KR100384142B1 - Fuel injection time control device - Google Patents

Abstract

The present invention relates to a fuel injection timing control device,

Conventional fuel injection timing controllers have to install inlet and outlet pipes for supplying the coolant to the wax because the wax expands / contracts in contact with the coolant, and for this reason, the material cost of the product is increased and the complexity of the structure is increased. Productivity decreases, and as the driving timing rod is driven depending on the shrinkage or expansion force of the wax, not only the high expandable material of the wax needs to be used for sufficient advancement, but also the housing in which the wax is installed must be large. There was a problem that the size of the larger.

Therefore, the present invention for solving the above problems is connected to the injection timing adjusting rod for adjusting the fuel injection timing of the diesel engine as a wire, a thermo valve for selectively supplying the vacuum pressure to the diaphragm according to the coolant temperature of the engine By forming a vacuum so that the vacuum pressure is supplied to the diaphragm during cold start so that the injection timing adjustment rod is pulled in the forward direction, so that the fuel injection timing is advanced during cold start, and the engine ignition operation is smoothly performed. The present invention relates to a fuel injection timing control device that can simplify the configuration of the fuel cell and improve the productivity and reduce the cost.

Description

Fuel injection time control device

The present invention relates to a fuel injection timing control device, in particular, to advance the fuel injection timing during cold start to facilitate the engine ignition operation, and to simplify the configuration of the fuel injection timing control device to improve productivity and reduce costs It relates to a fuel injection timing control that can be expected.

In general, a diesel engine has a disadvantage of poor startability at low temperature, and in order to improve this, a fuel injection timing control device for advancing a certain amount of time of injection of fuel injected into an engine at low temperature is provided.

1 shows a conventional fuel injection timing control device,

The injection timing adjusting rod 2 for adjusting the fuel injection timing of the diesel engine is coupled to a separate rotor 1, and a wire 4 is connected to the tip of the injection timing adjusting rod 2, and the wire ( The end of 4) is connected to the wax 5 which is filled inside the housing 5.

The injection timing adjustment rod (2) is formed with a return spring (3) for rotating the injection timing adjustment rod (2) in the forward direction to restore to the original position.

The wax 5 shrinks or expands according to the temperature of the cooling water. The wax 5 is formed in a separate housing 5, and the housing 5 has an inlet tube 7 for inflow of the cooling water. A discharge pipe 8 for discharging the cooling water is formed.

Therefore, during cold startup, since the temperature of the coolant flowing into the inlet pipe 7 is low, the wax 5 in contact with the coolant contracts and pulls the wire 4, thereby connecting the wire 4. As the injection timing adjusting rod 2 is rotated to the advance side, the fuel injection timing of the diesel engine is advanced and the cold start is smoothly performed.

However, in the conventional fuel injection timing control device, since the wax expands / contracts in contact with the coolant, the inlet and outlet pipes for supplying the coolant to the wax must be installed, respectively. Productivity decreases, and depending on the shrinkage or expansion force of the wax, it is necessary to use the highly expandable material of the wax as well as the housing in which the wax is installed for sufficient advancement as the jet timing rod is driven. There was a problem that the size of the overall product increases.

Therefore, the present invention for solving the above problems is connected to the injection timing adjusting rod for adjusting the fuel injection timing of the diesel engine as a wire, a thermo valve for selectively supplying the vacuum pressure to the diaphragm according to the coolant temperature of the engine By forming a vacuum so that the vacuum pressure is supplied to the diaphragm during cold start so that the injection timing adjustment rod is pulled in the forward direction, so that the fuel injection timing is advanced during cold start, and the engine ignition operation is smoothly performed. It is an object of the present invention to provide a fuel injection timing control device capable of simplifying the construction of the fuel cell and improving the productivity and cost.

1 is a view showing a conventional fuel injection timing control device.

2 is a view showing a fuel injection timing control device of the present invention.

3 is a view showing an operating state of the present invention.

Figure 4 shows the vacuum pressure applied to the diaphragm according to the temperature change by the present invention

Graph,

※ Explanation of symbols for main parts of drawing

1: rotating shaft 2: injection timing adjustment rod

3: return spring 4: wire

10: diaphragm 10a: case

11: vacuum pipe 12: thermo valve

13 cylinder head 20 housing

21: wax 22: valve body

23: spring

2 to 4 show the fuel injection timing control device of the present invention for achieving the above object, it will be described with reference to the drawings the preferred embodiment of the present invention.

The present invention,

In that the injection timing adjusting rod (2) for adjusting the fuel injection timing of the diesel engine is coupled to a separate rotor (1),

A diaphragm 10 installed in a separate case 10a and connected by the injection timing adjusting rod 2 and a separate wire 3 and contracting or expanding according to whether vacuum pressure is supplied;

A vacuum pipe 11 connecting the case 10a and a vacuum pump;

A thermo valve (12) installed in the middle of the vacuum pipe (11) to open and close according to the temperature change of the cooling water so that the vacuum pressure of the vacuum pump is selectively supplied to the case (10a); It is configured to include.

And, the thermo valve 12 is pressed into one side of the cylinder head 13, the middle portion of the housing 20, the through-hole 20a for connecting the vacuum pipe 11 is formed on both sides;

A wax 21 installed inside the housing 20 and contracting or expanding according to a temperature of cooling water circulating inside the cylinder head;

A valve body 22 installed at the movable end of the wax 21 to open and close the passage of the vacuum pipe 11 while moving in conjunction with the contraction / expansion of the wax 21;

A spring 23 installed between the valve body 22 and the housing 20 to apply elasticity in a direction in which the valve body 22 returns to its original position; It consists of.

Referring to the operation of the present invention configured as described above is as follows.

The temperature of the cooling water circulating inside the cylinder head 13 at the time of cold start becomes very low temperature, and this low temperature is transmitted as it is to the wax 21 which comprises the thermovalve 12 as it is.

The wax 21 is installed in the housing 20, which is press-fitted into the cylinder head 13 so as to approach the coolant as shown in FIG.

Therefore, the temperature of the cooling water circulating in the cylinder head 13 is transmitted to the wax 21 as it is, so that the wax 21 contracts, whereby the valve body 22 rises as shown in FIG. 3 to open the through hole 20a. By opening, the vacuum pipe 11 connecting the vacuum pump and the case 10a is opened.

When the vacuum pipe 11 is opened, the vacuum pressure applied by the vacuum pump is applied to the case 10a through the vacuum pipe 11, whereby the diaphragm 10 vertically installed in the case 10a is advanced. In the direction (right side of the drawing).

The wire 4 is pulled by the expansion of the diaphragm 10, and the fuel injection timing of the diesel engine is advanced as the injection timing adjusting rod 2 connected to the end of the wire 4 is pulled in the forward direction. It is controlled.

As described above, when the engine is driven for a predetermined time while the fuel injection timing is controlled in advance, the temperature of the cooling water circulating in the cylinder head gradually rises, and the increase in temperature is transmitted to the wax 21 as it is.

The wax 21 gradually expands as the temperature of the cooling water rises and pushes the valve body 22 downward in the drawing, whereby the valve body 22 overcomes the elasticity of the spring 23 and descends, thereby allowing the opening 20a. ), The vacuum pressure of the vacuum pump is no longer transmitted to the diaphragm 10.

Therefore, the diaphragm 10 is returned to its original state as shown in FIG. 2, and the injection timing adjusting rod 2 connected to the diaphragm 10 and the wire 4 is returned to its original state by the elasticity of the return spring 3. As a result, the fuel injection timing of the diesel engine is restored to its normal state.

Wax 21 applied to the present invention as described above is preferably used to shrink or expand by about 1mm when the temperature changes by 10 ℃.

According to the present invention, the diaphragm 10 is connected to the injection timing adjusting rod 2 so that the rotation of the injection timing adjusting rod 2 does not directly depend on the contraction or expansion force of the wax 21. Since it is dependent on the expansion force, only the size of the diaphragm 10 needs to be adjusted when adjusting the amount of advancement of the injection timing adjusting rod 2, and the setting is easy. You can expect the effect of.

As described above, the present invention connects the injection timing adjusting rod for controlling the fuel injection timing of the diesel engine to the diaphragm and forms a thermo valve for selectively supplying the vacuum pressure to the diaphragm according to the coolant temperature of the engine. The vacuum pressure is supplied to the diaphragm during cold start so that the injection timing adjustment rod is pulled in the forward direction, so that the fuel injection timing is advanced during cold start, so that the engine ignition operation is smoothly performed, and the configuration of the fuel injection timing control device Simplification can be expected to provide a fuel injection timing control device that can be expected to increase productivity and reduce costs.

Claims (3)

In that the injection timing adjusting rod (2) for adjusting the fuel injection timing of the diesel engine is coupled to a separate rotor (1), A diaphragm 10 installed in a separate case 10a and connected by the injection timing adjusting rod 2 and a separate wire 3 and contracting or expanding according to whether vacuum pressure is supplied; A vacuum pipe 11 connecting the case 10a and a vacuum pump; It is press-fitted to one side of the cylinder head 13, the housing 20 is formed in both sides of the through hole 20a for connecting the vacuum pipe 11 in the middle portion, the cylinder head is installed in the housing 20 Wax 21 that contracts or expands in accordance with the temperature of the cooling water circulating therein, and is installed at the movable end of the wax 21, while moving in conjunction with the contraction / expansion operation of the wax 21, while the vacuum pipe 11 ) A valve body 22 for opening and closing a passage, and a spring 23 provided between the valve body 22 and the housing 20 to apply elasticity in a direction in which the valve body 22 returns to its original position. Thermo valve 12 to be opened and closed in accordance with the temperature change of the vacuum pump to selectively supply the vacuum pressure of the case (10a); Fuel injection timing control device characterized in that comprises a. delete The method of claim 1, The housing 20 of the thermo valve 12 is installed in the cylinder head 13, the fuel injection timing control device, characterized in that installed in the circulating portion.