JPH03500672A - Injectors and ignition devices in fuel-injected spark ignition engines - 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] fuel injected spark ignition engine Injectors and igniters in The present invention relates to an injection and ignition system for a fuel-injected spark ignition engine. It is something that

The problem with the design of such engines is that they are constantly ° care should be taken to minimize the space available for accommodating the necessary components. .

Therefore, designers continue to look for ways to reduce the number of required components. problem The special parts are the ignition system and the fuel injection valve. Known engine design In this case, the ignition coil, spark plug and fuel injection valve are all separate components. It becomes basic. The general problem with this invention is to reduce the number of these elements to the greatest extent possible. It is to be accommodated in a small 7 pace.

One solution to this problem is a static ignition with one coil per cylinder. This was achieved using a device with a function. Combine ignition coil and spark plug into a single unit It has been proposed to combine within a set. Thus, one of such units One for each cylinder of the engine. This device requires a certain amount of space. Although it reduces the cost, the Sunokuichi plug should be converted relatively frequently. If so, the complexity increases and the spark plug is a unit with an ignition coil. If it forms a part of the won.

The present invention also allows the ignition timing signal to be used to control the opening and closing of fuel injection valves. It will be implemented in such a way that it will be carried out.

According to the invention, an electromechanical actuator including a coil for opening and closing the actuator is provided. Injecting fuel into the cylinder or intake manifold of an engine with In a pulp assembly for use in an internal combustion engine, the pulp assembly has pulp for The coil also acts as part of the engine ignition system. A structure can be provided.

The present invention can reduce the number of components in an engine ignition system. present invention In the preferred embodiment, the injection pulp actuator and engine ignition The ignition coil of the device has a common primary winding 2 and/or core. like this The injection pulp and ignition coil for internal combustion engines are separate units. That is, it can be manufactured as a pulp assembly according to the present invention.

As the number of coils required for injection and ignition decreases, the need for separate pieces to be connected increases. Because there are fewer separate components, less wiring is required when using the present invention. . As a result, the weight of the engine as a whole is reduced.

The pulp assembly of the present invention has 91 coils per cylinder, i.e. For example, if a static distribution method is used, and each system Internal combustion engines that have separate (separate) individual injections for each cylinder is particularly appropriate for A number of output stages have separate coils for the pulp itself This is half the amount of conventional equipment. Formed as a unit with ignition coil In each injection group, the output stage of the coil/pulp assembly reservoir is Since it is integrated into the body itself, space and number of components can be further reduced. Wear.

Fuel injectors and The control processing unit for controlling the operation of the ignition device and/or the ignition device according to the present invention It can also be integrated into a loop assembly. This is especially true for equipment waiting for central injection. In this device, one fuel injector; Provided for injecting fuel into the intake manifold.

The present invention provides group injection and For example, in an internal combustion engine with a 2 groups, each generating a high voltage pulse to ignite 4 cylinders Can be applied to cylinder engines with two distros: 1) Viewer. Can also be done. High voltage secondary windings supply high voltage to their respective distributors As a result, it is wound around the coil of the injection valve of that or each group.

Thus, a separate ignition coil for that or each dist+7 view does not need to be provided.

The invention also provides an internal combustion engine with central injection and a dist I) viewer. It can also be applied to an ignition device.

The high voltage secondary winding is connected to the injector to supply high voltage to the dis) IJ viewer. wrapped around a coil. Again, this is for IJ viewers. There is no need to provide a separate ignition coil.

According to a second feature of the invention, the or each fuel injection valve of the injector The switch has an electromechanical actuator containing a coil that performs its opening and closing. In how to control the ignition and fuel injection system of an internal combustion engine such as Thus, a method can be provided that makes it essential for the coil to be used in an ignition device.

A system with one fuel injection valve per cylinder and one coil per cylinder. In this case, the coil of injected pulp in one cylinder is connected to the other cylinder in the same way as the ignition system. Can be connected to a Linder. In other words, one 7 cylinder injection pulse This means that the cylinder coil is used as part of the ignition circuit for another cylinder. Ru. As explained in detail below, such devices provide both intake and exhaust Requires ignition to occur in each particular cylinder when the valves are closed together. If it is required, it is necessary. If both intake and exhaust valves are closed together, If injection is not required to occur when Accordingly, each cylinder's injection pulp coil is connected to one of the same cylinder's igniters. can be used to form a section.

According to the method of the invention, the or each valve coil has at least one " an electrical pulse is provided that switches between an "on" state and an "off" state; The length of the "on" time of that pulse determines the fuel injection period of the valve and The ignition tie for one of the engine cylinders switches to the "off" state. It is desirable that it be the one that decides the timing.

The coil current required to open the injected pulp is typically the same as that required to ensure ignition. smaller than that. Thus, ensuring satisfactory operation while dissipating in the coil each fuel injection for a longer than predetermined length of time to minimize the amount of power This parameter is used to vary the current supplied to the or each coil during the period. Luz is assigned.

the coil for a predetermined length of time before injection is requested. The current supplied is less than the current applied during a predetermined length of time. do not have. A smaller fill current of sufficient degree to ensure the release of the jet pulp. flow is selected. Larger coil currents or predetermined lengths of time selected to be sufficient to ensure fire.

Embodiments of the invention will now be described, by way of example only and with reference to the accompanying drawings, in which: FIG.

FIG. 1 shows the injection and ignition control of a four-cylinder internal combustion engine according to the method of the present invention. is a schematic diagram of an electrical circuit for controlling the Figure 2 is a diagram showing the change in coil current of each valve shown in Figure 1 with respect to time. can be, Figure 6 shows the coil current for each valve shown in Figure 1 when current limiting is applied. It is a diagram showing changes in flow over time, FIG. 4 shows the intake and exhaust valve positions, ignition ties, and FIG. 3 is a diagram representing the relationship between timing and injection timing.

Turning first to FIG. 1, four valve assemblies according to the present invention are schematically illustrated. , and they are designated by the reference numeral 10. Each valve assembly It is tied to each cylinder of the gin. Cylinder is Roman numeral I, It is clothed by n, III, IV. Each valve assembly is coiled and closed The jet pulp has an actuator including an element. In Figure 1, simply A closing element and a coil are depicted, the closing element being represented by the reference numeral 11; The coil is then designated by the reference number 12.

In accordance with the present invention, each coil of the valve assembly is connected to the ignition system of the engine being used. forming part of the According to this embodiment, each coil 12 has primary and secondary turns. contains a wire and acts as an ignition coil for each cylinder. Ru. Thus, separate (separate) coils are configured for each cylinder of the engine. This engine is called a "stationary distribution" because There is. A separate ignition circuit is provided for each cylinder, with each coil Forms part of one ignition circuit. In this example, each of the valve assemblies The coil is connected to the ignition circuit of the separate cylinder to which the valve belongs. .

Only one portion of each ignition circuit is shown in FIG. It is represented by 5. Dotted lines indicate components tied to different cylinders. It separates the elements. In this way, in the device shown in Fig. 1, the valve of cylinder The coil of the valve assembly is connected within the ignition circuit of the cylinder ■, and the coil of the cylinder ■ The coil of the lubricant assembly is connected to the ignition circuit of the cylinder ■, and the coil of the cylinder ■ The coil of the lube assembly is connected within the ignition circuit of the cylinder ■, and the cylinder - The coil of the valve assembly in ■ is connected to the ignition circuit of the cylinder ■. becomes clear.

In each ignition circuit, the battery voltage passes through switching circuit A to the primary coil 12. applied to the winding. The current flows through the transformer biased by resistors R1> and R2. It is led to ground via resistor T1. On the other hand, the magnetic field is created by the current flowing through the primary winding. occurs, which operates the closing element 11 and opens the fuel injection valve, so that the fuel is injected into the cylinder. As is known in today's technology, ignition Rapidly reducing the magnetic field in the primary winding by cutting off the current to the secondary winding Implemented by. At this time, the rapidly changing magnetic field in the primary winding causes the magnetic field in the secondary winding to Induces a high voltage and creates a spark between the electrodes of the spark plug. thus, In the device described here, the electric current in the primary coil of the cylinder When the flow is interrupted, a spark is generated between the electrodes of the spark plug in the cylinder. Ru.

Switching circuit A regulates the current in the primary winding, thereby) Lanzostar T It is provided to protect 1. Each switching circuit contains the same components As such, only one is shown in detail. 1 for each comparator, It includes a diode D1, a second transistor T2, and resistors R3 and R4.

Resistor R3 is connected between the positive supply and the inverting input of 1 to the comparator; It is used to supply positive voltage to power. Resistor R4 is the connection point of 1 and R3 Connect to ground. The output of the comparator is connected to the base of transistor T2. connected and the output of K1 is low, a level representing a logic “0”. source current is supplied to T2, and T2 conducts current from the battery to the coil 12. . The emitter of T1 is coupled to the non-inverting input of the comparator. instructor So, when current flows through the primary coil and transistor T1, the voltage is equal to or less than 1. Added to transfer input. Typically this voltage is less than the voltage at the inverting input of , and therefore the 1 output remains in a logic "0" state.

However, when the current in the primary coil exceeds a certain value, the inverting input of K1 The voltage at switches to a logic "1" state and stops the base current to T2. next T2 switches off and current conduction to the primary winding ceases. transistor The current in T1 drops immediately and the output of 1 on the comparator remains constant for some time. After that, the logic state is returned to "1" and the voltage VV supply to the primary coil is resumed. .

The time is determined by the comparator with a hysteresis of 1 and the coil 12 and the diode. It depends on the loss in the circuit including the transistor T1 and the resistor R1.

This instantaneous switching off of transistor T2 is due to the fact that T1 has a low collector voltage. protects T1 from high power consumption. of current The maximum voltage change on the primary side of the coil when the supply is momentarily interrupted is the applied Since the voltage is not higher than +7, the corresponding secondary voltage remains below the discharge voltage. Therefore, there will be no sparring.

Other parts of the ignition circuit for each coil and spark plug, such as the shutoff itself. The details and connections to the battery are typical and will not be discussed further here. is not required.

FIG. 2 shows the coils in relation to time for each of the four coils shown in FIG. It shows the change in current. The length of time for the current flowing through the coil is Depends on the desired fuel injection time, which should depend on the engine's changing operating conditions. Ru. For the device shown in Figure 1, the injection time is sufficient to charge the coil. Includes time. The solid line indicates the spark that is caused by the interruption. in the primary winding to ensure that sufficient voltage is induced in the secondary winding. It indicates the minimum length of time for the current to be applied. minimum length of time The length is generally about 6 ms.

The dotted line shows the spread of change in Fi injection time.

The injection time varies between a maximum value indicated by a dotted line and a minimum value indicated by a solid line.

In Figure 2, the arrow indicated by It represents the Roke cycle. The circuit for controlling the length of injection time is one general one. As such, no further explanation is required here. Actually, more than 3mS Due to its short length, the timing of the coil in the valve assembly as an ignition coil is There are no difficulties in use. 1 Generally, in the device described here, the When injecting from about 6ms at idle to about 15m5 at full throttle The interval changes. To reduce power dissipation in the coil, the coil current is It also changes during the injection time. This possibility is solved by energizing the coil and closing the valve part 1. The current required to ensure the operation of 1 is required to generate a spark. This results from the fact that it is less than the current. For this reason, as explained earlier so that the injection time is greater than the minimum time required to reliably produce a spark. When this happens, the current applied at the beginning of each fuel injection period is limited. This invention The variation of the coil current with respect to time due to the change of is shown in FIG. Again, the solid line is The minimum amount of time that the current should flow through the coil to ensure spark generation. It shows the length. During those times, the coil current causes the spark to The predetermined value of n will be exceeded to ensure that The dotted line is again , indicating the spread of changes in injection time. Approximately 3 in this example before ignition is desired The current applied to the coil for a predetermined time of mS is less than the current applied during the given time, but ensures that the injection valve is opened. That's enough to make it work. The current limit is in addition to the bins XY shown in Figure 1. It can be controlled by the voltage applied.

FIG. 4 shows the positions of the intake and exhaust valves in this embodiment of the invention, and shows the relationship between ignition and fuel injection time. Vertical axis in closed position represents the valve position measured against. The solid line represents the position of the exhaust valve. The dots and lines represent the positions of the intake valves. This relationship of valve position is It features a 4-stroke stroke. The horizontal axis in the diagram represents time. . The maximum value in the figure represents the fully open position of the valve.

The zigdeg arrow in the figure represents the ignition point, and the horizontal arrow represents the fuel injection point. It represents the end of the interval. As previously pointed out, the length of fuel injection time The point at which they start varies. The equipment shown is for both pulp is selected to inject fuel when the is closed. Currently, this is the desired This is a good layout method. Each pulp assembly coil is for a different cylinder In this embodiment of the invention linked similarly to the ignition conditions, the exhaust valve Injection occurs just before the pulp opens, and ignition occurs when both pulps are completely closed. It is possible to ensure that This is shown in Figure 6. For example, at the same time as the ignition in cylinder I, the cylinder At H, fuel injection ends. Ignition in the cylinder ■ depends on its intake air and Executed when both the exhaust valve and the exhaust valve are closed.

A corresponding fuel injection takes place in cylinder H, and the intake lubricant is still It is closed and ends just before the exhaust valve opens.

In the arrangement described so far, ignition and injection are separated for each cylinder. ) is suitable for such devices. However, the present invention still Regarding the Linder, we have developed a ``direct injection'' system that has been developed so that the end of the injection cycle coincides with the ignition. It can also be applied to a device called a Direct injection devices have some advantages. are doing. For example, if cylinder control is performed and one cylinder is It is also possible to be switched on. This indicates if the cylinder is defective. This is desirable in some cases. This engine then operates with the remaining cylinders Continue to do so. The device previously described is such that two cylinders are switched off simultaneously. - i.e. switching off the injection for one cylinder is not possible for the other cylinders. This kind of cylinder control is not possible because it involves a switch-on. Ru. In fact, the present invention has advantages in direct injection type devices, which Switching off the ignition of one cylinder automatically switches on the injection as well. It depends on what you get.

At any time, even when idling at full speed, the fuel may run out. ignition is also switched off by the L1 switch in the previously described device It will be turned off. Once the fuel is disconnected, ignition is not necessary and therefore This simultaneous switching on reduces power consumption.

Ftc, 4゜ international search report

Claims (13)

[Claims] 1. Electromechanical, including a coil (12) for performing the opening and closing of the actuator There is no fuel in the cylinder or intake manifold of an engine that has an actuator for Valve assembly used in internal combustion engines having a valve for injecting fuel In this case, the coil is also used as part of the engine ignition system. A valve assembly characterized in that it functions even when 2. The valve actuator and the ignition coil of the engine ignition system share one A valve assembly according to claim 1, having a secondary winding. 3. If the valve actuator is a solenoid and its winding is Claim 1 forming the primary winding of an ignition coil of an engine ignition system. Valve assembly as described in section. 4. The valve actuator coil forms the core of the engine ignition coil. any of the preceding claims as having a core used to make Valve assembly as described in. 5. The common output stage for the injection valves and the ignition coil of the engine ignition system is as claimed in any preceding claim, such that the assembly is assembled within an assembly of valve assembly. 6. Central processing unit and/or engine for controlling the operation of the fuel injector as claimed in any preceding claim, wherein the ignition device is integrated within the assembly. Valve assembly as described in the enclosed section. 7. Within a vehicle with group injection and ignition across one or more distributors A device for controlling injection and ignition in a combustion engine, each injection valve has a coil In a device having an electromechanical actuator including: A high voltage secondary winding is used to supply high voltage to each distributor. It is characterized by being wound around the coil of the or each group of valves. equipment. 8. Internal combustion engine with central injection and an ignition system including a distributor A device for controlling the injection and ignition of a fuel injection valve, in which the injection valve is Distributes high voltage in equipment with mechanical actuators. A high voltage secondary winding is wrapped around the injector coil to supply the injector. A device characterized by: 9. To cause the, or each, fuel injection valve of the injector to open and close. The ignition and ignition of an internal combustion engine has an electromechanical actuator containing a coil of and a method for controlling a fuel injector, the coil being used in an ignition system. A method characterized by being able to stay. 10. One fuel injection valve is provided for each cylinder and one cylinder The coils of the cylinder injection valves are used as part of the ignition circuit for different cylinders. 10. The method of claim 9, wherein: 11. One fuel injection valve is provided for each cylinder, and each cylinder injection valve coils are used as part of the ignition circuit for the same cylinder. The method according to claim 9. 12. The or each valve coil has at least one "on" state. An electrical pulse is provided that toggles between one "off" state and one "off" state; The length of time it is "on" determines the valve's fuel injection period, and this pulse The point of switching to the "off" state is the ignition timing for one engine cylinder. 10. The method of claim 9, wherein the method determines the 13. During each fuel injection cycle that is longer than a predetermined length of time, the or each pulse is arranged to vary the current supplied to the coil, and this This allows the coil to be loaded for a predetermined length of time before ignition. the current applied to the coil during said predetermined length of time. 13. The method of claim 12, wherein the flow is reduced to less than the current.