JPS5877123A - Turbosupercharged engine - Google Patents

Abstract

PURPOSE:To improve responsive action of an engine at acceleration and starting times, by providing plural superchargers of small inertial mass. CONSTITUTION:Intake air from an air cleaner 29 is respectively compressed by compressors 30, 31 of two superchargers 27, 28, flowing in through a pair intake manifolds 32, 33, and respectively fed to cylinders 21-26. Supercharge is performed by the two superchargers 27, 28, small in size as compared with size of an engine 20, and inertial mass of respective turbines 35, 36 can be decreased. Then the inertial mass of the two superchargers 27, 28 is not added, and responsive action, corresponding to inertial mass of a single supercharger, can be obtained, thus accelerating quality can be improved at acceleration and starting times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbocharged engine, and in particular to a turbocharged engine E with improved response during acceleration and starting.
It is something that I will do.

As shown in FIG. 1, a conventional turbocharged engine compresses intake air supplied from an air cleaner 3 by a compressor 2 of a turbocharger 1, and transfers the compressed air to an engine (non-engine cylinder 5) by an intake manifold 4. .6.7
．． 8.9, IOJζ was being supplied. Then, the exhaust gas of the engine is passed through the exhaust manifold 11.12 to the supercharger 1.
The turbine 13 is then driven to exhaust the air.

In such a turbocharged engine, as the engine becomes larger and the number of cylinders increases, the supercharger 1 also becomes larger and its inertia also increases. When the inertial mass of the supercharger 1 becomes large, there is a drawback that the response during acceleration or starting is reduced.

The present invention has been made in view of these problems, and is provided with a plurality of superchargers, and these superchargers perform turbocharging. Therefore, the inertial mass of each supercharger becomes smaller, resulting in improved response.

An embodiment in which the present invention is applied to a six-cylinder diesel engine shown in FIG. 2 will be described below. This engine W is 6
The cylinders 21, 22, 23, and 24 are provided with cylinders 21, 22, 23, and 24, and the cylinders 21 to 26 are configured to be turbocharged by a supercharger 4. That is, the intake air from the air cleaner is compressed by two supercharged compressors 30131, respectively, and is supplied to the cylinders 21, 21 and 24, 25, 26 by a pair of intake manifolds, respectively. . Exhaust gas from the cylinders 21, 22, and 23 is taken out by an exhaust manifold, and the tip of this manifold is branched into two parts to be distributed and supplied to the turbine of the supercharger n1Z.

Similarly, the exhaust from the cylinders 5 and 3 is taken out by an exhaust manifold 37, and is distributed and supplied to the two turbines A through a branch at its tip. In this way, the turbines 35, 36 are driven to discharge.

In the engine according to this example number ζ, since supercharging is performed by two superchargers 4, which are small compared to the magnitude of the engine load, each supercharger's , the inertial mass of the island can be reduced. And since the inertial masses of the two superchargers 27 and 28 are not added together, a response commensurate with the inertial mass of one supercharger can be obtained, which significantly improves the acceleration performance at the time of initial acceleration and when starting. do. Also cylinder 21. η, the exhaust from the mu is connected to two turbochargers or a public turbine 35.36! by means of an exhaust manifold whose outlet side branches into two. The exhaust gases from the cylinders, δ, and rear are also supplied to the two turbines, A, by the exhaust manifold 37, respectively. Therefore, pulsating energy of 6 pulses is given to the turbine 36 of the supercharger n1β in 2 rotations, and the balance between the two superchargers 4 and 4 can be maintained.

FIG. 3 is a graph showing a comparison of the start-up characteristics of the engine according to this embodiment and the conventional engine according to FIG. 1. Since the inertial mass of the machine n1 during rotation has become smaller, the response is better and it shows a better start-up when taking off. Note that the characteristics indicated by the dotted line in the figure are those of a conventional engine equipped with a single supercharger.

As described above, according to the present invention, by providing a plurality of turbo superchargers, it is possible to reduce the inertia mass of each supercharger.
It becomes possible to provide an engine with excellent startup characteristics.

Furthermore, according to an embodiment of the present invention, in which the exhaust gas from a plurality of cylinders is distributed and supplied to a plurality of superchargers, it is possible to balance the plurality of superchargers, resulting in a more stable turbo charger. Supercharging can be performed.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a turbocharged engine on the slave side, Fig. 2 is a plan view of a turbocharged engine according to an embodiment of the present invention, and Fig. 3 is a plan view of the engine of this embodiment and a conventional engine. Graph showing a comparison of start-up characteristics・Supercharger 1131...Compressor proverb, O...Intake manifold style, 37...Exhaust manifold door, A...
...It's a turbine. Applicant Hino Motors Co., Ltd. Figure 1 Figure 3 Shimon

Claims (1)

[Scope of Claims] 1. A turbocharged engine in which a turbocharger compresses intake air and supplies the compressed air to a plurality of cylinders, the engine being equipped with a plurality of turbochargers. 2. The turbocharged engine according to claim 1, wherein exhaust gas from the plurality of cylinders is distributed and supplied to the plurality of turbochargers.