JPS59183027A - Intake device for engine - Google Patents

Abstract

PURPOSE:To supplement an insufficient torque during a slow speed drive, by turning a compressor plus a turbocharger during a slow engine speed. CONSTITUTION:While an engine speed is slow, a root supercharger 13 is driven simultaneously with a turbocharger 6 to increase the filling efficiency of intake air. A high speed engine rotation is detected by a rotation sensor 27 for instructing a micro-computer 26 to close solenoid valves 17, 18. This action interrupts the flow of compressed air into actuators 19, 20, allowing for the return of change-over valves 17, 18 to their normal positions indicated by a solid line. A root pipe 11 and a by-pass pipe 12 form an endless air passage for thereby feeding a compressed air from the turbocharger 6 to a combustion chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine intake system, and more particularly to an engine intake system Q that supplies intake air to the engine through an intake pipe.

By equipping a engine consisting of an internal combustion engine with a turbocharger, it is possible to improve its output. However, the turbine of the turbocharger +7-di 4ν has 41 ICs that are driven by the pressure of the engine's exhaust gas, so when the engine speed is low, the exhaust gas pressure naturally decreases. For this reason, the efficiency of turbocharging +7 is low, and therefore the turbocharger does not have sufficient effect when the engine speed is low.In general, turbocharged engines are used at low speeds Therefore, the exhaust is small,
Moreover, a highly supercharged turbo engine could not be used in a vehicle that requires starting power, such as a tamp truck.

Therefore, as measures to compensate for the low-speed torque of an engine equipped with a turbocharger, improvements have been made to improve the efficiency of the turbocharger's engine, to blow compressed air into the turbine when the engine speed is low, and to perform inertial supercharging. I was there. Alternatively, countermeasures have been taken, such as constructing the turbocharger +7 into a low-speed type by providing West Gooses 1 to 1. However, even with all of the above measures, sufficient low speed 1 to 1 torque is not obtained, and for this reason, in vehicles such as dump trucks that require strong starting force, the pressure is small (high acceleration). Feed type turbo T engine adopted C
I couldn't come.

The present invention was made in view of the problems mentioned in Section 22. It is something that can be written.

The present invention will now be described with reference to an illustrated embodiment.

The drawing shows a six-cylinder diesel engine 1 according to this embodiment, and intake air is sequentially supplied to each cylinder of the engine 1 through an intake pipe 2 and an intake manifold 3. . Then, the exhaust gas generated by the combustion exposure inside the cylinder is released into the atmosphere through the manifold 4 and the exhaust pipe 5.Furthermore, this engine 1 has a turbo engine t=
6, whose turpin 7 is connected to the exhaust pipe 5, and a turbocharged compressor 8 is connected to the intake pipe 2. Furthermore, an air creep 9 is connected to the intake pipe 2. It has become so.

A portion of the intake pipe 2 is composed of a main pipe 10, and a roots pipe 11 is branched and provided in parallel to the main pipe 10. Further, a bypass pipe 12 is provided in parallel to the main pipe 10 and the roots pipe 11. [A roots super dereja 13 is connected to the roots pipe 11. The Roots Super Delager 13 includes a gear 14 that meshes with a gear 16 fixed to the crankshaft 11 of the engine 1. That is, the Roots supercharger 1z13 is configured to be driven by a portion of the output of the engine 1.

Switching valves 17.18 are provided at the branching portions of the main pipe 10 and roots pipe 11, and these switching valves 17.1B are connected to air actuators 19.1B, respectively.
20 performs the C switching.

The supply of compressed air to the air actuator 19.20 is controlled by a 7h magnetic valve 21.22. Further, a switching valve 23 is provided so as to close the outlet side of the bypass pipe 12.
The opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening and closing of the opening 3 are also controlled by the operator 24. and air actu] --
The supply of compressed air to the tank 24 is also controlled by a solenoid valve 25. Furthermore, the three solenoid valves 21
．． 22 and 25 are respectively controlled by control signals from the micro combi coater 26. Microphone [21] Rotation detection sensors 27J5 and -r, - which detect the rotation of the engine 1 are connected to the Nikon Bicoater 26.
E Braunri 28 that detects the operation of the seast flap 4
Each detection output is manually generated.

Next, the operation of turbocharging engine 1 according to the 1st configuration will be explained. First of all, when a vehicle equipped with this J-engine 1 starts, accelerates suddenly, or climbs a steep slope, it uses Roots Super Derage to increase its volumetric efficiency6. ′? In other words, when the rotation detection lens 4127 detects that the rotation speed of the engine 1 is not high, the microphone 1L-1 amplifier 26 supplies a control signal to the solenoid valves 21 and 22, and the These valves 21.22 will be opened to supply compressed air at 19.20 pm. Therefore (in this case, the pair of switching valves 17 and 18 are turned to the position shown by the chain line C in the figure, iPI
Between Xl & valve 25, air is activated from an air tank (not shown) to supply compressed air to the user 24, and the bypass pipe 12 is closed by the switching valve 23.

Accordingly, in this case, the intake air that has passed through the air creep 9 and the compressor 8 of the turbocharger 6 passes through the roots pipe 11 of the intake pipe 2. Furthermore, a roots superderager 13 is connected to this pipe 11, and since it is driven by the engine 1 via gears 16 and 14, this supercharger 133 is
:The intake air will be compressed. This compressed air is then supplied to each cylinder of the engine 1 through the intake manifold 3. Moreover, at this time J
More fuel is supplied to each cylinder of the engine 1 from the fuel injection pump (not shown) and mixed with the above-mentioned intake air to cause a combustion explosion, resulting in higher output.

In this way, in the engine 1 of this embodiment, when the rotation speed is low (and when a large torque is required), the output is increased by increasing the filling efficiency of the intake air with the Roots super charger 13. Therefore, even if the rotational speed of the engine 1 is low and the effect of the turbocharger V7G is not exerted in 11 minutes, the low-speed torque can be improved by the Roots Superge 1ν-gear 13. This makes it possible to obtain a strong starting force, make sudden acceleration possible, and be able to climb even steep slopes. Moreover, it is suitable for compensating for the lack of low speed and torque of highly supercharged L engines.

Next, when a vehicle equipped with this 1 engine 1 runs at medium speed or high speed, this is detected by the rotation detection lever 27.
Detected by the microphone computer 26, the solenoid valve 21
．． 22 close each other. Accordingly, the supply of compressed air to the actuator 19.20 is cut off, and the switching valve 17.18 is rotated to the position shown by the solid line in the figure. Therefore, in this case, the intake air does not flow to the roots vibe 11 and the bypass vibe 12. All the intake air passes through the main vibe 10. Therefore, when the rotational speed of the engine 1 is sufficiently high, the intake air is compressed by the compressor 8 of the turbocharger 6 and supplied to each cylinder of the engine 1, thereby improving the output.

In this case, the solenoid valve 25 is closed in response to an instruction from the microcomputer 26, and the actuator 24 switches the changing valve 23 to a position not shown by the solid line in the figure. Therefore roots pipe 11 and bypass vibe 12
This creates an endless air passage. Therefore, the air compressed by the C Roots supercharger 13 will circulate endlessly through the passage consisting of the vibes 1, 1, and 12, and as a result, the air compressed by the Roots supercharger
C2 is to collect the 13th item. Therefore, the roots superbu V-gilet 13, which is connected to the engine 1 through gears 16 and 14, is prevented from being a load on the engine 1, and the deterioration of fuel efficiency is minimized. There is.

Next, when the vehicle equipped with this engine 1 applies the engine brake, the engine brake sensor 28 detects this. Zoshi Nireni J: Tsu C Mike [
1] The pump coater 26 supplies control signals to the three solenoid valves 21, 22, and 25, respectively, and the three actucoators 1
9.20.24 L "Supplies compressed air. 1 Therefore, in this case, as in the case of starting above,: 3 switching valves 1
7.18.23 will be rotated to the position shown by the chain line in the figure. Therefore, in this case, turboboo 11-diIr
61, the I'L compressed intake air is further IITwled by Roots Super Di V13. That is, the Roots supercharger p13 uses a part of the output of the engine 1 to further compress the intake air, and as a result, the Roots supercharger 13 loads the engine with Utl load U %lJ <. Therefore, from this, the braking force of the engine 1 is further increased, and it becomes possible to further increase the braking force for engine braking and -key.

Although the present invention has been described above with respect to one embodiment shown in the drawings, the present invention is not limited to the actual details, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, Roots Superb P-di 1'7
Roots pipe 11 and bypass vibe 12 are attached to the platform where 13 is not used.
Are you trying to collect one thing? Bypass vibe 12
Instead of setting up engine 1, super engine Ir.
13 A clutch may be provided between the two. In addition, in the above example (Ha Roots Super Di 1!-Zi p 1
3. J is mainly intended to improve low-speed torque, but it is possible to use C and various other compressors instead of the Roots super compressor.

The present invention is to add a branch pipe [1] to the intake pipe.
) At the same time, a compressor driven by the engine is connected to this branch pipe, and a switching valve installed at the branch part of the branch pipe is switched to switch the intake air to the compressor eL as required.
``This relates to the intake system of a compressed engine that supplies air to a compressed C engine.

Therefore, according to the present invention, by compressing the intake air with the compressor and supplying intake air, it becomes possible to increase the engine output to any desired state C or F, for example, at low speed of a turbocharged engine. By operating the compressor on the side, it becomes possible to compensate for the lack of low-speed torque.

[Brief explanation of the drawing]

The drawing is a plan view showing an intake system for an engine according to an embodiment of the present invention. In the symbols used in the drawings, 1...Diesel engine 2...Intake pipe 6...Turbocharger 10...Main pipe 11...・Roots pipe 13...Roots Superge 17-Jiya 17,.
18...Switching valve 19.20...Air 7 gear 7.

Claims (1)

[Claims] In a device that supplies C intake air to an engine through an intake pipe, a branch pipe is installed in the intake pipe.
J + Ko, hit note, by the engine (connect a single wire machine driven to this branch pipe and install it at the branch part of the branch pipe)
An intake system for a one-engine engine, characterized in that the intake air is compressed by the compressor and supplied to the engine as necessary by switching the switching valve.