JPH05149142A - Exhauster of v-type multiple cylinder engine with exhaust turbosupercharger - Google Patents

Abstract

PURPOSE:To improve a collecting efficiency of exhaust energy so as to increase a supercharging efficiency of a V-type multiple cylinder engine by providing exhaust manifolds connected to turbins of exhaust turbosuperchargers which are provided with exhaust ports of all cylinders, ignited respectively in odd and even number of orders, in correspondence with banks. CONSTITUTION:An exhaust manifold 16 which is connected to a turbin 7 of an exhaust turbosupercharger 5 is provided, wherein the turbin 7 is provided with exhaust ports of all cylinders #1, #4, #6, #7, ignited respectively in even number of orders, in correspondence with one of banks 3. An exhaust manifold 15 which is connected to a turbin 6 of an exhaust turbosupercharger 4 is provided, wherein the turbin 6 is provided with exhaust ports of all cylinder #2, #3, #5, #8, ignited respectively in odd number of orders, in correspondence with the other bank 2. With such a constitution, supercharging efficiency of the exhaust turbosuperchargers 4, 5 is improved, because exhaust pulses supplied to both turbins 6, 7 are controlled at regular intervals and thus collecting efficiency of exhaust energy by each turbin 6, 7 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for a V-type multi-cylinder engine equipped with an exhaust turbocharger, and more specifically, to improve recovery efficiency of exhaust energy which is a drive source of the exhaust turbocharger. The present invention relates to an exhaust device that can be used.

[0002]

2. Description of the Related Art In a conventional V-type multi-cylinder engine equipped with an exhaust turbocharger, for example, as shown in FIG. 2, each cylinder # 1, # 2 arranged in a pair of left and right banks A, B.
By connecting the exhaust port of # 8 and the turbines E and F of the pair of exhaust turbochargers C and D provided corresponding to the banks A and B via exhaust manifolds G and H, respectively, The energy of the exhaust gas emitted from the cylinders of the banks A and B is recovered by the turbines E and F and the compressors I and J are used.
Had to drive. K and L are air supply pipes that supply the air discharged from the compressors I and J of the exhaust turbochargers C and D to the intercooler M, and N and O are the air cooled by the intercooler M in each bank A and B. It is an air supply manifold that is distributed and supplied to the cylinders.

In a V8 cylinder engine, for example, the ignition sequence (exhaust sequence) is as follows: first cylinder # 1, eighth cylinder # 8, fourth cylinder # 4, second cylinder # 2, seventh cylinder # 7. ,
The third cylinder # 3, the sixth cylinder # 6, and the fifth cylinder # 5 are set in this order. Therefore, in the first bank A constituted by the first cylinder # 1 to the fourth cylinder # 4, the exhaust stroke of the second cylinder # 2 overlaps with the exhaust stroke of the fourth cylinder # 4 and causes interference,
In the second bank B composed of the cylinders # 5 to # 8, the exhaust stroke of the fifth cylinder # 5 overlaps with the exhaust stroke of the sixth cylinder # 6.

For this reason, each bank A, B is conventionally used.
In the system in which the exhaust gas of the cylinders included in the above is uniquely supplied to the turbines I and J of the exhaust turbochargers C and D by the exhaust manifolds G and H provided corresponding to the banks A and B, respectively. Exhaust gas is supplied to the turbine turbochargers C and D of the turbines I and J at unequal intervals, and there is a problem that the efficiency of exhaust energy recovery by the turbines I and J cannot always be increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a turbine of an exhaust turbocharger provided corresponding to each bank by changing the structure of an exhaust manifold. It is an object of the present invention to improve the exhaust gas energy recovery efficiency and improve the supercharging efficiency of a V-type multi-cylinder engine.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to all cylinders arranged across a pair of left and right banks provided in a V-type multi-cylinder engine with an exhaust turbocharger. Among them, the exhaust ports of all cylinders that ignite an odd number are connected to the turbine of the exhaust turbocharger that is provided corresponding to one bank, and the exhaust ports of all cylinders that ignite an even number Is provided with an exhaust manifold that is connected to the turbine of the exhaust turbocharger provided corresponding to the other bank.

[0007]

The exhaust gas discharged from each cylinder due to the operation of the engine is supplied to the turbine of each exhaust turbocharger through both exhaust manifolds, and the air pressurized by the compressor driven by this turbine is It is distributed and supplied to the cylinders of the bank corresponding to each supercharger.

Further, the exhaust turbocharger turbine has exhaust gas from all odd-numbered cylinders or even-numbered cylinders out of all cylinders arranged across both banks. As a whole, both turbines are alternately supplied with exhaust pulses in order to be supplied. Therefore,
In an evenly ignited engine, each turbine is supplied with exhaust pulses at equal intervals, and even in the case of an unequally ignited engine, the exhaust pulses supplied to each turbine are substantially evenly spaced. In order to be close,
In either case, the exhaust energy recovery efficiency of each turbine is increased, the driving force of the compressor is increased, and the supercharging efficiency is improved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic plan view of a V-type multi-cylinder engine with an exhaust turbocharger equipped with an embodiment of an exhaust system according to the present invention. The ignition order (exhaust order) is the first cylinder # 1,
V-type 8-cylinder engine in which the eighth cylinder # 8, the fourth cylinder # 4, the second cylinder # 2, the seventh cylinder # 7, the third cylinder # 3, the sixth cylinder # 6, and the fifth cylinder # 5 are set in this order. 1 is provided with a first bank 2 located on the right side and a second bank 3 located on the left side of the engine 1 when viewed from the front. The first bank 2 is formed by arranging the first cylinder # 1 to the fourth cylinder # 4 linearly from one end to the other end of a crankshaft (not shown), and the second bank 3 is the first bank # 1 to the fourth cylinder # 4. 5th cylinder # 5-8th cylinder #
8 are arranged linearly from one end of the crankshaft (not shown) toward the other end.

The first exhaust turbo supercharger 4 and the second exhaust turbo supercharger 5 provided corresponding to the first bank 2 and the second bank 3 are turbines 6, 7 and compressors 8, respectively. It is composed of 9. Then, the discharge port of the compressor 8 of the first exhaust turbocharger 4 and the first bank 2
And the air supply ports (not shown) of the first cylinder # 1 to the fourth cylinder # 4 constituting the first air supply pipe 10 and the intercooler 1.
5th cylinders # 5 to # 8, which are connected to each other through the first and first air supply manifolds 12, and which constitute the discharge port of the compressor 9 of the second exhaust turbocharger 5 and the second bank 3.
The intake port of cylinder # 8 (not shown) and the second intake pipe 1
3, intercooler 11 and second air supply manifold 1
It is connected via 4. The interior of the intercooler 11 is divided so as to correspond to the banks 2 and 3 so that the air discharged from the compressors 8 and 9 does not interfere with each other.

The first and second exhaust turbochargers 4,
Of the exhaust manifolds 15 and 16 that supply exhaust gas to the turbines 6 and 7 of FIG.
As shown in FIG. 1, the exhaust ports (not shown) of the second cylinder # 2, the third cylinder # 3, the fifth cylinder # 5 and the eighth cylinder # 8 are
Connected to the exhaust supply port (not shown) of the turbine 6 of the exhaust turbocharger 4, and the second exhaust manifold 16 includes the first cylinder # 1, the fourth cylinder # 4, the sixth cylinder # 6, and the seventh cylinder. # 7
The exhaust port (not shown) of the second exhaust turbocharger 5
Is connected to an exhaust supply port (not shown) of the turbine 7.

That is, all of the cylinders # 1 to # 8 arranged across the first and second banks 2 and 3 are divided into an odd number cylinder group and an even number cylinder group according to the ignition order. The exhaust ports of the second cylinder # 2, the third cylinder # 3, the fifth cylinder # 5, and the eighth cylinder # 8, which are classified and evenly ignited, are provided to the turbine 6 of the first exhaust turbocharger 4 first. No. 1 cylinder # 1 and No. 4 cylinder # 4, which are connected through the exhaust manifold 15 of
The exhaust ports of the sixth cylinder # 6 and the seventh cylinder # 7 are connected to the turbine 7 of the second exhaust turbocharger 5 via the second exhaust manifold 16.

Therefore, when the engine 1 is operated, exhaust pulses are alternately supplied to the turbines 6 and 7 through the exhaust manifolds 15 and 16, respectively, and when the engine 1 is ignited at equal intervals. Equally spaced exhaust pulses are provided. Further, even when the engine 1 is ignited at unequal intervals, the exhaust pulses are alternately supplied to the turbines 6, 7, so that exhaust pulses at substantially equal intervals are supplied. The efficiency of exhaust energy recovery by 7 is improved, and the supercharging efficiency by the exhaust turbochargers 4, 5 is improved.

Although the present invention is applied to a V-type 8-cylinder engine in the embodiment, for example, a V-type 6-cylinder engine, a V-type
In the case of a type 10 cylinder engine or a V type 12 cylinder engine, the exhaust manifolds of all the cylinders that are ignited in the odd numbered order are also ignited in the exhaust manifold that leads to the turbine of one exhaust turbocharger and the even numbered one. The intended purpose can be achieved by providing an exhaust manifold that guides the exhaust port of the cylinder to the turbine of the other exhaust turbocharger.

[0015]

As is apparent from the above description, according to the present invention, the exhaust pulse supplied to the turbine of each exhaust turbocharger can be made equal intervals by changing the configuration of the exhaust manifold. Exhaust energy recovery efficiency in the exhaust turbocharger is increased, and more efficient supercharging can be performed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a V-type multi-cylinder engine with an exhaust turbocharger equipped with an embodiment of an exhaust system according to the present invention.

FIG. 2 is a schematic plan view showing a conventional example.

[Explanation of symbols]

 1 Engine 2 1st Bank 3 2nd Bank 4 1st Exhaust Turbocharger 5 2nd Exhaust Turbocharger 6 Turbine 7 Turbine 8 Compressor 9 Compressor 15 1st Exhaust Manifold 16 2nd Exhaust Manifold

Claims (1)

[Claims] 1. Exhaust gas is provided by providing a pair of left and right banks in which a plurality of cylinders are arranged from one end of a crankshaft toward the other end, and a pair of exhaust turbochargers provided corresponding to each bank. In a V-type multi-cylinder engine with an exhaust turbocharger in which air pressurized by a turbocharger is distributed to each cylinder, an odd-numbered cylinder among all the cylinders arranged across both banks is provided. An exhaust manifold is provided that connects the exhaust ports of all igniting cylinders to the turbine of one exhaust turbocharger, and connects the exhaust ports of all evenly igniting cylinders to the turbine of the other exhaust turbocharger. An exhaust device for a V-type multi-cylinder engine with an exhaust turbocharger, which is provided with an exhaust manifold.