JPH0444855Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a determination device for determining the ignition state of an engine plug.

[Conventional technology]

To judge or check the ignition status of conventional engine plugs, remove the plug from the engine, measure it with a feeler gauge, or adjust the timing of high voltage generation to ensure a good ignition status. I tried to bring it with me.

[Problem that the invention attempts to solve]

The conventional determination method described above has the following problems.

There is the inconvenience of having to stop the engine and remove the plug from the engine.

Since the spark condition is indirectly estimated by stopping the engine, it is difficult to estimate the actual spark condition while the engine is running.

Even if the plug appears normal, you cannot tell whether high voltage is being applied to the plug and discharging it just by looking at the plug.

The present invention aims to provide an engine plug spark state determination device that can solve the above-mentioned conventional problems.

[Means for solving problems]

The present invention will be explained in detail below based on the drawings. 1 is a main body case with a size that can be put in a pocket; 2 is an electrode support case provided at the tip of the main body case 1; A detection electrode 3 is supported. 4 is a current detection coil attached to a position close to the electrode 3 in the electrode support case 2; 5 is an indicator light for displaying the voltage status; They are connected via a circuit 10 which is connected in the order of circuit 9. Reference numeral 11 is an indicator light for current judgment, and the coil 4 has an amplifier 12 and a comparator 1.
3. Circuit 15 connected in order of switch circuit 14
It is connected via. The indicator lights 5 and 11 are attached to the surface of the main case 1, and the circuits 10 and 15 are built into the main case 1. A battery 16 supplies power to the circuits 10 and 15, and is incorporated into the main body case 1. Reference numeral 17 denotes a power switch for operating the circuits 10 and 15, which is built into the main body case 1. 18 is the ground clip, lead wire 1
It is connected to the voltage dividing capacitor 6 via 9. 20 is a high voltage cable connected between the ignition coil of the engine and the plug, and 21 is the equivalent capacitance between the core wire of the cable 20 and the electrode 3.

[Effect]

While the engine is running or when the engine is started, the electrode 3 is pressed onto the sheath of the high voltage cable 20, the ground clip 18 is connected to the metal case of the engine, and the power switch 17 is turned on.

In this state, the state of the plug can be determined as follows based on whether the indicator lights 5 and 11 are lit or not.

Both voltage indicator light 5 and current indicator light 11 are lit...
Both the spark state and high voltage generation state are normal.

Only the voltage indicator light 5 is on... Voltage is being applied to the plug, so the high voltage generation circuit is good, but there is no fuel, and the plug is probably defective.

Only the current indicator light 11 is lit...The specified voltage is not generated. The plug is discharging.

Both voltage indicator light 5 and current indicator light 11 are off...
...High voltage is not occurring. Defective voltage generation circuit.

[Effects of the invention] Since the present invention is constructed as described above, it has the following effects.

To determine whether a plug is good or bad and whether a high voltage generation circuit is good or bad can be determined without removing the plug from the engine.

If the engine has several cylinders, check whether the plug is good or bad and whether the high voltage generation circuit is good or bad while the engine is running. If the engine has one cylinder, check whether the plug is good or bad and whether the high voltage generation circuit is good or bad when the engine is started. It is possible to judge whether the voltage generation circuit is good or bad.

Since the indicator light can instantly determine whether the plug and the high voltage generation circuit are good or bad, the time required for judgment can be significantly shortened.

Judgments remain stable even if the person performing the measurement changes.

Since the size of the determiner is small enough to fit in a pocket, it is convenient and easy to carry.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an external view of a determining device according to the present invention, FIG. 2 is a circuit diagram, and FIG. 3 is a diagram showing the state of use. 1... Main body case, 3... Voltage detection electrode, 4
...Current detection coil, 5...Voltage indicator light, 6...
... Voltage dividing capacitor, 7... Amplifier, 8... Comparator, 9... Switch circuit, 11... Current indicator light,
12...Amplifier, 13...Comparator, 14...Switch circuit, 16...Battery, 17...Power switch.

Claims (1)

[Scope of utility model registration request] A voltage detection electrode made of a curved metal plate, a current detection coil installed near the electrode, a voltage indicator light, and a current indicator light are attached to the main body case, which is small enough to be put in a pocket. , the main body case has a circuit that connects the electrode and the voltage indicator light, which is a voltage dividing capacitor, an amplifier, a comparator, and a switch circuit connected in this order, and a circuit that connects the coil and the current indicator light. An engine plug spark state determination device which incorporates a circuit in which an amplifier, a comparator, and a switch circuit are connected in this order, a battery that supplies power to these circuits, and a power switch.