JPS6034779Y2 - Device that facilitates engine starting in cold weather - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that facilitates starting of an engine in winter.

In an engine (for example, a car engine), even though the engine has already started, the pinion of the starter meshes with the gear on the engine side, causing the starter to rotate from the engine side instead, which is a so-called overrun, and the user does not realize that the engine has started. In order to prevent the so-called starter pinion from jumping in again when the starter is rotated again and the pinion attempts to mesh with the engine gear, the following electric circuit is provided.

That is, a starter protection relay is installed, the relay coil is connected to a generator attached to the engine, and a normally closed contact, which opens when the relay coil is energized, is inserted and connected between the starter relays via a key switch.

By doing this, when the engine starts, the relay coil of the protective relay is energized by the voltage generated by the generator at that time, the normally closed contact opens, and the current to the starter is cut off, eliminating the above problem. be able to.

By the way, when the engine is cold, it is difficult to start the engine, so it is necessary to pump a large amount of fuel into the cylinder, preheat it, and use the starter to keep the engine running until it reaches a certain number of revolutions.

However, in the protective relay installed to avoid overrun and re-jumping of the starter pinion, the voltage establishment rotation speed of the generator required to excite the relay coil is set lower than the idling rotation speed of the engine. In cold weather, the protection relay operates and stops the starter before the engine reaches its own speed, making it difficult to start the engine.

As mentioned above, the present invention was devised to solve the premature stoppage of the starter, which is one of the reasons why it is difficult to start the engine in cold weather. During this period, current is passed through the starter to allow the engine to rotate on its own.

To explain this in detail with the drawing, 1 is a key switch, which is equipped with a movable contact Ia, preheating contacts Ib and Ic, a starting contact Id, and other contacts (not shown) for accessories, for example. .

Reference numeral 2 denotes a preheater relay according to the present invention, which is mainly composed of a relay coil 3, and a normally open contact 4 and a normally closed contact 5 that are activated by excitation of the relay coil 3.

6 is the starter protection relay mentioned above, and relay coil 7
and a normally closed contact 8 that opens upon this excitation.

Note that 9 is a generator attached to the engine, and 10 is a battery.

Therefore, the electrical wiring of the present device first connects the movable contact Ia of the key switch 1 to the battery 10, and the preheating contact Ib of the switch 1 to a preheater (not shown) such as a glow plug or intake heater. At the same time, the wiring from the contact Ib to the preheater branches off and is connected to one end of the normally open contact 4 of the preheater relay 2 and one end of the relay coil 3 via the diode 11, respectively.

Note that 12 is a capacitor connected in parallel to the above-mentioned relay coil 3.

Next, the preheating contact Ic of the key switch 1 is connected to the other of the normally open contacts 4 of the preheater relay 2, and the starting contact Id is connected to one of the normally closed contacts 8 of the starter protection relay 6. The other of the closing contacts 8 is connected to a starter relay (not shown).

Further, one of the normally closed contacts 5 of the preheater relay 2 is connected to the generator 9, and the other is connected to one end of the relay coil 7 of the starter protection relay 6.

When it is desired to start an engine equipped with the device of the present invention configured as described above in cold weather, first, the movable contact Ia of the key switch 1 is brought into contact with the preheating contact Ib. It flows through to the preheater and directly preheats the engine, and also flows through the diode 11 to the relay coil 3 of the preheater relay 2 and the capacitor 12, closing the normally open contact 4 and simultaneously opening the normally closed contact 5.

Next, if the movable contact Ia is further rotated counterclockwise and brought into contact with the preheating contact Ic, or the starting contact Id, then the movable contact Ia is moved from the preheating contact Ib to the preheating contact Ic or the starting contact Id. Even when switching to contact Id, the discharge current of capacitor 12 maintains the excitation effect of relay coil 3, ensuring that the normally open contact 4 remains closed and the normally closed contact opens.)
, the current from the battery 10 to the preheater flows from the key switch 1 through the normally open contact 4 (closed) of the preheater relay 2 to continue preheating, and the diode 1
1 to the relay coil 3 and continues its excitation (self-holding), keeping the normally open contact 4 closed and the normally closed contact 5 open.

When the movable contact Ia contacts the preheating contact Ic and the starting contact Id, the preheater relay 2 operates as described above to continue preheating, and the battery current flows through the key switch 1 to the starter protection relay 6. The flow passes through the normally closed contact 8 (closed) to the starter and rotates the engine, but when the engine starts to run and reaches a considerable number of revolutions, the voltage generated by the generator 9 becomes the operating voltage of the relay coil 7 of the relay 6. Even if the engine temperature exceeds 1, the normally closed contact 5 of the preheater relay 2 is open, so the starter does not stop rotating and can continue to rotate sufficiently until the engine reaches its own rotation.

When the engine starts to rotate on its own, return the movable contact Ia of the key switch 1 to the position indicated by the solid line in the figure, and the relay coil 3 of the starter and preheater relay 2
The current to the preheater is then cut off, so that both the normally open and normally closed contacts 4.5 of the relay 2 are opened and closed, respectively.

Therefore, the generator current flows through the normally closed contact 5 to the relay coil 7 of the starter protection relay 6, and the normally closed contact 8
to cut off the current to the starter.

When preheating is not required, move the movable contact Ia of the key switch 1 directly to the starting contact I without placing it on the preheating contact Ib.
d, even if the movable contact Ia is the preheating contact I
Even if contact c, the capacitor 12 is hardly charged, so excitation of the relay coil 3 of the preheater relay 2 cannot be ensured, and the normally open and normally closed contacts 4 and 5 open and close, respectively. keep it.

Therefore, when the engine reaches a rotational speed sufficient for normal starting, the starter protection relay 6 is activated by the current from the generator 9.
The relay coil 7 is energized, the normally closed contact 8 is opened, and the starter's rotation is stopped.The normal protection function of the starter is carried out without any problem.

As mentioned above, the present device is equipped with a relay coil 3 connected via a diode 11 to a circuit directly leading from the key switch 1 to the preheater, and both normally open and normally closed contacts 4 and 5 operated by the coil. A preheater relay 2 is provided to form a circuit from the key switch 1 to the preheater via the normally open contact 4, and the normally closed contact 5 of the preheater relay 2 is connected to the generator 9 attached to the engine. Since the starter protection relay 6 is inserted and connected between the relay coil 7 and the normally closed contact 8 of the protection relay is arranged between the key switch 1 and the starter, the starter can be activated from the generator 9 using preheating operation in cold weather. Since the circuit leading to the relay coil 7 of the protective relay 6 is cut off and this state is maintained even when the starter is rotating, rotation by the starter can be continued until the engine reaches its own rotation, and the engine can be operated in cold weather. This has the effect of making starting easier, and starting operations that do not require preheating can also be performed without any problems.

[Brief explanation of the drawing]

The figure is a circuit diagram of the proposed device. 1...Key switch, 2...Preheater relay, 3...Relay coil, 4...
・Same normally open contact, 5... Normally closed contact, 6...
・Starter protection relay, 7... Relay coil, 8... Normally closed contact, 9... Generator, 10... Battery 11... ...Diode, 12...Capacitor.

Claims (1)

[Scope of utility model registration request] A relay coil connected via a diode to a circuit directly leading from the key switch to the preheater, and a preheater relay equipped with both normally open and normally closed contacts operated by the coil,
A circuit is formed from the key switch to the preheater via the above normally open contact, and the normally closed contact is inserted between the generator and the starter protection relay, and the normally closed contact of the protection relay is connected between the key switch and the starter relay. A device for facilitating engine starting in cold weather.