JPH04194317A - Supercharged engine - Google Patents

Abstract

PURPOSE:To improve a NOx reduction and fuel-consumption rate as well as to contrive reduction in combustion temperature and improvement in heat loss, by causing a part of low-temperature suction air to be released into an air supply passage extending from an air cleaner through operation of opening a control valve by an electronic control means. CONSTITUTION:By an electronic control means 14, a control valve 9 is operated on the basis of data such as an engine revolution, an engine load and the like and, in a high-revolution and high-load region of a supercharger 1 where the wind amount from a compressor 5 is in sufficient surplus, a part of high-pressure/low-temperature suction air is bypassed into a bypass passage 10 to permit this air to be released from a nozzle 13 into an air supply passage 12. As a result, the high-pressure/low- temperature suction air is expanded within the air supply passage 12 kept at a negative pressure by operation of an air cleaner 11 to lower the temperature of the suction air and reduce the negative pressure (form a refrigeration cycle). By repeating this operation, the temperature of the suction air supplied to an intake manifold 6 is lowered and the combustion temperature also is lowered with the result that heat loss is improved and enhancement in fuel consumption rate as well as reduction in NOx can be improved.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a supercharged engine.

Through a refrigeration cycle using an intercooler.

It relates to a device that lowers intake air temperature, reduces NOx, and improves fuel efficiency.

[Conventional Technique] In a conventional supercharged engine equipped with an intercooler, air introduced from the air cleaner is compressed by the supercharger compressor to a high temperature, cooled by the intercooler, and then sucked into the engine from the intake manifold. is configured to be

Issue 111 to be solved by the invention With the above configuration, the air compressed by the supercharger passes through the intercooler only once, and depending on the engine rotation and load conditions, the intake air temperature may not drop sufficiently. First, as the combustion temperature increases, there remains the problem that heat loss increases, No increases, and fuel efficiency decreases, and this invention is an attempt to improve this problem.

[Means to solve problems]

The present invention provides an engine with a supercharger in which an intercooler is interposed between a compressor of the supercharger and an intake side of the engine. Exhaust gas from a supercharged engine, characterized in that a bypass path is led out through a control valve that is opened and closed by a controller, and the bypass path is communicated with an air supply path between an air cleaner and the compressor through a nozzle. This paper proposes a device for reducing fuel consumption and improving fuel efficiency.

[Effect]

In a device with the above configuration, a control valve is operated based on information such as engine rotation and load to bypass a portion of high-pressure, low-temperature intake air, and to connect the air cleaner to the supercharger compressor. and hereby.

The high-pressure, low-temperature intake air expands in the air supply path where there is a negative pressure caused by the air cleaner, lowering the temperature of the intake air and reducing the negative pressure.

〔Example〕

The present invention will now be described with reference to embodiments shown in the accompanying drawings.

In the figure, 1 is an engine, and 2 is a supercharger that includes a turbine 4 communicating with an exhaust manifold 3 of the engine 1, and a compressor 5 rotationally driven by the turbine 4.

An intercooler 8 is interposed in the middle of the intake pipe 7 leading out from the compressor 5 and reaching the intake manifold 6 of the engine 1. In the present invention, a control valve 9 is inserted between the intercooler 8 and the intake manifold 6.
A bypass path 10 comprising two bypass paths l is introduced.
O is communicated with the air supply path 12 that supplies air from the air cleaner 11 to the compressor 5 through the nozzle 1), and the control valve 9 is controlled by electronic control means (based on information such as engine rotation and load). The opening/closing is controlled by operation commands from the computer 14.

In the apparatus of the present invention having the above configuration, the electronic control means 14 operates the control valve 9 based on information on engine rotation, load, etc., and controls the air volume from the compressor 5 of the high-speed, high-load supercharger l. In a sufficiently surplus area, a portion of the high-pressure, low-temperature intake air is bypassed to the bypass path IO and discharged from the nozzle 1) into the air supply path 12.

As a result, the high-pressure, low-temperature intake air expands in the air supply path 12 where there is negative pressure due to the air cleaner 11.

By repeating this process of lowering the temperature of the intake air and reducing the negative pressure (forming a refrigeration cycle), the temperature of the intake air supplied to the intake manifold 6 decreases, and the combustion temperature decreases. Improved heat loss and reduced NOx
This makes it possible to reduce fuel consumption and improve fuel efficiency.

〔Effect of the invention〕

With the device of the present invention having the above-described configuration, in a region where there is a sufficient amount of supercharging air when the engine is running at high speed and high load, a portion of the low-temperature intake air is removed by the opening operation of the control valve by the electronic control means. By being released into the air supply path from the air cleaner, it is possible to reduce combustion temperature and improve heat loss, thereby reducing NOx and improving fuel efficiency.

[Brief explanation of the drawing]

The accompanying drawing is a configuration diagram of an embodiment of the present invention. In addition, in the figure. 1 Engine 2. Supercharger 5 Compressor 6 Intake manifold 8 Intercooler 9 Control valve 10 Bypass road 11 Air cleaner 12 Air supply path 14 Electronic control means It is.

Claims (1)

[Claims] (1) In a supercharged engine in which an intercooler is interposed between the compressor of the supercharger and the intake side of the engine, control is performed by electronic control means to open and close the intake pipe from the intercooler to the intake manifold of the engine. A supercharged engine characterized in that a bypass passage is led out through a valve, and the bypass passage is communicated with an air supply passage between an air cleaner and the compressor.