JPS63198749A - Fuel feed device for engine for ship pusher - Google Patents

Abstract

PURPOSE:To ensure a fuel feed state optimum to the running state of an engine, by a method wherein a change in orientation of an engine is detected, and according to the detecting result, an amount of fuel fed to an engine is regulated. CONSTITUTION:When an outboard machine 10, containing a propeller unit mounted inclinably between a trim down position and a trim up position, is applied to the stern plate of a ship, an angle sensor 32,detecting the trim angle of the propeller unit with a built-in engine, is mounted as an engine orientation detecting means. An output signal from the trim angle sensor 32 is inputted to a CPU 41 together with outputs from other sensors 33-36. In an engine orientation increase mode, based on an output signal from the trim angle sensor 32, duty control is made on a solenoid valve 26, situated in the fuel feed amount regulating pipe of a carburetor, so that an engine orientation increase stored in a memory is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application J] The present invention relates to a fuel supply system for engines for marine vessel propulsion such as outboard motors, inboard/outboard motors, and inboard motors.

[Prior Art] Marine propulsion devices are used by being installed in the engine room, stern board, etc. of ships. This marine propulsion engine is additionally equipped with a fuel supply source such as a carburetor and a fuel injection device, so that fuel supplied by the fuel supply source can be introduced into the combustion chamber of the engine via a fuel supply path.

[Problems to be Solved by the Invention] However, compared to automobile engines, marine propulsion engines are more sensitive to the unbalanced state of the ship's cargo, the acceleration state of the ship, the wave state, and the trim of outboard motors. Changes in the engine attitude tend to occur due to changes in the angle setting state, etc. The change in the engine attitude changes the relative positional relationship between the fuel supply source such as the carburetor and the combustion chamber. therefore.

When the combustion chamber is located at a higher level than the fuel supply source compared to the standard positional relationship, gravity acts as a resistance to the flow of fuel from the fuel supply source to the combustion chamber. The amount of fuel supplied to the combustion chamber will be lower than the standard supply amount.

As a result, inconveniences occur, such as a reduction in output that is not intended by the driver.

The present invention automatically increases or decreases the amount of fuel supplied to the engine according to changes in the engine's attitude, and changes the engine operating state to F! , the purpose is to ensure proper fuel supply conditions.

Means for Solving Problem E 1 The present invention provides an engine attitude detection means for detecting changes in the attitude of the engine, and an engine attitude detection means for detecting changes in the attitude of the engine, in a fuel supply system for a marine propulsion engine installed on a ship. The fuel supply amount control means adjusts the amount of fuel supplied to the engine based on the detection result.

[Operation] According to the present invention, the amount of fuel supplied to the engine is maintained at an optimal fuel supply state for the operating state of the engine by the control operation of the fuel supply amount control means based on the detection result of the engine attitude detection means. Automatically increased or decreased.

In other words, if the combustion chamber is positioned higher than the fuel supply source due to a change in the engine's attitude, for example, the gravitational resistance acting on the flow of fuel from the fuel supply source to the combustion chamber will increase. The amount of fuel supplied is increased to offset the decreasing tendency of fuel. On the other hand, if the combustion chamber is located lower than the fuel supply source, the tendency for fuel to increase due to the addition of gravity acting on the flow of fuel from the fuel supply source to the combustion chamber is offset. As such, the amount of fuel supplied is reduced.

According to the present invention, the shift force automatically increases or decreases the amount of fuel supplied to the engine according to changes in the engine's attitude.
It is possible to ensure fuel supply conditions that are optimal for the operating conditions of the engine.

[Example] Fig. 1 is a block diagram showing an example of the present invention, Fig. 2 is a schematic diagram showing an example of a vaporizer used in carrying out the present invention,
FIG. 3 is a schematic diagram showing an outboard motor to which the present invention is applied;
Figures (A) to (C) are wave charts showing control states in an embodiment of the present invention.

As shown in FIG. 3, the outboard motor 10 has a clamp brat 12 attached to the stern plate of a boat 11, and a swivel bracket 14 attached to the clamp brat 12 via a tilt shaft 13.
A propulsion unit 15 is supported on a swivel bracket 14 so as to be steerable.

16 is the clamp bracket 12 and swivel bracket) 14
This is a hydraulic trim sill installed between the two and allows the propulsion unit 15 to be trimmed up/down between, for example, the trim-down position shown by the solid line and the trim-up position shown by the two-dot chain line in FIG. The propulsion unit 15 includes an engine 17, and the engine 17 includes a carburetor 18.
, and an intake box 19.

As shown in FIG. 2, the carburetor 18 includes a float chamber 20 and an intake passage 21, and the intake passage 21 includes a choke valve 22,
A throttle valve 23 and a main discharge pipe 24 are provided. Further, the carburetor 18 has a fuel supply amount adjustment pipe 25 disposed inside the float chamber 20, a discharge port 25A of the adjustment pipe 25 is opened on the intake downstream side of the throttle valve 23, and an intake port 25B of the adjustment pipe 25. The opening and closing are controlled by a solenoid valve 26. The solenoid valve 26, as will be explained in detail later,
The ratio between the open time and the closed time of the suction port 25B is controlled, that is, the duty ratio is controlled. In addition, in FIG. 2, 27 is an air bleed pipe, and the solenoid valve 26 is supposed to control the duty ratio of the fuel passage before air bleed, but in the implementation of the present invention, the fuel passage after air bleed is The duty ratio may be controlled, that is, the fuel passes through the adjustment pipe 25 whose duty ratio is controlled by the solenoid valve 26, and is discharged from the discharge port 25A into the intake passage 21 by the intake negative pressure of the engine 17. The fuel is supplied to the combustion chamber via the illustrated fuel supply path.

The outboard motor 10 includes a control circuit for the carburetor 18 as shown in FIG.

In FIG. 1, 31 is a starter switch for the engine 17, 32 is a trim angle sensor for the propulsion unit 15, and 33 is a trim angle sensor for the propulsion unit 15.
34 is a throttle opening sensor for the carburetor 18, 35 is a knock sensor for the engine 17, and 36 is an engine speed sensor. Also, 41 is CP
U (microcomputer), 42 is a memory, 43 is a clock circuit, and 44 is a duty control circuit.

The following data (1) to (4) are written in advance in the memory 42 for fuel control corresponding to each operating state of the engine 17.

■Basic fuel supply amount A that is optimal for each combination of throttle opening and engine speed during normal operation of the engine 17 (for example, the optimal setting to minimize fuel consumption) (■Start increase amount required when starting the engine 17 ■Engine attitude #H amount required to offset the tendency of fuel increase/decrease due to changes in engine 17 attitude C) Engine 17
Temperature increase required to optimize its operating condition in response to temperature changes Φ Acceleration increase required when engine 17 accelerates [Co.] Necessary to eliminate knock when engine 17 knocks Knock increase F When this is the case, there is no need to consider improving the responsiveness of the throttle valve 23, so the throttle reduction G can be reduced in order to optimize fuel consumption. Based on the results and the data previously written in the memory 42, the optimal fuel supply amount for the current operating state of the engine L7 is determined in FIGS. 4(A) to 4(C).
) Calculate according to the flowchart. Duty control circuit 44
Based on the calculation result of the CPU 41, the solenoid valve 2 is operated at the duty ratio necessary to ensure the optimum fuel supply amount.
6 is driven and controlled.

That is, in this embodiment, the CPU 41. memory 4
2. Solenoid valve 2 based on duty ratio control circuit 44
6, the fuel control operations shown in FIGS. 14(A) to 14(C) are executed. Each mode constituting the above fuel control operation will be explained as follows.

(2) Starting increase mode Based on the output signals of the starter switch 31 and the temperature sensor 33, the solenoid valve 26 is controlled in duty ratio so that the starting increase ff1B stored in the memory 42 is executed. This start-up increase ends when the engine speed sensor 36 detects that the engine 17 continues to burn.

■Engine posture increase mode Based on the output signal of the trim angle sensor 32, the memory 42
The duty ratio of the solenoid valve 26 is controlled so that the engine attitude increase C stored in is executed.

(cold machine increase mode) Based on the output signal of the temperature sensor 33, the duty ratio of the solenoid valve 26 is controlled so that the temperature increase stored in the memory 42 is executed.

■Acceleration increase mode The rate of change of the throttle valve 23 is detected by differentiating the output signal of the throttle opening sensor 34, and the memory 42
To execute the acceleration increase E stored in
The idle valve 26 is subjected to duty ratio control.

(2) Knock increase mode Based on the output signal of the knock sensor 35, the solenoid valve 26 is controlled in duty ratio so that the knock increase F stored in the memory 42 is executed.

■Throttle reduction mode The output signal of the throttle opening sensor 34 detects that a constant throttle opening has continued for a certain period of time, and the solenoid is activated so that the throttle reduction G stored in the memory 42 is executed. Valve 26 is duty ratio controlled.

Next, the operation of the above embodiment will be explained.

According to the above embodiment, the amount of fuel supplied to the engine 17 is determined based on the detection result of the trim angle sensor 32 (CPU 4
1, the amount of fuel is automatically increased or decreased to ensure the optimal fuel supply state for the operating state of the engine 17.

That is, for example, if the combustion chamber is positioned higher than the carburetor 18 due to a change in the attitude of the engine 17, the gravitational resistance acting on the flow of fuel from the carburetor 18 toward the combustion chamber will increase. The amount of fuel supplied is increased to offset the decreasing tendency of fuel due to On the other hand, in the case where the combustion chamber is located lower than the carburetor 18, the tendency of increase in fuel due to the gravitational load acting on the soaking of fuel from the carburetor 18 toward the combustion chamber is offset. As such, the amount of fuel supplied is reduced.

Therefore, according to the embodiment described above, the amount of fuel supplied to the engine 17 can be automatically increased or decreased in accordance with the change in the attitude of the engine 17, and the optimal fuel supply state for the operating state of the engine 17 can be ensured.

Note that the present invention can also be applied to a fuel supply device for an engine such as an inboard motor or an outboard motor, which is an engine installed in a ship.

Further, in implementing the present invention, the engine attitude detection means may be directly disposed on the engine body.

Furthermore, in carrying out the present invention, when setting an increase/decrease in the amount of fuel supplied based on a change in the engine attitude, for example, the submersion level of the underwater exhaust port of an outboard motor becomes shallower as the propulsion unit is trimmed up, and the When the back pressure of the engine decreases and the amount of air taken into the engine increases, consideration can be given to increasing the amount of fuel in order to supply a larger amount of fuel to match the increase in the amount of intake air.

[Effects of the Invention] As described above, according to the present invention, the amount of fuel supplied to the engine is adjusted to the optimal amount for the operating state of the engine by the control operation of the fuel supply amount control means based on the detection result of the engine attitude detection means. Automatically increased or decreased to ensure supply status.

In other words, if the combustion chamber is positioned higher than the fuel supply source due to a change in the engine's attitude, for example, the gravitational resistance acting on the flow of fuel from the fuel supply source to the combustion chamber will increase. The amount of fuel supplied is increased to offset the decreasing tendency of fuel. On the other hand, if the combustion chamber is located lower than the fuel supply source, the tendency for fuel to increase due to the addition of gravity acting on the flow of fuel from the fuel supply source to the combustion chamber is offset. As such, the amount of fuel supplied is reduced.

Therefore, according to the present invention, the amount of fuel supplied to the engine can be automatically increased or decreased in accordance with changes in the attitude of the engine, thereby ensuring the optimal fuel supply state for the operating state of the engine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a vaporizer used in carrying out the present invention,
FIG. 3 is a schematic diagram showing an outboard motor to which the present invention is applied;
Figures (A) to (C) are flowcharts showing control states in an embodiment of the present invention. 10... Outboard motor, ti... Ship, 17... Engine, 32... Trim angle sensor (engine attitude detection means), 41... CPU (fuel supply amount control means). Agent Patent attorney Osamu Shiokawa 2nd session Figure 3 1st session (A)

Claims (1)

[Claims] (1) A fuel supply system for a marine propulsion engine installed and used on a ship includes an engine attitude detection means for detecting changes in the attitude of the engine, and an amount of fuel supplied to the engine based on the detection result of the engine attitude detection means. 1. A fuel supply device for a marine propulsion engine, comprising: a fuel supply amount control means for adjusting the fuel supply amount.