JPS6335809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for a turbocharged engine.

Originally, in this type of engine, there is a need to control its operation in order to prevent overrun and surging.

The object of the present invention is to obtain a device that meets such requirements, and includes an engine equipped with a turbocharger consisting of a compressor in the intake passage and an exhaust turbine in the exhaust passage, and a turbocharger in the intake passage downstream of the compressor. In the case of a type equipped with a throttle valve located at a first data memory 14 in which the data is stored, and a second data memory 16 in which the relationship between flow rate and intake pressure corresponding to the compressor operation map is programmed.
and a comparator 18 which outputs an output based on the differential value of the flow rate, intake pressure, and intake valve closing speed.When the output signal exceeds a certain value, the control valve is closed, and when the output signal becomes below a certain value, the control valve is closed. The control valve is configured to open and close to the open side to prevent surging.

Embodiments of the present invention will be described with reference to attached drawings.

In the drawings, reference numeral 1 denotes an engine, and the engine 1 is equipped with a turbocharger 6 consisting of a compressor 3 in an intake passage 2 and an exhaust turbine 5 in an exhaust passage 4. The throttle valve 7 is made to intervene.

According to the present invention, a control valve 8 is provided on the inflow side of the compressor 3, and controls the rotation speed of the engine 1, the intake pressure in the intake passage 2 downstream of the compressor 3, and the throttle valve 7. The opening/closing is controlled in response to the opening degree of the opening. In the drawing, 9 indicates the air cleaner on the upstream side. The control circuit is as clearly shown in FIG. 2, for example, and includes a rotation speed sensor 10 for detecting the rotation speed described above, an intake pressure sensor 11 for detecting the intake pressure described above, and an opening degree sensor 11 for detecting the opening degree described above. A sensor 12 is prepared and connected to the input side of an arithmetic circuit 13 via each amplifier 10a, 11a, 12a, and a first output circuit 15 and a second output circuit are connected to the output side via a first data memory 14. A second output circuit 17 is provided via a data memory 16, and a third output circuit 19 is provided via a comparator 18.
Thus, according to the output signals of the respective circuits 15, 17, and 19, the valve 8 is operated on the closing side, in other words, the compressor 3 is controlled to reduce its intake air amount. I did it like that.

To explain further, the first data memory 14 is
This corresponds to the overrun control map of the relationship between the rotation speed and intake pressure shown in the figure, and each output of the rotation speed sensor 10 and intake pressure sensor 11 is connected to each conductor 2.
1 and 22, and when the output relationship exists in region A as shown in the figure, an output is generated in the output circuit 15 to close the control valve 8 as described above, thus preventing overrun. Furthermore, the data memory 16 is
It corresponds to the compressor operation map of the relationship between the flow rate and intake pressure shown in the figure, and shows a flow rate signal as a function of each output of the rotation speed sensor 10, intake pressure sensor 11, and opening sensor 12, and the intake pressure sensor 11. When the relationship between the two is in region B shown in the figure, this is close to the surging region, but in this case, the output circuit 1
An output is generated at 7 and the control valve 8 is closed, thus preventing surging.
Furthermore, the comparator 18 sends the signal corresponding to the area C in FIG. Therefore, when the signal exists in region C and the differential value is relatively large, that is, when the throttle valve 7 suddenly closes, there is a risk of surging, but in this case, the output circuit 19 When an output is obtained, the above-mentioned valve 8 is closed to prevent surging.

In this way, according to the present invention, a control valve is provided on the inflow side of the compressor, and the opening and closing of the control valve is controlled according to the engine speed, intake pressure, and throttle valve opening, thereby preventing overrun and surging. It can be performed relatively easily and reliably, and has the advantage of providing stable operation.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an example of the device of the present invention, Fig. 2 is a circuit diagram of an example of its control circuit, Figs.
The figure is a diagram of each operating characteristic. DESCRIPTION OF SYMBOLS 1...Engine, 2...Intake passage, 3...Compressor, 4...Exhaust passage, 5...Exhaust turbine, 6...Turbo charger, 7...Throttle valve, 8...Control valve, 10...Rotational speed sensor, 11...Intake pressure sensor, 12 ...opening sensor, 14...first data memory, 16...second data memory, 18...comparator.

Claims (1)

[Claims] 1. In an engine equipped with a turbocharger consisting of a compressor in an intake passage and an exhaust turbine in an exhaust passage, and a throttle valve located downstream of the compressor in the intake passage, a control valve is provided on the inflow side of the compressor. a first data memory 14 programmed with an overrun control map that defines the relationship between engine speed and intake pressure on the downstream side of the compressor within a certain value; A programmed second data memory 16 and a comparator 18 that outputs the differential value of the flow rate, intake pressure, and intake valve closing speed control the control valve to close when the output signal exceeds a certain value. A control device for a turbocharged engine, which controls a control valve to open and close when an output signal falls below a certain value to prevent surging.