Electric-assistance variable nozzle turbocharging system and control method thereof

Abstract

The invention provides an electric-assistance variable nozzle turbocharging system, and belongs to the technical field of turbochargers. The electric-assistance variable nozzle turbocharging system and the control method thereof aim at enabling a motor and a turbine variable nozzle ring to be coordinated through the influences of the motor and the turbine variable nozzle ring on performance of an engine. A diesel engine cylinder is directly connected between a gas inlet branch pipe and an exhaust branch pipe of the system. A gas inlet pipe is connected to the gas inlet branch pipe. An exhaust pipe is connected to the exhaust branch pipe. An intercooler is installed on the gas inlet pipe. An electric-assistance variable nozzle turbocharger is installed at an inlet of the gas inlet pipe and an outlet of the exhaust pipe. According to the electric-assistance variable nozzle turbocharging system and the control method, the high-speed motor is controlled on the basis of the air-fuel ratio of a diesel engine and the state of a storage battery, the gas inflow amount of the cylinder can be effectively and rapidly regulated so as to be matched with the changes of the oil spray amount, coordinated synchronization of oil and gas is achieved, it is ensured that the diesel engine keeps an appropriate air-fuel ratio value under various working conditions, and meanwhile it is ensured that the battery works in a high-efficiency area.

Description

technical field [0001] The invention belongs to the technical field of turbochargers. Background technique [0002] Nowadays, turbocharging technology has been widely used in vehicle diesel engines. It uses the energy of the exhaust gas discharged from the diesel engine to drive the turbine, and drives the coaxial compressor impeller to rotate and compress fresh air, which has become an important means to effectively increase the output power of the engine. Since the operation of the diesel engine has the characteristics of a large range of speed and load changes, and frequent changes in operating conditions, the matching of ordinary turbochargers and diesel engines will have the following problems: First, the turbocharged diesel engine has poor low-speed power. When the diesel engine is running at a low speed, the exhaust gas flow is small and the available energy is insufficient, resulting in a low speed of the supercharger, which cannot provide sufficient boost pressure a...

AI Technical Summary

Problems solved by technology

Since the operation of the diesel engine has the characteristics of a large range of speed and load changes and frequent changes in working conditions, the matching of ordinary turbochargers and diesel engines will have the following problems: First, the low-speed power of the turbocharged diesel engine is poor

The above two patents only proposed corresponding control methods for a certain operating condition of the engine, and did not combine the various states of the motor and the adjustment of the variable nozzle turbocharger to propose a more comprehensive control method for different engine operating conditions

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