JPS6211184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-contact ignition device used in a two-wheeled vehicle engine, and more particularly to an ignition advance control device for obtaining advance characteristics optimal for engine conditions.

This type of non-contact ignition device, as shown in FIG. The first triangular wave voltage _X1 for setting the advance angle rises at a predetermined slope angle from the minimum advance position A to the maximum advance position B, as shown in FIG. A second triangular wave voltage Y corresponding to the rotational speed that is flat up to corner position A is created, and these first and second triangular wave voltages X ₁ and Y are combined as shown in FIG. It has been proposed that by determining the intersection point, that is, the ignition position R, the advance angle characteristic as shown in the polygonal line _P1 in Fig. 2 can be obtained (for example, in JP-A-55
-Refer to Publication No. 5406).

However, in such a non-contact ignition device,
If an attempt is made to obtain the maximum torque by placing the advance angle characteristic line P ₁ within the maximum torque zone S, the vicinity of the bending point of the advance angle characteristic line P ₁ will fall within the knocking zone U. Therefore, in order to obtain maximum torque and prevent knocking, as shown in Figure 3,
It is necessary to create an advance angle characteristic line _P2 that bends at each point E, F, and G and avoids the knocking zone U.

The present invention has been made in view of this point, and its purpose is to provide an inexpensive non-contact ignition device for an engine that can obtain the advance angle characteristics shown in FIG. 3 with a simple circuit configuration. It is in.

In order to achieve this object, the present invention applies a first triangular wave voltage for setting the advance angle to a triangular wave voltage at least once between starting integration from the maximum advance position and then ending the integration at the minimum advance position. It is created by changing the slope angle of the voltage and adding a constant voltage to it, and the integration of the second triangular wave voltage corresponding to the rotation speed is started from the minimum advance position and at the maximum advance position. It is characterized in that it is created by terminating the integration and holding the value up to the minimum advance angle position.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 4 is a block diagram of an ignition advance angle control device according to an embodiment of the present invention. In this figure, a rotor 1 is directly connected to a crankshaft of an engine, and a protrusion 2 having an angle of advance width A-B is provided on the outer periphery of the rotor. Reference numeral 3 denotes a pulser which generates a positive signal at the minimum advance angle position A and a negative signal at the maximum advance angle position B by the protrusion 2 of the rotor 1. 4 is pulsa 3
The flip-flop operates according to the signal _Q1 , which rises at the maximum advance position B and falls at the minimum advance position A. 5 is a monostable multivibrator circuit, and when the maximum advance position signal is generated,
That is, the T ₀ signal Q ₂ is output for a certain period of time from the rising edge of the output signal Q ₁ of the flip-flop 4.
Reference numerals 6 and 7 designate first and second triangular wave voltage generation circuits, each of which uses an integrating circuit that charges a capacitor with a constant voltage, as will be described later. 8 applies a constant advance angle setting bias voltage V ₁ to the output of the first triangular wave voltage generation circuit 6 using a voltage dividing resistor, etc.
The output of the first triangular wave voltage generation circuit 6 to which this lead angle setting bias voltage _V1 is applied, that is, the first triangular wave voltage _X2 , and the output of the second triangular wave voltage generation circuit 7, that is, the second triangular wave This is a comparison circuit that compares the voltage Y and determines the ignition position R.

FIG. 5 shows a specific example of the first triangular wave voltage generating circuit 6 shown in FIG. In this figure, T _r is a transistor, C is a capacitor, D is a diode, and R ₁ to _{R 4} are resistors. The transistor T _r constitutes a constant current source, and the capacitor C is charged with a constant current to create a triangular wave voltage. At this time, when the signal ₁ is generated, the transistor T _r becomes conductive and starts charging the capacitor _{C, and the triangular wave voltage is raised at a predetermined slope angle, but when the signal 2 disappears} after a predetermined time T , since the base potential of the transistor T _r changes, the triangular wave voltage starts to rise at a smaller slope angle than before, making it possible to obtain a triangular wave voltage with a breaking point.

6 is an operational waveform diagram of the ignition advance angle control device shown in FIG. 4, and FIG. 7 is an enlarged explanatory diagram of FIG. 6. The operation of this embodiment will be explained with reference to these diagrams.

The rotation of the protrusion 2 of the rotor 1 causes the pulser 3 to generate pulses that serve as reference signals at the signal generation positions shown in FIGS. 1 and 2, that is, the maximum advance angle position B and the minimum advance angle position A. The flip-flop 4 operates to generate a signal _Q1 as shown in FIG. 6, which rises at the maximum advance position B and falls at the minimum advance position A. The output signal _Q1 of the flip-flop 4 is input to a monostable multivibrator circuit 5, first and second triangular wave voltage generation circuits 6 and 7, and a comparison circuit 8, respectively. In the monostable multivibrator circuit 5, a signal _Q2 is generated which rises at the rising edge of the signal _Q1 and falls after a predetermined time _T0 , as shown in FIG.
This is input to the first triangular wave voltage generation circuit 6.
The first triangular wave voltage generation circuit 6 starts integration at the rising edge of the signal Q ₁ and raises the voltage at an inclination angle β, and after a predetermined time T ₀ when the signal Q ₂ falls, the charging current changes and The voltage is raised at a slope angle τ different from τ, and the integration is continued until the falling point of the signal Q ₁ to generate a two-stage triangular wave voltage X ₀ as shown in Figure 6.5, and compare this. circuit 8
Enter. On the other hand, the second triangular wave voltage generation circuit 7
Then, we start integration from the falling point of signal Q ₁ , and keep the slope angle α until the next rising point of signal Q ₁ .
The voltage is raised at , and thereafter this value is held until the fall of the signal Q ₁ to generate a second triangular wave voltage Y as shown in FIG. In addition, in the comparator circuit 8, as _shown in _FIG .
The first triangular wave voltage _X2 is compared with the second triangular wave voltage Y, and when these waveforms match _, an ignition signal is output and the ignition position R is determined.

As shown in Fig. 7, between A and A, that is, one revolution is T, between A and B is K ₁ T, and between B and A, that is, the maximum advance width is K ₂ T. Assuming that the advance time from R to the pre-advance reference ignition position, that is, the minimum ignition position A, is tθ, and the maximum value of the second triangular wave voltage Y is V ₂ , V ₂ = K ₁ Ttanα V ₂ = V ₁ +T ₀ tanβ+(K ₂ T−tθ−T ₀ )tanγ K ₁ Ttanα=V ₁ +T ₀ tanβ+(K ₂ T−tθ−
T ₀ ) tanγ tθ=(K ₂ T−K ₁ Ttanα/tanγ)+{V ₁ /
tanγ+T ₀ (tanβ/tanγ−1)}, and converting this to advance angle θ, θ=360°×tθ/T T=60/N (N is rotational speed [rpm]), so N≦ When 60K ₁ tanα/V ₁ +T ₀ tanβ, θ=360°×(K ₂ −K ₁ tanα/tanγ)+{V ₁ /
tanγ+T ₀ (tanβ/tanγ −1)}60N, and when N≧60K ₁ tanα/V ₁ +T ₀ tanβ, θ=360°×(K ₂ −K ₁ tanα/tanβ)+
V ₁ /tanβ60N.

As described above, according to this embodiment, the rate of change dθ/dN of the advance angle with respect to the rotation speed changes from a certain rotation speed, and the target advance angle characteristics as shown in FIG. 3 can be obtained.

Further, FIG. 8 shows another specific example of the first triangular wave voltage generating circuit. The difference from the specific example in Figure 5 is that the monostable multivibrator circuit 5
is omitted, and instead, the comparator 9 compares the output voltage, that is, the triangular wave voltage X ₀ , with _the reference voltage level given by voltage dividing resistors R ₅ and R ₆ ,
When T reaches the reference voltage level, the transistor T
The point is that by changing the base potential of _r , the triangular wave voltage X ₀ is raised at a slope angle γ different from the previous slope angle β.

In the above embodiment, the first triangular wave voltage has one bending point, but a plurality of detectors for detecting a plurality of different predetermined times from the maximum advance angle position B are provided to detect each predetermined time. By changing the base potential of the transistor T _r at each point in time, the first triangular wave voltage can have a plurality of bending points, and better advance angle characteristics can be obtained.

As described above, according to the present invention, maximum torque can be obtained with a simple circuit configuration, and excellent advance angle characteristics that do not cause knocking can be obtained.

[Brief explanation of the drawing]

1 to 3 are diagrams explaining the operating principle of the electronic advance angle, FIG. 2 is a diagram of the advance angle characteristic obtained by the first operating principle, and FIG. 3 is an example of the advance angle characteristic required by the present invention. 4 is a block diagram of an ignition advance control device according to an embodiment of the present invention, and FIG. 5 is a wiring diagram showing a specific example of the first triangular wave voltage generation circuit shown in FIG. 4. , FIGS. 6 1 to 7 are operational waveform diagrams of the embodiment shown in FIG. 4, and FIG. 7 is an enlarged explanatory diagram of FIG. 6 and 7.
FIG. 8 is a wiring diagram showing another specific example of the first triangular wave voltage generating circuit. 1... Rotor, 3... Pulser, 4... Flip-flop, 5... Monostable multivibrator circuit, 6... First triangular wave voltage generating circuit, 7... Second triangular wave voltage generating circuit, 8... Comparison circuit, x ₂
...First triangular wave voltage, Y...Second triangular wave voltage.

Claims (1)

[Claims] 1. The first lead angle setting rises vertically from the maximum lead angle position by the amount of lead angle setting bias voltage, and from there rises at a predetermined inclination angle to the minimum lead angle position.
means for generating a triangular wave voltage, and a second triangular wave voltage corresponding to the rotational speed that rises at a predetermined slope from the minimum advance angle position to the maximum advance angle position, and becomes flat after the maximum advance angle position. and means for determining the intersection point of the first triangular wave voltage and the second triangular wave voltage, the contactless ignition device for an engine having this intersection point as the ignition position, wherein the first triangular wave voltage generating means has a maximum Consisting of a circuit that starts integration from the advance angle position and then changes the slope angle of the triangular wave voltage at least once between the time and the minimum advance angle position where the integration ends, and applies a constant voltage to this,
For an engine, the second triangular wave voltage generating means is comprised of a circuit that starts integration from the minimum advance angle position, ends the integration at the maximum advance angle position, and holds the value up to the minimum advance angle position. Non-contact ignition device.