JP2878519B2 - Intake control device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle mounted on a vehicle.
The present invention relates to an intake control device for a type 6 cylinder internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in order to improve fuel efficiency in a partial load region, there is an intake control device in which an intake control valve is provided in an intake passage of each cylinder of an internal combustion engine to control the amount of intake air (for example, JP-A-63-65138).

[0003] In this conventional intake control device, the intake control valve provided in the intake passage of each cylinder is independently opened and closed by each actuator, so that the intake period is substantially shortened regardless of the cam profile. be able to.
By fully opening the throttle valve and inhaling a predetermined amount of atmospheric pressure air, pumping loss can be significantly reduced and fuel efficiency can be improved.

[0004]

However, in the above-described conventional intake control device, since one actuator is provided for each intake control valve, the structure becomes complicated and the number of components increases. However, there is a problem that the space required for mounting on a vehicle becomes large. In particular, when the present invention is applied to a V-type six-cylinder internal combustion engine, if it is to be accommodated in a limited space in the engine room,
Including the large and complicated type 6-cylinder internal combustion engine itself, there are cases where it is impossible to mount the vehicle on a conventional type of intake control device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to simplify the structure and save space to achieve a vehicle equipped with a V-type six-cylinder internal combustion engine. It is an object of the present invention to provide an intake control device for an internal combustion engine which can be applied to a vehicle.

[0006]

In order to achieve the above object, an intake control apparatus for an internal combustion engine according to the present invention comprises: an operating state detecting means for detecting an operating state of a V-type 6-cylinder internal combustion engine; Valve detecting means for detecting the open / close state of an intake valve of each cylinder in a cylinder internal combustion engine; an intake control valve disposed on an intake branch pipe communicating with each cylinder for opening and closing the intake branch pipe; One drive shaft is provided for each bank arranged in a V-shape of the internal combustion engine, and a drive shaft for connecting three adjacent intake control valves of each bank in the same phase, and the drive shaft is rotated by 90 °. And an actuator for simultaneously driving three adjacent intake control valves of each bank, and during the opening period of the intake valve by the valve detection means, the actuator based on an operation state of the operation state detection means. And controls the motor to open and close the intake control valve, and summarized in that a control means for controlling the intake stroke period of each cylinder.

[0007]

According to the above arrangement, three adjacent intake control valves connected to the drive shaft are simultaneously opened and closed by the driving of the actuator. The opening / closing operation of the intake control valve is controlled by the control means, and is performed based on the opening timing of the intake valve detected by the valve detection means. Then, of the three intake control valves that open at the same time, intake is performed only to the cylinder whose intake valve is open. Further, the control means controls the intake stroke period of each cylinder based on the operation state detected by the operation state detection means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an engine system configuration to which the intake control device of the present embodiment is applied.

In FIG. 1, a V-type six-cylinder internal combustion engine (hereinafter, referred to as an engine) 1 is provided with six cylinders S1 to S6, and opposed banks 2A and 2B are arranged so as to be inclined in a V-shape. In the cylinders S1 to S6, intake valves 3 to 8 and exhaust valves (not shown) that are opened and closed by high-speed compatible cams are provided. An intake manifold 9 is connected to the engine 1, and a throttle valve 10 is provided at a gathering portion of the intake manifold 9. The opening of the throttle valve 10 is adjusted by a throttle actuator 11.

[0010] Intake branch pipes 12 to 17 branching from the collecting portion of the intake manifold 9 to the respective cylinders S1 to S6 include:
Intake control valves 18 to 23 are provided respectively. In one bank 2A (left side in the figure) of the engine 1, three adjacent intake control valves 18, 20, and 22 are connected to a shaft 24 in the same phase. At one end of the shaft 24,
An actuator 25 is provided, and the intake control valves 18, 20, and 22 connected to the bank 2A side are simultaneously opened or closed by the driving of the actuator 25.
Similarly, in the other bank 2B (right side in the figure), three adjacent intake control valves 19, 21 and 23 are connected to the shaft 27 in the same phase. An actuator 28 is provided at one end of the shaft 27, and the intake control valves 19, 21, and 23 connected to the bank 2B side are simultaneously opened or closed by driving the actuator 28.

Next, the shaft 2 will be described with reference to FIGS.
4, 27, intake control valves 18 to 23 and actuator 2
5 and 28, the assembly configuration of the shaft 24, the intake control valves 18, 20, 22 and the actuator 25 and the assembly configuration of the shaft 27, the intake control valves 19, 21, 23 and the actuator 28 are the same. Therefore, only the configuration of the shaft 24, the intake control valves 18, 20, 22 and the actuator 25 will be described.

As shown in FIGS. 2 and 3 (section AA in FIG. 2), the shaft 24 is rotatable so that the intake branch pipes 16 and 1 can rotate.
4 and 12, and a small-diameter portion 24 a of a shaft 24 in the intake branch pipe 16 is provided with a circular valve plate-type intake control valve 2.
2 is fastened and fixed by a screw 29. Intake control valve 2
As shown in FIG. 4, reference numeral 2 denotes a structure that swings in a non-contact manner with a very narrow clearance with respect to the inner wall of the intake branch pipe 16.

Each small-diameter portion 24a has a semicircular cross-section as shown in FIG.
4 have the same phase with respect to the rotation center. Accordingly, the intake control valves 18, 20, and 22 are connected to the shaft 24 in the same phase, and are completely overlapped when viewed in the rotation axis direction of the shaft 24.

The actuator 25 is connected to the lower end of the shaft 24, and the protruding end of the support shaft 30 in the casing 32 of the actuator 25 is connected to the shaft 24 so as not to rotate relative to the shaft 24. The magnet member 3 is provided on the outer periphery of the support shaft 30.
3 is fitted. Magnetic poles are formed on the magnet member 33 so as to be circumferentially symmetric and have different poles. Casing 32
A pair of electromagnetic coils 34 and 35 facing the magnet member 33 and a pair of permanent magnets 36 and 37 are disposed on the inner wall of the.

FIG. 5 shows a control circuit for the electromagnetic coils 34 and 35. Two transistors Tr1 and Tr2 for the power supply 38
Are connected in series, and the transistors Tr3 and Tr4 connected in series are connected in parallel to the transistors Tr1 and Tr2, and the electromagnetic coil 34 is connected between the intermediate points a and b of the series circuit. Similarly, 2 for power supply 38
The transistors Tr5 and Tr6 are connected in series, and the transistors Tr5 and Tr6 are connected in parallel with the transistors Tr7 and Tr8 connected in series. An electromagnetic coil 35 is provided between the intermediate points c and d of the series circuit. It is connected. A base terminal of each of the transistors Tr1 to Tr8 is connected to an electronic control unit (hereinafter referred to as an ECU) 3 as control means.
9 is connected.

Transistors Tr1, Tr4, transistor T
By turning on r5 and Tr8, the ECU 39 makes the magnetic pole formed by the electromagnetic coils 34 and 35 and the permanent magnet 3
The magnet member 33 is swung to a position determined by the magnetic poles formed by the magnetic poles 6 and 37. Due to the swing of the magnet member 33, the support shaft 30 and the shaft 24 rotate integrally by 90 °, and the intake control valve 22 swings to the fully open position shown by the solid line in FIG. From this state, by turning on the transistors Tr2 and Tr3 and the transistors Tr6 and Tr7, the ECU 3
Numeral 9 rotates the magnet member 33 integrally by 90 °, and the intake control valve 22 swings to the fully closed position shown by the two-dot chain line in FIG.

In FIG. 1, an injector (not shown) for injecting fuel is disposed downstream of the intake control valves 18 to 23 in the intake branch pipes 12 to 17. The injector is driven by an injector drive circuit 49 to adjust the fuel injection amount and fuel injection timing. The engine 1 also includes a crank angle sensor 41 (valve detecting means) that outputs a pulse signal when the pistons (not shown) of the cylinders S1 to S6 are located at the top dead center (TDC). Speed sensor 4 that outputs a pulse signal to
2 (operating state detecting means and valve detecting means) are provided.

The ECU 39 includes a CPU 44, a ROM 45,
The RAM 46 is configured as a logical operation circuit, and is connected to an input / output unit 48 via a common bus 47 to perform input / output with the outside. The detection signal from each sensor is input / output unit 48
Is input to the CPU 44. On the other hand, the CPU 44 outputs control signals to the actuators 25 and 28 and the throttle actuator 11 via the input / output unit 48. Further, the CPU 44 controls the injection amount and the injection timing by the injector via the injector drive circuit 49, and controls the ignition timing by the ignition timing adjustment circuit 50. In addition, the ECU 39 detects the timing of opening or closing the intake valves 3 to 8 of the cylinders S1 to S6 based on the signals from the crank angle sensor 41 and the rotation speed sensor 42.

Next, the operation of the intake control device for an internal combustion engine thus configured will be described with reference to FIGS. 6 and 7 showing the timing of intake. Now, intake to each of the cylinders S1 to S6 of the V-type six-cylinder engine 1 of the present embodiment is performed at a timing from when the intake valves 3 to 8 are opened to when they are closed, as shown in FIG. The intake order is S1, S2, S3, S4, S5, S6, and S1. In FIG. 6, intake air (shown by a solid line) into cylinders S1, S3, S5 on the bank 2A side and bank 2A
The intake to the cylinders S2, S4, and S6 on the B side (indicated by a two-dot chain line) is performed alternately.

FIG. 7 shows the relationship between the opening and closing timing of the intake valves 3, 5, 7 and the intake control valves 18, 20, 22 in one bank 2A. Hereinafter, only one bank 2A will be described.

As shown in FIG. 7, the cylinder S on the bank 2A side
1, S3, S5 intake (indicated by the two-dot chain line) is S1 → S
The processing is performed in the order of 3 → S5 → S1. Intake valve 3,
The valves 5 and 7 are opened or closed by a high-speed adaptive cam in accordance with the above-described intake sequence. Intake valve 3,
The valve opening timings of the valves 5 and 7 are detected by the crank angle sensor 41 and the rotation speed sensor 42, and the detection signals are input to the ECU 39 as needed.

On the other hand, as described above, the intake control valves 18, 20, 22 are connected to the transistors Tr1, Tr4, T4 in FIG.
When r5 and Tr8 are turned on, the intake control valves 18 and 2 are turned on.
The valves 0 and 22 are turned by 90 ° and opened. When the transistors Tr1, Tr4, Tr5, and Tr8 are turned off, the intake control valves 18, 20, and 22 are turned 90 degrees in reverse and closed. The timing of opening and closing the intake control valves 18, 20, 22 is determined by the intake valves 3, 3 detected by the crank angle sensor 41 and the rotational speed sensor 42.
The intake control valves 18, 20, 22 and the intake valves 3, 5, 7 open and close substantially simultaneously, as shown by the solid lines in FIG. 7. At this time, the intake control valves 18, 20, 22 are connected by the shaft 24, and open and close simultaneously. Therefore, the intake valves 3, 5, 7 of each cylinder are controlled to open once every 720 °, and the intake control valves 18, 20,.
22 is controlled to open once every 240 °. Then, of the intake control valves 18, 20, and 22 opened by driving the actuator 25, intake is performed only to the cylinders whose intake valves 3, 5, and 7 are open.

Normally, the intake control valves 18, 20, and 22 are controlled so as to open during the period when the intake valves 3, 5, and 7 are open, as shown by the solid line in FIG. At the time of low load, control is performed so that the valve closing timing is advanced as indicated by the broken line. This load is detected by the rotation speed sensor 42. As a result, when the load is low, the timing of closing the intake control valves 18, 20, 22 is advanced, so that the amount of intake air to the cylinders S1, S3, S5 is reduced.
At this time, the pressure in the intake branch pipes 12, 14, 16 becomes slightly lower than the atmospheric pressure, so that the pumping loss can be reduced.

In addition, by setting the valve closing timing as described above, the valve closing timing is delayed in a high load region to improve the charging efficiency of the intake air, and the valve closing timing is reduced in a low load region. It is possible to prevent the inhaled air from being inhaled early. And by controlling in this way, the output in both high and low load areas is secured,
As a result, the fuel efficiency represented by the output / loss can be improved.

As described above, in this embodiment, in the V-type six-cylinder internal combustion engine 1, the three intake control valves 18 to 23 adjacent to each of the banks 2A and 2B are in-phase with the shaft 2 in the same phase.
The actuators 25 and 28 were provided on the shafts 24 and 27, respectively. Thereby, the six intake control valves 18 to 23 are connected to the two actuators 25 and 28.
Can be controlled to open and close, and space can be saved. By realizing this space saving, V
The present invention can be applied to a vehicle equipped with a type 6 cylinder internal combustion engine, and the object of the present invention can be achieved. Further, by providing one actuator 25, 28 for each bank 2A, 2B, the actuators 25, 28
And the cost of parts and assembly can be reduced.

The present invention is not limited to the above-described embodiment. For example, the CPU 44 controls the intake control valves 18-2.
The present invention can be arbitrarily changed and embodied without departing from the spirit of the present invention, for example, by controlling not only the valve closing timing but also the valve opening timing.

[0027]

As described above in detail, the intake control apparatus of the present invention connects three adjacent intake control valves of a V-type six-cylinder internal combustion engine via a drive shaft, and provides an actuator disposed in each bank. As a result, since the three intake control valves are simultaneously opened and closed, the configuration of the intake control device can be simplified, and an excellent effect of being applicable to a vehicle equipped with a V-type six-cylinder internal combustion engine is obtained. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an engine system according to an embodiment.

FIG. 2 is a sectional view of an intake control valve.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a diagram for explaining opening and closing of an intake control valve.

FIG. 5 is a diagram showing a control circuit of the electromagnetic coil.

FIG. 6 is a diagram showing the timing of intake to each cylinder.

FIG. 7 is a diagram showing opening / closing timings of an intake valve and an intake control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... V type 6 cylinder internal combustion engine, 2A, 2B ... Bank, 3-8
… Intake valve, 12-17… intake branch pipe, 18-
23 ... intake control valves, 24, 27 ... shafts as drive shafts, 25, 28 ... actuators, 39 ... electronic control units (ECU) as control means, 41 ... crank angle sensors as operating state detecting means and valve detecting means , 42 ...
Rotational speed sensors as valve detecting means, S1 to S6 ... cylinders.

Continuation of the front page (72) Inventor Yurio Nomura 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Denso Co., Ltd. (56) References JP-A-3-15620 (JP, A) JP-A-63-65138 ( JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F02B 29/08 F02D 9/02 361

Claims (1)

(57) [Claims] 1. An operating state detecting means for detecting an operating state of a V-type six-cylinder internal combustion engine; a valve detecting means for detecting an opening / closing state of an intake valve of each cylinder in the V-type six-cylinder internal combustion engine; An intake control valve disposed on the communicating intake branch pipe for opening and closing the intake branch pipe; and one for each bank arranged in a V-shape of the V-type six-cylinder internal combustion engine. A drive shaft that connects three adjacent intake control valves in the same phase, an actuator that rotates the drive shaft by 90 ° to simultaneously drive three adjacent intake control valves of each bank, and the valve detection unit. In the opening period of the intake valve, the control means controls the actuator based on the operating state of the operating state detecting means to open and close the intake control valve, and controls the intake stroke period of each cylinder. Intake air control system for an internal combustion engine characterized by comprising and.