JPS6147308B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric engine ignition timing control device that controls engine ignition timing based on the heat generated by an engine (engine temperature).

[Conventional technology]

In the conventional example of this kind, as in Utility Model Application No. 51-15522, a temperature sensor is attached to an insulating board inside the case of the ignition unit, and the temperature rise due to the heat generated by the semiconductor switching element of the ignition unit is measured by the temperature of the air inside the case. By detecting this, the ignition timing was indirectly detected and controlled.

[Problem that the invention seeks to solve]

For the conventional Utility Model Application No. 15522, 1972,
Since the engine's ignition timing is controlled by detecting the air temperature inside the ignition unit case, the time for the temperature inside the ignition unit case to reach a predetermined value is approximately 15 to 20 minutes behind the engine temperature. During this period, it was difficult to optimally control the ignition timing. In addition, there are differences between the heat generated by semiconductor elements and the water temperature of the internal combustion engine depending on the outside temperature and operating conditions.
There was a problem that the engine water temperature was not detected correctly, making ignition timing control inaccurate.

This invention has been made to solve these problems, and provides an electric engine ignition timing control device that can perform accurate ignition timing control according to engine temperature and can easily attach a temperature sensing element. The purpose is to

[Means for solving problems]

The first invention of this application is configured such that a temperature sensing element is directly attached to a metal power distribution housing to which heat generated by an engine is directly transmitted. Further, a second invention of this application is configured such that a temperature sensing element is attached to a metal power distributor housing via a metal heat sink of an ignition unit.

[Effect]

In the first invention of this application, the temperature sensing element directly detects the engine temperature from a metal power distribution housing that is attached to the engine and to which the heat generated by the engine is directly transmitted, and detects the engine temperature. In addition to eliminating temperature delays, the engine's ignition timing can be controlled using accurate detection output regardless of outside temperature, operating conditions, etc.

In addition, in the second invention of this application, the temperature of the engine is detected by a temperature sensing element through metal members such as the power distribution housing and the heat sink of the ignition unit, and the temperature of the engine is detected by an accurate detection output similar to that described above. Ignition timing will be controlled.

〔Example〕

Hereinafter, this invention will be explained in detail with reference to the drawings. In FIG. 1 showing the embodiment of the first invention, 1
is the case of the engine, which is made of a metal material with good thermal conductivity. Reference numeral 2 denotes a housing of a power distributor whose cylindrical portion 2a is inserted into a mounting hole 1a of the engine case 1 and fixed to the engine case 1 with bolts 3, and is integrally molded from an aluminum material having good thermal conductivity. Reference numeral 4 denotes a rotary shaft rotatably supported by the housing 2 via a bearing 5, and a pawl 6.
It is rotationally driven by the engine via. 7 is a cylindrical body which is loosely fitted on this rotary shaft 4 and has a signal rotor 8 fixed thereto; 9 is a movable plate rotatably mounted on a fixed plate 10 fixed in the housing 2; A permanent magnet 12 and a stator 13 that cooperate with the signal rotor 8 to cause the signal coil 11 to generate an ignition signal are installed on the permanent magnet 9 . The movable plate 9 is rotationally controlled by a vacuum device that responds to engine intake negative pressure. An ignition unit 14 is installed on the mounting seat 2b of the housing 2 and fixed with a bolt 15, and has a built-in semiconductor ignition circuit described later. 14a is this ignition unit 1
4, and is in close contact with the mounting seat 2b of the housing 2. Reference numeral 16 denotes a governor device that is installed between the rotating shaft 4 and the cylinder body 7 and controls the rotation of the cylinder body 7 in response to the engine speed; 17 is a power distribution cap that is fitted and fixed to the housing 2 so as to close it; A power distribution device that distributes ignition voltage is configured in cooperation with a power distribution rotor 18 fixed to a base 16a. Reference numeral 19 denotes a temperature sensing element, such as a thermocouple or a thermistor, attached to the bottom 2c of the housing 2, which is connected to the cylindrical part 2a. This temperature sensing element 19 generates an electric signal (voltage, etc.) corresponding to the heat conducted to the bottom portion 2c of the housing 2 with a certain correlation to the engine temperature. 2
0 and 21 are connectors and lead wires for guiding electrical signals from the temperature sensing element 19 to the ignition unit 14;
0 is plugged into the ignition unit 14 and electrically connected.

Next, the ignition system controlled by the signal coil 11 and temperature sensing element 19 of the signal generator will be described in detail with reference to FIG. With semiconductor ignition circuit,
It is composed of a waveform shaping section 23, a retard section 24, a retard control section 25 that receives an electrical signal from the temperature sensing element 19 and controls the retard section 24, an amplification section 26, and a power transistor 27. Reference numeral 28 denotes an ignition coil that induces an ignition voltage by the power transistor 27 turning on and off the current supplied from the battery 29 .

Now, the operation of this embodiment is carried out by the engine on the rotating shaft 4.
As is well known, if the signal rotor 8 is driven to rotate, the signal rotor 8
As a result of the rotation, an ignition signal synchronized with the engine speed is generated in the signal coil 11, and the generation timing of this ignition signal (substantially the engine ignition timing) is determined by the governor device 16.
The vacuum device advances or retards the engine speed in response to the engine speed, and the vacuum device advances or retards the engine in response to the engine intake negative pressure. The ignition signal whose generation timing is controlled in this manner is waveform-shaped by the waveform shaping section 23 of the semiconductor ignition circuit 22.If the retardation section 24 is not operating, the amplification section 26 generates a signal based on the waveform shaping signal. The ignition coil 2 is turned on and off by controlling the power transistor 27.
8 induces an ignition voltage, and this ignition voltage is distributed to the required spark plugs by a power distribution device consisting of a power distribution rotor 18 and a power distribution cap 17.

Here, the method of controlling the engine ignition timing using the electric signal generated by the temperature sensing element 19 will be described in detail. It emits an output signal for actuation. The above-mentioned predetermined level is a control level that determines the temperature state of the engine temperature and how the engine ignition timing must be controlled in response to this state. That is, the temperature sensing element 19 is attached to the bottom 2c of the housing 2 to detect the engine temperature, and the engine case 1 is attached to the bottom 2c of the housing 2.
Housing 2 attached directly to this case 1 from
Since heat that is proportional to the engine temperature (generated heat) is conducted through the cylindrical portion 2a, the temperature sensing element 19 generates an electric signal corresponding to the heat (temperature) of the bottom portion 2c. Become. For example, if the engine temperature is extremely low, the bottom 2 of the housing 2
Since the temperature at c is still low, the electrical signal of the temperature sensing element 19 is low and does not reach the predetermined level, so that the retard control section 2
5. The retard part 24 is in a non-operating state. the result,
As described above, the amplifying section 26 controls the power transistor 27 to turn off at the engine ignition timing based on the output signal of the waveform shaping section 23, thereby interrupting the current flowing through the ignition coil 28 and inducing an ignition voltage. If this engine ignition timing is set in advance to be more advanced than the normal ignition timing, the engine can be suitably controlled by the advanced setting when the engine temperature is low.

When the engine temperature rises from a low temperature to a predetermined temperature, the temperature of the bottom 2c of the housing 2 will inevitably rise, so if this temperature reaches a predetermined level or higher, the temperature sensing element 19 detects this and sends an electrical signal. occurs. At this time, when this electric signal reaches a predetermined level, the retard control section 25 receives this electric signal and issues an output signal to the retard section 24, so that the retard section 24 is activated and the waveform shaping section 23 outputs an output signal. The output signal of the engine is controlled so that the engine ignition timing is retarded. The amplifying section 26 turns off the power transistor 27 at the engine ignition timing based on the controlled output signal (this becomes the regular ignition timing), thereby inducing an ignition voltage in the ignition coil 28.

As mentioned above, the temperature sensing element 19 detects the engine temperature through the bottom 2c of the housing 2 and controls the engine ignition timing based on the electrical signal.
This is just an example; other examples include when the engine temperature is low,
In other words, it is possible to retard the engine ignition timing to below a predetermined level of the electrical signal, and to control the ignition timing to the normal ignition timing when the electrical signal exceeds this level.Also, it is possible to gradually advance or retard the engine ignition timing in response to a rise in the electrical signal. Corner, etc.
Various controls are possible.

By the way, as mentioned above, the housing 2 is made of a metal material with extremely good thermal conductivity, such as aluminum, so even if the temperature sensing element 19 is attached to the bottom part 2c of the housing 2, the temperature sensing element 19 detects the engine temperature with almost no time delay. It can be detected without
There is no problem with control. Therefore, the same control can be performed no matter where the housing 2 is attached.

FIG. 3 shows an embodiment of the second invention, in which the temperature sensing element 19 is built into the ignition unit 14, the electrical connection between the temperature sensing element 19 and the ignition unit 14 is simplified, and the assembly is easy. This makes it extremely easy to install and also solves the problem of installation space.
That is, the temperature sensing element 19 is directly attached to the heat sink 14a within the ignition unit 14, and the electrical connection between the temperature sensing element 19 and the retard control section 25 of the semiconductor ignition circuit 22 is processed within the ignition unit 14, for example, through the semiconductor ignition circuit. If 22 is integrated into an IC, this is done at the same time when it is manufactured.

Even in this case, the temperature sensing element 19 measures the engine temperature from the mounting seat 2b of the housing 2 to the heat sink 1.
4a, and controls the engine ignition timing in the same way as described above.

Note that the technical idea of the present invention is not limited to the above-mentioned embodiments, but includes various embodiments. For example, although the ignition unit 14 is mounted inside the housing 2, it may be mounted outside.

〔Effect of the invention〕

As described above, according to the first invention of this application, a temperature sensing element for detecting engine temperature (generated heat) is installed in the housing of a metal power distribution device through which heat having a certain correlation with the engine temperature is conducted. By directly mounting the water temperature sensor, compared to the conventional method of mounting the water temperature sensor directly on the engine, it is possible to avoid restrictions on installation space, and the electrical connection between the ignition unit and the temperature sensing element can be made extremely easily. Become.

In addition, since the heat that has a certain correlation with the heat generated by the engine can be detected by a temperature sensing element through a metal member, it is possible to detect heat that has a certain correlation with the heat generated by the engine. Compared to those that detect the engine temperature, there is no delay in the detection output depending on the engine temperature, and since it is not related to outside temperature or operating conditions, it accurately detects the engine temperature and performs reliable ignition timing control. becomes possible.

Furthermore, according to the second invention of this application, the temperature sensing element is attached to the heat sink of the ignition unit, and the heat generated by the engine is detected through the power distributor housing and the heat sink, so that in addition to the above-mentioned effects, There are advantages in that the temperature-sensitive element can be easily attached and wired, manufacturing can be facilitated, and the installation space can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the first invention;
FIG. 2 is a configuration diagram showing an engine ignition timing control circuit, and FIG. 3 is a sectional view showing an embodiment of the second invention. In the figure, 1 is the engine case, 2 is the housing,
2a is a cylinder part, 2b is a mounting seat, 2c is a bottom part, 4 is a rotating shaft, 8 is a signal rotor, 11 is a signal coil,
12 is a permanent magnet, 13 is a stator, 14 is an ignition unit, 14a is a heat sink, 17 is a cap, 19 is a temperature sensing element, 20 is a connector, 21 is a lead wire, 22 is a semiconductor ignition circuit, 24 is a retard part,
25 is a retard control section, and 28 is an ignition coil.
Note that the same reference numerals in each figure indicate the same parts.

Claims (1)

[Scope of Claims] 1. A metal power distribution housing that is attached to an engine and conducts heat that has a correlation with the heat generated by the engine, and a metal power distribution housing that is built in this housing and that operates in synchronization with the rotation of the engine. A signal generator that generates an ignition signal, and an ignition unit that determines the engine ignition timing based on the engine ignition signal and generates an ignition voltage to the ignition coil, which is directly attached to the power distributor housing. 1. An electric engine ignition timing control device, comprising: a temperature sensing element that generates an electric signal corresponding to the heat of the engine; and controlling the engine ignition timing of the ignition circuit based on the electric signal of the temperature sensing element. 2. A metal power distribution housing that is attached to the engine and conducts heat that is correlated with the heat generated by the engine, and a signal that is built into this housing and generates an engine ignition signal in synchronization with the rotation of the engine. A generator, and an ignition unit installed in the power distributor housing to determine engine ignition timing based on the engine ignition signal and generate ignition voltage to the ignition coil, wherein the power distributor housing is installed in the ignition unit. A temperature sensing element is provided which is directly attached to the metal heat sink bonded to the housing and generates an electrical signal corresponding to the heat of the power distribution housing,
An electric engine ignition timing control device, characterized in that the engine ignition timing of the ignition unit is controlled by an electric signal from the temperature sensing element.