JP2006029287A - Fuel injection valve driving unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contribute to reducing manufacturing cost, by improving versatility capable of widely coping with an engine with a different number of cylinders, in a fuel injection valve driving unit for driving a solenoid fuel injection valve. <P>SOLUTION: This fuel injection valve driving unit 1A has two fuel injection valve driving circuits 10A and 10B for respectively driving a valve for opening, by carrying an electric current to electromagnetic coils 70a and 70b of the fuel injection valve arranged in a different cylinder; and is applied to the engine having the cylinder number of magnification of 2 in a combination of the fuel injection valve driving units 1A of the half number of its cylinder number. A base board 17 of its fuel injection valve driving circuits 10A and 10B is formed in a substantially rectangular shape, by arranging semiconductor elements of diodes 16a and 16b and transistors 14a, 14b, 14c and 14d in substantially one row. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel injection valve drive unit for driving a fuel injection valve in a fuel supply system of an engine.

  In a multi-cylinder engine, in particular, a direct-injection gasoline engine, as described in, for example, Japanese Patent Laid-Open No. 7-4291, an electromagnetically driven fuel injection valve (in order to accurately control fuel supply to each cylinder) A system in which an injector is provided for each cylinder and is driven to open and close by a fuel injection valve drive unit according to a command from an electronic control unit (ECU) is widely adopted.

  As shown in FIG. 6, the fuel supply system in the multi-cylinder direct injection gasoline engine presented in this publication is a fuel injection valve 7a, 7b, 7c, 7d provided in each cylinder of the 4-cylinder engine 4A. Are separately driven using the driving power of the battery 5 by a signal from the fuel injection driving unit 1B connected to the output terminal of the electronic control unit 30A.

  This fuel injection valve drive unit 1B includes four fuel injection valve drive circuits 10C, 10D, 10E, and 10F and is designed exclusively for a four-cylinder engine. It cannot be used for 6-cylinder engines.

  The same applies to other conventional fuel injection valve drive units, and it is designed and manufactured as a unit that usually includes a predetermined number of fuel injection valve drive circuits, as it can be applied only to an engine with a predetermined number of cylinders. Has been. Therefore, since the engine having different numbers of cylinders is individually designed and manufactured, the versatility is poor, and the manufacturing cost tends to be higher than other engine parts that are relatively easy to share and have versatility.

Japanese Patent Laid-Open No. 9-189253 discloses a fuel injection valve drive unit in which the number of switching elements of the fuel injection valve control circuit is grouped to reduce the number of the fuel injection valve control circuits. This makes it possible to reduce the space for installation and arrangement. However, this apparatus cannot be used for an engine having a different number of cylinders, and is poor in versatility, as in the above-described conventional one, and the reduction in production cost due to sharing has not been sufficiently achieved.
Japanese Patent Laid-Open No. 7-4291 Japanese Patent Laid-Open No. 9-189253

  The present invention is intended to solve the above-described problems, and the fuel injection valve drive unit that drives the fuel injection valve has excellent versatility that can be widely applied to engines having different numbers of cylinders. In addition to contributing to a reduction in manufacturing costs, it is an object to minimize the disadvantages associated with the arrangement.

  Therefore, the present invention relates to a fuel injection valve drive unit that is controlled by an electronic control device and drives an electromagnetically driven fuel injection valve. In the two-cylinder engine, two fuel injection valves that are disposed in each cylinder are driven. A fuel injection valve drive unit having a fuel injection valve control circuit is applied to an engine having a number of cylinders that is a multiple of 2 in combination with a unit of half the number of cylinders. The substrate of the drive circuit was arranged in a substantially rectangular shape with semiconductor elements arranged in a row.

  In this way, by combining the required number of fuel injection valve drive units for driving the fuel injection valves for two cylinders, it can be applied as it is to an engine having a cylinder number that is a multiple of two. By designing and producing only one type for the cylinder, it can be easily adapted to many types of engines, so it has excellent versatility and can greatly contribute to cost reduction as a whole. In addition, since the semiconductor elements are arranged in substantially one row and the substrate is made into a substantially rectangular shape, the height can be kept low when the substrate is arranged with one long side down. Space can be minimized.

  If the fuel injection valve drive circuit is made of an aluminum substrate and the semiconductor element is mounted on a bare chip, the production cost can be reduced and the fuel injection valve drive unit can be made more compact. Thus, even when a large number of these are arranged, it is possible to minimize the fear of impairing the degree of freedom in vehicle design.

  Furthermore, if the substrate of the fuel injection valve driving circuit described above is provided with an input / output signal relay portion in which all of the input / output terminals are arranged on a glass epoxy substrate on one long side, the other Since it is easy to connect to the board, it is easy to simplify the connection wiring and the support, for example, by connecting the board to the board inside without enlarging the case of the electronic control device. .

  According to the present invention, by using one type of fuel injection valve drive unit having a fuel injection valve control circuit for two cylinders in combination, it is possible to easily cope with many types of engines having different numbers of cylinders. In addition, it can greatly contribute to the reduction of the manufacturing cost, and by arranging the semiconductor elements in approximately one row and making the substrate substantially rectangular, the arrangement space is minimized and the disadvantages associated with the arrangement are minimized. Can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a circuit layout diagram showing a configuration of a fuel injection valve drive unit 1A in the present embodiment. The fuel injection valve drive unit 1A has two fuel injection valve drive circuits 10A and 10B having the same circuit layout in parallel. In order to form one unit.

  The fuel injection valve drive unit 1A is connected to the battery 5 through power supply voltage terminals 11a, 11b, 11c and 11d, the power supply voltage terminal terminals 12a and 12b are connected to the electromagnetic coil 70a of the fuel injection valve, and the fuel injection valves are connected through the terminals 12c and 12d. The electric power of the battery 5 is used as a driving force for opening the fuel injection valve.

  Further, the fuel injection valve drive circuit 10A disposed on the substrate 17 receives a control signal from an electronic control device (not shown) via terminals 13a and 13b, which is an FET (field effect transistor) or the like. The point connected to the switching transistors 14a and 14b and controlling the energization to the electromagnetic coil 70a is the same as that of a general fuel injection valve drive circuit.

  However, in the present invention, the fuel injection valve drive circuit 10A and the fuel injection valve drive circuit 10B having the same configuration and operation as those shown in FIG. Moreover, it is characterized in that it is arranged in parallel on one aluminum substrate 17 to constitute one compact unit.

  That is, the fuel injection valve drive circuit 10A and the fuel injection valve drive circuit 10B drive the fuel injection valves disposed in different cylinders at the respective timings according to the command of the electronic control device, and have these components. By preparing and combining a plurality of fuel injection valve drive units 1A, it is possible to drive the fuel injection valves corresponding to almost all engines having a number of cylinders that is a multiple of two.

  Further, as shown in FIG. 2, the fuel injection valve drive unit 1A has diodes 16a and 16b made of semiconductor elements and transistors 14a, 14b, 14c and 14d mounted on a substrate 17 made of aluminum in a bare chip manner. The production cost is kept low. Further, the substrate 17 is formed in a laterally-rectangular shape in which these semiconductor elements are arranged in a horizontal row, and the height when one of the long sides is arranged downward can be kept low. Even when used in combination, a large space is not required.

  Further, the input / output signal relay unit 18 having all the input / output terminals described above is a horizontally oriented rectangular glass epoxy in which a part of the back surface thereof is overlapped with the lower long side end of the substrate 17 and fixed with an adhesive. It is arranged on a substrate (glass epoxy substrate). As a result, it can be easily connected to another substrate with an electric wire or the like, and when it is disposed with the input / output signal relay portion 18 facing down, its height is low. An advantage of providing the input / output signal relay portion 18 on the glass epoxy substrate is that it can be easily manufactured by flow soldering.

  FIG. 3 is a cross-sectional view showing an example in which the fuel injection valve drive unit 1A is connected to the substrate 31 of the electronic control device 30A. The input / output signal relay unit 18 of the fuel injection valve drive unit 1A is connected to the end of the substrate 31 of the electronic control unit 1A by a plurality of wires 19, and is tightly fixed to the side wall of the casing 32 with screws 20. .

  That is, the fuel injection valve drive unit 1A has a height lower than that of the side wall of the casing 32 of the electronic control device 30A when the I / O signal relay unit 18 is turned sideways. It is designed to be in close contact with the interior. Further, since the input / output signal relay portion 18 is provided on the glass epoxy substrate and has all the input / output terminals, connection to other substrates is very easy and does not require labor. Therefore, it is easy to minimize the cost for disposing the fuel injection valve drive unit 1A, and the casing 32 of the electronic control device 1A can be installed without increasing the size. Space for installation can be minimized.

  FIG. 4 is a layout diagram showing a case where the fuel injection valve drive unit 1A is applied to a four-cylinder engine. The fuel injection valves 7a and 7b and the fuel injection valves disposed in each cylinder of the four-cylinder engine 4A. 7 shows a state in which two fuel injection valve drive units 1A and 1A for driving the combination of 7c and 7d using the electric power of the battery 5 are disposed in the casing 32 of the electronic control device 30A.

  On the other hand, FIG. 5 shows a layout when the fuel injection valve drive unit 1A is applied to a 6-cylinder engine. The fuel injection valves 7a and 7b provided in the 6-cylinder gasoline engine 4B and the fuel are shown in FIG. The three combinations of the injection valves 7c and 7d and the fuel injection valves 7e and 7f are respectively mounted in the casing 31B of the electronic control device 30B by a combination of three fuel injection valve drive units 1A, 1A, and 1A that are driven in the same manner as described above. This shows the state of being arranged.

  In this way, by preparing and combining the fuel injection valve drive unit 1A having the two fuel injection valve drive circuits 10A and 10B for half the number of engine cylinders, two types of engines, the four-cylinder engine 4A and the six-cylinder engine 4B, are provided. It can be easily applied to the engine, but if this is a multiple of two, it can be applied to a 2-cylinder or 8-cylinder engine, or a 10-cylinder or 12-cylinder engine as well. Therefore, it is extremely versatile and extremely useful for reducing production costs.

  Needless to say, the engine to which the fuel injection valve drive unit 1A of the present embodiment is applied is not limited to the above-described serial type but may be a V-type or a horizontally opposed type. In addition to the fuel injection valve control device unit shown in this embodiment, the fuel injection valve control device unit is the same even if it has an additional function such as a current amplifying means for opening and closing the fuel injection valve quickly and smoothly.

  As described above, by arranging the required number of fuel injection valve drive units that drive the fuel injection valves for two cylinders in combination, it is possible to arrange multiple types of engines with different numbers of cylinders in multiples of two. Since it can be easily applied without requiring labor and excessive space for installation, it is extremely versatile and can greatly contribute to cost reduction. In addition, by arranging the semiconductor elements in a row and making the substrate rectangular, the space for the arrangement can be minimized, and by making the input / output signal relay part a glass epoxy substrate, it can be mounted on other substrates. It can be easily connected, and the disadvantages associated with the arrangement can be minimized.

1 is a circuit layout diagram showing an embodiment of the present invention. The top view which shows the structure on the board | substrate of the fuel injection valve drive unit of FIG. Sectional drawing which shows the case where the fuel injection valve drive unit of FIG. 2 is built in the casing of an electronic control unit. FIG. 2 is a layout view showing a case where the fuel injection valve drive unit of FIG. 1 is used in a four-cylinder engine. FIG. 2 is a layout view showing a case where the fuel injection valve drive unit of FIG. 1 is used in a 6-cylinder engine. The layout which shows a prior art example.

Explanation of symbols

1A fuel injection valve drive unit, 4A, 4B engine, 5 battery, 7a, 7b, 7c, 7d, 7e, 7f fuel injection valve, 10A fuel injection valve drive circuit, 11a, 11b, 11c, 11d, 12a, 12b, 12c , 12d, 13a, 13b, 13c, 13d terminal, 14a, 14b, 14c, 14d transistor, 16a, 16b diode, 17 substrate, 18 input / output signal relay unit, 30A, 30B electronic control device

Claims (3)

In a fuel injection valve drive unit that is controlled by an electronic control device and drives an electromagnetically driven fuel injection valve,
Two fuel injection valve drive circuits for respectively driving the fuel injection valves disposed in each cylinder of a two-cylinder engine are provided, and this is combined with half of the number of cylinders for an engine having a number of cylinders that is a multiple of two. And the substrate of the fuel injection valve driving circuit is formed in a substantially rectangular shape by arranging semiconductor elements in a substantially line.
A fuel injection valve drive unit.   2. The fuel injection valve drive unit according to claim 1, wherein the fuel injection valve drive circuit has a substrate made of an aluminum substrate and a semiconductor element mounted on a bare chip. 3. The fuel according to claim 1, wherein the substrate of the fuel injection valve driving circuit is provided with an input / output signal relay portion in which all input / output terminals are arranged on a glass epoxy substrate on one long side. Injection valve drive unit.

Images