JPS6140916Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a load response improvement device for an internal combustion engine with an exhaust turbo supercharger.

Conventional methods for improving the load response of an internal combustion engine equipped with an exhaust turbocharger when a load is applied include injecting high-pressure air into the engine's cylinders. In this case, there is a problem in that the cost of equipment such as a compressor for high-pressure air injection, an air tank, etc. increases, and also, when the load is low, fuel is combusted in a burner installed in the exhaust pipe, etc., to increase the exhaust energy. There is also a system that prepares for when a load is applied, but this has the problem of worsening fuel efficiency at low loads.

Furthermore, there are methods in which water is injected into the engine's exhaust manifold and the volumetric expansion caused by evaporation is used to accelerate the supercharger, and there is also a method in which high-pressure air is injected in front of the blower of the supercharger, but the former method involves injecting water into the cylinder side. In addition, the latter poses a problem in terms of equipment costs for high-pressure air compressors and tanks.

Therefore, the present invention was devised to solve the above-mentioned conventional problems. By vaporizing and rapidly expanding liquefied carbon dioxide using exhaust heat and accelerating the exhaust turbine using this volumetric expansion, the load can be reduced. The purpose is to increase the amount of air at the time of injection and improve load response.

That is, the load response improvement device of the present invention, in an internal combustion engine having an exhaust turbo supercharger, disposes an expansion chamber that faces and communicates with the exhaust turbine just before the inlet of the exhaust turbine of the exhaust turbo supercharger. In the room,
It is constructed by installing an injection nozzle that can inject liquefied carbon dioxide only when the internal combustion engine is loaded.

An embodiment of the present invention will be described below with reference to the drawings. FIG. The figure is a plan sectional view taken along the line A-A in FIG. 1.

Arrow E discharged from the exhaust pipe 1 of the above internal combustion engine
The exhaust gas shown by is introduced into the exhaust turbine 2A of the exhaust turbo supercharger 2, drives the exhaust turbine 2A, and converts the intake air pressurized by a compressor (not shown) installed coaxially with the exhaust turbine 2A into the exhaust turbine 2A. Although it is designed to be introduced into the cylinder of an internal combustion engine, in the present invention, an expansion valve is installed immediately before the inlet of the exhaust pipe 1 to the exhaust turbine 2A, and its jet port 3A faces and communicates with the exhaust turbine 2A side. Room 3
is arranged, and an injection nozzle 4 is installed in this expansion chamber 3.
It is provided with an opening.

An inverted liquefied carbon dioxide cylinder 6 is connected to the injection nozzle 4 via a solenoid valve 5 through a pipe 7, and when the internal combustion engine is loaded, it is immediately sensed by appropriate means and the A control device 8 is provided which opens the solenoid valve 5 only when a load is applied.

In the load response improvement device of the present invention having the above configuration, when the internal combustion engine is loaded, the liquefied carbon dioxide cylinder 6 and the injection nozzle 4 are communicated with each other by the solenoid valve 5, and liquefied carbon dioxide is injected as shown by arrow C. However, this liquefied carbon dioxide absorbs the heat of the wall surface heated by the exhaust gas E of the expansion chamber 3 and rapidly expands.

Since the ejection port 3A of the expansion chamber 3 is provided facing the exhaust turbine 2A side, the expansion flow of vaporized carbon dioxide effectively accelerates the exhaust turbine 2A and has a negative impact on the cylinder side of the internal combustion engine. Never.

Therefore, if the load response improvement device of the present invention is applied to an internal combustion engine with an exhaust turbo supercharger, liquefied carbon dioxide will be vaporized and expanded by the exhaust heat when the engine is loaded, and the volumetric expansion will be used to improve the exhaust gas. It is possible to accelerate the turbine, increase the amount of intake air when a load is applied, and improve load response.

The present invention can be effectively applied mainly to an internal combustion engine with an exhaust turbocharger.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a main part of a load response improvement device for an internal combustion engine with an exhaust turbo supercharger according to an embodiment of the present invention, and FIG. 2 is a plan sectional view taken along the line A--A in FIG. 1. 2... Exhaust turbo supercharger, 2A... Exhaust turbine, 3... Expansion chamber, 4... Injection nozzle, 5... Solenoid valve, 6... Liquefied carbon dioxide cylinder.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine with an exhaust turbocharger,
Immediately before the exhaust turbine inlet of the exhaust turbo supercharger, an expansion chamber is disposed facing each other and communicated with each other, and an injection nozzle capable of injecting liquefied carbon dioxide only when the internal combustion engine is loaded is disposed within the expansion chamber. A load response improvement device for an internal combustion engine equipped with an exhaust turbo supercharger.