JPS5872633A - Fuel supply device of engine - Google Patents

Abstract

PURPOSE:To obtain sufficient power of an engine, by providing a regulator, in which the setting concentration of exhaust smoke is adjusted in accordance with a density condition of the atmosphere, and supplying a required quantity of fuel to the engine in case of low density of the atmosphere. CONSTITUTION:A regulator 67, comprising a reference value correcting circuit 68, adjusting reference voltage, and a density condition detector 69, detecting a density condition of the atmosphere, is providied to a reference voltage generator 63, showing the setting concentration of exhaust smoke, in a control circuit 61. When the density condition detector 69 detects a decrease of the density condition of the atmosphere, the reference value correcting circuit 68 adjusts the reference voltage in such a manner as to increase the setting concentration of exhaust smoke, and a maximum injection quantity controller 82 operates in such a manner as to supply a sufficient quantity of fuel to an engine, then sufficient power of the engine can be obtained even in case of low density of the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine fuel supply system that detects exhaust smoke concentration and automatically controls the pressure of fuel supply to an engine.

The fuel supply system of the engine is adjusted to supply the engine with an amount of fuel determined according to engine operating conditions 1aIK, such as intake air amount and engine rotational speed, so that the engine operates most efficiently. However,
In actual use, due to poor maintenance of the fuel supply system itself or the engine, control of the fuel supply amount may deviate from the normal state, resulting in inappropriate exhaust smoke concentration.

For this reason, Utsukai Showa 60-//'? In the case described above, the automatic fuel injection amount control device for the engine of No. The aim is to improve fuel consumption and exhaust smoke concentration.

However, when operating the Ennon at high altitudes where the atmospheric pressure is low, i.e. where the air is thin, there will inevitably be problems such as the amount of fuel being too large compared to the amount of intake air, and the mixing of air and fuel not being sufficient. The exhaust smoke concentration increases due to incomplete combustion, but at this time, based on the fuel injection amount control like the above-mentioned Utility Model No. If the engine load is regulated, the amount of fuel supplied will be small relative to the engine load, resulting in the problem of not being able to obtain the necessary engine output and impairing drivability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply device that can supply fuel to an engine so as to obtain sufficient ennon output at high places.

The present invention increases the set exhaust smoke concentration or stops the fuel supply amount control based on the exhaust smoke concentration when the intake air is thin, 1, supplies a sufficient amount of fuel to the engine, and thereby This is characterized by the ability to obtain the necessary Ennon output.

Specifically, the present invention includes a main control system that appropriately controls the amount of fuel supplied to one engine depending on the operating state, an exhaust smoke concentration detector that detects exhaust smoke concentration, and detection by this exhaust smoke concentration detector. A control circuit that compares the exhaust smoke concentration to a predetermined set exhaust smoke concentration and outputs a difference signal, and according to this difference signal, controls the engine exhaust smoke concentration to be below the set exhaust smoke concentration and a sub-control system consisting of an actuator that corrects the amount of fuel supplied, the density state detection detects the density state of intake air to the engine and outputs a detection signal indicating this density state. and an adjustment means for controlling the set exhaust smoke concentration value of the control circuit to be changed or to switch the auxiliary control system between active and non-active states according to the detection signal. This is a characteristic feature.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel supply system for an engine according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a fuel supply system for a diesel engine 1 equipped with a distribution fuel injection pump A, and in this figure, reference numeral 2 indicates an intake passage, and reference numeral 3 indicates an exhaust passage. The distribution type fuel injection bonding device has a housing 10, and inside the housing 10 there is a pump chamber 11 to which fuel is supplied and a cylindrical hole 11a communicating with the bonding chamber 11.
is formed and 1 is present. A granger 12 is disposed within the cylindrical hole 11a and distributes and pressure-feeds the fuel within the pump chamber 11 by rotating and reciprocating. A cam disc 13 is integrally fixed to one end of this grand gloss 12, and this cam disc 13
, along with the grinder 12, are rotated by the drive shaft 14 at a speed that is half the rotational speed of the engine.

The cam disc 13 is provided with the same number of face cams 13a as the number of engine cylinders, and this cam disc 13 has
By means of a granger spring (not shown), the face cam 13a is biased 4 degrees Celsius together with the planar gloss 12 so that the face cam 13a comes into pressure contact with the roller 15 which is fixed in position. It rotates while being pressed against the roller 15 on the fixed side and causes the plunger 12 to reciprocate by one cam lift.
6) 12as Central oil passage 12b1
Distribution slit 1 communicating with the discharge passage 17 of the housing 10
2C1 and a cutoff opening into the pump chamber 11/-
) 12d, and a cutoff sleeve 18 for opening and closing the upper cutoff port 12d is slidably fitted around the outer periphery of the plunger 12. The plunger 12 has a busy suction slot (12a) during its retraction.
By matching with the suction port 16, the fuel in the pump chamber 11 fed from the tank is sucked into the tip chamber 19, and then the frontispiece of the sylanger 12 and the forward movement cause suction YJ.
"-) 16 is compressed at the same time as it closes, and the distribution slit 12
By matching c with the discharge passage 17, the compressed high-pressure fuel is injected into the combustion chamber of a predetermined cylinder via the delino reparte 20, and then, when the granger 12 moves further, the cutoff port 12d is cut. off sleeve 18
By moving in the direction of extension and opening, the plunger 12
The internal high-pressure fuel is released into the pump chamber 11, the I-mocha decreases, and the injection ends. This Granja 1
The reciprocating motion of No. 2 is performed for the number of cylinders during each revolution of the plunger 12, and the fluid is sequentially injected into each cylinder from discharge passages 17 (only seven are shown) K provided at equal intervals around the outer circumference of the plunger 12. It is something that In addition, the increase or decrease in fuel injection amount is
Slide the cut-off sleeve 18, and
This is done by changing the effective stroke value 2, that is, by adjusting the opening timing of the cutoff port 12d.When the cutoff sleeve 18 moves to the left in the figure, the injection amount decreases, and conversely, when the cutoff sleeve 18 moves to the left in the figure, the injection amount decreases. The amount of injection increases when moving toward the opposite direction.

A half-all-speed pannier 21 is built in the upper part of the pump chamber 11, and the governor 21 adjusts the movement of the cut-off sleeve 18 according to the engine rotation speed to adjust the fuel injection amount. ). The governor 21 rotatably supports a governor gear 24 that meshes with a drive gear 23 fixed to a governor shaft 22 (+fN t-, and this governor shaft 22 is a drive shirt) 141C. A flyweight boulder 26 that is integrally formed with the governor gear 24 has a flyweight 25 incorporated therein. A governor sleeve 27 is slidably fitted to the governor shaft 22, and this governor XIJ
-7”27 is a 2504t flyweight based on centrifugal force.
[It is configured to slide along the governor shaft 22 depending on the operation.]

A tension lever 28 is attached to the tip of the governor sleeve 27.
are in contact with each other and are close to this tension lever 28.
A start lever 29 is arranged, and the tension lever 28 and start lever 29 are pivotally supported by a common first pin 31 fixed to a collector lever 30. A radbin 32 is installed in the ball at the lower end of the start tray/4-29, and this pole head via 32
VcW4 is configured to move the cutoff sleeve 18 in response to the rotation π of the engagement L and X start L//4-29 in the bottle hole 18a of the cutoff sleeve 18. The start lever 29 and tension lever 28 mentioned above
A start spring 33 is mounted between the two.

In the Howson IOK, a control lever 34 is pivotally supported via a shaft 35, and the control lever 34 is operatively connected to an accelerator pedal 37 via a cable or link 36 or the like. shaft 3
One end of a yoke 39 is attached to the inner end of the tension lever 28 via an eccentric pin 38, and an idle bin 40 that extends through the upper part of the tension lever 28 is connected to the narrow end of the yoke 39. Head 40 of this idle bin 40
An idle spring 41 is arranged on the IVIK of the tension lever a and the tension lever 28. The yoke 311 has a λ of the governor gelling 42 and the partial load spring 43.
Two compression springs are built in with a predetermined load, and when the angle of the control lever 34 increases, that is, the amount of depression of the accelerator pedal 37 increases, the °C yoke 39 moves to the left in the figure. The tension lever 28 is pulled to the left 9A by the increased tension K. It works like this. Note that the collector lever 30 is connected to the second pin 4.
41C to the housing 10, and is biased by a lower support ring 45, and its rotational position is adjusted by a full load adjustment screw 46.

Reference numeral 51 indicates movement 1i (
A maximum injection amount regulating device for regulating rotation -9ll,
The maximum injection amount regulating device 51 has a negative pressure chamber 53 defined by a diaphragm 52. This negative pressure chamber 53
communicates with the passage 54, and a spring 55 is compressed in this negative pressure chamber 53. An operating rod 56 is connected to the diaphragm 52 and has an engaging portion 56a consisting of a small diameter portion and a large diameter portion formed below the small diameter portion.

The engagement fa 56 a of the actuating rod 56 includes the bin 5
8 pressure engages one end 57a of the regulation lever 57 rotatably supported on the housing 10, and this regulation L/par 5
The other end 57b of the upper P tension lever 28 comes into contact with the other end of the lower P tension lever 28 so as to restrict the rotation of the upper P tension lever 28 in the fuel increasing direction (counterclockwise in the figure). Passage 54
There is a vacuum pump 59! A solenoid valve 60 is provided, and by controlling the opening and closing of this solenoid valve 60, the pressure in the negative pressure chamber 53 is adjusted and the maximum injection amount is adjusted.

The solenoid valve 60 is connected to a control circuit 61 that controls opening and closing of the iI solenoid valve. This control circuit 61 includes a comparison path 62, and one input terminal 6 of this comparator 62.
2aK is connected to a reference voltage generator 63 indicating a set exhaust smoke concentration, and this exhaust passage 3 is connected to the 11' air passage 3.
An exhaust smoke concentration detector 64 is provided which detects the concentration of exhaust smoke flowing through the exhaust gas and outputs an electric signal indicating this concentration. Terminal 621) K is connected. The exhaust AM degree detector 64 optically detects the exhaust smoke degree as shown in FIG.
It consists of a light receiver [1166] that receives light emitted from the light receiver. The light emitting section 65 consists of a light emitting diode 65a as a light source and a collimator lens 65b, and the light receiving section 66 is a phototransistor that transmits exhaust gas among the light from the light emitting section 65 and receives the light and converts it into t-tk. 66a
, a lens 66b1 that focuses the light onto the phototransistor 66a), and an amplifier 66c that amplifies the output of the phototransistor 66a.

In the above configuration, when the exhaust smoke concentration is less than or equal to the set exhaust smoke concentration, the control circuit 61 does not output a control signal, and therefore the solenoid valve 6e is in a closed state.

When the solenoid valve 60 is in the closed state l1i1 as described above, no negative pressure acts on the negative pressure chamber 53 and it is opened to the atmosphere, so that
The diaphragm 52 is biased downward by the spring 55 to lower the actuating rod 56, and accordingly, the regulating lever 57 is rotated clockwise in the figure to lower the actuating rod 56.
One end 5 of the regulation lever 57 comes into contact with the small diameter engaging portion 56a of the
7a is located at a retracted position where it does not interfere with the rotation of the tension lever 28 in the direction of fuel increase, and therefore, by releasing the rotation restriction of the tension lever 28, fuel injection is performed.
From this point onward, the maximum amount of fuel to be injected is supplied. On the other hand, when the exhaust smoke concentration falls below the set exhaust smoke concentration, the output of the exhaust smoke concentration detector 64 becomes lower than the reference voltage, so the comparator 62 outputs a control signal to open the solenoid valve 60. When the electromagnetic valve 60 opens in this way, negative pressure acts on the negative crown 53, biasing the diaphragm 52 upward against the spring force of the spring 55, and the f'l: force rod 56 rises accordingly. As a result, the regulation lever 57 comes into contact with the large-diameter engagement portion 56a of the actuating rod 56, and the regulation lever 57
Turn the tension lever 28 counterclockwise as shown in the figure.
The control position is set to restrict the rotation of the fuel in the fuel increase direction.
Therefore, by regulating the rotation of the tension lever 280, the maximum fuel injection amount of the fuel injection pump fAI''l is reduced and regulated.

”2. The maximum fuel injection amount of the fuel/XIt Denzo^ is controlled in accordance with the engine and engine operating conditions to achieve a pressure-increasing exhaust smoke concentration. Due to changes in air temperature or altitude, the increase may occur as shown in Figures 3 and 2. At this time, if the fuel injection amount is controlled based on the above-added exhaust smoke concentration value, the intake air density will increase as described above. In the operating range where the engine power decreases, the engine output becomes insufficient compared to the engine output required for drivability. Therefore, in one embodiment of the present invention,
The reference voltage generator 63 is provided with an adjustment device 67 for adjusting the reference voltage generated by the generator 63. This adjustment device 67 consists of a reference value correction circuit 68 that adjusts the reference voltage of the generator 63, and a density state detector 69 that detects density states such as atmospheric temperature and pressure and generates an electrical signal. There are 4. The reference value correction circuit 68 receives the electric signal output from the density state detector 69 and acts to increase the reference value, that is, the set exhaust smoke concentration when the air is thin.

In the above examples, we have explained the type that adjusts the reference value, that is, the set exhaust smoke concentration, as the adjustment device 5', but the type that stops the control system that controls the fuel injection amount based on the exhaust smoke concentration. σ]. In this embodiment, as shown in FIG. 5, a switch 70 is provided between the electric valve 60 and the control circuit 610, and control is performed by opening and closing the switch 70 @67'. This adjustment device 67' includes an atmospheric density state detector 69 similar to the above-mentioned adjustment device 67, and this density state detector 69 detects that the atmospheric density state has become below a reference value (dilute). It consists of a switch controller 71 which opens the switch 70 when the switch 70 is opened. This switch controller 71 operates and the switch 7
0 is opened, the output of the control circuit 61 does not reach the tfB valve 60, so the power supply valve 60 remains closed regardless of the output state of the control circuit 61. Therefore, the fuel supply amount is not controlled in accordance with the exhaust smoke concentration.

FIG. 6 shows the fuel supply amount control device of the present invention,
This is an example of application to a diesel engine equipped with a size-type fuel injection pump P having a plunger in U. The same parts as in FIG. In FIG. 6, reference numeral 80 is a fuel injection pump main body, and reference numeral 81 is a fuel control rack disposed within the pump main body 80, and one end of this fuel control rack 81 is connected to the link mechanism of the governor 21 and the control lever. 34 to the accelerator pedal 37. Reference numeral 82 is arranged opposite to the other end of the fuel control rack 81;
The fuel increase direction of this fuel control rack 81 (left side in the figure)
The maximum injection amount regulating device [82 is connected to a solenoid 83 that operates in response to a control signal from the control circuit 61, and one end thereof is connected to the solenoid 83. The other end is the fuel control rack 81
It touches the other end and is made by solenoid 83! The regulation lever 84 rotates to the regulation position to regulate the movement of the fuel control rack 81 in the fuel enrichment direction from JJK. The movement of fuel in the direction of increase is restricted,
It is configured to restrict the maximum fuel injection 1 to decrease.

Note that reference numeral 85 is a maximum movement adjustment screw that adjusts the maximum movement amount of the P fuel control rack 81 in the fuel increase direction via the regulation lever 84.

Therefore, in this embodiment, when the exhaust smoke concentration increases, the amount of movement of the fuel control rack 61 in the fuel increase direction is regulated, and the maximum fuel injection amount is regulated to decrease.
When the density of the atmosphere decreases, the regulating device 67 increases the set exhaust smoke concentration, thereby supplying a sufficient amount of fuel to the engine to obtain the required engine output.

It goes without saying that the control system shown in FIG. 5 may also be applied to this size fuel injection bong 7''B.

According to the present invention having the above-described structure, the control system that controls the fuel supply amount according to the exhaust smoke concentration can be adjusted to increase the set exhaust smoke concentration or to Since it is adjusted so that it is in the operating state,
If the atmospheric density is thin (then the truly necessary amount of fuel can be supplied to the engine and sufficient engine output can be obtained for the first to second time).

[Brief explanation of drawings]

FIG. 7 is a configuration diagram showing a diesel engine fuel supply system fi1 equipped with a distributed fuel injection pump according to an embodiment of the present invention, and FIG. A schematic diagram showing a smoke concentration detector; Figures 3 and ≠ are graphs showing changes in exhaust smoke concentration due to changes in intake air temperature and altitude; Figure 5 is a diagram showing a modification of the adjustment device; FIG. 6 is a configuration diagram showing an example in which the fuel supply device of the present invention is applied to a size-shaped fuel injection pump. A, 8... Fuel injection pump, 1... Diesel engine, 51... Maximum injection amount regulating device, 54... Passage, 59... Vacuum pump, 60... Electric foundation valve, 61...・
- Control circuit, 63...Reference voltage generator, 64...Exhaust smoke concentration detector, 67...Adjusting device, 68...Reference value sleeve stop turning kneel, 69...Density state detector. Patent applicant Toyo Kogyo Co., Ltd. Figure 3 Figure 4 Kunmo

Claims (1)

[Claims] A main control system that appropriately controls fuel supply to the engine according to operating conditions, an exhaust smoke concentration detector that detects exhaust smoke concentration, and a predetermined exhaust smoke concentration detected by the exhaust smoke concentration detector. a control circuit that compares the set exhaust smoke concentration with the set exhaust smoke concentration and outputs a difference signal; and an actuator that corrects the fuel supply amount so that the engine exhaust smoke concentration is equal to or less than the set exhaust smoke concentration according to this differential signal pressure. A density state detector detects the density state of intake air to the engine and outputs a detection signal indicating this density state; 1. A fuel supply device for an engine, comprising: an adjusting means for controlling a set exhaust smoke concentration value of a circuit or switching the sub-control system between an activated state and a deactivated state.