JPS5862370A - Ignition control device - Google Patents

Abstract

PURPOSE:To reduce the cost of a device while making it possible to highly precisely control the ignition only with the addition of a multiplying circuit by controlling the ignition by the multiplying signal of the unit angle signal of a crank angle in an ignition timing control device. CONSTITUTION:When a crank angle signal N is supplied to a standard signal generating circuit 11, a standard signal (a) is obtained by detecting the building-up of a crank angle unit angle signal. Further the signal N is supplied to a period measuring circuit 12, and a period corresponding to the unit angle n<0> of the signal N is measured. This information (b) of the number of revolutions is supplied to a lead angle and conduction angle data ROM 13 and a multiplying circuit 14. This ROM 13 supplies a data responding to the value of the information (b) of the number of revolutions to an arithmetic circuit 15, and there an operation is executed, allowing a signal to be provided at the time of conduction initiation and ignition timing. Moreover, the circuit 14 supplies a multiplying signal SIG to an output circuit 16, latches the data of angle information to counters 21, 22, counts down the signal at every time when the signal is supplied and sets a flip flop 23 at a zero counted value, allowing an ignition signal to be issued.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition control device for an internal combustion engine, and more particularly to a device it for controlling ignition timing of an engine.

In an engine that calculates the ignition timing of an engine according to data representing the operating condition of the engine and generates an ignition signal, it is desired to set the ignition timing with high precision. In order to perform highly accurate ignition control, the senna should be configured so that it can generate a crank angle unit angle signal at a finer cycle, and finer ignition timing control can be performed based on this signal. In this case, there is the problem that the mechanical structure of the sensor is complicated, and the senna is expensive.

The present invention has been made in view of the above-mentioned circumstances, and provides an ignition control device that can perform high-precision ignition timing control at a low cost by electronically obtaining a detailed crank angle unit angle signal. This is what we are trying to provide.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of the sensor section (rotation detection section) of the same example, where 1 is a rotating body that is coaxial with the crankshaft of the internal combustion engine and rotates together with the crankshaft, and 2 is a rotating body that extends around this rotating body 10). Magnet parts provided at regular intervals (unit angle na), 31 is a magnet part formed by making a part of these magnet parts 2 continuous, J proverb is a missing part where a part of the above magnet part 2 is missing, 4 is magnet part 2
．． J! A detection unit (pick ara f) detects the passage of the magnetic flux by detecting its magnetic flux, for example, and this detection unit 4
is fixed so as to face a part of the passage of the magnet parts 2 and 31.

In the above sensor, the period of the magnet portion 31 and the missing portion 320 is 1800.6 in the case of a 4-cylinder, 4-cycle internal combustion engine.
By setting the angle to 120° in the case of a cylinder, a crank angle signal N containing two pieces of information, a crank angle reference signal and a crank angle unit angle signal, as shown in FIG. 4, is obtained from the detection unit 4.

That is, when the crank angle signal N is supplied to the reference signal generating circuit 11 as shown in FIG. By detecting the rising edge of the signal, a reference signal a as shown in FIG. 4 can be obtained. Further, the crank angle signal N is supplied to a period measuring circuit 12, and the period corresponding to the unit angle n0 of the crank angle signal N is measured.

This period is the rotational speed information (speed) b of the main body, and this information is read from the AvA (advanced angle) and CDA (conducting angle) data ROM.
DM data ROMJJij: supplies AVA and CDA data according to the value of rotation speed information @b to the arithmetic circuit IIK at the supply timing of the reference signal 1, and also supplies the data to the multiplier circuit 14.
multiplies the frequency of the crank angle unit angle signal and supplies a running multiplied signal BIG to the output circuit 16. The above calculation circuit 11
F! As shown in Fig. 4, the calculation of x0±180°-(ODA+AVA) y@w 180°-AVA is carried out in depth, and when the ignition coil starts energizing, the signal
1 and the ignition timing control signal TRG ffi is increased by 4.

The output circuit 16 outputs the angle information xO, yO to a down counter 11.1, for example, as shown in FIG.
1ifC preset), this down counter z1 counts down every time Δrus SIG is supplied, and resets the 7-lip float 23 at the count value of zero, and the down counter 22 counts down every time Δrus SIG is supplied. , the 7 flip-flop 23 is set when the count value is zero, and the ignition signal C shown in FIG. 4 is output from this flip-flop f23.

The period measuring circuit 12 measures the one cycle time T of the unit angle signal of the crank angle as shown in the fjgs diagram, and the multiplier circuit 14 converts the information obtained in section I in FIG.
As a result of the multiplication, a signal SIG with a period of T1/n is output in section (3). Similarly, by multiplying the information obtained in section (2) by n, a signal having a resolution n times that of signal N in FIG. 5 is generated. In addition, the above-mentioned cycle data is used to detect the engine rotation speed, and CDA (conducting angle) k AVA (advanced angle) data tailored to the engine operating condition is sent to the arithmetic circuit 1 from pre-prepared data RCM13.
5 to generate signals TRG 1 and TRG j, and obtain an ignition signal C in which the rising and falling edges of the signal 5IGK of fine b periods are synchronized. That is, AVA, CDA data R
OM K tri is a counter 2 that has the above-mentioned resolution (2) 7” and can count at fine intervals.
1.22, it becomes possible to control the ignition timing and energization angle (energization time) with a resolution n times that of the crank angle unit angle signal.

! The present invention is not limited to the above embodiments, but can be applied in various ways. For example, in the embodiment, the engine speed is used as a parameter to obtain AvA and CDA, but in addition to this, the pressure inside the engine, the cooling water temperature, the air temperature knock signal, etc. can be used as a parameter to correct the VA and CDA data. This allows for even more precise ignition timing and energization stratum corneum control.

As explained above, according to the present invention, since control is performed using a signal multiplied by the unit angle signal of the crank angle, highly accurate ignition timing control is possible), and electronic circuits such as multiplier circuits are used. Since it can be implemented simply by adding it, it is possible to provide an ignition control device that reduces costs.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings are for explaining one embodiment of the present invention. FIG. 1 is a configuration diagram of a rotation detection section, FIG. 2 is an overall configuration diagram, and FIG. 3 is a diagram of the same configuration. Partially detailed views, FIGS. 4 and 5, are timing waveform diagrams showing the operation of the same configuration. 11...Reference signal generation circuit, 12...Period measurement circuit, 13・AVA, CDA day I ROM, 14
... Multiplier circuit, 15 ... - Arithmetic circuit, 16 ... Output circuit, 21 #22 ... Down counter, 23 ...
flip flop.

Claims (1)

[Claims] In an ignition control device that calculates the ignition timing of the engine according to data that affects the operating condition of the engine and performs ignition control, the device includes a first means for obtaining a unit angle signal of a crank angle, and a number of cycles of the unit angle signal. a second means for obtaining a multiplied signal obtained by multiplying the Fiff value, and a third means for performing ignition control by counting the multiplied signal according to the engine ignition timing calculated by Fiff.
An ignition control device characterized by comprising: means.