JPS60125750A - Fuel supplying apparatus for fuel-injection type engine - Google Patents

Abstract

PURPOSE:To prevent the definciency of fuel supplied to an engine at the time of high-load operation and to prevent occurrence of percolation at the time of low- load operation of the engine, by providing a control valve opened and closed according to the temperature, conditions of engine operation, etc. in a passage by-passing fuel injection valves. CONSTITUTION:A fuel supply passage 64 for supplying fuel to fuel injection valves includes a by-pass passage 76 by-passing primary injection valves 40, 42, and a control valve 78 opened and closed in response to a signal is provided in the by-pass passage 76. When the rate of fuel consumption is high, fuel is supplied to the downstream side injection valves 40, 42 also from the passage 76 for preventing the deficiency of fuel supplied to an engine. On the other hand, when the temperature of cooling water is higher than a predetermined value at the time of starting the engine, switches 80, 82, 84 are turned ON and a solenoid is energized, so that the by-pass passage is closed by the control valve 78. Since, in this state, fuel is passed only through the by-pass passage 64 and circulated at a relatively high speed, fuel is warmed slowly, so that occurrence of percolation is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a fuel supply device for a fuel injection engine.

(Prior Art) A fuel injection engine in which a plurality of fuel injection valves are arranged in series in a fuel supply passage and is equipped with a fuel pump that supplies fuel to these fuel injection valves is known, for example, from the Utility Model No. 44-/θ.
//Disclosed in Publication No. ♂. In the fuel supply system of this type of engine, the fuel injection valves are arranged in series, so in the high-load operation region of the engine that consumes a large amount of fuel, the fuel injection valve installed downstream of the fuel supply passage In order to solve the problem of insufficient fuel supply to the valve and to sufficiently supply fuel to the downstream fuel injection valve, a bypass passage that bypasses the upstream fuel injection valve is provided. It is possible to install it in the fuel supply passage, but
In a structure where a pinos passage is simply provided, the flow velocity in the fuel supply passage decreases in the low-load boiling region where fuel consumption is low, the residence time becomes longer, and the fuel is warmed and bubbles are generated. A collision phenomenon occurs, resulting in the problem of unstable fuel supply.

(Object of the present invention) An object of the present invention is to solve the shortage of fuel H supply in the high fuel dispersion region, and also to solve the above-mentioned somewhat collision problem. It is an object of the present invention to provide a fuel supply device for a fuel injection type engine.

(Configuration of the present invention) In order to achieve the above object, the present invention is configured as follows. That is, the present invention is a fuel supply device for a fuel injection engine equipped with a fuel injector that supplies fuel to several fuel injection valves arranged in series in a fuel supply passage,
A pi/gas passage provided in the fuel supply passage that connects a part of the fuel injector, and a pi/gas passage provided in the bypass passage that opens and closes according to changes in fuel supply conditions. The invention is characterized in that it is equipped with a control valve. The bypass passage is configured to bypass the fuel injection valve disposed on the side closer to the fuel injection valve, that is, on the upstream side. In addition, the above-mentioned control valve is controlled to open and close according to changes in fuel supply conditions such as engine operating conditions and engine temperature.1 For example, during high-load operation when the fuel flow rate in the fuel supply passage is large, Control is performed to open the bypass passage and close the piping/gas passage during low-load operation with little fuel flow. .

(Effects of the present invention) According to the present invention, the bypass passage is opened and closed according to changes in fuel supply conditions, and when there is a large amount of fuel consumption, the injection valve on the downstream side is also connected from the bypass passage. On the other hand, since C fuel is supplied, it is possible to prevent a shortage of fuel supply, and in a state where the fuel easily warms up in a low flow rate region, the bypass passage closes and the fuel flow area decreases. Decrease in flow rate is prevented, and therefore, it is possible to prevent slight cholecysemia.

(Description of Embodiments) Referring to FIG. 1, there is shown a schematic diagram of an engine using the fuel supply device of the present invention.
0 has two cylinders 7 and 12, inside of which a piston slides.
14 of course. A combustion chamber is formed above the cylinder 12.14, and the combustion chamber of cylinder 2 has two intake ports 16°18 and one exhaust port J? -) 20 are made of cedar.

Similarly, the second combustion chamber of cylinder 1) cylinder 14 has an intake air, I?
-) 22, 24 and an exhaust port 26 are formed.

The intake system of the engine in this example has a seventh intake passage 28 that supplies intake air to the combustion chamber in all operating ranges, and a secondary intake passage 30 that supplies intake air to the combustion chamber in a relatively high load range.
It is growing. The -7th intake passage 28 has a /next throttle valve 32 'e (+ff) for controlling the intake fi1, and is equipped with a sir-no-tank 34 downstream thereof. , surge tank 34
It branches downstream to form an intake passage 36°38, and the intake passage 36 connects to the intake port 16 of the cylinder 12.
8 communicate with the intake ports 22 of the cylinder 14, respectively. Inhalation 'Jv M* Q G ly I-) Request H% u4t') t: &r Mlp Shame L (-
A secondary injection valve 40 is provided for *+k diagonal 1 + 7, and a seventh injection valve 42 is provided in the intake passage 38 .

The quaternary intake passage 30 has the same configuration as the primary intake passage 28, and includes a secondary navy blue throttle valve 44 and a surge tank 46 downstream thereof. Then, it branches downstream of the surge tank 46 to form an intake passage 48 and an intake passage 5o. The intake passage 48 communicates with the secondary intake port 18 of the cylinder 12, and a secondary injection valve 52 for injecting and supplying fuel to the passage is provided in the middle. Intake passage 5
o communicates with the secondary intake port 24 of the cylinder 14, and a secondary injection valve 54 is provided in the middle thereof. The seventh intake passage 28 and the secondary intake passage 3o are formed by branching from the main intake passage 56, and the main intake passage 56 is provided with an air flow meter 58 for measuring intake air. . Further, the exhaust port 20 of the cylinder 12 is the exhaust passage 60. The exhaust gases #-) 26 of the cylinders 14 communicate with the exhaust passages 62, respectively. Fuel injection valve 40, 4
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-1sa 1-It is supposed to be done. The supply passage 64 has fuel>J? It is inserted below the surface of the mineral liquid in the fuel tank 70 via the pump 66 and filter 68. The injection valves 40.42, 52.54 are connected in series to the supply passage 64, and a pressure regulator 72 for regulating fuel pressure is connected downstream of the injection valve 52 on the most downstream side. Further, the pressure regulator 72 is connected to the fuel tank 70 via a return passage 747,
The supply passage 64 and the return passage 74 form a fuel circulation path. The supply passage 64 is provided with a bypass passage 76 that bypasses the seventh injection valve 40.42.
6 is provided with a control valve 78 that opens and closes the passage 76 in response to a signal. The solenoid of the control valve 78 is connected to a battery power source 86 via an ignition switch 80, a start switch 82, and a water temperature switch 84. A controller 88 is provided to control injection of the fuel injection valves 40, 42, 52, and 54. The controller 88 includes a rotation speed sensor 90 that detects the engine rotation speed, and an intake sensor 90 that detects the engine rotation speed.
Using the signal from the air flow meter 58 representing tt- and the ignition noise as input, the fuel +! l' outputs an opening/closing command signal to the bullets 40, 42, 52, and 54. Seven examples of the circuit of the controller 88 are shown in FIG. 2, and the signals from the rotation speed sensor 90 and the air flow meter 58 are manually inputted to the injection amount calculation circuit 92 of the controller 88 ◇The injection amount calculation circuit 92 is The fuel injection air is determined from the engine speed and the intake air, and the corresponding signal is sent to the function circuit 94 for the seventh injection valve 40°42 and the secondary injection valve 52.54.
output to the function circuit 96 for use. The function circuits 94 and 96 have output values corresponding to function values corresponding to the output from the injection amount calculation circuit 92. In this case, the open number circuit 9 for the seventh injection valve
4 has an output value as shown in FIG. 3, and the function circuit 96 for the secondary injection valve has an output value as shown in FIG. That is, the function circuit 94 for the seventh injection valve is approximately proportional to the injection layer calculation circuit output, and once the calculation circuit output reaches a certain value, the function circuit output remains approximately constant regardless of changes in the calculation circuit output value. maintained. In addition, the open number circuit 96 for the secondary injection valve has a function output value of 0 when the arithmetic circuit output value is small, and after the arithmetic circuit output value exceeds a certain value, it becomes almost proportional. increase These function values correspond to the fuel injection wind. The outputs of the function circuits 94 and 96 are /
The signals are input to a secondary injection valve drive circuit 98 and a secondary injection valve drive circuit 100, respectively. These circuits 98 and 100 are also supplied with an ignition valve from an ignition coil 102. The primary injection valve drive circuit 98 and the secondary injection valve drive circuit 100 operate the seventh injection valves 40, 42 and 2 at a valve opening period according to the output value of the function circuit 94 and 96 and at a timing according to the ignition pulse signal. Next song wariben 52, 54
In response, the full valve opening command signal is output.

In this example, when the cooling water temperature is higher than the predetermined temperature when the engine is started, the switches 80, 82, and 84 are turned on, the lunoid is excited, and the control valve 78 is turned on.
supply passage 64, thereby allowing fuel to flow through the supply passage 64.
It circulates only within. Under these conditions, the fuel circulates within the passage 64 relatively quickly, making it difficult for the fuel to warm up.
- Moderate - Collision is prevented from occurring. FIG. 5 shows the case where the present invention is applied to a pond type engine. Regarding the same parts as shown in Figure 1,
They will be indicated by the same reference number and the explanation will be omitted. The engine 10' in this example is of a cylinder type, with two cylinders 12a,
12b, 12c, and 12d. Each cylinder has seven intake ports 2-) 16a, 16b, 16c, 16d
and one exhaust bow 120a, 20b, 20c, 20d
Intake passages 36a, 36b, 36c, and 36d branched from the main intake passage 56' having the Jano tank 34' communicate with the intake port, respectively.In the middle of these passages, there are Injection valve 40
a, 40b, 40c, and 40d are provided, respectively. Exhaust ports 20a, 20b, 20c *20d have exhaust passages 60a, 60b, 60c.

60d are in communication with each other. Injection valve 40a.

40b, 40c, and 40d are supplied with fuel through a supply passage 64'. Injection valves 40a, 4 are provided in the supply passage 64'.
A bypass passage 76' is provided which opens and closes the passage 76'.
' is provided. The controller 288' in this example not only outputs open/close signals for the fuel injection valves 40a, 40b, 40c, and 40d, but also outputs a control signal for the fti* & l valve 78'. . A circuit example of the controller 88' will be explained with reference to FIG. The controller 88' of this example, like the controller 88 of the previous example, is equipped with an injection amount calculation circuit 92 that inputs the intake needle and the engine speed and outputs an output value corresponding to the fuel V + injection amount. The output signal of the injection valves 40a, 4
0b.

Injection valve drive circuit 9 that outputs open/close signals of 40c and 40d
8 is directly powered by humans. In addition, the output of the arithmetic circuit 92 is also manually inputted to a comparator circuit 104, which compares the setting value corresponding to a predetermined fuel injection company with the Jinkai C3, and if the manual output value is small, that is, 4, ( )・The fuel injection is at the specified h1
If it is less, output No. 1d of Noireperu. This Ir1 is manually increased in width by the expansion circuit 106 and controlled.
++The valve 78' is manually operated to open and close the valve 78'.

Therefore, in this example, 1, when the engine cooling water temperature is higher than the predetermined temperature at startup, the control valve
The solenoid 78' is energized and the valve 78' closes the bypass passage 7.
6' is closed, thereby preventing percolation, and if the fuel injection surface is small even after starting, the control valve 78' closes the bypass passage 76', so that the fuel circulates quickly. Ratioshojo is prevented.

In addition, since the control valve 78' opens the bypass passage 76' in the furnace where there are many injections, the downstream
1 can provide sufficient fuel.

[Brief explanation of the drawing]

FIG. 1 shows an engine 11jJ according to the invention/embodiment.
Figure 2 is a control circuit diagram showing seven examples of controller control circuits, Figures 3 and 3 are graphs showing the relationship between the function circuit output and the injection amount calculation circuit output, and Figure 5 is the main circuit diagram. A schematic diagram of an engine according to an actual example of the invention, FIG. 6 is the third
- FIG. 7 is a control circuit diagram showing seven examples of the control circuit of the controller of the actual +71μ example shown in the figure. Code 1 Explanation 10...Engine. 12.14 ... shilling. 40, 42, 52, 54...fuel injection valves. 66... Zuto (? fee ponno. 70... iW fk tank. 76... bypass passage. 78... control valve.

Claims (1)

[Claims] A "fuel injection type" fuel supply device comprising a fuel pump that supplies fuel to a plurality of fuel injection valves arranged in series in a fuel supply passage, wherein the fuel injection valve is provided in the fuel supply passage. A fuel supply device for a fuel injection type engine, comprising: a bypass passage that pinoxes a part of the 11427 passage; and a control valve that is provided in the pinoy passage and opens and closes the 11427 passage according to changes in fuel supply conditions. .