JPH076489B2 - Internal combustion engine ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an ignited internal combustion engine ignition device such as a multi-cylinder V-type engine.

[Conventional technology]

FIG. 1 is a block diagram of an internal combustion engine ignition device previously filed by the same applicant (Japanese Patent Application No. 62-142703). In the figure, reference numeral 1 is a signal rotor, and trigger poles 2a and 2b corresponding to each cylinder are provided on the outer periphery thereof. In addition, this embodiment shows the case of a two-cylinder 90 ° V-type engine. The angles of the trigger poles 2a and 2b are θ ₁ and θ ₃ , and the angle between the trigger poles 2a and 2b is θ _2. If
The relationship between θ ₁ , θ ₂ and θ ₃ is θ ₁ + θ ₂ = θ ₂ + θ ₃ = 90
And θ ₁ = θ ₃ ≈θ ₂ . A signal coil 3 is provided so as to be close to the signal rotor 1 and the trigger poles 2a and 2b at the time of rotation, and its output is connected via a waveform shaping circuit 4 to a microcomputer 5 which is an ignition control device. The microcomputer 5 includes an input port 6, an input timer 7, an output timer 8, a CPU 9, a RAM 10, a ROM 11 and an output port 12, and the output of the waveform shaping circuit 4 is connected to the input port 6 and the output port 12 Is the amplifier circuit 13
It is connected to a and 13b. 14a and 14b are ignition coils whose primary coils are connected to amplifier circuits 13a and 13b, respectively. The secondary coil of the ignition coil 14a has a 1-cylinder ignition plug 15a.
However, a spark plug 15b for two cylinders is connected to the secondary coil of the ignition coil 14b.

Next, the operation of the internal combustion engine ignition device having the above configuration will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG.

When the signal rotor 1 rotates in synchronization with the rotation of the engine,
Positive and negative angle signals are generated in the signal coil 3 as shown in FIG. The waveforms in FIGS. 4 (A) to 4 (F) are the waveforms at points A to F in FIG. Signal coil 3
The waveform of the angle signal output from the waveform shaping circuit 4 is shaped by the waveform shaping circuit 4 (FIG. 4 (B)) and input to the microcomputer 5.

The microcomputer 5 obtains the period tan, tbn (n = 1,2,3, ... n-1, n, n + 1, ...) Of this signal in step S1, and halves tbn and tan in step S2. Compare the size with. That is, in the period between the trigger poles 12a and 12b, a pair of the signal interval from the advance side to the initial side and the interval from the signal on the initial side to the signal on the advance side of the next trigger pole are compared. . When 1 / 2tbn> tan in step S2, the process proceeds to step S3, the predetermined ignition timing calculation for the one cylinder side is performed, and the output ignition timing control signal (FIG. 4 (C)) is output to the amplifier circuit 13a. Is supplied to the ignition coil 14a via the ignition coil 14a, and the ignition coil 14a is energized as shown in FIG. 4 (E). Alternatively, if 1 / 2tbn≤tan in step S2, the process proceeds to step S4, and the microcomputer 5 similarly calculates the ignition timing of the two-cylinder side. The output signal (FIG. 4 (D)) is sent to the ignition coil 14b via the amplifier circuit 13a.
And the ignition coil 14b is energized as shown in FIG. 4 (F), a high voltage is generated in the secondary coil when the current is cut off, and the spark plug 15b discharges sparks.

[Problems to be Solved by the Invention]

The internal combustion engine ignition device configured in this way has achieved great results such as the signal distribution of a plurality of cylinders with only one signal coil. However, when the engine speed fluctuation is large, for example, at engine startup, etc. There is a risk that misfiring will occur, and if such misfiring occurs, there will be problems such as the occurrence of ketchin and, in extreme cases, damage to the engine, and these problems remain unsolved. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal combustion engine ignition device capable of preventing erroneous ignition even when the engine speed fluctuation is large.

[Means for Solving the Problem] In an internal combustion engine ignition device according to the present invention, a cylinder discrimination is performed by comparing signal intervals between a plurality of trigger poles provided at unequal intervals in a non-uniform engine. It is the one.

[Work]

In the present invention, since the signal intervals between the plurality of trigger poles provided at unequal intervals are compared in the present invention, the angle ratio between the signals is large, and therefore the tolerance for the engine speed fluctuation for cylinder discrimination is accepted. The cylinder is accurately determined even if a large fluctuation in the number of revolutions occurs.

〔Example〕

An internal combustion engine ignition device according to an embodiment of the present invention will be described below with reference to the drawings. Since the configuration on the drawing in the embodiment is the same as that in FIG. 1, its description is omitted here.

FIG. 2 is a flowchart showing the operation of the microcomputer 5 in the internal combustion engine ignition device. First, in step S11, the period tbn (n = 1, 1) of the signal shown in FIG.
2,3, ... n, n + 1, ...), and then in step S12, tbn and tbn
_-Compare with _-1 . That is, this is to compare the high-level parts of the waveform shown in FIG. 4 (B), and also the interval between the trigger poles 2a and 2b, θ ₂ and 360 °-(θ
₁ + θ ₂ + θ ₃ ). Therefore, since the angle ratio between the signals to be compared is large (about 5 times in the embodiment) and the tolerance for the rotational speed fluctuation is high, accurate cylinder discrimination is performed even if a large rotational speed fluctuation occurs. If tbn> tbn ₋₁ in step S12, the process for one cylinder is performed in step S13, that is, the amplification circuit 13a.
If tbn ≦ tbn ₋₁ is satisfied, the ignition control signal is sent to the two-cylinder side processing, that is, the amplifier circuit 13b in step S14.

In the above embodiment, the trigger poles 2a and 2b are non-uniformly distributed engines in which the signal rotor 1 is unevenly formed.
Although the V-type engine has been described as an example, the present invention is not limited to this, and a non-uniformly distributed engine having a plurality of cylinders has the same effect as that of the above embodiment.

〔The invention's effect〕

As described above, according to the present invention,
Cylinder discrimination is performed by comparing signal intervals between a plurality of trigger poles provided at unequal intervals, so cylinder discrimination can be performed even when the engine speed suddenly changes, such as when the engine starts. Accurate operation can be performed to prevent erroneous ignition, and it is possible to prevent the occurrence of ketching, and thus damage to the engine.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an internal combustion engine ignition device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation procedure of cylinder discrimination of an internal combustion engine ignition device according to an embodiment of the present invention, FIG. FIG. 4 is a flow chart showing the cylinder discrimination operation of the conventional internal combustion engine ignition device, and FIG. 4 is an operation waveform diagram of each part of the internal combustion engine ignition device according to the present invention and the prior art. 1 ... Signal rotor, 2a, 2b ... Trigger pole, 3 ...
… Signal coil, 5… Microcomputer.

Claims (1)

[Claims] 1. A signal rotor that rotates in synchronization with the rotation of an internal combustion engine, and a plurality of trigger poles provided on the outer periphery of the signal rotor at unequal intervals corresponding to the advance reference position and the initial position of each cylinder. A single signal coil for generating an angle signal corresponding to the angle of the trigger pole, and a cycle calculating means for measuring a cycle from the initial position to the advance angle reference position based on the angle signal from the signal coil. A cylinder discriminating means for discriminating the cylinder of the internal combustion engine by comparing the previous cycle with the current cycle.
An internal combustion engine ignition device comprising: an ignition control unit that performs an ignition process of the cylinder determined by the cylinder determination unit.