engine is started, the retractor of the solenoid maintains its retracted position. The start spring is to be tensioned with sufficient tension,
Although the starting fuel increase operation can be performed reliably, since the engine is rotating at a predetermined number of revolutions or higher while the engine is running, the solenoid is activated to increase the fuel quantity at the engagement part of the start spring. This will cause the spring force of the start spring to decrease.

For this reason, the start spring force decreases at times other than when the starting operation is performed, so even if a sudden acceleration is performed, the spring lever h < fuel n where the governor puller is acting is stopped after the brake is stopped by the limit bottle. , this means that the start spring force that cooperates with the torque spring force has weakened.
The control rack will no longer exceed the maximum fuel injection position and overrun to the starting amount increase side.

(Embodiment) The drawings show an embodiment of the present invention, with FIG. 1 being an explanatory view taken out of the main parts, and FIG. 2 being a longitudinal sectional view of the fuel injection amount control device portion.

This fuel injection amount control device is suitable for diesel engines (E).
A fuel injection pump (3) is arranged in the pump accommodation chamber (2), and a fuel injection camshaft (
4) and a governor shaft (5), the fuel injection camshaft (4) and governor shaft (5) are interlocked and connected to a crankshaft (not shown), and a weight holder (6) is arranged on the governor shaft (5). ), and also attach the governor sleeve (7) to the governor shaft (5).
) is fitted over the governor sleeve (7) so as to be movable in the axial direction of the governor shaft, and moves in and out as the governor weight (W), which is supported by the weight holder (6) so as to be swingable and openable, moves in and out as the governor weight (W) swings open and close. ) can be controlled to move the fuel injection pump (3) to the control rack (9) via the governor lever (8).

The governor lever (8) is a fork lever (10) that is engaged with the rank bin (9a) of the hunt roll rack (9).
and a spring lever (12) that locks one end of the governor spring (11), and applies the thrust force (governor force) (F) of the governor sleeve (7) to the fork lever (10). the fork lever (10) and spring lever (1).
2) are configured to interlock with each other via a torque spring device (13), and the fuel injection pump (3
) to control the control rack (9). A speed regulating lever (15) is swingably supported on the pump chamber lid disposed to cover the side opening of the pump housing chamber (2), and a governor spring (11) is attached to the speed regulating lever (15). The other end is engaged. Further, the lever shaft (16) of the speed regulating lever (15) passes through the pump chamber cover, and a speed change lever disposed at its outer end is fixed.

In addition, the fork lever (10) is a governor force (F
) The lever arm part (10a) that swings by receiving the
It consists of a thrust lever (10b) that is slidably attached to the tip of the bar arm (10a), and the rack bin (9a) of the controller (9) is connected to the lever arm (loa) and the thrust lever (10b). The response sensitivity of the governor is increased by holding the governor between the two. The control rack (9) is biased toward the fuel increase side (R) between this thrust lever (10b) and the pump housing wall (18) located on the fuel increase side (R) of the control rack (9). The start spring (19) is engaged. Further, an idle limit spring (20) is arranged on the fuel reduction side (L) of the thrust lever (10b) to prevent the control rack (9) from accidentally moving to the no-fuel injection position.

Pump chamber wall (18) of start spring (19)
The spring engaging portion (21) that locks the side end is composed of a retractable element of a solenoid (22). This solenoid (22) is configured to be activated based on the rotation speed detected by the engine rotation speed detection means (23), and when the engine speed is low such as when starting the engine, it is operated as shown in FIG. a
), the solenoid (22) maintains the posture in which the retractor (21) is retracted, and the start spring (19)
) maintains sufficient tension, enters the operating state, and the engine speed increases until it reaches a predetermined speed (e.g., idle speed).
When the rotation speed reaches the engine rotation speed detection means (2
3) and the power supply path (24) to the solenoid (22).
The switch (25) inserted in the
), the solenoid (22) is actuated to advance the retractor (21) and displace the locking position of the start spring (19). Therefore, while the engine is running, the engaging portion (21) of the start spring (19) on the side of the pump housing chamber is displaced toward the fuel reduction side, so that the start spring force acting on the fork lever (10) is reduced. become.

Therefore, when you suddenly accelerate by operating the gear shift lever, the governor spring force (Gs) increases rapidly and the governor lever (8
) to the fuel increase side, but at this time, the spring lever (12) is stopped by the fuel restriction bin (23) at the position corresponding to the maximum fuel injection position, so the fork lever (1o) is then moved to the torque spring side. It tries to move to the fuel increase side (R) by the accumulated pressure of the device (13) and the spring force of the start spring (19), but as mentioned above, the spring force of the start spring (19) is decreasing. It moves by the accumulated force of the torque spring device 03), the amount of overrun becomes small, and smoke generation is suppressed as much as possible.

FIG. 3 shows a modification of the present invention, in which a switch (25) is connected to the power supply line (24) to the solenoid (22) and is switched based on a command from the engine rotation speed detection means (23), and a switch (25) is switched based on the engine temperature. Temperature switches (26) are arranged in series to restrict the operation of the solenoid (22) while the engine temperature has not risen sufficiently, such as immediately after the engine is started. Reference numeral (27) in the figure represents a power source such as an alternator.

In addition, the engine rotation speed detection means in each of the above embodiments is not limited to a device that directly detects the rotation speed, such as a tachometer, but may also be used to detect the engine rotation speed by detecting intake negative pressure or turbocharger boost pressure. You may use what you want to detect.

Figures 4 and 5 show another configuration for suppressing overrun of the control rack (9) to the fuel increase side.
What is shown in the figure is a rack pullback spring (29) disposed between the fuel reduction side end of the control rank (9) and the fuel reduction side wall (28) of the pump chamber (2). ) on the side of the pump chamber wall (28) is constituted by a pressure actuator (30), and this pressure actuator (30
) is connected to the engine intake passage (32) which is connected to the turbocharger (31), and by detecting changes in the engine speed based on changes in boost pressure, it is possible to detect changes in engine speed during sudden engine acceleration operations. The pressure actuator 1ll (30) is actuated by the change in boost pressure at , increasing the tension of the rack pullback spring (29) to prevent the rank from overrunning toward the fuel increase side. .

FIG. 5 is a modification of the one shown in FIG. 4, in which the engaging portion of the rank retraction spring (29) on the pump chamber wall side is formed by an electromagnetic solenoid (33).
33) is connected to the alternator (34) which is driven by the engine.
). The alternator (34) generates a current that changes depending on its rotation speed, and the operating amount of the electromagnetic solenoid (33) changes depending on the engine rotation speed. Then, by detecting the engine rotation speed based on changes in the current value generated by the alternator (34), when the engine reaches a predetermined rotation speed, the electromagnetic solenoid (33) is activated to reduce the tension of the rack retraction spring (29). By increasing the amount, it is possible to prevent the rack from overrunning toward the fuel increase side during a sudden acceleration operation.

(Effects) The present invention fixes a solenoid to the fuel increase side wall surface of the fuel injection pump housing chamber, engages one end of the start spring with the retractable element of the solenoid, and operates the solenoid based on the engine speed. As a result, when the engine speed exceeds a predetermined number of revolutions, the solenoid's retractor is configured to move forward to the fuel reduction side, so when the engine is started, the solenoid's retractor maintains its advancing position, and the starting position is maintained. Although the spring is tensioned with sufficient tension and the starting power increase operation can be performed reliably, when the engine is running, the solenoid is The advancing operation displaces the engaging part of the start spring to the fuel decreasing side, reducing the spring force of the start spring, and the control rack exceeds the maximum fuel injection position and overruns to the starting increasing side due to sudden acceleration operation. This makes it possible to suppress the occurrence of smoke during sudden acceleration operations.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is an explanatory diagram of the main parts taken out, FIG. 2 is a vertical sectional view of the fuel injection amount control device, and FIG. 3 is a modification of the present invention. FIG. 1 is a diagram showing an example, and FIGS. 4 and 5 are diagrams corresponding to FIG. 1 showing another configuration for suppressing the overrun of the control valve toward the fuel increase side. 2... Fuel injection pump housing chamber, 3... Fuel injection pump, 8... Governor lever, 9... Control rack, 10... Fork lever, 11... Governor spring, 12... Spring Lever, 13...Torque spring device, 15...Governing lever, 18...(
2) Fuel increase side wall surface, 19... Start spring, 21... Retractable element, 22... Solenoid, L...
Fuel reduction side.

Claims (1)

[Claims] 1. Control rack (9) for fuel injection pump (3)
a fork lever (10) that engages with the speed control lever (10);
5) and a spring lever (12) interlocked and connected via a governor spring (11) constitute a governor lever (8), and a fork lever (10) and a spring lever (1)
2) are interlocked and connected via a torque spring device (13), and a start spring (19) is stretched between the fork lever (10) and the fuel increase side wall surface (18) of the fuel injection pump housing chamber (2). In a diesel engine equipped with a governor device, the fuel increase side wall surface (18) of the fuel injection pump housing chamber (2)
Fix the solenoid (22) to the
) by engaging one end of the start spring (19) with the retractable element (21) and activating the solenoid (22) based on the engine speed, when the engine speed reaches a predetermined speed or higher. , a smoke reduction device for a diesel engine during sudden acceleration, characterized in that it is configured to operate an inlet/outlet element (21) to advance to a fuel reduction side (L).