JPS58124028A - Fuel injection control device for multicylinder internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent a danger arising from the stoppage of the titled engine on a superhighway or a mountain road in winter by a method wherein the mode of an operative injection device through the control device having abnormality information inputted from various kinds of sensors is switched so that the operation of the engine is kept continued by each cylinder of the engine. CONSTITUTION:When the shortcircuiting of a signal line to an electromagnetic valve, the failure of the output stage of the control device or the abnormality of the pressure of a pressure source takes place during the normal operation of the engine, the quantity of fuel injection increases excessively so that it is hardly controlled. In this case, a computer 4 recognizes the above condition accurately according to information concerning the crank angle, the exhaust gas temperature, the exhaust gas emission and the like and informs the operator of the abnormal condition by switching the operation condition of the engine to an accident mode so as to operate the engine safely in the minimum possible range. For example, when the sixth cylinder goes out of order due to an unusual increase in the quantity of fuel injection, the supply of electric current to the cylinder is cut to stop the operation of the cylinder and in order to balance the engine, the fourth and the fifth cylinder are also stopped while the operation of the engine is kept continued. In this case, the output of the engine reduces to half and therefore, the quantity of fuel injection for the first to the third cylinder may be increased, if necessary and when conditions permit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection control device for a multi-cylinder internal combustion engine, particularly a diesel engine, and more particularly to an electronically controlled fuel injection control table imK provided with a fuel injection device for each cylinder.

In the fuel injection control device for a multi-cylinder internal combustion engine, a fuel injection control device for a multi-cylinder internal combustion engine uses an electric actuator to inject fuel into each cylinder. However, for example, when a failure occurs in the metering system of the fuel injection device and the injection amount becomes uncontrollable, the engine The fuel will overrun, creating an extremely dangerous situation.There is no mechanism to prevent this from happening.Furthermore, if a failure occurs that suddenly stops injection to a certain cylinder, the balance of the engine cannot be maintained and abnormal vibrations occur. However, this cannot be prevented either.

In particular, if the above-mentioned metering system failure caused the engine to become uncontrollable due to an increase in the amount of ejection, the engine would overrun, potentially endangering human life. In particular, even electronic control units with computers had a safety function that stopped injection and stopped engine operation in the event of a failure. It's not suitable. In other words, if this failure occurs while driving on a highway, on a mountain road in winter, over rare remains of human habitation, or if the engine is being used as a power source for hydraulic equipment for working hydraulic equipment, the engine will stop operating. In particular, this may cause a secondary danger.Therefore, even if a breakdown occurs, do not stop driving until you reach a safe location without stopping the 4!L! The thing to do is the electrical equipment.

An object of the present invention is to provide fuel injection for a multi-cylinder internal combustion engine that allows engine operation to continue in a failure mode without stopping engine operation even if an abnormality occurs in the injection of the fuel injection device of any cylinder. The purpose of the present invention is to provide a control device.

In the present invention, for each fuel injection device provided for each cylinder, the control device determines whether there is an abnormality in fuel injection based on detection data from a sensor that detects the operating state of the engine, and When it is determined that there is an abnormality in the fuel injection device, the control device supplies a control electric signal to the fuel injection device of each cylinder in a control mode different from that during normal operation, and starts operating the engine. Make it continue.

In this control mode, which is different from normal operation, for example, a control signal is sent to a fuel injection device that has caused an abnormality to stop fuel injection, and a control signal is sent to the fuel injection device that has caused the problem. Supplying a control signal to stop fuel injection IR or reduce the number of fuel injections to the fuel injection device of at least one other cylinder in a specific arrangement order relationship in view of the balance between arrangement order and output redundancy. do.

Therefore, in the past, if the fuel injection device of any cylinder became abnormal, engine operation had to be stopped, but in the present invention, a control signal of a control mode different from that during normal operation is sent. By supplying fuel to each cylinder's fuel injection system, the operating performance of one engine will be lower than normal operation, but operation can continue without damage to the engine due to abnormal vibrations caused by unbalanced output between each cylinder of the engine. . Therefore, it is possible to prevent various dangers due to engine operation stoppage on expressways, mountain roads in winter, etc., and to reduce the number of safety IfM wrinkles.

An embodiment of the present invention will be described with reference to Figure @J.

Diagram M1 shows an electronically controlled hydraulically driven diesel fuel injection device (as an example of a fuel injection device for each cylinder in the present invention).
1 cylinder).

In Fig. 1, 1 is an injector, 2 is a high pressure source, and 3
is a low-pressure pressure source, 4 is a control device t comprehensively 7Je. Injector 1 includes spool valve 5, plunger 8, piston 9, nozzle 1o and #1.2.6 #L low jf11.1
2.13 The throttle valve 22, the check valve 24 and the pressure source 2.3 are connected to the bonder 201.301 and the relief valves 202 and 3.
02, filter 203.303, pressure accumulator 204.304
It consists of a normal constant pressure source. Further, the control device 4 is connected to various sensors (not shown) and to the three electric cells 11, 12, and 13.

Figure 2-1 is an embodiment of a six-cylinder engine using a fuel injection control device according to the present invention. The engine 100 includes a spool valve 5 shown in FIG. Plunger 8. Fuel injection system filt that includes the piston 9, nozzle 10, solenoid valve 11, 12, 13, etc.
1 is installed in the tower, and engine 1o is installed.

is equipped with sensors for crank angle, water temperature, etc., and is connected to the control device t4. On the other hand, the hydraulic source 2 shown in Figure 1
．． The pressure piping from 3 is connected to each fuel injection device 1 and is also connected to an installed pressure casing/sugar control beating device 4. The control device 4 mainly uses a microcomputer to detect the electromagnetic valve drive circuit and perform control according to a program. The control rack @4 is capable of independently controlling the fuel injection device 1 of each cylinder. Furthermore, with the recent development of microcomputers, various types of arithmetic processing have become obsolete, and by using this, it is possible to independently control not only each cylinder but also the injection itself each time in each cylinder.

To describe the operation, a side control signal is output from the control device 4 to the solenoid valves 11, 12, and 13 according to information from each extraction sensor. A solenoid valve 11 , 12 operates the spool valve 5 , which controls the hydraulic pressure applied to the piston 9 which drives the plunger 8 . The plunger 8 piston 9 receives hydraulic pressure supplied from the pressure source 2, and injects fuel from the nozzle 10. The injection amount is controlled by opening and closing the solenoid valve 13 according to the air pressure control signal calculated and output by the control frame &4, and in the state shown in Fig. 1 (plunger 8 and piston 9 are raised), the injected fuel is sent to the lower part of the syringer 8. This is done by controlling the amount of time this solenoid valve 13 is open.

At this time, a condenser 22 is provided in order to reduce the increase rate of the ejected j knowledge with respect to time. Since the injection device shown here as an example is already known and its operation is well known, further detailed explanation will be omitted.

Next, the main focus of the present invention is safety when an injection abnormality occurs (p N
To explain u, during normal passing as described above, for example, if the solenoid valve 13 remains open and cannot be reset, or if the shedding 22 falls off, or if the signal line of the solenoid valve 13 falls off. If a short circuit or abnormal pressure occurs in the control device output stage, the number of injections will increase and the control will be in trouble.As mentioned above, this will lead to engine overrun and an extremely dangerous phenomenon. The risk is particularly high when there is a failure in the city control system that affects all six cylinders.

Such a state can be properly recognized by the computer based on information from each of the above-mentioned sensors, such as back crank angle, exhaust temperature, and exhaust emissions. Furthermore, whether or not the pB wave emitter abnormality occurs can be determined based on the fluctuation of the engine speed corresponding to the combustion timing of each cylinder. Therefore, the computer of the control device 14 switches the operating conditions to a failure mode and safely continues the minimum amount of operation while notifying the driver of the failure.

Now, to explain the failure mode operation in more detail, with the configuration of the present invention, each cylinder and each injection can be independently and freely controlled as described above, which is a huge %iii!
I have L. When a failure occurs, the number of failed cylinders is 1.
When there is only one injector, such as only books, JdU, if there is only one injector with an abnormal injection, only the faulty cylinder is stopped, and depending on the mechanical and thermal balance of the engine, injection is also stopped in the necessary cylinders. &Make the injection stop intermittently. Furthermore, in order to secure the required torque for one engine as a whole, it is possible to increase or decrease the injection amount in other operating cylinders. In the event of a failure involving all cylinders, the number of cylinders to be operated is determined based on machine output, and the other cylinders are stopped to achieve the effect of reducing the injection amount as a whole.

At this time, the position of the operating cylinder may be changed over time in consideration of mechanical and thermal balance. This is ft per valley injection
I mentioned earlier what you can do with ttl. In this case also M11
As mentioned earlier, the selection of air pressure to maintain balance in the event of a breakdown depends on the number of cylinders, the arrangement of the cylinders, the number of auxiliary engines in the engine, and other parameters. Adding leverage is ``Ko'TM Bi''.

FIG. 3 is a flowchart showing the flow of this control. Particular attention should be paid here to the fact that these controls μII are repeated from time to time, and as a result, the conditions can be changed for each injection, as described above.

Next, to explain in more detail using a timing diagram, FIG. 4 shows a well-known injection device 1 (injector).
FIG. b.: Kararekaru 11! Three Kangen valve signals are output by X shot. Here, the timing of the engine rotation for one injection is shown in FIG. 5. Here, what is shown by A in the figure is one injection per cylinder for a moment. In the example 1-5-3-
This is a 6-cylinder engine that explodes in the 6-2-4 order.

Here, as an example, we will discuss failure mode operation when the 6th cylinder fails due to an abnormally large injection amount. Figure 6 is an example of failure mode operation. Stop operation. Furthermore, in order to balance the organization, the fourth. The fifth cylinder also stops operating and continues continuous rotation.

Here, since the output is '/2, the injection amount for the 1, 2, and 6 cylinders may be increased if necessary and conditions permit.

An example of operation in another mode is shown in FIG. In this example, the faulty 6th cylinder stops injection, and the 4.5th cylinder operates at a reduced speed to reduce the number of injections. That is, the fourth cylinder explodes (fuel injection) every other time, and the fifth cylinder explodes every third time. This example is an intermediate operation between the normal continuous operation and the 61st example.

As another example of a failure mode, in order to more effectively deal with a relatively minor case where the throttle cylinder 22 is only loosened, a faulty cylinder is set.

It is also possible to add a method to shorten the standing time (the running time of the solenoid valve 13 in FIG. 4CD).

In addition, in the failure mode of the embodiment, it is possible to adjust the number of cylinders by 1f or operate all A stations while adjusting the time, and of course it is also possible to mix 1 car-f. ” It is Noh. The most suitable pattern should be selected for these failure events depending on the target engine, how the engine is used, and the failure situation.

The failure mode F in the metering system described in the above embodiment is caused by the injection control system (in the embodiment shown in the figure, the spool valve 5 and the plunger 8).
, piston 9 electric valve 11, 12 pressure source 2, Ra' 1 discharge device 1lt4, etc.) are abnormal and cannot inject normally, by adding a discrimination algorithm). You can see that it works just by applying it. That is, it is possible to prevent the engine from becoming unbalanced due to stopping the failed cylinder, and to continue safe operation. However, in this case, if there is a failure in all A cylinders, that is, if all A cylinders cannot be injected easily, it is not θ for external use, so it is safe to say -eE'sK.

It can be seen from the above that it is possible to switch to the appropriate failure mode energization for all the failures of the injection equipment and to continue the VC operation.

The injection device shown as an example is the simplest one that uses fuel as the hydraulic fluid in a hydraulic system. It goes without saying that the present invention can be applied even if the position and piping are changed, and the configuration of the injection device 1 itself may also be different from that shown in the drawings.

In addition, although a microcomputer is used as the control device in the embodiment, if conditions permit, such as in low-speed engines, it is possible to configure this with an analog circuit, or conversely, it is also possible to use a multiprocessor system. It is.

Furthermore, failure modes are not limited to one pattern;
It is also effective to switch appropriate modes or to equip a combination sensor or the like and control them together.

The present invention has a control device that inputs information from each Maki sensor and outputs an actuator signal, and an injection device for each cylinder that can be operated independently. When a situation is about to occur, the control g4) device recognizes this and switches to continuous mode, thereby stopping the engine with the part that cannot be measured in the event of a failure of the first line, for example. It has the effect of making it easier to drive safely.

[Brief explanation of the drawing]

Figure 1 shows a diagram of the fuel injection device used in the embodiment of the present invention.
The figure which shows the example of a model structure for cylinders. The second part is implementation of a fuel injection control system for a six-cylinder engine.
．． One figure showing, No. 6i! ! ! What about J? l] 1111&ll's flowchart. Figure 4 shows the fuel injection system for one injection.
The timing diagram of the operation of the spool, etc., the fifth figure is the timing diagram at Masatomi regarding the control signal of the 6-A cylinder engine, and the sixth figure and the seventh figure are the timing diagram of the control signal of the 6-cylinder engine.
FIG. 3 is a timing diagram of knee-yard operation. In the figure, 1...Fuel injection device, 2.3...Pressure source, 4...
Control device, 5... Spool valve, 8... Plunger,
9... Piston, 10... Nozzle, 11.12.1
3..."If solenoid valve, 100...engine. Agents: Asamura and 4 people.

Claims (1)

[Scope of Claims] (1) A fuel injection device installed in each cylinder that can control multi-fuel injection using an electric signal, a sensor that detects an idle operating state, and a fuel injection device that can control multiple fuel injections based on the operating state of the engine detected by the sensor. The fault of the fuel injection abnormality in the fuel injection system for each fuel injection system is determined, and when it is determined that it is a malfunction in the fuel injection system of any cylinder, it is determined that the abnormality of the fuel injection is necessary for continued operation of the engine. A system different from #
1^) A fuel injection control device for an internal combustion engine, comprising a control device that supplies one electric signal to a fuel injection device for each cylinder. (2. The device according to claim 1, wherein the control device is a fuel injection device in which an abnormality has occurred, and a specific arrangement based on the arrangement order of the cylinders related to the fuel injection device and the balance of output generation. A fuel injection control device for a multi-cylinder internal combustion engine that supplies a control electric signal to stop injection at the fuel cylinder -tI' to the fuel injector of at least one cylinder, regardless of the ranking relationship. The device according to claim M1, wherein the control device supplies a control 11 electric signal to stop fuel injection to a fuel injection device in which an abnormality has occurred, and also controls a cylinder to which the fuel injection device relates. In order to balance the arrangement order and output generation, a control system that reduces the number of fuel injections for at least one cylinder in a specific arrangement order r@.
A fuel injection control device for a multi-cylinder internal combustion engine that supplies air signals. (4) The device according to claim 1, wherein the control device supplies a control signal that changes the control conditions of the metering system in the fuel injection device in which the abnormality has occurred and reduces the amount of fuel injected each time. A fuel injection control device for multi-cylinder internal combustion engines. (5) The device according to claim 2 or 3, wherein the control device is arranged in a specific arrangement order relationship between the cylinders related to one of the fuel injection devices in which the abnormality has occurred and the balance of output generation. A fuel injection control device for a multi-cylinder internal combustion engine, wherein a fuel injection device for stopping fuel injection or reducing the number of injections receives a control signal that changes sequentially according to a predetermined order. (b1@Hyukomizu Range $1 to 5), and the fuel injection device in which the above abnormality has occurred is a fuel injection control device for a multi-cylinder internal combustion engine in which the metering system is abnormal. ( 71Special W#*Ice range The fuel injection device in which the above-mentioned abnormality has occurred is a fuel injection device for a multi-cylinder internal combustion engine that has an abnormality in its injection operation system. Simple control device.