JPH0586894A - Rotation phase control device for engine - Google Patents

Abstract

PURPOSE:To control a rotation phase in order to generate an oscillating pulse at specified timing and to reduce generation of oscillation and noise by comparing standard rotation of an engine and the rotation phase with each other and by controlling engine speed of the engine in accordance with this comparison result. CONSTITUTION:A rotation phase control device sends out a standard signal for rotation of an engine 1 by a means A consisting of a standard rotor 2 and a rotation pulse pickup 3. Additionally, by a means B consisting of a same rotor 4 as the above and a same rotation pulse pickup 5 as the above, a rotation phase of the engine 1 is detected. Furthermore, the standard signal and the rotation phase are respectively input to a means C and they are compratively computed. Thereafter, on the basis of the comparison result, engine speed of the engine 1, that is, the fuel injection time and the fuel injection amount of a fuel injection device 6 provided on each cylinder of the engine are controlled by a means D. In this way, the rotation phase of the engine is controlled so that an oscillating pulse is generated at specified timing, and accordingly, generation of oscillation and noise is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine rotational phase control device capable of synchronizing an engine rotational phase with a periodically generated reference signal.

[0002]

2. Description of the Related Art An internal combustion engine, especially a reciprocating engine, converts a linear motion of a piston into a rotary motion of a crankshaft. Therefore, a force due to unbalanced inertia of the piston, the crankshaft, etc. acts on each cylinder, and this force causes vibration. Occur.

[0003]

By the way, when the pulse generation timing of the engine vibration is unknown and there is another vibration source, the engine and the vibrations of the vibration source other than the engine interfere with each other. Large vibrations and noises may be generated by matching or combining. For example, in an outboard motor equipped with two left and right engines, vibrations of the left and right engines are combined to generate large vibration and noise, and a beat noise is generated due to a slight deviation between the left and right engine speeds. I have something to do.

The present invention has been made in view of the above problems. An object of the present invention is to provide an engine rotational phase control device capable of controlling an engine rotational phase so as to generate a vibration pulse at a predetermined timing. To provide.

[0005]

To achieve the above object, the present invention comprises a reference signal generating means for engine rotation, a phase detecting means for detecting an engine rotation phase, and a reference signal generating means and a phase detecting means. It is characterized in that the engine rotation phase control device is configured to include a comparison calculation means for the output signal and a rotation control means for controlling the rotation speed of the engine based on the output of the comparison calculation means.

[0006]

According to the present invention, the rotation phase of the engine can be synchronized with the reference signal (reference rotation phase) periodically generated by the reference signal generation means by the comparison calculation means and the rotation control means. The generation timing of the vibration pulse of the engine can be arbitrarily controlled by changing the reference signal output from the generation means. As a result, engine vibrations and vibrations from other vibration sources can be canceled out. For example, even in an outboard motor equipped with two left and right engines, the vibrations of the left and right engines are canceled out.
Noise can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a rotary phase control device according to the present invention. The rotary phase control device includes reference signal generating means A for generating a reference signal for the rotation of a V-type multi-cylinder engine 1. The phase detection means B for detecting the rotation phase of the engine 1, the comparison calculation means C for the signals output from the reference signal generation means A and the phase detection means B, and the rotation of the engine 1 based on the output of the comparison calculation means C. The rotation control means D for controlling the speed (phase) is included.

By the way, the reference signal generating means A is a disk-shaped reference rotary member 2 which is rotationally driven at a constant speed by a drive source (not shown), and a reflection mark provided on the outer peripheral portion of the reference rotary member 2. m and a rotary pulse pickup 3 for detecting a plurality of slits that transmit light, and the rotary pulse pickup 3 is connected to the comparison calculation means C.

The phase detecting means B is composed of a rotating body 4 similar to the reference rotating body 2 and a rotating pulse pickup 5 similar to the rotating pulse pickup 3, which are connected to the crankshaft of the engine 1. The rotary pulse pickup 5 is connected to the comparison calculation means C.

Further, in this embodiment, the rotation control means D
Is a fuel injection control device that adjusts the fuel injection timing and the fuel injection amount by the fuel injection device 6 provided in each cylinder of the engine 1.

Thus, in this embodiment, the reference rotation pulse (phase) of the reference rotating body 2 in the reference signal generating means A is detected by the rotation pulse pickup 3 and input to the comparison calculating means C. Similarly, the rotation pulse (phase) of the engine 1 is detected by the rotation pulse pickup 5 of the phase detection means B and input to the comparison calculation means C.

The comparison calculation means C compares the rotation pulse (phase) input from the reference signal generation means A and the phase detection means B, and the rotation phase of the engine 1 is the reference rotation body 2.
The control amount (fuel injection timing and fuel injection amount) required to synchronize with the rotation phase of is calculated, and a signal corresponding to this control amount is output to the rotation control means D. Then, the rotation control means D outputs a control signal corresponding to the signal input from the comparison calculation means C to each fuel injection device 6, and adjusts the fuel injection timing and the fuel injection amount by each fuel injection device 6. Control the rotational speed (phase) of the engine 1. As a result, the rotational phase of the engine 1 is synchronized with the rotational phase of the rotating body 2, and the rotational speed (phase) of the reference rotating body 2 of the reference signal generating means A is changed to arbitrarily generate the vibration pulse of the engine 1. When there is a vibration source other than the engine 1, it is possible to cancel the vibration of the engine 1 and the vibration of another vibration source, thereby reducing vibration and noise.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be explained based on. 2 is a block diagram of the rotary phase control device according to the second embodiment, and FIG. 3 is a flowchart showing the rotary phase control method.

In this embodiment, the device of the present invention is applied to an outboard motor equipped with two left and right engines 1L and 1R. In the rotational phase control device according to this embodiment, one (right) The engine 1R and the crank angle sensor 7R constitute the reference signal generating means A, and the other (left) engine 1L
The crank angle sensor 7L provided on the side is the phase detecting means B.
And a bypass air valve 9 provided on the intake side of the left engine 1L and an ignition timing control unit (ECU) 10L, 1 provided on each engine 1L, 1R.
0R constitutes the rotation control means D. In this embodiment also, the comparison calculation means C is provided, but the comparison calculation means C is commonly integrated with the ignition timing control unit 10L of the left engine 1L. Also, each engine 1
L and 1R are provided with throttle sensors 11L and 11R for detecting the opening of the throttle valves 8L and 8R. These throttle sensors 11L and 11R are ignition timing control unit 10L, comparison calculation means C, and ignition timing. Each is connected to the control unit 10R.

Further, each of the left and right engines 1L and 1R is provided with an ignition device including an ignition plug 12, an ignition coil 13 and a pulsar coil 14.

On the other hand, the operation panel 15 in the cockpit is provided with a synchro switch 16 and a reset switch 17, which are connected to the comparison calculation means C.

The operation of the present rotary phase controller will be described below with reference to the flow chart shown in FIG.

In this embodiment, the synchro switch 16 provided on the operation panel 15 in the cockpit is turned on.
Only when the rotation phase control device is operated, the rotation phase control device is operated, and the operation of the rotation phase control device is released by turning on the reset switch 17.

When the synchro switch 16 is turned on, the rotation phase control device operates, and the reference rotation phase αR of the right engine 1R in the reference signal generating means A is detected by the crank angle sensor 7R and the ignition timing is set. It is input to the comparison calculation means C via the control unit 10R. Similarly, the rotational phase αL of the left engine 1 is detected by the crank angle sensor 7L and input to the comparison calculation means C.

In the comparison calculation means C, the rotational phase αR input from the reference signal generation means A and the phase detection means B,
When αL is compared (step 1 in FIG. 3), and as a result of the comparison, for example, the phase αR of the right engine 1R is larger than the phase αL of the left engine 1L (αR> αL), both phases αR,
The degree of deviation of αL is determined (step 2). Then, depending on the degree of deviation between the phases αR and αL, the air supply amount of the left engine 1L is increased by the control of the bypass air valve 9 (step 3), or the ignition timing of the left engine 1L is being retarded. If the ignition timing control unit 10L is retarding the ignition timing control unit 10L, the ignition timing control unit 10L advances the ignition timing of the left engine 1L (step 5). The ignition timing of the engine 1R is retarded (step 6), and in the above processing, the phases αR and αL match (αR
= ΑL). Here, that the phases αR and αL match (αR = αL) means that the left and right engines 1L, 1
When the rotation directions of R are opposite to each other, it means that the top dead centers are made to coincide with each other, and when the rotation directions of the left and right engines 1L and 1R are the same, the crank angles are set to 1 with respect to each other.
It means to shift by 80 °.

As a result of the above, the vibrations of the left and right engines 1L and 1R can be canceled out, and the vibration of the hull can be reduced. Further, it is possible to prevent the generation of a beat noise due to a slight deviation of the rotational speeds of the left and right engines 1L and 1R, and to reduce noise. The left engine 1 is shown in FIG.
A case where the phase αL of L is larger than the phase αR of the right engine 1R (αL> αR) is not shown, but in this case as well, both phases are αL and αR by the same processing as described above.
Are matched (synchronized).

[0023]

As is apparent from the above description, according to the present invention, the reference signal generating means for the engine rotation, the phase detecting means for detecting the rotation phase of the engine, and the reference signal generating means and the phase detecting means. Since the engine rotation phase control device is configured to include the comparison calculation means of the output signal and the rotation control means for controlling the rotation speed of the engine based on the output of the comparison calculation means, the vibration pulse is generated at a predetermined timing. It is possible to obtain the effect that the rotational phase of the engine can be controlled so that

[Brief description of drawings]

FIG. 1 is a configuration diagram of a rotation phase control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a rotation phase control device according to a second embodiment of the present invention.

FIG. 3 is a flow chart showing the operation of the rotation phase control device according to the second embodiment of the present invention.

[Explanation of symbols]

 A reference signal generation means B phase detection means C comparison calculation means D rotation control means

Claims (1)

[Claims] 1. A reference signal generating means for engine rotation, a phase detecting means for detecting a rotation phase of an engine, a comparison calculating means for signals output from the reference signal generating means and the phase detecting means, and the comparison calculating means. A rotation phase control device for an engine, comprising a rotation control means for controlling the rotation speed of the engine based on the output of the engine.