JPS5928734B2 - Intake system for internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system for an internal combustion engine that supercharges only at low speeds.

Traditionally, internal combustion engines, especially diesel engines used in vehicles,
The engine uses a supercharger because the supply air density is increased, the mean effective pressure is increased, the mechanical efficiency and combustion are improved, and the fuel consumption rate is better compared to an unsupercharged diesel engine of the same power. We are prepared.

However, since the diesel engines used in vehicles are operated over a wide rotational speed range, it is difficult to manufacture a supercharger that can supercharge the engine in response to the engine load over that wide rotational speed range. It is.

Because of the way they are installed in vehicles, conventional vehicle superchargers improve supercharging at low speeds and at medium and high speeds, but at the expense of supercharging the other side. . The purpose of this invention is to miniaturize it and make it suitable for mounting on a vehicle.
Increases the supply air density at low speeds, increases the average effective pressure, improves combustion, especially smoke, improves fuel consumption,
An object of the present invention is to provide an intake system for an internal combustion engine that is supercharged only at low speeds and is advantageous in increasing low-speed torque.

To this end, the intake system for the internal combustion engine of this invention is
While connecting the air and cleaner outlet to the intake port of the internal combustion engine, one end is connected to the high speed side intake duct, one end is connected to the middle/high speed side intake duct on the air cleaner outlet side, and the other end is connected to the intake port of the internal combustion engine. detects the speed of the internal combustion engine, the switching pulp placed in the medium/high speed side and low speed side intake ducts on the air cleaner outlet side, the supercharging blower placed in the low speed side intake duct, and the speed of the internal combustion engine. an actuator that operates the switching valve in response to the signal from the speed detector, a drive-side sheep attached to the rotating shaft of the internal combustion engine, and an actuator that operates in response to the signal from the speed detector. It is composed of a driven sheave connected to the rotating shaft of the supercharging blower via an electromagnetic clutch, and a power transmission mechanism consisting of a V-belt wrapped between the driving and driven sheaves.

Hereinafter, preferred specific examples of the intake system for an internal combustion engine according to the present invention will be described with reference to the drawings.

Figures 1) and 2 are diesel trucks.工; PU ``Nini! = The intake system of this invention that was used Red 0 This intake system 1
0 is air. Medium/high speed side intake duct 1 that connects the outlet 48 of the cleaner 45 to the intake chamber 42 of the engine 40
1 and one end inside the air cleaner outlet side. A low speed side intake duct 1 whose other end is connected to the high speed side intake duct 11 and the other end is connected to the medium/high speed side intake duct 11 on the intake chamber side.
2 and air. On the cleaner exit side, the middle. High speed side
and the switching valve 13 disposed at the connection between the low-speed side intake ducts 11 and 12, the supercharging blower 14 disposed at the low-speed side intake duct 12, and the clutch of the engine 40. A speed detector 15 disposed on the housing 44 side, an actuator 16 that operates the switching valve 13 in response to an electric signal from the speed detector 15, and a rotating shaft 41 of the engine 40.
A power transmission mechanism 17 that transmits power from the supercharging blower 14 to the rotating shaft of the supercharging blower 14 is included.

During. The high-speed side intake duct 11 has its upstream end connected to air via a rubber ring 18. It communicates with the outlet 48 of the cleaner 45 and also communicates its downstream end with the inlet 46 of the intake chamber 42 via a rubber ring 19 .

Of course, the intake chamber 42 communicates its two outlets 47 with the intake manifold 43 of the engine 40. Further, the low-speed side intake duct 12 has one end, that is, the upstream end, integrally connected to the upstream side end 20 of the middle/high-speed side intake duct 11, and the other end, that is, the downstream end thereof, is connected integrally to the upstream end 20 of the middle/high speed side intake duct 11. It is integrally connected to the downstream end 21 of the high-speed side intake duct 11.

The switching valve 13 is located on the air cleaner outlet side), and is connected to the middle/high speed side and the low speed side intake ducts 11 and 12,
In other words, at the upstream end, the low-speed intake duct 12 is provided at a location where it branches from the middle/high-speed intake duct 11, and is connected to the actuator 16.

The supercharging blower 14 is a driven engine 23 of the power transmission mechanism 17.
is attached to its rotating shaft 22, and its power 4 transmission mechanism 17
It is driven by the engine 40 via the.

The speed detector 15 is a clutch of the engine 40. ... is placed on the side of the housing 44, detects the rotational speed of the engine 40, and converts it into an electrical signal.

The electric signal is a voltage commensurate with the rotational speed of the engine 40, and the speed detector 1 is used to operate the actuator 16 and the power transmission mechanism 17 according to the electric signal.
5 are connected to those electric circuits 33. The actuator 16 consists of a pneumatic cylinder, the cylinder 2 of which
7 is connected to a pneumatic circuit 29, and an operating rod 28 is connected to the switching valve 13 via an arm (not shown). The pneumatic circuit 29 consists of an air tank 30 ) and a solenoid valve 31 , which are connected by a pneumatic pipe 32 , and the solenoid valve 31 supplies and exhausts air pressure from the air tank 30 to the actuator 16 .

The solenoid valve 31 is a solenoid. A coil (not shown) is connected to an electric circuit 33 and is opened and closed in response to an electric signal from the speed detector 15. The power transmission mechanism 17 includes a drive side engine 2 attached to a rotating shaft 41 of an engine 40.
3, a driven side sheave 24 coupled to the rotating shaft 22 of the supercharging blower 14 via an electromagnetic clutch 25, and a V wound around these, the drive side foot, and the driven side knobs 23 and 24.
- belt 26;

The electromagnetic clutch 25 is fixed to the rotating shaft 22.
・It is composed of a clutch plate made of magnetic material and an electromagnetic coil that magnetically connects the driven side sheave 24 of the clutch plate.The electromagnetic coil is connected to the electric circuit 33, and It operates in response to electrical signals. The electrical circuit 33 for the actuator 16) and the power transmission 17 comprises a power supply 34, an amplifier 35 and a control switch 36, the amplifier 35 having its input connected to the speed detector 15 and its output connected to the speed detector 15. Control Suinochi 36
are connected to each.

Since the intake system 10 is configured in this way, if the engine switch 37 is now closed and the engine 40 is started, the electric signal from the speed detector 15 will determine if the engine 40 is in the low speed range. Since the control switch 36 is closed, the electromagnetic clutch 25 and the electromagnetic valve 31 are operated simultaneously, and the switching valve 13 is operated by the pneumatic cylinder 16 in the middle. The high-speed side intake duct 11 is closed and the low-speed side intake duct 12 is opened, and the supercharging blower 14 is driven by the engine 40 via the power transmission mechanism 17. Therefore, air is air. It flows through the cleaner 45 to the low-speed side intake duct 12, where it is pressurized, and is connected to the intake chamber 42 and the intake manifold 4.
3 into each cylinder (not shown) of the engine 40 to improve combustion at low speeds).

Also, the engine 40 is in the middle. If it is driven at high speeds,
The control switch 36 is activated by the electric signal from the speed detector 15.
is opened, so the electromagnetic clutch 25 is deenergized, the tongomasu 31 is closed, and the switching valve 13 is operated by the pneumatic cylinder 16, so that the electromagnetic clutch 25 is deenergized. The high-speed side intake duct 11 is opened, the low-speed side intake duct 12 is closed, and the supercharging blower 14 is stopped.

Therefore, air is air. After passing through cleaner 45, medium. It flows into the high-speed side intake duct 11, and further flows into the intake chamber 42,
The air is introduced into each cylinder of the engine 40 via the intake manifold 43.

According to this invention having the above configuration, since supercharging is performed only at low speeds, the supercharging blower is made smaller, the entire intake system is made smaller, and the blower can be easily mounted on the vehicle, and the supercharging is performed only at low speeds. The air supply air density is increased, the mean effective pressure is increased, combustion, especially smoke, is improved, fuel consumption is increased, and increased low speed torque is advantageous.

[Brief explanation of drawings]

Figure 1 shows a diesel truck. FIG. 2 is a schematic diagram of an intake system for an internal combustion engine according to the present invention applied to an engine. FIG. 2 is a diagram showing a pneumatic electric circuit of the intake system shown in FIG. 1. 10... Intake system, 11... Middle/high speed side intake duct, 12... Low speed side intake duct, 13... Switching valve, 14... Supercharging blower, 15... Speed detector, 1
6... Actuator, 17... Power transmission mechanism, 2
2...Rotating shaft, 23...5 Drive side sheave, 24...
- Driven side sheave, 25... Electromagnetic clutch, 26...
V-belt, 27... Cylinder, 28... Operating rod, 30... Air tank, 31... Tortoise valve, 40...
...Engine, 41...rotating shaft.

Claims (1)

[Claims] 1 Connect the air and cleaner outlet to the intake port of the internal combustion engine, connect one end to the high-speed side intake duct, connect one end to the high-speed side intake duct, and the other end to the intake port of the internal combustion engine. A switching valve placed in the medium/high speed side and low speed side intake duct on the air cleaner outlet side, a supercharging blower placed in the low speed side intake duct, and a supercharging blower placed in the low speed side intake duct. A speed detector that detects the speed, an actuator that operates the switching valve in response to the signal from the speed detector, a drive-side sheave attached to the rotating shaft of the internal combustion engine, and an electromagnetic device that operates in response to the signal from the speed detector. An intake air intake for an internal combustion engine, including a driven sheave coupled to a rotating shaft of a supercharging blower via a clutch, and a power transmission mechanism consisting of a V-belt wrapped between the driving and driven sheaves. system.