JPH04330342A - Internal combustion engine control device - Google Patents

Abstract

PURPOSE:To stabilize an engine output and rotation by detecting the trim angle of an engine for an outboard motor with a ship hull and controlling a fuel injection amount based on the trim angle, in an internal combustion engine control device for an engine for an outboard motor. CONSTITUTION:A fuel injection amount setting generator 18A decides a fuel injection amount based on detecting information from an engine speed detector 12, am intake air amount detector 13, and a crank angle detector 17. A trim angle is inputted from a trim angle detector 20, and a detecting trim angle is compared with set angles in a plurality of stages. When the detecting trim angles is below a set angle at each stage, an increase in a fuel injection amount is determined according to the detecting trim angle, and a computed fuel injection amount is corrected. A pulse signal having a pulse width responding to a corrected fuel injection amount is outputted to an injector 19.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine control device for an outboard motor engine.

0002

2. Description of the Related Art In an outboard motor, the tilting angle of the outboard motor with respect to the hull, that is, the trim angle, is adjusted in order to increase the efficiency of the propeller in accordance with the attitude and speed of the ship. In other words, in outboard motors, the feel and acceleration of the boat are improved by changing the trim angle of the outboard motor engine.

A conventional example will be explained with reference to FIGS. 6 and 7. FIG. 6 is a side view showing the entire outboard motor equipped with a conventional internal combustion engine control device.

[0004] In FIG. 6, an outboard motor 1 is attached to a stern plate 2a of a hull 2 via a clamp bracket 3. A swivel bracket 5 is rotatably attached to the clamp bracket 3 around a tilt axis 4, and a drive unit 6 of the outboard motor 1 is attached to the swivel bracket 5.
are connected. There is an engine unit 7 on the top of the drive unit 6, and a propeller 8 is attached on the bottom.

Then, the swivel bracket 5 is tilted up or down by a tilt cylinder 9, and the swivel bracket 5 is trimmed by two trim cylinders 10. The steering bracket 11 performs steering by rotating the drive unit 6 with respect to the swivel bracket 5 around a steering shaft (not shown).

Although not shown, the tilt cylinder 9 and the trim cylinder 10 are expanded and contracted by hydraulic pressure from a hydraulic pump driven by an electric motor to tilt up or down and adjust the trim angle. This trim angle adjustment is performed by controlling the rotational direction and rotational speed of the electric motor. By adjusting the trim angle, the direction of the thrust of the propeller 8 is adjusted according to the inclination of the ship body or the speed of the ship, thereby obtaining optimal ship speed, fuel consumption, and acceleration.

FIG. 7 is a block diagram showing a conventional internal combustion engine control device. In FIG. 7, 12 is an engine speed detector, 13 is an intake air amount detector, 14 is a reference angle signal generator, 15 is a crank rotation angle signal generator, 16 is a microcomputer (hereinafter referred to as "microcomputer"), 17
is a crank angle detector, 18 is a fuel injection amount setting generator,
19 is an injector. Note that the crank angle detector 17 and the fuel injection amount setting generator 18 are S/W.

A pulsar coil (not shown) is fixed to the engine body within the engine unit 7. The plurality of permanent magnets provided around the crankshaft each oppose the pulsar coil once during one rotation of the crankshaft. Therefore, one electric pulse is induced in the pulser coil for each cylinder for each rotation of the crankshaft.

A ring gear that receives rotational force from the starter when the engine is started is fixed to the outer periphery of the rotor, and a crank rotation angle signal generator 15 that is fixed to the engine body is opposed to the outer periphery of this ring gear. It is located. The crank rotation angle signal generator 15 generates electric pulses corresponding to each meshing tooth of the ring gear as the crankshaft rotates.

[0010] That is, the pulsar coil is connected to one of the crankshafts.
During rotation, pulses for the number of cylinders each corresponding to a constant angular position of the crankshaft, that is, a reference angle signal of the crankshaft, are generated. Therefore, the pulsar coil functions as a reference angle signal generator 14 for the crankshaft, and by counting the number of pulses generated by the crank rotation angle signal generator 15 after the pulse generation point of the pulsar coil, the angular position of the crankshaft can be detected. There is.

The pulsar coil also functions as an engine speed detector 12. In other words, the pulsar coil generates pulses equal to the number of cylinders per rotation of the crankshaft, so by counting the number of pulses generated by the pulsar coil within a unit time, the rotational speed of the crankshaft, that is, the engine speed can be detected. becomes possible.

[0012] A throttle opening detector consisting of a potentiometer serving as the intake air amount detector 13 generates a voltage corresponding to the rotation angle of the throttle valve which rotates in accordance with the operation amount of the throttle wire, and detects the opening of the throttle valve. Therefore, the amount of intake air into each cylinder can be detected.

The microcomputer 16 is fixed to the engine body and is shown in FIG.
As shown in FIG. 2, it is composed of a crank angle detector 17 and a fuel injection amount setting generator 18, and controls an injector 19. As described above, the crank angle detector 17 counts the number of pulses generated by the crank rotation angle signal generator 15 after the pulse generation point of the pulser coil serving as the reference angle signal generator 14, and detects the angular position of the crankshaft. .

The fuel injection amount setting generator 18 controls the fuel injection amount of the injector 19 based on the engine speed, intake air amount, and crank angle. That is, the fuel injection amount is controlled by the pulse width of the pulse signal sent from the fuel injection amount setting generator 18 to the injector 19.

[0015]

SUMMARY OF THE INVENTION In the conventional internal combustion engine control device as described above, the trim angle of the outboard motor engine is changed in order to improve the feeling and acceleration of the boat. At this time, the attitude of the engine, that is, the attitude of the intake passage to the fuel chamber changes due to a change in the trim angle. Air is insensitive to changes in engine attitude, but
The injected fuel changes sensitively due to changes in the attitude of the intake passage. Therefore, there is a problem in that the mixture ratio of the air-fuel mixture supplied to the engine changes due to a change in the trim angle, resulting in a decrease in engine output. That is, there was a problem in that sufficient engine output or stable engine rotation could not be obtained.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an internal combustion engine control device that can obtain sufficient engine output and stable rotation.

[0017]

[Means for Solving the Problems] An internal combustion engine control device according to the present invention includes the following means. [1] Trim angle detection means for detecting the trim angle of the outboard engine with respect to the hull. [2] Fuel injection amount control means for controlling the fuel injection amount to the outboard engine based on the trim angle.

[0018]

In the present invention, the trim angle of the outboard engine relative to the hull is detected by the trim angle detection means. Further, the fuel injection amount control means controls the fuel injection amount to the outboard engine based on the trim angle.

[0019]

【Example】

Example 1. The configuration of Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing a first embodiment of the present invention, in which an engine speed detector 12 other than a fuel injection amount setting generator 18A and a trim angle detector 20 is shown.
~The crank angle detector 17 and the injector 19 are exactly the same as those of the conventional device described above.

FIG. 2 is an enlarged view of the vicinity of the trim angle detector of an outboard motor equipped with the first embodiment of the present invention. The main body of the trim angle detector 20 is fixed to the clamp bracket 3 and has a rotating lever 2 that comes into contact with the swivel bracket 5.
1. As the drive unit 6 tilts up, the swivel bracket 5 also rotates upward, and the rotation lever 21 in contact with the swivel bracket 5 also rotates. This movement of the rotary lever 21 is converted into an electrical signal within the body of the trim angle detector 20.

By the way, the trim angle detecting means of the present invention is composed of the trim angle detector 20 in the first embodiment of the present invention described above, and the fuel injection amount controlling means of the present invention comprises:
In the first embodiment, the microcomputer 16 includes a fuel injection amount setting generator 18A and a crank angle detector 17.

Next, the operation of the first embodiment described above will be explained with reference to FIGS. 3 and 4. FIG. 3 is a flowchart showing the operation of the fuel injection amount setting generator 18A according to the first embodiment of the present invention, and FIG. 4 is a graph showing the relationship between the trim angle and the fuel injection amount increment according to the first embodiment of the present invention. In FIG. 4, the horizontal axis shows the trim angle, and the vertical axis shows the fuel injection amount increment (%).

Fuel injection amount setting generator 1 in microcomputer 16
8A determines the fuel injection amount based on the engine speed, intake air amount, and crank angle, as in the conventional case. and,
A pulse signal having a pulse width corresponding to the fuel injection amount is supplied to the injector 19 by adding the increment (correction amount) of the fuel injection amount obtained by the following procedure.

At step 30 in FIG. 3, the fuel injection amount setting generator 18A detects the trim angle from the trim angle detector 20. In steps 31 and 32, if the trim angle is not less than A degree (NO), step 33
If the trim angle is less than A degree (YES), the fuel injection amount is increased by a%, and the process returns to step 30.

In steps 33 and 34, if the trim angle is not less than B degrees (NO), the process proceeds to step 35, and if the trim angle is less than B degrees (YES), the fuel injection amount is increased by b%, and step Return to 30.

In steps 35 and 36, if the trim angle is not less than C degrees (NO), the process proceeds to step 37, and if the trim angle is less than C degrees (YES), the fuel injection amount is increased by c%, and step Return to 30.

In step 37, the fuel injection amount is increased by d%.
Increment and return to step 30. FIG. 4 shows this situation in a graph. Note that A<B<C, a<b<c<d
There is a relationship between

Embodiment 1 of the present invention, as described above,
Equipped with a trim angle detector 20 that can detect the trim angle and a fuel injection amount setting generator 18A that can change the fuel injection amount of the outboard engine according to the trim angle, it is possible to monitor the operating state of the boat. Based on this judgment, the fuel injection amount is controlled to achieve the optimum mixture ratio corresponding to the operating state at that time, and it is possible to realize sufficient engine output and stable rotation.

Example 2. In addition, in the above-mentioned Example 1, the fuel injection amount increment was changed stepwise in response to the detected trim angle, but as shown in FIG. 5, the fuel injection amount increment was changed linearly in accordance with the trim angle. You can expect similar behavior.

Example 3. In addition, the above-mentioned Examples 1 and 2
In the above, the fuel injection amount was increased according to the trim angle, but it goes without saying that the desired objective can be achieved even if the fuel injection amount is increased or decreased according to the operating condition.

By the way, in the above explanation, the case where the present invention is used in a 4-stroke engine has been described, but it goes without saying that it can also be used in other types of engines, such as a 2-stroke engine.

[0032]

As described above, the present invention provides trim angle detection means for detecting the trim angle of an outboard engine with respect to the hull, and a fuel injection amount to the outboard engine based on the trim angle. Since the fuel injection amount control means is provided for controlling the fuel injection amount, it is possible to obtain sufficient engine output and stable rotation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is an enlarged view showing the vicinity of a trim angle detector according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the trim angle and the fuel injection amount increment in Example 1 of the present invention.

FIG. 5 is a graph showing the relationship between the trim angle and the fuel injection amount increment in Example 2 of the present invention.

FIG. 6 is a side view showing the entire outboard motor equipped with a conventional internal combustion engine control device.

FIG. 7 is a block diagram showing a conventional internal combustion engine control device.

[Explanation of symbols]

1 Outboard motor 2 Hull 16 Microcomputer 17 Crank angle detector 18A Fuel injection amount setting generator 19 Injector 20 Trim angle detector

Claims (1)

[Claims] 1. Trim angle detection means for detecting a trim angle of an outboard engine with respect to a hull; and fuel injection amount control means for controlling a fuel injection amount to the outboard engine based on the trim angle. An internal combustion engine control device comprising: