JPS6143274A - Control of internal combustion engine - 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] [Field of Industrial Application] The present invention relates to a method for controlling an internal combustion engine, and more specifically, a method for controlling an internal combustion engine. The present invention relates to a method for controlling an internal combustion engine using a heat generating section having a resistance that limits the energy supply of the internal combustion engine.

[Prior Art] DE 28 29 700 A1 describes a method for shortening the preheating time of a heat generating part of an internal combustion engine, for example a glow plug. In this method, the resistor that limits the current flowing through the glow plug is not short-circuited only when the starter is activated, but already short-circuited a short time after the glow plug is turned on. Therefore, in the conventional method, the short circuit of the limiting resistor is controlled to a predetermined rotation point.

[Problems to be Solved by the Invention] Therefore, it is impossible to control the temperature of the glow plug with such conventional methods. This is because fluctuations in the voltage supplied to the entire device are not taken into account.

Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide a control method for an internal combustion engine that can accurately control the temperature of a heat generating part such as a glow plug.

Means for Solving Problem E] In order to solve these problems, the present invention adopts a configuration in which a resistor that is connected in series with the heat generating part and limits the energy supply to the heat generating part is short-circuited by clock operation. did.

[Embodiments] Next, the present invention will be described in detail with reference to embodiments shown in the drawings. The following description will be made using a diesel internal combustion engine as an example in which fuel ignition and combustion are controlled by a glow plug placed in a combustion chamber of the internal combustion engine. However, the present invention is not limited to this, and can also be used to control an internal combustion engine using a heat generating section disposed in a combustion chamber of the internal combustion engine.

FIG. 1 shows a first embodiment of the method according to the invention. In FIG. 1, the reference numeral 30 indicates a heat generating part disposed in a combustion chamber of an internal combustion engine, such as a glow plug. One terminal of the glow plug 30 is connected to ground, and the other terminal is connected to a resistor 31 and a switch 33.

Further, a switch 34 is connected to the resistor 31. The other terminals of both switches 33, 34 are respectively connected to the supply voltage U. In FIG. 1, a control device designated 32 is used. A signal T indicating the temperature of the glow plug 30 is input to the control device 32, and a power supply voltage Us, for example, is input to the control device 32.
An operating amount characterizing the driving state of the internal combustion engine is input.

This amount of movement can be determined, for example, by direct measurement or by indirect calculation. The control device 32 generates output signals A and B based on the input signals, and the signal A drives the switch 33 and the signal B drives the switch 34, respectively.

When the internal combustion engine is put into operation, an attempt is first made to heat the glow plug to its operating point as quickly as possible. This is done, for example, by closing the switch 33 to short-circuit the resistor 31, thereby applying the supply voltage U to the glow plug 30 from the moment it is turned on. It is also conceivable to release the volume switches 33, 34 after a predetermined time has elapsed, but with the device of the invention it is also possible to adjust the temperature of the glow plug to a predetermined value. This is, for example, the control device 3
Input the signal T regarding the temperature of the glow plug 30 into 2,
This is done by operating both switches 33 and 34 accordingly to control the amount of energy supplied to the glow plug 30 to the amount necessary to maintain the temperature of the glow plug 30 at a predetermined value. In this case, it is preferable to take into account not only the temperature signal T regarding the glow plug 30 but also the operating quantity characterizing the operating state of the internal combustion engine. For example, switch 33.
When generating signals A and B for driving 34, the power supply voltage U
By taking the day into account, it is possible to compensate for the decrease in the power supply voltage at an earlier point in time when controlling the temperature of the glow plug 30. In particular, in the embodiment illustrated in FIG. 1, a switch 33 is used to short-circuit the resistor 31. When the switch 34 is closed, the energy supply to the glow plug 30 is at its maximum value or is limited by the resistor 31 under the control of the switch 33 . By setting the resistor 31 to an appropriate value, the glow plug 30 generated by turning on and off both switches 33 and 34
It is possible to limit the amount of energy supply fluctuation to a minimum value. When driving a car equipped with glow plugs, it has been found that, for example, in order to avoid fluctuations in the brightness of the car's headlights, the fluctuation range of the energy supplied to the glow plugs must be kept below a predetermined value. .

In the embodiment shown in FIG. 1, it is thus possible to short-circuit the resistor 31 by means of the switch 33 in a clocked manner. Similarly, in this embodiment, the connection with the resistor 31 can be cut off based on the clock.

The clocking of the switches 33, 34 then takes place taking into account the temperature of the glow plug 30.

Similarly, it is also possible to control the clock driving of the switches 33 and 34 so that fluctuations in the amount of energy supplied to the glow plug 30 are minimized.

The method of the invention as illustrated in FIG. 1 is not limited to a predetermined point in time, such as before or during starting of the internal combustion engine, but can also be used while the internal combustion engine is running. be.

FIG. 2 shows a second embodiment of the present invention, in which the parts shown in FIG. 1 are designated by the same reference numerals and their explanations will be omitted. The difference between the same embodiments is that the switch 34 in the first embodiment is replaced by the resistor 31 and the switch 3 in the second embodiment.
3 is connected outside the parallel circuit. That is, the second
In the illustrated embodiment, the resistor 31 and the switch 33 are connected directly to the supply voltage U, and the switch 34 is connected to the other terminal of the resistor 31 and the switch 33.

The switch 34 and glow plug 30 are connected in series and connected to ground. In the embodiment of FIG. 2, the control device 32
A temperature signal T and other operating quantities characterizing the operation of the internal combustion engine are input to the input terminal . Control device 3 according to these input signals
2 generates signals A and B for switching switches 33 and 34.

Also in the embodiment shown in FIG. 2, the resistor 31 is short-circuited by the switch 33, and the connection with the resistor 31 is cut off by the switch 34. This makes it possible to control the amount of energy supplied to the glow plug 30 via the switches 33 and 34. This control is performed in consideration of the temperature of the glow plug 30 and, in some cases, the value of the power supply voltage UB. In that case, another thing to consider is to set the switch 33 so that the fluctuation range of the amount of energy supplied to the glow plug 30 is below a predetermined value.
．． 34.

In the embodiments shown in Figs. 1 and 2, the switches 33 and 34 are not controlled only once, but the switches 33 and 34 are turned on and off by clock operation according to the temperature of the heat generating part, the range of variation in energy supply to the heat generating part, etc. Ru. So-Sho-Joint Switch 3
3.34 can be driven independently of each other with different clock times and with different clock lengths, but it is also possible to clock both switches in conjunction with each other. Examples of both switches 33 and 34 include electronic switches, but they can also be configured with electromagnetic relays or the like.

Which embodiment of the invention is used and both switches 33.3
How 4 is driven depends on the usage example and the requirements imposed thereon, and can be determined in response to the usage example.

[Effects] As explained above, according to the present invention, the resistor that is connected in series with the heat-generating part and limits the energy supply to the heat-generating part is short-circuited by clock operation, so the temperature of the heat-generating part can be extremely reduced. It becomes possible to control accurately.

[Brief explanation of the drawing]

FIGS. 1 and 2 are circuit configuration diagrams of different embodiments implementing the method of the present invention, respectively.

Claims (1)

[Claims] 1) A heat generating part arranged in a combustion chamber of an internal combustion engine, and a resistance connected in series with the heat generating part to limit energy supply to the heat generating part, and controlling the internal combustion engine by the heat generating part. A method for controlling an internal combustion engine, characterized in that the resistor is short-circuited by a clock operation. 2) A method for controlling an internal combustion engine according to claim 1, wherein the resistor is cut off from energy supply by clock operation. 3) A method for controlling an internal combustion engine according to claim 1, wherein the heat generating section is cut off from energy supply by clock operation. 4) A method for controlling an internal combustion engine according to claim 1, 2 or 3, wherein the clock is changed according to the temperature of the heat generating part. 5) A method for controlling an internal combustion engine according to claim 1, 2, or 3, wherein the clock is changed in accordance with the variation range of energy supply to the heat generating section. 6) A method for controlling an internal combustion engine according to any one of claims 1 to 5, wherein the clock is operated only when the internal combustion engine is operating.