JPH03118236U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a system diagram of a supercharged engine according to the first embodiment of the present invention, FIG. 2 is a front view of the turbine downstream structure of the main and auxiliary turbochargers in the device of FIG. 1, and FIG. 1 is a cross-sectional view showing the exhaust bypass valve in the closed state, FIG. 4 is a cross-sectional view showing the exhaust bypass valve in the open state in the device shown in FIG. 1, and FIG. 5 is a cross-sectional view showing the exhaust bypass valve in the device shown in FIG. A characteristic diagram showing the relationship between rotation speed and supercharging pressure, Fig. 6 is a flowchart showing the procedure of supercharging control in the device of Fig. 1, and Fig. 7 is a supercharging according to the second embodiment of the present invention. 8 is a schematic system diagram of a conventional supercharged engine, FIG. 9 is a system diagram showing an example of a supercharged engine having an exhaust bypass valve, and FIG. 10 is a system diagram of a conventional supercharged engine. FIG. 11 is a cross-sectional view showing the state of exhaust interference in the device shown in the figure, and FIG. 11 is a cross-sectional view showing an example of a supercharged engine that alleviates exhaust interference. 1...Engine, 2...Surge tank, 3...
Exhaust manifold, 4... Throttle valve, 5... Throttle opening sensor, 6... Intercooler, 7,
82... Main turbocharger, 7a... Turbine of main turbocharger, 8, 83... Sub-turbocharger, 8a... Turbine of sub-turbocharger, 10... Actuator of intake bypass valve,
11...Intake switching valve actuator, 13...
Intake bypass passage, 14... Intake passage (downstream of compressor), 15... Intake passage (upstream of compressor), 16... Actuator of exhaust switching valve, 1
8...Intake switching valve, 24...Air flow meter,
25...First three-way solenoid valve, 26...Second three-way solenoid valve, 27...Third three-way solenoid valve, 28...Fourth three-way solenoid valve, 29...Engine control computer, 30... Intake pipe pressure sensor, 31
...Waste gate valve, 32...Fifth three-way solenoid valve, 33...Intake bypass valve, 38, 88...
...Exhaust bypass valve, 39, 87...Exhaust bypass passage, 44...Exhaust passage on the main turbocharger side, 45...Exhaust passage on the sub-turbocharger side.

Claims (1)

[Scope of utility model registration request] The engine has a main turbocharger and a sub-turbocharger provided in the main body, and communicates the downstream of the turbine outlet of the sub-turbocharger with the exhaust passage downstream of the turbine outlet of the main turbocharger via an exhaust bypass passage; The valve is opened before the exhaust switching valve located downstream of the exhaust bypass valve is opened, and a part of the exhaust gas flowing out from the auxiliary turbocharger is allowed to flow downstream of the turbine outlet of the main turbocharger, thereby increasing the run-up rotation speed of the auxiliary turbocharger. The supercharged engine is equipped with an exhaust bypass valve that increases the exhaust gas flow downstream of the turbine outlet of the main turbocharger, and the exhaust bypass valve is connected to the exhaust bypass passage on the exit side of the exhaust bypass passage, and the exhaust gas flowing out from the exhaust bypass passage flows downstream of the turbine exit of the main turbocharger. A supercharged engine characterized by a valve that can be opened in the direction of gas flow.