JPS58500208A - igniter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Ichijoka Mutsukiichi The present invention relates to an ignition device with a preheating plug for use in internal combustion engines.

A preheating plug in an internal combustion engine brings the glow filament of the plug into a glowing state. It depends on the current source to maintain it. The power delivered to the filament is quite low e.g. For example, it is 4 watts, but the temperature control of the plug is necessary to keep the engine running smoothly. It must be done carefully.

In traditional preheating plugs, the battery is used as a current source without the need for a charging device. has been done. For small engines, such as those started by a rope starter. In many cases, batteries are a heavy and inconvenient accessory that should be avoided. Therefore , create an alternative current source for the preheat plug and maintain the plug at the appropriate temperature. It was found appropriate to incorporate a current control device for this purpose.

The present invention provides a preheating plug that is supplied from the generator via an electronic control circuit. An ignition device is provided.

This type of ignition system is superior to traditional spark-type igniters and preheating plugs with batteries. The equipment is also simple and inexpensive. Another advantage is that in the case of Su・Goku 2 ignition system, Effective and smooth idle operation is achieved. The preheating plug is an ordinary spark plug. ・The lug is very small and does not require high voltage insulation. This kind of preheating The advantages obtained by the lug device are carried out according to the parts characterized in claim 1. (by doing)

Embodiments of the ignition device according to the present invention will be described in the following section, which shows a simplified wiring diagram of the ignition device. According to the attached drawings consisting of Figure 1 and Figure 2 showing graphs of voltage characteristics of different parts. This is explained below.

The current source consists of an engine-driven generator 10 with an ignition device. There is. The preheating plug 11 is supplied with alternating current from the generator via an electronic switch 12. the switch 12 is turned on so that the preheating plug gets the set heating current. Control the flow. Plug temperature measurement is performed using a wheat strike, which is one side of the preheating plug resistance. This is done by link bridge 13. The other side of the bridge circuit has two fixed resistors 1 4.15 and a variable resistor 16. This variable resistor allows bridge It is possible to balance the engine and adjust the temperature of the plug, which will be described in detail below.

The test pulse is applied to one of the diagonal terminal pairs of the bridge circuit from the transistor amplifier 17. A voltage pulse is output from the other diagonal terminal pair to which the comparator 18 is connected. It will be done.

This comparator has one contact closed at a higher voltage at the first input 19; Equivalent to a differential relay circuit where the other contacts close at a higher voltage at the second input 2o The comparator of this embodiment has the function of the well-known standard monony It is LM 339 of Le. A signal in the form of a logical value “1” or 0” is connected to the two inputs. Depending on which one of them is in a higher state, it will be displayed.

This signal is a bistable frizz flow for a time of at least one cycle of the generator voltage. stored in the well-known Standard Mono A 4013, for example. . The stored signal is present at the output terminal 23 of the flip-flop 22 during this time. is maintained, and is led to, for example, the AND gate 24 of module LM 339.

The generation of test and Lus is monostable, Zoflozzo 25, for example, standard module. A node is set at the beginning of each positive half cycle of the generator voltage. The signal is sent to the transistor amplifier F through wires 2 and 6. Therefore, the measurement is carried out when no generator current is supplied to the preheating plug, and this has been tested ・Grus is the only condition necessary to pass through the bridge circuit during the test period.

The generator current is controlled by switch 12, which in this embodiment is Monostable flip-flop 29 (module 4098 ) two anti-parallel connected thyristors 27.2 receiving trigger pulses from It is made up of 8 parts. These trigger ξruses are compared to the ξruses on the wire 26. This is because the test pulse passes through the bridge circuit and This is because the thyristor starts energizing for the first time.

However, depending on the equilibrium of the Britno circuit, i.e. the temperature of the preheating plug is If the temperature exceeds low temperature and there is no pulse from F22 Then, the test node is stopped at the AND gate. Preheating during the test period If Zofronog 22 detects that the lag is too low, it will trigger – Gurus is sent through AND t” –). Then in the positive half cycle In the negative half cycle, one thyristor conducts and the other thyristor conducts during the negative half cycle. conducts and the preheating plug is powered by the generator for the entire period. Preheating plug is next Whether or not power is supplied during the cycle depends on the bridge circuit during the cycle. determined by the test. The control circuit controls the temperature of the preheating plug and the rotation speed of the generator. and control to maintain a constant temperature without being affected by ambient temperature. Preheating plug temperature The level of power can be changed by adjusting the variable resistor 16 of the bridge circuit.

FIG. 2 shows the voltage at each point in the circuit of this embodiment. supplied to each component The only current source used for the power generated is the generator, and the voltage shown is sine It is a curve. The above-mentioned module LM339 with a Zener diode connected A voltage converter 30 such as Change to a rectangular voltage waveform 31. The rectangular voltage is supplied to flip-flops 29 and 25. control pulse 32 and trigger pulse for testing the Britno circuit, respectively. Outputs 33. 7. Is Rinozofrotsuzo29 a converter in addition to Furi, Zofro, and Zo25? The number of pulse signals 33 is therefore twice the number of pulse signals 32. . In order to generate potentials and operating voltages for different components of the circuit, the generated voltage is completely A rectifier circuit 34 is provided to rectify the direct current.

The aforementioned Ennon is a small type used for electric machines such as electric saws and lawn mowers. Considering this, it is started manually.

The generator is driven by the ennon during the start-up procedure and the glow filament is - Supply power to the preheating plug to reach the discharge temperature. And that is , the fact that the glow filament has a low heating period (results around 4W) It is very easy to operate, and the generator is already running at low speeds (approximately 1000 r, p, m). All electricity is supplied by the station. When the engine is rotating at high speed, the generator also It rotates at high speed and supplies a high voltage that is too high for the preheating plug. Therefore, this The voltage to the preheating plug of the or by a shunt such as a nonlinear resistor (thermistor) (not shown). can be limited.

This embodiment is an example in which the present invention is implemented. In fact, DC generators also use preheating plugs. It can be used as a current source for other components.

i dispute ♂ (content: no change) Procedural amendment (formality) %formula% Ippatsu Ming name Mu igniter 3 Person making the amendment Relationship to the case: Applicant Sweete/Kingdom Nis-56124 Hiuskuvarna.

1"'i O'yj21010 (No. 7 not shown) 5"g-Continuation correction command station- date of October 21, 1980 (Shipping date: October 26, 1981) 6. Increased by 1 month. Number of inventions to be added 07 Target of amendment [translation of oil n1 M.

Claims (1)

[Claims] l A preheating plug used in an internal combustion engine, a current source for the preheating plug, and in a control device for a heating current reservoir for the preheating plug, the current source is driven by the engine and mechanically coupled to the starter of the engine. An ignition device comprising a generator (10). 2. The circuit of the control device is mechanically driven by the generator. An ignition device according to claim 1. 3 The circuit of the control device connects the temperature sensor (1) to the filament of the preheating plug (11). 3, 17), and the switch and te (12) in the heating circuit of the plug are connected to the signal from the sensor. The ignition device according to claim 2, wherein the ignition device is controlled according to the following. 4 The sensor has a - side made up of a filament resistor and the other side made up of a variable resistor (16 ) A measurement circuit (13) comprising: Ignition device as described. 5. The variable resistor determines the level of the glow discharge temperature of the preheating plug. An ignition device according to claim 4. 6. The measuring circuit is connected to the filament in parallel with the heating circuit, and the circuit is connected to the filament in parallel with the heating circuit. Testing of circuits, heating current from main pulse and generator, The point according to claim 4, characterized in that the filament is switched into a filament inside. Fire device. 7. The heating circuit has a limiting resistor to protect the filament. The ignition device according to claim 3, characterized in that: