JPS6138122A - Engine with turbo-supercharger - Google Patents

Abstract

PURPOSE:To prevent torque shock when a control valve provided on the exhaust passage is in operation by furnishing an air quantity sensing means, a valve opening setting means and an opening control means, and by setting and controlling the opening of the control valve in accordance with the amount of air suction into the engine. CONSTITUTION:This engine E is provided with an exhaust turbine 17 accommodated in a turbine casing 16, a plurality of swirling exhaust passages 9a, 9b connected with the exhaust gas intake of said casing 16, and a control valve 20 which opens and closes one of these exhaust passages 9a, 9b. Here the signals given by a revolving speed sensor 26 and a throttle opening sensor 27 are entered into a control valve opening setting circuit 25, wherein the necessary amount of air suction is calculated, and a control valve degree-of-opening signal is emitted in accordance with the amount of suction air determined. A step motor 21 is put in operation and controlled via a control circuit 23 and an actuator circuit 22, and the degree of opening of the valve 20 is set to the target value indicated by this control valve degree-of-opening signal.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a turbocharged engine.

(Prior art) As this type of engine, for example, Japanese Patent Application Laid-Open No. 58-796
The one disclosed in Publication No. 22 is known. The supercharged engine disclosed in this patent publication includes an exhaust turbine housed in a turbine casing, two parallel swirl exhaust passages connected to an exhaust intake port of the turbine casing, and one of these exhaust passages. A control valve that opens and closes the exhaust passage, and a control device that opens the control valve when the engine speed exceeds a set value, and the supply is supplied through the open exhaust passage. ”
- The intake air is supercharged by rotating the intake air purer using the turbine.

This supercharged engine has the advantage that sufficient supercharging can be obtained over a wide operating range from the low speed range to the high speed range of the engine due to the action of the control valve. This is done simply by 0N-OFF, that is, by simply opening and closing, so it can be changed from ON to OFF, or from ON to OFF.
When changing from F'F to ON, the rotational speed of the turbine suddenly drops, resulting in a drawback of torque shock. This is because if the opening degree of the control valve is small relative to the amount of intake air, the resistance will be large, and if the opening degree of the force control valve is too large, the rotational speed of the turbine will drop, resulting in insufficient supercharging.

(Object of the Invention) In view of the drawbacks of conventional superchargers, it is an object of the present invention to provide a turbocharged engine that does not generate torque shock when controlling a control valve.

(Structure of the Invention) The present invention provides an exhaust turbine housed in a turbine casing, a plurality of parallel vortex exhaust passages connected to an exhaust intake port of the turbine casing, and an exhaust turbine in any one of the plurality of exhaust passages. A control valve is provided in the exhaust passage to open and close the exhaust passage, and the intake air blower is rotated by the turbine driven by the exhaust gas supplied through the open exhaust passage to supercharge the intake air. In such a turbocharged engine, the air N detection means detects the intake air amount of the engine and outputs an air amount signal, and the control valve opening degree calculated in advance based on the intake air amount is stored. , a control valve opening setting means for outputting a control valve opening signal according to the air amount signal, and receiving the control valve opening signal and controlling the opening of the control valve in accordance with the control valve opening signal. The present invention is characterized in that it is provided with a control means for controlling.

(Effects of the Invention) In the turbocharged engine according to the present invention configured as described above, it is possible to prevent insufficient supercharging due to resistance of the turbine before and after switching the opening of the control means, and
Torque shock can be prevented because the turbo rotation speed changes smoothly when the capacity changes.

(Embodiment) Hereinafter, a turbocharged engine according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram of a turbocharged engine according to an embodiment of the present invention.

The engine E includes a cylinder 1, within which a piston 2 is slidably disposed.

A combustion chamber 3 is formed above the piston 2 within the cylinder 1 . An intake hole 4 and an exhaust hole 5 are open in the combustion chamber 3, and the intake hole 4 is provided with an intake valve 6, and the exhaust hole 5 is provided with an exhaust valve 7, respectively. An intake path W&8 is also connected to the intake hole 4, and an exhaust passage 9 is connected to the exhaust hole 5.

A supply air blower 11 of the turbocharger IO is arranged in the middle of the intake passage 8, a slot valve 12 and a surge tank 13 are arranged downstream thereof, and an air flow meter is arranged on the upstream side. 14 and an air cleaner I5 are provided.

On the other hand, a turbine casing 16 is arranged in the upstream exhaust passage 9, and inside this turbine casing 16,
An exhaust turbine 17 of the turbocharger 10 that drives the air supply blower 11 is provided. An exhaust intake port 18 is formed in a part of the turbine casing 16.
The exhaust intake 1'' 1B has first and second vortex exhaust passage portions 9a and 9b formed by dividing the inside of the exhaust passage 9 near the turbine casing 16 in the longitudinal direction by a separator 19. It is connected.

The second vortex exhaust passage section 9b is provided with a control valve 20 that opens and closes this passage section 9b. The opening and closing of this control valve 20 is controlled by a step motor 2, as shown in FIG. 2, and this step motor 21 is connected to an operating circuit 22. This operating circuit 22 is connected to a control valve opening setting circuit 2.5 via a control diagram @23, and this control valve opening setting circuit 25 stores a control map as shown in FIG. ing. This control map is constructed by arranging target control valve opening degrees in a matrix, which are calculated in advance in correspondence with the intake air amount determined based on, for example, the engine speed and the throttle opening degree. Alternatively, the intake air amount may be calculated in the circuit 25 based on the engine speed and the throttle opening, and the calculated intake air amount may be expressed as a control valve opening-intake air amount characteristic as shown in FIG. The control valve opening degree may be determined by referring to a map showing this.

The control valve opening setting circuit 25 includes an engine rotation speed sensor 26 that detects the engine rotation speed and generates an engine rotation speed signal SE, and a throttle sensor that detects the opening degree of the throttle valve 12 and indicates the opening degree. A throttle opening sensor 27 that outputs a degree signal Ss is connected. The setting circuit 24 receives the above-mentioned signals S E and Ss from these sensors 26 and 27, and receives these signals S F and S S
by referring to the map shown in Fig. 3, or by comparing the signal S
The intake air amount is calculated based on F and Ss, and the calculated intake air amount is compared with the map shown in FIG. 4, and a control valve opening signal is output, and the step motor is 21 to set the opening degree of the control valve 20 to the target opening degree indicated by the control valve opening signal.

In addition, 30 shown in Fig. 2 is a cooling water passage, which guides the cooling water cooled by a radiator (not shown) or the cooling water that has circulated inside the engine, so that the step motor is not affected by heat damage caused by exhaust gas. This is what I did.

As explained above, in the turbocharged engine of the present invention, the opening degree of the control valve is set and controlled according to the amount of intake air, so the rotation speed of the turbo changes smoothly when the turbo capacity changes. Therefore, torque shock can be prevented.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a turbocharged engine according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of the turbocharger shown in Fig. 1, and Fig. 3 is a control diagram. FIG. 4 is a diagram showing a control map used to control the opening and closing of the valve. FIG. 4 is a graph showing a modification of the control map. E...engine, 9a, 9b...vortex exhaust passage section, 10...turbo supercharger, 11...
...Air supply blower, 16...Turbine casing, 17...Exhaust turbine, 18...
・Exhaust intake, 2o...Control valve, 22...
...Operating circuit, 23... Control circuit, 24...
. . . Control valve opening setting circuit, 26 . . . Engine rotation speed sensor, 27 . . . Throttle opening sensor. Fig. 5 Fig. 4 Literary χ1 quantity

Claims (1)

[Claims] an exhaust turbine housed in a turbine casing; a plurality of parallel vortex exhaust passages connected to an exhaust intake port of the turbine casing; and an exhaust passage provided in any one of the plurality of exhaust passages; A turbocharged engine equipped with a control valve that opens and closes, and supercharges intake air by rotating an intake blower by the turbine driven by exhaust gas supplied through an open exhaust passage. , an air amount detection means for detecting the intake air amount of the engine and outputting an air amount signal, and a control valve opening degree set in advance based on the intake air amount are stored, and control according to the air amount signal. A control valve opening setting means for outputting a valve opening signal, and a control means for receiving the control valve opening signal and controlling the opening of the control valve in accordance with the control valve opening signal. Features a turbocharged engine.