JPS582665A - Revolutions detector for internal combustion engine - Google Patents

Abstract

PURPOSE:To achieve an accurate detection of revolutions regardless of whether a DC-DC converter is operating or not by checking the revolutions based on current flowing through a wake circuit having a secondary winding of an ignition coil and the converter. CONSTITUTION:An impedance Z for detecting a discharge current is connected in series to the ground side of a DC-DC converter 6 which spplies an additional current in series to a secondary winding 12 of an ignition coil 1 overlapping the discharge current. A voltage waveform across the impedance Z is shaped in the form with a waveform shaping circuit F and applied to a revolutions detection module 9 as a similar waveform for detecting a discharge current regardless of the use of the converter 6. This enables accurate detection of revolutions whether the DC-DC converter operates or not. The result is also the same when the output of the circuit F is applied to the module 9 overlapping the terminal voltage on the primary side of the coil 1.

Description

Detailed Description of the Invention: Regarding the v4 Hirouchi Ariko/Jin Oa rotation number detection scissor installation, the inner case has a 9-ignition twine with an auxiliary power supply connected in series to the secondary winding of a 4-terminal ignition coil. Engine gm @ number detection device ll.

Figure 1 shows the approximate amount of silver for a conventional 01 auxiliary power source and nine ignition coils.

11K>, 1 is an ignition coil having a primary winding 11 and a secondary winding 12, 3 is a rotary magnet 21 that rotates in synchronization with one turn of the internal combustion engine, and 9 is a pickup coil 22 electromagnetically coupled thereto. It's a good sensor.

Reference numeral 3 denotes a semiconductor ignition island which is controlled by the output of the sensor 2 and cuts off and on the current flowing through the primary winding 11 of the ignition coil 1 in synchronization with the rotation of the internal engine. Since the semiconductor ignition module is currently widely used and is not an essential part of the present invention, a detailed explanation of its internal structure will be omitted.

4 is a main switch inserted in series between the primary winding 11 of the ignition coil 1 and the battery 5;

A DC-DC converter 6 is energized by the battery sK when the main switch 4 is closed, and generates a high-voltage DC voltage. As for the DC-DC converter 6,
Any one can be used.

7 is the distributor, ramie is the discharge gap, and 9 is the rotation speed detection module. In addition, the rotation speed detection module 94, which is currently widely used, is one that can be used by using IT.
, since it is not an important part of the present invention, a detailed explanation of its internal structure will be omitted.

As is clear from the figure, the DC output of the DC-DC converter 6 is connected in series with the secondary coil 12 of the ignition coil 1, and when a spark discharge occurs in the discharge gap 8, an additional charge is superimposed on the discharge current. The current is supplied, thereby reinforcing the spark discharge and making the operation of the internal combustion engine more reliable.

The rotation speed detection module 9 is a secondary winding 11 of the ignition coil 1.
11KII detects the intermittent current, and based on this,
Detects the g-rolling speed of an internal combustion engine. The 1* and n rotation numbers detected in this manner are used for controlling the fuel supply amount of the internal combustion engine and other controls.

In this case, an ignition system that does not have a DC-DC converter 6 as an auxiliary power supply or a DC-DC converter as shown in Fig.
The waveform of the voltage E input to the loop 9 is as shown in diagram 1s2. The rotational speed detection module 9 detects the peak pulse island of the second m voltage waveform at the beginning of discharge, thereby detecting the rotational speed.

On the other hand, when the first l0DC-DC=r engine A-p6 is operated, the waveform of the voltage E input to the rotational speed detection gear 9 becomes as shown in **. It is clear that this waveform is made softer than the waveform in Figure 2, and the peak of the pulse at the beginning of the discharge has become dull and less noticeable11. As a result of this, the rotation speed 6 detection operation due to the rotation □ number detection module 9 is unstable.
, there is a tendency to include the output rotational speed signal KM. f9, when the input voltage wave y# between operating and non-operating DC-DC converters is large @ KJ%, - There is a drawback that the accuracy of rotation speed detection is reduced, and during the fuel supply amount control performed based on this, no proper control is performed.

The present invention eliminates the above-mentioned drawbacks and
An object of the present invention is to provide a one-turn detection device for an internal combustion engine that can accurately detect the rotation speed regardless of whether the converter is in operation or not.

In order to achieve the above object, the present invention provides an ignition-
The current flowing through the DC output side of the DC-DC converter and the O series circuit, and the current flowing through the DC output side of the DC-DC converter and the O series circuit, are removed, the differential waveform is frozen, and the current is supplied to the DC*WA rotation detection module. , are configured to be superimposed on the primary terminal voltage of the ignition coil and supplied to the rotation speed detection module.

Figure 4 shows the main departure! 101 According to the diagram showing the block diagram of the first embodiment, lsl! ! The same sign as I means the same or equivalent part.

2 is the DC high voltage output IIl of the DC-DC converter 6
This is a series impedance (resistance in the illustrated example) for detecting discharge current connected in series to the ground terminal, II ground, and O terminal. F
is inserted in series between the current output impedance 2 and the rotation number detection module 9 and 0, and is the first one to form the electric current EflK This is a waveform rectification circuit (for example, - branch path, etc.).

Figure 3 shows a specific example of the wave y/I shaping path F.

6 and 17 show the input waveform and output waveform of the waveform shaping circuit F when the switch of the pot circuit element is selected as shown in Table 1.

1st Table 2... 270g Island, R1...2200ρ Pull...240kj C8...0.22μI C3...0.001μν C1...0.01μm Dl...IN914 Q□...・2SC372 Figure 6 is a waveform diagram when the DC-DC converter 6 is not operated, and Figure 7 is a waveform diagram when the converter 6 is operated. (ii) voltage - that is, the input voltage waveform of the waveform shaping circuit; (ii) is the output voltage waveform of the waveform shaping circuit F;

As is clear from the comparison between FIG. 6 and FIG. 7, according to the present invention, the output waveform of the single-waveform shaping circuit F is independent of whether the DC-DC converter is operating or not.
The input waveforms of the rotation speed detection module 90 are equal.

Therefore, the output of the a plate number detection module 9 (i.e.,
The rotational speed (I odd) will no longer fluctuate due to the operation/non-operation of the DC-DC converter 6, and various controls performed based on this will no longer be inappropriate.

FIG. 8 shows a block diagram of a pseudo-embodiment of the invention. In this figure, the same reference numerals as in Figure 4 represent the same parts. T is a transformer and D is a diode.

In this embodiment, the discharge current flowing into the series circuit of the secondary winding 12 of the ignition coil 1 and the auxiliary voltage II (DC-DC converter) is taken out from the secondary side of the generator T□, and the diode D to the ignition coil IG-next winding 11! After superimposing the voltage voltage on the pulse, the rotation speed detection layer breather 9
We are trying to supply it to

The diode D serves to prevent the voltage pulse generated in the primary winding 11 of the ignition coil L from flowing back to the transformer T. 9. A waveform shaping circuit F may be inserted between the transformer T and the diode D, as shown by the dotted line.

As is clear, according to the embodiment of FIG. 8, an auxiliary power source can be added very easily to a conventional ignited silver quantity without an auxiliary power source, without causing problems in detecting the number of turns. It's self-explanatory.

In addition, in each embodiment of the present invention, the impedance 2 for detecting discharge current and the transformer 2 can be replaced with each other, and the fact that a differential transformer or the like 4 can be used in place of these components is a matter of concern to pests. % will be done.

The main part of an example in which the current detection impedance in FIG. 4 is replaced with a current transformer is shown in No. 1011. In the same figure, T1
is the current transformer and r is its load resistance. It is also possible to omit FIG. 4 and FIG. 10110111.

Furthermore, according to the present invention, the impedance, transformer, differential transformer, etc. for discharge current detection inserted between the output terminal of the DC-DC converter 6 and the ground, the transformer, the differential transformer, etc. Since the value of can be selected to be several hundred ohms or less, the loss of ignition energy can be virtually ignored by inserting these in series.

However, as mentioned above, the DC-DC converter used in the present invention may be any O4 converter, an example of which is shown in FIG.

In FIG. K), IC, to IC4 are integrated circuit blocks. As each one-way element, those shown in Table 2 can be used.

JI 2 Table IC, -780! I (Voltage L/Gilep) IC,
... SSS (Tie IC as an oscillator, ...
7410? (Zurig 70 tube or frequency divider) IC, -7
! ! 451 (driver with gate circuit) Qs bQ*s
'= 2802334Q*m, Q** ”・2BC
114G

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a conventional internal combustion engine t) if rotation speed detection device, 11 and 311 are rounded waveform diagrams explaining the operation of the device in FIG. 1, and FIG. Block diagram of the embodiment, No. 511 is a book! IN used for R light
6 and 7 are waveform diagrams for explaining the operation of the 11411 embodiment, and FIG. 8 is a block diagram of another embodiment of the present invention.
1 is a book diagram of a C-DC converter suitable for use in the W14 of the present invention, and FIG. 10 is a block diagram of a main part of a further embodiment of the present invention.・Sensor, 3... Semiconductor ignition module, 6... DC-DC converter, 7.
...Distributor, 8...Discharge gap, 9.
...Rotation speed detection module, 11...-Next volume, 12
...Secondary winding, 2...Impedance, F...Wave type simple path, T...Transformer agent Michihito Hiraki, patent attorney and 1 other person, 3 years old, E-ro, 0 years old figure

Claims (2)

[Claims] (1) a 41a secondary mIO ignition coil having a primary winding through which the current flows in synchronism with the inner engine shroud and a secondary winding connected to the ignition discharge gap; A nine-channel #lII auxiliary power supply connected in series with the secondary winding, a discharge current detection means further connected in series with the secondary winding and the DC auxiliary power supply, and an output signal of the discharge current detection means is supplied. 1. A rotation speed detection device for internal combustion carrots, comprising a rotation speed detection means. (2) Discharge current detection means for detecting failure and change of appearance,
Further, a waveform shaping circuit is inserted, and a one-transition detection device of an internal combustion engine according to claim 1 is further inserted. Intermittent primary winding and discharge gap El after ignition
a four-terminal ignition coil having one continuous and one secondary winding;
nine DC auxiliary power supplies connected in series with the secondary winding; discharge current detection means further connected in series with the secondary winding and the DC auxiliary power supply; voltage and discharge current detector R of the secondary winding; 9. A rotational speed detection method for an internal engine, comprising: a signal superimposing means for superimposing the output of the signal superimposing means; and a rotational speed detecting means supplied with the output of the signal superimposing means.