JPS5825575A - Apparatus for controlling ignition timing in internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent knocking by controlling ignition timing in response to temperature and humidity of intake air. CONSTITUTION:Temperature and humidity of intake air are detected respectively by a temperature sensor 5 and a humidity sensor 6. Delay angle is slightly controlled when an engine is under the intake condition (high temperature and humiity) in which knocking hardly occurs, and largely controlled when under the intake condition (low temperature and humidity) in which knocking is liable to occur. If a vibration sensor is provided in addition to these sensor 5, 6, the ignition timing can be controlled more accurately. Thus, the knocking can be prevented irrespective of the increase of mechanical vibration due to season and degradation of the engine caused by a secular change.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine ignition timing control device that electronically controls the ignition timing of an internal combustion engine.

A conventional device of this type is shown in FIG. In Figure 1,
Reference numeral 1 detects the angular position of an internal combustion engine (hereinafter simply referred to as the engine), which is not shown, and outputs an angular position signal of the engine in synchronization with the rotation of the engine. Reference numeral 2 detects vibrations of the engine. a vibration detector; 3 a control voltage generator that outputs a control voltage that determines the ignition position for operating the engine without knocking based on the vibration detection signal output from the vibration detector 2; 4 a control voltage generator 3; This constant chain angle controller outputs a signal that is retarded with respect to the angular position signal outputted from the angular position detector 1 according to the control voltage outputted from the angular position detector l.

Figures 2 (&) to d) are signal waveform diagrams of each part (a) to d) in Figure 1, and (a) is the angular position detector l.
(b) is the vibration detection signal waveform from the vibration detector 2, (e) is the control voltage waveform output from the control voltage generator 3, @) is the output of the constant chain angle controller 4 Shows the signal waveform.

Next, the operation of the above-mentioned conventional device will be explained. First, the time point 1 in Figure 2 is when no knocking occurs in the engine. Shown below. At this time t1, the vibration detector 2 outputs a vibration detection signal b1 caused only by the normal mechanical vibration of the engine. This vibration detection signal b1 is transmitted to the control voltage generator 3.
The control voltage generator 3 determines that there is no knocking, and therefore the control voltage c1 output from the control voltage generator 3 is zero. Since the input control voltage c1 is 0, the short chain angle controller 4 does not perform a retarding operation, and its output signal d is synchronized with the angular position signal a1 from the angular position detector l. Next, time t! When knocking occurs in the engine, the vibration detector 2 outputs a vibration detection signal b2 which is a combination of the normal mechanical vibration of the engine and the knocking. This vibration detection signal b- is supplied to a control voltage generator 3, which determines that there is knocking and outputs a control voltage c2 corresponding to the knocking intensity. The short chain angle controller 4 receives the control voltage J and outputs a signal d2 delayed from the angular position signal al from the angular position detector 1 by an angle proportional to the control voltage cz.

In this way, the engine's ignition timing is retarded)
Even if knocking occurs, it is suppressed, and the control voltage c3 gradually decreases until the knocking finally disappears and becomes 0. If knocking occurs again, the control voltage c
1 increases and the above operation is repeated.

However, in the conventional device described above, the control voltage el for changing the ignition timing characteristics is generated and control is started only after knocking occurs in the engine. There is a possibility that knocking will continue to occur until the ignition timing control angle is stabilized. In addition, since the occurrence of knocking is greatly affected by the condition of the engine intake air (temperature, humidity, pressure, etc.), there may be cases where unnecessary control is performed even though it is unnecessary due to seasonal differences. , or it may become difficult to control. Furthermore, since the system detects and controls the engine's vibrations, the normal mechanical vibrations of the engine may increase due to deterioration of the engine over time, resulting in poor controllability and force.

This invention was made in view of the above circumstances,
Focusing on the fact that the temperature and humidity of the air taken into the engine greatly affect the occurrence of engine knocking, by detecting and controlling the temperature and humidity of the air taken into the engine, we can prevent the occurrence of knocking and prevent it from occurring depending on the season. It is an object of the present invention to provide an internal combustion engine ignition timing control device that can reliably and with good controllability prevent aging deterioration of an engine.

The present invention will be described in detail below with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing an embodiment of the internal combustion engine ignition timing control device according to the present invention, in which 5 is a temperature detector for detecting the temperature of the air taken into the engine, and 6 is a temperature detector that detects the temperature of the air that is also taken into the engine. Humidity detector that detects air humidity, 7
is a control voltage generator which outputs a control voltage to control the ignition position to operate the engine in the best condition based on the output signal of the temperature detector 5 and the output signal of the humidity detector 6. Note that 1 is the first
The angular position detector 4 similar to that shown in the figure is also a short chain angle controller similar to that shown in FIG.

Figure 4 G) or e) is (a) or G in Figure 3)
In the signal/waveform diagrams of each part, (a) is the angular position signal waveform from the angular position detector 1, (b) is the output signal (voltage) waveform of the temperature detector 5, and (e) is the output of the humidity detector 6. Signal (voltage) waveform, @) shows the control voltage waveform output from the control voltage/generator 7, and (e) shows the output signal waveform of the constant retard angle controller 4.

Next, the operation of the above-mentioned device of the present invention will be explained.

First, the intake conditions (high temperature,
The time (high humidity) is shown at time t1 in FIG.

At this time t1, the temperature detector 5 and the humidity detector 6 output signals S and el. This output signal 1
)ftel is supplied to the control voltage generator 7, which calculates the output signals bl, c1, and outputs the control voltage d.
Outputs 1. The constant retard controller 4 inputs the control voltage d1 and performs retard control on the angle and position signal a1 from the angular position detector l, but at time t1, the control voltage d! Since the level of the angular position signal a! is low, the angular position signal a! Next, at time t3, when the intake air condition (low temperature, low humidity) is likely to occur in the engine, the temperature sensor 5 and the humidity sensor The device 6 outputs the signal b*e'3*. This output signal b! , c1 are supplied to a control voltage generator 7, which calculates an output signal k)lsel and outputs a control voltage d2. The constant chain angle controller 4 uses the control voltage d3
is input, and retard control is performed on the angular position signal a3 from the angular position detector 1. However, since the level of the control voltage d3 is high at time t2, the signal e3 is greatly retarded with respect to the angular position signal JLI. This output prevents knocking from occurring. f In the above-mentioned embodiment, the case where voltage is output as a signal from the temperature detector 5 and the humidity detector 6 was explained, but it is not limited to this only, and in addition, electric current, resistance value, etc. Any of these may be used as long as it can be converted into physical quantities.

Furthermore, the way the output changes are expressed does not necessarily have to be analog. For example, the rain detectors 5 and 6 can be output digitally using switches that turn on and off at predetermined temperatures and humidity. It may be changed, and furthermore, depending on the season and other settings, it is possible to create an initial set that approaches the knock limit.

In addition, in addition to the temperature and humidity detectors of the engine intake air, an engine vibration detector is also provided as in the conventional device, and if the vibration detection signal is also subject to calculation in the control voltage generator, seasonal,
Better ignition position control is possible under all conditions of air-fuel ratio and operating conditions.

As described above, according to the present invention, since the ignition timing is controlled by detecting the temperature and humidity of the engine intake air, it is possible to prevent the occurrence of knocking and to prevent mechanical vibrations caused by seasons or engine deterioration over time. This has the effect of being able to reliably prevent the problem without being affected by the increase, and with good controllability.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional device, Fig. 2 (&) or Φ is a signal waveform diagram of each part (a) to @) in Fig. 1, and Fig. 3 is an internal combustion engine ignition timing control device according to the present invention. FIG. 4 is a block diagram showing one embodiment of the present invention, and FIG. 4 is a signal waveform diagram of each part of FIG. 3. l... Angle position detector, 4... Fixed angle controller, 5.
...Temperature detector, 6-...Humidity detector, 7...Control voltage generator. In addition, the same reference numerals in the figures indicate the same parts, and 9 indicates the corresponding parts. Agent Shin Kuzuno - O 1 Figure 121! I

Claims (1)

[Claims] An angular position detector that detects the angular position of the internal combustion engine, a temperature detector and a humidity detector that detect the temperature and humidity of the air taken into the internal combustion engine, and outputs from the temperature detector and humidity detector, respectively. a control voltage generator that outputs a control voltage that determines the ignition position for operating the internal combustion engine in the best condition according to a signal generated by the engine; and an output from the angular position detector according to the control voltage of the control voltage generator. 1. An ignition timing control device for an internal combustion engine, comprising: a constant retard controller that outputs a signal retarded with respect to an angular position signal.