JPH01125562A - Controller for engine - Google Patents

Abstract

PURPOSE:To reduce the exothermic reaction of each resistor and make the whole controller compact by supplying current to each resistor connected to each power transistor base for a plurality of ignition coils in an electronic wiring circuit only in ignition for its own cylinder. CONSTITUTION:The reference position signal 1a, crank angle signal 2a and new charge amount signal of each cylinder detected respectively by detecting devices 1, 2, 8 are input in CPU 4 respectively through input/output device 3 to calculate the ignition timing and current supply time of an ignition coil 7. The calculating result of CPU 4 provides an ignition signal 3a which is output from said device 3 through an electronic wiring circuit 6 to the ignition coil 7. Then, the respective signals 1a, 2a are input also in a reference cylinder judging circuit 5, while the reference signal 5a is also output to said circuit 6. Each resistor connected to the power transistor base of ignition coil 7 receives current only in the ignition in its own cylinder, so that the exothermic reaction of each resistor is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine control device equipped with an electronic power distribution circuit for one cylinder and one ignition coil, and more particularly to a circuit for preventing heat generation in internal circuit components.

[Conventional technology]

As a power transistor base drive circuit for each ignition coil in the engine control device, Japanese Patent Application Laid-Open No. 61-223233
Figure 1 is an example.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, even if the cylinder is not ignited, current flows through the resistor connected to the power transistor base of each ignition coil by the battery when the ignition coil of the other cylinder is energized. There was a problem.

[Means for solving problems]

The above object is achieved by disconnecting the resistor connected by the battery to the power transistor base of one ignition coil from the battery line and allowing current to flow through the resistor only when the ignition coil of the mountain cylinder is energized.

[Effect]

The CPU 4 outputs an ignition signal IGN to the electronic power distribution circuit 6 via the input/output device 3 based on the signals from the reference position detection device 1 and the angle detection sensor 2. i! The sub power distribution circuit 6 distributes the ignition signal IGN to each cylinder based on the signal from the reference cylinder detection circuit 5, and outputs IGNI to IGN6 (signals obtained by inverting the IGN signal and distributing it to each cylinder). IGNI～IG
Input N6 to the inverter of each cylinder and set the ignition signal IGNI.
~IGN6 is output. Since IGNI to IGN6 are energized only when the cylinder is ignited, heat generated by the resistance between the inverter output and the ignition coil power transistor is suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram of the present invention. A reference position detection device 1 that detects the reference position of each cylinder and an angle detection device that detects the crank angle! ! The input/output device 3 receives the reference position signal 1a, the angle signal 2a, and the signal of the intake air amount detection device 18 generated from the input/output device 2, and based on the data, the CPU calculates and determines the ignition timing and the energization time to the ignition coil. . The result of the above calculation is sent to the input/output device I! 3 is output as an ignition signal 3a. On the other hand, the reference position signal 1a and angle signal 2a are also input to a reference cylinder detection circuit 5 that detects a reference cylinder such as the first cylinder, and outputs a reference cylinder signal 5a. The reference signal 5a and the reference position signal 1a are input to an electronic power distribution circuit 6, and the ignition signal 3a is distributed to the ignition coil 7 provided for each cylinder.

Figure 2 is a portion corresponding to the electronic power distribution circuit extracted from Figure 1 of Japanese Patent Application Laid-Open No. 61-223233.
This corresponds to the electronic power distribution circuit 6 in the figure. Figure 2 is.

Resistance 10, 11, 12, 13, 14, 15, 16°17
．． 18, 19, 20, 21, transistor 30.31,
32, 33, 34, 35, and a power distribution circuit 60, the eight ignition signals 3a are the same as IGN in FIG.
, 34, 35 to the respective bases of IGNI, IGN2 . I
GN3゜IGN4. IGN5. Output IGN6. A in FIG. 4 is the ignition timing, and C is the energization time to each ignition coil. In FIG. 4, B is the timing for igniting the first cylinder, and the power transistor drive unit (transistor 30, resistor 1
0, 16), and the transistor 30 outputs IGN 1 to the OFFFL collector, that is, the ignition coil of the first cylinder. Since IGN2 to IGN6 are output to the second to sixth cylinders, resistances of 11 to 1
5, transistors 31 to 35 are turned on, so current always flows into the mountain cylinder even though the cylinder is not ignited. Therefore,
Resistors 10 to 15 generate heat.

FIG. 3 is an embodiment of the electronic power distribution circuit 6 of FIG. 1 of the present invention. Resistance 10, 11, 12, 13゜14.15, 16
, 17, 18, 19, 20° 21, transistor 30,
31, 32, 33° 34.35, inverter 40, 41
,42,43°44.45. It is composed of a power distribution circuit 60.

Considering the case of igniting the first cylinder, from the power distribution circuit 60,
IGNI is input to the base of transistor 30 on one hand and to inverter 40 on the other hand. According to the waveform in Figure 4, the first
While the cylinder is energized, the transistor 30 is OFF, and the output of the inverter 40 becomes Hi only during the period C in FIG. 4, and the waveform of IGNI appears.

IGN2 to IGN6 become Lo%I because the outputs of the inverters 41 to 45 are Low and the transistors 31 to 35 are turned on. Also, since the inverter output is Low, no current flows through the resistors 11 to 15, so the resistor 10
-15, heat generation is suppressed because current flows only when the ignition signal is input to the mountain cylinder.

Further, the power consumption of the resistors 10 to 15 is lower than that of the conventional resistors, and a small size (low power consumption) can be used.1 Since less heat is generated, the entire engine control device can be made smaller.

[Effects of the Invention] According to the present invention, the resistor connected to the power transistor base of the ignition coil in the electronic power distribution circuit is energized only when the mountain cylinder ignites.

It has the effect of reducing fever.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a conventional electronic power distribution circuit diagram, Fig. 3 is a diagram showing an embodiment of the electronic power distribution circuit of the present invention, and Fig. 4 is a waveform of each part. It is a diagram. 1... Reference position detection device, 2... Angle detection device, 3
... Input/output device, 4... CPU, 5... Reference cylinder detection circuit, 6... Electronic power distribution circuit, 7... Ignition coil, 8... Intake amount detection device, 1a... reference position signal,
2a...Angle signal, 3a...Ignition signal, 5a...
Reference cylinder signal, IGNI port 1 8・-aFJS”1.t, check mm1tt half 3 Figure

Claims (1)

[Claims] 1. A reference position signal generating device that generates a reference position signal to detect the position of each cylinder according to the rotation of an internal combustion engine having a plurality of cylinders, and an angle signal generating device that generates an angle signal according to the rotation angle of the engine. It is equipped with an intake air amount detection device that detects the intake air amount, an ignition coil for each cylinder, an electronic power distribution circuit that distributes an ignition signal to the ignition coil provided for each cylinder based on the signal, and an ignition coil drive What is claimed is: 1. An engine control device having a circuit, characterized in that only an ignition coil drive circuit of a cylinder to be ignited is energized.