JPH0441928A - Quasi-supercharging system for diesel engine - Google Patents

Abstract

PURPOSE:To enable an operation conforming to supercharging engine by arranging a blower driven by means of a part of an output of a crank shaft in a bypass formed at an intake pipe and by making selection between this bypass and the intake pipe possible through a switching means. CONSTITUTION:In a diesel engine in which an air purified at an air cleaner 3 is supplied to an intake manifold 1 through an intake pipe 4, a bypass 5 for the intake pipe 4 is formed, in the middle of which a blower 6 is provided, and an impeller 7 provided inside this blower 6 is attached at the tip end of a crank shaft 8. Also, in the intake pipe 4, a butterfly valve 17 is provided between a branch part 15 and a combined part 16 of the bypass 5, and intake of air into the intake manifold 1 is made switchable either to the intake pipe 4 or the bypass 5 by opening/closing of the valve, which is controlled according to a revolution number and load of an engine 2.

Description

[Detailed description of the invention] [Industrial Application Field J This invention applies to diesel engines.

By increasing the amount of air, N
The present invention relates to a system for achieving Ox reduction.

[Conventional technology]

In order to comply with exhaust gas regulations for automobile diesel engines, measures are being taken to delay fuel injection timing in order to reduce N I"l x.

There is a possibility that 29 times will lead to a decrease in output performance.
Two effective countermeasures to this problem are to increase the amount of air, and conventionally, intake inertia technology has been used to increase the amount of air.

The increase in air volume on the low speed side has already reached its limit and is zero.

[Problem to be solved by the invention]

An object of the present invention is to provide a means for increasing the amount of air in a diesel engine, particularly on the low speed side.

[Means to solve the problem]

The present invention provides a diesel engine in which a part of the output of the crankshaft is used to drive the impeller of a blower, the blower is disposed in a bypass formed in an inch-long pipe, and the blower is disposed in a bypass formed in an inch-long pipe. The present invention proposes a semi-supercharging system for a diesel engine, characterized in that the intake pipe and the intake pipe can be selected through a switching means.

[Effect]

In the system of the present invention having the above configuration, 1, for example, an impeller of a blower used in a turbocharger is mounted on the tip of the crankshaft, the blower is disposed in a bypass provided for the intake pipe, and the switching means By switching between this bypass and the intake tm, the switching means switches to the bypass as necessary at low speeds, pushes the increased amount of air through the floor into the intake manifold, and the engine However, it performs the same effect as supercharging, that is, semi-supercharging.

[Example〕 Next, the system of the present invention will be explained with reference to the accompanying drawings.

In FIG. 1, ■ is the intake manifold of the Nireshin 2, and the air purified by the air cleaner 3 is passed through the intake pipe 4 into this intake manifold 1.
This is a common configuration for diesel engines.

In this invention, a bypass 5 for the internal conduit 4 is provided.
A blower 6 is interposed in the bypass 5, and an impeller 7, which is inserted into the bypass 5, is attached to the tip of the crankshaft 8.Actually, the tip of the crankshaft 8 A pulley 9 is attached to the radiator 12. A pulley 9 is attached to the radiator 12 and a cooling fan 13 is attached to the radiator 12. The impeller 7 is coupled to the crankshaft 8 in series with the pulley 9, and is rotated by using a part of the output of the crankshaft 8. In the figure, 14 is a tamper.

A branch portion 1 of the bypass 5 is provided in the intake pipe 4.
A butterfly valve 17 as a switching means is provided between the intake manifold 1 and the merging section 16, and by opening and closing the butterfly valve 7, air intake in the intake manifold 1 is switched between the intake pipe 4 and the bypass 5. be able to do so.

In the above configuration, when the butterfly valve 17 is closed according to the rotational speed and load of the engine 2, the air from the air cleaner 3 is transferred to the front ME, (the intake manifold 11) by the action of the blower 6 in the middle of the bypass 5. ＼It is press-fitted, and as a result, an increase in the amount of air can be achieved.

In addition, as a practical gap, a crack mechanism is provided to disconnect and disconnect the crankshaft 8 and the impeller 7 of the blower 6 in connection with the operation of the butterfly valve 17 (2. Therefore, when the bypass 5 is not used, i.e. Idling of the blower 6 can be prevented under operating conditions where semi-supercharging is not performed.

By employing the system of the present invention having the above configuration, the amount of air can be increased as necessary to improve combustion in the Tee Cell engine from low speed to near the maximum torque point.

In Niga et al., the relationship between the improvement of volumetric efficiency due to the increase in air volume and the improvement of smoke mainly at low speeds is shown in FIGS. 2 and 3. [Effects of the Invention] With the above configuration of the present invention, it is possible to perform an operation similar to a supercharged engine with a relatively simple additional structure to the Tee Cell engine, and achieve combustion improvement and smoke improvement on the transmission side. It is something.

[Brief explanation of drawings]

This is a club that shows the results of improvements in combustion and smoke that came with its adoption. In addition, in the figure. 1 Engine 4 Intake pipe bypass blower winder crankshaft switching means (butterfly valve). Figure 2: Engine 4: Intake line 5: Bypass 6: Blower 7: Impeller 8: Crankshaft 17: Switching means (butterfly valve)

Claims (1)

[Claims] (1) In a diesel engine, a part of the output of the crankshaft is used to drive the impeller of a blower, the blower is arranged in a bypass formed in the intake pipe, and the bypass and the intake pipe are connected. A semi-supercharging system for a non-supercharging diesel engine, characterized in that selection is possible through a switching means.