JPS6026143A - Diesel-engine provided with supercharger - Google Patents

Abstract

PURPOSE:To sustain a high output power and as well to reduce particulate substance in the operating condition of a supercharger, by providing an operation control device for actuating a compensating device upon high rotational speed operation of the engine and for stopping the same upon low rotational speed of the engine. CONSTITUTION:A Diesel engine 12 has a super-charger 52 and a fuel injection amount compensating device. Upon low rotational speed operation of the engine a rotary switch 64 opens so that no fuel increment compensation by the compensating device 34 is made. Upon high rotational speed of the engine the rotary switch 64 closes to actuate the compensating device 34 so that the maximum fuel injection amount increases. With this arrangement the discharge of particulate substance can be restrained, and as well a sufficient output power may be obtained due to the fuel increment compensation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fuel injection jA that corrects the maximum injection amount of fuel according to the air supply pressure, and a diesel engine with an overcharging device that is equipped with a correction device.

(Iie Prior Art) Diesel engines equipped with a supercharger in order to obtain high engine output are known. Such a supercharged engine is equipped with a fuel correction device that increases fuel in accordance with the increase in air by the supercharger. For example, Japanese Utility Model Application Publication No. 36-7037, 32 discloses the structure of a distributed type fuel injection ponder for easel and non-operation equipped with the above-mentioned fuel correction device.In order to obtain high output, It is essential to compensate for the increase in fuel according to the increase in air supply, but increasing the amount of fuel increases the amount of particulate matter such as carbine particles and hydrocarbon particles contained in the exhaust gas. If a large amount of particulate matter occupies a large amount, it becomes a problem from the perspective of pollution prevention.In the past, the fuel increase correction amount was limited in order to suppress the generation of this particulate matter, but it was said that this did not allow sufficient high output to be obtained. This will cause inconvenience.

(Object of the present invention) Therefore, the object of the present invention is to provide a supercharger that can secure the originally intended high output of a supercharged engine and reduce particulate matter. ..

(Configuration of the present invention) The above object of the present invention can be achieved by the following configuration. That is, the present invention provides a supercharger-equipped evil bonder equipped with a fuel injection amount correction device that increases the maximum fuel injection amount in consideration of an increase in the supply air pressure supplied to the engine due to supercharging. In the operating state of the feeder, an operation control device is provided that operates the correction device when the ennon rotates at high speed, and stops the operation of the correction device or restricts the operation to suppress the correction stage when the engine rotates at low speed. It is characterized by having been established.

According to the present invention, a control device is provided that controls the operation of a fuel injection amount correction device 1, which increases the maximum injection amount of fuel during supercharging, and this control device is particularly suitable for high-power fuel injection, where high output is convenient. When rotating, operate the opposite end correction device to the fuel 11,
In addition to increasing the maximum fuel injection amount in accordance with the increase in air supply pressure, the operation of the above-mentioned correction device is stopped at low rotation speeds,
Alternatively, the operation is regulated to cancel fuel increase correction or limit the amount of correction.

A diaphragm device operated by boost pressure can be used as the fuel injection amount correction device, and an example of the operation control device is a solenoid valve that controls the boost pressure to the fuel injection amount correction device. Note that the present invention is applicable to distribution type and outer type injection 71? It can be applied to any of the

(Effects of the present invention) With the above configuration of the present invention, fuel increase correction is performed in operating conditions where particularly high output is required, such as during high rotation and high load, thereby ensuring sufficient high output. be able to. Furthermore, when the Ennon is running at low speeds, the fuel increase correction is limited to 10 or 10 degrees, so particulate matter in the exhaust gas is reduced. In this case, the above correction is cut or limited during operation of the supercharger, which is particularly effective in reducing particulate matter. The main types of particulate matter are carbon particles, carbon particles, and hydrocarbon particles, while carbon particles are mainly caused by incomplete combustion due to over-enrichment of the air-fuel mixture. Welfare/Ko... Idoloka day?
This is based on the fact that unburnt soot is emitted as is due to misfires, etc. According to the present invention, multi-lobed air is introduced into the combustion chamber by the operation of the supercharger, which increases the compression ratio, increases the temperature of the mixed gas, and reduces the ignitability of the fuel. Same as above. Also, since the air-fuel mixture is diluted by -4 degrees, the combustibility is increased. Therefore, fuenzenki 9;t'a
Is it possible to effectively prevent misfires, etc., and achieve the above-mentioned effects? I can do G things.

(Description of Embodiments) (1) First Embodiment Referring to FIG. 1, an example in which the present invention is applied to a five-pil engine 12 equipped with a distributed fuel injection pump 10 is shown.

The fuel injection bonder lO moves reciprocatingly and rotatably,
A plunger 14 for delivering fuel is provided, and a control sleeve 16 for adjusting the amount of fuel delivered is slidably engaged with the plunger 14. The amount of fuel delivered from the sealant 14 depends on the position of the control sleeve 16. When the control sleeve 16 moves to the right in the figure, the fuel 11 increases. A governor lever assembly 22 consisting of a start lever 18 and a tension lever 20 is provided to adjust the position of the sleeve 16. Start lever 1
8 is a centrifugal force type with fly weight 24 is Pana 26
When the rotational speed increases, i.e., centrifugal force increases, the governor sleeve 28 pushes and moves the control sleeve 16 to the left via the fulcrum M. to reduce the amount of fuel. In addition, the tension lever 20 is linked with the accelerator pedal (not shown), so that when the accelerator pedal is depressed, the governor gear lever 20
0 K, the control sleeve 16 is pulled to the left and the control sleeve 16 is moved to the right via the fulcrum M□ to increase the amount of fuel. In addition, the tension pump 20 has a stock horn 932.
is engaged from the direction opposite to the pulling direction of the nasf O-ring 30, thereby limiting the fuel injection amount. That is, the maximum fuel injection amount is determined.

The position of this stone e32, that is, the maximum fuel injection amount, is controlled by a fuel injection amount correction device 34. The stopper 32 is rotatable around the fulcrum M2 9, and one end is connected to the tension lever 2 as described above.
0, and the other end is fitted with a correction device fit34 by a protrusion 32a.
t+, r+ slope 36a of the anoyasting rod 36
It is designed to be Mffl. The anoyasting rod 36 is configured to move up and down, thereby changing the contact position between the inclined surface 36a and the protrusion 32a of the stopper 32, and rotating clockwise 9 about the fulcrum M2 of the stone shaft 32. The amount that can be done changes. When the anoyasting rod 36 moves downward, the stone arm 32 is rotated clockwise 9
The maximum rotation amount increases, and the maximum fuel injection amount increases. The vertical movement of the adjusting rod 36 is controlled by a diaphragm device 38, which includes a pressure chamber 42 and a pressure equalization chamber 44 partitioned by a diaphragm 40. Adjusting rod: 36 &, j:, is attached to a diaphragm 40, and the diaphragm 40 is located at a balance position between the pressure in the pressurizing chamber 42, the pressure in the equalizing chamber 44, and the resultant force of the force of the Sgelinda 46. This determines the vertical position of the adjusting rod 36. Air supply pressure is applied to the pressurizing chamber 42 via a solenoid valve 48. The intake position of the supply air pressure is located downstream of the blower 54 of the supercharging member 52 of the intake air passage 50, and therefore, during the operation U1 of the power supply 52, the supercharging pressure is input to the booster IE 42. Ru.

In addition, this supply air 1 section power is supplied to the exhaust passage 6, which bypasses the turbine 58 of the supercharger 5z provided in the exhaust passage 56.
It is also introduced in the diaphragm device 63 for the pi/gas valve 62 that controls the pi/gas amount of 0: 1ltl). The solenoid valve 48 has an i! Jl rotation number switch 64
The rotation speed switch 64 is connected to open the solenoid valve 48 when the rotation speed exceeds a predetermined value. Supply pressure is introduced.

Next, to explain the operation, when the engine is at low rotation speed, the rotation speed switch 64 is open, and the solenoid valve 4 is open.
8 is closed. Therefore, no supply air pressure is introduced into the pressurizing chamber 42 of the diaphragm device 34, and the adjusting rod 32 is in the upper position.

In this state, the fuel increase correction is not performed by the correction device 34, and the maximum amount of rotation of the stone 32 is small. Therefore, the maximum fuel injection amount: is relatively small. When the rotational speed increases and exceeds a certain value, the rotational speed switch 64 closes and the diamond slam is 4.146g.

Air supply pressure is applied to the pressurizing chamber 42 of 34. As a result, the diamond slam 40 is pushed downward and the adjusting rod 36 is moved upward. As a result, the maximum rotation amount of the stopper 32 increases, and the maximum fuel injection [, 1] increases. That is, referring to Fig. 2, in the low rotational speed range of the engine, the maximum fuel injection amount is the same as the amount without the increase correction shown by line a, and when the rotational speed exceeds a certain level Due to the operation of the IE device 34, the maximum fuel injection value is corrected and increased by the shaded area in the diagram), and becomes the value shown by C. As shown in Figure 3, the amount of particulate matter discharged is less than the conventional exhaust 14 shown by line a by the shaded area in the rotation speed range lower than a certain rotation speed, and reaches the amount shown by line C. Decrease. This is the supercharger 52
Since the fuel volume increase correction is not performed even when the
This is because the mixture becomes leaner as the compression ratio increases. Therefore, in the low rotation range of the engine, it is possible to suppress the emission of :tQ-like substances, and in the high rotation range, a sufficiently high output can be obtained by fuel increase FF correction.

(2) Second Embodiment Referring to FIG. 7, the tree brother 1. An example is shown in which JlJ is applied to a diesel engine having a row-type twisted injection material pore.

In this example, the control rack 70 determines the fuel injection contact.
This position is regulated by a stone flat 32' linked to the annoysting rod 36', which determines the maximum fuel injection amount. The cut of this stopper 32'
t is limited by the Azoyasto screw 72, which limits the fuel increase correction amount. The correcting device 34' of this example is a Guitav 2m device similar to the seventh example, and the anoyasting rod 36' is connected to the pressurizing chamber 4.
2' is attached to the diaphragm 40'. A lunoid valve 48' for controlling the supply pressure introduced into the pressurizing chamber 42' is connected to a power supply terminal 76 via rotation speed switches 64' connected in parallel with each other. Therefore, the solenoid valves 48'r and 48' are energized when the number of rotations exceeds the one foot value, and introduce supply pressure into the pressurizing chamber 42'. Therefore, as in the first embodiment, it is possible to achieve high output in the high rotation range, and at the same time, in the low rotation range, it is possible to suppress the distraction of particulate matter.

In the control example described above, 4: + fee correction system ti111
Although the above is an ON-OFF fli control, the correction amount may be controlled in steps or may be controlled to change continuously.

[Brief explanation of drawings]

Fig. 1 schematically shows the system for controlling the fuel injection amount jE 1ill according to the present invention. Fig. 2 is a graph showing the relationship between the engine speed and the fuel injection amount. The figure is a graph showing the relationship between the emission of particulate matter and the engine rotational speed, and is a similar figure to the graph in another embodiment. Explanation of the symbols 10, 10'...Full injection pump, 14...Granminoya, ]6...Control sleeve, 20 Self-bunning lever, 32, 32'... Slipper, 34, 34'...Fuel injection amount correction device 1 (, 36,
36'...adjusting rod, 48, 48'
...Lunoid valve, 52...Supercharger, 64, (34'...Rotation speed switch. φ ring atmosphere degaku steel

Claims (1)

[Claims] In a diesel engine with a supercharger equipped with a fuel injection amount correction device that increases the maximum injection amount of fuel fuel 1 in response to an increase in the supply air pressure Tt supplied to the engine due to supercharging, the operating state of the supercharger In the above, an operation control device is provided which operates the correction device when the engine is running at high speeds, and stops the operation of the correction device described in iiJ when the engine is at low speeds, or restricts the operation to suppress the amount of correction. Features a supercharged easel ennon.