JPS6221696Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention applies a high voltage between electrode plates disposed on both sides of a filter member so as to face each other to form an electrostatic field, thereby removing carbon particles in engine oil from the filter member. This invention relates to an energizing circuit for an electrostatic filter for automobiles that collects adhesion to members.

In this type of filter, the battery voltage is boosted by a high voltage generator to apply a high DC voltage between the electrode plates that form an electric field. Therefore, when replacing the filter or inspecting the inside of the engine room, sufficient consideration must be taken to prevent electric shock.

Among this type of devices, there is one that stops the high voltage generator when the vehicle's running speed drops below a predetermined value in order to prevent current leakage and electric shock in the event of a collision (Utility Model Application No. 57-95410). ).

When using this method, the above-mentioned risk of electric shock is eliminated.

However, if the traveling speed falls below a predetermined value, even if this is not due to an accident, the operation of the high voltage generator is stopped, and the electrostatic filter is no longer able to purify the oil. Therefore, there is a problem in that oil purification is not performed when the vehicle frequently stops at traffic lights during normal driving, or when the vehicle is stagnant and so-called slow driving, and the performance of the electrostatic filter is substantially reduced.

Therefore, an object of the present invention is to provide an electrostatic filter that does not deteriorate in performance as described above and is free from the risk of electric shock during replacement.

When replacing the electrostatic filter, it is necessary to ensure that the high voltage generator is stopped.

By the way, the electrical devices of a vehicle are generally turned on and off in conjunction with the ignition switch, which starts and stops the engine, and the operation of the high voltage generator is also generally done in conjunction with the ignition switch. be. However, the ignition switch is often left on even when the engine is stopped. In other words, if you turn on the ignition key after stopping the engine,
Another example is when the engine stalls, even though the ignition switch is turned on. In such cases, general users or maintenance personnel should visually check that the engine has stopped, and
Naturally, there is a risk that the ignition switch will be mistakenly turned off and the electrostatic filter will be replaced.

The present invention provides an electrostatic filter that is completely free from this risk, and includes a relay between the high-voltage generator and the battery that opens the contact when the engine is stopped and stops the power supply to the high-voltage generator. It is characterized by The relay may be operated by, for example, interlocking the relay with a hydraulic switch provided in the oil flow path to detect a drop in oil pressure due to engine stoppage.

According to the present invention, the filter can be safely replaced and inspected when the engine is stopped, regardless of whether the ignition switch is turned on or off. Furthermore, in the present invention, oil purification is performed whenever oil purification is required, that is, while the engine is in operation, so that the efficiency of the filter is not reduced. In addition, inspections can be carried out safely even when the ignition switch is turned on and the engine is stopped, such as in the event of an accident.

The present invention will be explained below with reference to the illustrated embodiments.

FIG. 1 shows a system diagram of an electrostatic filter equipped with the current-carrying circuit of the present invention. In the figure, 1 is an electrostatic filter, 2 is a high voltage generator, 3 is a battery, and 5 is an ignition switch.

The oil in the oil passage 7 circulates in the direction of the arrow in the figure and reaches each lubricating part, but a part of it reaches the electrostatic filter 1 through a branch pipe 7a branched midway. A throttle 9 for pressure reduction is provided in the branch pipe 7a. The electrostatic filter 1 is a cartridge type, and has a branch pipe 7.
Filter 1 mounting adapter 7 provided in the middle of a
It is screwed into b. An oil supply/discharge path for the filter 1 is formed in the adapter 7b. A filter member is arranged between the electrode plates in the electrostatic filter 1, and when an electric field is formed between the electrode plates, the negatively charged carbon particles in the oil are attracted to the anode side, and the above-mentioned Collected by the filter member.

Now, a hydraulic switch 4 is installed on the side wall of the oil flow path 7 with a pressure detection part exposed in the oil. The contact of this hydraulic switch 4 closes when the oil pressure decreases. On the other hand, a relay 6 is provided between the high voltage generator 2 and the battery 3, and one end of the coil 6b is grounded to the main body of the hydraulic switch 4 via the contact point of the hydraulic switch 4, and the other end is connected to the ignition switch. 5 to the positive electrode of the battery 3. The other end of the coil 6b is also connected to one end of the normally closed contact 6a of the relay 6. The other end of the normally closed contact 6a is the high voltage power supply generator 2
It is connected to the input section of The output part of the high voltage power supply 2 and the electrostatic filter 1 are connected by a high tension cord 8, and the connection between the cord 8 and the filter 1 is made by connecting a socket 8 to a plug (not shown) provided on the main body of the filter 1.
This is done by crowning a.

The operation of the energizing circuit having the above configuration will be explained below.

When the engine is started, the ignition switch 5 is conductive, and when the engine is started, the oil pressure increases and the contact of the hydraulic switch 4 is opened. In this state, coil 6b of relay 6
Since is not energized, the battery 3 power is supplied to the high voltage generator 2 via the normally closed contact of the relay 6, and the generated high voltage is applied between the electrodes of the filter 1 via the high tension cord 8. The carbon particles in the oil are collected.

When the engine is stopped to replace the filter or inspect the inside of the engine room, the oil pressure decreases, and this is detected and the contact of the hydraulic switch 4 closes. At this point, if the ignition switch 5 is not completely turned to the OFF position and the switch 5 is in a conductive state, the coil 6b of the relay 6 is excited by the battery 3 power supply, and the normally closed contact 6a of the relay 6 is opened. Then, the supply of power from the battery 3 to the high voltage generator 2 is cut off.

As described above, even when the ignition switch is in a conductive state, the current supply circuit of the present invention detects the drop in oil pressure due to engine stoppage and activates the relay, thereby reducing the battery and high voltage generator. Since the connection between the two is cut off, there is no need to check whether the ignition switch is closed or disconnected when replacing the electrostatic filter or inspecting the engine compartment.

FIG. 2 shows another embodiment of the present invention, in which a vacuum switch 11 is connected to a vacuum pipe 12 leading to a vacuum brake booster.
and operate the relay 6 at the contact point,
The connection between the battery 3 and the high voltage generator 2 is cut off. In the figure, numeral 10 denotes a vacuum pump linked to the engine, which evacuates the brake booster through a vacuum pipe 12 in the direction of the arrow in the figure.

When the engine stops, the vacuum pump 10 stops rotating, and the pressure in the vacuum piping 12 is restored. This closes the contact of the vacuum switch 11, energizes the coil 6b of the relay 6 connected to it, and opens the normally closed contact 6a, cutting off the supply of battery 3 power to the high voltage generator 2. It will be done.

This embodiment also produces effects similar to those of the previous embodiment.

As mentioned above, the energizing circuit of the present invention has a contact point between the battery and the high voltage generator, and the contact point is opened in response to an engine stop signal. When replacing or inspecting the engine room,
There is no need to constantly check whether the ignition switch has been turned off, which improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are both diagrams showing an embodiment of the energizing circuit for an electrostatic filter of the present invention. 1... Electrostatic filter, 2... High voltage generator, 3
... Battery, 4 ... Oil pressure switch, 6 ... Relay, 7 ... Oil flow path, 7a ... Branch pipe of oil flow path, 10 ... Vacuum pump, 11 ... Vacuum switch.

Claims (1)

[Scope of utility model registration request] An anode plate and a cathode are arranged to face each other in the oil flow path of an automobile, and a high voltage is applied between the electrode plates to form an electrostatic field to collect carbon particles in the oil. In this type of electrostatic filter, a high voltage generator that supplies high voltage to the filter is interposed between the filter and the battery, and a contact is opened between the high voltage generator and the battery to generate high voltage when the engine is stopped. An energizing circuit for an electrostatic filter, characterized in that it is equipped with a relay that stops power supply to a voltage generator.