JPS58152152A - Carburettor attached with turbocharger - Google Patents

Abstract

PURPOSE:To obtain the titled carburettor having a favorable transitory response property matching with the operation of the turbocharger by a method wherein a throttle valve on the secondary side of the double barrel type carburettor is opened and closed in proportion to the negative pressure in an air intake pipe of a turbocharger compressor. CONSTITUTION:The throttle valve 19 on the secondary side of the carburettor is normally closed as it is throttled by a diaphragm thrust spring 25 inserted into a negative pressure chamber 22 and therefore, the engine is operated by the opening and closing of a throttle valve 15 on the primary side of the carburettor through an acclerator operating rod 17. However, when the throttle valve 15 opens wider than a predetermined degree, the engine is operated with suitable load so that the number of revolutions of a turbine 4' increases and the rotation of the compressor is accelerated to increase the quantity of air supplied to the carburettor. At the same time, a diaphragm 21 in a negative pressure operation chamber 13 is actuated to open the throttle valve 19 so as to meet the increase of the quantity of air supplied to the carburettor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbocharged carburetor engine, and more particularly to a turbocharged carburetor engine equipped with a two-barrel carburetor downstream of an air compressor. In a turbocharger-equipped carburetor engine, it is advantageous to install the carburetor downstream of the compressor in order to ensure air-tightness of the air-fuel mixture supply system and improve fuel consumption performance. In order to fully demonstrate the performance of the turbocharger, it is best to use a two-barrel carburetor. However, in the case of a two-barrel carburetor, the secondary 111
If the one-barrel throttle-pulp is opened and closed by negative pressure in the intake manifold, it will not be possible to maintain the function of the original two-barrel carburetor by opening and closing it according to the primary throttle and pulp2. Primary side throttle
Opening of the secondary throttle pulp at a certain opening degree of the pulp is performed by mechanically connecting the downstream throttle pulp and the secondary throttle pulp.

However, in this case, the secondary throttle pulp is forcibly opened and closed according to the opening degree of the primary throttle pulp.
When the engine load is small, the engine speed does not reach the desired speed even if the compressor speed increases, and on the other hand, when the engine load is large, the amount of air supplied exceeds the expected amount and the supply mixture is interrupted. Problems have occurred that impede the transient response performance of the engine, such as causing a state of excess or lean air. The present invention controls the opening and closing of the throttle pulp on the secondary side of a two-barrel carburetor according to the amount of air sent to the carburetor, so as to accurately adapt to the amount of air sent to the turbocharger compressor and the engine load. The object of the present invention is to provide a turbocharger-equipped carburetor engine that opens and closes the next throttle pulp, which will be described below with reference to the drawings.

FIG. 1 is an overall view showing an embodiment of a turbocharger-equipped carburetor engine according to the present invention, in which a turbocharger 2 is a turbine 4 connected to an exhaust manifold 3 of an engine 1, and an air compressor 5 is connected to the turbocharger 2 as in the conventional type. The compressor 5 takes in and compresses outside air through the air cleaner 6, and sends the air to the carburetor 7, where the air-fuel mixture is supplied to the engine. 8 is the intake manifold for engine 1, 9 is the above knee? -1! An intake pipe to the J-f-6 color air compressor 5; 10 is a muffler for the turbine 4; In the carburetor device according to the present invention, a venturi pipe 11 equipped with a nozzle 12 for measuring the intake air velocity is connected to the intake pipe 9, and a negative A pressure actuator 13 is provided, and the negative pressure chamber of the negative pressure actuator 13 is connected to the pentier nozzle 12 of the intake pipe 9. This venturi tube 11
FIG. 2 shows an enlarged cross-sectional view of the carburetor 7 and the carburetor 7.

In FIG. 2, reference numeral 14 denotes a primary side intake cylinder, and its throttle lever 16 is connected to an accelerator operating rod 17. Further, the throttle lever 20 of the secondary intake cylinder 18 and the secondary 11tl throttle pulp 19 is connected to the negative pressure actuator 13 as described above. That is, the negative pressure actuator 13 is connected to the negative pressure chamber 22 by the diaphragm 21.
The operating rod 24 of the throttle lever 20 is attached to the diaphragm 21, and is normally pressed by a diaphragm pressing spring 25 inserted into the negative pressure chamber 22 to The secondary throttle pulp 19 is closed. The negative pressure chamber 22 is connected to the connecting pipe 2
6, it is connected to the nozzle 12 of the charger inserted into the intake pipe 9 mentioned above.

With the above configuration, the primary throttle pulp 15 is opened and closed by accelerator operation, but the secondary throttle pulp 19 is connected to the intake pipe 9 to the compressor 5.
The amount of intake air increases, the air flow velocity inside the Venturi tube 11 exceeds a certain value, and the negative pressure chamber 22 of the negative pressure actuator 13 increases.
When the internal negative pressure exceeds a certain negative pressure, the diaphragm 21 pulls the actuating rod 24 against the pressure spring 25 and opens the secondary throttle pulp 19.

That is, the primary throttle pulp 1 is activated by the accelerator operating rod 17.
5 is opened and closed to operate the engine, but when the opening of the primary throttle pulp 15 exceeds a certain level, the engine operation becomes a corresponding load operation, and the rotation of the turbine 4 increases, increasing the rotation of the compressor. The amount of intake air is increased and therefore the amount of air sent to the carburetor is also increased. Then, the diaphragm 21 of the negative pressure actuator 13 is activated and the secondary throttle pulp 19 is opened, thereby responding to the increase in the amount of air supplied to the carburetor. As described above, according to the present invention, if the turbine output of the turbocharger increases in a turbo vehicle, the opening of the secondary side throttle pulp of the two-barrel carburetor also widens accordingly, and the opening of the throttle pulp increases accordingly. The turbocharger-equipped carburetor engine increases the amount of air-fuel mixture supplied in accordance with the turbine output and has good transient response that matches the operation of the turbocharger.

[Brief explanation of drawings]

Fig. 1 is an overall view showing an embodiment of a turbocharger-equipped carburetor engine according to the present invention, and Fig. 2 shows a venturi pipe section for taking out negative pressure and a two-barrel carburetor section attached to the air compressor. The embodiment is shown in an enlarged cross-sectional view. 1-m-engine, 2-m-turbocharger. 5-m-air compressor. 7--2-barrel carburetor, 9-m-intake pipe. 11-m-Venturi tube, 12----nozzle. 13--Negative pressure actuator, 15--Primary throttle pulp, 19--Secondary throttle pulp, 20--Throttle lever
21-m-diaphragm. 22-m-Negative pressure chamber, 24--Throttle lever operating rod, 25--Diaphragm pressure spring,
26--Series of tubercles

Claims (1)

[Claims] In a turbocharged engine equipped with a two-barrel carburetor downstream of a turbocharger/compressor, the secondary throttle pulp of the two-barrel carburetor is opened and closed in response to the negative pressure in the intake can of the compressor. A carburetor engine with a turbocharger.