JPS641467Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable air supply pipe device for an exhaust turbocharger with low energy loss.

The air supply pipe for the conventional exhaust turbo supercharger is
The engine was supercharged by connecting the cylinder 1 and the exhaust turbo supercharger 10 through a single intake pipe, but
This method has the disadvantage that the compressor outlet speed of the supercharger fluctuates greatly in the high and low rotation ranges as shown by the dotted line in Figure 1, and the amount of air supplied to each cylinder varies greatly.

The purpose of the present invention is to eliminate the drawbacks of the prior art,
To provide a variable air intake pipe device which effectively utilizes the boost energy of an exhaust turbo supercharger from a low rotation range to a high rotation range to reduce fuel consumption.

An embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 2 is a configuration diagram of the variable air supply pipe device.
1 is a cylinder, 2 is an air supply pipe with a small diameter for low rotation range matching that constantly communicates the turbocharger 10 and cylinder 1, and 3 is an air supply pipe outside the thin air supply pipe 2 that is used together only in high rotation ranges. 4 is a variable valve that closes in the low rotation range of the compressor 9 and opens in the high rotation range, and the valve is installed at each cylinder 1. The position is set so that the dynamic pressure of the low-speed air supply pipe 2 can be maintained upstream 14 near the inlet of the engine. Reference numeral 5 denotes a variable valve having almost the same mechanism as the variable valve 4, and the variable valve 5 is installed at a position downstream near the compressor outlet 7, where the variable valve 4 is installed at a position where the dynamic pressure of the low-speed air supply pipe 2 can be obtained. The position is such that the energy entering the rotation range air supply pipe 3 is not lost. Therefore, variable valves 5 and 4 are provided at each end of the bypass-like air supply pipe 3 and at the connection portion with the air supply pipe 2. The dotted line 6 is a connecting pipe connecting the compressor outlet 7 and the variable valves 4 and 5 for obtaining the operating air pressure of the variable valve.
8 is a turbine, 9 is a compressor, and 10 is a turbo supercharger. Fig. 3 is a diagram of the variable valve mechanism, where 2 is the air supply pipe for low rotation range matching, 3 is the bypass air supply pipe for high rotation range matching, and multiple layers are provided on the outer periphery of the air supply pipe, and 4 and 5 are for both air supply pipes. A variable valve for communicating or blocking the trachea 2 and 3; 7 is a compressor outlet; 12 is a piston; 13 is a spring; 14 is an air supply pipe inlet to the cylinder 1; and 15 is an operating cylinder for the variable valves 4 and 5.

Furthermore, the compressor 9, the cylinder 1, the air supply pipe 2,
3 will be described in detail, the compressor 9 and the cylinder 1 are directly connected via a thin air supply pipe 2, and a thick air supply pipe 3 that covers the outer circumference of the air supply pipe 2 is connected in the middle part of the air supply pipe 2 in a bypass manner. The upstream end of the air supply pipe 3 communicates with the compressor outlet pipe 7 via the variable valve 5, and the downstream end of the air supply pipe 3 communicates with the inlet pipe 14 of the cylinder 1 via the variable valve 4. are doing.

The operation of the embodiment configured as described above will be explained.

When the engine starts, high pressure air is supplied from the compressor 9 to the cylinder 1, and the engine is started. When the compressor 9 is in a low rotation range, the supply pressure at the compressor outlet 7 is low and the biasing force of the spring 13 overcomes this supply pressure, and the variable valves 4 and 5 are closed, and the supply air from the compressor 9 is supplied to the pipe diameter. Since the engine is driven only by the thin air supply pipe 2, the speed fluctuation at the air supply outlet 7 from the compressor 9 is small, as shown by the solid line in Figure 1, and the error in the amount of air supplied to each cylinder is small. stomach. Next, when the engine speed increases and the compressor 9 reaches a high speed range, the supply pressure at the compressor outlet 7 increases, overcomes the biasing force of the spring 13, and gradually opens both variable valves 4 and 5 at the same time. Both the air supply pipe 2, which has a small diameter, and the air supply pipe 3, which has a large diameter, are used together, and as shown by the solid line in FIG. 1, the speed fluctuation at the compressor outlet is small, and the difference in the amount of air supplied to each cylinder is also reduced. As described above, in the embodiment, since the absolute value of the air intake speed is high even in the low rotation range, a strong swirl can be obtained and fuel consumption can be reduced.

Note that the transient response of the variable valves 4 and 5 is stably controlled by a microcomputer.

In the exhaust turbo supercharger engine having an intake pipe with a small diameter according to the present invention, an intake pipe with a large diameter is installed, and the intake pipe is connected to a variable valve at the downstream 7 near the compressor and the upstream 14 near the inlet of each cylinder. 4 and 5, and the variable valves are each controlled by the supply pressure at the compressor outlet 7 to
Since the variable valves are configured to be opened or closed in the low rotation range, the speed fluctuation of the air supplied from the compressor is small, and there is little difference in the amount of air supplied to each cylinder, and even in the low rotation range, the speed is isolated. Since the value is high, it is possible to obtain a strong vortex flow, which can reduce fuel consumption.

[Brief explanation of the drawing]

Fig. 1 is a compressor outlet velocity change curve diagram in the low rotation range and high rotation range of the normal air supply pipe device and the air supply pipe device according to the present invention, Fig. 2 is a configuration diagram of the variable air supply pipe device according to the present invention, and Fig. 3 is a diagram. FIG. 2 is a cross-sectional view of FIG. 2; 1...Cylinder, 2...Small diameter air supply pipe, 3...Bypass large diameter air supply pipe, 4, 5...Variable valve, 7...
Compressor outlet, 9... Compressor, 10... Turbo supercharger, 15... Working cylinder.

Claims (1)

[Scope of utility model registration request] A small diameter air supply pipe 2 connecting the compressor 9 of the exhaust turbo supercharger and the engine, and a double structure provided to accommodate the air supply pipe 2, with both ends near the compressor outlet and each cylinder 1 inlet. an air supply pipe 3 having a large cross-sectional area, variable valves 4 and 5 that respectively connect each end of the air supply pipe having a large cross-sectional area and the small-diameter air supply pipe, and an operating cylinder 15 of these variable valves and a compressor. A variable air supply pipe device, comprising a connecting pipe 6 connecting an outlet of the compressor, and in which the variable valves are opened and closed, respectively, in high and low rotational ranges of the compressor.