JPH02301667A - Ignition timing controller of internal combustion engine - Google Patents

Abstract

PURPOSE:To improve precise ignition timing control by providing, in an ignition timing control unit, a correction calculating means which corrects a rotation sensor detection angle position or ignition timing according to the energizing current in an ignition coil. CONSTITUTION:In the event that there occurs an error in the detection angle of a rotation sensor 3, the error in the detection angle has a correlation to the average of the primary current or cut-off current value of an ignition coil 5, so it can be obtained by determining the error in the detection angle from the average current value or the cut-off current value. The error angle signal of the rotation sensor 3 is corrected by a correction circuit 12. By carrying out corrective calculation for the error in the detection timing of the angle detection signal of the rotation sensor 3 inputted by a microcomputer 9 utilizing the corrected signal or correcting the error in the detection at the time of ignition timing control, it is possible to provide precise ignition timing control even if an error in the detection occurs in the rotation sensor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to improving an ignition timing control device for an internal combustion engine.

[Prior Art] FIG. 4 is a diagram showing the configuration of a conventional ignition timing control device for an internal combustion engine. In FIG. (2)
is a rotating body connected to the camshaft of an engine (not shown),
A shielding plate (indicated by a broken line in the figure) is provided in a predetermined angular section. (3) is a rotation sensor, consisting of a Hall element and an output circuit.

A high level or low level signal is output depending on whether or not the shielding plate of the rotating body (2) is in the sensor gap.

In other words, the output signal is inverted every predetermined angle set for the rotating body (2). (4) is a unit including a rotation sensor (3), which is built into the distributor (1). Further, the unit (4) has a built-in switching circuit (not shown) that cuts off and on the negative side current of the ignition coil (5). (6) is a load sensor.

Various sensors such as water temperature sensor, (7) is rotation sensor (3)
(8) is an output interface that is connected to the unit (4), and (9) is a microprocessor that is connected to the input interface (7), the output interface (8), and various sensors (6). ing. (10) is a ROM, which is interconnected with the microprocessor (9) via a bus. (11
) is the RAM, which is connected to the microprocessor (9) via the bus.
and are interconnected.

In addition, input interface (7), output interface (8), microprocessor (9), ROM (1
0).

Ignition timing control unit (1) consisting of RAM (11)
3) consists of a microcomputer.

FIG. 5 is a diagram showing operating waveforms of each part in FIG. 4.

The conventional ignition timing control device for an internal combustion engine is configured as described above, and the output signal of the rotation sensor (3) shown in FIG. 2(a) is input to the microprocessor (9) via the input interface (7). Ru. Based on the output signal (angle detection signal) of the rotation sensor (3), the microprocessor (9) adjusts the ignition timing according to the output signals of various sensors (6) such as a load sensor and a water temperature sensor. One ignition signal is calculated and outputted to the switching circuit of the unit (4) via the output interface (8), and the energization to the ignition coil (5) is interrupted. Ignition coil (5) at this time
The -order rfs current of is shown in FIG. 5(b).

[Problem to be solved by the invention] In the conventional ignition timing control device for internal combustion engines as described above, 1
2 because the ignition coil is installed near the rotation sensor.
There has been a problem in that leakage magnetic flux due to the current flowing through the ignition coil affects the detection element (Hall element) of the rotation sensor, causing an error in the detection angle of the one-rotation sensor.

The present invention has been made to solve such problems, and provides an ignition timing control device for an internal combustion engine that can accurately control ignition timing even if a detection error occurs in the detection angle of the rotation sensor due to the influence of leakage magnetic flux. The purpose is to

[Means for Solving the Problems] An ignition timing control device for internal combustion engines according to the present invention includes a rotation sensor that detects the rotation angle position of one engine.

an ignition timing control unit that inputs the output signal of the rotation sensor and the output signal of another sensor that detects the operating state of the engine, and calculates and controls the ignition timing according to these signals;
The ignition coil is installed in the same housing as the rotation sensor and outputs a high voltage for ignition in synchronization with the output signal of the ignition timing control unit.

[Operation] In the present invention, one ignition timing control unit includes a correction calculation processing means for correcting the detected angular position of the rotation sensor or the ignition timing in accordance with the current flowing through the ignition coil.

[Embodiment] FIG. 1 is a diagram showing the configuration of an ignition timing control device for an internal combustion engine according to an embodiment of the present invention.
(11) is the same as the conventional one. (12) is a correction circuit that is installed between the input interface (7) and the microprocessor (9) and corrects the detected angle error value from the one-rotation sensor (3) on the input side.
9) and is also connected to the microprocessor (9) via a bus. Note that 1 ignition timing control unit (
13A).

Input interface (7), output interface (
8), microprocessor (9), ROM (10) RA
It is composed of M (11) and a correction circuit (12).

In the ignition timing M control device for internal combustion engines configured as described above, the general ignition timing control operation is the same as that of the conventional one. Now, if an error occurs in the detected angle of the rotation sensor (3) as shown by the broken line in section 5, this detected angle error correlates with the average value of the negative side current or the breaking current value of the ignition coil (5). Therefore, the error angle signal of the 0 rotation sensor (3) obtained by calculating the detected angle error value from these average current values or cut-off current values is sent to the correction circuit (
12). Rotation sensor (3) inputted to microcomputer (9) using this corrected signal
Accurate ignition timing control can be achieved even if a detection error occurs in the rotation sensor (3) by correcting the detection timing of the angle detection signal by the error amount or by correcting the detection error amount during ignition timing control. 6. A flowchart of the operational steps in the case where the ignition timing is corrected and calculated based on the above-mentioned average current value is shown in FIG. In this case, calculation of the average current value (step SL
) → Calculation of correction value (Step S2) → Calculation of ignition timing (
A series of operations from step S3) to setting the ignition timing + correction value in the timer (step S4) is performed.

Further, FIG. 3 shows a flowchart of the operation steps in the case where the detection timing of the angle detection signal is corrected and calculated based on the above-mentioned breaking current value. In this case, interrupt current calculation (step 5IO) → correction value calculation (step 51
A series of operations from 1) to correction value output (step 512) are performed.

In the above embodiment, the output signal of the rotation sensor (3) is corrected on the input side of the microcomputer (9), but the output signal of the one rotation sensor (3) is directly input to the microcomputer (9) as it is, and the microcomputer (
Even if the correction is performed on the output side of the microcomputer (9) after the arithmetic processing in step 9), the same effect as in the above embodiment can be obtained.

[Effects of the Invention] As explained below, the present invention includes a rotation sensor that detects the rotation angle position of one engine, and an output signal of this rotation sensor and an output signal of another sensor that detects the operating state of the engine. , an ignition timing control unit that calculates and controls ignition timing according to these signals, and the rotation sensor are installed in the same housing part.

The ignition coil outputs a high voltage for ignition in synchronization with the output signal of the ignition timing control unit, and the ignition coil outputs a high voltage for ignition in synchronization with the output signal of the ignition timing control unit. Since the correction is made in accordance with the energizing current, even if a detection error occurs in the detection angle of the one-rotation sensor, accurate ignition timing control can be performed.

[Brief explanation of drawings]

FIG. 1 is a detailed diagram of an ignition timing control device for an internal combustion engine according to an embodiment of the present invention, FIGS. 2 and 3 are operational flowcharts of the present invention, and FIG. 4 is a conventional ignition timing control system for an internal combustion engine. FIG. 5 is a diagram showing the configuration of the apparatus, and is an operational waveform diagram of each part of FIG. 4. In the figure, (1)...distributor. (3)...Rotation sensor, (5)...Ignition coil. (6) Various sensors, (9) Microprocessor, (12) correction calculation processing means, (13A)...
This is an ignition timing control unit.

Claims (1)

[Claims] A rotation sensor that detects the rotational angular position of the engine, and an ignition system that inputs the output signal of this rotation sensor and the output signal of another sensor that detects the operating state of the engine, and calculates and controls the ignition timing according to these signals. The ignition timing control unit includes a timing control unit, and an ignition coil that is installed in the same housing as the rotation sensor and outputs a high voltage for ignition in synchronization with an output signal of the ignition timing control unit. An ignition timing control device for an internal combustion engine, comprising a correction calculation processing means for correcting the angular position detected by the rotation sensor or the ignition timing in accordance with the current flowing through the ignition coil.