JPS63111233A - Suction air inertia increasing device for internal combustion engine - Google Patents

Abstract

PURPOSE:To increase the volume efficiency of intake air and to improve an output, by a method wherein an acoustic pulse generating device is situated in the suction passage (branch pipe) of each cylinder, and based on a pressure pulse signal from a fuel feed pipe, control is made. CONSTITUTION:A suction passage 2 of a multicylinder diesel engine 1 contains branch pipes 6 (61-66) situated to each of cylinders 51-56. Regarding the branch pipes 6 of cylinders, the piston cycles of which are identical to each other, of the branch pipes 6, the upper streams of the branch pipes 61-63 of a first cylinder group A are collected to a first manifold 8a, and the upper streams of the branch pipes 64-66 of a second cylinder group B are collected to a second manifold 8b. The upper streams of the manifolds 8a and 8b are connected to a suction main pipe 9 through branch pipes 10a and 10b. An acoustic pulse generating device 12 is connected to each of the branch pipes 6, and the device 12 is controlled by a control device 15 according to a signal based on a pressure pulse from a fuel feed pipe 14 connected to a fuel injection nozzle 13.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an inertial supercharging device for an internal combustion engine, and more particularly to an inertial supercharging device for an internal combustion engine that increases the inertial effect of intake air and further improves the volumetric efficiency of intake air. The present invention relates to an intake inertia increasing device.

(Prior Art fJ) In an internal combustion engine, intake air in an intake passage flows as intake inertia waves, which are pressure vibrations, by opening and closing an intake valve. An inertial supercharging device uses this intake inertial wave to increase the volumetric efficiency of intake air and improve output.

Negative pressure generated in the intake port by the suction action of the piston during the intake stroke is transmitted through the intake passage as a negative pressure wave, reflected at the open end of the intake passage, and returned to the intake port as a positive pressure wave.

Pressure oscillations occur due to the combination of these positive and negative pressure waves.

The influence of the pressure vibration generated in the intake passage during the intake stroke on the intake stroke includes an inertial effect and a pulsation effect. Inertia effect refers to the case where pressure oscillations affect the same intake stroke.

Furthermore, the pulsation effect refers to a case where pressure vibrations generated in a certain intake stroke affect the intake stroke of the next cycle. In this application, pressure vibrations in the intake passage including inertial effects and pulsation effects are referred to as intake inertial waves.

The natural frequency of the intake inertial wave is determined by the length and cross-sectional area of the intake passage. Therefore, the length and cross-sectional area of the intake passage are designed so that the natural frequency of the intake inertial wave matches the opening/closing timing of the intake valve. An inertial supercharging device improves the volumetric efficiency of intake air by making the intake inertial waves of the engine have a positive pressure.

(Problems to be Solved by the Invention) However, conventionally, there has been no idea of actively amplifying the amplitude of the intake inertial wave determined by the specifications of the intake passage to significantly improve the volumetric efficiency.

An object of the present invention is to provide an intake inertia increasing device for an internal combustion engine that further improves the volumetric efficiency of intake air by amplifying intake inertia waves in an intake passage in an inertial supercharging device for an internal combustion engine.

(Means for Solving the Problems) The present invention is provided with an acoustic pulse generator that sends acoustic pulses into the intake passage, and uses the fuel pressure canoculus of the fuel supply pipe that supplies fuel to the fuel injection nozzle as a pressure signal. , a control device is provided that converts this into an electrical signal and operates the acoustic pulse generator.

(Example) This will be explained below with reference to the drawings.

A multi-cylinder diesel engine is shown as an internal combustion engine 1 (hereinafter abbreviated as engine). In this embodiment, there are six cylinders, but the number of cylinders is not limited to this.

The engine 1 has an intake system including an intake passage 2, an intake port 3, an intake valve 4, a sill 5, and the like.

The intake passage 2 is configured as follows.

Each sill 51-56 is provided with a branch pipe 61-66. Of the shillings, shillings 51 and 56, 52 and 55, 5 and 5. The cycles of the pistons 7 in each set are the same.

Schilling 51.5□, 5. becomes the first shilling group A. Upstream portions of the branch pipes 6 to 63 corresponding to the cylinder A group are collected in a first manifold 8a.

Also, 54.51.56 shillings! Schilling group B of @2 becomes. Branch 'f? corresponding to Schilling 8 group? 63
The upstream side of the t-shape 66 is assembled into the second manifold 8b.

First manifold 8a, lj@2 manifold 8
The upstream side of b is branched into two and connected to one intake rate W9 via branch passages 10a and 110b, respectively. The intake main pipe 9 is connected to an air cleaner (not shown).

The frequency of the intake inertial wave is determined by the length and cross-sectional area of the branch pipe 6, manifold 8, branch passage 10, intake rate y9, etc., and is matched with the opening/closing speed of the intake valve at a certain tuning frequency of the engine 1. Immediately before the intake valve 4 closes, the intake inertia wave at the intake port 3 becomes a positive pressure.

Each branch pipe6. A pulse tube 11 or 116 is provided in each of the channels 66, and an acoustic pulse generator 12 is provided at each end thereof. Acoustic pulse generator 1
Reference numeral 2 denotes a speaker that uses electromagnetic vibration, and sends acoustic pulses into the branch pipe 6 via the pulse tube 11.

In order for the intake inertial wave and the acoustic pulse to resonate, the frequency f1 of the acoustic pulse must be equal to the frequency f2 of the intake inertial wave of the branch f6.
The following relationship is required.

L=f2n (n is a large number) In order to set the frequency of the acoustic pulse to fl, the same number of acoustic pulses are generated per time as the number of pressure pulses for fuel supply.

The number of injections per hour of the fuel injection valve 13 and the number of openings and closings of the intake valve 4 per hour are the same. On the other hand, the frequency of the intake inertial wave at the synchronized rotational speed of inertia supercharging is the same as the number of rfA closings of the intake valve 4 per hour. Therefore, the number of pressure pulses for fuel supply is the same as the frequency of the intake inertial wave, and if the same number of acoustic pulses is generated, it will resonate with the intake inertial wave.

For this reason, it is configured as follows. Does the fuel injection nozzle 13 and a fuel injection pump (not shown) supply fuel? 714
connected by. A control device 15 is provided which converts the pressure pulse of the fuel in the fuel supply pipe 14 into a pressure signal, converts it into an electric signal, and processes it. The acoustic pulse generator 12 generates acoustic pulses having a frequency equal to or n times the frequency of the fuel supply pressure caballus per hour.

However, since the pressure pulse of the fuel in the fuel supply pipe 14 and the intake inertia wave have different phases due to a time lag, the control device 15 shifts the phases to match them.

The control device 15 is equipped with a sensor unit that converts a fuel pressure signal into an electrical signal, a filter circuit, a circuit that makes the phase in phase with the intake inertial wave, an amplifier circuit, and the like.

16 is a power source that operates the acoustic pulse generator 12.

This embodiment configured as described above operates as follows.

Due to the opening and closing of the intake valve 4, intake inertia waves flow in the intake passage 2. This intake inertial wave synchronizes with the opening/closing speed of the intake valve 4 at a certain synchronized rotational speed, and becomes a positive pressure at the intake port 3 immediately before the intake valve 4 closes.

On the other hand, the fuel pressure signal in the fuel supply pipe 14 is converted into an electric signal by the control device 15, and the acoustic pulse generator 12 generates acoustic pulses having the same number (or n times) and phase as the fuel supply pressure pulses. .

This acoustic pulse and each branch pipe 6. At 66, the intake inertial waves are superimposed and resonate. Since the superimposed intake inertial waves are amplified, the volumetric efficiency of intake air is further improved.

Note that the present invention is not limited to the above embodiments. For example, the pulse tube 11 may be provided in each branch pipe or in an intake passage such as the branch portion 10.

(Effects of the Invention) According to the present invention, a control device converts a fuel injection pressure signal into an electric signal, and causes an acoustic pulse generator to generate an acoustic pulse having a frequency that resonates with an intake inertial wave.

Therefore, by forcibly amplifying the intake inertial waves, the volumetric efficiency of intake air can be further improved and the output can be increased.

Further, since the pressure pulse of fuel injection is converted into an electric signal and the acoustic pulse is set to a frequency that resonates with the intake inertial wave, resonance between the acoustic pulse and the intake inertial wave is ensured.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention. FIG. 2 is a schematic diagram showing the intake system of FIG. 1. 1: Internal combustion engine 2: Intake passage 3: Intake port 4: Intake valve 5 Niji ring 11: Pulse tube 12: Acoustic pulse generator 13: Fuel injection nozzle 14: Fuel supply pipe 15:
Control device 16: power supply

Claims (1)

[Claims] In an inertial supercharging device for an internal combustion engine that improves the volumetric efficiency of intake air by making an intake inertial wave at an intake port become a positive pressure immediately before closing an intake valve, an acoustic pulse is applied to the intake passage. A control device that converts the pressure pulse of the fuel supply pipe that supplies fuel to the fuel injection nozzle into a pressure signal and converts it into an electric signal to operate the acoustic pulse. An intake inertia increasing device for an internal combustion engine characterized by resonating waves and acoustic pulses.