Engine with double supercharging systems

Abstract

An engine with double supercharging systems comprises an air filter, a first supercharger, a first water-cooling intercooler, a one-way valve, a second supercharger, a second water-cooling intercooler, an engine body and an exhaust manifold, the air filter is connected with the first end of the first supercharger through a pipeline B, and the exhaust manifold is connected with the second end of the first supercharger; and the first end of the first supercharger is further connected with an engine body through a first pipeline, and the first water-cooling intercooler and the second water-cooling intercooler are arranged on the first pipeline. The engine with the double supercharging systems further comprises a second pipeline arranged between the first water-cooling intercooler and the second water-cooling intercooler, the two ends of the second pipeline are connected with the first pipeline, the second supercharger is arranged on the second pipeline, and the one-way valve is arranged on the first pipeline and located between connecting points of the second pipeline and the first pipeline. The problem that a turbo supercharged engine cannot give consideration to low-speed torque and maximum power at the same time can be solved, and meanwhile knocking caused by too high air inlet temperature can be avoided.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to an engine with a double supercharging system. Background technique [0002] Turbocharged engines have the problem of turbo hysteresis during rapid acceleration, and it is difficult for a single first supercharger to balance low-speed torque and high-speed power, and can only exist in a compromised form. The dual supercharging technology allows the first supercharger to take into account more high-speed torque and power, while the low-speed torque and rapid acceleration response are compensated by the second supercharger. [0003] The shortcoming that prior art exists: [0004] 1. A dual supercharging intake system, the second supercharger is arranged upstream of the first supercharger, and the first supercharger is between the second supercharger and the intake manifold, due to the hysteresis effect of the turbine The establishment of boost pressure is hindered, and ...

AI Technical Summary

Problems solved by technology

[0004] 1. A dual supercharging intake system, the second supercharger is arranged upstream of the first supercharger, and the first supercharger is between the second supercharger and the intake manifold, due to the hysteresis effect of the turbine It hinders the establishment of supercharging pressure, and cannot realize the function of quickly establishing supercharging pressure

[0005] 2. Another engine with a low-pressure EGR system and its control method. The second supercharger is arranged after the intercooler. After the second supercharger works, the temperature of the intake manifold increases, which may easily lead to combustion knocking. limit engine performance

[0006] 3. There is also a low-pressure EGR system for a vehicle engine, which uses a combination of a low-pressure EGR system and a dual supercharging system. In the rapid acceleration working condition of the second supercharger, the low-pressure EGR system fails to provide the required EGR amount in time. lead to worsening of combustion

[0007] To sum up, there is an urgent need for a turbocharged engine that can solve the problem of acceleration response of the turbocharged engine and the problem of not being able to balance low-speed torque and high power at the same time, and at the same time avoid the problems of excessively high intake air temperature and large knocking tendency. pressure system engine

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